Aerodynamic interaction between vehicles on a roadway can modify the fuel use and greenhouse gas emissions of the vehicle relative to their performance under isolated, uniform-wind conditions. A comprehensive wind-tunnel study was undertaken to examine changes to the aerodynamic drag experienced by vehicles in close proximity, in adjacent lanes. Wind-load measurements were conducted for two general configurations: 15%-scale testing with light-duty-vehicle (LDV) models, and 6.7%-scale testing with a heavy-duty vehicle (HDV) model. For the LDV study, a DrivAer model was tested with a proximate AeroSUV model or an Ahmed model at lateral distances representing 75%, 100%, and 125% of a typical highway lane spacing, and for longitudinal distances up to 2 vehicle lengths forward and back. Commensurate measurements were conducted for the AeroSUV model with the proximate DrivAer or Ahmed model. For the HDV study, a tractor-trailer model was tested with a single or combination of adjacent-lane

McAuliffe, Brian, Barber, Hali

A Methodology to Design the Flow Field of PEM Fuel Cells

2023-01-0495

04/11/2023

Proton Exchange Fuel Cells (PEMFCs) are considered one of the most prominent technologies to decarbonize the transportation sector, with emphasis on long-haul/long-range trucks, off-highway, maritime and railway. The flow field of reactants is dictated by the layout of machined channels in the bipolar plates, and several established designs (e.g., parallel channels, single/multi-pass serpentine) coexist both in research and industry. In this context, the flow behavior at cathode embodies multiple complexities, namely an accurate control of the inlet/outlet humidity for optimal membrane hydration, pressure losses, water removal at high current density, and the limitation of laminar regime. However, a robust methodology is missing to compare and quantify such aspects among the candidate designs, resulting in a variety of configurations in use with no justification of the specific choice. This contrasts with the large operational differences, especially regarding the pressure loss

Corda, Giuseppe, Cucurachi, Antonio, Diana, Martino, Fontanesi, Stefano, D'Adamo, Alessandro

SAE TOMORROW TODAY: One Step Closer To L4 AV Trucking

1338403/09/2023

The most polite driver on the road might soon be an L4 AV truck. Torc Robotics is the first company developing the technology to commercialize fully autonomous semi-trucks in the U.S. for long-haul applications. By running extensive simulations with the best and most experienced truck drivers in the world, Torc's self-driving vehicle software and integration solution is expected to achieve L4 automation by the end of this decade. As an independent subsidiary of Daimler Truck, the Torc system uses an approach called See-Think-Act to calculate the optimal driving decision. By employing veteran truck drivers to reinforce their technology with real world know-how, Torc is truly making the road a safer place. We sat down with Tim Zuercher, VP Engineering - Autonomy at Torc, to discuss the company's mission to reduce highway deaths, enable critical supplies, and help the transportation industry increase fuel economy, uptime, and capacity.

Hineman, Marcie

eAxles gain TRACTION

22TOFHP10_0110/01/2022

OEMs are developing and testing axles with integrated electric powertrains to electrify trucks of all sizes. Development of electrified drivelines is rapidly ramping up at OEMs and Tier 1 suppliers. With a wide variety of vehicles suddenly in need of electrified drivelines capable of matching or surpassing the capabilities of the existing ICE powertrains, suppliers are providing an array of solutions to meet customer needs. For the electrification of light- and medium-duty trucks, one of the technologies rapidly gaining interest is electric axle or eAxle. An eAxle is a traditional axle housing and differential incorporating an electric motor, an inverter and a thermal-management system. Most eAxles also are equipped with a multi-speed transmission for high- and low-torque demands. While the basic concept is similar across the industry, suppliers are taking varying approaches to put these axles on the roads depending on their target vehicle segment, required power output and desired

Wolfe, Matt

EDITORIAL: Hiring talent to meet high-tech demands

22TOFHP10_0410/01/2022

There's always been competition for engineering talent. But with embedded software becoming ever more critical for subsystems in commercial vehicles and off-highway equipment, nowadays that competition is a whole lot stiffer. Aerospace and process-control industries have been the main competitors for embedded and controls talent in the past, according to Dr. Anupam Gangopadhyay, director of controls and software at Navistar. Despite “new frontiers” that are helping to attract and retain engineers, such as autonomous, connected and electric-vehicle technologies, “a lot of the talent that we were hiring in the past are now interested in things like IoT, cloud computing, natural-language processing and social-networking platforms,” he said during a panel session at SAE COMVEC 2022 in Indianapolis.

