Refrigeration – Automatic control – Responsive to vehicle body motion or traction
Patent
1994-11-17
1996-04-16
Tanner, Harry B.
Refrigeration
Automatic control
Responsive to vehicle body motion or traction
62230, 62243, 62134, 188159, 320 61, 236 9A, B60H 100, B60L 722, B60L 1118
Patent
active
055071538
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to an electric motor vehicle which is provided with an electric air conditioner, and particularly to an electric motor vehicle which has an improved utilization efficiency of energy for the overall electric motor vehicle.
BACKGROUND ART
Recently, the electric motor vehicles are attracting attention because they will solve various problems due to the exhaust gas from internal combustion engines which are used for gasoline automobiles. More specifically, carbon dioxide which is contained in the exhaust gas form internal combustion engines accumulates and concentrates in the atmosphere, causing the greenhouse effect and air pollution which are serious problems against the global environment. As a next-generation vehicle which radically solves these problems, electric motor vehicles using a drive motor which does not produce exhaust gas are being put into practical use and various proposals are being made.
But, this drive source for the electric motor vehicles is a motor which has a high efficiency but produces less heat. Therefore, its heat cannot be used for an air conditioning system unlike enormous waste heat which is produced by the operation of conventional internal combustion engines. In view of this, a heat pump method is generally adopted for the air conditioner of the electric motor vehicle. When this air conditioner is operating, a low- or high-temperature refrigerant which is used to heat or cool the cabin is evaporated or condensed by conducting a heat exchange with the open air by means of an exterior heat exchanger and returned to a compressor, thus being circulated within the system in the same way as a room air conditioner.
In the electric motor vehicle, a regenerative brake which uses the drive motor as a generator is generally used in place of the engine brake of a conventional internal combustion engine. In this case, kinetic energy, which must be reduced when the electric motor vehicle decelerates or goes down a slope, is partly converted into electrical energy by temporarily using the drive motor as the generator, and this electrical energy is recovered into a storage battery, thus the drive motor provides a role of an auxiliary brake.
For this type of electric motor vehicle, a lead storage battery is generally used broadly in view of its cost and good resource balance. But, the lead storage battery has disadvantages that its performance is deteriorated and the service life is heavily ruined when the battery, which still has a remaining capacity higher than a prescribed level, is quickly recharged exceeding an appropriate charging current for the battery by high regenerative electric power.
For this reason, in the case of a conventional regenerative brake, the generated regenerative electric power is lowered to protect the lead storage battery, and a common foot brake is used to supplement an insufficient braking force of the electric motor vehicle. Other known methods include a method in that excess regenerative electric power which cannot be recovered into the storage battery is lead to a resistor located outside of the cabin to generate heat so as to release the generated heat into the open air, thereby consuming the excess regenerative electric power, and a method in that a flywheel is rotated by the motor which uses the regenerative electric power, thereby saving as mechanical energy in the flywheel.
A conventional electric motor vehicle, however, uses as an energy source a storage battery whose energy capacity is very small as compared with a fuel such as gasoline and, therefore, has disadvantages that a ratio of energy consumed by the air conditioner to the above capacity is high, and when the air conditioner is operated, a mileage per charge is shortened extremely.
Specifically, when the air conditioner of the electric motor vehicle operates to heat the cabin, since it uses a cabin heat exchanger having a smaller heat exchanging capacity than a room air conditioner, to sufficiently heat the cabin by introducing cold fresh air into the hea
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patent: 5377791 (1995-01-01), Kawashima et al.
Sekino Hirokazu
Seto Takeshi
Seiko Epson Corporation
Tanner Harry B.
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