Motor vehicles – Power – Electric
Patent
1995-07-13
1998-12-15
Culbreth, Eric D.
Motor vehicles
Power
Electric
180 652, 180 653, 180 658, 180 693, B60K 100
Patent
active
058486593
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention is directed to a non-railbound vehicle having at least one driving wheel coupled with an electric motor which is supplied with electric current via output electronics which are influenced by an electronic control. The current is generated by a generator that is coupled to an internal combustion engine and functions at an operating voltage in the medium-voltage range. A low-voltage power supply is also present for supplying power to the accessory electrical consumers of the vehicle, and includes a battery which is supplied with current obtained by transforming a portion of the mechanical energy generated by the internal combustion engine.
DESCRIPTION OF THE PRIOR ART
WO-A-9115378 discloses such an electrically driven vehicle as is described above. In this vehicle a portion of the output generated by the generator is supplied to the low-voltage power supply either by a separate winding in the generator or from a DC-voltage intermediate circuit via an inverter. A central control unit coordinates the distribution of power to the driving motors, wherein antilock system and antiskid system functions can be realized. However, the central control unit does not influence the supply of power to the low-voltage vehicle power.
U.S. Pat. No. 5,166,584 discloses an electric vehicle in which the power requirement for high energy consumers is reduced when maximum output is required for powering the driving motors of the vehicle.
WO-A-9115378 discloses an electric vehicle with the features contained in the preamble of claim 1, in which a portion of the output generated by the generator is supplied to the low-voltage power supply either by means of a separate winding in the generator or from the DC-voltage intermediate circuit via an inverter. A central control unit coordinates the distribution of power to the driving motors, wherein antilock system and antiskid system functions can be realized. However, the central control unit does not influence the supply of power to the low-voltage vehicle power supply.
U.S. Pat. No. 5,166,584 discloses an electric vehicle in which the power requirement for high-energy consumers is reduced when maximum output is required for the driving motors.
A drive system for non-railbound vehicles which are outfitted with an internal combustion engine whose output shaft is coupled with an electric generator is known from the publication "Vehicle transmissions--present 1991, pages 611-622). The driving wheels of the vehicle are connected with electric driving motors which draw their driving power from the generator. Because of the comparatively high output required to drive the vehicle, the generator operates in the medium-voltage range (e.g., 650 volts). A low-voltage power supply (e.g., 12 or 24 volts) in the form of a suitable vehicle power supply with a vehicle battery is provided as is customary (also for safety reasons) for the secondary or accessory electrical consumers found in the vehicle such as interior and exterior illumination, ventilator motors, windshield defroster, passenger compartment heating system, electric window openers, etc. In addition, a vehicle of this type can also be outfitted with a storage for storing driving power, e.g., a short-term storage in the form of a flywheel storage coupled with an electric generator or a long-term storage in the form of an accumulator.
In conventional vehicles, the power supply for accessory electrical consumers is generally provided for by a small electric generator, also known as a dynamo, which is driven by the internal combustion engine. The dynamo also supplies the current required for charging the vehicle battery which is then available for supplying current to the accessory electrical consumers when the dynamo supplies insufficient current (low speed, many consumers turned on) or none at all (internal combustion engine not in operation).
It has already been mentioned in the publication VDI-Bericht 878 that the generator producing the current for the electric driving motors can take over the
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Karg Erich
Lutz Dieter
Culbreth Eric D.
Mannesmann Aktiengesellschaft
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