阅读说明：本技术 一种含氢气助燃料及主燃料高压共轨喷射系统 (Hydrogen-containing auxiliary fuel and main fuel high-pressure common rail injection system ) 是由 汪志友 于 2019-01-11 设计创作，主要内容包括：本发明公开一种含氢气助燃料及主燃料高压共轨喷射系统,其显著特征是将含氢气助燃料及主燃料通过共轨阵列引导至高压喷射器,并喷射到燃烧室内,从而提高燃烧效率、降低污染气体排放,并避免爆燃及回火等异常燃烧现象。(The invention discloses a hydrogen-containing auxiliary fuel and main fuel high-pressure common rail injection system, which is characterized in that the hydrogen-containing auxiliary fuel and the main fuel are guided to a high-pressure injector through a common rail array and are injected into a combustion chamber, so that the combustion efficiency is improved, the emission of polluted gas is reduced, and abnormal combustion phenomena such as deflagration, tempering and the like are avoided.)

1. A hydrogen-containing gas auxiliary fuel and main fuel high-pressure common rail injection system is characterized by comprising a hydrogen-containing gas auxiliary fuel generating and storing device (21), a hydrogen-containing gas auxiliary fuel pump (22), a hydrogen-containing gas auxiliary fuel filter (23), a hydrogen-containing gas auxiliary fuel vaporizer (24), a hydrogen-containing gas auxiliary fuel pressure regulator (25), a hydrogen-containing gas auxiliary fuel high-pressure common rail pipe (16), a liquefier (20), a main fuel supply device (19), a main fuel pump (28), a main fuel filter (27), a main fuel pressure regulator (26), a main fuel common rail pipe (13), a plurality of high-pressure injectors (18) and an electronic control system (29); the outlet of the hydrogen-containing gas-assisted fuel generating and storing device (21) is sequentially connected with a hydrogen-containing gas-assisted fuel pump (22), a hydrogen-containing gas-assisted fuel filter (23), a hydrogen-containing gas-assisted fuel vaporizer (24), a hydrogen-containing gas-assisted fuel pressure regulator (25) and a hydrogen-containing gas-assisted fuel high-pressure common rail pipe (16) in series through pipelines, a hydrogen-containing gas-assisted fuel pressure valve (17) on the hydrogen-containing gas-assisted fuel high-pressure common rail pipe (16) is connected with a liquefier (20) through a return pipeline, and the outlet of the liquefier (20) is connected with the inlet of the hydrogen-containing gas-assisted fuel generating and storing device (21) through a pipeline; the outlet of the main fuel supply device (19) is sequentially connected with a main fuel pump (28), a main fuel filter (27), a main fuel pressure regulator (26) and a main fuel high-pressure common rail pipe (13) in series through pipelines, and a main fuel pressure valve (14) on the main fuel common rail pipe (13) is connected with the inlet of the main fuel supply device (19) through a main fuel return pipeline; a hydrogen-containing gas auxiliary fuel guider (5) in the high-pressure injector (18) is connected with the hydrogen-containing gas auxiliary fuel high-pressure common rail pipe (16) in parallel, and a main fuel guider (11) is connected with the main fuel high-pressure common rail pipe (13) in parallel; under the action of an electronic control system (29), hydrogen-containing auxiliary fuel and main fuel enter the high-pressure common rail pipe arrays (13, 16) and are injected into the combustion chamber by a high-pressure injector (18).

2. The hydrogen-containing auxiliary fuel main fuel high-pressure common rail injection system according to claim 1, wherein the electronic control system (29) is electrically connected to the fuel system including the hydrogen-containing auxiliary fuel generating and storing device (21), the hydrogen-containing auxiliary fuel pump (22), the hydrogen-containing auxiliary fuel pressure regulator (25), the main fuel supply device (19), the main fuel pump (28), the main fuel pressure regulator (26), the hydrogen-containing auxiliary fuel high-pressure common rail (16), the liquefier (20), the main fuel high-pressure common rail (13), and the plurality of high-pressure injectors (18); the electronic control system (29) reads MAP according to the working condition of the combustor, adjusts and controls the pulse width of the high-pressure injector (18) through a driving program, and controls the proportion of two fuel supply modes; the hydrogen-containing auxiliary fuel generating and storing device (21) is also controlled through feedback regulation; the main fuel supply (19) is also controlled by feedback regulation.

