F - Mech Eng,Light,Heat,Weapons – 02 – P
Patent
F - Mech Eng,Light,Heat,Weapons
02
P
123/9, 317/5.35
F02P 5/145 (2006.01) F02P 5/155 (2006.01) F02P 9/00 (2006.01)
Patent
CA 1209197
ABSTRACT OF THE DISCLOSURE Disclosed herein is an internal combustion engine including a rotatable member, a first trigger coil mounted adjacent to the member for generating a first signal which is effective to cause sparking operation of the spark plug at a normal timing, a second trigger coil mounted adjacent to the member in angularly spaced relation to the first trigger coil and operable to generate a second signal which is effective, when the first signal is prevented from causing sparking operation, to cause sparking operation of the spark plug at a retarded timing which is spaced from normal timing at an angular distance equal to the angular spacing between the first and second trigger coils, and a switch coupled to the first trigger coil and operative, in response to engine rotation above a given speed, for preventing operation of the first trigger signal to cause sparking operation, whereby the second signal is effective to cause sparking operation at the retarded timing. In another embodiment, there is provided a circuit operable, in response to engine rotation above a given speed, for producing a spark at a normal timing relative to top dead center and at a retarded timing relative to top dead center and comprising a device for generating a signal having a frequency proportional to engine speed, a component for converting the signal from a frequency mode signal to a potential mode signal, a device for comparing the potential mode signal in relation to an engine revolution reference to produce an output, and mechanism for employing the output to control the timing of the spark.
412963
Foster Leslie W.
Smart & Biggar
LandOfFree
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