Method of determining initial transmission calibration
AssigneeGeneral Motors Corporation
InventorsJeffrey K. Runde, Kevin L. Kluemper, Scott T. Kluemper
Life of this patent
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Abstract
A process for learning the pressure and volume characteristics for a given torque-transmitting mechanism is established on the final assembly line wherein a powertrain incorporating the desired transmission learning is installed within a vehicle. During the test process, the vehicle speed is generally maintained at Idle and the vehicle shift mechanism is maintained in Park, thereby mechanically locking the transmission output shaft. The torque-transmitting mechanisms to be learned are then engaged and disengaged in a predetermined sequence and the volume of the torque-transmitting mechanisms and the pressure characteristics of the controlling solenoid are learned.
Claims3
A method of determining an initial transmission calibration of at least two torque-transmitting mechanisms installed in a vehicle on an assembly line' said method comprising the steps of:
- determining if the vehicle is on the assembly line with the engine at Idle and the transmission in Neutral or Park;
- fully engaging a first of the torque-transmitting mechanisms;
- beginning engagement of a second of the torque-transmitting mechanisms to determine a fill-time and apply chamber volume for the second torque-transmitting mechanism by monitoring a speed of a torque converter turbine in said transmission;
- recording the fill-time and volume;
- determining the pressure characteristic for the second torque-transmitting mechanism by fully applying both of said torque-transmitting mechanisms, reducing the pressure at the second torque-transmitting mechanism until a first predetermined slip speed occurs at the torque converter, recording the pressure, further reducing the pressure at the second torque-transmitting mechanism until a second predetermined slip speed occurs at the torque converter, recording the pressure;
- and
- placing the recorded time, volume, and pressures in the directive cells in the transmission.
Dependencies are inferred from the claim text.