Management Of The Climate Control System - Fiat Bravo Service Manual

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M A N A G E M E N T O F T H E C L I M A T E C O N T R O L S Y S T E M

The injection/ignition control unit is connected to the climate control system, because:

1. it receives the request to switch on the compressor and operate the appropriate interventions (addi-

tional air);

2. it gives the go ahead to switch on the compressor when the conditions required by the strategies have

been verified;

3. it receives information on the state of the four stage pressure switch and operates the appropriate i n -

terventions (operation of the radiator fan).

As far as point 1 is concerned, if the engine is idling, the control unit increases the air f l o w rate, altering

the position of the butterfly in advance of the engagement of the compressor and conversely it returns

the butterfly to its normal position after the compressor is switched off.

The engine idle speed is also increased the entire time the compressor is activated (engine w a r m : 900

As far as point 2 is concerned, the control unit automatically operates the disengagement of the c o m -

- for several seconds (timed disengagement):

- in conditions where the engine power requirements are high (strong acceleration);

- during vehicle take-off;

- as long as the following critical conditions persist:

- temperature of the engine coolant above a certain level (engine overheating);

- engine speed below 700 rpm.