Electro-hydraulic braking method with controllable hydraulic pressure of brake wheel cylinder
A brake wheel cylinder, hydraulic brake technology, applied in the direction of brake transmission, brake, transportation and packaging, can solve the problems of waste, complex structure, redundant function and cost, etc., and achieve the effect of simple structure and easy realization.
Pending Publication Date: 2019-01-18
EAST CHINA JIAOTONG UNIVERSITY
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Problems solved by technology
Researchers at home and abroad have begun to develop an electronic hydraulic braking method with this type of hydraulic drive unit. Among them, the Chinese patent with the authorized announcement number CN 104149765B proposes an automotive electronic hydraulic braking method that can realize time-sharing control, which can realize Time-sharing control of each brake wheel cylinder; the Chinese patent application number 201410008401.1 proposes a method and method for controlling the hydraulic pressure of the wheel cylinder in an electronic hydraulic braking method, and uses the principle of time-sharing control to control the electromagnetic valve at each wheel cylinder. Carry out pressure increase and decrease control, but the structure is more complicated
[0004] Due to the introduction of the electronic hydraulic braking method, if the ABS method or the ESC method in the traditional braking method is still used, it will be redundant and wasteful in terms of function and cost
Method used
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Embodiment Construction
[0020] The present invention will be further described below in conjunction with drawings and embodiments.
[0021] figure 1 A schematic diagram of an electronic hydraulic braking method applying the present invention is shown.
[0022] Such as figure 1 As shown, the electronic hydraulic braking method mainly includes: motor controller 1, motor 2, bevel gear pair 3, brake master cylinder 9, gear 11, rack 10, failsafe valve 12, solenoid valve 13, solenoid valve 14 , solenoid valve 15, solenoid valve 16, hydraulic pressure sensor 17, hydraulic pressure sensor 18, hydraulic pressure sensor 19, hydraulic pressure sensor 20, brake pedal 26, pedal displacement sensor 27, secondary master cylinder 28, ECU 29.
[0023] The motor controller 1 controls the output torque of the motor 2, and the output torque of the motor 2 acts on the brake master cylinder push rod 4 through the bevel gear pair 3, gear 11, and rack 10, and then pushes the brake master cylinder 9. Establish correspondi...
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An electro-hydraulic braking method with the controllable hydraulic pressure of a brake wheel cylinder features that pulse width modulation (PWM) technology is adopted to open and close high-speed on-off solenoid valves at each wheel cylinder, and the pressurization, decompression and pressure maintaining control of each wheel cylinder can be carried out respectively. The opening time of the solenoid valve can be controlled by the difference between the target pressure of the brake wheel cylinder and the actual pressure of the brake wheel cylinder and the rate of change of the hydraulic pressure of the brake wheel cylinder. The invention adopts the PWM technology to control the hydraulic pressure of the brake wheel cylinder, which can obtain the wheel cylinder pressure rate control with approximately continuous variation, and can realize the timing control of the switching action of the solenoid valve, and does not occupy other resources of the ECU. The control method does not need pressure feedback, has simple structure and is easy to realize, and can cooperate with regenerative braking method to recover braking energy.
Description
technical field [0001] The invention relates to automobile brake control technology, in particular to an electronic hydraulic brake method with controllable brake wheel cylinder hydraulic pressure. Background technique [0002] A responsive and effective braking method is the guarantee of the active safety of the vehicle. The traditional braking method generally consists of a brake pedal, a vacuum booster, a brake master cylinder, an ABS module, a brake wheel cylinder and necessary brake lines. The whole method is complicated, and the volume is large, and the degree of integration is not high. At the same time, with the popularization of electric vehicles, the drive motor cannot provide the necessary vacuum for the vacuum booster. Therefore, the electronic hydraulic braking method with high integration, sensitive response and small layout volume has broad development prospects. [0003] The electronic hydraulic braking method generally consists of a brake pedal unit, a hy...
Claims
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Patent Timeline
Login to View More IPC IPC(8): B60T8/36B60T13/66B60T13/68B60T13/74
CPCB60T8/363B60T13/662B60T13/686B60T13/745
Inventor 陈齐平刘禹魏佳成吴明明康盛
Owner EAST CHINA JIAOTONG UNIVERSITY