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Low temperature start
The minimum starting speed at which the engine can be started at a certain temperature is usually used to indicate the starting performance at that temperature, and the low temperature starting performance is indicated by the lowest temperature at which the engine can be started. Starting performance is primarily related to engine type, combustion chamber design, and process level. During use, the low-temperature startability of the engine is mainly affected by the viscosity of the engine oil, the evaporability of gasoline or diesel, the low-temperature fluidity of the diesel oil, and the working capacity of the battery.
The crankshaft resistance torque and starting speed of the engine are mainly affected by the viscosity of the lubricating oil under low temperature conditions. As the temperature decreases, the internal friction of the oil increases, and the engine resistance torque increases, increasing the power required to start the engine.
The effect of fuel on engine starting performance is primarily its evaporative nature. As the temperature decreases, the viscosity and relative density of gasoline increase. Under low temperature conditions, the fluidity of diesel decreases and the viscosity increases, causing poor atomization of diesel and deteriorating the combustion process. After the temperature is further lowered, the fluidity of the fuel is gradually lost due to the precipitation of the waxy precipitate of the fuel.
If the diesel contains moisture, it may cause freezing in the supply system in winter and it will not work. Therefore, the diesel must be precipitated and filtered before use.
After entering the fall, the battery and starter should be maintained and maintained, the oxides on each connecting line should be removed, and the bolts of each connecting line should be tightened to make the joints firm. In addition, choosing the right electrolyte density has an important impact on the operation of the battery. Strengthening the insulation work of the winter battery or using a large-capacity battery in winter is also a measure to improve the engine starting performance.
2. Low temperature wear
During the engine's life cycle, 50% of cylinder wear occurs during start-up, while low temperature start has a greater impact on engine wear.
When the engine is started at low temperature, the main causes of the serious wear of the cylinder wall are: the lubrication condition of the cylinder wall is poor during the starting process; when the cold start, most of the fuel enters the cylinder in a liquid state, scouring the oil film on the cylinder wall.
Key points of construction machinery in low temperature
With the advent of winter, how to maintain and maintain equipment under low temperature has attracted the attention of the majority of drivers. In fact, the main problems with the use of equipment under low temperature conditions are the difficulty in starting the engine and the serious wear of the assembly. In addition, there are problems such as damage to the parts, corrosion (cylinder wall, exhaust pipe, etc.), poor thermal state of the assembly, and increased fuel and lubricant consumption.