Gehm, Ryan

Electrification is the future for defense vehicles

22TOFHP10_0310/01/2022

Despite infrastructure challenges, electrified and automated military vehicles will save fuel and lives, said Allison's VP of Defense Programs at SAE COMVEC 2022. The M1 Abrams main battle tank developed for the U.S. Army in the late 1970s remains the best tank in the world, according to Allison Transmission's VP of Defense Programs, but it does have an Achilles' heel: It needs 0.7 gallons (2.65 L) of fuel to travel a mile. “You don't have to be an engineer to know that's a problem,” Dana J.H. Pittard said to a ballroom full of engineers during the opening keynote of the SAE COMVEC 2022 conference in Indianapolis. Pittard is not an engineer, but his remarkable real-world experiences make him eminently qualified for his role at Allison. Before entering the commercial sector in 2015, he served in the United States Army as a major general and retired after 34 years of active duty - with assignments that included leading a tank company in Desert Storm and serving as military aide to the

Gehm, Ryan

Evaluating Class 6 Delivery Truck Fuel Economy and Emissions Using Vehicle System Simulations for Conventional and Hybrid Powertrains and Co Optima Fuel Blends

2022-01-115609/20/2022

The US Department of Energy’s Co-Optimization of Engine and Fuels Initiative (Co-Optima) investigated how unique properties of bio-blendstocks considered within Co-Optima help address emissions challenges with mixing controlled compression ignition (i.e., conventional diesel combustion) and enable advanced compression ignition modes suitable for implementation in a diesel engine. Additionally, the potential synergies of these Co-Optima technologies in hybrid vehicle applications in the medium- and heavy-duty sector was also investigated. In this work, vehicles system were simulated using the Autonomie software tool for quantifying the benefits of Co-Optima engine technologies for medium-duty trucks. A Class 6 delivery truck with a 6.7 L diesel engine was used for simulations over representative real-world and certification drive cycles with four different powertrains to investigate fuel economy, emissions, and well-to-wheel greenhouse gas performance. Comparisons were made between

Vijayagopal, Ram, Curran, Scott, Deter, Dean, Longman, DOUGLAS

Real-Sim Interface: Enabling Multi-resolution Simulation and X-in-the-Loop Development for Connected and Automated Vehicles

12-05-04-002606/27/2022

Connected and automated vehicles (CAVs) can bring safety, mobility, and energy benefits to transportation systems. Ideally, CAV applications would be fully evaluated and validated prior to real-world implementation. However, many technical challenges in both software and hardware hinder the process. To comprehensively evaluate all aspects of CAV applications, an integrated evaluation environment is needed with various simulation tools from different domains. In the current literature, there lacks a well-developed interface to enable multi-resolution simulation of vehicle, traffic, virtual environment, and hardware-in-the-loop (HIL) simulation. In this work, a modular and flexible interface is developed to enable multi-resolution vehicle and traffic co-simulation for CAV applications. This interface is built upon Oak Ridge National Laboratory’s (ORNL’s) Real-Sim approach, can support various simulation tools and real-time X-in-the-loop (XIL) simulations, and is based on network

Shao, Yunli, Deter, Dean, Cook, Adian, Wang, Chieh (Ross), Thompson, Bradley, Perry, Nolan

