Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1992-11-05
1994-07-05
Nelli, Raymond A.
Internal-combustion engines
Charge forming device
Fuel injection system
123 1A, F02M 5100
Patent
active
053258363
ABSTRACT:
An electronic engine control system for use with differing fuel types, such as gasoline, methanol and mixtures of the two, controls engine operating parameters such as the fuel/air ratio and ignition timing in response to fuel-type indications generated by a fuel type sensor positioned on the fuel line. Changes in the fuel type passing the sensor result in variations in the engine control signals which are effective after a variable delay period elapses. The duration of the variable delay period is altered in response to changes in fuel pump voltage and fuel temperature to form a better estimate of the transport delay experienced by the fuel as it passed from the fuel-type sensor to the engine's fuel intake. A microcontroller delays the control signal changes by retrieving a count value from a two-dimensional lookup table indexed by values reflecting pump voltage and fuel temperature. The count value is placed in a countdown timer which is decremented to zero for establishing a subinterval, at the conclusion of which the current fuel type signal is pushed into a FIFO stack as the oldest stored fuel type value is popped from the stack and supplied to the engine controller. In this way, the stack operates as a variable duration delay device which is updated at the end of subintervals each having a duration dependent upon the estimated fuel transport delay.
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Boruta William E.
Curran Judith M.
Orzel Daniel V.
Ford Motor Company
Lippa Allan J.
May Roger L.
Nelli Raymond A.
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