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Thermodynamics 1
Thermodynamics 2
Thermodynamics 3
Thermodynamics 4
Thermodynamics 5
Thermodynamics 6

Cooling 1

Cooling 2 - Fan Wheel
Cooling 3 - Radiator
Cooling 4 - Maintenance
Cooling 5 - Coolant
Cooling 6 - Repair
Cooling 7 - Fan
Cooling 8 - Vacuum Filling
Cooling 9 - Antifreeze
Cooling 10 - Electronically controlled
Cooling 11 - Thermal Management
Cooling 12 - Summary
Cooling 13 - Heat Pump
How to get engine warm?
Air Cooling
Air-stream Cooling
Air/Liquid Cooling
Blower Cooling
Axial Blower 1
Axial Blower 2
Radial Blower
Liquid Cooling
Cooling Module
Closed Cooling System

Coolant Pump 1
Coolant Pump 2
Coolant Pump 3
Coolant Pump 4

Frost Plug
Hydrostatic Blower
Belt Drive
V-belt Drive
Fuel Vaporization
Thermostat
Electronic Cooling 1
Thermosiphon Cooling
Visc. Cooling Fan 1
Visc. Cooling Fan 2
Oil Cooling
Heat Exchanger
Charge Ait Cooler 1
Charge Ait Cooler 2
Fuel Cooling

Cooling 1
Cooling 2
Cooling 3
Cooling 4
Cooling 5
Cooling 6
Cooling 7
Cooling 8
Cooling 9
Cooling 10
Cooling 11
Cooling 12
Cooling 13



  Thermostat





1To the cooler
2From cylinderhead
3Bypass to pump


Assignment

With a liquid cooled engine, the thermostat allows the engine to reach it's operational temperature as quickly as possible and to maintain it under all operating conditions. This is particularly important for the service life, the fuel consumption and the exhaust gas development of the combustion engine.

Function

With the engine temperature too low after starting or during too low a demand during driving, the thermostat is used as a 2/2 direction-control-valve in the cooling cycle. It allows the coolant flowing out from the engine, (figure 2, on the right) to bypass the radiator through a bypass line, and to flow directly back to the engine. If the pre-set temperature is exceeded, an expansion element inside the thermostat is flooded by the effluent coolant, and basically, shifts the (in green) valve-discs a little upwards (figure 2). Below, in the engine, a mixture of bypass- and cooling liquid is developed. Only then, when the hot liquid arrives at the top, is the thermostat permanently opened. Thus, it prevents the sudden cooling down of one or more cylinders.The third picture shows the complete thermostat housing with the accompanying thermostat. It often appears as a module with temperature sensors and additional connections (e.g, for the heating). Picture 4 shows the thermostat in it's housing.

The opening temperature of thermostats is determined for the respective cooling system. The temperature was previously set at 80°C, nowadays (2009), 90°C and more are achieved. There are also engines with a further cooling circuit inside, directly on the cylinders. This is driven by the same pump, however, it has a second thermostat which opens only above a temperature of 100°C. Thereby, the coolant here is only recirculated when the ideal working status (faster than otherwise) is reached. 05/10




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