Electricity: single generator systems – Combined control of generating means and load circuit
Patent
1990-06-05
1991-12-31
Hickey, R. J.
Electricity: single generator systems
Combined control of generating means and load circuit
322 15, 322 23, 322 28, H02J 714
Patent
active
050775162
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a generation unit for a motor vehicle engine including a generator driveable by an internal combustion engine, an on-board power supply system, evaluating circuit to which at least one of engine speed, generator voltage, battery voltage, battery current, battery temperature, and consumer voltage is input.
The voltage supplied by the generator to the on-board power supply system must be regulated and adapted to the respective requirements. Generator units with devices for regulating the generator voltage to be fed into an on-board power supply system are already known. For example, a device for regulating a charging system for a motor vehicle in which the operating parameters as well as the charging system parameters are determined and evaluated at fixed time intervals is described in the DE-OS 33 13 398. The operating parameters of the internal combustion engine are particularly the speed and the air/fuel ratio, the charging system parameters are generator current, generator voltage, battery current and battery voltage.
However, this device for regulating the charging system does not yet comprise all essential parameters; further, the generator speed cannot be influenced independently of the speed of the internal combustion engine as would be desirable for an optimal regulating of the on-board power supply system voltage.
SUMMARY OF THE INVENTION
The object of the invention is a generator unit in which an evaluating circuit determines the parameters of the internal combustion engine and the on-board power supply system which are essential for the voltage regulation, evaluates them while taking into account internally stored characteristic field data, and enables an optimally operable and comprehensive regulation of the generator unit.
An optimal adaptation of the generator to the voltage requirements of the on-board power supply system with respect to speed is effected by an intermediate drive which is connected between the internal combustion engine and the generator which is drivable by the internal combustion engine.
A more simple voltage regulation is made possible by dividing the on-board power supply system into an area with consumers which are not sensitive to voltage, an area with consumers which are sensitive to voltage, and an area with consumer voltage with exact tolerances, preferably for sensitive electronic equipment.
Depending on the priority which is set in each instance, either the noise of the generator unit can be minimized by the aforementioned steps that insure that the generator is continuously operated in a suitable speed range, or is mechanically converted into electrical energy with the lowest possible fuel consumption by reducing the speed of the generator via the intermediate drive during intensive loading of the internal combustion engine and favorable power supply of the battery and consumers without the generator being entirely uncoupled from the internal combustion engine. At full load and simultaneous good voltage supply, the generator can also be completely uncoupled from the internal combustion engine so that the full capacity of the internal combustion engine is available for the drive of the vehicle.
The present invention both as to its construction so to its mode of operation, together with additional objects and advantages thereof, will be best understood from the following detailed description of the preferred embodiment with reference to the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
The single FIGURE of the drawings shows a schematic view of the generator unit according to the invention.
DESCRIPTION OF THE PREFERRED EMBODIMENT
The generator unit, according to the invention and shown in the FIGURE comprises a generator 12, which is drivable by an internal combustion engine 10 via an intermediate drive 11 which can be regulated electronically, an evaluating circuit 13, and an on-board power supply system 14, 15, 16, 17, 18, 19. The on-board power supply system is divided in three parts and comprises an area with low dema
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patent: 4044293 (1977-08-01), Follmer
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patent: 4322630 (1982-03-01), Mezera et al.
patent: 4542462 (1985-09-01), Morishita et al.
patent: 4670704 (1987-06-01), Maehara et al.
patent: 5021727 (1991-06-01), Mashino
Hickey R. J.
Robert & Bosch GmbH
Striker Michael J.
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