| 摘要 |
PURPOSE:To reduce drift in temperature inside a vehicle by controlling evaporator supply temperature in comparison with the information of a thermal load command as which a total of results from multiplying the signals from room temperature, open temperature and temperature setters by respective gains is used. CONSTITUTION:A volume sensor 26 and an open temperature sensor 24 are actuated as feedforard element while a room temperature sensor 23 is actuated as a feedback element. The signals fro those sensor are multiplied by respective gains and the results obtained therefrom are added. The sum is used as one temperature adjusting load command Vms. The signal obtained by multiplying the signal of a supply sensor 25 by a single gain is used as a feedback signal of an evaporator supply air temperature, compared with said temperature adjusting load command Vms, and amplified. Using the amplified signal, a compressor 2 is controlled on/off via a solenoid clutch 12. Thus, evaporator supply air temperature with suitable hysterisis may be determined. The signal of the open air temperature sensor 24 functions as a feedback signal for control, thereby enabling restraint of variation in temperature inside a vehicle. Consequently, the fluctuation width of temperatures of air supplied from the evaporator may be restrained to be constant, hence providing comfortableness. |
