Prime-mover dynamo plants – Electric control – Engine control
Patent
1995-06-05
1997-05-13
Stephan, Steven L.
Prime-mover dynamo plants
Electric control
Engine control
F02D 4500
Patent
active
056295685
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a drive unit for an operating device consisting of an internal combustion engine and a machine driven by it and an electrical consumer, wherein the output to be provided fluctuates with demand. Possible machines for this are, for example, pumps, compressors, generators, drive units etc. in the most varied operating devices.
DESCRIPTION OF THE RELATED ART
Such drive units are controlled in such a way that the internal combustion engine is respectively switched off when the actual value of a quantity to be controlled exceeds a predetermined set value in either direction, and it is started up again when the actual value of the controlled quantity exceeds the set value by a predetermined difference in either direction, i.e. with a hysteresis, after which the internal combustion engine and the drive unit are then operated at full load rpm.
Such a two-point control operation has many disadvantages. The engine is often operated at low temperatures in the start-up phase, which results in a loss of efficiency and an increase in pollutants in the exhaust gas as well as increased wear. Further than that, loud noise is generated since operation is at full load rpm.
A drive unit for a heat pump with an internal combustion engine which drives a compressor and a generator is known from EP-A 0 152 121, wherein a measurement of the output requirements and a corresponding rpm regulation of the internal combustion engine is provided there.
SUMMARY OF THE INVENTION
Based on this state of the art, it is the object of the invention to create a drive unit with a further optimized degree of efficiency which allows a silent, environmentally friendly, economical and material-saving operation.
This object is attained in that the difference between the actual value of the controlled quantity and the actual value, as well as the parameters affecting the controlled quantity, are measured, wherein the respective output requirements are determined from output requirement coefficients assigned to these measured values. In accordance with this, a characteristic output curve for the engine rpm is then determined from characteristic values stored in a control device and is supplied to the internal combustion engine for regulating its rpm.
An electrical generator, which directly and/or via at least one voltage and frequency converting unit supplies electrical consumers, is additionally coupled with the internal combustion engine. Synchronous and asynchronous three-phase current generators are used in this connection. The electrical output is measured and is reported via an appropriate signal to the control unit and is added to the output requirements there. It is furthermore provided that in the rare cases where there is no demand for output or where it is so small that the internal combustion engine provides an unnecessary amount of output even at idle speed, a controlled disconnection of the engine takes place. In the process the electrical installation continues to be operated by the internal combustion engine. As soon as there is a demand for output again, the connection is restored and work is resumed.
The demand determination is converted into engine rpm in that, for example, data from a table of a characteristic output curve in relation to the rpm are stored in the control device, wherein the respective optimum rpm are determined by means of a poll and possibly additionally by means of an interpolation from the table values of the characteristic line.
The set rpm are provided to an rpm control device of the internal combustion engine in the form of a set signal. An rpm signal derived from the engine is supplied to the control device in the form of an actual signal. The difference with the rpm set value is then provided by the control device to an rpm actuator of the internal combustion engine. In a Diesel engine this rpm actuator can be a servo motor for a stroke adjustment of a fuel injection device, for example.
The output requirement coefficients of the parameters which have an
REFERENCES:
patent: 4240145 (1980-12-01), Yano et al.
patent: 4281567 (1981-08-01), Maurer
patent: 4414818 (1983-11-01), Turbard et al.
patent: 4853553 (1989-08-01), Hosie
patent: 4991400 (1991-02-01), Wilkinson
patent: 5140826 (1992-08-01), Hanson et al.
Cuneo Christopher
Icemaster GmbH
Stephan Steven L.
LandOfFree
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