Braking control device for vehicle

Patent metadata

Field	Value
Publication number	US-11220248-B2
Application number	US-201816611252-A
Country	US
Kind code	B2
Filing date	May 23, 2018
Priority date	May 29, 2017
Publication date	Jan 11, 2022
Grant date	Jan 11, 2022

Abstract

A control device including a valve-opening control unit that reduces the current value below the holding current value and increases the opening degree of the differential pressure adjustment valve when an increase in a manipulated variable of a braking operation member has been detected while holding control is being performed; and a valve-closing control unit that, when a decrease in the manipulated variable of the braking operation member has been detected while the opening degree of the differential pressure adjustment valve has been increased by the valve-opening control unit, performs a pushing process of increasing the current value above the holding current value and closing the differential pressure adjustment valve, and a holding process of setting the current value to the holding current value after the pushing process has ended.

First claim

The invention claimed is:

1. A braking control device for a vehicle applied to a braking device for the vehicle including a control valve arranged between a master cylinder in which fluid pressure generated inside increases as a manipulated variable of a braking operation member increases and a wheel cylinder provided with respect to a wheel,
the braking control device for the vehicle performing a holding control of holding a differential pressure, which is a pressure difference between a master cylinder side and a wheel cylinder side with respect to the control valve, at a prescribed differential pressure by setting a current value input to the control valve to a predetermined holding current value, the braking control device comprising:
a valve-opening control unit that makes the current value input to the control valve smaller than the holding current value and increases an opening degree of the control valve when increase in the manipulated variable of the braking operation member is detected during execution of the holding control; and
a valve-closing control unit that, when decrease in the manipulated variable of the braking operation member is detected under a situation where the opening degree of the control valve is increased by the valve-opening control unit, sets the current value input to the control valve to a value larger than the holding current value, and performs a pushing process of shifting the control valve from a non-closed state to a closed state and a holding process of setting the current value input to the control valve at the holding current value after the pushing process has ended,
wherein the valve-closing control unit performs another pushing process of setting the current value input to the control valve to a value larger than the holding current value at a timing of holding a fluid pressure in the wheel cylinder under a situation where the holding process is performed, and again performs the holding process after the other pushing process has ended.

2. The braking control device for the vehicle according to claim 1 , wherein the valve-closing control unit calculates a timing to hold the fluid pressure in the wheel cylinder based on a decrease rate of the manipulated variable of the braking operation member.

Assignees

• Advics Co Ltd

Inventors

• Hiromura Tatsuya
• Mori Yukio

Classifications

• B60T8/172 Primary

  Determining control parameters used in the regulation, e.g. by calculations involving measured or detected parameters {(B60T8/17551 takes precedence)} · CPC title

• B60T13/662 Primary

  characterised by specified functions of the control system components · CPC title

• B60T8/3275

  Systems with a braking assistant function, i.e. automatic full braking initiation in dependence of brake pedal velocity · CPC title

• B60T8/17

  Using electrical or electronic regulation means to control braking {(detecting or indicating faulty operation B60T8/885)} · CPC title

• B60T8/404

  Control of the pump unit · CPC title