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Hydraulic power-assisted braking system and control method thereof

A technology of a braking system and a control method, which is applied to the control of the above-mentioned braking system and the field of hydraulic power-assisted braking system, can solve the problems of noise, power consumption and the like, and achieves a compact system structure, fast adjustment response and low cost. Effect

Active Publication Date: 2018-07-06
WUHU BETHEL AUTOMOTIVE SAFETY SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is mainly reflected in two aspects: one is the development of new energy vehicles, such as the development of electric vehicles, so that there is no vacuuming power source for the vacuum booster on the vehicle-the engine, an electronic vacuum pump must be connected externally, and its disadvantage is that it consumes electric energy , the noise is obvious; the second is the development of active safety braking technology, for example, the vehicle can identify the expected danger after being equipped with radar waves or visual sensors, and actively build pressure braking or emergency braking to avoid collisions

Method used

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  • Hydraulic power-assisted braking system and control method thereof
  • Hydraulic power-assisted braking system and control method thereof
  • Hydraulic power-assisted braking system and control method thereof

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specific Embodiment approach

[0125] The pressure sensor 09 transmits the signal to the electronic control unit. The electronic control unit controls the normally open solenoid valve 08 to be energized and closed, which cuts off the communication between the boost source and the leakage chamber, and drives the hydraulic pump 05 and the motor 06 to work at the same time, and the brake hydraulic pressure is often closed The solenoid valve 10 flows into the III cavity of the brake master cylinder 02 and pushes the pedal piston rod 021 forward to achieve boost pressure.

[0126] 7. Figure 15 It is a schematic diagram of the relationship curve between the brake hydraulic pressure P and the pedal stroke S of the hydraulic assist system of the present invention.

[0127] The invention uses the electronic control unit to drive the hydraulic pump 05 and the motor 06 to pressurize the system, and at the same time control the valve opening of the pressure regulating valve 07, adjust the pressure in the system pipeline, to...

Embodiment approach

[0128] 8. The stepped structure of the piston rod of the piston in the master cylinder makes the hydraulic booster system of the present invention need not add a pedal simulation device, and can also achieve a good pedal feel. The specific implementation is:

[0129] The pressure difference formed by the pedal piston rod 021 in the ratio of the piston bore area in the I cavity and III cavity of the brake master cylinder 02 is used as the driver's pedal feel. According to customer needs, a suitable piston-bore diameter ratio can be designed to achieve the required boost ratio.

[0130] 5. Expanded technical scheme of the present invention:

[0131] The above content has fully expressed the working principle and hydraulic circuit of the scheme of the present invention. Based on the scheme, the present invention has been expanded as follows:

[0132] Such as Figure 16 As shown, a high-pressure accumulator 11 is provided at the output end of the hydraulic pump 05, and a normally closed ...

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Abstract

The invention discloses an oil pressure assistance braking system.A braking main cylinder (02) is sequentially provided with a cavity II, a cavity I and a cavity III in the direction from a piston to a piston rod.The cavity III is an oil cavity where the piston rod is located.The cavity I and the cavity II are connected with an MC port of an ABS / ESC unit (C).An electronic control assistance unit (B) is provided with three electromagnetic valves, a pressure sensor and a one-way valve, wherein the electromagnetic valves are a normally-closed pressure regulating valve, a normally-opened electromagnetic valve and a normally-closed electromagnetic valve, and the normally-closed pressure regulating valve is connected with an oil can.By the adoption of the technical scheme, the production cost is reduced, and the size is smaller, which is beneficial for installation and arrangement on a vehicle; pressure can be increased, reduced and regulated fast, the adjusting response is fast, and the response requirement for a motor-hydraulic pump system and the requirement for a motor and ECU power are far lower than that of the scheme in which the motor is required to rotate forward and backward fast.A vacuum booster is omitted, the system is more compact in structure, and the cost of the whole braking system is low.

Description

Technical field [0001] The invention belongs to the technical field of automobile braking systems. More specifically, the present invention relates to hydraulic assisted braking systems. In addition, the present invention also relates to a control method of the above-mentioned brake system. Background technique [0002] The boost of the traditional automobile brake system is to use the vacuum produced by the engine work or the vacuum produced by the electronic vacuum pump to realize the brake pressure boosting in the vacuum booster. Such as Figure 17 As shown, the serial number 4 is the vacuum booster. The driver steps on the brake pedal 6 when braking, and drives the master cylinder 3 through the electronically controlled pressure regulating unit ABS / ESC2 to build pressure on the brake 1 to generate brake fluid pressure; in this process, a vacuum booster is needed to control the pedal The force is scaled up, allowing the driver to achieve a braking force that meets the brakin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60T13/12B60T13/14B60T13/68
CPCB60T13/12B60T13/146B60T13/686
Inventor 袁永彬徐文泉张平平黄先明
Owner WUHU BETHEL AUTOMOTIVE SAFETY SYST
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