F - Mech Eng,Light,Heat,Weapons – 02 – P
Patent
F - Mech Eng,Light,Heat,Weapons
02
P
324/14
F02P 17/00 (2006.01) F02P 17/02 (2006.01)
Patent
CA 1050109
ABSTRACT OF THE DISCLOSURE An engine analyzer in which testing apparatus is con- trolled in accordance with a signal generated from voltage pulses applied to the spark plugs, the signal being converted into a square wave voltage of a frequency corresponding to the frequen- cy of occurrence of the ignition voltage pulses. Specifically, this is accomplished by producing a first square wave voltage of one-half the frequency of occurrence of the pulses, integrating this square wave voltage to form a first triangular wave voltage of the same frequency, inverting portions of this first triangu- lar wave voltage to form a triangular wave voltage of the same frequency as the frequency of occurrence of the pulses and dif- ferentiating this further triangular wave voltage to form a square wave voltage of the frequency of occurrence of the pulses. The testing effect is initiated at the end of each first half cycle of the final square voltage so that the testing operation is in- itiated at a time intermediate the times at which successive vol- tage pulses occur.
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