Method for shifting a shift-by-wire transmission without engine power
AssigneeFord Global Technologies, LLC
InventorsBrian J. DEURLOO, Jeffrey James TUMAVITCH, Derek KINCH, Richard Reynolds HATHAWAY, Todd Curtis SPAULDING
Life of this patent
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Abstract
A vehicle according to the present disclosure includes a shift-by-wire transmission, a pressure source configured to selectively provide hydraulic pressure in the absence of engine power, an internal combustion engine, and a controller. The shift-by-wire transmission includes a hydraulic actuator, and the electric pump is in fluid communication with the actuator. The controller is configured to, in response to a driver input and the engine being off, control the pressure source to provide hydraulic pressure to the hydraulic actuator.
Claims14
A vehicle comprising:
- an internal combustion engine;
- a shift-by-wire transmission including a hydraulic actuator coupled to a shift element configured to selectively place the transmission in PARK;
- a pressure source in fluid communication with the hydraulic actuator and configured to selectively provide pressure in the absence of engine power;
- and
- a controller configured to, in response a driver input with the engine off, control the pressure source to provide hydraulic pressure to the hydraulic actuator.
A method for controlling a vehicle including an engine, a shift-by-wire transmission having a parking gear and having an engine-driven pump, and an accumulator in fluid communication with the parking gear, the method comprising:
- in response to the engine being on, controlling the transmission pump to provide hydraulic pressure to the transmission;
- and
- in response to a driver input and the engine being off, controlling the accumulator to provide hydraulic pressure to the parking gear.
A method for controlling a vehicle including a shift-by-wire transmission with a parking gear and an electric pump in fluid communication with the parking gear, comprising:
- in response to a first driver input with the transmission in PARK and the engine being off, controlling the pump to provide hydraulic pressure to the parking gear;
- and
- without starting the engine, shifting the transmission out of PARK in response to a second driver input.
Dependencies are inferred from the claim text.