3. The hydrogen-containing co-fuel and main-fuel high-pressure common rail injection system according to claim 1, wherein the common rail array is composed of a hydrogen-containing co-fuel common rail (16), a main-fuel common rail (13), a hydrogen-containing co-fuel return pipe, a main-fuel return pipe, and is connected to the electronic control system (29), the hydrogen-containing co-fuel generating and storing device (21), the main-fuel supply device (19), and the high-pressure injector (18); the common rail pipe is provided with a pressure gauge and a pressure sensor and is connected with a high-pressure pump (22) and a high-pressure ejector (18).

4. The high-pressure common rail injection system of hydrogen-containing auxiliary fuel and main fuel as set forth in claim 1, wherein the hydrogen-containing auxiliary fuel generating and storing device (21) is generated on-line from the hydrogen-containing auxiliary fuel under the action of the control system and is compressed to enter the hydrogen-containing auxiliary fuel storing device (21); the hydrogen-containing auxiliary fuel generating and storing device also comprises a filter (27) and a pressure regulator (25) for regulating the pressure of the fuel; the hydrogen-containing auxiliary fuel comprises but is not limited to hydrogen and oxygen mixed gas HHO prepared by electrolyzing water, hydrogen prepared by electrolyzing ammonia, hydrogen and mixed gas prepared by various pyrolysis, water gas, hydrogen-containing plasma and hydrogen-containing hydrocarbon mixed gas; the main fuel comprises liquid fuels such as gasoline, diesel oil, methanol, ethanol, dimethyl ether and the like.

5. The high-pressure common rail injection system for the hydrogen-containing auxiliary fuel and the main fuel is characterized in that the high-pressure injector comprises a needle valve (7) arranged in a piston cavity of the injector, a lifting sensor (6) and a lifting device which are sleeved on the needle valve, and an electromagnetic control servo valve (2), a push-pull rod (12), a high-pressure working medium guider (4), a hydrogen-containing auxiliary fuel guider (5) and a main fuel guider (11) which are arranged at the tail part of the injector; the high-pressure injector (18) receives a fuel injection command signal from an electronic control system (29), an injection driving program generates strong driving current at a cable (1) to act on an electromagnetic body (2), so that an electromagnetic servo valve (3) moves upwards, an outlet of a high-pressure working medium conductor (4) is opened, the pressure between a fluid control upper partition plate (8) and a fluid control upper partition plate (9) is rapidly reduced, the pressure from the fuel conductor enables a push-pull rod (12) to be lifted, a needle valve (7) is opened, high-pressure fuel is sprayed, when the command signal is stopped and the current is cut off, the electromagnetic servo moves downwards, the outlet of the high-pressure working medium conductor (4) is closed, the pressure between the fluid control upper partition plate (8) and the fluid control upper partition plate (9) is rapidly increased, and as a result, the push-pull rod (12) moves downwards, the needle valve (7) is pushed to a.

6. The high-pressure injector as claimed in claim 5, characterized in that the high-pressure working medium guide (4) is sealed off from the fuel guide (5, 11) by an O-ring and by a ring-shaped sleeve made of Teflon; the highest pressure of the high-pressure working medium guider (4) is 300 MPa; the fuel guide (5, 11) has a maximum pressure of 30 MPa; the included angle between the needle hole of the needle valve (7) and the axial center line of the injector (18) is 90 degrees; the size of the jet hole of the auxiliary fuel guide (5) is 0.1-0.3mm, and the size of the jet hole of the main fuel guide (11) is 0.4-0.8 mm; the combustion-supporting material sprayed by the high-pressure injector (18) accounts for 5%, 10%, 15%, 20% and 25% of the mass of the sprayed main fuel.

Technical Field

The invention relates to a fuel injection system, and belongs to the technical field of internal combustion engine systems.

