Brake controlling apparatus

• US 8,527,174 B2
• Filed: 12/09/2008
• Issued: 09/03/2013
• Est. Priority Date: 12/09/2008
• Status: Active Grant

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Watanabe, Ryochi, Kato, Hidehisa
• Primary Examiner(s): Cheung, Mary
• Assistant Examiner(s): BRUSHABER, FREDERICK M
• Application Number:
  US13/124,804
• Publication Number:
  US 20110231076A1
• Time in Patent Office: 1,729 Days
• Field of Search: 701/70, 701/78, 188/152, 303/121
• US Class Current: 701/70
• CPC Class Codes: B60T 8/1755 Brake regulation specially adapted to control the stability of the vehicle, e.g. taking into account yaw rate or transverse acceleration in a curve road vehicle drive control systems for control of driving stability otherwise than by controlling a particular sub-unit B60W30/02
• CPC Class Codes: B60T 8/36 including a pilot valve responding to an electromagnetic force
• CPC Class Codes: B60T 8/4031 Pump units characterised by their construction or mounting pump units in combination with valve blocks B60T8/36
• CPC Class Codes: B60T 8/404 Control of the pump unit
• CPC Class Codes: B60T 8/4872 pump-back systems
• CPC Class Codes: B60T 8/5006 Pressure reapplication by pulsing of valves B60T8/5012, B60T8/5018, B60T8/505, B60T8/5056 take precedence

Abstract

A brake controlling apparatus (electronic control unit) of a braking device including a booster valve to be opened at a time of request to boost a pressure of a brake liquid to supply to a wheel to be controlled, and a piston pump for supplying pressurized brake liquid to an upstream side of the booster valve, the brake controlling apparatus including a brake liquid pressure controlling unit that sets a duty ratio between a closing period and a opening period of the booster valve so that a dischargeable period of the brake liquid in the piston pump appears in the opening period of the booster valve and controls the booster valve based on the duty ratio.

Claims

1. A brake controlling apparatus of a braking device including a booster valve to be opened at a time of request to boost a pressure of a brake liquid to supply to a wheel to be controlled, and a piston pump for supplying pressurized brake liquid to an upstream side of the booster valve, the brake controlling apparatus comprising:

a brake liquid pressure controlling unit that sets a duty ratio between a closing period and a opening period of the booster valve so that the opening period of the booster valve becomes at least a dischargeable period of the brake liquid in the piston pump, and controls the booster valve based on the duty ratio, wherein

the brake liquid pressure controlling unit sets the duty ratio of the booster valve so that the opening period of the booster valve becomes at least a period of longer than or equal to one cycle of the piston pump, and the brake liquid pressure controlling unit sets the duty ratio of the booster valve so that the opening period of the booster valve becomes at least an inverse number of an output rotation number per one second of the electric motor.

3. The brake controlling apparatus according to claim 1, wherein the brake liquid pressure controlling unit is configured to set the duty ratio of the booster valve when a master cylinder pressure to apply on the upstream side of the booster valve is lower than the pressure of the brake liquid to the wheel to be controlled.

2. A brake controlling apparatus of a braking device including a booster valve to be opened at a time of request to boost a pressure of a brake liquid to supply to a wheel to be controlled, and a piston pump for supplying pressurized brake liquid to an upstream side of the booster valve, the brake controlling apparatus comprising:

a brake liquid pressure controlling unit that sets a duty ratio between a closing period and a opening period of the booster valve so that the opening period of the booster valve becomes at least a dischargeable period of the brake liquid in the piston pump, and controls the booster valve based on the duty ratio, wherein

the brake liquid pressure controlling unit sets the duty ratio of the booster valve based on an output rotation number of an electric motor as a drive source of the piston pump, and the brake liquid pressure controlling unit sets the duty ratio of the booster valve so that the opening period of the booster valve becomes at least an inverse number of an output rotation number per one second of the electric motor.

4. The brake controlling apparatus according to claim 2, wherein the brake liquid pressure controlling unit is configured to set the duty ratio of the booster valve when a master cylinder pressure to apply on the upstream side of the booster valve is lower than the pressure of the brake liquid to the wheel to be controlled.