Brake System

• US 20110066345A1
• Filed: 05/25/2009
• Published: 03/17/2011
• Est. Priority Date: 06/06/2008
• Status: Abandoned Application

• Current Assignee: Hitachi Automotive Systems Limited (Hitachi, Ltd.)
• Original Assignee: Hitachi Automotive Systems Limited (Hitachi, Ltd.)
• Inventors: Nishino, Kimio, Innami, Toshiyuki, Miyajima, Ayumu, Nasu, Shingo, Ueno, Kentaro
• Application Number:
  US12/991,896
• Publication Number:
  US 20110066345A1
• Time in Patent Office: Days
• US Class Current: 701/70
• CPC Class Codes: B60L 7/24 with additional mechanical or electromagnetic braking
• CPC Class Codes: B60T 1/10 by utilising wheel movement for accumulating energy, e.g. driving air compressors
• CPC Class Codes: B60T 2270/604 Merging friction therewith; Adjusting their repartition
• CPC Class Codes: Y02T 90/16 Information or communication technologies improving the operation of electric vehicles

Abstract

Fluctuations in a braking force and a deceleration during regenerative cooperative control are suppressed. A brake system includes a master pressure generating device 200, a wheel pressure generating device 300, and a regenerative braking device 18 that operate brake calipers 21a to 21d of respective brakes, and a brake control device 100 that control the actuators 200, 300, and 18. The brake control device 100 includes a braking force calculating unit 111 that determines a frictional braking force outputted at the brake calipers 21a to 21d and a regenerative braking force outputted by the regenerative braking device 18, and a communication control unit 112 that outputs braking force signals corresponding to the respective braking forces to the respective actuators 200, 300, and 18. The brake control device 100 controls the braking forces based on a pedal reaction force and a displacement amount of a piston that pressurizes a master cylinder.

Claims

1. A brake system comprising a pedal and an actuator that generates hydraulic pressure, wherein the brake system controls a braking force based on a pedal reaction force.

2. The brake system according to claim 1, wherein the brake system controls the braking force based on a pedal reaction force and on a displacement amount of a piston that pressurizes a master cylinder.

3. The brake system according to claim 1, wherein the brake system controls the braking force based on a pedal reaction force and on a hydraulic pressure generated by the actuator.

4. The brake system according to claim 2, further comprising a control device that stores braking force characteristics based on a pedal reaction force and on a displacement amount of the piston that pressurizes the master cylinder.

5. The brake system according to claim 3, further comprising a control device that stores braking force characteristics based on a pedal reaction force and on a hydraulic pressure generated by the actuator.

8. An automobile mounted with the brake system according to claim 1.

6. A brake system comprising:

a hydraulic braking device having a pedal, a master pressure generating device, and a wheel pressure generating device; and

a regenerative braking device, wherein

the brake system adjusts a total braking force based on a pedal reaction force and a displacement amount of a piston that pressurizes a master cylinder in order to maintain the total braking force at approximately a constant level when a transition is made from regenerative braking to frictional braking in response to a decrease in vehicle speed.

7. The brake system according to claim 6, further comprising:

means for calculating a maximum regenerative braking force based on a vehicle speed and/or a gear position; and

means for calculating a regenerative braking force limit based on a vehicle speed, wherein

the regenerative braking force limit is to be set as a regenerative braking force when the maximum regenerative braking force is greater than the regenerative braking force limit, and the maximum regenerative braking force is to be set as a regenerative braking force when the maximum regenerative braking force is smaller than the regenerative braking force limit,

and the regenerative braking device is to output the regenerative braking force and the frictional braking device is to output a difference between the total braking force and the regenerative braking force when the total braking force is greater than the regenerative braking force, while the total braking force is to be outputted solely by the regenerative braking device when the total braking force is smaller than the regenerative braking force.

9. An automobile mounted with the brake system according to claim 6.