Automobile-air-conditioner


Posted on Apr 26, 2012

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. Ifthe 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 passinganother vehicle.


Automobile-air-conditioner
Click here to download the full size of the above Circuit.

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 Ql to turn on, discharging C2 and turning off Q3 via diode D2. When Q3 turns off, sn does Q2. When the engine reaches its normal operating vacuum, VS closes and Ql turns off, allowing C2 to charge for 6 seconds until Q3 turns on again.




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    STRESS METER
    Adjustable function generator
    Pulse-delay-with-dual-edge-trigger
    Prology DVD-200 remote control
    Wheelchair Obstacle Avoidance System
    Poddwatt: Class-A Stereo Push-Pull EL84 (6BQ5) Vacuum Tube Amplifier
    DC Instrumentation Amplifier Circuit
    Notes on the Wenzel low power AM transmitter schematic
    400 Hz SERVO AMPLIFIER
    Random Access Memories



    Top