Vehicle brake hydraulic pressure control apparatus

Patent metadata

Field	Value
Publication number	US-9701291-B2
Application number	US-201514861473-A
Country	US
Kind code	B2
Filing date	Sep 22, 2015
Priority date	Mar 29, 2013
Publication date	Jul 11, 2017
Grant date	Jul 11, 2017

Abstract

A vehicle brake hydraulic pressure control apparatus includes, as a controller, acceleration acquiring section for acquiring an output value of an acceleration sensor detecting a front-rear direction acceleration of a vehicle, limiting section for limiting the magnitude of the output value acquired by the acceleration acquiring section within a predetermined limit value, a filter (control acceleration calculation section) limiting a change of a value output by the limiting section in a predetermined direction, and holding section for determining a holding pressure according to a value output by the filter and, based on the holding pressure, holding the braking force.

First claim

The invention claimed is:

1. A vehicle brake hydraulic pressure control apparatus capable of performing braking force holding control that holds a braking force for a vehicle to maintain a halt state when the vehicle is at a halt, the vehicle brake hydraulic pressure control apparatus comprising:
an acceleration acquiring section for acquiring an output value of an acceleration sensor detecting a front-rear direction acceleration of the vehicle;
a limiting section for limiting a magnitude of the output value acquired by the acceleration acquiring section within a predetermined limit value;
a filter limiting a change of a value output by the limiting section in a predetermined direction; and
a holding section for determining a holding pressure according to a value output by the filter and, based on the holding pressure, holding the braking force.

2. The vehicle brake hydraulic pressure control apparatus according to claim 1 ,
wherein the holding section sets an upper limit value of the holding pressure to be determined and
the limiting section uses, as the predetermined limit value, a value obtained by adding a predetermined offset amount to an acceleration value corresponding to the upper limit value of the holding pressure.

3. The vehicle brake hydraulic pressure control apparatus according to claim 2 ,
wherein the filter limits a change in a direction in which the value output by the limiting section approaches 0.

4. The vehicle brake hydraulic pressure control apparatus according to claim 2 ,
wherein the filter is configured to limit a change of the value output by the limiting section in a direction equivalent to a front of the vehicle.

5. The vehicle brake hydraulic pressure control apparatus according to claim 2 ,
wherein the filter limits the change of the value output by the limiting section in the predetermined direction to a predetermined gradient and
the predetermined offset amount is set to a value obtained by multiplying a half cycle of pitching of the vehicle by the predetermined gradient.

6. The vehicle brake hydraulic pressure control apparatus according to claim 5 ,
wherein the filter limits a change in a direction in which the value output by the limiting section approaches 0.

7. The vehicle brake hydraulic pressure control apparatus according to claim 5 ,
wherein the filter is configured to limit a change of the value output by the limiting section in a direction equivalent to a front of the vehicle.

8. The vehicle brake hydraulic pressure control apparatus according to claim 1 ,
wherein the holding section sets an upper limit value of the holding pressure to be determined and
the limiting section uses, as the predetermined limit value, an acceleration value corresponding to the upper limit value of the holding pressure.

9. The vehicle brake hydraulic pressure control apparatus according to claim 8 ,
wherein the filter limits a change in a direction in which the value output by the limiting section approaches 0.

10. The vehicle brake hydraulic pressure control apparatus according to claim 8 ,
wherein the filter is configured to limit a change of the value output by the limiting section in a direction equivalent to a front of the vehicle.

11. The vehicle brake hydraulic pressure control apparatus according to claim 1 ,
wherein the filter limits a change in a direction in which the value output by the limiting section approaches 0.

12. The vehicle brake hydraulic pressure control apparatus according to claim 1 ,
wherein the filter is configured to limit a change of the value output by the limiting section in a direction equivalent to a front of the vehicle.

Assignees

• Autoliv Nissin Brake Systems Japan Co Ltd
• Honda Motor Co Ltd

Inventors

• Kinoshita Takashi
• Akamine Kohei
• Koike Masaki

Classifications

• B60T2201/04

  Hill descent control · CPC title

• B60T13/662

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

• B60T8/245

  Longitudinal vehicle inclination · CPC title

• B60T13/686

  in hydraulic systems or parts thereof · CPC title

• B60T2201/06

  Hill holder; Start aid systems on inclined road · CPC title