Refrigeration – Automatic control – Refrigeration producer
Patent
1996-05-06
1997-09-23
Tanner, Harry B.
Refrigeration
Automatic control
Refrigeration producer
622284, 62229, 622283, 236 78D, B60H 122
Patent
active
056692269
ABSTRACT:
An air conditioning apparatus for an electric vehicle includes an electrically-driven compressor. A desired temperature is set which relates to one of a temperature of air discharged into a vehicle interior and a temperature within the vehicle interior. Detection is given of a temperature related to a heat exchanger. An inverter connected to the compressor is operative for driving the compressor at a variable speed corresponding to a desired rotational speed. A target temperature related to the heat exchanger is calculated in response to the desired temperature. Calculation is given of a difference between the detected temperature and the target temperature. Also, calculation is given of a variation in the detected temperature for every given period. A corrective rotational speed is calculated from the temperature difference and the temperature variation for every given period. Calculation is given of a sum of a current desired rotational speed of the compressor and the corrective rotational speed for every given period. The calculated sum is set as a new desired rotational speed of the compressor for every given period. The inverter is informed of the new desired rotational speed of the compressor.
REFERENCES:
patent: 4959969 (1990-10-01), Okamoto et al.
patent: 5295363 (1994-03-01), Oomura et al.
patent: 5372015 (1994-12-01), Suzuki et al.
patent: 5410890 (1995-05-01), Arima
Fukumoto Minoru
Kurahashi Yasufumi
Matsushita Electric - Industrial Co., Ltd.
Tanner Harry B.
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