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Automotive powertrain control
| Details |
Inventors: Tolkacz, Joseph Mark; Gassenfeit, Eric Hans;
Assignee: General Motors Corporation (Detroit, MI)
Primary Examiner: Wright; Dirk
Assistant Examiner: Kwon; Peter T.
Attorney, Agent or Firm: Bridges; Michael J.
Engine speed control during garage shift maneuvers of a transmission coupled, via a transmission input shaft, to a driven turbine of a hydrodynamic converter, the driven turbine fluidically coupled to a driving pump of the converter, the pump coupled to an engine output shaft, wherein engine output torque is controlled in response to a deviation in turbine acceleration away from a target turbine acceleration, to minimize rate of change in turbine acceleration (jerk) during the garage shift maneuver, so as to reject engine torque load changes that may result in undesirable engine speed variation. |
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DETAILED DESCRIPTION What is claimed is: 1.
A method for controlling speed of an engine coupled, via a hydrodynamic converter, to an automatic transmission, the hydrodynamic converter having a pump rotating with an engine output shaft and a turbine rotating with a transmission input shaft, the transmission having driven and undriven states, the method comprising the steps of: sensing a request for transition between driven and undriven transmission states; determining actual change in turbine speed upon sensing the request; providing a target turbine speed change value; calculating an acceleration error representing a difference between the target turbine speed change and the actual turbine speed change; generating an engine output torque change as a function of the acceleration error to minimize the error; and varying engine output torque in accordance with the generated engine output torque change to control engine speed during the transition between driven and undriven transmission states.
2.
The method of claim 1, further comprising the step of: referencing a base engine control command representing a base engine output torque; and wherein the generating step generates an engine control command as a predetermined function of the acceleration error and of the base engine control command; and wherein the varying step varies engine output torque by controlling an engine control parameter in accordance with the generated engine control command.
3.
The method of claim 2, wherein an air/fuel mixture is ignited in cylinders of the engine at a timing controlled in accordance with an ignition timing command to vary engine output torque, and wherein the engine control command is the ignition timing command.
4.
The method of claim 2, wherein a flow rate of engine intake air is controlled through variation of an intake air valve position command to control a restriction position of an intake air valve to vary engine output torque, and wherein the engine control command is the intake air valve position command
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