| 摘要 |
An electronic system to keep the set air temperature inside a motor vehicle constant. It comprises an electronic thermostat, a radio transmitter to transmit the on/off signals of said thermostat, a radio receiver to capture said on/off signals which will drive a switching circuit 10 to turn on/off the vehicle air-conditioner, and a time delay network 9 to delay the on/off actions of said switching circuit. Said electronic thermostat comprises a temperature sensing circuit 1, a temperature setting circuit 2, a humidity sensing circuit 3 to compensate the set temperature, a comparator 4 to compare the two output voltages from said temperature sensing circuit and said temperature setting circuit, and a switching circuit 5 to turn on/off the transmitter. The thermostat and the transmitter are packed together and installed on the motor vehicle dashboard. The receiver and the time delayed switching circuit are packed together and installed under the hood of said motor vehicle. The system requires no skill and no tools for installation, can extend the air-conditioner life and save the fuel consumption up to 90% over the other existing automatic or manual temperature control systems for motor vehicle air-conditioning.
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