Gm Global Technolgoy Operations, Inc.

Stephen Lewis Pudvay

Richard B Jess

Timothy John Hartrey

Crystal Nassouri

Mark A Schang

Christopher J Trush

Vincent Holtz

Pascal Tissot

A system for controlling a transmission of a vehicle based on input from a shifter includes first, second, third, and fourth position sensors and a position determination module. The shifter includes a shift lever. The first and second position sensors sense first and second positions of the shift lever, respectively, with respect to first and second axes, respectively, wherein the first and second axes are orthogonal to one another. The third and fourth position sensors sense third and fourth positions of the shift lever, respectively, with respect to third and fourth axes, respectively, wherein the third and fourth axes are orthogonal to one another. In addition, the first and second axes are non-orthogonal to the third and fourth axes. The position determination module determines a position of the shift lever based on the first, second, third, and fourth positions.

System and method for determining vehicle shifter position

A control system includes a shift detection module, a request generation module, and a request setting module. The shift detection module detects when a transmission is executing a shift. The request generation module generates a transmission torque request to cause an engine to increase a transmission input shaft speed to a desired speed at a desired gear ratio when the transmission is executing the shift. The request setting module selectively sets the transmission torque request equal to a default torque request when the transmission torque request is greater than a first torque and the engine is coupled to a drive wheel.

Torque control system and method for shift assist

A shift-by-wire system includes an incremental shift interface that generates an incremental shift signal. A rock control module enables a rocking mode and generates a rock control signal based on status of a vehicle parameter. The rocking mode includes shifting between a first mode and a second mode and back to the first mode. The first mode is one of a reverse mode and a drive mode and the second mode is the other one of the reverse mode and the drive mode. A shift interface module generates a shift control signal to shift a transmission of a vehicle between the first mode and the second mode based on the incremental shift signal and the rock control signal.

Rocking enabled shift-by-wire system

A system includes a pump, accumulator, a sensor which measures line pressure in a fluid circuit, and a controller. The controller plots and calculates respective slopes of first and second sets of measured pressure values from the sensor, calculates a slope ratio, and compares the slope ratio to a threshold. The controller also records the pre-charge pressure as the point of intersection of lines representing the slopes when the ratio exceeds the threshold. A control action is executed when the pre-charge pressure drops below a calibrated minimum threshold. A method includes measuring the pressure values, calculating the respective slopes and the slope ratio, comparing the slope ratio to a ratio threshold, recording the point of intersection of lines representing the slopes as an interpolated pre-charge pressure value when the ratio exceeds the threshold, and executing the control action.

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Howell, MI, United States of America

Stephen Lewis Pudvay