Wire-controlled hydraulic brake system adopting high-pressure energy accumulator and brake control method thereof

Abstract

The invention provides a wire-controlled hydraulic brake system adopting a high-pressure energy accumulator and a brake control method thereof. the high-pressure accumulator in the system is connectedto a pedal cavity through a normally closed one-way switch electromagnetic valve, a pressure cavity of a brake main cylinder is respectively connected with the pedal cavity and a high-pressure energyaccumulator through a normally opening two-way switch electromagnetic valve and a normally closed one-way linear electromagnetic valve; a normally open two-way linear electromagnetic valve of the brake pressure control unit is connected between the two inner cavities of the brake main cylinder and the brake wheel cylinder; a pressure sensor is arranged at the entrance of the brake wheel cylinder,the electromagnetic valve and the sensor are respectively in signal connection with the electronic control unit; the brake control method controls the on-off of the high-pressure energy accumulator and the pressure cavity of the brake main cylinder through the electronic control unit, controls the normally open two-way linear electromagnetic valve, and further controls the correspondingly connected brake wheel cylinders to perform brake pressurization, brake pressure maintenance or brake pressure reduction. According to the wire-controlled hydraulic brake system adopting a high-pressure energy accumulator and the brake control method thereof, rapid and accurate pressure control of the brake system is realized through the high-pressure energy accumulator, and good pedal feedback is provided for a driver.

Description

technical field [0001] The invention belongs to the technical field of a brake-by-wire brake system for an intelligent electric vehicle or an intelligent networked vehicle, and in particular relates to a brake-by-wire hydraulic brake system using a high-voltage accumulator and a brake control method thereof. Background technique [0002] In the existing wire-controlled hydraulic braking system for electric vehicles, the vacuum booster of the traditional vacuum-assisted hydraulic braking system is replaced by a motor and a transmission mechanism, which pushes the piston in the brake master cylinder to generate high-pressure brake fluid, realizing Braking; when braking, the pedal feeling simulation mechanism is used to simulate the pedal feeling when braking. However, the selection of the deceleration mechanism has a great influence on the performance of the motor and the control method, which is not conducive to the versatility of the braking system; the mechanical-hydraulic ...

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Problems solved by technology

However, the selection of the deceleration mechanism has a great influence on the performance of the motor and the control method, which is not conducive to the versatility of the braking system; the mechanical-hydraulic composite system cannot achieve full decoupling from the brake pedal during active braking. Not only will the pedal vibrate when moving, but it will also bring bad subjective feeling to the driver

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