Oil dilution estimation and mitigation control in a fuel injected engine
AssigneeToyota Jidosha Kabushiki Kaisha
InventorTomoyuki Kittaka
Life of this patent
Estimating the term…
Abstract
A control device for an engine includes an electronic control unit configured to estimate a water content mixed in engine oil based on a history of a fuel injection amount during an operation of the engine and restrain freezing of water such that, when the water content thus estimated is a predetermined amount or more, the electronic control unit increases a mixing amount of the fuel into the engine oil as compared with a case where the water content thus estimated is less than the predetermined amount. The control device estimates the water content mixed in the engine oil as a function of an integrated value of water content while an oil temperature of the engine is less than a predetermined temperature.
Claims8
A control device for an engine configured to use a fuel containing alcohol, the control device comprising:
- electronic control circuitry programmed to
- i) estimate a water content mixed in engine oil based on a history of a fuel injection amount during an operation of the engine, and
- ii) when an estimated water content is equal to or larger than a predetermined amount, increase a mixing amount of the fuel into the engine oil as compared with a case where the estimated water content is smaller than the predetermined amount such that freezing of water is restrained, wherein
- the electronic control circuitry is programmed to estimate the water content mixed in the engine oil as a function of an integrated value of water content while an oil temperature of the engine is less than a predetermined temperature.
A control device for an engine configured to use a fuel containing alcohol, the control device comprising:
- water content estimation means for estimating a water content mixed in engine oil based on a history of a fuel injection amount during an operation of the engine;
- and
- freezing restraint means for, when an estimated water content is equal to or larger than a predetermined amount, increasing a mixing amount of the fuel into the engine oil as compared with a case where the estimated water content is smaller than the predetermined amount such that freezing of water is restrained, wherein
- the freezing restraint means estimates the water content mixed in the engine oil as a function of an integrated value of water content while an oil temperature of the engine is less than a predetermined temperature.
Dependencies are inferred from the claim text.