Background

The existing injection system of the hydrogen-containing auxiliary fuel and fuel internal combustion engine limits the response speed and the combustion efficiency of fuel supply to a certain extent, thereby influencing the power performance and the economic index of the engine. Especially at higher engine speeds, where cylinder crank angle limits injector dwell time, the thermal efficiency of the engine may become worse. Therefore, it is desirable to develop injection systems that can be activated at very small crank angles to improve combustion efficiency and correspondingly reduce the emission levels of nitrogen oxides, NOx. In addition, the conventional hydrogen fuel internal combustion engine mostly adopts air passage injection, namely an injection mode of performing cylinder-outside premixing with compressed air. The disadvantage of this is that the residual hydrogen in the gas channel can cause abnormal combustion phenomena such as backfire and the like; in addition, the mixed gas of hydrogen and air has the tendency of pre-ignition and detonation in the compression process, which not only affects the efficiency of the engine, but also greatly shortens the service life of the engine.

Disclosure of Invention

In order to solve the defects in the technical field, the invention provides a hydrogen-containing auxiliary fuel and main fuel high-pressure common rail injection system which is used for improving the combustion efficiency of the conventional internal combustion engine, reducing the emission of polluted gas and avoiding abnormal combustion such as deflagration, backfire and the like.

In order to achieve the purpose, the technical route adopted by the invention is as follows: the design of a plurality of injection points ensures that the injectors are connected with the common rail system of the internal combustion engine in parallel, and the characteristic that the fluid pressure of the working medium is large enough is utilized, so that the injectors are triggered faster under higher fluid pressure to push the injectors to work in a linkage manner to inject auxiliary fuel and main fuel containing hydrogen, and the combustion efficiency of the internal combustion engine is greatly enhanced.

The more specific technical scheme is as follows:

a hydrogen-containing gas auxiliary fuel and main fuel high-pressure common rail injection system comprises a hydrogen-containing gas auxiliary fuel generating and storing device, a hydrogen-containing gas auxiliary fuel pump, a hydrogen-containing gas auxiliary fuel filter, a hydrogen-containing gas auxiliary fuel vaporizer, a hydrogen-containing gas auxiliary fuel pressure regulator, a hydrogen-containing gas auxiliary fuel high-pressure common rail pipe, a liquefier, a main fuel supply device, a main fuel pump, a main fuel filter, a main fuel pressure regulator, a main fuel common rail pipe and an electronic control system;

the high-pressure ejector comprises a needle valve arranged in an ejector piston cavity, a lifting sensor and a lifting device which are sleeved on the needle valve, and an electromagnetic control servo valve, a push-pull rod, a high-pressure working medium guider, a hydrogen-containing auxiliary fuel guider and a main fuel guider which are arranged at the tail part of the ejector;

the outlet of the hydrogen-containing gas-assisted fuel generating and storing device is sequentially connected with a hydrogen-containing gas-assisted fuel pump, a hydrogen-containing gas-assisted fuel filter, a hydrogen-containing gas-assisted fuel vaporizer, a hydrogen-containing gas-assisted fuel pressure regulator and a hydrogen-containing gas-assisted fuel high-pressure common rail pipe in series through pipelines, a hydrogen-containing gas-assisted fuel pressure valve on the hydrogen-containing gas-assisted fuel high-pressure common rail pipe is connected with a liquefier through a return pipeline, and the outlet of the liquefier is connected with the inlet of the hydrogen-containing gas-assisted fuel generating and storing device through a pipeline; the outlet of the main fuel supply device is sequentially connected with a main fuel pump, a main fuel filter, a main fuel pressure regulator and a main fuel high-pressure common rail pipe in series through pipelines, and a main fuel pressure valve on the main fuel common rail pipe is connected with the inlet of the main fuel supply device through a main fuel return pipeline; the hydrogen-containing gas auxiliary fuel guider in the high-pressure injector is connected with the hydrogen-containing gas auxiliary fuel high-pressure common rail pipe in parallel; the main fuel guider is connected with the main fuel high-pressure common rail pipe in parallel;

the electronic control system is connected with the hydrogen-containing gas-assisted fuel generating and storing device, the hydrogen-containing gas-assisted fuel pump, the hydrogen-containing gas-assisted fuel pressure regulator, the main fuel supply device, the main fuel pump, the main fuel pressure regulator, the hydrogen-containing gas-assisted fuel high-pressure common rail pipe, the liquefier, the main fuel high-pressure common rail pipe and the plurality of high-pressure injectors through circuits; the electronic control system reads MAP according to the working condition of the combustor, adjusts and controls the pulse width of the high-pressure injector through a driving program, controls the proportion of two fuel supply modes, and controls the generation and storage device of the hydrogen-containing auxiliary fuel and the main fuel supply device through feedback adjustment; the electronic control system automatically enables the hydrogen-containing auxiliary fuel and the main fuel to enter the high-pressure common rail pipe array according to a program and the hydrogen-containing auxiliary fuel and the main fuel are sprayed into a combustion chamber through a high-pressure injector;

