Heating/ventilation system management

HEATING/VENTILATION SYSTEM MANAGEMENT

Rpm decreases when the air conditioner is turned on because the system compressor takes up power.

This involves a drop in rpm, which is particularly evident during idling.

To overcome this drawback, when the ECU is informed of air conditioner activation (pin 10) ahead of compressor activation (pin 26), it increases the speed by adjusting the air flow by means of the step motor.

When a power requirement is identified (throttle position higher than a given threshold) the ECU inhibits air conditioner operation for a memorized time interval.

1. Battery
2. Ignition switch
3. Fuse
4. Air conditioning system enablement relay
5. Compressor electromagnetic coupling supply relay
6. Compressor
7. Electronic injection-ignition control unit
8. Three stage pressure switch
9. Defrosting sensor
10. Air conditioner activation switch