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Title: Ignition control device

Abstract

This patent describes an ignition control device for an internal combustion engine, comprising: switching means for on-off controlling a current supply to an ignition coil in synchronism with an engine rotation, current limiting means for detecting a current flowing through the ignition coil to regulate the current to a predetermined value, and means for changing the predetermined value to reduce the current gradually, wherein the changing means comprises an oscillator, a first frequency divider for dividing an output signal frequency of the oscillator by a first integer, a second frequency divider for dividing the output signal frequency of the oscillator by a second integer, the second integer being smaller than the first integer, a clock switching circuit for outputting either of an output of the first frequency divider or an output of the second frequency divider, a counter having an input connected to an output of the clock switching circuit and at least two-digit outputs, the clock switching circuit being responsive to a higher digit output (Q6) of the counter to switch from the first frequency divider to the second frequency divider, a gate responsive to the higher digit output of the counter to pass the lower digit output, amore » digital to analog converter having an input connected to an output of the gate, and an adder for adding an output of the digital to analog converter to an input of the current limiting means.« less

Inventors:
Publication Date:
OSTI Identifier:
6673001
Patent Number(s):
US 4774925
Assignee:
Mitsubishi Denki Kabushiki Kaisha, Tokyo
Resource Type:
Patent
Resource Relation:
Patent File Date: Filed date 5 Jan 1987
Country of Publication:
United States
Language:
English
Subject:
33 ADVANCED PROPULSION SYSTEMS; IGNITION SYSTEMS; CONTROL SYSTEMS; INTERNAL COMBUSTION ENGINES; COUNTING CIRCUITS; CURRENT LIMITERS; ELECTRIC COILS; ELECTRIC CURRENTS; FREQUENCY CONTROL; OSCILLATORS; SWITCHING CIRCUITS; SYNCHRONIZATION; CONTROL; CURRENTS; ELECTRICAL EQUIPMENT; ELECTRONIC CIRCUITS; ELECTRONIC EQUIPMENT; ENGINES; EQUIPMENT; HEAT ENGINES; 330100* - Internal Combustion Engines

Citation Formats

Iwata, T. Ignition control device. United States: N. p., 1988. Web.
Iwata, T. Ignition control device. United States.
Iwata, T. Tue . "Ignition control device". United States.
@article{osti_6673001,
title = {Ignition control device},
author = {Iwata, T},
abstractNote = {This patent describes an ignition control device for an internal combustion engine, comprising: switching means for on-off controlling a current supply to an ignition coil in synchronism with an engine rotation, current limiting means for detecting a current flowing through the ignition coil to regulate the current to a predetermined value, and means for changing the predetermined value to reduce the current gradually, wherein the changing means comprises an oscillator, a first frequency divider for dividing an output signal frequency of the oscillator by a first integer, a second frequency divider for dividing the output signal frequency of the oscillator by a second integer, the second integer being smaller than the first integer, a clock switching circuit for outputting either of an output of the first frequency divider or an output of the second frequency divider, a counter having an input connected to an output of the clock switching circuit and at least two-digit outputs, the clock switching circuit being responsive to a higher digit output (Q6) of the counter to switch from the first frequency divider to the second frequency divider, a gate responsive to the higher digit output of the counter to pass the lower digit output, a digital to analog converter having an input connected to an output of the gate, and an adder for adding an output of the digital to analog converter to an input of the current limiting means.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1988},
month = {10}
}