Methods and systems for engine starting during a shift
First Claim
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1. A method of starting an engine of a vehicle with a hybrid vehicle driveline, comprising:
- predicting a desired torque after a transmission upshift;
starting rotation of a stopped engine based on the predicted desired torque after the transmission upshift compared with a threshold amount of torque,wherein the vehicle driveline further comprises a driveline integrated starter/generator (DISG) coupled to a disconnect clutch at one side and a transmission component at an opposite side; and
operating the driveline in a sailing mode with the engine combusting and the disconnect open and the DISG providing requested torque to the vehicle driveline.
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Abstract
Systems and methods for improving operation of a hybrid vehicle are presented. In one example, torque demand of a driveline after a shift is forecast to determine if it is desirable to start the engine early so that engine torque is available after the shift. The approach may improve vehicle torque response.
69 Citations
20 Claims
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1. A method of starting an engine of a vehicle with a hybrid vehicle driveline, comprising:
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predicting a desired torque after a transmission upshift; starting rotation of a stopped engine based on the predicted desired torque after the transmission upshift compared with a threshold amount of torque, wherein the vehicle driveline further comprises a driveline integrated starter/generator (DISG) coupled to a disconnect clutch at one side and a transmission component at an opposite side; and operating the driveline in a sailing mode with the engine combusting and the disconnect open and the DISG providing requested torque to the vehicle driveline. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of starting an engine, comprising:
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providing a torque to a hybrid vehicle driveline with a disconnect clutch via an electric machine; scheduling a transmission upshift of a multi-clutch automatic transmission, the multi-clutch transmission comprising an automatically operated manual transmission; starting rotation of a stopped engine in response to the scheduled transmission upshift if a desired torque after the scheduled transmission upshift is greater than a threshold amount of torque, and where the desired torque is based on driveline integrated starter/generator torque after a transmission upshift timing, where the electric machine is a driveline integrated starter/generator (DISG); and operating the driveline in a sailing mode with the engine combusting and the disconnect open and the DISG providing requested torque to the vehicle driveline. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A hybrid vehicle system, comprising:
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an engine; a dual mass flywheel including a first side mechanically coupled to the engine; a driveline disconnect clutch mechanically including a first side coupled to a second side of the dual mass flywheel; a driveline integrated starter/generator (DISG) mechanically including a first side coupled to a second side of the driveline disconnect clutch; and a controller including non-transitory instructions executable to start the engine via closing the driveline disconnect clutch in response to a desired torque after a scheduled transmission upshift, the engine started before the transmission shifts in response to the scheduled transmission upshift, and to operate the driveline in a sailing mode with the engine combusting and the disconnect open and the DISG providing requested torque to the vehicle driveline. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification