Vehicle immobilizer method and system
AssigneeFord Global Technologies, LLC
InventorsFelix Nedorezov, Hong Jiang, Steven Gerald Thomas, Alexander O'Connor Gibson
Life of this patent
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Abstract
A system and method of immobilizing a vehicle include receiving a driver presence signal and a transmission state signal and commanding a transmission tie-up in response to the driver presence signal and the transmission state signal. In one embodiment, controlling a transmission element to tie-up a transmission includes braking approximately simultaneously a combination of transmission elements to inhibit rotation of a transmission output and maintaining transmission line pressure to maintain the transmission tie-up when an engine is off.
Claims21
A method of immobilizing a vehicle, comprising:
- commanding a transmission tie-up in response to a driver presence signal and a transmission state signal.
A method of immobilizing a vehicle, comprising:
- controlling at least one transmission element to tie-up a transmission in response to a driver presence signal and a transmission state signal;
- and
- limiting engine speed to a threshold based on the driver's presence signal and the transmission state signal.
A vehicle comprising:
- an automatic transmission;
- and
- a controller communicating with the automatic transmission, the controller configured to generate a signal to place the transmission in a tie-up restricting rotation of a transmission output shaft in response to a driver presence signal.
Dependencies are inferred from the claim text.