Method and system for engine control
First Claim
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1. A method of operating a vehicle including an engine, a motor, and a control system, comprising:
- via the control system;
determining a seasonal grade of fuel in a fuel tank of the vehicle relative to a current season of vehicle operation, andadjusting an engine fuel injection amount based on the determined seasonal grade of fuel in the fuel tank.
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Abstract
Methods and systems are provided for adjusting operation of a plug-in hybrid electric vehicle responsive to a seasonal grade of the fuel available in the vehicle'"'"'s fuel tank. If the seasonal grade of fuel in the fuel tank does not correspond to the seasonal grade of fuel mandated during the time of engine operation, a fuel injection amount is adjusted to compensate for differences between seasonal grades of a fuel.
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Citations
20 Claims
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1. A method of operating a vehicle including an engine, a motor, and a control system, comprising:
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via the control system;
determining a seasonal grade of fuel in a fuel tank of the vehicle relative to a current season of vehicle operation, andadjusting an engine fuel injection amount based on the determined seasonal grade of fuel in the fuel tank. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of operating a vehicle including an engine, a motor, and a control system, comprising:
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via the control system;
during a first condition, when the control system determines that an estimated fuel age is higher than a threshold, operating the engine while injecting a first, larger amount of fuel;during a second condition, when the control system determines that the estimated fuel age is higher than the threshold, operating the engine while injecting a second, smaller amount of fuel; wherein the threshold is adjusted based on a determined season of vehicle operation, and the threshold is increased during a determined summer season and decreased during a determined winter season. - View Dependent Claims (12, 13, 14, 15)
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16. A vehicle system, comprising:
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an engine; an electric motor; a fuel tank including a fuel level sensor for providing fuel to the engine; an auxiliary system including a clock; a control system with computer readable instructions for; inferring a seasonal grade of fuel based on an estimated age of the fuel; and adjusting an engine fuel injection amount based on the seasonal grade of the fuel relative to a current season of vehicle operation. - View Dependent Claims (17, 18, 19, 20)
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Specification