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A/C compressor control

A/C compressor control



A/C compressor activation is controlled by functions in both DICE and PSG 16. The following description covers that which applies to functions in PSG 16.

The A/C compressor control function comprises two sub-functions


- logic function

- control function


Logic function

The logic function is used to determine when the A/C compressor is to be switched off. This makes it possible to deactivate the A/C compressor during certain driving conditions when maximum engine torque is required.

The A/C compressor is switched off in the following driving conditions


- Coolant temperature is higher than 123°C (253°F)

- Accelerator sensor value is greater than 95%, engine speed < 2500 rpm, and driving in first gear

- Engine speed is < 600 rpm


Control function

The control function governs activation and deactivation of the A/C relay based on the command of the logic function.

When amplifier control has an amplified signal, pin K30 is grounded and the A/C relay supplies power to the A/C compressor's electromagnetic clutch.