Methods and systems for assisted direct start control
First Claim
1. A method of pressurizing a hydraulic circuit comprising a hydraulically actuated transmission component and an accumulator, comprising, during an engine idle-stop,adjusting actuation of the hydraulically actuated transmission component over a duration;
- during the duration, isolating the accumulator from the hydraulically actuated transmission component when a pressure in the hydraulic circuit is above a threshold; and
during the duration, coupling the accumulator into the hydraulic circuit when the pressure is below the threshold.
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Accused Products
Abstract
Methods and systems are provided for pressurizing a hydraulic circuit comprising a hydraulically actuated transmission component and an accumulator. One example method comprises, during an engine idle-stop, adjusting actuation of the hydraulically actuated transmission component over a duration. The method further comprises, during the duration, isolating the accumulator from the hydraulically actuated transmission component when a pressure in the hydraulic circuit is above a threshold, and coupling the accumulator into the hydraulic circuit when the pressure is below the threshold.
14 Citations
17 Claims
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1. A method of pressurizing a hydraulic circuit comprising a hydraulically actuated transmission component and an accumulator, comprising, during an engine idle-stop,
adjusting actuation of the hydraulically actuated transmission component over a duration; -
during the duration, isolating the accumulator from the hydraulically actuated transmission component when a pressure in the hydraulic circuit is above a threshold; and during the duration, coupling the accumulator into the hydraulic circuit when the pressure is below the threshold. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of pressurizing a clutch hydraulic circuit comprising a hydraulically actuated transmission component, and an accumulator, the clutch hydraulic circuit coupled to a transmission mechanical pump, the method comprising,
during an engine idle-stop, isolating the clutch hydraulic circuit from the pump; -
maintaining the transmission component in gear by maintaining a transmission clutch applied; isolating the accumulator from the transmission component when a pressure in the clutch hydraulic circuit is above a threshold; and coupling the accumulator to the transmission component when the pressure is below the threshold. - View Dependent Claims (8, 9, 10, 11)
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12. A vehicle system, comprising:
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an engine that is selectively deactivated during idle-stop conditions; an automatic transmission comprising a hydraulically actuated transmission component and a mechanical transmission pump; an accumulator; a clutch hydraulic circuit including the transmission component and the accumulator; a pressure sensor configured to estimate a pressure in the clutch hydraulic circuit; a control system configured to; during an engine idle-stop, isolate the clutch hydraulic circuit from the transmission pump; adjust an actuation of the transmission component over a duration; and during the duration, couple the accumulator to the transmission component when a pressure in the isolated clutch hydraulic circuit is below a threshold; and
isolate the accumulator from the transmission component when the pressure is above the threshold. - View Dependent Claims (13, 14, 15, 16, 17)
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Specification