Transducer circuits for providing pulses whose widths are repres

Details Transducer circuits for providing pulses whose widths are repres Transducer circuits for providing pulses whose widths are repres

1975-03-17

1976-12-14

Miller, Jr., Stanley D.

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307265, 307273, 123 32EA, 123117R, 123140R, 331 65, H03K 326, F02P 504, F02B 300

Patent

active

039978010

ABSTRACT:
An electronic engine spark timing controller contains a throttle position transducer circuit and an intake manifold vacuum transducer circuit which provide respective signals representing the throttle position and the magnitude of intake manifold vacuum. Each of these two circuits contains a novel configuration of electronic circuit elements to develop an output electrical waveform composed of repetitive pulses each of which has a pulse width representative of the corresponding mechanical input signal which is supplied to the circuit via a transducer in the form of a coil whose inductance is varied in accordance with the mechanical input signal. The coil in each transducer circuit forms a portion of an RL type monostable circuit which exhibits an electrical transient when triggered. Both transducer circuits are triggered from a free-running pulse generator which is set to generate pulses at a fixed frequency. The pulse width of the trigger pulses used to trigger the transducer circuits is appreciably less than the pulse width of the output pulses of the transducer circuits, and each transducer circuit contains a feedback circuit which, when the monostable has been triggered by a pulse from the pulse generator, enables the electrical transient generated therein to continue. The output signals are used in conjunction with additional circuitry to provide spark timing control for the engine.

REFERENCES:
patent: 3338221 (1967-08-01), Scholl
patent: 3430616 (1969-03-01), Glockler et al.
patent: 3474332 (1969-10-01), Brown
patent: 3483851 (1969-12-01), Reichardt
patent: 3566846 (1971-03-01), Glockler

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