Browse Topic: Drive-by-wire

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Vehicle Propulsion Model Development for Pure Electric Vehicle Using Drive By Wire System2022-01-011903/29/2022
The present work focuses on developing a data-driven forward facing propulsion system model for Chevrolet Bolt 2019 EV vehicle. The model built in the study gives simulated results of the vehicle propulsion system dynamics and latencies when the necessary inputs of the accelerator pedal and brake pedal are known. Vehicle acceleration and braking characteristics are captured and built into the models in the shape of response maps function of vehicle speed and percentage pedal input. With the necessary inputs of APP and BPP, the model predicts the vehicle state in terms of axle torque and speed. The response maps are developed by performing specialized regression testing of the vehicle using New Eagle Drive By Wire system at the American Center of Mobility, (ACM) proving grounds. The model is validated by using track testing data around the ACM proving grounds and using the model to estimate the vehicle speed for various drive cycles containing normal and aggressive drive cycles by
Goyal, Vasu, Dudekula, Ahammad basha, Naber, jeffrey
A Platform for Quick Development, Simulation and Test of Autonomous Driving Vehicles2020-01-071304/14/2020
This paper proposes a platform to conduct rapid development, simulation and test of autonomous driving vehicles. By combining the advantages of rapid prototyping and software development, the proposed platform could automatically generate codes and download them into domain controllers, therefore the efficiency of development process of the core functions of ADAS can be largely improved. The platform is made up of scene simulation, vehicle dynamics simulation software, a rapid prototyping system, a chassis drive-by-wire control and road-load simulation system. Meaningful tasks including key algorithm development, MIL simulations, domain controller based HIL tests and the development of drive-by-wire systems can all be accomplished by the platform. Since that the E/E architecture of vehicles, intra-vehicle communication and physical characteristics of drive-by-wire systems are well considered, the platform ensures that the developed domain controllers can be directly deployed to road
Qiong, Wu, Man, Adm Jiang Jian, Wei, Liang Hua, Bing, Li Wei
Combined Longitudinal and Lateral Control for Automated Lane Guidance of Full Drive-by-Wire Vehicles2015-01-032104/14/2015
This paper presents a simultaneous longitudinal and lateral motion control strategy for a full drive-by-wire autonomous vehicle. A nonlinear model predictive control (NMPC) problem is formulated in which the nonlinear prediction model utilizes a spatial transformation to derive the dynamics of the vehicle about the reference trajectory, which facilitates the acquisition of the tracking errors at varying speeds. A reference speed profile generator is adopted by taking account of the road geometry information, such that the lateral stability is guaranteed and the lane guidance performance is improved. Finally, the nonlinear multi-variable optimization problem is simplified by considering only three motion control efforts, which are strictly confined within a convex set and are readily distributed to the four tires of a full drive-by-wire vehicle. Simulation results demonstrate the capability of the proposed controller to follow the reference trajectory while adjusting the vehicle speed
Song, Pan, Zong, Changfu, Tomizuka, Masayoshi
Model Based System Design of Conceptual Drive-by-Wire ECU Functions for Electric Vehicle Conversion2013-01-042604/08/2013
Development of conceptual drive-by-wire ECU for electric vehicle conversion (EVC) can be designed by means of a low cost and time saving model based process. This is done by employing MATLAB scripted programs to systematically compute the power flow regime of the electric vehicle propulsion and response to dynamic loads. In this particular design, vehicle data and modification of simplified federal urban driving cycle (SFUD) were the two main inputs for driving simulation. As a result, the simulation was capable to predict various EVC characteristics and design parameters, such as driving range, torque-speed characteristics, and motor power usage. Output obtained from simulation were employed as design criteria to set up drive-by-wire software and ECU hardware functions, which are driving modes, torque set point for EVC electric propulsion in all four quadrants. EVC functions also have potential benefits in the improvement of vehicle drivability to suit a driver's individual preference
Ukaew, Ananchai
Guaranteeing Hard Real-Time Requirements of In-Vehicle Multi-hop Communication Over Ethernet2012-01-019304/16/2012
Vehicle manufacturers currently use Ethernet for fast batch transfers when updating software in ECUs in a vehicle. But Ethernet is also planned for real-time traffic as well; in the short term future for streaming of video and audio and potentially in the long term also for Drive-by-wire functions. Ethernet today uses the same frame format as the original Ethernet from the 1970s did but except from that it bears little resemblance to its original form. Ethernet today uses switches and hence the argument often raised against its use for carrying hard real-time traffic - that the shared medium can cause unbounded delay due to collisions - is not applicable today. In addition, normal Ethernet switches today support prioritization of traffic which allows an engineer to assign a high priority to urgent time-critical traffic so that its queuing delay is not affected by lower priority (supposedly less time-critical) traffic. Although the high bit-rate and the ability to control queuing delays
Liu, Meng, Brohne, Lars, Lext, Jonas
Smart Electro-Mechanical Actuation for Drive-by-Wire Applications2004-21-004510/18/2004
This paper will describe the technical capabilities and vehicle design freedom made possible by drive-by-wire powertrain and chassis control systems, using SKF's Smart Electro-Mechanical Actuating Unit (SEMAU) technology. It will describe the advantages to the vehicle users and vehicle manufacturers of integrating electronic controls into the previously mechanically, hydraulically, and pneumatically actuated function and also show how mechatronic solutions can contribute to these advantages. The paper will refer to the FILO, NOVANTA, and GM Hy-wire concept vehicles, which utilize “by-wire” technology, in order to illustrate these advantages.
Brown, Steven, Holweg, Edward
Analysis of a F1 Car Hydraulic Circuit Dynamic Behavior2001-01-116203/05/2001
This paper deals with the study of the dynamic behavior of a F1 car gear selection hydraulic circuit, when involved in different shift transients. In the first part of the paper the actual circuit is described, and the main hypotheses adopted for the numerical modeling of the hydraulic power unit, of the control valves, of hydraulic pipes and of the actuators involved in the gear shift cycles are introduced. Particular attention is devoted to the actuators actual sequences, as applied by the Electronic Control Unit (ECU) to the servo-valves deputed to actuators control. The strategy to define each gear shift cycle in terms of actuators working position in time domain is chosen, using the frequency map of each servo-valve. A numerical vs. experimental comparison of the behavior of the actuators involved in the gear selection (during about 50 ms for an up shifting and 100 ms for a down shifting) is performed, with the target to define the validity limits of the numerical model results
Borghi, M., Milani, M., Piraccini, M., Flandoli, M.
Influencing Dynamic Handling Response with Manipulation of Advanced All Wheel Drive Systems2000-01-346012/04/2000
Trucks and sport utility class vehicles are established as choice of daily transportation in the US. A new breed of vehicles, commonly referred as “crossover vehicles”, based on passenger car derived platforms, are rapidly filling in the ranks between trucks and automobiles. Most of these vehicles are equipped with relatively sophisticated all wheel drive systems. This sophistication is necessary to fulfill the target mission of these vehicles, to provide an automatic and effortless all wheel drive capability while retaining refined on road comfort. Building on some of the existing systems and sensors, and integrating with other vehicle systems such as ABS, traction control and stability control systems, it is possible to enhance handling response by creating a moment along yaw axis. Pitch and roll movements can also be indirectly influenced. Further possibilities and enhancements will be feasible when drive by wire systems and active suspensions will become available. While most of
Okcuoglu, Murat
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