Method for adapting shifts in a motor vehicle transmission

• US 9,353,856 B2
• Filed: 03/20/2012
• Issued: 05/31/2016
• Est. Priority Date: 05/31/2011
• Status: Active Grant

• Current Assignee: ZF Friedrichshafen AG (Zeppelin - Stiftung der Stadt Friedrichshafen)
• Original Assignee: ZF Friedrichshafen AG (Zeppelin - Stiftung der Stadt Friedrichshafen)
• Inventors: Kalthoff, Rudolf, Kurth, Jrg, Mair, Roland, Jger, Thomas, Schneider, Florian
• Primary Examiner(s): Nguyen, John Q
• Assistant Examiner(s): Hutchinson, Alan D
• Application Number:
  US14/117,734
• Publication Number:
  US 20140088843A1
• Time in Patent Office: 1,533 Days
• US Class Current: 1/1
• CPC Class Codes: B60Y 2400/304 Acceleration sensors
• CPC Class Codes: F16H 2061/0087 Adaptive control, e.g. the control parameters adapted by learning
• CPC Class Codes: F16H 59/48 Inputs being a function of acceleration
• CPC Class Codes: F16H 61/04 Smoothing ratio shift
• CPC Class Codes: F16H 61/0437 by using electrical signals F16H61/0403 and F16H61/061 take precedence

Abstract

A method provides for adapting shifts to be carried out in a transmission of a motor vehicle. The shifts are triggered by a transmission control unit and are is controlled and/or governed by the transmission control unit. An actual value corresponding to an acceleration of the motor vehicle is recorded by measuring instruments and is compared to a corresponding target value. On the basis of a deviation between the actual value and the target value, the carrying out of the subsequent shifts of the transmission control unit is adapted. The actual value corresponding to an acceleration of the motor vehicle is individually recorded for several consecutive shift stages of each shift, whereas the actual value in the individual shift stages is compared to the target value in the individual shift stages of the transmission control unit. On the basis of a deviation in the individual shift stages between the actual value and the target value, the carrying out of the subsequent shifts of the transmission control unit is individually adapted for each shift stage.

Claims

1. A method for adapting shifts to be carried out in a transmission of a motor vehicle, wherein the shifts are triggered and controlled by a transmission control unit, the method comprising:

recording by a measuring instrument an actual value corresponding to an acceleration of the motor vehicle, the measuring instrument having a sampling rate selected such that the measuring instrument provides the actual value for each of a plurality of consecutive shift stages for each shift, the plurality of consecutive shift stages including a load reduction stage, a gear disengaging stage, a neutral stage, a gear engaging stage and a load buildup stage;

with the transmission control unit, comparing the recorded actual value for each respective shift stage to a target value for each respective shift stage; and

as a function of a deviation in the individual shift stages between the actual value and the target value, adapting the respective shift stages with the transmission control unit for subsequent shifts of the transmission, the deviation between the particular actual value and the particular target value being determined for all of the consecutive shift stages.

2. The method as in claim 1, wherein the actual values corresponding to an acceleration of the motor vehicle are generated by a sampling of a tilt sensor operatively configured with the transmission.

3. The method as in claim 1, wherein the actual values corresponding to an acceleration of the motor vehicle correspond to an actual value of a longitudinal acceleration of the motor vehicle and an actual value of a vertical acceleration of the motor vehicle.

4. The method as in claim 3, wherein the actual value of a longitudinal acceleration of the motor vehicle is compared to a target value of the longitudinal acceleration of the motor vehicle, and the actual value of a vertical acceleration of the motor vehicle is compared to a target value of the vertical acceleration of the motor vehicle.

5. The method as in claim 4, wherein the actual value of a longitudinal acceleration of the motor vehicle and the actual value of a vertical acceleration of the motor vehicle are allocated to a cumulative actual value that is compared to the target value.