SAE TOMORROW TODAY: Using AI to Scale Autonomous Vehicles

1322906/03/2022

A driving school for self-driving vehicles? It's here and proving to be a game-changer. Waabi World is the most scalable, highest fidelity, closed-loop simulator for autonomous vehicles. Powered by AI, it's an immersive and reactive environment that can design tests, assess skills, and teach the self-driving "brain" to learn to drive on its own. This technology significantly reduces the need to test drive in the real world resulting in a safer, more affordable solution. When AI trailblazer & CEO Raquel Urtasun founded Waabi, she set out to scale one of the most important technologies of our generation. By taking an AI-first approach, Raquel and her team are unlocking the potential of self-driving technology and accelerating the commercial deployment of autonomous vehicles. And their work is changing the world for the better.

Hineman, Marcie

Vehicle surge reduction technology during towing in parallel HEV pickup trucks

2022-01-073303/29/2022

In order to ensure the comfort of the parallel HEV pickup truck, this report proposes a vehicle surge reduction technology during towing that utilizes a motor and shifting. Hybridization is one of the approaches to reduce fuel consumption toward the realization of carbon neutrality. The parallel HEV is more advantageous to high-load operation such as towing and loading, which are often used in pickup trucks than the series parallel HEV represented by the Toyota Hybrid System. Since the parallel HEV has an engine, motor, torque converter, and transmission connected in series, a vehicle surge may occur when engaging the lockup clutch due to fuel efficiency and drivability needs, as with conventional powertrains. Vehicle surge is a low-frequency vibration phenomenon. In general, the applied force is the torque fluctuation caused by the engine and tires, and the amplification is the driveline torsional first-order resonance, suspension resonance, and cabin resonance. The vibration is more

Okaya, Shingo, Kokaji, Jun, Quinteros, Luis, Hasegawa, Yoshio, Masunaga, Seiji

Multi trucks platooning fuel economy test results with cooperative adaptive cruise control under real-world driving conditions

2022-01-050103/29/2022

The application of cooperative adaptive cruise control (CACC) to heavy-duty trucks known as truck platooning has shown fuel economy improvements over test track ideal driving conditions. However, there are limited test data available to assess the performance of CACC under real-world driving conditions for 3 trucks automation. As part of a U.S. Department of Energy Funding Opportunity Announcement award project, 3 trucks platooning with CACC has been tested under real-world driving conditions and the results are presented in this paper. On-highway testing is done on a route in Indiana representing the operation of long-haul Class 8 trucks in the United States. The road includes low, medium and high grade segments. The impact of road grade variation and traffic on truck platooning is analyzed and some of the issues with this technology are identified for further research and improvements.

Borhan, Hoseinali, Brady, Nathan, YU, Chia-Siung, Fuhs, Karla, Adi, Gayatri, Pattel, Bibin, Lammert, Michael

Conductive Electric Road System for Heavy-duty Truks

2022-01-015603/29/2022

Total CO2 emissions in the world have risen to approximately 37.8 billion tons (FY2016), with the motor vehicle sector accounting for 5.9 billion tons, or 16% of the total. A large portion of that is attributable to cargo vehicles (trucks and buses). To achieve CO2 emissions reduction in this motor vehicle sector to zero, it is necessary to introduce vehicles that are powered only by electric motors and that do not carry fossil fuels; in other words, electric vehicles (EV) and fuel cell vehicles (FCV). At present, however, EVs face a number of major issues. The principal issues are their range, installed battery capacity, and energy replenishment (support for ultra-rapid charging) as well as the installation of infrastructure for it. Given this background, the technology developed here applies conductive charging from the side for heavy-duty trucks on an Electric Road System (ERS). The results from the design, prototype fabrication, and road testing of this technology show that it

Tajima, Takamitsu

Accuracy and Validation of Geotab GPS Fleet Tracking Devices for Medium Duty Trucks

