Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1988-03-02
1990-01-16
Argenbright, Tony M.
Internal-combustion engines
Charge forming device
Fuel injection system
F02D 4110, F02D 4134
Patent
active
048936022
DESCRIPTION:
BRIEF SUMMARY
PRIOR ART
The invention relates to a process for fuel metering during acceleration operations, and, more particularly, for metering fuel during acceleration into a plurality of cylinders of an internal combustion engine, with sequential injection.
From German Offenlegungsschrift No. 3,418,387, a process for fuel metering to a plurality of cylinders of an internal-combustion engine, with sequential injection upon acceleration, is described. The quantity of the fuel supplied to the engine is set to a value suitable for the operating state determined, in each case based on the generation of a trigger signal, and the sequential injections of the fuel quantity thus set are effected in a predetermined sequence synchronously with the trigger signal. Upon detection of the acceleration state, an additional fuel injection is carried out during a trigger signal. If a fuel increase is established at the time of the generation of an instantaneous trigger signal, the additional injection of the set fuel increase is performed into the cylinder into which one of the sequential injections was performed during the previous trigger signal. The fuel increase of the acceleration is preferably set to the value which corresponds to the difference between a fuel injection quantity set at the time of the generation of the instantaneous trigger signal and a fuel injection quantity supplied during a previous trigger signal. The fuel injections take place synchronously with and always at the same times as the generation of the pulse of a trigger signal. An adaptation to the operating state does not take place.
SUMMARY OF THE INVENTION
The process according to the invention for fuel metering during acceleration operations has in comparison the advantage that a direct and fast metering of the fuel quantity corresponding to the acceleration state takes place. With the detection of the acceleration state and the new calculation or new establishment of the fuel quantity, the difference in quantity from the fuel quantity determined in the previous operating cycle is determined. This extra quantity is supplied to the cylinders whose regular fuel injection has been commenced but whose intake stroke has not yet been concluded. This takes place on the one hand in the form of additional fuel injections at cylinders whose fuel metering has been concluded or else by prolongation of fuel injection in progress by the extra quantity calculated. Furthermore, the injection valves for all fuel injections whose commencement has been brought back in time by the newly calculated fuel quantity are immediately opened. During the acceleration operation, particular importance is thus attributed to a fast metering of the increased fuel quantity; according to the invention, this takes place with priority over the ending of a fuel injection preset by the angle of advance. The sequential injections of the set quantity of fuel take place in a predetermined sequence at a time dependent on the operating state of the internal-combustion engine, within the operating cycle preset by the trigger signal. Additional fuel injections are performed, to be precise into all those cylinders whose injected fuel quantity still has not been taken in and whose inlet valve has not yet been closed. The fuel injections already in progress at the moment that additional fuel injections are performed are increased by the necessary extra quantity. Furthermore, the fuel injections whose commencement was still in the future before detection of the acceleration state are expediently commenced earlier than stationary or else immediately in order to ensure the ending of the injection operation still before the closing of the inlet valve.
DRAWING
The process according to the invention is illustrated in the drawing and is explained in more detail in the following description. The drawing shows a time history of the fuel metering after detection of an acceleration state .
DESCRIPTION OF THE INVENTION
The drawing is based on an internal-combustion engine with four cylinders, the trigger
REFERENCES:
patent: 4463732 (1984-08-01), Isobe et al.
patent: 4508085 (1985-04-01), Yamato
patent: 4620519 (1986-11-01), Nagao et al.
patent: 4697568 (1987-10-01), Yasuoka
patent: 4723524 (1988-02-01), Atago et al.
Gross Helmut
Hoptner Wolfgang
Kaiser Gunther
Argenbright Tony M.
Robert & Bosch GmbH
Striker Michael J.
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