VEHICLE BRAKING DEVICE

• US 20200130655A1
• Filed: 03/26/2018
• Published: 04/30/2020
• Est. Priority Date: 03/27/2017
• Status: Active Application

• Current Assignee: Advics Company Limited (Aisin Corp.)
• Original Assignee: Advics Company Limited (Aisin Corp.)
• Inventors: HASHIMOTO, Kosuke, NAKATA, Daisuke
• Application Number:
  US16/493,915
• Publication Number:
  US 20200130655A1
• Time in Patent Office: Days
• CPC Class Codes: B60T 13/12 the fluid being liquid
• CPC Class Codes: B60T 13/145 Master cylinder integrated or hydraulically coupled with booster
• CPC Class Codes: B60T 13/16 using pumps directly, i.e. without interposition of accumulators or reservoirs
• CPC Class Codes: B60T 13/66 Electrical control in fluid-pressure brake systems
• CPC Class Codes: B60T 13/662 characterised by specified functions of the control system components
• CPC Class Codes: B60T 13/686 in hydraulic systems or parts thereof
• CPC Class Codes: B60T 7/042 by electrical means, e.g. using travel or force sensors
• CPC Class Codes: B60T 7/18 operated by wayside apparatus
• CPC Class Codes: B60T 8/4081 Systems with stroke simulating devices for driver input B60T8/4077 takes precedence

Abstract

The present invention includes: a normal control unit that performs, on the basis of a target master pressure and an actual-master-pressure correlation value correlated with an actual master pressure value, pressure increasing control, which is control to increase the master pressure, maintaining control, which is control to maintain the master pressure, or pressure reducing control, which is control to reduce the master pressure; a drive suppression unit that performs drive suppression control to suppress driving of master pistons when the actual-master-pressure correlation value approaches the target master pressure while the normal control unit is performing the pressure increasing control or the pressure reducing control; and a suppression-level setting unit that is configured to include wheel cylinders and that sets a suppression level for drive suppression control on the basis of the rigidity of a downstream part, which is closer to the wheel cylinders than master chambers.

Claims

1. A vehicle braking device that drives a master piston of a master cylinder to generate wheel pressure in a plurality of wheel cylinders connected to a master chamber of the master cylinder,

the vehicle braking device comprising:

a normal control unit that executes a pressure increasing control that is a control of increasing the master pressure, a maintaining control which is a control of maintaining the master pressure, or a pressure reducing control that is a control of reducing the master pressure based on an actual-master-pressure correlation value correlated with an actual value of a master pressure that is a pressure in the master chamber and a target master pressure that is a target value of the actual-master-pressure correlation value;

a drive control unit that executes a drive suppression control for suppressing drive of the master piston when the actual-master-pressure correlation value approaches the target master pressure while the normal control unit is executing the pressure increasing control or the pressure reducing control; and

a suppression-level setting unit that sets a suppression level in the drive suppression control based on a rigidity of a downstream part that is a part on the wheel cylinder side than the master chamber configured to include the wheel cylinder.

2. The vehicle braking device according to claim 1, wherein the suppression-level setting unit reduces the suppression level as the rigidity is lower.

3. The vehicle braking device according to claim 1, wherein the suppression-level setting unit determines high and low of the rigidity based on at least one of the actual-master-pressure correlation value, the wheel pressure, and the pressure of the downstream part.

4. The vehicle braking device according to claim 2, wherein the suppression-level setting unit determines high and low of the rigidity based on at least one of the actual-master-pressure correlation value, the wheel pressure, and the pressure of the downstream part.