Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1985-05-08
1987-03-31
Dolinar, Andrew M.
Internal-combustion engines
Charge forming device
Fuel injection system
123475, 123491, F02D 4300
Patent
active
046534504
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to an arrangement for metering fuel to a spark-ignition internal combustion engine equipped with a fuel injection system.
BACKGROUND OF THE INVENTION
Such arrangements include as an essential component a control apparatus having its functions either hardwired or freely programmable using, for example, a microcomputer. Control apparatus of this type have been already described in detail in pertinent technical literature and belong to the state-of-the-art for a long time. These control apparatus are well proven in practice with respect to road behavior and exhaust emission of the internal combustion engine.
On the other hand, the relatively complicated configuration of these control apparatus can lead to possible failure of individual components. A malfunction in a secondary component may tie up the function of the entire control apparatus and thus also the internal combustion engine. To circumvent this disadvantage, many suggestions have already been made as, for example, in patent application WO No. 80/00597. In this patent application, it is suggested that the control apparatus be provided with at least one sensor-controlled auxiliary device the output signals of which, alternatively to the output signals of the control apparatus, are adapted to be applied via a switch-over device to final control stages, for example, to the final control stages of an electric injection system. In this arrangement, the auxiliary devices are controlled by the output signals of the same sensor which is also connected to the control apparatus.
SUMMARY OF THE INVENTION
In contrast to the solutions suggested above, the arrangement of the invention affords the advantage of permitting an emergency mode of operation in the event of a failure of the control apparatus without requiring the use of such relatively complex auxiliary devices. In lieu of the output signals of such auxiliary devices, the signals of the ignition system are utilized for the control of the fuel injection valves. This permits the implementation of an extremely cost-effective emergency operation concept enabling the operator of a motor vehicle equipped in this manner to reach the nearest service station under a kind of emergency operating condition also in the event of a failure of the control apparatus.
Another advantage is that the ignition signals are derived from a generator which does not act upon the control apparatus. Consequently, this system will also prove effective when a generator providing the main input quantities of the control apparatus fails.
Particularly the simple coupling of the ignition system with the injection system via a diode and a simple selector switch is especially simple and cost effective. This feature is particularly advantageous in cases where such an arrangement is to be retrofitted to already existing control apparatus.
BRIEF DESCRIPTION OF THE DRAWING
The invention will now be described with reference to the drawing wherein:
FIG. 1 is a schematic of an arrangement according to the invention for metering fuel to an internal combustion engine;
FIG. 2 is a schematic of an alternate embodiment of the arrangement according to the invention; and,
FIG. 3 is a schematic of still another embodiment of the invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS OF THE INVENTION
In FIG. 1, reference numeral 10 identifies an ignition coil which includes a primary winding 11, a secondary winding 12 and an iron core 13. Primary winding 11 is inserted between the battery voltage U.sub.B and the collector of a transistor 14 which has its emitter connected to ground potential. Applied to the base of transistor 14 is the output of an ignition pulse generator 15 which may be configured as a mechanical interrupter, induction generator, Hall generator, Wiegand generator or also an an optical generator, for example. The input of secondary winding 12 of ignition coil 10 is connected to circuit node 16 between the primary winding 11 and the collector of transistor 14. On its output side, the hi
REFERENCES:
patent: 3834361 (1974-09-01), Keely
patent: 4370962 (1983-02-01), Hosaka
patent: 4517952 (1985-05-01), Hosoya
Arnold Herbert
Jundt Werner
Malicki Siegfried
Werner Peter
Dolinar Andrew M.
Ottesen Walter
Robert & Bosch GmbH
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