| 摘要 |
A vehicle propulsion system and a method of its operation are described. As one example, the vehicle propulsion system includes a plug-in hybrid electric vehicle. The method may include: producing a motor output by selectively operating the motor to consume electrical energy stored on-board the vehicle; producing an engine output by selectively operating the engine to consume fuel stored on-board the vehicle; and increasing consumption of the fuel by the engine relative to consumption of the electrical energy by the motor as a residence time of the fuel stored on-board the vehicle increases. The residence time of the fuel stored on-board the vehicle can provide an indication of fuel degradation, enabling the duty cycle of the engine to be selectively increased to enforce fuel use conditions, particularly in the context of a plug-in hybrid electric vehicle where fuel use may be less frequent.
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