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Pressure control method for decoupled electronic hydraulic brake system

A technology of hydraulic braking and system pressure, which is applied in the direction of brakes, brake transmissions, transportation and packaging, etc. It can solve the problems of drivers' psychological panic, excessive deceleration fluctuations, and frequent nodding of the vehicle, so as to improve safety , increase the supercharging speed, and shorten the braking distance of the car

Inactive Publication Date: 2019-01-11
SOUTH CHINA UNIV OF TECH
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

Because of the excessive pressure overshoot during the braking process, the deceleration fluctuation will be too large, which will cause frequent nodding of the vehicle, which will easily cause the driver's psychological panic

Method used

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  • Pressure control method for decoupled electronic hydraulic brake system
  • Pressure control method for decoupled electronic hydraulic brake system
  • Pressure control method for decoupled electronic hydraulic brake system

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Embodiment Construction

[0042] In order to make the object, technical solution and advantages of the present invention more clear and definite, the present invention will be further described in detail with reference to the accompanying drawings and examples.

[0043] A pressure control method for a decoupled electronic hydraulic braking system, comprising the following steps:

[0044] (1) Calculate the pressure dead zone of the decoupled electronic hydraulic braking system: use the brake system bench test to test the working gap between the wheel cylinder friction pad and the brake disc of the decoupled electronic hydraulic braking system x w0 =0.1mm, the area A of the wheel cylinder piston w =8.04×10 -4 mm 2 , the piston area A of the servo master cylinder s =4.5×10 -4 ;according to the formula x' s0 =x w0 A w / A s =0.18mm, calculate the servo master cylinder pressure dead zone caused by the working gap between the wheel cylinder friction pad and the brake disc; measure the dead zone range ...

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Abstract

The invention discloses a pressure control method for a decoupled electronic hydraulic brake system, comprising the following steps: calculating a pressure dead zone of the decoupling electronic hydraulic brake system; establishing a system state space equation of the decoupling electronic hydraulic brake system when a servo master cylinder piston is in the range of pressure dead zone; establishing a system state space equation of the decoupling electronic hydraulic brake system when the servo master cylinder piston is in the pressurized range; designing a controller of the servo master cylinder piston in the range of pressure dead zone and non-pressure dead zone; using the saturation function to replace the sign function; and adjusting related control parameters. The pressure control method for a decoupled electronic hydraulic brake system has the following positive effects: 1) the pressure response time of the decoupling electronic hydraulic brake system is effectively reduced so asto improve the braking safety of a vehicle; and 2) the pressure overshoot and the pressure fluctuation of the decoupling electronic hydraulic brake system are effectively reduced so as to improve thebraking comfort of the vehicle.

Description

technical field [0001] The invention relates to a pressure control method of a decoupled electronic hydraulic braking system, which belongs to the technical field of automobile braking systems. Background technique [0002] With the weight reduction of automobiles, automobile braking systems are also developing towards high integration. The service brake of a traditional braking system usually consists of a brake pedal, a vacuum booster pump, a brake master cylinder ABS / ESP brake wheel cylinder and corresponding pipelines. The whole system is relatively complicated, and has a large weight and volume. And because the power source of the traditional car braking system is the vacuum booster pump, the power source is the pressure difference between the intake manifold of the car engine and the atmospheric pressure, while the electric car does not have an engine, and the engine of the hybrid car works intermittently, so Conventional braking systems are not suitable for EVs and ...

Claims

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Application Information

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IPC IPC(8): B60T13/66B60T13/74
CPCB60T13/662B60T13/745
Inventor 上官文斌梁土强
Owner SOUTH CHINA UNIV OF TECH
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