METHODS AND SYSTEMS FOR STARTING AN ENGINE
First Claim
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1. A method for a hybrid vehicle, comprising:
- during an engine restart,cranking an engine via a motor with a disconnect clutch between the engine and the motor at least partially disengaged while delaying fueling of the engine until only after an engine speed is above a threshold speed and a direction of engine rotation is positive for greater than a threshold duration.
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Abstract
Methods and systems are provided for improving engine restart operations in a hybrid vehicle. While an engine is cranked via motor torque, engine fueling is delayed until the engine speed is sufficiently high and the engine has been rotating in a forward direction continuously for a threshold duration. A disconnect clutch between the engine and motor is slipped while the engine cranks, the clutch engaged only after the engine has run up to the motor speed.
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Citations
20 Claims
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1. A method for a hybrid vehicle, comprising:
during an engine restart, cranking an engine via a motor with a disconnect clutch between the engine and the motor at least partially disengaged while delaying fueling of the engine until only after an engine speed is above a threshold speed and a direction of engine rotation is positive for greater than a threshold duration. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for a hybrid vehicle, comprising:
during an engine restart, slipping a disconnect clutch between an engine and a motor while cranking the engine unfueled via the motor; resuming fueling of the engine only after an engine speed is above a threshold speed and engine acceleration is indicative of positive engine rotation; and adjusting engine torque responsive to a predicted motor synchronous speed. - View Dependent Claims (13, 14, 15, 16, 17)
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18. A vehicle system, comprising:
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an electric motor; an engine; a disconnect clutch coupled in a driveline between the engine and the motor; vehicle wheels configured to receive propulsion power from one or more of the engine electric motor and the engine via the driveline; and a controller including non-transitory executable instructions for; receiving an engine restart request; and in response to the restart request, cranking the engine via the motor with the disconnect clutch at least partially disengaged while delaying fueling of the engine until each of an engine speed is above a first threshold speed and a direction of engine rotation is positive for greater than a threshold duration. - View Dependent Claims (19, 20)
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Specification