METHODS AND SYSTEM FOR MITIGATING ENGINE AND MOTOR TORQUE DISTURBANCES OF A HYBRID VEHICLE
First Claim
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1. A powertrain operating method, comprising:
- during engine run-up from cranking speed to a desired speed before a driveline disconnect clutch coupled to an engine is fully closed, commanding an engine torque to first torque bounded by a lower limit and an upper limit, the lower limit and the upper limit based on an accelerator pedal position.
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Abstract
Systems and methods for operating a transmission of a hybrid powertrain that includes a motor/generator are described. The systems and methods may improve engine starting during engine starts where little or larger driver demand torques are requested. In one example, engine torque may be commanded to a torque based on a filtered driver demand torque, the filtered driver demand torque filtered based on a position of an accelerator pedal.
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Citations
20 Claims
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1. A powertrain operating method, comprising:
during engine run-up from cranking speed to a desired speed before a driveline disconnect clutch coupled to an engine is fully closed, commanding an engine torque to first torque bounded by a lower limit and an upper limit, the lower limit and the upper limit based on an accelerator pedal position. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A powertrain operating method, comprising:
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during engine run-up from cranking speed to a desired speed before a driveline disconnect clutch coupled to an engine is fully closed, commanding an engine torque to first torque bounded by a lower limit and an upper limit; commanding engine torque to a predetermined torque during closing of the driveline disconnect clutch; and commanding engine torque to a driver demand torque including commanding the engine to a filtered driver demand torque in response to the driveline disconnect clutch being fully closed. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
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15. A system, comprising:
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an engine; a motor/generator; a disconnect clutch positioned in a powertrain between the engine and the motor; a transmission coupled to the motor/generator; and a controller including executable instructions stored in non-transitory memory for commanding an engine torque and a motor torque during engine starting to a time when motor torque is zero or less than zero and engine torque is equal to or greater than a driver demand torque, the engine torque commanded based on a rate filtered driver demand torque that reduces a rate of engine torque increase for accelerator pedal positions less than a threshold and increases the rate of engine torque increase for accelerator pedal positions greater than the threshold. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification