CN2365405Y

CN2365405Y - Diesel compression ignition petrol engine

Info

Publication number: CN2365405Y
Application number: CN97226389U
Authority: CN
Inventors: 贾凤斌
Original assignee: Individual
Current assignee: Individual
Priority date: 1997-11-05
Filing date: 1997-11-05
Publication date: 2000-02-23
Anticipated expiration: 2007-11-05

Abstract

The utility model relates to a dual fuel gasoline engine which makes use of compression ignition of diesel oil through application of a dipolar spraying way. A diesel oil atomizer and a gasoline atomizer are arranged inside a burning chamber of the utility model. The diesel oil sprayed from the diesel oil atomizer self-ignites to fire. Through the firing diesel oil, the gasoline sprayed from the gasoline atomizer is ignited. The diesel oil is mainly used when the utility model is under idle speed and low load. The gasoline is mainly used when the dual fuel gasoline engine is under medium and high load. When the dual fuel gasoline engine is used, the diesel oil and the gasoline can be well burned under each work condition, and pollution discharge is reduced. The dual fuel gasoline engine can use composite fuel of diesel oil and gasoline, or single diesel oil. The dual fuel gasoline engine has the advantage of good multiple flue capability. Low octane lead-free gasoline can be well burned by the dual fuel gasoline engine.

Description

A kind of petrol engine with the diesel oil compression-ignition

The present invention is a kind of petrol engine.It exactly is a kind of dual fuel gasoline machine that the two poles of the earth spray regime is used the diesel oil compression-ignition of using.

Generally gasoline is as petrol engine fuel, and its fuel economy is lower, and blowdown but is quite serious.Along with people to the continuous growth of energy demand with to the use of forbidding manufacture of the raising, particularly unleaded gas of environmental protection consciousness, thereby be necessary to improve the fuel economy of petrol engine and reduce its blowdown.Adopting stratified combustion is exactly the combustible gas that forms by the gasoline that spark ignitor is sprayed by oil sprayer with the controlled burning system of Texaco (Texaco tccs) that improves excess air coefficient and compression ratio, realizes the stratified mixture combustion of mixed gas.Same Germany external source igniting process (MAN FM) has also adopted stratified-charge technology, and they all have good fuel economy and pluralities of fuel, and blowdown is little.Combustion instability during idling particularly when but there is low-load in their ones, the shortcoming that blowdown is big, noise was big when the Racal multimode also existed this shortcoming and high speed.A kind of two-stage spray regime is arranged in diesel engine, it has main injection and secondary the injection, perhaps make secondary the injection play ignition action prior to main injection work, the secondary injection is right after after the main injection, and to increase the fuel injection quantity in the rapid combustion period, it is the excessive pressure of explosion and the rate of pressure rise of may command both, can improve combustion process again, for example the graceful grace of West Germany (MAN) company is at RV, and VV52/55 type middling speed machine has used the double-plunger high pressure oil pump to realize the two poles of the earth injection, and uses dual fuel on this basis.Using dual fuel good pluralities of fuel to be arranged with the mid low speed diesel fuel machine of heavy oil combustion, residual oil---this is very useful.Below mainly consult " automotive encyclopedia ", Ministry of Machine-Building Industry publishes.Above data shows: the first, controlling well after malcombustion and the blowdown problem, and improve compression ratio and increase excess air coefficient, help improving Fuel Petroleum Economy and pluralities of fuel; The second, must solve the particularly big shortcoming of the unstable blowdown of engine combustion during idling of low-load; The 3rd, it is favourable and feasible using dual fuel applications the two poles of the earth spray regime to use gasoline.

The objective of the invention is to remove to light gasoline with the diesel oil of pressuring combustion ignition, further improve the combustion efficiency of gasoline and strengthen the motor pluralities of fuel, and reduce the pollution in the discharging in the compression ignite mode.

The mode that the present invention adopts is: whole not by being arranged in diesel injector and the gasoline ejector in the firing chamber in the petrol engine compression, the a small amount of diesel oil that sprays into by diesel injector, the diesel oil involuntary ignition plays ignition action, light the formed gasoline mixture of big petrol that sprays into by gasoline ejector, so equal spontaneous combustion of diesel oil or gasoline or lighted, and then produce high-temperature high-pressure fuel gas and make the motor circulation of finishing the work, thereby make motor mainly use gasoline with compression ignite and ignition way.For realizing this working method, we are based on dual fuel diesel machine basis and use the two poles of the earth spraying technique simultaneously, remove the former engine body of reservation, connecting rod, distribution device, diesel oil supply system, lubricating system, cooling system, starting system etc., a change diesel engine cylinder cover and a newly-increased cover and diesel oil supply are that similar gas supply is; Adjust oil spout mechanism simultaneously, make bavin gasoline hybrid engine under different operating modes, the bavin gasoline proportionality is able to appropriately.

Therefore the present invention is than the ordinary diesel oil machine, and characteristics structurally are: have separate diesel oil to supply with system and gas supply system; In the firing chamber, arrange separate diesel injector and gasoline ejector; Diesel oil flows into diesel-oil filter through diesel fuel tanks and removes impurity, and the diesel oil oil transfer pump sucks diesel fuel injection pump with it, and diesel oil pressurizes through diesel fuel injection pump, sprays into firing chamber and involuntary ignition by diesel injector; Gasoline flows into gasoline filter through petrol tank and removes impurity, and the gasoline oil transfer pump sucks the gasoline Injection Pump with it, and gasoline sprays into the firing chamber through the pressurization of gasoline Injection Pump by gasoline ejector, and gasoline is lighted by the diesel oil of involuntary ignition and caught fire.

Practice shows, gasoline can be used for compression ignition engine, but the gasoline self-ignition point is 510 degrees centigrade, and its burning-point only is 280 degrees centigrade, thus simple compression ignite mode to use gasoline be difficult---job insecurity and starting difficulty phenomenon when this will cause serious engine knock and low speed.Thereby we have improved engine compression ratio and have increased excess air system in bavin gasoline hybrid engine, and enter the auxiliary pressuring combustion ignition in firing chamber at the whole diesel oil (diesel oil has good compression ignite characteristic) that do not spray of compression.Thereby in the present invention except the involuntary ignition of diesel oil or gasoline, comprise that also the passive of gasoline light.Stability during in fact for raising Fuel Petroleum Economy and low engine speed also obtains good emission effect, and we make it by diesel oil and gas supply system: only supply with diesel oil when 1) motor is in idling or low-load or mainly supply with diesel oil and a small amount of supply gasoline; 2) engine operation is then supplied with diesel oil on a small quantity and is mainly supplied with gasoline when middle high load; 3) fuel injection characteristic is: eventually not in engine compresses, diesel injector sprays into a small amount of diesel oil and plays ignition action, light the gasoline and the follow-up diesel oil that sprays into of diesel injector that spray into by gasoline ejector, thereby improve combustion process by the two poles of the earth spray regime of this dual fuel; 4) gasoline mixture can form early than the diesel oil mixed gas and also can be later than the formation of diesel oil mixed gas, use the former engine power performance good, but rough running (this is also relevant with firing chamber etc.), the latter is engine mildness then, noise is little and blowdown is few (Maximum operating temperature is lower) so---we generally use the latter.

More than show: 1) the present invention has mainly used the circulation of Diesel's level pressure, thereby the present invention than the regular gasoline machine have the higher thermal efficiency (compression ratio is big, excess air coefficient greatly, not throttling volumetric efficiency height), and (low then 16 values of octane value are inevitable high can well to use low-octane gasoline, compression ignition engine is desired just for this), thereby low-octane unleaded gas can well be used; 2) the present invention has used the two poles of the earth spraying technique, and it burns when idling and low-load well, and running is steady, and blowdown is reduced; 3) when gas supply system also supplied with diesel oil, motor was in the two poles of the earth injection diesel form of single oil plant; 4) the present invention can use fuel such as diesel oil-gasoline composite fuel or diesel oil, so it has good pluralities of fuel.

The present invention will be described below in conjunction with accompanying drawing 1 represented example.

Accompanying drawing 1 is the swirl combustion chamber shape sketch of this example motor, and wherein 1 is diesel injector, the 2nd, and gasoline ejector, the 3rd is inserted, the 4th, pre-burning igniting spray orifice, the 5th, air-flow path.

This example is to obtain by transforming a kind of four cylinder swirl chamber diesel engines.This instance compression ratio is chosen at 20, cylinder diameter 125MM, plunger diameter 7MM, each oil supply cylinder order 1342.Improve as follows: at first, improve cylinder cap and set up the gasoline ejector position, its swirl combustion chamber shape as shown in Figure 1, wherein the vortex chamber is flat, diesel oil and gasoline is all along eddy effusion, and wherein diesel injection direction is near the eddy current center, and the gasoline injection direction is slightly near vortex chamber's wall.Second increases gas supply system on the diesel engine basis, promptly increase petrol tank, gasoline filter, gasoline transport pipe, electric oil pump, gasoline Injection Pump, high-pressure oil pipe, gasoline ejector etc., wherein the volume ratio of diesel fuel tanks and petrol tank is according to the concrete purposes decision of motor, diesel injector and gasoline ejector all use the axial needle type injector of same model, consider the difficulty of on cylinder body, settling two cover Injection Pumps, so gasoline Injection Pump and diesel fuel injection pump are integrated, design as follows: 1) selecting 8 wheel cylinder II Injection Pumps for use is prototype; 2) with in the II fuel injection pump body vertically oil duct fourth, fifth wheel cylinder interval separate make it to form before and after (from drive end) two separate oil ducts; 3) former diesel oil oil input channel is constant, and the diesel oil of promptly former diesel oil transport pipe output still enters the upper body front oil duct through former inlet connector, and the crude oil pump spill valve is changed to petrol union, and gasoline enters oil duct behind the upper body thus, supplies with gasoline for four wheel cylinders in Injection Pump back; 4) diesel oil bleed screw aperture, crude oil pump front is strengthened, the diesel oil spill valve is installed herein; 5) transform fuel injection camshaft, make First Five-Year Plan wheel cylinder, two or six wheel cylinders, pseudo-ginseng wheel cylinder, four or eight wheel cylinder fuel feeding order unanimities respectively, and the fuel supply advance angle of preceding four diesel oil wheel cylinders is than back four bigger 2-10 degree of gasoline wheel cylinder fuel supply advance angle; For making maximum load mainly use gasoline, so restriction cam range, the largest loop fuel delivery that makes it the diesel oil wheel cylinder is not more than 1/2nd of engine calibration fuel delivery, and usually diesel oil largest loop fuel delivery is by the engine start decision; 6) adjust to roll and adjust cushion block in the frame and make diesel oil and gasoline wheel cylinder fuel supply advance angle accurate, and the fuel feeding angular interval is even between each wheel cylinder; 7) adjust fork fuel control mechanism.Make Injection Pump be in idling speed earlier, adjust control fork then and make the diesel oil wheel cylinder with the idling speed fuel delivery fuel feeding, the gasoline wheel cylinder is then adjusted to minimal circulation fuel delivery fuel feeding.

The example motor is main combustion diesel fuel when idling and low-load, mainly uses gasoline during middle high load, the work that the example motor can be stable under various operating modes; This example motor can only use diesel oil as fuel (being that gas supply system also supplies with diesel oil)---this moment, the example motor became the two poles of the earth spray regime diesel engine in fact in case of necessity.This example motor has good and economic, pluralities of fuel and blowdown few, and it can well use low-octane unleaded gas simultaneously.

Claims

1, the present invention is a kind of petrol engine, exactly is a kind of dual fuel gasoline machine that the two poles of the earth spray regime is used the diesel oil compression-ignition of using.Comprise body, connecting rod, distribution device, diesel oil supply system, gas supply system, lubricating system, cooling system, starting system etc., wherein gas supply system comprises petrol tank, gasoline filter, gasoline transport pipe, gasoline oil transfer pump, gasoline Injection Pump, high-pressure oil pipe, gasoline ejector etc.; It is characterized in that: be furnished with diesel injector and gasoline ejector in the firing chamber of the present invention, the diesel oil involuntary ignition that utilizes diesel injector to spray into removes to light the gasoline that gasoline ejector sprays into.