Braking control device

Patent metadata

Field	Value
Publication number	US-9656644-B2
Application number	US-201314397313-A
Country	US
Kind code	B2
Filing date	Apr 26, 2013
Priority date	Apr 27, 2012
Publication date	May 23, 2017
Grant date	May 23, 2017

Abstract

The braking control device for controlling a master cylinder device includes a housing, an output piston, an input piston, a separation chamber opening and closing portion, and a driving hydraulic pressure generating portion, and is provided with an operation control for controlling the master cylinder device in an operation force operating state (regulator mode) in which the output piston is driven by operation force on a brake operation member and in a driving hydraulic pressure operating state (linear mode) in which the output piston is driven by driving hydraulic pressure from the driving hydraulic pressure generating portion; a brake operation judgment portion for judging the presence or absence of a brake operation and the probability thereof and a state transition limiter for limiting at least one of state transitions between the operating states when the presence of the brake operation and possibility thereof is determined.

First claim

The invention claimed is:

1. A braking control device for controlling a master cylinder device which includes:
a tubular housing, a front side of which is closed;
an output piston provided within the housing so that a pressure chamber for pressurizing an operation fluid to be supplied to a hydraulic brake device provided at each vehicle wheel is formed at a front side of the output piston within the housing and defined by the output piston;
an input piston provided rearward of the output piston within the housing so that a separation chamber is formed at a rear side of the output piston, a rear end portion of the input piston being connected to a brake operation member and the input piston being movable in response to an operation force applied to the brake operation member;
a separation chamber opening and closing portion which changes over a state of the separation chamber between an open state where the operation fluid can flow in or out from the separation chamber and a closed state where the operation fluid cannot flow in or out from the separation chamber; and
a driving hydraulic pressure generating portion for generating a driving hydraulic pressure in a driving hydraulic pressure chamber defined by the housing and the output piston, wherein the braking control device includes:
an operation control means which controls the master cylinder device to be in an operation force operating state, where the output piston is driven together with the input piston by the operation force to have the separation chamber to be in the closed state by the separation chamber opening and closing portion and to be in a driving hydraulic pressure operating state, where the separation chamber is in the open state by the separation chamber opening and closing portion to drive the output piston by generating a driving hydraulic pressure in response to an operation amount of the brake operation member in the driving hydraulic pressure chamber by the driving hydraulic pressure generating portion;
a brake operation judgment means for judging at least whether or not a braking operation by the brake operation member is being performed, or whether or not the braking operation will be performed within a predetermined time period; and
a state transition limiting means for limiting at least one of a state transition from the operation force operating state to the driving hydraulic pressure operating state of the master cylinder device and a state transition from the driving hydraulic pressure operating state to the operation force operating state, when the brake operation judgment means judges at least that the braking operation by the brake operation member is being performed or that the braking operation will be performed within the predetermined time period.

2. The braking control device according to claim 1 , wherein the state transition limiting means allows at least one of the state transitions from the operation force operating state to the driving hydraulic pressure operating state of the master cylinder device and from the driving hydraulic pressure operating state to the operation force operating state, regardless of a limiting of the state transition being performed or not, when the brake operation judgment means judges at least that the braking operation by the brake operation member is not being performed or that the braking operation will not be performed within the predetermined time period.

3. The braking control device according to claim 1 , wherein the driving hydraulic pressure generating portion generates the driving hydraulic pressure in the driving hydraulic pressure chamber in response to the operation amount of the brake operation member when the transition state from the operation force operating state to the driving hydraulic pressure operating state of the master cylinder device is limited by the state transition limiting means to hold the master cylinder device to be in the operation force operating state.

4. The braking control device according to claim 1 , wherein the master cylinder device further includes;
a rear chamber defined by an inner peripheral surface of the housing and the output piston, the rear chamber being defined at a rear part of the pressure chamber; a large diameter flange portion formed on the output piston and arranged in the rear chamber, the large diameter flange portion being slidably movably engaged with the inner peripheral surface of the housing;
a reaction force chamber disposed at a front of the large diameter portion and formed by separating the rear chamber, the driving hydraulic pressure chamber disposed at a rear part of the large diameter flange portion and formed by separating the rear chamber;
a chamber to chamber communication passage connecting the separation chamber and the reaction force chamber for absorbing a volume change of the separation chamber and the reaction force chamber in response to an advance movement or a retracting movement of the output piston by transferring of the operation fluid; and
a chamber to chamber communication passage communication interrupting device which interrupts communication of the chamber to chamber communication passage under non-energized state thereof and establishes communication thereof under energized state thereof.

5. The braking control device according to claim 1 , wherein the master cylinder device further includes;
a rear chamber defined by an inner peripheral surface of the housing and the input piston, the rear chamber being defined at a rear of the separation chamber; a large diameter flange portion formed on the input piston and arranged in the rear chamber, the large diameter flange portion being slidably movably engaged with the inner peripheral surface of the housing;
a reaction force chamber disposed at a front of the large diameter portion and formed by separating the rear chamber;
a rear back chamber formed at a rear of the large diameter flange portion by separating the rear chamber;
a chamber to chamber communication passage connecting the separation chamber and the rear back chamber for absorbing a volume change of the separation chamber and the rear back chamber in response to an advance movement or a retracting movement of the input piston by transferring of the operation fluid; and
a chamber to chamber communication passage communication interrupting device which interrupts communication of the chamber to chamber communication passage under non-energized state thereof and establishes communication thereof under energized state thereof.

Assignees

• Advics Co Ltd

Inventors

• Maruyama Masaki
• Noro Kazutaka
• Kobayashi Tatsushi
• Sakata Yasunori
• Nishio Akitaka
• Komazawa Masaaki
• Kamiya Yusuke
• Uchida Kiyoyuki

Classifications

• B60T13/686

  in hydraulic systems or parts thereof · CPC title

• B60T11/20

  Tandem, side-by-side, or other multiple master cylinder units · CPC title

• B60T11/103

  in combination with other control devices (conjoint control of brake system and at least another sub-unit B60W10/188) · CPC title

• B60T11/16 Primary

  Master control, e.g. master cylinders (master cylinders associated with vacuum boosters B60T13/565) · CPC title

• B60T13/662

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