Daimlerchrysler Corporation

Michael J McNeil

Gerald L Holbrook

Andrew J Harkenrider

Javed Dada

Brandon Brigham

Nathan Hosler

A turbine acceleration control system for a transmission in a vehicle determines a desired turbine acceleration based on a downshift type and an altitude of the vehicle. The turbine acceleration control system determines a downshift type that results from one of a throttle increase, a manual downshift, or vehicle deceleration. An altitude module determines an altitude of the vehicle. A vehicle controller communicates with one or more lookup tables to determine the desired turbine acceleration based on the downshift type and the altitude. Additionally, current turbine speed and torque converter slip are considered by the controller in determining the desired turbine acceleration.

Downshift acceleration control

A method of determining the shift lever position of an electronic automatic transmission system by identifying the mode of transmission operation selected by the driver of the vehicle to provide hysteresis between the park, reverse, neutral, drive and low positions, to permit improved performance and response of the controller and to permit limited operation of the controller upon the occurrence or detection of a fault effecting the performance of the transmission. Such faults include the loss of a PRND2L sensor and the loss of one or more sensors indicative of the dynamics of the vehicle or hydraulic circuit.

Shift lever position logic

The present provides a shutdown shift schedule which allows a vehicle driver an increased number of gear states to increase driveability. This method monitors the gear state conditions indicative of the gear state which said automatic transmission is in. When the shift state conditions vary from predetermined standards, the controller uses the shutdown shift schedule in place of the shift schedule for changing gears of the automatic transmission. This shutdown shift schedule is adapted to allow a 3-1 shift when the shift solenoid is in a shift D position and the shift state is 3. The shutdown shift schedule is also adapted to allow a 3-2 shift when the shift state is 3 and the shift solenoid is in the shift 2 position.

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Rochester Hills, MI, United States of America

Michael J McNeil