Fuel control system for cylinder injection type internal combust

Details Fuel control system for cylinder injection type internal combust Fuel control system for cylinder injection type internal combust

1997-11-12

1999-03-09

Miller, Carl S.

Internal-combustion engines

Combustion chamber means having fuel injection only

Having a particular relationship between injection and...

123501, F02D 4500, F02B 302

Patent

active

058787135

ABSTRACT:
A fuel control system for a cylinder injection type engine capable of preventing overlap between periods for the fuel injections for a plurality of engine cylinders while reducing burden imposed on injector drivers and allowing the fuel control system to be implemented on a small circuit scale at low cost by limiting fuel injection timings for driving the injectors. The system includes an air flow sensor (2) for outputting information concerning an intake air flow, a crank angle sensor (5) for outputting information concerning rotation speed of the engine (1) and a crank angle, fuel injectors (11A) for injecting fuel directly into individual engine cylinders, and a control unit (8A) for driving the fuel injectors on the basis of the abovementioned information. The control unit (8A) is so arranged as to arithmetically determine a fuel injection quantity and fuel injection timings for driving the fuel injector (11A) at least in one of suction stroke and compression stroke. The control unit (8A) limits a change of fuel injection timing of the injector in a leading direction so that the change in the fuel injection timing does not exceed a predetermined value, and sets the fuel injection timing at a time point corresponding to a lapse of a predetermined time from the preceding fuel injection.

REFERENCES:
patent: 4926806 (1990-05-01), Ahern
patent: 5339583 (1994-08-01), Matsuura
patent: 5676108 (1997-10-01), Akimoto
patent: 5730105 (1998-03-01), McGinnity
patent: 5735241 (1998-04-01), Matsuura

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