Vehicle braking device

Patent metadata

Field	Value
Publication number	US-12257997-B2
Application number	US-202017640876-A
Country	US
Kind code	B2
Filing date	Sep 17, 2020
Priority date	Sep 27, 2019
Publication date	Mar 25, 2025
Grant date	Mar 25, 2025

Abstract

A vehicle braking device includes a first supply device that supplies brake fluid to wheel cylinders, a first supply path that connects the first supply device and the wheel cylinders, and first and second electromagnetic valves provided on the first supply path. The first electromagnetic valve is disposed on the first supply path such that a seating direction of the first electromagnetic valve and a brake fluid supply direction are opposite each other, the seating direction is a direction in which a valve body is seated on a valve seat, and the brake fluid supply direction is a direction in which the brake fluid flows from the first supply device to the wheel cylinders through the first supply path. The second electromagnetic valve is disposed on the first supply path such that a seating direction of the second electromagnetic valve and the brake fluid supply direction are the same.

First claim

The invention claimed is:

1. A vehicle braking device comprising:
a first supply device configured to supply brake fluid to a first wheel cylinder;
a first supply path configured to connect the first supply device and the first wheel cylinder; and
a first electromagnetic valve and a second electromagnetic valve which are provided on the first supply path, wherein
each of the first electromagnetic valve and the second electromagnetic valve includes a valve body, a valve seat, and a biasing member for biasing the valve body,
the first electromagnetic valve is disposed on the first supply path such that a seating direction of the first electromagnetic valve and a brake fluid supply direction are opposite to each other, the seating direction being a direction in which the valve body is seated on the valve seat, the brake fluid supply direction being a direction in which the brake fluid flows from the first supply device to the first wheel cylinder through the first supply path,
the second electromagnetic valve is disposed on the first supply path such that a seating direction of the second electromagnetic valve and the brake fluid supply direction are the same as each other, and
the fluid path between the first electromagnetic valve and the second electromagnetic valve in the first supply path is not connected to the wheel cylinder in the vehicle.

2. The vehicle braking device according to claim 1 , further comprising:
a second supply device different from the first supply device and configured to supply the brake fluid to the first wheel cylinder; and
a second supply path configured to connect the second supply device and a portion of the first supply path closer to the first wheel cylinder than to the first electromagnetic valve and the second electromagnetic valve, wherein
the first electromagnetic valve and the second electromagnetic valve are closed when the second supply device supplies the brake fluid to the first wheel cylinder.

3. The vehicle braking device according to claim 2 , further comprising:
a pressure sensor configured to detect a hydraulic pressure of the first wheel cylinder; and
a control unit configured to executes at least one of a first operation check control and a second operation check control at a predetermined timing, the first operation check control being an operation check control for the first electromagnetic valve, and the second operation check control being an operation check control for the second electromagnetic valve, wherein
the first operation check control includes:
a first supply processing of closing the first electromagnetic valve, opening the second electromagnetic valve, and operating the first supply device so as to supply such an amount of the brake fluid to the first supply path that a hydraulic pressure in the flow path between the first electromagnetic valve and the first supply device is a first predetermined pressure less than a differential pressure resistance of the first electromagnetic valve when valve-closing of the first electromagnetic valve is normal;
a first valve-closing determination processing of determining whether or not the valve-closing of the first electromagnetic valve is normal based on a detection value of the pressure sensor accompanying the execution of the first supply processing; and
a first valve-opening determination processing of, when the first supply processing is completed and it is determined that the valve-closing of the first electromagnetic valve is normal in the first valve-closing determination processing, opening the first electromagnetic valve, and then determining whether or not valve-opening of the first electromagnetic valve is normal based on a detection value of the pressure sensor, and
the second operation check control includes:
a second supply processing of opening the first electromagnetic valve, closing the second electromagnetic valve, and operating the first supply device so as to supply such an amount of the brake fluid to the first supply path that a hydraulic pressure in the flow path between the second electromagnetic valve and the first supply device is a second predetermined pressure when valve-closing of the second electromagnetic valve is normal;
a second valve-closing determination processing of determining whether or not the valve-closing of the second electromagnetic valve is normal based on a detection value of the pressure sensor accompanying the execution of the second supply processing; and
a second valve-opening determination processing of, when the second supply processing is completed and it is determined that the valve-closing of the second electromagnetic valve is normal in the second valve-closing determination processing, opening the second electromagnetic valve, and then determining whether or not valve-opening of the second electromagnetic valve is normal based on a detection value of the pressure sensor.

4. The vehicle braking device according to claim 3 , wherein
when it is determined by at least one of the first operation check control and the second operation check control that one of the first electromagnetic valve and the second electromagnetic valve is abnormal that the valve cannot be closed, the control unit opens the first electromagnetic valve and the second electromagnetic valve, and the first supply device supplies the brake fluid to the first wheel cylinder.

5. The vehicle braking device according to claim 1 , further comprising:
a pressure sensor configured to detect a hydraulic pressure of the first wheel cylinder; and
a control unit configured to executes at least one of a first operation check control and a second operation check control at a predetermined timing, the first operation check control being an operation check control for the first electromagnetic valve, and the second operation check control being an operation check control for the second electromagnetic valve, wherein
the first operation check control includes:
a first supply processing of closing the first electromagnetic valve, opening the second electromagnetic valve, and operating the first supply device so as to supply such an amount of the brake fluid to the first supply path that a hydraulic pressure in the flow path between the first electromagnetic valve and the first supply device is a first predetermined pressure less than a differential pressure resistance of the first electromagnetic valve when valve-closing of the first electromagnetic valve is normal;
a first valve-closing determination processing of determining whether or not the valve-closing of the first electromagnetic valve is normal based on a detection value of the pressure sensor accompanying the execution of the first supply processing; and
a first valve-opening determination processing of, when the first supply processing is completed and it is determined that the valve-closing of the first electromagnetic valve is normal in the first valve-closing determination processing, opening the first electromagnetic valve, and then determining whether or not valve-opening of the first electromagnetic valve is normal based on a detection value of the pressure sensor, and
the second operation check control includes:
a second supply processing of opening the first electromagnetic valve, closing the second electromagnetic valve, and operating the first supply device so as to supply such an amount of the brake fluid to the first supply path that a hydraulic pressure in the flow path between the second electromagnetic valve and the first supply device is a second predetermined pressure when valve-closing of the second electromagnetic valve is normal;
a second valve-closing determination processing of determining whether or not the valve-closing of the second electromagnetic valve is normal based on a detection value of the pres

Assignees

• Advics Co Ltd

Inventors

• Sakata Yasunori
• Kusano Akihito

Classifications

• B60T2270/88

  Pressure measurement in brake systems · CPC title

• B60T2270/406

  Test-mode; Self-diagnosis · CPC title

• B60T2270/402

  Back-up · CPC title

• B60T17/22

  Devices for monitoring or checking brake systems; Signal devices · CPC title

• B60T13/686

  in hydraulic systems or parts thereof · CPC title