Current flowing time period control system for ignition coil of internal combustion engine

Patent · Tue Sep 27 00:00:00 EDT 1988

OSTI ID:6629708

Narita, K; Toyama, K; Matsui, T

This patent describes a current flowing time period control system for an ignition coil of an internal combustion engine, comprising: a power transistor for supplying and interrupting a primary current of the ignition coil, a circuit for detecting the rise of the primary current of the ignition coil to a value 1/n wherein n>1, of the desired interruption current value, a current flowing time period setting circuit including accumulation means in which the accumulated amount changes gradually at a first rate in one direction until the rise of the primary current of the ignition coil to 1/n of the desired interruption current value is detected, changes at a second rate in the other direction gradually at an ignition timing, and then changes in the original direction again at a third rate 1/n of the first rate, wherein the time period n times longer than the time period required for the rise of the primary current of the ignition coil to 1/n of the desired interruption current value is set as the primary current flowing time period for the next ignition cycle in accordance with the accumulated amount of the accumulation means, and a drive circuit for driving the power transistor in accordance with the primary current flowing time period set by the current flowing time period setting circuit.

• Assignee: Nippondenso Co., Ltd., Kariya
• Patent Number(s): US 4773380
• OSTI ID: 6629708
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330100* -- Internal Combustion Engines
99 GENERAL AND MISCELLANEOUS
990220 -- Computers
Computerized Models
& Computer Programs-- (1987-1989)
COMPUTERIZED CONTROL SYSTEMS
CONTROL SYSTEMS
CURRENTS
DETECTION
ELECTRIC CURRENTS
ELECTRONIC CIRCUITS
ENGINES
HEAT ENGINES
IGNITION SYSTEMS
INTERNAL COMBUSTION ENGINES
METERING
TIMING PROPERTIES