Method for Multi-Operating Mode Control of an Automated Transmission for a Motor Vehicle, in Particular for Idle Speed Running With Activated Brake and Corresponding Device

• US 20080015757A1
• Filed: 09/06/2005
• Published: 01/17/2008
• Est. Priority Date: 09/10/2004
• Status: Abandoned Application

• Current Assignee: Renault Sas (Renault)
• Original Assignee: Renault Sas (Renault)
• Inventors: Vermuse, Vincent, Roudeau, Frederic, Bretheau, Jean
• Application Number:
  US11/575,055
• Publication Number:
  US 20080015757A1
• Time in Patent Office: Days
• US Class Current: 701/51
• CPC Class Codes: B60W 10/02 including control of driveline clutches
• CPC Class Codes: B60W 10/04 including control of propulsion units
• CPC Class Codes: B60W 10/06 including control of combustion engines
• CPC Class Codes: B60W 2540/103 Accelerator thresholds, e.g. kickdown
• CPC Class Codes: B60W 2540/12 Brake pedal position
• CPC Class Codes: B60W 2710/105 Output torque
• CPC Class Codes: B60W 30/18063 Creeping
• CPC Class Codes: B60W 30/1819 Propulsion control with control means using analogue circuits, relays or mechanical links
• CPC Class Codes: F16H 2061/202 Active creep control for slow driving, e.g. by controlling clutch slip
• CPC Class Codes: F16H 59/54 dependent on signals from the brakes, e.g. parking brakes
• CPC Class Codes: F16H 61/20 Preventing gear creeping ; Transmission control during standstill, e.g. hill hold control

Abstract

A method for controlling an automated transmission for a power train of a motor vehicle produces a first setpoint signal of a variable that is applicable to the vehicle wheels and that includes dynamic and static components formed taking into consideration input representative data of the motor vehicle characteristics, a driver'"'"'s wish, and an environment of the vehicle, in selecting, according to the input data, one mode from at least two different operating modes able to transmit the setpoint signal. One operating mode corresponds to a torque creeping mode for transmitting the setpoint signal when the motor vehicle runs with a speed lower than a predetermined threshold and the brake pedal thereof is activated.

Claims

1-7. -7. (canceled)

8. A method of controlling an automated transmission of a power train for a motor vehicle, comprising:

formulating a setpoint signal of a variable to be applied to wheels of the motor vehicle, the setpoint including a dynamic component and a static component formulated by taking account of input data representative of characteristics of the motor vehicle, of a desire of a driver, and of an environment of the motor vehicle,

wherein, as a function of the input data, a mode is selected from among at least first and second different operating modes, capable of delivering the setpoint signal, the first mode corresponding to a torque creeping mode configured to deliver the setpoint signal when the motor vehicle advances at a speed less than a predetermined threshold and when the brake pedal of the motor vehicle is activated.

9. The method as claimed in claim 8, wherein the torque creeping mode and/or a value of the setpoint delivered when the torque creeping mode is selected, are determined as a function of a signal representative of a whole set of resistive torques applied to the motor vehicle, measured or estimated at the wheels of the motor vehicle and representative of a load carried by the motor vehicle and/or of unevennesses of a road profile.

10. The method as claimed in claim 9, wherein the torque creeping mode and/or a value of the setpoint delivered when the torque creeping mode is selected, are determined as a function of a signal representative of the dynamic component of the setpoint undergoing application.

11. The method as claimed in claim 10, wherein the torque creeping mode and/or a value of the setpoint delivered when the torque creeping mode is selected, are determined as a function of a signal representative of resistive torques applied to the wheels and that the motor vehicle must overcome to be able to move off.

12. A device for controlling an automated transmission of a power train for a motor vehicle, configured to deliver setpoint signals of a variable to be applied to wheels of the motor vehicle, the setpoint including a dynamic component and a static component, formulated by taking account of input data, delivered by an input block and including a list of parameters defining characteristics of the motor vehicle, a desire of the driver, and an environment of the motor vehicle, the device comprising:

a control block including at least two modules corresponding to two distinct and predetermined operating modes, one of the modules corresponding to a torque creeping mode selected when the motor vehicle advances at a speed less than a predetermined threshold, when an acceleration pedal is less than a predetermined threshold, and when the brake pedal of the motor vehicle is activated; and

a selection module receiving signals originating from the input block and configured to deliver a selection signal for an operating mode module as a function of the input data.

13. The device as claimed in claim 12, wherein the module for the torque creeping mode comprises:

a first block configured to formulate a raw dynamic component of the setpoint as a function of a predetermined list of parameters,

a temporal filter configured to delay a variable received as an input,

a second block configured to formulate a validation variable to activate the temporal filter, when a signal indicating entry into the torque creeping mode switches from a first value to a second value,

a third block configured to formulate a state variable indicating operation in a drag reduction while stationary phase, as a function of the first predetermined list of parameters,

a fourth block configured to calculate a modulation coefficient based on the state variable, so as progressively to apply correction afforded during the drag reduction while stationary phase,

means for performing operations on the variables delivered by the blocks included in the module intended for the torque creeping mode as a function of a third list of predetermined input parameters,

means for delaying the dynamic component of the setpoint undergoing application,

means for storing calibratable parameters,

means for comparing the dynamic component, a value of a raw static component, and a minimum torque quantity applicable to the wheel, with a signal representative of resistive torques applied to the wheels and that the motor vehicle must overcome to be able to move off.

14. The device as claimed in claim 12, wherein the list of predetermined parameters includes speed of the motor vehicle and a signal representative of a whole set of resistive torques applied to the motor vehicle.. measured or estimated at the wheels of the motor vehicle and representative of the load carried by the motor vehicle and/or of unevennesses of a road profile.