6. A method for adapting shifts to be carried out in a transmission of a motor vehicle, wherein the shifts are triggered and controlled by a transmission control unit, the method comprising:

recording by a measuring instrument an actual value corresponding to an acceleration of the motor vehicle;

with the transmission control unit, comparing the recorded actual value to a target value; and

as a function of a deviation between the actual value and the target value adapting the subsequent shifts of the transmission with the transmission control unit;

wherein each transmission shift comprises a plurality of shift stages, the plurality of shift stages of each transmission shift including individual shift stages of load reduction stage, gear disengaging stage, neutral stage, gear engaging stage and load buildup stage, the actual value corresponding to the acceleration of the motor vehicle is generated by a sampling of a tilt sensor operatively configured with the transmission, and a sampling rate of the tilt sensor is selected so as to determine the actual value for each of the individual shift stages of each transmission shift.

7. A method for adapting shifts to be carried out in a transmission of a motor vehicle, wherein the shifts are triggered and controlled by a transmission control unit, the method comprising:

recording by a measuring instrument an actual value corresponding to an acceleration of the motor vehicle;

with the transmission control unit, comparing the recorded actual value to a target value; and

as a function of a deviation between the actual value and the target value, adapting the subsequent shifts of the transmission with the transmission control unit;

wherein the actual value corresponding to an acceleration of the motor vehicle corresponds to an actual value of a longitudinal acceleration of the motor vehicle and an actual value of a vertical acceleration of the motor vehicle; and

wherein the measuring instrument has a sampling rate selected such that the measuring instrument provides the actual value for each of a plurality of shift stages for each shift, the plurality of consecutive shift stages including a load reduction stage, a gear disengaging stage, a neutral stage, a gear engaging stage and a load buildup stage, the deviation between the particular actual value and the particular target value being determined for all of the consecutive shift stages.

8. The method as in claim 7, wherein the actual value of a longitudinal acceleration of the motor vehicle is compared to a target value of the longitudinal acceleration of the motor vehicle, and the actual value of a vertical acceleration of the motor vehicle is compared to a target value of the vertical acceleration of the motor vehicle.

9. The method as in claim 7, wherein the actual value of a longitudinal acceleration of the motor vehicle and the actual value of a vertical acceleration of the motor vehicle are allocated to a cumulative actual value that is compared to a target value.

10. A transmission control unit for a motor vehicle configured to adapt transmission shifts of the motor vehicle, the transmission control unit comprising:

a measuring instrument configured to record an actual value corresponding to an acceleration of the motor vehicle, the measuring instrument having a sampling rate selected such that the measuring instrument provides the actual value for each of a plurality of consecutive shift stages for each transmission shift, the plurality of consecutive shift stages including a load reduction stage, a gear disengaging stage, a neutral stage, a gear engaging stage and a load buildup stage;

the transmission control unit configured to compare the recorded actual value for each respective shift stage to a target value for each respective shift stage for all of the consecutive shift stages; and

as a function of a deviation in the individual shift stages between the actual value and the target value, the transmission control unit configured to adapt the respective shift stages for subsequent shifts of the transmission.

11. The transmission control unit as in claim 10, further comprising a tilt sensor operatively configured with the transmission, wherein the actual values corresponding to an acceleration of the motor vehicle are generated by a sampling of the tilt sensor.

12. The transmission control unit as in claim 11, wherein the tilt sensor is configured to generate an actual value of a longitudinal acceleration of the motor vehicle and an actual value of a vertical acceleration of the motor vehicle.

13. The transmission control unit as in claim 12, wherein the transmission control unit is configured to compare the actual value of a longitudinal acceleration of the motor vehicle to a target value of the longitudinal acceleration of the motor vehicle, and to compare the actual value of a vertical acceleration of the motor vehicle to a target value of the vertical acceleration of the motor vehicle.

14. The transmission control unit as in claim 13, wherein the transmission control unit is configured to allocate the actual value of a longitudinal acceleration of the motor vehicle and the actual value of a vertical acceleration of the motor vehicle to a cumulative actual value that is compared to the target value.