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The ignition timing
The moment of ignition of the working mixture. The combustion of the working mixture in the combustion chamber of the engine cylinder occurs in for a certain time. The angle of rotation of a cranked the motor shaft after the onset of spark discharge in the candle to the position at which the piston is at TDC is called ignition timing. In case of early ignition (great timing for- gigane) there is a sharp increase in pressure, prevents sponding movement of the piston, resulting in a reduction the output and efficiency of the engine, overheating and procedure for removing the detonation knocks. Toxicity increases from- working gases. At idle the engine work melts is unstable. In case of late ignition (small advance angle at- gigane) the ignition of the working mixture occurs at DWI- of the piston after TDC. The gas pressure cannot to achieve the required value, causing a weaker tion of power and fuel economy. Temperature from- working gas is increased, there is an overheating DWI gates. Time period represented in the working stroke movement gates of combustion of the working mixture, decreases with an increase of the rotational speed of the crankshaft. And the speed shore- tion mixture changes insignificantly. Therefore, with increasing the frequency of rotation of a cranked shaft it is necessary to increase and the ignition timing. At a constant value the rotational speed of the crankshaft and with the increase in load- CI engine decreases the amount of residual gases in the combustion chamber and the speed of combustion of the working mixture zoom lost, causing the need to reduce the angle ignition timing. This implies that the ignition timing Dol- wives be adjusted automatically based on speed and the load operating conditions of the engine. Device to facilitate starting of the engine. To them the include: • starting fluid "Arctic", "Cold 40"; • glow plugs for diesel engines; • electrically air preheaters; • electric batteries; • preheater. Electrically air heater is used to cold start diesel engines at temperatures of the who- spirit to -25°C With the use of winter oils, and to -18°C when using conventional oils. The principle of operation of electronic tropicarnage of the air preheater is based on the evaporation fuel pin plugs and ignition fuel vapors mixed with air. Arising from this the torch warms up the engine cylinders to the who- the spirit that facilitates engine starting at low temperatures air. Heating batteries may be internal him when the electrolyte is placed in the heater power- TEW 600 watts. Heating of the electrolyte allows for a short time bedrooms at low temperatures to improve the curve Tiki batteries. For outdoor heating used containers heated with warm air or electrical coils placed in the shell, the Torah is covered battery. Preheater allows prestarting warming up of the engine when the temperature of the air ha to -60°C due to heating of the coolant system the theme of cooling. Heating time, cooling liquid STI, start and warm engine at idle with the use of pad heated heater Accu- molatore battery when the air temperature is -60°C is equivalent zhno to exceed 45 minutes. Current consumption inrush heater battery battery mode- reheats 30-40 A. |
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