Braking supervision

Patent metadata

Field	Value
Publication number	US-9308823-B2
Application number	US-201214361855-A
Country	US
Kind code	B2
Filing date	Dec 3, 2012
Priority date	Dec 5, 2011
Publication date	Apr 12, 2016
Grant date	Apr 12, 2016

Abstract

A method and control system for a vehicle including a regenerating braking mechanism and a complementary braking mechanism, the method including: receiving at least one vehicle acceleration measurement value, at least one torque value applied by the regenerating braking system, and at least one complementary braking set value for the complementary braking mechanism, wherein the at least one value corresponds to at least one respective measurement moment during a braking transition; and estimating an efficiency coefficient of the complementary braking mechanism from the at least one received value.

First claim

The invention claimed is:

1. A method for monitoring braking for a vehicle including a regenerative brake and a complementary brake, comprising:
receiving at least one vehicle acceleration measurement value from at least one measurement being performed during a braking transition during which the regenerative brake and the complementary brake apply a braking force to the vehicle;
for each received acceleration value, receiving a torque value applied by the regenerative brake and a complementary braking set point value intended for the complementary brake corresponding to an instant of measurement of the acceleration value; and
estimating a coefficient of efficiency of the complementary brake on the basis of the at least one received acceleration measurement value, of the at least one received torque value applied by the regenerative brake, and of the at least one received complementary braking set point value,
wherein a plurality of acceleration measurement values, a plurality of torque values applied by the regenerative brake, and a plurality of complementary braking set point values are received, and
wherein a statistical value of the coefficient of efficiency of the complementary brake is estimated according to a recursive least squares method with a variable omission factor.

2. The method as claimed in claim 1 , further comprising:
receiving at least one pair of acceleration measurement values; and
calculating at least one value of variation of the acceleration based respectively on the at least one pair of measurement values,
wherein the estimating the coefficient of efficiency is performed on the basis of the calculated acceleration variation value, of at least one torque variation value applied by the regenerative brake, and of at least one complementary braking set point variation value intended for the complementary brake.

3. The method as claimed in claim 2 , wherein, for the at least one pair of acceleration measurement values, the acceleration measurement values correspond to measurement instants separated by a time less than or equal to 1 second.

4. The method as claimed in claim 1 , further comprising:
after the estimating, controlling the complementary brake based on the coefficient of efficiency.

5. A braking monitoring device for a vehicle including a regenerative braking means and a complementary braking means, comprising:
means for receiving at least one vehicle acceleration measurement value from at least one measurement being performed during a braking transition during which the regenerative braking means and the complementary braking system apply a braking force to the vehicle;
means for receiving at least one torque value applied by the regenerative braking means and at least one complementary braking set point value intended for the complementary braking means, the at least one torque and set point values corresponding to at least one measurement instant corresponding to the at least one acceleration value; and
processing means for estimating a coefficient of efficiency of the complementary braking means on the basis of the at least one received acceleration measurement value, of the at least one received torque value applied by the regenerative braking means, and of the at least one received complementary braking set point value,
wherein a plurality of acceleration measurement values, a plurality of torque values applied by the regenerative braking means, and a plurality of complementary braking set point values are received, and
wherein a statistical value of the coefficient of efficiency of the complementary braking means is estimated by the processing means according to a recursive least squares method with a variable omission factor.

6. A control system for a vehicle including a regenerative braking means and a complementary braking means, comprising:
a device for distributing a global braking control between the regenerative braking means and the complementary braking means; and
a monitoring device as claimed in claim 5 .

7. A motor vehicle comprising a regenerative braking means, a complementary braking means, and a control system as claimed in claim 6 .

8. A braking monitoring device for a vehicle including a regenerative brake and a complementary brake, comprising:
a microcontroller to receive at least one vehicle acceleration measurement value, at least one torque value applied by the regenerative brake, and at least one complementary braking set point value intended for the complementary brake, the at least one measurement being performed during a braking transition during which the regenerative brake and the complementary brake apply a braking force to the vehicle, and the at least one torque and set point values corresponding to at least one measurement instant corresponding to the at least one acceleration value; and
processing circuitry to estimate a coefficient of efficiency of the complementary brake on the basis of the at least one received acceleration measurement value, of the at least one received torque value applied by the regenerative brake, and of the at least one received complementary braking set point value,
wherein a plurality of acceleration measurement values, a plurality of torque values applied by the regenerative brake, and a plurality of complementary braking set point values are received, and
wherein a statistical value of the coefficient of efficiency of the complementary brake is estimated by the processing circuitry according to a recursive least squares method with a variable omission factor.

9. The braking monitoring device as claimed in claim 8 , wherein the processing circuitry is a digital signal processor.

Assignees

• Renault Sas

Inventors

• Pita-Gil Guillermo
• Azzi Hamid
• Amara Sofiane

Classifications

• B60L2260/42

  by adaptive correction · CPC title

• B60L7/22 Primary

  Dynamic electric resistor braking, combined with dynamic electric regenerative braking · CPC title

• B60L7/26

  Controlling the braking effect · CPC title

• B60L7/18 Primary

  Controlling the braking effect (B60L7/12, B60L7/14, B60L7/16 take precedence) · CPC title

• B60L2240/16

  longitudinal · CPC title