Electricity: single generator systems – Combined control of generating means and load circuit
Patent
1991-04-01
1992-11-03
Hickey, R. J.
Electricity: single generator systems
Combined control of generating means and load circuit
322 33, 322DIG1, 318140, H02H 706, B60R 1602, H02K 904, H02K 924
Patent
active
051608812
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention is directed to an alternator with an added ventilator, particularly a three-phase alternator for motor vehicles in which the air flow of the added ventilator serves to cool the alternator, and wherein the added ventilator is supplied with voltage by the alternator.
In internal combustion engines which are operated over a very great speed range and in which high demands are made on alternator outputs, it must be ensured for reasons relating to temperature that the alternator is cooled with fresh air by means of an additional ventilator. This fresh air can be supplied e.g. via a hose line from an area located outside the engine space.
Alternators with external ventilation, in which the alternator is additionally cooled by means of a fan, are already known in principle. Thus, for example, an externally ventilated three-phase alternator is known from DE-OS 32 31 152 in which the fan is driven by means of a three-phase asynchronous motor whose squirrel-cage rotor is securely coupled with the fan. In so doing, the stationary windings of the asynchronous motor are connected, via a switch, to the a.c. windings of the alternator for the power supply. However, a monitoring of the functioning of the asynchronous motor, and accordingly of the fan, is not provided; the alternator can accordingly be destroyed by thermal overloading in the event that the fan does not start as desired.
SUMMARY OF THE INVENTION
According to the invention, the alternator with the ventilator is provided with a device for monitoring and/or controlling the ventilator. Advantageously this device can be structured to check its own operability.
The alternator with the ventilator, according to the invention, has the advantage over the known alternator that the functioning of the ventilator is constantly monitored and that the device for monitoring the functioning of the ventilator monitors itself by means of a self-diagnosis. Defects in the operativeness of the ventilator and of the device for monitoring the ventilator are displayed.
Further, defects in the wiring or a separation or breakage of a line are also displayed.
In another construction of the invention, the device for monitoring the operativeness of the ventilator is further developed in such a way that the control of the ventilator can be effected by means of this device. In so doing, the additional ventilator can be switched on or off e.g. as a function of the temperature of the rectifier in the alternator.
BRIEF DESCRIPTION OF THE DRAWING
Embodiment examples of the invention are shown in the drawing and explained in more detail in the following description.
FIG. 1 shows a first embodiment example of the invention;
FIG. 2 shows the respective wiring diagram of the device for monitoring the ventilator;
FIG. 3 shows a second embodiment example;
FIG. 4 indicates a wiring diagram of the device for controlling and monitoring the ventilator. Identical structural component parts are provided with the same reference numbers where advisable.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
FIG. 1 shows a motor vehicle power supply with an alternator 10 which comprises terminals D-, DF, D+ and B+. The alternator 10 is connected with a voltage regulator 11 via the terminals D-, DF and D+. Terminal D- of the alternator 10 and voltage regulator 11 is connected to ground.
Another terminal K1.30 is connected to the terminal B+; the battery 12 lies between terminal K1.30 and ground, as do the consumers 13 which can be connected to terminal K1.30 or separated from terminal K1.30 via switch 14.
A device 15 for monitoring the ventilator, which contains twelve connection possibilities (pins), is connected via pin 6 with the alternator terminal D+, via pin 7 with terminal K1.30, and via pin 11 with the ventilator 18 which is provided for the alternator ventilation; the added ventilator 18 is also connected to ground.
Pin 9 of the device 15 for monitoring the ventilator is connected via a display light 16a with a terminal K1.15 which is connected in turn w
REFERENCES:
patent: 4162419 (1979-07-01), De Angelis
patent: 4450389 (1984-05-01), Frister
patent: 4564775 (1986-01-01), Mazzorana
Kohl Walter
Meyer Friedhelm
Schramm Guenter
Hickey R. J.
Robert & Bosch GmbH
Striker Michael J.
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