Electronic spark advance-type ignition system
An electronic spark advance-type ignition system is described for an internal combustion engine comprising: an ignition coil; a magnetic pickup for generating a pair of pulse signals with a time interval therebetween substantially corresponding to a maximum advance angle in terms of crankshaft rotation degrees for each rotation of a crankshaft of the engine; signal generating means responsive to the pair of pulse signals for the pickup for generating a pair of comparison signals of different levels within each of the crankshaft rotation degrees of the maximum advance angle and the other crankshaft rotation degrees; and control means for comparing the signal levels of each of the pairs of comparison signals to generate an energization starting position signal and an ignition timing determining ignition position signal for the ignition coil, the signal generating means including means for controlling the waveform of one of the pair of comparison signals so that the ignition position signal is advanced in angle with respect to the energization starting position signal. The energization starting position signal is generated under all conditions prior to the timing of generation of the earlier one of the next pair of pulse signals generated from the pickup. The ignition position signal is generated within the maximum advance angle at a point in time following generation of the earlier one of the next pair of pulse signals by at least a predetermined amount.
- Assignee:
- Hitachi, Ltd., Tokyo
- Patent Number(s):
- US 4627398
- OSTI ID:
- 7226173
- Resource Relation:
- Patent File Date: Filed date 28 Nov 1984
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
SPARK IGNITION ENGINES
IGNITION SYSTEMS
ELECTRIC COILS
INCIDENCE ANGLE
MAGNETS
PULSES
ROTATION
SHAFTS
SIGNALS
START-UP
TIME DEPENDENCE
TIMING PROPERTIES
WAVE FORMS
ELECTRICAL EQUIPMENT
ENGINES
EQUIPMENT
HEAT ENGINES
INTERNAL COMBUSTION ENGINES
MACHINE PARTS
MOTION
330101* - Internal Combustion Engines- Spark-Ignition