Ignition system for internal combustion engines

Patent · Tue Jan 27 04:00:00 EST 1987

OSTI ID:6876117

Matsui, T; Takeda, S; Makino, T

An ignition system is described for an internal combustion engine comprising: timing signal detecting means responsive to a rotation speed of an engine to generate a pulse signal including a leading edge and a trailing edge corresponding to an ignition timing and having a predetermined duty cycle; triangular wave generating means for generating a triangular wave voltage synchronized with the trailing edge of the pulse signal; voltage storing means for storing a voltage level of the triangular wave voltage in synchronism with the leading edge of the pulse signal; a voltage divider for dividing the stored voltage in the voltage storing means to generate a reference voltage; comparing means for comparing the reference voltage and the triangular wave voltage to detect a difference therebetween; charging and discharging control means for correcting the stored voltage in the voltage storing means to reduce the difference at the leading edge of the pulse signal to zero; threshold voltage generating means for generating a threshold voltage which is offset from the stored voltage by a voltage value corresponding to a desired dwell time of an ignition coil; and energization control means for controlling a dwell time of the ignition coil in accordance with a result of a comparison between the threshold voltage and the triangular wave voltage.

• Assignee: Nippondenso Co., Ltd., Kariya
• Patent Number(s): US 4638785
• OSTI ID: 6876117
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330100* -- Internal Combustion Engines
CONTROL SYSTEMS
ELECTRIC BATTERIES
ELECTRIC POTENTIAL
ELECTROCHEMICAL CELLS
ELECTRONIC CIRCUITS
ENGINES
HEAT ENGINES
IGNITION SYSTEMS
INTERNAL COMBUSTION ENGINES
MOTION
PULSES
ROTATION
SIGNALS
TIMING CIRCUITS
VELOCITY
VOLTAGE REGULATORS
WAVE PROPAGATION