Brake control device and brake system

Patent metadata

Field	Value
Publication number	US-11932224-B2
Application number	US-201917283914-A
Country	US
Kind code	B2
Filing date	Aug 15, 2019
Priority date	Oct 11, 2018
Publication date	Mar 19, 2024
Grant date	Mar 19, 2024

Abstract

An object of the present invention is to provide a brake control device and a brake system capable of braking with a shortened braking response when shifting from non-braking to braking. A brake control device 10 includes a command value calculation unit 4 that calculates an operation command value required to make a pressing force by which a brake pad 11a is pressed against a brake disc 11b reach a target thrust value. The command value calculation unit 4 includes: a clearance command calculation unit 43 that calculates a command value required for contact between the brake pad 11a and the brake disc 11b; and a thrust command calculation unit 40 that calculates a command value required for reaching the target thrust from a state where the brake pad 11a and the brake disc 11b are in contact with each other. When calculating the operation command value from a state where the brake pad 11a and the brake disc 11b are separated, the command value calculation unit 4 calculates the operation command value by integrating the command value calculated from the clearance command calculation unit 43 and the command value calculated from the thrust command calculation unit 40.

First claim

The invention claimed is:

1. A brake control device, which is mounted on a brake system at least including a piston that moves in a linear motion direction by rotation of an electric motor, a brake pad that is pressed against a brake disc by the movement of the piston, and a position detection unit that detects a position of the piston, and controls a motion of the piston, comprising
a command calculation unit that calculates an operation command value for making a pressing force by which the brake pad is pressed against the brake disc reach a target thrust value,
wherein the command calculation unit includes:
a clearance command calculation unit that calculates a command value required for contact between the brake pad and the brake disc; and
a thrust command calculation unit that calculates a command value required for reaching a target thrust from a state where the brake pad and the brake disc are in contact with each other, and

the command calculation unit calculates the operation command value by integrating the command value calculated from the clearance command calculation unit and the command value calculated from the thrust command calculation unit when calculating the operation command value from a state where the brake pad and the brake disc are separated from each other.

2. The brake control device according to claim 1 , wherein
the command calculation unit includes an operation command calculation unit, and
the operation command calculation unit integrates the command value calculated from the clearance command calculation unit and the command value calculated from the thrust command calculation unit and outputs a position command regarding an advance amount of the piston or the electric motor as the operation command value.

3. The brake control device according to claim 2 , wherein
the command calculation unit further includes a speed command calculation unit,
the speed command calculation unit outputs a speed command regarding the advance amount of the piston or the electric motor as the operation command value based on an output from the operation command calculation unit.

4. The brake control device according to claim 3 , wherein
the command calculation unit further includes a torque command calculation unit,
the speed command calculation unit outputs a torque command regarding the advance amount of the piston or the electric motor as the operation command value based on an output from the speed command calculation unit.

5. The brake control device according to claim 1 , wherein
the operation command value causes a piston speed to decrease monotonically after the contact between the brake pad and the brake disc, and a piston speed to a position where the brake pad and the brake disc come into contact with each other is determined without depending on a magnitude of the target thrust.

6. The brake control device according to claim 2 , wherein
the operation command calculation unit obtains an operation command value of a piston position by adding the command value calculated from the clearance command calculation unit and the command value calculated from the thrust command calculation unit, and outputs the obtained operation command value of the piston position as the operation command value.

7. A brake system comprising:
a piston that moves in a linear motion direction by rotation of an electric motor;
a brake pad that is pressed against a brake disc by the movement of the piston;
a position detection unit that detects the position of the piston; and
a brake control device that controls a motion of the piston,
wherein the brake control device according to claim 1 is used as the brake control device.

Assignees

• Hitachi Automotive Systems Ltd
• Hitachi Astemo Ltd

Inventors

• ITAKURA Kyoshiro
• Ajima Toshiyuki
• Ito Takahiro
• Matsubara Kenichiro
• Goto Daisuke
• Matsuura Makoto

Classifications

• B60T8/172 Primary

  Determining control parameters used in the regulation, e.g. by calculations involving measured or detected parameters {(B60T8/17551 takes precedence)} · CPC title

• B60T13/746

  and mechanical transmission of the braking action · CPC title

• B60T17/221

  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

• F16D65/183

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

• B60T1/065

  employing disc (B60T1/062 takes precedence) · CPC title