Relay of the cooling system VAZ-2103 ... 2108. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Automobile. Electronic devices
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The TM108 thermobimetallic sensor, used as a relay for turning on an electric fan in an engine cooling system, very often fails. In hot weather, in conditions of heavy urban traffic, the electric fan works almost continuously. As a result, the contacts of the fan switch-on sensor burn out, and it is impossible to restore them.
After repeated replacements of this sensor, I made an electronic relay, where a "regular" TM106 thermistive temperature sensor is used as a sensor, with which the engine temperature is controlled.
The circuit of this temperature switch has been working flawlessly for many years. The main node in it is the Schmitt trigger, assembled on transistors VT1, VT2. The trigger input is connected to the R1 ТМ106 thermoresistive sensor. Resistor R2 sets the relay operation threshold at a liquid temperature of 92...94°C. From the collector of the transistor VT2, the control signal is fed to the electronic key on the transistor VT3, which in turn turns on the executive relay K1 of the electric fan M1 for engine cooling. The zener diode VD1 prevents false alarms of the relay during fluctuations in the on-board supply voltage of 12 V.
The circuit board is installed in the case of any old PC-527 type relay, and the VT3 transistor is installed under the screw on this case for better cooling.
Author: P. Belyatsky, Novosibirsk region, Berdsk; Publication: N. Bolshakov, rf.atnn.ru
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