Ignition timing control system for internal combustion engines
An ignition timing control system is described for an internal combustion engine having an ignition circuit, an ignition coil, and a spark plug, for applying a trigger signal to the ignition circuit which, in response to the trigger signal, applies a high-voltage pulse to the ignition coil for driving the spark plug. The system comprises: pulse generating means for generating first and second timing pulses corresponding to respective predetermined crank angles of the engine; a first sawtooth wave generating circuit which receives the first and second timing pulses from the pulse generating means for generating a first sawtooth signal of a predetermined slope in synchronism with a leading edge of the second timing pulse; and a second sawtooth wave generating circuit which receives the first and second timing pulses from the pulse generating means for generating a second sawtooth signal. The signal rises generally vertically at a leading edge of the first timing pulse, decays generally vertically at the leading edge of the second timing pulse, and rises between the leading edges of the first and second timing pulses at a slope greater than the predetermined slope of the first sawtooth signal.
- Assignee:
- Honda Giken Kogyo Kabushiki Kaisha, Tokyo
- Patent Number(s):
- US 4643150
- OSTI ID:
- 6739747
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
330101* -- Internal Combustion Engines-- Spark-Ignition
COMPARATOR CIRCUITS
CONTROL SYSTEMS
ELECTRIC COILS
ELECTRICAL EQUIPMENT
ELECTRONIC CIRCUITS
ELECTRONIC EQUIPMENT
ENGINES
EQUIPMENT
FUNCTION GENERATORS
HEAT ENGINES
IGNITION SYSTEMS
INTERNAL COMBUSTION ENGINES
PULSE GENERATORS
PULSES
SIGNALS
SPARK IGNITION ENGINES
SYNCHRONIZATION
TIMING CIRCUITS