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US 4,380,980 AGranted
Ignition spark timing circuit
AssigneeMotorola, Inc.
InventorRupin J. Javeri
Life of this patent
Estimating the term…
Abstract
The circuit determines which cylinder is to be fired and continually updates the determination so that the circuit recovers immediately from any false detect and responds to any change of engine condition. The dwell timing is derived from sensors adjacent the flywheel and, to achieve the widest possible range of advance angles, the use of certain sensor-derived signals is delayed until after spark.
Claims8
An ignition spark timing circuit comprising:
- first circuit means for providing first and second control signals, each in response to engine crankshaft rotation;
- second circuit means for providing a spark enabling signal;
- third circuit means for providing a switching signal having two values in response to crankshaft velocity being above or below a predetermined velocity;
- fourth circuit means including latching means coupled to be set by the spark enabling signal and reset by the first control signal delayed, and providing a spark detect output signal;
- fifth circuit means for providing a dwell control signal;
- and
- sixth circuit means for providing a dwell enabling signal, the sixth circuit means controlled by the switching signal to enable dwell in response to the first control signal and to disenable dwell in response to the second control signal at engine velocities below the predetermined velocity, and to enable dwell in response to the dwell control signal and disenable dwell in response to the spark detect signal at velocities higher than the predetermined velocity.
4 more elements
An ignition spark timing circuit having multiple outputs and receiving signals related to engine crankshaft rotation, the circuit comprising:
- first circuit means for providing a control signal and a synchronizing signal in response to the received signals;
- second circuit means for providing a dwell control signal in response to at least one engine condition;
- third circuit means coupled to the second circuit means for providing a spark enabling signal;
- fourth circuit means for sequentially switching the dwell control signal to ones of the multiple outputs;
- and
- fifth circuit means coupled to the first circuit means, the third circuit means and the fourth circuit means, for latching the synchronizing signal and gating said signal to the fourth circuit means in response to at least one signal relating to the spark enabling signal.
3 more elements
Dependencies are inferred from the claim text.