Electric braking device for vehicle

Patent metadata

Field	Value
Publication number	US-11518361-B2
Application number	US-201716342264-A
Country	US
Kind code	B2
Filing date	Nov 7, 2017
Priority date	Nov 7, 2016
Publication date	Dec 6, 2022
Grant date	Dec 6, 2022

Abstract

Provided is an electric braking device wherein a friction member is pressed, via a piston driven by an electric motor, against a rotary member that rotates integrally with a vehicle wheel, thus generating a braking force on the vehicle wheel. The electric braking device is provided with: a controller for controlling the electric motor; a rotation angle sensor for detecting a rotation angle of the electric motor; and a return mechanism for applying a return force to a piston in a direction away from the rotary member. Furthermore, the controller executes a proper/improper determination to determine whether the return mechanism is operating properly on the basis of a change in the rotation angle after conduction of electricity to the electric motor is stopped.

First claim

The invention claimed is:

1. An electric braking device for a vehicle, configured to generate a braking force at a wheel of the vehicle by making a friction member pressed against a rotation member that rotates integrally with the wheel, via a piston driven by an electric motor, the electric braking device comprising:
a controller that controls the electric motor;
a rotation angle sensor that measures a rotation angle of the electric motor; and
a returning mechanism that applies a returning force to the piston in a direction away from the rotation member,
wherein the controller is configured to, when there is no braking request by a driver, supply electricity to drive the electric motor until the rotation angle of the electric motor reaches a determination start angle, then stop the supply of electricity to the electric motor, then execute determination whether the returning mechanism operates properly, on a basis of change in the rotation angle of the electric motor, while the supply of electricity to the electric motor remains stopped, and
wherein, at the determination start angle, a pressing force of the piston against the friction member is zero.

2. An electric braking device for a vehicle, configured to generate a braking force at a wheel of the vehicle by making a friction member pressed against a rotation member that rotates integrally with the wheel, via a piston driven by an electric motor, the electric braking device comprising:
a controller that controls the electric motor;
a pressing force sensor that measures a pressing force of the piston against the friction member; and
a returning mechanism that applies a returning force to the piston in a direction away from the rotation member,
wherein the controller is configured to, when there is no braking request by a driver, supply electricity to drive the electric motor until the pressing force of the piston against the friction member reaches zero, then stop the supply of electricity to the electric motor, then execute determination whether the returning mechanism operates properly, on a basis of change in the pressing force on the friction member, while the supply of electricity to the electric motor remains stopped.

Assignees

• Advics Co Ltd

Inventors

• Tsukamoto Shun
• Yukoku Shinichiro

Classifications

• F16D65/183

  with force-transmitting members arranged side by side acting on a spot type force-applying member · CPC title

• F16D2125/40

  Screw-and-nut · CPC title

• F16D55/226

  in which the common actuating member is moved axially {, e.g. floating caliper disc brakes} · CPC title

• B60T17/221 Primary

  Procedure or apparatus for checking or keeping in a correct functioning condition of brake systems (hydraulic pressure systems in general F15B19/00, F15B21/04; testing structures or apparatus G01M) · CPC title

• F16D2055/0029

  Retraction devices · CPC title