Method and device for managing a turning setpoint applied to at least one turning actuator for the rear wheels of an automobile

• US 8,712,645 B2
• Filed: 04/22/2008
• Issued: 04/29/2014
• Est. Priority Date: 05/14/2007
• Status: Expired due to Fees

• Current Assignee: Renault Sas (Renault)
• Original Assignee: Renault Sas (Renault)
• Inventors: Chassagnol, Cedric, Guegan, Stephane
• Primary Examiner(s): Olszewski, John R
• Assistant Examiner(s): CASS, JEAN PAUL
• Application Number:
  US12/600,130
• Publication Number:
  US 20100161181A1
• Time in Patent Office: 2,198 Days
• Field of Search: None
• US Class Current: 701/42
• CPC Class Codes: B60T 2260/024 Yawing moment compensation during mu-split braking
• 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 8/1764 Regulation during travel on surface with different coefficients of friction, e.g. between left and right sides, mu-split or between front and rear
• CPC Class Codes: B60W 10/184 with wheel brakes
• CPC Class Codes: B60W 10/20 including control of steering systems
• CPC Class Codes: B60W 2710/207 Steering angle of wheels
• CPC Class Codes: B60W 30/02 Control of vehicle driving stability
• CPC Class Codes: B62D 6/002 computing target steering angles for front or rear wheels B62D7/159 takes precedence
• CPC Class Codes: B62D 7/159 characterised by computing methods or stabilisation processes or systems, e.g. responding to yaw rate, lateral wind, load, road condition

Abstract

A method for managing a turning setpoint applied to at least one turning actuator for rear wheels of an automobile including four steering wheels, the turning setpoint being generated by a turning control unit upon a braking situation with asymmetrical adhesion. The method calculates an intermediate turning setpoint of the rear wheels for compensating a yaw torque generated by a braking with asymmetrical adhesion of the four wheels, transmits an intermediate turning setpoint to the at least one turning actuator for the rear wheels, monitors the value of the intermediate turning setpoint using an acceptation module, and transmits to a braking control unit information generated by the acceptation module of the intermediate turning setpoint.

Claims

1. A method for managing a turning setpoint applied to at least one turning actuator of rear wheels of a motor vehicle including four steering wheels, the turning setpoint being generated by a braking control unit during a braking situation with asymmetrical adhesion, the method comprising:

calculating a turning setpoint of the rear wheels making it possible to compensate for a yaw torque generated by the braking with asymmetrical adhesion of the four wheels;

transmitting the turning setpoint to the at least one turning actuator of the rear wheels;

monitoring a value of the turning setpoint by an acceptance module which either accepts the turning setpoint or does not accept the turning setpoint, the monitoring including the acceptance module accepting the turning setpoint when;

a braking control member is actuated by a driver of the vehicle,

a braking assistance system is activated,

the vehicle is travelling forward, and

a communication is established between the braking control unit and a turning control unit;

when the acceptance module accepts the turning setpoint,

transmitting to the braking control unit an item of information generated by the acceptance module and indicating to the braking control unit that the turning setpoint was accepted, and

turning, via the turning actuator, the rear wheels of the motor vehicle according to the turning setpoint in order to compensate for the yaw torque generated by the braking with asymmetrical adhesion of the four wheels; and

when the acceptance module does not accept the turning setpoint,

transmitting to the braking control unit an item of information generated by the acceptance module and indicating to the braking control unit that the turning setpoint was not accepted, and

adapting the braking applied to the rear wheels of the motor vehicle without turning the rear wheels of the motor vehicle according to the turning setpoint.

2. The method for managing a turning setpoint as claimed in claim 1, wherein the monitoring the turning setpoint value is carried out in the turning control unit of the rear wheels.

3. The method for managing a turning setpoint as claimed in claim 1, wherein the turning setpoint is calculated by the braking control unit.

6. The method for managing a turning setpoint as claimed in claim 1, wherein the communication is not established between the braking control unit and the turning control unit when braking occurs without asymmetrical adhesion.

4. A management device of a turning setpoint applied to at least one turning actuator of rear wheels of a motor vehicle including four steering wheels, the turning setpoint being generated by a turning control unit during a braking situation with asymmetrical adhesion, the management device comprising:

an acceptance module which either accepts a value of a turning setpoint calculated by a braking control unit or does not accept the turning setpoint, and the acceptance module monitors the value of the turning setpoint and accepts the turning setpoint when;

a braking control member is actuated by a driver of the vehicle,

a braking assistance system is activated,

the vehicle is travelling forward, and

a communication is established between the braking control unit and the turning control unit,

wherein the acceptance module transmits to the braking control unit an item of information generated by the acceptance module of the turning setpoint and indicating to the braking control unit that the turning setpoint was accepted, and the turning actuator turns the rear wheels of the motor vehicle according to the turning setpoint in order to compensate for the yaw torque generated by the braking with asymmetrical adhesion of the four wheels when the acceptance module accepts the turning setpoint, and

transmits to the braking control unit an item of information generated by the acceptance module and indicating to the braking control unit that the turning setpoint was not accepted, and

the braking control unit adapts the braking applied to the rear wheels without turning the rear wheels of the motor vehicle according to the turning when the acceptance module does not accept the turning setpoint.

5. The device as claimed in claim 4, wherein the acceptance module of the turning setpoint is incorporated into the turning control unit of the rear wheels.

7. The device as claimed in claim 4, wherein the communication is not established between the braking control unit and the turning control unit when braking occurs without asymmetrical adhesion.