Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1987-08-04
1989-04-04
Argenbright, Tony M.
Internal-combustion engines
Charge forming device
Fuel injection system
123414, 123478, F02D 4134, F02D 4136
Patent
active
048175749
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a feed system for injection nozzles. In order to control the commencement of injection and the amount of fuel injected, which can also be determined by the injection duration, feed systems are known for internal combustion engines, which feed systems use speed transmitters, which are connected with the crankshaft and the camshaft, in order to determine the engine speed. The respective engine speed is fed to a computer which determines the commencement of the injection process and the injection quantity in connection with other parameters for the different cylinders. In order that the engine can be operated in an optimal manner at different speeds and under different operating conditions, it is necessary to determine the commencement of injection and the injection quantity as accurately as possible as a function of data relating specifically to the engine and of the respective operating conditions. Special synchronizing transmitters are required for this purpose in known arrangements which ensure that the different cylinders are injected with fuel in the correct sequence and at the correct time. A relatively great expenditure is required in this case because of the additionally required transmitters.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a feed system which has the advantage that a single pulse transmitter can suffice for determining the speed and for synchronization, which pulse transmitter sends a pulse train with pulse intervals which vary at least partly in magnitude. For example, an inductive transmitter in conjunction with a toothed gear, which is arranged on the crankshaft or camshaft, can be used as a pulse transmitter. The toothed gear can comprise an additional tooth or tooth gap as a synchronizing mark which procudes a pulse interval diverging from the rest of the pulses at the corresponding place in the pulse train. This asymmetry and, accordingly, the synchronizing mark can be detected with a suitable evaluating circuit and can be fed to the engine control together with speed pulses. In order to determine the commencement of injection and the injection quantity, which can be determined by the injection duration, as accurately as possible the instantaneous speed is determined within as short a time as possible before the commencement of injection. Accordingly, speed fluctuations, which are brought about by changes in load or other influences, can only cause a deviation from the calculated speed and the actual speed at the moment of the commencement of injection to a very limited extent.
In the feed system, according to the invention, a pulse transmitter can also be arranged on the camshaft and/or the crankshaft for providing reference pulses and speed pulses. In order to determine the commencement of injection, it can be advisable to arrange a corresponding pulse transmitter on the crankshaft, while a suitable pulse transmitter can be connected with the camshaft in order to determine the instantaneous speed. However, depending on the use, a single pulse transmitter can also be sufficient for determining the instantaneous speed and the commencement for injection. A pulse transmitter coupled with the crankshaft can generate reference pulses in accordance with which the fuel injection commences at a delay time which is a function of the speed and the characteristic field. The delay time is calculated by the engine control.
The pulse train, which is generated by a pulse transmitter in connection with a toothed gear, contains a synchronizing oscillation, which is generated by means of the synchronizing mark--tooth gap or additional tooth--and a speed oscillation produced by the rest of the teeth. The period of the synchronizing oscillation produced by means of the synchronizing mark is preferably twice that of the speed oscillation. Accordingly, a continuous transition from the synchronizing oscillation to the speed oscillation is achieved. It is advantageous to select the number of teeth without a synchro
REFERENCES:
patent: 4407155 (1983-10-01), Sundeen
patent: 4434770 (1984-03-01), Nishimura et al.
patent: 4442822 (1984-04-01), Kondo et al.
patent: 4471653 (1984-09-01), Kawamura et al.
Engel Gerhard
Kutner Thomas
Stunkel Rolf
Wessel Rolf
Argenbright Tony M.
Robert & Bosch GmbH
Striker Michael J.
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