Internal-combustion engines – Accessories – Covers – trays – vibrators – corrosion inhibitors – air filters
Patent
1981-08-05
1983-06-21
Lazarus, Ira S.
Internal-combustion engines
Accessories
Covers, trays, vibrators, corrosion inhibitors, air filters
123631, 123198D, F02B 7700
Patent
active
043889000
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a device for automatically stopping a diesel engine and, more particularly, to an automatic stopping device for automatically stopping a diesel engine upon detect of reversing of the latter.
BACKGROUND ART
In diesel engines for automobiles, it is essential that the engine be stopped without delay in the event that the engine is accidentally reversed. When the diesel engine is reversed, an oil pump directly connected to the engine is also reversed so that the delivery pressure of the pump is lowered. It is possible to detect the reversing of the diesel engine through the detection of lowering of the delivery pressure of the pump, and by operating an actuator for stopping the engine in response to the detection of the lowering of the oil pressure by means of a pressure switch, the engine can be stopped without delay after the reversing. An example of such stopping device is shown in Japanese Patent Laid-open No. 1522/1973.
Another known automatic stopping device incorporates a vacuum pump connected to the diesel engine, adapted to produce a vacuum output by which braking mechanism is actuated. When the engine operates in the correct direction, a vacuum greater than a predetermined level is produced at the suction side of the vacuum pump. However, as the diesel engine is reversed, a positive pressure is produced at the suction side of the vacuum pump. It is, therefore, possible to automatically stop the diesel engine when the latter happens to be reversed, by using, in combination, a pressure responsive means associated with the suction side of the vacuum pump and an actuator for stopping the diesel engine when a predetermined positive pressure is reached at the suction side of the vacuum pump. This type of automatic stopping device is shown in Japanese Utility Model Publication No. 53-24600.
These conventional automatic stopping device can stop the diesel engine automatically and without fail when the diesel engine is accidentally reversed, but involve a problem of impractically large time lag of operation. More specifically, the first-mentioned type device requires 2 to 4 seconds before the oil pressure switch operates after the commencement of the reversing, and the second-mentioned type of the stopping device requires also 2 to 4 seconds until the predetermined level of the positive pressure is reached at the suction side of the vacuum pump after commencement of reversing of the latter.
DISCLOSURE OF INVENTION
Accordingly, an object of the invention is to provide a device capable of automatically stopping the diesel engine without delay after commencement of the reversing of the diesel engine.
Another object of the invention is to provide a fail-safe and reliable automatic stopping device for diesel engines.
To these ends, according to the invention, the reversing of the diesel engine is detected by detecting, while using the voltage of one phase of a multi-phase alternator connected to the engine as a reference, the phase relation between the reference voltage and other phase voltages.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a circuit diagram of an embodiment of the invention; and
FIG. 2 is a waveform chart of signals obtained at every points of the circuit shown in FIG. 1.
BEST MODE FOR CARRYING OUT THE INVENTION
Referring to FIG. 1, a 3-phase alternator 10 has a stator 17 provided with coils 12,14,16 of three phases and a rotor 21 connected to the output shaft 20 of a diesel engine 18. As the rotor 21 rotates, three-phase A.C. current is produced in the phase rotation as indicated by arrow. The following explanation will be made on an assumption that the rotational direction shown by this arrow is the forward direction. A rectifier 22 has 6 (six) diodes 23,24,25, 26,28,30 connected in the form of a 3-phase bridge. The cathodes of the diodes 23,24,25 are commonly connected to a positive output terminal 32, while the anodes of the diodes 26,28,30 are connected commonly to a negative output terminal 34 and are grounded. The anodes of the di
REFERENCES:
patent: 3763397 (1973-10-01), Yockens
patent: 3993038 (1976-11-01), Alt et al.
patent: 4054117 (1977-10-01), Palmen et al.
patent: 4080940 (1978-03-01), Fuzzell et al.
patent: 4086894 (1978-05-01), Capurka et al.
Hitachi , Ltd.
Lazarus Ira S.
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