Method and apparatus for controlling an ignition timing

Patent · Tue Sep 01 04:00:00 EDT 1981

OSTI ID:5741366

Kobayashi, A; Kondo, T; Sagisaka, Y

An apparatus for controlling an ignition timing of an internal combustion engine for each ignition cycle is disclosed. The apparatus fetches digital signals representing an intake pipe negative pressure and the number of revolutions of the internal combustion engine, and a digital signal representing a fuel injection time, and computes a basic timing of ignition spark by using the intake pipe negative pressure and the number of revolutions. When the intake pipe negative pressure and the number of revolutions, both being sensed currently, have ratios of changes falling within given values, compared with those sensed precedingly, correction values read out from a memory device on the basis of the intake pipe negative pressure and the number of revolutions are corrected so as to reduce the fuel injection time in accordance with the result of a comparison of the fuel injection time of the fuel injection currently performed with that of the fuel injection precedingly performed. An ignition timing is determined by correcting the basic ignition timing depending on the corrected correction value of the ignition timing. The corrected correction value is loaded into the memory device in place of the correction value before correction. When the intake pipe negative pressure and the number of revolutions, both being sensed currently, changes with ratio which falls out of fixed values, compared with those sensed precedingly, the basic ignition timing is corrected by the correction value of ignition timing read out on the basis of the intake pipe negative pressure and the number of revolutions, without correcting by the fuel injection time, thereby to determine an ignition timing. An ignition signal is applied to an internal combustion engine igniting device in accordance with the ignition timing determined.

• Assignee: Nippondenso Co Ltd (Japan)
• Patent Number(s): US 4286560
• OSTI ID: 5741366
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330100* -- Internal Combustion Engines
CONSUMPTION RATES
CONTROL SYSTEMS
DIGITAL SYSTEMS
ELECTRONIC CIRCUITS
ELECTRONIC EQUIPMENT
ENERGY CONSUMPTION
ENGINES
EQUIPMENT
FEEDBACK
FUEL CONSUMPTION
FUEL ECONOMY
HEAT ENGINES
IGNITION SYSTEMS
INTERNAL COMBUSTION ENGINES
SIGNALS
TIMING CIRCUITS