An electric power-assisted braking method and braking system

Abstract

The embodiment of the invention discloses an electric power assist braking method and a braking system. The electric power-assisted braking method includes: determining that the brake pedal returns to the zero position of the brake pedal; driving the hydraulic rack to move toward the zero position of the hydraulic rack until the moving speed of the hydraulic rack drops to the zero speed threshold and the duration is preset Zero position duration; calibrate the current hydraulic rack position as the default mechanical zero position after power-on; after confirming that the brake pedal leaves the brake pedal zero position, the power-on default mechanical zero position is the hydraulic rack zero position, and the brake pedal stroke Converted to rack stroke to drive piston for hydraulic braking. The invention solves the problem that the displacement sensor of the rack needs to be separately provided in the existing electric power-assisted braking system, realizes adjusting the hydraulic rack to the zero position of the hydraulic rack after each braking, and resetting the zero position of the hydraulic rack. Calibration ensures that the hydraulic rack drive produces accurate hydraulic braking force, while simplifying the structure of the braking system and reducing the complexity of the assembly of the braking system.

Description

technical field [0001] Embodiments of the present invention relate to the field of automobile braking, in particular to an electric power-assisted braking method and a braking system. Background technique [0002] As consumers have higher and higher requirements for the comfort, safety and economy of automobiles, more electromechanical products have appeared in the field of automobile braking. [0003] At present, the braking system of a car usually uses a rack decoupling scheme for power-assisted braking. Specifically, the pedal feel is simulated by the pedal spring, and then according to the pedal stroke, the electronic booster is used to drive the motor. Driven by the electromechanical amplifying mechanism, the rack pushes the piston in the hydraulic master cylinder to generate hydraulic output, thereby realizing the corresponding Electronically controlled braking of the pedal stroke. The braking system is provided with a position sensor, and the position of the rack is...

AI Technical Summary

Problems solved by technology

[0004] However, the above-mentioned automobile braking system requires a separate displacement sensor for the rack, and at the same time needs to design a reasonable setting position, which increases the hardware cost and assembly complexity to a certain extent.

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