Automotive air conditioner

Refrigeration – Automatic control – Refrigeration producer

Patent

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Details

62227, 62229, 622285, B60H 132

Patent

active

058844970

ABSTRACT:
An automotive air conditioner which is capable of suppressing periodic torque variation in an engine-driven refrigerant compressor while ensuring performance of returning oil thereto to circumvent periodic variation in a rotational speed of an engine, thereby preventing degradation in motor power performance and drivability of an automobile. A value of target blowout temperature is calculated using a set temperature, indoor air temperature, outdoor air temperature and intensity of solar radiation. A value of first target post-evaporation temperature (TEO1) is calculated according to a determined value of target blowout temperature. Then, a value of second target post-evaporation temperature (TEO2) corresponding to a limit level for ensuring oil return performance is calculated according to the outdoor or indoor air temperature. Thereafter, using a value of first target post-evaporation temperature (TEO1) or second target post-evaporation temperature (TEO2), whichever is smaller, as a target post-evaporation temperature (TEO), a discharge capacity of the refrigerant compressor is controlled so that an actual post-evaporation temperature (TE) will meet the target post-evaporation temperature (TEO).

REFERENCES:
patent: 4480443 (1984-11-01), Nishi et al.
patent: 4722196 (1988-02-01), Ishikawa
patent: 4878358 (1989-11-01), Fujii
patent: 5027612 (1991-07-01), Terauchi
patent: 5323619 (1994-06-01), Kim

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