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Fluids
Published in Daniel H. Nichols, Physics for Technology, 2019
Automotive brakes work on a hydraulic system (Figure 8.28). They consist of a master cylinder, which is a reservoir of fluid, and a brake cylinder at each wheel. The master cylinder contains two pistons, one for the front and one for the back brakes. When the brake pedal is pressed, the pressure generated by the master cylinder is transmitted to each wheel cylinder, causing the brake shoes or the calipers to apply a mechanical pressure on the drums or calipers to slow the vehicle down.
Energy recovery based on pedal situation for regenerative braking system of electric vehicle
Published in Vehicle System Dynamics, 2020
Fenzhu Ji, Yong Pan, Yu Zhou, Farong Du, Qi Zhang, Guo Li
As shown in Figure 1, braking pressure provided by master cylinder could be controlled by modulating valve, which is operated by the braking controller command. The disc brakes have been used in front and rear wheels of the studied EV, and the piston diameter of front and rear wheel cylinder is various. Without regard to the hysteresis and nonlinear characteristics of brake in static state, the frictional braking torque has a relationship with the pressure of wheel cylinder as follows [40,41]: where is the friction coefficient of brake disc, is the pressure of wheel cylinder, is initial pressure of wheel cylinder, is piston radius of the wheel cylinder, is the effective friction radius of brake disc, is braking efficiency.
Hydraulic-pressure-following control of an electronic hydraulic brake system based on a fuzzy proportional and integral controller
Published in Engineering Applications of Computational Fluid Mechanics, 2020
Qiping Chen, Hao Shao, Yu Liu, Yuan Xiao, Ning Wang, Qiang Shu
The EHB system comprises the pedal unit, the pressure building unit, the brake execution unit and the control unit. The EHB system working process is described as follows (Yang & Han, 2017). The pedal unit connected with the brake pedal provides the input signal of brake pedal displacement to the control unit. Figure 1 indicates that the pressure building unit is a secondary mechanical transmission mechanism driven by a motor. The brake execution unit contains the brake master cylinder, the brake pipeline and the brake wheel cylinder.
Numerical analysis of hydroplaning behaviour by using a tire–water-film–runway model
Published in International Journal of Pavement Engineering, 2022
Xingyi Zhu, Yafeng Pang, Jian Yang, Hongduo Zhao
Braking causes energy loss in the antilock braking system (ABS) and heat loss due to friction in the ABS wheel cylinder. The braking moment of a tire is defined in Equation (21). where is the rolling diameter of a tire and is the braking force.