METHODS AND SYSTEMS FOR IMPROVING HYBRID VEHICLE TRANSMISSION SHIFTING
First Claim
Patent Images
1. A driveline method, comprising:
- in response to a transmission gear shift request, increasing transmission input shaft torque via an electric machine when electric machine speed is less than a threshold speed during a torque phase of the transmission gear shift; and
decreasing transmission input shaft torque via slipping a driveline disconnect clutch and reducing output torque of the electric machine during an inertia phase of the transmission gear shift.
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Abstract
Systems and methods for improving hybrid vehicle shifting are presented. Specifically, torque supplied to an input shaft of a transmission may be adjusted during torque and inertia phases of a transmission gear shift. The torque supplied to the transmission input shaft may be increased or decreased based on the shift and the shift phase.
8 Citations
20 Claims
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1. A driveline method, comprising:
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in response to a transmission gear shift request, increasing transmission input shaft torque via an electric machine when electric machine speed is less than a threshold speed during a torque phase of the transmission gear shift; and decreasing transmission input shaft torque via slipping a driveline disconnect clutch and reducing output torque of the electric machine during an inertia phase of the transmission gear shift. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A driveline method, comprising:
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in response to a transmission gear shift request, decreasing transmission input shaft torque via an electric machine without slipping a driveline disconnect clutch during a torque phase of the transmission gear shift; and increasing transmission input shaft torque via slipping a driveline disconnect clutch during an inertia phase of the transmission gear shift. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A driveline system, comprising:
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an engine; an electric machine; a driveline disconnect clutch selectively coupling the engine and the electric machine; a transmission mechanically coupled to the electric machine; and a controller including executable instructions stored in non-transitory memory for slipping the driveline disconnect clutch in response to entering an inertia phase of a gear shift of the transmission. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification