发布时间 : 星期二 文章汽车专业英语期末考更新完毕开始阅读
poor accuracy, as well as gushing painting a rate , gushing glib pressure and gushing oily time accuracy hard to control and so on , lead to dynamic athletics of diesel can not bring into full play, and exhaust to go beyond standard. Research indicates that, in general mechanical style gushes to gush under the control of accuracy painting regular time being controlled by 2° (crank shaft corner), but gush oil selecting every changing 10 °, fuel oil consumption is only capable to do increasing by 2%, HC increases by 16% with regard to row amount , the NOx row amount increases by 6%.
(1).The merit of diesel jetting
Comparing with mechanical tradition way, the electricity charges diesel oil for jetting system have the following merits :
①It has high accuracy of timing of jetting (higher than 0.5°) , reaction is faster; ②It can control the amounts of jetting rapidly,flexibly and accurately, gush oily amounts but adjustment , may come true jetting in advance, change gush the glib law;
③Gush oily pressure height (high-handed track electricity charges diesel for gushing glib pressure being up to 200 MPa systematically) , affected , optimized combustion process by engine rotation rate;
④It’s has no friction of the parting, the stability working over a long period of time are good;
⑤The structure is simple,reliable and convenient.It can apply again on the old and new engine by force.
(2).The type of electricity charges diesel for jetting system: The first generation diesel electromechanical charges adopt the location navar jetting system; The second generation diesel electromechanical charges adopt the duration control way jetting system.
(3).The essential principle of Electronic control diesel injection
The electricity charges diesel for jetting system be composed of 3 parts of sensors , controlling the element (ECU) and actuating mechanism. The sensor collects signals such as rotation rate , the temperature , pressure , rate of flow and accelerator pedal location, and imports real time detecting parameter a computer; ECU is that the electricity charges the systematic \center \, carries out comparison, arithmetic on the parameter value that the information coming from a sensor stores up deeply, to ascertain the working optimum parameter; That actuating
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mechanism gushes according to that the optimum parameter carries out under the control of, drive on gushing glib pressure , gushing oily amounts , gushing oily time , gushing the glib law and so on paints system , makes diesel duty reach the best. 3.The development of diesel technology on future automobile
Compare the petrol engine , the diesel are able to provide more powerful driving force and nicer fuel efficiency , the petrol engine’s low cost and relatively simpler fuel are to be that are what the diesel not have but under the control of. If synthesizing a diesel rude as well as, the petrol engine low cost, grinds the hair one new model engine again , what appearance its president becomes? The answer is Hyundai Motor to cooperating with Deerfu company , grind one internal money code name GDCI (Gasoline Direct-Injection Compression Ignition) engine , this engine is different from the rest that place depends on direct compression lights the fire , the sparking plug participates in unnecessarily.
Hyundai Motor cooperating with Deerfu , grinds GDCI , is to carry out an improvement on current petrol engine basis, on guarantee petrol engine’s low cost basis,they want to have more powerful force.The machine is still at experimental stage, be away from really popularizing time back to necessaries. GDCI compares with the petrol engine bringing a sparking plug along at present, it's fuel oil efficiency is able to improve 25%.
More different than the tradition petrol engine passes litten way of sparking plug, GDCI engine does not contain the sparking piston, air is able to pass warm-up before entering a combustion chamber ,the fuel not being able to gush the combustion chamber before the piston arrived at the TDC.So there are compressing the heated air in whole compression work.
When the piston stops burning on TDC, oil atomizer gushing a little fuel oil into the combustion chamber entering, after stopping burning on having pawned piston after, compression fuel is able to gush to this moment, combustion chamber, because air already warm-up and compression passes, under high-handed environment of high temperature, gush the fuel oil going in reaching the burning point combustion in the twinkling of an eye with air commixture , it’s unnecessarily ignite plug.
The homogeneous combustion is different from that point as we usually said, the recent HCCI engine route or distance of travel in the piston enters fuel oil with regard to already gushing into the combustion chamber , fuel oil and air already in the piston compression route or distance of travel sufficient commixture, be in a piston get to
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before going ahead stopping burning, with regard to the compound temperature already reaching burning point. First ,modern GDCI engine, have 40%'s close to air admission air may be made use of by repetition, this is thickness that can increase the nitrogen oxygen compound exhausting greatly because the gas compound burns just now after going ahead stopping burning,one aerofluxus making use of these in circle coming to be able to improve fuel oil efficiency, cut down tail gas nitrogen oxygen compound blowoff.
Besides the sparking plug is different, the engine has coincided with present gush the turbine pressure boost straightly within popular jar most , the engine has also carried modern GDCI matching advanced technologies such as gas correct time system , turbine pressure boost. There has no sparking plug gets in the way certainly , not, gush the glib implement \\position with regard to being able to substitute a sparking plug, fuel oil is gushed accurately to piston head central authority place. The GDCI engine compression ratio is 14.8:1 , this composes in reply masses 2.0 L TDI diesel oil engine 16.5:1 compression ratios approximation.
Be compared with the diesel , the GDCI engine need to be superior in stratagem disregarding aspect such as being to depend on fuel oil commixture degree , air cylinder wall energy loss or exploding to be shocked all , get same dynamic output, that maximal GDCI engine job pressure is maximal actuating pressure of diesel only one fifth, 1800 2000 bars gushing paint and pressure above relative diesel , the GDCI engine gushes the function painting pressure every aspect such as also moving towards 500 bar retinue , maximum actuating pressure and gushing the lessening painting pressure being able to optimize fuel oil , blowoff and noise.
According to what introduced the Hyunori government GDCI engine cost will will be under the control of horizontal being lower than diesel cost's ,GDCI engine gushing paints an implement mainly in order that the solenoid type gushes the glib implement, but gushing that the diesel oil engine uses paints an implement is to be that relatively higher piezoelectric cost style gushes the glib implement.
Sum up:GDCI engine is still at experiment stage at present.The official announced that the first Hyundai Motor who carry the GDCI engine hopeful to appear in the inner in 10 accepting in the experimental stage . Be if the GDCI engine able to compose in reply respective merit of diesel combining with a petrol engine really at that time? We adopt a wait-and-see attitude!
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