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Abstract
The electromagnetic-mechanical wedge brake system (EMWB) is a new structure designed for brake-by-wire system. This structure is composed of a DC motor, an electromagnet device, two wedges, two friction plates, a rotating rod and a brake disk. The presented EMWB system contains two brake actuators such as electromagnetic brake and motor brake. The EMWB system provides a mechanical backup brake model driven by the DC motor when the electromagnetic brake fails. In the braking relief phase, the maximum torque of the DC motor should meet the requirement of separating the friction plates from the brake disk, so the brake performance of EMWB system is simulated with Matlab/Simulink and optimized under the multi-objective constraints, and the simulation results demonstrate that the mechanical backup brake model can meet the brake requirements both for the front axle and the rear axle. Through the multi-objective optimization, the EMWB system can reach an acceptable brake performance and the DC motor can meet the requirement of relieving braking.
Highlights
In the past several years, researchers have been working in the field of X-by-wire system, which means the traditional mechanical and hydraulic connections between input and actuating subsystems are replaced by electrical wires to transmit the electric signals [1]
The maximum instantaneous torque of DC motor is 110 N · m, so that the instantaneous electric power is the critical part of the performance of electromagnetic-mechanical wedge brake system (EMWB) system
In this paper, a new electromagnetic-mechanical wedge brake system has been proposed. This brake system has solved the problem of the limit for braking torque in conventional brakeby-wire system and it can be used both in the front axle and the rear axle
Summary
In the past several years, researchers have been working in the field of X-by-wire system, which means the traditional mechanical and hydraulic connections between input and actuating subsystems are replaced by electrical wires to transmit the electric signals [1]. Mechanical brake (EMB) or electronic wedge brake (EWB) Both structures replace hydraulic elements with electric and mechanical elements. There is few researches on the mechanical backup brake which is the standby actuator for braking security when the DC motor fails to work. Electromagnetic brake is another neoteric way in electric vehicles to inherit the advantages of BBW system. They didn’t link the two systems together [14] This is the first attempt to combine the electromagnetic brake with the electronic wedge brake based on the numerous literatures about the structure design and control strategy on the electromagnetic brake and motor brake [15]–[18]. THE BRAKE TORQUE OF ELECTROMAGNETIC-MECHANICAL WEDGE BRAKE MODELING Figure 3 shows a representative schematic of the proposed electromagnetic-mechanical wedge brake system on single wheel
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