METHOD AND SYSTEM FOR CONSISTENT BRAKING CONTROL

• US 20090055064A1
• Filed: 08/23/2007
• Published: 02/26/2009
• Est. Priority Date: 08/23/2007
• Status: Active Grant

• Current Assignee: GM Global Technology Operations LLC (General Motors Company)
• Original Assignee: GM Global Technology Operations Incorporated (General Motors Company)
• Inventors: Lin, William C.
• Granted Patent: US 7,835,845 B2
• Time in Patent Office: Days
• US Class Current: 701/70
• CPC Class Codes: B60T 2210/36 Global Positioning System [GPS]
• CPC Class Codes: B60T 2250/02 Vehicle mass
• CPC Class Codes: B60T 7/042 by electrical means, e.g. using travel or force sensors
• CPC Class Codes: B60T 8/174 characterised by using special control logic, e.g. fuzzy logic , neural computing
• CPC Class Codes: B60T 8/3255 Systems in which the braking action is dependent on brake pedal data

Abstract

Brake pedal input is modulated to produce a consistent relationship between the brake pedal input and a deceleration of the vehicle.

Claims

1. A method for controlling braking in a vehicle comprising:

receiving a brake pedal input;

modulating said brake pedal input by a feedback gain and a feed forward gain to create a modulated brake pedal input; and

braking said vehicle based upon said modulated brake pedal input, wherein said modulated brake pedal input is operative to produce a consistent relationship between said brake pedal input and a deceleration of said vehicle.

2. The method of claim 1, wherein said feedback gain comprises deceleration data derived from accelerometer data.

3. The method of claim 1, wherein said feedback gain comprises deceleration data derived from global positioning data.

4. The method of claim 1, wherein said feedback gain comprises deceleration data derived from accelerometer data and from global positioning data.

5. The method of claim 1, wherein said feed forward gain comprises a road slope factor.

6. The method of claim 1, wherein said feed forward gain comprises a load adaptation factor.

7. The method of claim 6, wherein said feed forward gain further comprises a road slope factor.

8. The method of claim 6, wherein said method further comprises establishing a brake control adaptation cycle;

and wherein said load adaptation factor is operative to adjust on the basis of said feedback gain.

9. A braking control system comprising:

a brake pedal system;

a data system operative to generate vehicle data, said vehicle data operative to produce vehicle deceleration data and road slope data;

a brake control module, said brake control module operative to;

receive a brake pedal input from said brake pedal system;

calculate a feedback gain based upon said vehicle deceleration data;

calculate a feed forward gain based upon said road slope data and a load adaptation factor, said load adaptation factor based upon said feedback gain; and

apply said feedback gain and said feed forward gain to said brake pedal input to generate a modulated brake pedal input; and

a braking-torque generating system responding to said modulated brake pedal input.

10. The system of claim 9, wherein said data system comprises an accelerometer.

11. The system of claim 10, wherein said data system further comprises a digital map device.

12. The system of claim 9, wherein said data system comprises a digital map device.