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US 10,703,369 B2Granted
Method for disengaging hydraulic park without engine power
AssigneeFord Global Technologies, LLC
InventorsRichard Hathaway, Jeffrey James Tumavitch, Than Pham, Joseph Scott Slayton, Markian Diakiw
Life of this patent
Estimating the term…
Abstract
In a special operating mode, a controller is programmed to disengage a hydraulically actuated park mechanism without use of engine power. The starter motor is used to rotate the engine-driven pump at sufficient speed to command disengagement of Park. Once park is disengaged, a holding pin is used to maintain the out of park condition without hydraulic pressure or flow.
Claims19
A vehicle comprising:
- an engine having a crankshaft;
- a starter configured to rotate the crankshaft;
- a transmission having a pump driven by the crankshaft and a hydraulically actuated park mechanism;
- and
- a controller programmed to,
- in response to a sequence of driver actions, enable engine cranking, disable engine firing, and issue hydraulic commands, and
- in response to an engine cranking command, activate the starter to release the park mechanism without starting the engine.
4 more elements
A method to release a hydraulically actuated park mechanism, the method comprising:
- in response to depression of brake and accelerator pedals, unlocking a gear shift module;
- in response to selection of neutral followed by a secondary selection, disabling engine firing and enabling engine cranking;
- and
- in response to a driver initiated cranking command, activating a starter motor and issuing hydraulic commands to release the park mechanism without starting an engine.
1 more element
A vehicle comprising:
- a starter and a pump drivably connected to an engine crankshaft;
- a hydraulically actuated parking mechanism;
- and
- a controller programmed to,
- in response to depression of brake and accelerator pedals, unlock a gear shift module, and
- in response to selection of neutral and a secondary selection, enable engine cranking, disable engine firing, and issue hydraulic commands such that activation of the starter releases the park mechanism without starting an engine.
3 more elements
Dependencies are inferred from the claim text.