Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1989-01-25
1990-11-20
Michalsky, Gerald A.
Internal-combustion engines
Charge forming device
Fuel injection system
123198D, 123387, 123506, F02M 6302
Patent
active
049710125
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates a distributor fuel injection radial piston pump for internal combustion engine.
In such distributor fuel injection pumps, such as are described, for example, in the German Patent Application No. P 36 12 942.9, the pump work space is always completely filled with fuel during the suction stroke of the pump piston. The quantity of the injected fuel volume is determined as a function of parameters of the internal combustion engine, such as load and speed, by a point of time at which the electric control valve is closed and opened. When the control valve closes, the fuel is injected into the respective cylinder of the internal combustion engine, whereas the pump work space communicates with the relief space when the control valve opens and the fuel injection is accordingly corruptly terminated. When there is a defect in the control valve such that it remains stuck in its closing position and no longer opens, the internal combustion engine is always supplied with a maximum fuel injection quantity regardless of load, and the speed of the internal combustion engine accumulates in such a way that it cannot be influenced and the internal combustion engine "races".
SUMMARY OF THE INVENTION
The object of the invention is a distributor fuel injection pump, in which delivery of fuel from the pump work space to an injection nozzle is interrupted in the event the control valve becomes stuck in its closing position. The internal combustion engine accordingly stops due to the absence of an ignition mixture. The defect in the control valve is detected by a monitoring device which then transmits a closing command to the second control valve. The increase in speed of the internal combustion engine over a maximum speed, for example, can be a criterion for the defect in the first control valve. The second control valve is preferably constructed in such a way that it is normally closed and opens when controlled. The second control valve closes when the control stops. The closing command consists in an interruption of the exciting current for the electromagnet of the second control valve. In this way, the fuel delivery is also interrupted when the control line of the second control valve experiences disturbance. The second control valve can be much simpler and accordingly cheaper than the first control valve.
DRAWING
The invention as to its construction so as to its method of operation, together with additional objects and advantages thereof, will be best understood from the following description with reference to the accompanying drawing, wherein
FIG. 1a shows a longitudinal cross-sectional view of a first embodiment of a distributor fuel injection radial piston pump according to the present invention in a normal operating position thereof;
FIG. 1b shows a longitudinal cross-sectional view of the pump shown in FIG. 1a but in a position when its normal operation is interfered with;
FIG. 2a shows a longitudinal cross-sectional view of a second embodiment of a distributor fuel injection radial piston pump according to the present invention in a normal operating position thereof;
FIG. 2b shows a longitudinal cross-sectional view of the pump shown in FIG. 2a but in a position when its normal operation is interfered with;
FIG. 3a shows a longitudinal cross-sectional view of a third embodiment of a distributor fuel injection radial piston pump according to the present invention in a normal operating position thereof;
FIG. 3b shows a longitudinal cross-sectional view of the pump shown in the FIG. 3a but in a position when its normal operation is interfered with;
FIG. 4a shows a longitudinal cross-sectional view of a fourth embodiment of a distributor fuel injection radial piston pump according to the present invention in a normal operating position thereof;
FIG. 4b shows a longitudinal cross-sectional view of the pump shown in FIG. 4a but in a position when its normal operation is interfered with.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
A distributor fuel injection radial pisto
REFERENCES:
patent: 3485225 (1969-12-01), Bailey et al.
patent: 4538580 (1985-09-01), Straubel et al.
patent: 4840162 (1989-06-01), Brunel
Brunnel Andre
Leblanc Jean
Morel-Fourrier Jean P.
Michalsky Gerald A.
Robert & Bosch GmbH
Striker Michael J.
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