| 摘要 |
<p>PURPOSE:To automatically optimize the cooling capacity of an air conditioner for a vehicle, in which a compressor is controlled to equalize the temperature of an evaporator to a set level, and to economize energy, by detecting the temperature of air flowing into the evaporator and by changing the set level depending on the detected temperature. CONSTITUTION:When the temperature of air at the inlet port of an evaporator has dropped due to the fall in the external air temperature or in the load of cooling, the resistance of a thermistor Ra increases so that a voltage VA drops. When the voltage VA has become lower than another voltage VB, the output of a differential amplifier OP gets zero and a compressor 12 stops. As a result, the temperature of the evaporator rises, the resistance of a thermistor Re decreases and the voltage VB falls. When the temperature of the evaporator rises so that the voltage VB becomes lower than the voltage VB, the differential amplifier OP operates to drive the compressor 12. If the temperature of the evaporator drops, the compressor 12 stops again. According to this constitution, a set temperature for driving the compressor 12 is made higher as a result of the fall in the temperature of incoming air to the evaporator to reduce the cooling capacity. In other words, the cooling cpapcity is automatically reduced when the load of cooling has decreased.</p> |
