School of Engineering (SEN)

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Browsing School of Engineering (SEN) by Subject "Air Conditioner"

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    Automatic intelligent car air conditioner controler
    (University of Management and Technology, 2012) Tabish Sohail Butt; Sarmad Tanveer; Muhammad Saleem
    DURING hot summer periods, your car’s air-conditioner works quite hard to keep cabin temperatures cool. As a result, fuel consumption increases due to the extra load imposed on the engine by the air-conditioning system – or more specifically, by its compressor. But that’s not all – the extra load imposed on the engine by the compressor is readily noticed when travelling up hills, particularly in smaller four cylinder cars. In order to get around this problem, many drivers manually switch off the air-conditioner to ensure extra power during hill climbing or when overtaking. It’s almost like giving the car a mini ‘turbo boost’. On some new cars, this can even happen automatically. These cars have a ‘wide open throttle’ (WOT) cutout relay and this automatically switches off the air conditioner’s compressor during high throttle conditions. If you wanted to maximize engine performance, you would only turn the air-conditioner on when going down hills or when slowing down. That way, the air-conditioner compressor could be used as a brake that converts the energy into cooling the cabin rather than being wasted as heat in the brakes or via engine braking. In practice, of course, it’s quite impractical for the driver to continually switch the air-conditioner on and off. In any case, the compressor would also have to run for at least some of the time on a relatively fl at road in order to keep the cabin temperature at a comfortable level on very hot days