AUTOMOBILE_AIR_CONDITIONER_SMART_CLUTCH

Published:2009/7/6 3:12:00 Author:May | From:SeekIC

This circuit disables the air conditioner compressor when additional engine power is required. It does so by monitoring the engine vacuum at the intake manifold. If the vacuum drops to 40% of its normal level, the compressor clutch is disabled, removing the air conditioner load from the engine. After the engine returns to normal vacuum level, there is a 6 second delay before the compressor clutch is enabled and the air conditioner is reactivated. This allows 6 seconds of extra power, about 500 ft at 60 MPH, which increases the safety margin when passing another vehicle. Loss of cooling is minimal because the air conditioner fan is not interrupted. When the engine is accelerated, manifold vacuum drops and vacuum switch VS opens to 40% of the normal manifold pressure. This causes Q1 to turn on, discharging C2 and tuming off Q3 via diode D2. When Q3 tums off, so does Q2. When the engine reaches its normal operating vacuum, VS closes and Q1 turns off, allowing C2 to charge for 6 seconds until Q3 turns on again.



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