F - Mech Eng,Light,Heat,Weapons – 02 – D
Patent
F - Mech Eng,Light,Heat,Weapons
02
D
341/38.11
F02D 3/00 (2006.01) F02D 41/04 (2006.01) F02D 41/34 (2006.01) F02M 51/00 (2006.01) F02B 75/02 (2006.01) F02B 75/12 (2006.01)
Patent
CA 2028412
C-4186 FUEL INJECTION TIMING CONTROL FOR A CRANKCASE SCAVENGED TWO-STROKE ENGINE Abstract of the Disclosure A method and apparatus for improving the output torque response of a crankcase 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.
Buslepp Kenneth J.
Lillie Cathy C.
Trombley Douglas E.
Wancket Marcel R.
Buslepp Kenneth J.
General Motors Corporation
Gowling Lafleur Henderson Llp
Lillie Cathy C.
Trombley Douglas E.
LandOfFree
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