Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1989-12-18
1990-09-25
Wolfe, Willis R.
Internal-combustion engines
Charge forming device
Fuel injection system
123494, 123 73C, F02D 4104, F02M 5100
Patent
active
049586092
ABSTRACT:
A method and apparatus for improving the output torque response of a crankase scavenged, two-stroke engine to a change in throttle position by adjusting the conventional timing of cylinder fuel injection as a function of the position of the throttle and the time rate of change in the throttle position. Preferably, throttle position is measured with a potentiometer connected to the engine air intake throttle, and then filtered with a filter having a first order lag characteristic. Injection timing is advanced based upon a first predetermined schedule as a function of the measured throttle position. The difference between the measured and filtered throttle positions represents an indication of the time rate of change of throttle position and is employed to advance or retard timing in accordance with the second predetermined schedule, depending upon whether the difference is positive or negative, respectively. As a result, a substantially linear relationship is established between the output torque of the engine and the position of the throttle over its entire range of movement, and the amount of time required for the engine to respond to abrupt changes in throttle is reduced.
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Buslepp Kenneth J.
Lillie Cathy C.
Trombley Douglas E.
Wancket Marcel R.
Conkey Howard N.
General Motors Corporation
Wolfe Willis R.
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