2022-01-016003/29/2022

Fleet management companies have implemented tracking devices in their vehicles that employ Global Positioning Systems (GPS) in near real time for optimizing fuel consumption, determining smart routes, and for monitoring driving behavior. For this purpose, Geotab Inc. has developed the OBD-II connected Geotab GO device. These devices are capable of recording vehicle position and speed data using GPS. The present study seeks to validate and compare Geotab recorded data to reliable reference data collected from a VBOX 3i RTK DGPS for vehicle position and speed for medium duty trucks. Additional data logging characteristics such as LTE connectivity, Geotab’s proprietary curve logging algorithm, near-real-time vehicle data, speed interpolation, and data recording threshold were analyzed. This study considered two Geotab models, the GO8 and GO9. Both devices were connected in parallel using two sets of two-way splitters connected to the test vehicle’s OBD-II port and fixed to the vehicle’s

Morales, Roberto C.

Efficient Trajectory Planning for Tractor-Trailer Vehicles with an Incremental Optimization Solving Algorithm

2022-01-015903/29/2022

A tractor-trailer vehicle (TTV) consists of an actuated tractor attached with several full trailers. Because of its nonlinear and noncompleted constraints, it is a challenging task to avoid collisions for path planner. In this paper, we propose an efficient method to plan an optimal trajectory for TTV to reach the destination without any collision. To deal with the complicated constraints, the trajectory planning problem is formulated as an optimal control problem uniformly, which can be solved by IPM. A novel incremental optimization solving algorithm (IOSA) is proposed to accelerate the optimization process, which makes the number of trailers and the size of obstacles increase asynchronously. Simulation experiments are carried out in two scenarios with static obstacles. Compared with other methods, the results show that the planning method with IOSA outperforms in the efficiency.

Ruan, Xinyao, Yu, Zhuoping, Xiong, Lu, Fu, Zhiqiang, Li, Zhuoren

Demonstration of energy consumption reduction in class 8 trucks using eco-driving algorithm based on on-road testing

2022-01-015703/29/2022

Vehicle to Everything (V2X) communication has enabled on-board access to the information from other vehicles and infrastructure. This information, traditionally used for safety applications, is increasingly being used for improving fuel economy of the vehicles [1, 2, 3, 4, 5]. This work aims at demonstrating energy consumption reduction in heavy/medium duty vehicles using the eco-driving algorithm. The algorithm is enabled by V2X communication and uses data contained in basic safety messages (BSMs) and signal phase and timing (SPaT) to generate an energy-efficient velocity trajectory for the vehicle to follow. A ~25.7 km (16-mi) urban corridor in Bexar County, Texas, was modeled in a microscopic traffic simulation package and calibrated to match real-world conditions. For the trucks using this algorithm, a nominal reduction of 7% in energy consumption and 6% in trip time was observed in simulation. This was validated by on-track testing of a pair of velocity profiles. The track testing

Bhagdikar, Piyush, Gankov, Stanislav, Frazier, Cole, Rengarajan, Sankar, Warden, Rebecca, Brown, Michael, Sarlashkar, Jayant

Transient car aerodynamics during an overtaking maneuver: a wind-tunnel flow simulation study

2022-01-107503/29/2022

An overtaking process realized in a wind tunnel, implying a BMW car model passing a correspondingly designed truck model (with both vehicles being down-scaled according to 1:2.5), has been investigated computationally by applying the PANS (Partially-averaged Navier-Stokes) approach representing a scale-resolving hybrid RANS/LES (Reynolds-averaged Navier-Stokes / Large-eddy Simulation) model (Basara et al.; AIAA Journal 42(12), 2011). A complementary study including the flow past an isolated BMW car model has been preliminary performed. The characteristic car-relevant flow Reynolds number, based on the axis-center distance and air velocity (of 140 km/h) corresponds to 3 million. The present overtaking maneuver, referred to as a “quasi-stationary” sequence, has been realized by considering eight distinct positions the car model takes relative to the truck configuration. Accordingly, a complete overtaking event accounting for the car positions corresponding to the car approaching the

Kutej, Lukas, Basara, Branislav, Tropea, Cameron, Hussong, Jeanette, Jakirlic, Suad

