Factory Cheap Hot Volvo Excavator Hydraulic Pump - Water temperature sensor for excavator spare parts – CCMIC

water temperature sensor

Because there are many kinds of spare parts, we can’t display them all on the website. Please feel free to contact us for specific ones.

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1. We supply both original and aftermarket products for you
2. From the manufacturer to the customer directly, saving your cost
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packing

Carton Boxes, or according to clients’ request.

description

Strictly speaking, the water temperature sensor is divided into two categories. No matter which type, its internal structure is a thermistor, and its resistance is between 275 ohms and 6500 ohms. And the lower the temperature the higher the resistance value, the higher the temperature the lower the resistance value.
The function of the first type of water temperature sensor is relatively simple. It is achieved through the change of its internal resistance to change the current through the change of the sensor’s resistance to drive the change of the water temperature meter, and indirectly tell people the operating temperature of the engine. In the second category, the water temperature sensor has no changes in structure, but its function is to provide an analog signal of temperature changes to the engine control unit. Its power supply voltage is a 5V power supply provided by the control unit, and the signal returned to the control unit is a 1.3V-3.8V linear change signal. The main function is to tell the temperature of the engine control unit. In turn, its signal is extremely important for the control unit. The main reason is that the engine has different working methods at different working temperatures.
But these two kinds of water temperature sensors work under different voltage conditions. The sensor for the water supply thermometer is 12V, and the sensor for the engine control unit is 5V, so they are not interchangeable. Moreover, their plug shape itself is different. It is very simple to distinguish between them. The former has only one wire in the plug, while the latter has two wires in the plug for the engine control unit.
The function of the water temperature sensor is to convert the temperature of the cooling water into an electrical signal. After being input to the ECU, there are: 1. Correct the fuel injection volume; increase the fuel injection volume when the temperature is low. 2. Correct the ignition advance angle; increase the ignition advance angle at low temperature, and delay it in order to prevent deflagration at high temperature. 3. Affect the idle speed control valve; ECU controls the action of the idle speed control valve according to the water temperature sensor signal at low temperature to increase the speed.

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