The starting of the engine is not only determined by its own technical condition, but also affected by the outside temperature.

Starting is more difficult at low temperatures in winter, mainly due to the following reasons:

(1) In winter, the climate is cold, the ambient temperature is low, the viscosity of the machine increases, and the friction resistance of each moving part increases, which reduces the starting speed and makes it difficult to start.

(2) The battery capacity decreases as the temperature drops, further reducing the starting speed.

(3) Due to the decrease of the starting speed, the leakage of compressed air increases, and the heat dissipation of the cylinder wall increases, resulting in a large decrease in the temperature and pressure of the air at the end of compression, which increases the delay period of diesel ignition, and even fails to burn in severe cases.

(4) The viscosity of diesel oil at low temperature increases, which reduces the injection speed. In addition, the swirl velocity, temperature and pressure of the air at the end of compression are relatively low, so that the atomization quality of diesel fuel injected into the cylinder is poor, and it is difficult to quickly mix with air. Form a good combustible gas and ignite and burn in time, or even fail to catch fire, resulting in difficulty in starting.