System and method for upshift torque modification using an upstream clutch in a hybrid vehicle
First Claim
1. A hybrid vehicle comprising:
- an engine;
an electric machine connected to the engine by an upstream clutch;
a transmission gearbox connected to the electric machine by a downstream clutch; and
a controller configured to, in response to a commanded upshift of the gearbox, modulate a pressure of the upstream clutch while maintaining a vehicle operation mode, and command the upstream clutch to lock when the upshift is completed.
1 Assignment
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Accused Products
Abstract
A hybrid vehicle has an engine, an electric machine connected to the engine by an upstream clutch, a transmission gearbox connected to the electric machine by a downstream clutch, and a controller. The controller is configured to, in response to a commanded upshift of the gearbox, modulate a pressure of the upstream clutch. A method for controlling a vehicle includes, in response to a commanded upshift of a gearbox, controlling an upstream clutch to a first nonzero speed differential corresponding to a first inertia connected to and upstream of the gearbox to reduce inertia torque during the upshift. A method for controlling a vehicle includes, in response to a commanded upshift of a gearbox when the vehicle is beyond an electrical limit and a fast path torque reduction limit, slipping an upstream clutch and reducing torque outputs of an engine and an electric machine.
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Citations
18 Claims
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1. A hybrid vehicle comprising:
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an engine; an electric machine connected to the engine by an upstream clutch; a transmission gearbox connected to the electric machine by a downstream clutch; and a controller configured to, in response to a commanded upshift of the gearbox, modulate a pressure of the upstream clutch while maintaining a vehicle operation mode, and command the upstream clutch to lock when the upshift is completed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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- 10. A method for controlling a vehicle having an engine selectively coupled to an electric machine by an upstream clutch with the electric machine selectively coupled to a transmission gearbox by a downstream clutch, comprising, in response to a commanded upshift of the gearbox, controlling the upstream clutch to a first nonzero speed differential corresponding to a first inertia connected to and upstream of the gearbox to reduce inertia torque during the upshift and maintaining an operating mode of the vehicle across the upshift.
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16. A method for controlling a vehicle having an electric machine coupled to an engine by an upstream clutch and coupled to a transmission gearbox by a downstream clutch, comprising:
in response to a commanded gearbox upshift when beyond an electrical limit and a fast path torque reduction limit, slipping the upstream clutch, reducing a torque output of the engine, and reducing a torque output of the electric machine while maintaining a vehicle operation mode. - View Dependent Claims (17, 18)
Specification