Electricity: motive power systems – Generator-fed motor systems having generator control – With plural – diverse or diversely controlled generators
Reexamination Certificate
1999-07-28
2001-02-20
Ip, Paul (Department: 2837)
Electricity: motive power systems
Generator-fed motor systems having generator control
With plural, diverse or diversely controlled generators
C318S443000, C307S010800, C315S083000
Reexamination Certificate
active
06191544
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a device for compensation of voltage drop at light sources of vehicles having an electrical auxiliary charging device, wherein the auxiliary charging device is comprised of an electric motor and a compressor. The electric motor is supplied with electricity by the vehicle battery, and the light sources and the auxiliary charging device are connected in parallel.
From German patent application 44 99 650 it is known to provide, in addition to the exhaust gas turbo charger, an electrically operated charger which is arranged upstream of the exhaust gas turbo charger and which is activated only in the phase of running up the internal combustion engine in order overcome the so-called turbocharger lag. The electric motor of the charger is supplied with electrical energy by the vehicle battery. Once the exhaust gas turbocharger provides enough charging air, the electric charger can be switched off and bypassed by a switch valve. A disadvantage of such a device is the great voltage drop at the terminals of the vehicle battery when the electric motor is switch on. During operation of such a device, the light output of light sources of the vehicles will show a distinct drop caused by the voltage drop since the light sources are also supplied by the vehicle battery. The light sources in question are, for example, the exterior lights and the passenger compartment lights.
It is therefore an object of the present invention to provide a means for maintaining at a constant level the light output of light sources of a vehicle, especially such light sources which are provided to increase vehicle safety.
SUMMARY OF THE INVENTION
This object is solved in that a resistor is serially connected to the parallel-connected light sources so that the parallel-connected light sources are operated at reduced voltage during regular operation whereby the lamps are designed such that the required light output (illumination) is provided. Upon switching on the electric motor of the auxiliary charging device, the resistor is bridged so that the voltage drop which is caused by the electric motor is compensated and the light sources maintain the desired level of illumination.
In a further embodiment of the invention, a first switch, which is embodied as a solenoid, is closed upon closing the circuit by the on/off switch for actuating the auxiliary charging device. Only when the main switch is actuated, the first switch can be closed by closing the circuit via a second switch.
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Ip Paul
MAN Nutzfahrzeuge AG
Robert W. Becker & Associates
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