Ignition spark timing circuit with switchable hysteresis

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

1979-04-12

1980-12-30

Cox, Ronald B.

Internal-combustion engines

Charge forming device

Fuel injection system

123424, F02P 504

Patent

active

042417082

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 (T.sub.C) 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 (T.sub.N) of the time period of the crankshaft position sensor signal, the comparator output cannot affect the threshold input of the comparator.

REFERENCES:
patent: 3989024 (1976-11-01), Lai
patent: 4016843 (1977-04-01), Porrego
patent: 4020807 (1977-05-01), Del Zotto
patent: 4033272 (1977-07-01), Henrich
patent: 4104997 (1978-08-01), Padgitt
patent: 4125097 (1978-11-01), Gunderson
patent: 4170209 (1979-10-01), Petrie

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