(1) Start-up temperature The cold diesel engine must be started at the lowest possible diesel engine speed and low ambient temperature.
The lower the diesel engine speed, the lower the final compression pressure and the lower the resulting temperature in the cylinder. At the same time, the reduction of the battery voltage at low temperatures also reduces the starting speed.
(2) Thermal diffusion and leakage Operating temperatures that do not meet the operating requirements of the piston ring can cause leakage. The cold diesel engine has thermal diffusion in the compression cycle. For diesel engines with separate combustion chambers, the thermal diffusion is severe due to the large surface of the combustion chamber.
(3) Friction loss The friction force of the mechanical components of the diesel engine is greater at the low temperature than at the normal operating temperature. As the temperature increases, the fluidity of the diesel engine oil increases, and the fitting clearance of the mechanical components also decreases.
(4) Fuel Regulation Fuel heating through the filter or direct heating of the fuel can avoid fuel problems at low temperatures due to paraffin wax crystallization. For modern diesel fuel, this problem only occurs when the temperature is below -25°C.
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