EP0058561A2 — Fuel injection control method

Claim 1

Independent Claim 173 words

A method of controlling fuel injection adapted for a fuel injection control system comprising: a crank angle sensor (4) for generating crank angle pulses at specified crank angles during a plurality of rotations of a crank shaft of an engine (1) having a plurality of cylinders; a timing sensor (3) for sequentially generating M timing pulses between the crank angle pulses; a plurality of injectors respectively mounted to each of the cylinders of the engine; and a controller (2) for computing the fuel injection time for each of the injectors by the interruption by each of the timing pulses and controlling the fuel injection timing for each of the injectors, said controlling method being such that fuel is injected from all the injectors by only the N-th timing pulse before the (N+M-l)-th timing pulse occurs following start-up of the engine, where N is an integer not greater than M, and the fuel is injected from the injectors specified by the crank angle pulses and the timing pulses after the (N+M)-th timing pulse occurs.

Claim 2

Independent Claim 173 words

A method of controlling fuel injection adapted for a fuel injection control system comprising: a crank angle sensor (4) for generating crank angle pulses at specified crank angles during a plurality of rotations of a crank shaft of an engine (1) having a plurality of cylinders; a timing sensor (3) for sequentially generating M timing pulses between the crank angle pulses; a plurality of injectors respectively mounted to each of the cylinders of the engine; and a controller (2) for computing the fuel injection time for each of the injectors by the interruption by each of the timing pulses and controlling the fuel injection timing for each of the injectors, said controlling method being such that fuel is injected from all the injectors by only the N-th timing pulse before the (N+M-l)-th timing pulse occurs following start-up of the engine, where N is an integer not greater than M, and the fuel is injected from the injectors specified by the crank angle pulses and the timing pulses after the (N+M)-th timing pulse occurs.

Claim 3

Dependent Claim 57 words

A fuel injection control method according to Claim 1, wherein when the injector to be specified by the crank angle pulse and the timing pulse is determined before the N-th timing pulse occurs following the engine start-up, the fuel is injected from the injectors normally corresponding to the timing pulses by the N-th and ensuring timing pulses.

Claim 4

Independent Claim 177 words

A method of controlling fuel injection adapted for a fuel injection control system comprising: a crank angle sensor (4) for generating crank angle pulses at specified crank angles during a plurality of rotations of a crank shaft of an engine (1) having a plurality of cylinders; a timing sensor (3) for sequentially generating M timing pulses between the crank angle pulses; a plurality of injectors respectively mounted to each of the cylinders of the engine; and a controller (2) for computing the fuel injection time for each of the injectors by the interruption by each of the timing pulses and controlling the fuel injection timing for each of the injectors, said controlling method being such that it is judged during the interruption processing by the timing pulse following start-up of the engine whether or not the crank angle pulse is present immediately before the timing pulse, and all the injectors are activated simultaneously by any timing pulse occurring at the time when it is determined that the crank angle pulse is absent immediately before the timing pulse.

Claim 5

Independent Claim 177 words

A method of controlling fuel injection adapted for a fuel injection control system comprising: a crank angle sensor (4) for generating crank angle pulses at specified crank angles during a plurality of rotations of a crank shaft of an engine (1) having a plurality of cylinders; a timing sensor (3) for sequentially generating M timing pulses between the crank angle pulses; a plurality of injectors respectively mounted to each of the cylinders of the engine; and a controller (2) for computing the fuel injection time for each of the injectors by the interruption by each of the timing pulses and controlling the fuel injection timing for each of the injectors, said controlling method being such that it is judged during the interruption processing by the timing pulse following start-up of the engine whether or not the crank angle pulse is present immediately before the timing pulse, and all the injectors are activated simultaneously by any timing pulse occurring at the time when it is determined that the crank angle pulse is absent immediately before the timing pulse.

Claim 6

Dependent Claim 85 words

A fuel injection control method according to claim 3 wherein the interruption processing by the timing pulse comprises the steps of: judging whether or not the interruption is effected by the first timing pulse following the engine start-up; judging, when the interruption by the first timing pulse is determined, whether or not the crank angle pulse is present immediately before the first timing pulse; and activating all the injectors when it is determined that the crank angle pulse is absent immediately before the timing pulse.

Claim 7

Dependent Claim 250 words

A fuel injection control method according to Claim 3, wherein the interruption processing by the timing pulse comprises: a first step (401) of computing the fuel injection time; a second step (402) of judging whether or not' a normal flag indicative of a condition ready for the normal injection is set; a third step (403) of judging, when "No" is issued in the second step, whether or not the first interruption is effected; a fourth step (404) of judging, when "Yes" is issued in the third step, whether or not the crank angle pulse is present immediately before the timing pulse; a fifth step (405) of setting the normal flag when "Yes" is issued in the fourth step; a sixth step (406) of activating the first injector; a seventh step (407) of setting contents of a cylinder discriminating RAM to "2"; an eighth step (408) of judging, when "Yes" is issued in the second step, whether or not the crank angle pulse is present immediately before the timing pulse and proceeding to the sixth step (406) when "Yes" is issued in the eighth step (408); a ninth step (409) of activating the injector of the ordinal number identical with the contents of the cylinder discriminating RAM when "No" is issued in the eighth step (408); a tenth step (410) of increasing the contents of the cylinder discriminating RAM by "+1"; and an eleventh step (411) of activating all the injectors simultaneously when "No" is issued in the fourth step (404).

Claim 8

Dependent Claim 154 words

A fuel injection control method according to Claim 5, wherein said interruption processing by the timing pulse further comprises: a twelfth step (412) of judging, when "No" is issued in the third step (403), whether or not the processing is passed through this route three times; a thirteenth step (413) of setting the normal flag when "Yes" is issued in the twelfth step (412); a fourteenth step (414) of judging, after the thirteenth step (413) or when "No" is issued in the twelfth step (412), whether or not the crank angle pulse is present immediately before the timing pulse; a fifteenth step (415) of setting the contents of the cylinder discriminating RAM to "1" when "Yes" is issued in the fourteenth step (414); and a sixteenth step (416) of increasing, after the fifteenth step (415) or when "No" is issued in the fourteenth step (414), the contents of the cylinder discriminating RAM by "+1".

Fuel injection control method

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