Motor vehicles – Power – Electric
Patent
1995-03-21
1997-05-27
Camby, Richard M.
Motor vehicles
Power
Electric
180 654, 290 17, B60K 100, B60K 508
Patent
active
056323522
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a motor vehicle comprising: electrical power; setting signal representative of a desired power; from a second electrical power, said motor means including an electric motor mechanically coupled is said driving wheel and a circuit for controlling said electric motor that is responsive to said power setting signal to regulate the value of said second mechanical power to the value of said desired power.
BACKGROUND OF THE INVENTION
Motor vehicles having the above features, such as those described for instance in patents U.S. Pat. No. 4,306,156 and DE-C-2,943,554, further comprise a battery of accumulators that supplies most of the time the energy consumed by their electric motor. The fuel engine of these known vehicles is only put into operation when the amount of energy available in the battery drops below a predetermined value. The fuel engine then supplies via the generator coupled thereto the energy consumed by the electric motor and that required to recharge the battery. When the amount of energy available in the battery reaches another predetermined value, greater than the preceding predetermined value, the fuel engine is stopped. The energy consumed by the electric motor is then again supplied solely by the battery. U.S. Pat. No. DE-C-2,943,554 further provides for the electric motor to be operated as a generator to brake the vehicle, the electrical energy thus produced being fed to the battery inasfar as the latter is not already fully charged.
A vehicle such as those that have just been described suffer from many drawbacks caused by the battery of accumulators with which it is provided.
Thus, for example, such a battery has a large mass, generally greater than 100 kilograms and sometimes even several hundreds of kilograms, thereby increasing the unladen mass of the vehicle provided with this battery and hence reducing the overall efficiency of the latter, i.e. the distance it can travel, all else being equal, with a given amount of energy.
Besides, such a battery has a very large volume, thereby reducing the ratio between the useful internal volume of the vehicle in which it is installed and the total volume of the latter.
Further, the cost of such a battery is high, therefor increasing the cost price of the vehicle, and its life is limited, thereby having to replace it periodically and hence increasing the maintenance costs of the vehicle.
Moreover, the large mass and large volume of such a battery give rise to serious problems as regards its installation in the vehicle, these problems being further complicated by the fact that this battery needs to be readily accessible for maintenance and/or replacement purposes, problems that can only be resolved by resorting to rather complex means whose cost still further increases the cost price of the vehicle.
It should be added that such batteries are a serious hazard for the environment in the event of an accident to the vehicle because of the large amount of polluting materials, such as lead, sulphuric acid or potassium hydroxide, they contain.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a vehicle of the same kind as the above-described known vehicles, but which does not suffer from their drawbacks, i.e. a vehicle which, all other things being equal, has a lesser mass than that of known vehicles and hence a higher overall efficiency than the latter, a cost price and maintenance costs that are also less than those of known vehicles, the vehicle according to the present invention further having a better useful volume to total volume ratio than those known vehicles and being much lesser an environmental hazard than these known vehicles in case of an accident.
This object is achieved by the claimed motor vehicle which comprises: electrical power; setting signal representative of a desired power; from a second electrical power, said motor means including an electric motor mechanically coupled to said driving wheel and a circuit for controlling said electric motor that is
REFERENCES:
patent: 4306156 (1981-12-01), Monaco et al.
patent: 4533011 (1985-08-01), Heidemeyer et al.
patent: 5214358 (1993-05-01), Marshall
Edye Thomas
Jeanneret Rene
Muller Jacques
Camby Richard M.
SMH Management Services AG
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