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Four of diesel engine startup mode in low temperature

Creation:Hooray Source:Hooray Machinery Release Time:2016-11-15 21:43

Abstract:under the condition of low temperature fuel viscosity increase and not conducive to the atomization and combustion of the fuel, lubricating oil liquid movement components varying errand in the resistance increase, coupled with the ability to reduce the in
under the condition of low temperature fuel viscosity increase and not conducive to the atomization and combustion of the fuel, lubricating oil liquid movement components varying errand in the resistance increase, coupled with the ability to reduce the influence of such factors as battery work, easy to cause the engine starting difficulties, engine wear, reduce power, fuel consumption increase and dynamic performance. In order to ensure all kinds of construction machinery in cold conditions can safely be put into use, shall do a good daily maintenance, had better install auxiliary startup system at low temperature.

Four common ways of low-temperature start

(1) filling fluid of cold start

Cold start liquid is a kind of auxiliary starting fuel (by ether, low volatile hydrocarbons and cold-test oil with additives), low-freezing oil with additives into them can improve the lubrication condition of the cylinder wall, achieve the goal of start. Because ether volatile, easy to ignite and has good compression, so the more the content of ethyl ether, diesel engine can directly start the lower temperature, but starts rough degree will have the greater the diesel engine work. Therefore, when using the cold start fluid must be in accordance with the specified amount, not too much to join. Although the start method can start the engine in an instant, but due to the low oil temperature, viscosity is high, over a period of time after launch oil cylinder wall, lubrication conditions, engine working time for reciprocating motion and rotational motion of parts in the body, can form dry friction between parts wear; Therefore, the use of cold starting fluid start engine don't step on the gas after the operation, choose this way to start, choose the good starting liquid atomization situation, and control the position of injection time, injection amount and injection. In addition, avoid by all means from the air inlet of the air cleaner spray directly into the starting fluid, so as not to affect the quality of the air filter element and increase the injection quantity of lifting liquid, causes the engine cold machine start running speed. According to the above, it is suggested that careful cold fluid.

(2) the flame preheating start-up

The lowest working temperature of flame preheater is to 40 ℃, the working process for electronic automatic control. Flame preheating starting device generally by the electronic controller, electromagnetic valve, temperature sensors, flame preheating plug and fuel pipe and wire. Working process, the device will glow plug on starter after heated to 850-850 ℃, electromagnetic valve automatically open circuit, electric plug oil via the fuel pipe, the flame preheat start, after using the device to start the engine, due to low oil temperature, viscosity is high at this time, for a period of time after launch oil cylinder wall, lubrication conditions, engine working time for reciprocating motion and rotational motion of parts in the body, also can form dry friction between parts wear; Due to the friction generated in the high temperature can make the friction surface of metal melt, easily to stuck the parts. Therefore, using flame preheater after start engine should also don't step on the gas operation, otherwise easily cause cylinder accident.

(3) circulating water heating system (also called fuel oil heater heating system)

This is in the low temperature aided in recent years, a new start, the low temperature start way is through fuel oil heater. The attached water pump out the engine cooling fluid in the body, through the fuel oil heater heating recirculation to engine after its in the body, to heat the engine, under the condition of low temperature starting the engine.

This way of low-temperature start of the heating process must be 30-40 min, the engine can be heated to a temperature of about 40-50 ℃, the body temperature of the engine oil is heated, the oil viscosity is reduced, the engine at low temperature under the condition of lubrication conditions improve, make the engine start smoothly. This way of low-temperature start advantage obviously, make the engine under the condition of low temperature cold start performance is greatly improved, recommended. ZLG50C plateau type loader, TLG210A plateau type bulldozer adopted this way of low temperature start, start the effect is good.

(4) the other way of preheating

Except the preheating method, also can use hot water preheating method (heat to boiling point of water injection cooling system) steam preheating method (vapor from a tank through a pipeline on the pipe into the cooling system, or directly into the engine cooling jacket), preheating method (insert heater direct cooling system or oil inside, this method high thermal efficiency, use more convenient), such as a variety of methods to start in low temperature.

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