A slope assist system based on electro-hydraulic braking and its control method

Abstract

The invention discloses a ramp auxiliary system based on electro-hydraulic braking and a control method thereof , including a ramp start assist key for reflecting the driver's intent to open the rampstart assist system, Slope sensor, wheel speed sensor, gear information sensor, parking system working sensor, accelerator pedal position sensor, electronic control unit and electro-hydraulic brake system. The invention also discloses a ramp starting assistant system control method based on electro-hydraulic brake. The invention can accurately calculate and apply the required ramp braking force according to the current state of the vehicle when starting, thereby preventing the vehicle from rolling on the ramp and eliminating the hidden danger of safety. Accurate control of braking force can berealized by controlling the change of current value of servo motor in electro-hydraulic brake structure, and only the accelerator pedal can be controlled to start, which is easy to operate and improves the comfort and safety of driver. No need to install ESP to reduce loading cost.

Description

technical field [0001] The invention relates to a slope assist system based on electronic hydraulic braking and a control method thereof, belonging to the technical field of automobile braking systems. Background technique [0002] The traditional braking system usually consists of a brake pedal, a vacuum booster pump, a brake master cylinder, a brake wheel cylinder and corresponding pipelines. has become a research hotspot. At present, researchers have developed an electronic hydraulic braking system by replacing the vacuum booster pump with a small-sized and light-weight motor. The system uses a pedal simulator to simulate the pedal feel, and the motor directly pushes the servo master cylinder piston to build pressure on the servo master cylinder, realizing the decoupling of pedal force and braking force, so that the braking force can be controlled very precisely. [0003] When the car starts uphill, the traditional method is to first pull the handbrake, then step on the...

AI Technical Summary

Problems solved by technology

However, the braking pressure before the brake pedal is released is generally greater than the minimum braking pressure required to keep the vehicle stationary, so this control method causes a waste of braking force, and at the same time, the high oil pressure in the pipeline increases the risk of oil leakage. hidden danger; moreover, this kind of HHC does not have a strategy for the gradual withdrawal of braking force when starting downhill; finally, the traditional braking system must be installed with ESP in order to realize the HHC function, which increases the installation cost

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