A Multi-axle and Multi-Type Truck Classification Model for Dynamic Load Recognition

2022-01-015803/29/2022

Overloading of trucks can easily cause damage to roads, bridges and other transportation facilities, and accelerate the fatigue loss of the vehicles themselves, and accidents are prone to occur under overload conditions.In recent years, various countries have formulated a series of management methods and governance measures for truck overloading.However, the detection method for overload behavior is not efficient and accurate enough.At present, the method of dynamic load identification is not perfect. No matter whether it is the dynamic weight measurement method of reconstructing the road surface or the non-contact dynamic weight measurement method, little attention is paid to the difference of different vehicles.Especially for different vehicles, there should be different load limits, and the current devices are not smart enough.Therefore, this paper hopes to design an image processing algorithm to automatically classify different types of trucks, and then calculate the actual load of

Qi, Fei

Rule-based Power Management Strategy of Electric-Hydraulic Hybrid Vehicles: Case Study of A Class 8 Heavy-Duty Truck

2022-01-090103/29/2022

Mobility in the automotive and transportation sector has been experiencing a period of unprecedented evolution. A growing need for efficient, clean and safe mobility has made a strong momentum toward sustainable technologies in this sector. Toward this end, battery electric vehicles have drawn keen interest and the market share is expected to grow significantly in the coming years, especially in light-duty applications such as passenger cars. Although battery electric vehicles feature high performance and zero emissions characteristics, economic and technical issues such as high battery cost, a short driving range, and limited infrastructure should be tackled. In particular, the low power density of battery electric vehicles limits their broad adoption in heavy-duty applications such as class 8 long haul trucks due to a size and weight of battery. In this work, motivated by the high power density and potential for improving energy efficiency through regenerative braking of a hydraulic

Yoon, Yongsoon, Romero, Giovanni, Nkemdilim-Dantzler, Emil, DelVescovo, Dan, Guessous, Laila

Optimization of the operating conditions of a dual CI engine fueled with methanol

2022-01-056003/29/2022

Among the new low temperature combustion modes, Reactivity-Controlled Compression Ignition (RCCI) offers a low NOx-soot trade off (keeping a relatively high engine efficiency). Also, RCCI permits the introduction of a renewable fuel with a lower CO2 direct emission such as short-chains alcohols. For this work, methanol and diesel fuel were used as low and high reactivity fuels, respectively. A 1.3 L single-cylinder engine, with a cylinder volume usual in medium- and heavy-duty truck and bus engines, was used in this work. The engine was operated at an engine speed of 1600 rpm and 25% load (representing one of the 13-mode test on medium duty trucks), which results in an indicated mean effective pressure of 5.2 bar. The effects of methanol substitution ratio (MSR) at 20 and 35% on performance and pollutant emissions was investigated and compared to conventional diesel combustion (CDC). The main target of the work is to find an optimum point according to a defined objective function for

Rodriguez-Fernandez, José, Hernandez, Juan J., Ramos, Ángel, Barba, Javier, Domínguez Pérez, Víctor M., Horcajada Torres, Óscar, Casero-Alonso, Víctor, Rodríguez-Aragón, Licesio J.

Design and Simulation of active anti-rollovers control system for heavy trucks

2022-01-110503/29/2022

With the rapid development of the logistics and transportation industry, heavy-duty trucks play an increasingly important role in social life. However, due to the characteristics of large cargo loads, high centroid and relatively narrow wheelbase, the driving stability of heavy trucks are poor, and it is easy to cause rollaway and accidents under high-speed driving conditions, large steering and emergency obstacle avoidance. To improve the roll stability of heavy trucks, it is necessary to design an active anti-rollover control system, through the analysis of the yaw rate and the load transfer rate of the vehicle tires, driving states can be estimated during the driving process. Under the intervention of the control system, the lateral transfer rate of heavy trucks can be reduced to correct the driving posture of the vehicle body and reduce the possibility of rollover accidents. At present, anti-rollover control systems mainly include semi/active suspension, active steering, and

