The function of the cooling system is to remove part of the heat absorbed by the engine parts so as to keep the parts of the diesel engine in the normal temperature range. Cooling water should be soft water without dissolved salts, such as clean river water, rainwater and so on. Do not use hard water, spring water or sea water, in case of scale, cause poor heat of the engine, overheating of the cylinder and so on.
From the point of view of design and performance, shunt cooling combined with precision cooling has a good prospect, providing ideal engine protection as well as fuel economy and emission. This structure facilitates the formation of an ideal temperature distribution of the engine. Directly to the cylinder cover around the exhaust valve for supplying cooling liquid, reduce the temperature of the cylinder cover changes, so that the cylinder head temperature distribution is more uniform, and the oil cylinder temperature can also be maintained in the design scope of work, has the friction loss and low pollution emissions. Li
Several advanced cooling systems described above have the potential to improve cooling system performance and improve fuel economy and emissions performance. The cooling system is the key to improve the controllability of the cooling system, the controllability of the key parameters of the said engine protection structure, such as metal temperature, coolant temperature and oil temperature control, to ensure that the engine work in a safe range. The cooling system allows quick response to different conditions, saving fuel and reducing emissions without affecting the overall performance of the engine
As the engine adopts a more compact design and has greater specific power, the waste heat density generated by the engine also increases significantly. Some key areas, such as the cooling around the exhaust valve, need to be given priority. Cooling systems, even with minor failures, can have disastrous consequences in such regions. The cooling capacity of the engine cooling system should generally meet the heat dissipation demand of the engine at full load because the heat generated by the engine is maximum at this time. However, in part load, the cooling system will suffer power loss, and the coolant flow provided by the pump will exceed the required flow rate. We want the engine cold start time as short as possible. Because when the engine idle, emissions of pollutants more, fuel consumption is also large. The structure of the cooling system has a great influence on the cold start time of the engine.
