Automated vehicles, in the form we see today, started off-road. Ideas, technologies, and engineers came from agriculture, aerospace, and other off-road domains. While there are cases when only on-road experience will provide the necessary learning to advance automated driving systems, there is much relevant activity in off-road domains that receives less attention. Implications of Off-road Automation for On-road Automated Driving Systems argues that one way to accelerate on-road ADS development is to look at similar experiences off-road. There are plenty of people who see this connection, but there is no formalized system for exchanging knowledge. Click here to access the full SAE EDGETM Research Report portfolio.

Assisted Steering Control for Distributed Drive Electric Vehicles Based on Combination of Driving and Braking

2023-01-701210/30/2023

This paper presents a low-speed assisted steering control approach for distributed drive electric vehicles. When the vehicle is driven at low speed, the braking of the inner-rear wheel is combined with differential drive to reduce the turning radius. A hierarchical control structure has been designed to achieve comprehensive control. The upper-level controller tracks the expected yaw rate and vehicle side-slip angle through a Linear Quadratic Regulator (LQR) algorithm. The desired yaw rate and vehicle side-slip angle are obtained according to the reference vehicle model, which can be regulated by the driver through the accelerator pedal. The lower-level controller uses a quadratic programming algorithm to distribute the yaw moment and driving moment to each wheel, aiming to minimize tire load rate variance. Simulation and real vehicle tests compare three steering modes: front-wheel steering only, front-wheel steering + differential drive assisted steering, and front-wheel steering

Wu, Dongmei, Wang, Cheng, Du, Changqing, Zhang, Yichao

Optimization of Energy Management Strategy for Multi-Mode Hybrid Transmission Based on Condition Prediction

2023-01-703210/30/2023

Since there are no typical working conditions in the field of engineering vehicles, this paper implements the construction of driving conditions based on Markov stochastic model and energy management strategy of a multi-mode hybrid mine dump truck based on dynamic programming algorithm under this background. Firstly, on the basis of existing vehicle driving data, we calculate the velocity transfer probability matrix with the Markov stochastic model, and then construct the vehicle driving condition after predicting the velocity. The constructed working conditions are applied to the energy management strategy of dynamic programming algorithm to calculate the energy consumption of the hybrid mining truck. It is proved that this construction method can be applied to the hybrid electric mine dump truck, and the DP based energy management strategy has lower energy consumption.

Jiang, Y.T., Zhao, Xinxin, Zhang, J.G.

Prediction and Optimization of Noise radiation from a Heavy-Duty Commercial Vehicle Transmission using Statistical Energy Analysis

2025-01-005105/05/2023

Heavy Duty (HD) linehaul vehicles are majorly used in transportation of goods and heavy loads between different cities or long distances. Considering the current trend, payload capacity of these heavy-duty trucks are increasing due to constant increase in the load demand. Due to which engine torques of these HD vehicles are increasing which in turn increases the transmission input torque. At higher torque levels, gear excitation also increases and transmission becomes more susceptible towards higher noise radiation. Global vehicle pass-by noise regulations for HD commercial vehicles are becoming more stringent. Historically transmissions have been considered a secondary noise source but with overall HD vehicle noise becoming quieter, the transmission can be more of a significant noise contributor. Hence, noise radiation from the transmission is also an important factor to be considered in the design phase. Gear whine is the major concern for sound radiation from the transmission. The

Rastogi, Sarthak, Milind, T. R.

Interior Noise Reduction of Construction Equipment Vehicle Through Structure-borne Noise Reduction Strategy

2025-01-006305/05/2023

One can witness the constant development and redevelopment of cities throughout the world. Construction equipment vehicles (CEVs) are commonly used on the construction site. However, the noise pollution from construction sites due to the use of CEV has become a major problem for many cities. The construction equipment employed is one of the main causes of these elevated noise levels. The construction workers possibly are face a potential risk to their auditory health and well-being due to the noise levels they are exposed to. Different countries have imposed exterior and operator noise limits for construction equipment vehicles, enabling them to control noise pollution from CEVs. In this study, the operator ear level noise of the identified vehicle is 6 dB(A) higher than the regulatory limit in dynamic conditions, when tested as per ISO 6396. It was a tough time for the NVH engineer to reduce the interior noise level of the vehicle. Surprisingly, the steering unit and radiator fan were

Jawale, Pradeep

Impact of torsional vibrations on the strength of clutch dampers.

2025-01-009905/05/2023

The clutch is a mechanical device that engages and disengages power transmission from the engine to the wheels. The damper mechanism integrated into the clutch disc is designed to attenuate the torsional vibrations from the engine. This study investigates the impact of torsional vibrations on the structural durability of a clutch disc damper of the intermediate and light commercial vehicle. The baseline clutch damper's springs experienced excessive deflection angles due to driveline resonance experienced in operation, resulting in the springs hitting the contact surface. This caused the springs to fail due to the high stresses created during operation. A 1D simulation model is utilized to predict the torsional vibration behavior of the vehicle. The driveline's 1D model is created using Amesim software, and the simulated results demonstrate a strong correlation with the actual torsional measurements taken at the vehicle level for the baseline clutch damper. A new clutch damper design

Jagtap, Amol Shivaji, Chollangi, Damodar, PACHPANDE, PRASHANT

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: Sustainable Rubber Hits the Road

1337902/03/2023

When the rubber hits the road, one tire company stands out among the rest. From raw material traceability to supply chain transparency, Goodyear Tire & Rubber Company is not only helping to do what's good for business, but what's good for the planet, too. Driven by an ambitious sustainability strategy, Goodyear has set goals to develop a tire made of 100% sustainable materials by 2030 and using only renewable energy in its manufacturing facilities and operations by 2040. The company is even working to develop a domestic source of natural rubber from a specific species of dandelion in collaboration with the Department of Defense, the Air Force Research Lab, BioMADE and Farmed Materials. To learn more about Goodyear's impressive sustainability journey, we sat down with Ellis Jones, Vice President and Chief Sustainability Officer. He discusses the company's uniquely strong culture, the importance of working collaboratively with small farms, and the development of new sustainable tire

Hineman, Marcie

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