Control system for engine operation using two fuels of different volatility
AssigneeFord Motor Company
InventorsRichard J. Wineland, Roberta J. Nichols, Eric L. Clinton
Life of this patent
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Abstract
A method for controlling the amount of fuel mixture, including a first and second fuel of different volatility, to be supplied to an internal combustion engine includes calculating a base amount of fuel mixture needed to achieve a desired air to fuel ratio at a predetermined engine operating condition. Such a base amount of fuel mixture is modified as a function of the temperature of the internal combustion engine and is a function of the percentage of the first fuel.
Claims4
A method for controlling the amount of a fuel mixture, including a first and second fuel of different volatility, to be supplied to an internal combustion engine during both open loop and closed loop operation, said method including the steps of:
- determining the amount of air charge per intake stroke of the internal combustion engine;
- determining the percentage of the first fuel in the fuel mixture;
- calculating a stoichiometric air to fuel ratio of the fuel mixture based on the percentage of the first fuel in the fuel mixture;
- calculating a base amount of fuel mixture needed to achieve the stoichiometric air to fuel ratio at a predetermined engine operating condition using the calculated stoichiometric air to fuel ratio and the amount of air charge;
- and
- modifying the above calculated base amount of fuel mixture needed to achieve the stoichiometric air to fuel ratio as a function of the engine coolant temperature of the internal combustion engine, engine speed and as a function of the percentage of the first fuel.
Dependencies are inferred from the claim text.