Fuel supply system for engine warm-up
AssigneeWalbro Corporation
InventorsHiroki Ogasawara, Tsuyoshi Watanabe
Life of this patent
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Abstract
In at least one implementation, a method of operating a combustion engine, includes determining a temperature equal or related to a temperature of an engine at an engine start and comparing the determined temperature to a temperature threshold, determining if an engine operating condition exceeds an engine threshold within a threshold time after the engine was started, and if the determined temperature is below the threshold temperature and the engine operating condition remains above the engine threshold and the threshold time has not passed, providing an enriched fuel and air mixture to the engine.
Claims18
A method of operating a combustion engine, comprising:
- comparing a determined temperature, that is equal or related to a temperature of the engine at an engine start, to a temperature threshold;
- determining engine speed and comparing the engine speed to a threshold speed;
- determining if a time since the engine was started is less than a threshold time, where the threshold time is set as a function of the determined temperature;
- and
- if the determined temperature is below the threshold temperature and the engine speed is above the threshold speed, and the time since the engine was started is less than the threshold time, providing an enriched fuel and air mixture to the engine.
A method of operating a combustion engine, comprising:
- determining a temperature equal or related to a temperature of the engine at an engine start and comparing the determined temperature to a temperature threshold;
- determining if an engine operating condition exceeds an engine threshold within a threshold time after the engine was started;
- and
- if the determined temperature is below the threshold temperature and the engine operating condition remains above the engine threshold and the threshold time has not passed, providing an enriched fuel and air mixture to the engine, wherein the step of providing an enriched fuel and air mixture includes opening a valve associated with a charge forming device to provide additional fuel into a fuel and air mixture provided from the charge forming device than is provided when the valve is closed, wherein the valve is selectively opened and closed during the threshold time when the engine speed is greater than a speed threshold, and wherein the valve is repeatedly opened for a first period of time and closed the remainder of the time within the threshold time.
Dependencies are inferred from the claim text.