Combined braking control method based on brake-by-wire and electronic parking brake

Abstract

The invention discloses a combined brake control method based on brake-by-wire and electronic parking brake. The combined brake control method based on brake-by-wire and electronic parking brake comprises the following steps of 1) judging whether a current vehicle is on a ramp or not; 2) if the vehicle is on the ramp and needs to be braked to park, firstly, starting a brake-by-wire system to brake; and after a vehicle speed is reduced to a vehicle speed threshold V=1-10 km / h, starting an electronic parking brake system during using the brake-by-wire system till the brake-by-wire system is closed after the vehicle parks stably. According to the combined brake control method based on brake-by-wire and electronic parking brake, by increasing ramp judging, an EPB function is invoked in advanceduring a certain gradient in the brake-by-wire process to guarantee the braking performance; and therefore, the steep slope automatic driving safety is greatly enhanced.

Description

technical field [0001] The invention relates to a vehicle braking control method, in particular to a combined braking control method based on wire-controlled braking and electronic parking braking. Background technique [0002] At present, automobiles generally adopt a single brake-by-wire system or an electronic parking brake system (referred to as EPB), which are respectively solidified into a braking function and a parking function, and there is no effective joint control of the two. After the single brake-by-wire system receives the target pressure / target deceleration, it pumps the brake fluid to the wheel cylinders for pressure-building braking. The maximum wheel cylinder pressure is limited to 8MPa, and insufficient braking force may occur. Moreover, the system realizes the flow of brake fluid through the control valve. If the valve is energized for too long, the temperature of the valve will be too high, causing control failure or affecting the control effect, so it c...

AI Technical Summary

Problems solved by technology

[0002] At present, cars generally use a single brake-by-wire system or an electronic parking brake system (referred to as EPB), which are respectively solidified into a braking function and a parking function, and there is no effective joint control of the two

After the single brake-by-wire system receives the target pressure / target deceleration, it pumps the brake fluid to the wheel cylinders to perform pressure building braking. The maximum wheel cylinder pressure is limited to 8MPa, which may cause insufficient braking force

And the system realizes the flow of brake fluid through the control valve. If the valve is energized for too long, the temperature of the valve will be too high, causing control failure or affecting the control effect, so it cannot be braked for a long time.

The single electronic parking brake system is only used to prevent the slope from slipping after the vehicle has come to a complete stop. EPB, there may be a risk of rolling

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