Zeng, Qingyu

Study and Analysis of External Drag Reduction Methods for Tractor-Trailer Trucks using 3D CFD

2022-01-109303/29/2022

Heavy vehicles play a huge role in the national economy of a country and are responsible for the transportation of a major portion of goods across the terrain. In the United States alone, over 85% of the total value of goods are transported with the help of heavy vehicles. Despite the heavy reliance, these vehicles are not fuel-efficient and more than 40% of the engine’s power production is utilized in overcoming the vehicle aerodynamic drag at highway speeds. The present work explores drag reduction methods that could be used as an external aid for cargo trailer trucks. The paper focuses on 3D CFD analysis of different boat-tail designs that could be used to reduce aerodynamic drag on trailers. The boat tails analysed has been optimised in coherence with standard legal norms for European and US highways. It has been found and established that a truncated boat tail works as a better drag reduction measure than a full or completely inflated boat tail. The commercial code of Simerics MP

Varshney, Anchal, Khandagale, Vitthal, Saha, Rohit

Performance of Virtual Torque Sensor for Heavy Duty Truck Applications

2022-01-075403/29/2022

Automotive Companies are constantly looking to increase the fuel efficiency, shift quality, passenger comfort, and to reduce wear and tear on the components. Torque is one of the parameters that is estimated using SAE J-1939 CAN bus algorithm. This estimated torque is used for transmission control and to determine the required operational gear position at a given speed and road conditions. Currently, SAE J-1939 CAN bus torque estimation relies on steady state maps that are generated during the calibration of engine for different speeds and loads. The accuracy of the estimated torque is affected by the transient events like hill climbing, changing on-road traffic situations etc. which results in poor shift control causing higher fuel consumption. In this paper we report the development of a Virtual Torque Sensor (VTS) useful for real time torque measurement based on the engine harmonics analysis. The VTS uses the signal from the flywheel speed sensor to estimate the nth order flywheel

Iddum, Vivek, Chahal, Iqbal Singh, Bair, John, Ghantasala, Muralidhar K.

Enhanced SAE 3 link Leaf Spring Model to Generate Durability Virtual Loads

2022-01-034003/29/2022

Heavy-duty truck vehicles are generally equipped with leaf spring suspensions. Conventionally, beam elements are used in multibody software to build the leaf spring model to calculate virtual loads. Beam elements require a high computation time due to their numerous degrees of freedoms and force components introduced by beam connections, interleaf contacts, friction, etc. Again, in these simulations, solvers frequently fail in durability loads analysis due to sudden spike in accelerations, high suspension articulation coming from severe road profiles. These drawbacks lead to the use of simplified three-link mechanism models to simulate the leaf spring’s behavior, which is computationally faster. However, the current approach is less accurate as compared to the beam element model because this model has only a torsional spring which accounts for vehicle bounce condition. In reality, the leaf spring suspension system is also subjected to cornering and braking while running on road

Dixit, Navnit, Venkatesan, Dhanasekar, Pardeshi, Ravasaheb

Steering Control Systems - Heavy Trucks

J2425_202111 (Current)

11/09/2021

This SAE Recommended Practice describes a laboratory test procedure and requirements for evaluating the characteristics of heavy-truck steering control systems under simulated driver impact conditions, as well as driver entry/egress conditions. The test procedure employs a torso-shaped body block that is impacted against the steering wheel.

