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Electro-hydraulic servo braking system with pedal simulator

A pedal simulator, braking system technology, applied in the direction of brake safety system, brake, brake transmission, etc. Satisfy the driver and other problems, and achieve the effect of shortening the braking distance, ensuring safety, and increasing the braking pressure

Pending Publication Date: 2021-06-11
南京经纬达汽车科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the electronic hydraulic braking system on the market is equipped with a brake pedal simulator, and the electronic hydraulic braking system is also equipped with a solenoid valve to realize the active control and adjustment of the hydraulic pressure, and most of the pedal simulators use a spring structure. Or the combined structure of spring and rubber, using the elasticity of the spring to realize the brake pedal feel of the driver's foot, which is quite different from the brake pedal feel of the traditional vacuum booster, without good damping and hysteresis. The degree of recognition of the feeling is low, which does not meet the needs of drivers

Method used

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  • Electro-hydraulic servo braking system with pedal simulator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] As shown in the figure, an electro-hydraulic servo braking system with a pedal simulator of the present invention includes:

[0050] Housing 4, the inside of which is formed with push rod piston cavity 18, cavity 30 and simulator cavity 29;

[0051] The brake pedal 1 is installed on the left side of the housing 4;

[0052] The push mechanism driven by the brake pedal 1 includes a pedal push rod 2 and an electric control push rod 5. The pedal push rod 2 is slidably installed in the push rod piston chamber 18, and the left end of the pedal push rod 2 is connected to the brake pedal. 1 connection, the right end extends into the electric control push rod 5, the electric control push rod 5 is slidably installed in the cavity 30, and a gap is formed between the pedal push rod 2 and the electric control push rod 5;

[0053] The brake mechanism driven by the push mechanism to achieve braking includes a master cylinder jack 6 and a brake master cylinder 8. The left end of the m...

Embodiment 2

[0071] On the basis of Embodiment 1, the electro-hydraulic servo braking system further includes:

[0072] The pedal displacement sensor is used to obtain the displacement signal of the driver stepping on the brake pedal 1;

[0073] The electronic control unit is used to calculate the total braking force required for this braking according to the pedal displacement signal, and then calculate the braking force required by the electro-hydraulic servo braking system according to the state of the motor and battery, and control the electronically controlled push rod through the motor 5 run.

[0074] After the driver steps on the brake pedal 1, the pedal displacement displacement sensor obtains the displacement signal of the brake pedal 1, and sends a running command and the motion stroke of the electric control push rod 5 to the electric control push rod 5 through the electronic control unit to judge the The displacement of the piston of the brake master cylinder 8 of the hydrauli...

Embodiment 3

[0077] On the basis of Embodiment 2, an annular piston is installed on the side of the pedal push rod 2 close to the push rod return spring 3 .

[0078] Furthermore, the hydraulic valve plug 21 is screwed into the hydraulic valve 11 .

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Abstract

The invention discloses an electro-hydraulic servo braking system with a pedal simulator. The electro-hydraulic servo braking system comprises a shell, a brake pedal, a pushing mechanism driven by the brake pedal, a braking mechanism driven by the pushing mechanism to achieve braking, a braking pipeline hydraulic valve actively controlled by the pushing mechanism and a pedal simulator used for simulating the feeling of the brake pedal. The flow direction of brake fluid in the brake pipeline between a push rod piston cavity and a fluid storage tank is adjusted through the hydraulic valve, due to the incompressibility and liquidity of the brake fluid, the brake fluid flows in the push rod piston cavity, a first piston cavity, a second piston cavity and the fluid storage tank through the brake pipeline in the process that a driver steps on or loosens the brake pedal, pedal damping and hysteresis of the brake pedal are simulated, the hydraulic valve is a mechanical valve body, auxiliary electric control equipment does not need to be arranged, when a system fails, the hydraulic valve effectively avoids the situation that the pressure of the brake fluid flowing into a piston cavity of the simulator is reduced, and the incompressibility and the fluidity of the brake fluid are improved.

Description

technical field [0001] The invention belongs to the technical field of automobile braking, in particular to an electro-hydraulic servo braking system with a pedal simulator. Background technique [0002] The braking system is an important part of motor vehicles such as automobiles, and most existing passenger vehicles use hydraulic braking systems. At present, most of the hydraulic braking systems of passenger cars use vacuum boosters, and drivers are accustomed to the brake pedal feel of vacuum boosters. [0003] With the development of the automobile industry, more and more driver assistance (ADAS) functions are applied, and the traditional vacuum booster cannot meet the needs of ADAS for active braking. In recent years, electronic power-assisted braking products have emerged, and the electronic hydraulic braking system (EHB) is developed on the basis of traditional hydraulic brakes. The operating mechanism is an electronic brake pedal instead of the traditional hydrauli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60T13/14B60T13/74B60T8/40B60T7/04B60T17/18
CPCB60T13/147B60T13/745B60T8/409B60T7/042B60T17/18
Inventor 沈建州丁能根邓伟文
Owner 南京经纬达汽车科技有限公司
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