Detection of engine speed in response to ignition operation

Details Detection of engine speed in response to ignition operation Detection of engine speed in response to ignition operation

1978-05-17

1981-02-10

Strecker, Gerard R.

Electricity: measuring and testing

Electrical speed measuring

Including speed-related frequency generator

123643, G01P 3481, F02P 100

Patent

active

042504503

ABSTRACT:
A system for detecting rotational frequency of engine which comprises a switching device including a switching transistor for switching on and off the flow of current to the ignition coil of an internal combustion engine and a current limiting circuit for limiting the flow of current to the switching transistor to a predetermined value, and a speed detecting circuit connected to the junction of the ignition coil and the switching transistor. The speed detecting circuit is designed so that it has a threshold value voltage which is higher than the collector voltage of the switching transistor produced on limitation of current flow and which varies in response to the power supply voltage, and a signal is generated when the voltage at the junction of the ignition coil and the switching transistor exceeds the threshold value voltage, thus generating an output signal in synchronism with the spark ignition timing irrespective of variation in the supply voltage and thereby accurately detecting the engine speed irrespective of variation in the supply voltage.

REFERENCES:
patent: 3363615 (1968-01-01), Meyerle
patent: 3605713 (1971-09-01), Le Masters et al.
patent: 3924595 (1975-12-01), Brungsberg

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