Cooling 1
Assignment
The cooling system's task is to regulate the operating temperature of the engine, and all parts of the engine in such a way that the temperature is quickly reached and held as precisely as possible. The temp. should
not be allowed to fall below the operating temp., which should also not be exceeded. Too high an operating temp. endangers the engine directly, too low is detrimental to the exhaust emission values, the fuel
consumption and the lifespan of the engine. Especially beneficial, e.g., for the partial load area is the electronically regulated cooling. In
addition, in closed vehicles,
for safety reasons, the side windows and the windscreen may not steam up, causing visibility to be impeded (interior heating).
Function
Only one third of the warmth originating from the internal combustion engine can be converted into kinetic energy. Roughly another third escapes
through the exhaust. Because
the strain on the materials would be too high, the remaining heat must also be passed on to the environment. There is a distinction between internal and
external cooling. In the
case of the external cooling, the medium to which the engine delivers its heat directly, is decisive, e.g., air cooling, liquid cooling or oil cooling. 08/11
| Tasks of cooling |
| Constant engine operating temperature |
| Early heating of lubrication oil |
| Possibly direct cooling of the lubricating oil |
| Cooling of the recirculated exhaust gas |
| Damping of engine noises |
| Preventing knocking combustion (petrol engine) |
| Heating of the interior |
| No. | Thermostat on the cooler input (top): Sequence | No. | Thermostat on the cooler output (bottom): Sequence |
| 1 | Coolant pump | 1 | Coolant pump |
| 2 | Engine block | 2 | Engine block |
| 3 | Cylinder head | 3 | Cylinder head |
| 4 | Thermostat | 4 | Cooler or short circuit |
| 5 | Cooler or short circuit | 5 | Thermostat |
