Ignition spark timing circuit with switchable hysteresis

Details Ignition spark timing circuit with switchable hysteresis Ignition spark timing circuit with switchable hysteresis

F - Mech Eng,Light,Heat,Weapons

02

P

317/5.35

F02P 5/14 (2006.01) F02P 5/155 (2006.01) F02B 75/02 (2006.01)

Patent

CA 1130367

-1- Abstract An ignition spark timing circuit with switchable hysteresis for an internal combustion engine is disclosed. A crankshaft sensor produces a periodic input sensor signal, having a predetermined period, which initiates the action of a programmable voltage slope generator that produces a predeterminedly varying signal. This varying signal serves as an input to a comparator which also receives a switching threshold input, and the comparator output is utilized to determine the time occurrence of spark ignitions. A switchable feedback path is provided between the output of the comparator and its switching threshold input such that hysteresis for the comparator threshold input is provided during critical portions (TC) of the time period of the crankshaft position sensor signal when the comparator is expected to produce output signal transitions that determine the occurrence of spark ignitions. At other portions (TN) of the time period of the crankshaft position sensor signal, the comparator output cannot affect the threshold input of the comparator.

346567

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