Importance

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Abstract

In controlling fuel injection and ignition timing in an internal combustion engine operating on a fuel mixture, such as gasoline and methanol, consideration must be given to the mixture ratio of the fuel mixture in determining air/fuel ratio and ignition timing, as well as in controlling the atomizing of the injected fuel. Fuel injection time is determined in accordance with air/fuel ratio, which is calculated in accordance with the expression A/F=14.8-0.0853P for a fuel mixture of gasoline and methanol, where P is the mixture ratio of methanol. In addition, to enhance cold start performance, a droplet size of injected fuel below 100.mu. is desired, and this may be achieved using a heating element whose surface temperature is controlled in accordance with the mixture ratio P or by injecting compressed air with the injected fuel in an amount determined by the mixture ratio P, or both. In the alternative, an ultrasonic fuel injector may be employed whose frequency is controlled in accordance with the mixture ratio P.

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First Claim