Circuit for generating a sawtooth engine crank angle signal and

Details Circuit for generating a sawtooth engine crank angle signal and Circuit for generating a sawtooth engine crank angle signal and

1975-01-30

1978-07-25

Myhre, Charles J.

Internal-combustion engines

Intake manifold

Manifold tuning, balancing or pressure regulating means

123148E, F02P 504

Patent

active

041023110

ABSTRACT:
An integrator circuit is reset at predetermined engine crank angles to develop a sawtooth waveform representing engine crank angle. A comparator circuit, including an adjustable, voltage source output, is connected in a closed feedback loop around the integrator to regulate the peak of the sawtooth to a predetermined magnitude which is independent of engine speed, and, hence, independent of the sawtooth frequency. The analog output of the comparator represents engine speed. An adjustable calibration resistor in the integrator adjusts the integrator output to secure a desired relationship between the output of the comparator circuit and the frequency of the sawtooth. The complete circuit requires only two operational amplifiers and a small number of passive circuit elements.

REFERENCES:
patent: 3202146 (1965-08-01), Short
patent: 3592178 (1971-07-01), Schiff
patent: 3749070 (1973-07-01), Oishi et al.
patent: 3811420 (1974-05-01), Vogel
patent: 3867916 (1975-02-01), Bigalke
patent: 3874351 (1975-04-01), Asler et al.
patent: 3885534 (1975-05-01), Webster
patent: 3885720 (1975-05-01), Brennan
patent: 3910243 (1975-10-01), Gau et al.
Del Toro and Parker; Principles of Control Systems Engineering, 1960, pp. 545-548, 572.

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