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US 9,810,315 B1Granted
Vehicle and system of controlling a vehicle transmission
AssigneeFord Global Technologies, LLC
InventorBradley Ronald Heuver
Life of this patent
Estimating the term…
Abstract
A vehicle includes a transmission having a fluid pump, a high pressure fluid circuit, a low pressure fluid circuit, and an accumulator. The vehicle also includes a controller that is programmed to, in response fluid demand exceeding a capacity of the pump, isolate the low pressure circuit from the pump. The controller is also programmed to, in response to vehicle speed exceeding a threshold while the low the pressure circuit is isolated from the pump, discharge the accumulator into the high pressure circuit.
Claims20
A transmission comprising:
- a high pressure fluid circuit that supplies fluid to actuate clutches;
- a low pressure fluid circuit that supplies fluid to clutch pressure balance chambers;
- a pump configured to supply fluid to the high and low pressure fluid circuits;
- a fluid accumulator;
- an output shaft;
- and
- a controller programmed to,
- in response to fluid demand exceeding a capacity of the pump, isolate the low pressure circuit from the pump to prevent starving the high pressure fluid circuit,
- in response to a speed of the output shaft exceeding a threshold while the low the pressure circuit is isolated from the pump, discharge the accumulator into the high pressure circuit, and
- in response to fluid demand decreasing to less than the capacity of the pump, reconnect the low pressure circuit to the pump.
7 more elements
A vehicle comprising:
- a transmission having a fluid pump, a high pressure fluid circuit, a low pressure fluid circuit, and an accumulator;
- and
- a controller programmed to,
- in response fluid demand exceeding a capacity of the pump, isolate the low pressure circuit from the pump, and
- in response to vehicle speed exceeding a threshold while the low the pressure circuit is isolated from the pump, discharge the accumulator into the high pressure circuit.
2 more elements
A method comprising:
- pumping fluid into high and low pressure fluid circuits of a vehicle transmission with a fluid pump;
- and
- discharging fluid from an accumulator into the high pressure circuit in response to vehicle speed exceeding a threshold while the low pressure circuit is isolated from the pump.
Dependencies are inferred from the claim text.