A6 Sedan V6-3.2L (BKH) (2007)
‹› Impulse width - A - is dependent on desired cooling performance, vehicle voltage etc. (over the width of region - A -, voltage is regulated via A/C
Compressor Regulator Valve (N280) by A/C control head Climatronic Control Module (J255)).
‹› The signal distance - B - is always 2 milliseconds (corresponds to frequency of 500 Hertz).
‹› The duty cycle is determined by the ratio of impulse width - A - and signal distance - B -.
-
The impulse width of the square wave signal changes depending on the Climatronic control module (J255) A/C control head setting and the
measured environmental conditions (duty cycle between 100% and greater than 30%, the A/C compressor regulator valve (N280) is activated so
that the compressor output necessary to reach the specified temperatures is achieved).
‹› For operating mode setting "Auto" and temperature setting " Lo" for example, the A/C Compressor Regulator Valve (N280) is activated such that
the maximum permissible current of approximately 0.65 A flows via the A/C Compressor Regulator Valve (N280) (maximum compressor output).
‹› In control mode, actuation time is governed by required cooling output and vehicle electrical system voltage, for example. It is however always of
sufficient duration to achieve a mean current of 0.3 A.