METHOD FOR INHIBITING ENGINE STALLING IN A HYBRID VEHICLE
First Claim
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1. A method for inhibiting stalling of an engine of a hybrid electric vehicle, the hybrid electric vehicle including a power transfer unit adapted to drive a vehicle wheel and having a plurality of gear ratios and at least one power source adapted to drive the power transfer unit, the method comprising:
- determining whether the engine is running;
determining whether a gear ratio of the power transfer unit is selected; and
implementing a stall mitigation strategy for a predetermined period of time if the engine is running and a gear ratio is selected.
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Abstract
A method for inhibiting stalling of an engine of a hybrid electric vehicle. The method includes determining whether the engine is running, determining whether a gear ratio of a power transfer unit is selected, starting a timer, and implementing a stall mitigation strategy. The stall mitigation strategy is terminated when a predetermined period of time has elapsed.
15 Citations
20 Claims
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1. A method for inhibiting stalling of an engine of a hybrid electric vehicle, the hybrid electric vehicle including a power transfer unit adapted to drive a vehicle wheel and having a plurality of gear ratios and at least one power source adapted to drive the power transfer unit, the method comprising:
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determining whether the engine is running;
determining whether a gear ratio of the power transfer unit is selected; and
implementing a stall mitigation strategy for a predetermined period of time if the engine is running and a gear ratio is selected. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for inhibiting stalling of an engine of a hybrid electric vehicle, the hybrid electric vehicle including a set of power sources that includes the engine and at least one secondary power source, a power transfer unit having a plurality of gear ratios adapted to drive a vehicle wheel, an electrical machine adapted to be powered by at least one member of the set of power sources and coupled to the engine and the power transfer unit, a first signal indicative of an engine speed, and a second signal indicative of a desired gear ratio of the power transfer unit, the method comprising:
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determining whether the engine is running based on the first signal;
determining whether a gear ratio of the power transfer unit is selected based on the second signal;
implementing a stall mitigation strategy to keep the engine speed above a first threshold speed value if the engine is running and a gear ratio of the power transfer unit is selected; and
terminating the stall mitigation strategy if a predetermined period of time has elapsed. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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19. A method for inhibiting stalling of an internal combustion engine of a hybrid electric vehicle due to loading of an engine output shaft, the hybrid electric vehicle including a power transfer unit adapted to drive at least one vehicle wheel and having a plurality of gear ratios, a set of power sources including an engine and at least one voltage source, a starter-alternator coupled to the engine and the power transfer unit and adapted to be powered by at least one member of the set of power sources, and an accelerator pedal, the method comprising:
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determining whether the engine is running;
determining whether a gear ratio has been selected by a vehicle operator;
starting a timer;
implementing a stall mitigation strategy to maintain the engine speed above a first threshold speed value wherein the starter-alternator is powered by the at least one voltage source to provide torque to the engine if a gear ratio has been selected; and
discontinuing the stall mitigation strategy if the engine speed is greater than a second threshold speed value, a predetermined period of time has elapsed, or if the accelerator pedal is actuated. - View Dependent Claims (20)
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Specification