Truck Crashworthiness Committee

Driveline Parking Brake Test Procedure for Medium Duty Vehicles

J2690_202110 (Current)

10/28/2021

This SAE Recommended Practice establishes uniform test procedures for friction based parking brake components used in conjunction with hydraulic service braked vehicles with a gross vehicle weight rating greater than 4500 kg (10 000 lb). The components covered in this document are the primary actuation and the foundation park brake. Various peripheral devices such as application dashboard switches or indicators are not included. These test procedures include the following: a Brake Related Tests 1 Brake Functional Performance 2 Brake Dynamic Torque Performance 3 Brake Corrosion Resistance 4 Brake Endurance with Torque 5 Brake Endurance without Torque 6 Vibration Resistance 7 Brake Ultimate Static Load 8 Brake Lining Wear Adjuster Function b Actuation Related Tests 1 Mechanical Actuator Functional Performance 2 Mechanical Actuator Endurance 3 Mechanical Actuator Quick Release 4 Mechanical Actuator Ultimate Load 5 Spring Apply Actuator Functional Performance 6 Spring Apply Actuator

Truck and Bus Hydraulic Brake Committee

J1939 Digital Annex

J1939DA_202110 (Historical)10/21/2021

This document is intended to supplement the J1939 documents by offering the J1939 information in a form that can be sorted and search for easier use.

Truck Bus Control and Communications Network Committee

Divergence of Thickness Losses and Weight Losses of Disc Pads for Passenger Cars: High-Copper NAOs and Copper-Free Low Mets

2021-01-129010/11/2021

The current investigation was undertaken to find out if lighter-weight passenger car disc pads would exhibit wear behaviors similar to pickup truck pads and commercial heavy truck drum linings in terms of the permanent volume expansion of the friction material contact surface region. 2 high-copper Non-Asbestos Organic formulations and 3 copper-free Low-Met formulations were tested according to the SAE J2522 test procedure. In all cases, the measured pad thickness loss was found to be less than the thickness loss calculated from the weight loss, indicating pad volume expansion, in full agreement with the results from the pickup truck and heavy trucks. One needs to consider pad property changes associated with the volume expansion if good correlations are to be found between pad properties and brake friction, wear and NVH.

Rathee, Aman, Singh, Shiv Raj, Sharma, Devendra, Rhee, Seong Kwan

FEA based approach for Heavy Duty Commercial Vehicles Lift Axle Weld Analysis and Physically Correlated

2021-26-031609/22/2021

Highway transportation using truck is an important transport mode of goods and product to their destination. Commercial vehicle is expensive mode of transportation so it will be protected from failure. For Heavy duty truck they are fully loaded at one side of transportation and other side empty transportation. In such case lift axle using (Pusher axle if lift axle is added front of drive axle and Tag axle when it installed after drive axle) when truck is loaded and when truck is empty it is in lift condition. Lift axle is play important role while loading so it is important that it should not fail. Many times lift axle fails at weld location due several load come on the axle. In this paper study of weld failure due several loading come on lift axle when truck is in loading condition. Load come on lift axle are Braking load, Vertical load, lateral load and Clutch drop test loading. Weld failure check in CAE analysis with various load cases and compare with actual physical vehicle

Kandreegula, Suresh Kumar, Jadhav, Santosh, Nishad, Hemant, H A, Mithun

Customer-Centric Subjective Vehicle Evaluation by Assigning Weights to Attribute Parameters using Analytic Hierarchy Process

2021-26-049209/22/2021

Subjective vehicle evaluation is a critical and established method to validate, engineer, and refine vehicle attributes. Organizations have an array of products catering to different customer requirements and expectations. To achieve better customer centricity and focused vehicle product attribute targets, weightage factoring of its corresponding parameters is essential. Subjective evaluations by vehicle evaluators comprise of providing ratings and feedback about attributes during different development stages of the product. All attribute parameters are presumed to have equal significance to the end customer. At times the end customers have different preferences for different vehicle attribute parameters. The objective of this paper is to demonstrate the use of the Analytic Hierarchy Process (AHP) to obtain the weightage factors for attribute parameters. Conventional method to obtain an overall attribute subjective rating is a simple mathematical average of the parameter ratings. The

Jayakumar, Gautham, Mahajan, Pushkar

Integration of Clutch Housing and Transmission Housing in Light-Duty Trucks for Powertrain Downsizing using Simulation Tools and Experimentally Validated

2021-26-037609/22/2021

Downsizing and Light weighting is the latest trend in the automotive industry to achieve more fuel efficient, compact and cost effective design of vehicles. Powertrain components compromise of more than 45% of the total vehicle weight. We have identified the gear box housings for downsizing in light duty trucks i.e. Existing light duty trucks Cast Iron transmission. This design has been successfully modified with integrated clutch housing and transmission housing, using lightweight aluminum as the new material, using simulation tools. This lead to weight savings of up to 30% and cost savings of 20-25% as compared to existing cast iron designs. Using an integrated design reduces the assembly cost, makes the design more compact and gives better weight balance. From an emissions perspective, it is estimated that every 50 Kg of weight reduced from an average 1,500 Kg vehicle cuts CO2 emissions by 4 ~ 5 grams. This feat is achieved using simulation tools and experimental verification in

Tripathi, Naveen, Kandreegula, Suresh Kumar, Agrawal, Sachin

Aero drag improvement study on large commercial vehicles using CFD lead approach

2021-26-042409/22/2021

Nowadays, E- commerce and logistics business model is booming in India with road transport as a major mode of delivery system using containers. As competition in such business are on rise, different ways of improving profit margins are been continuously evolved. One such scenario is to look at reducing transportation cost while reducing fuel consumption. Traditionally, aero dynamics of commercial vehicles have never been in focus during their product development although literature shows major part of total fuel energy is consumed in overcoming aerodynamic drag at and above 60 kmph in case of large commercial vehicle. Hence improving vehicle exterior aerodynamic performance gives opportunity to reduce fuel consumption and thereby business profitability. Also byproduct of this improvement is reduced emissions and meeting regulatory requirements. To bring this into reality, vehicle manufacturers are looking at different opportunities to reduce aero drag and one such method that are been

ANWAR, FAISAL, Gulavani, Rohan Arun, Chalipat, Sujit, Jadhav, Satish

On-Highway Equipment Control and Communication Network

J1939/1_202109 (Current)09/21/2021

Truck Bus Control and Communications Network Committee

J1939 Digital Annex

J1939DA_202108 (Historical)08/05/2021

This document is intended to supplement the J1939 documents by offering the J1939 information in a form that can be sorted and search for easier use.

Truck Bus Control and Communications Network Committee

SAE TOMORROW TODAY: Soaking Up the Sun: America's First Solar-Powered Town

1315607/29/2021

Welcome to Babcock Ranch: the hometown of the future. Powered entirely by 700,000 solar panels across 840 acres of land in sunny Florida, Babcock Ranch is an innovative town that combines everything Americana with the technologies of tomorrow: electric-powered ice cream trucks, city-wide WiFi, expansive public green spaces, and the comfort of being part of a community. Syd Kitson, Chairman and CEO of Kitson & Partners - the founders of Babcock Ranch - joined us to share how he turned his vision for the future into reality - while making it economically viable along the way.

Hineman, Marcie

Diesel in distress

SAE-MA-0465606/10/2021

The global chip shortage undercuts surging demand for Cummins’ diesel engines in markets that have rebounded rapidly from 2020’s low point.

Gehm, Ryan

SAE TOMORROW TODAY: The Goodyear Tire & Rubber Company Rolls Forward with the Future of Mobility

1301305/04/2021

Not just your grandfather's tire company, Goodyear is now shaping how people move in the future. On this episode, Erin Spring, Senior Director, New Ventures at The Goodyear Tire & Rubber Company, shares how the company is leading the way in predictive vehicle servicing to keep car and trucks safer, serviced and ready to GO!

Hineman, Marcie

Disc Wheel and Hub or Drum Interface Dimensions - Truck and Bus

J694_202104 (Current)

04/30/2021

This SAE Recommended Practice contains dimensions and their tolerances concerning disc wheel to hub or drum interface areas for truck and bus applications. Disc wheels designed only for single wheel applications (not dual wheels) for light trucks and special or less common applications are not covered in this document.

Truck and Bus Wheel Committee

Items per page:

1 – 50 of 2985