Research on the Anti-Disturbance Control Method of Brake-by-Wire Unit for Electric Vehicles

In order to improve the braking performance of electric vehicles, a novel brake-by-wire actuator based on an electro-magnetic linear motor was designed and manufactured. For the purpose of braking force regulation accuracy and high robust performance, the state observer and the anti-disturbance controller were designed in this paper after describing the actuator structure, braking principle, and mathematical model. The simulation and experimental results showed that the brake actuator responded rapidly, since its response time was only 15 ms. Compared to traditional PID (Proportion Integration Differentiation) methods, the controller proposed in this paper is able to regulate the braking force more precisely and has better anti-disturbance performance, thus the braking process can be accurately controlled according to the driver&rsquo s demand. The vehicle simulation results showed that the braking distance and braking time were shortened by 12.19% and 15.54%, respectively compared with those of the conventional anti-lock brake system (ABS) in the same braking conditions. Document type: Articl

Advanced Control and Estimation Concepts, and New Hardware Topologies for Future Mobility

According to the National Research Council, the use of embedded systems throughout society could well overtake previous milestones in the information revolution. Mechatronics is the synergistic combination of electronic, mechanical engineering, controls, software and systems engineering in the design of processes and products. Mechatronic systems put “intelligence” into physical systems. Embedded sensors/actuators/processors are integral parts of mechatronic systems. The implementation of mechatronic systems is consistently on the rise. However, manufacturers are working hard to reduce the implementation cost of these systems while trying avoid compromising product quality. One way of addressing these conflicting objectives is through new automatic control methods, virtual sensing/estimation, and new innovative hardware topologies

Nonlinear Pressure Control for BBW Systems via Dead-Zone and Antiwindup Compensation

International audienceIn the automotive field, brake-by-wire (BBW) systems are electronically regulated actuators, which are capable of applying a desired braking torque to the vehicle's wheel. Specifically, the electrohydraulic technology is the most widely used in commercial vehicles, as it offers a good tradeoff in terms of size, weight, and cost. However, control of BBW actuators in such a configuration is a challenging problem for many reasons, among which the most critical are the dead zone due to the fluid reservoir and the input saturation limits of the electric motor that moves the pump. In this paper, a complete control architecture accounting for this nonlinear behavior is presented, where the main components are a linear controller, a dead-zone compensator, and an antiwindup block, designed in a cascade fashion. With such a configuration, the achieved equilibrium point is guaranteed to be globally asymptotically stable, and the overall system shows to be robust with respect to variations of the position-pressure curve. Simulation and experiments on a production prototype are proposed to show the effectiveness of the proposed strategy