further, the hydrogen-containing auxiliary fuel generating and storing device generates hydrogen-containing auxiliary fuel on line under the action of a control system, and the hydrogen-containing auxiliary fuel is compressed and enters the hydrogen-containing auxiliary fuel storing device; the hydrogen-containing auxiliary fuel generating and storing device also comprises a filter and a pressure regulator, and is used for regulating the pressure of the fuel;

further, the high-pressure injector receives a fuel injection command signal from an electronic control system, an injection driving program generates strong driving current at a cable to act on an electromagnet, so that an electromagnetic servo valve moves upwards, an outlet of a high-pressure working medium conductor is opened, the pressure between the fluid control upper partition plate and the fluid control upper partition plate is rapidly reduced, the pressure from the fuel conductor enables a push-pull rod to ascend, a needle valve is opened, and high-pressure fuel is sprayed out;

preferentially, a pressure gauge and a pressure sensor are arranged on the common rail pipe;

preferentially, the hydrogen-containing auxiliary fuel is mixed gas HHO for preparing hydrogen and oxygen by electrolyzing water, hydrogen prepared by electrolyzing ammonia water and various hydrogen and mixed gas prepared by pyrolysis;

preferably, the primary fuel is gasoline and diesel;

preferably, the high-pressure working medium guider and the fuel guider are sealed by an O-shaped ring and a circular sleeve made of Teflon;

preferably, the fluid pressure of the high-pressure working medium guider is 200 MPa;

preferably, the fluid pressure of the fuel guide is 20 mpa;

preferentially, the included angle between the needle valve needle hole and the central line of the injector shaft is 90 degrees;

preferably, the pilot fuel injector orifice size is 0.2mm;

preferably, the main fuel pilot injection hole size is 0.5 mm;

preferably, the combustion-supporting material sprayed by the injector accounts for 10-15% of the mass of the sprayed main fuel.

The invention has the beneficial effects that:

(1) quick response: under the action of high-pressure working medium fluid, the ejector can form quick response with the speed matched with the combustion speed;

(2) and (3) precise control: the electronic control system accurately controls the injection time, the injection fuel proportion and the injection pulse width to accurately control the content of the hydrogen-containing auxiliary fuel, so that the auxiliary fuel sprayed by the high-pressure injector accounts for 10-15% of the mass of the sprayed main fuel;

(3) high combustion efficiency: due to the quick response of the high-pressure ejector and the accurate program control of an electronic control system, the combustion efficiency of the internal combustion engine reaches more than 40 percent;

(4) low pollution emission: because the combustion efficiency of the internal combustion engine is high, and measures such as exhaust emission cyclic combustion, Selective Catalytic Reaction (SCR) and rapid detection and regulation in the system are added, the emission of nitrogen oxides NOx of the internal combustion engine can reach the national standard.

Drawings

FIG. 1 is a schematic diagram of the hydrogen-containing co-fuel and main fuel high pressure injector of the present invention.

Fig. 2 is a schematic diagram of a high-pressure common rail injection system of hydrogen-containing auxiliary fuel and main fuel.

Wherein: 1-a cable; 2-electromagnetism; 3-a servo valve; 4-a working medium conductor; 5-hydrogen containing fuel-assisted conductor; 6-a pull-up sensor; 7-needle valves; 8-a fluid control upper baffle; 9-a fluid-controlled lower baffle; 10-working medium return; 11-a main fuel conductor; 12-a push-pull rod; 13-main fuel high pressure common rail; 14-a main fuel pressure valve; 15-a valve; 16-hydrogen containing fuel high pressure common rail; 17-hydrogen containing fuel assist pressure valve; 18-a high pressure ejector; 19-main fuel supply; 20-a liquefier; 21-a hydrogen-containing fuel assist storage device; 22-hydrogen containing fuel assist pump; 23-a hydrogen containing fuel assist filter; 24-a vaporizer; 25-hydrogen containing fuel assist pressure regulator; 26-a main fuel pressure regulator; 27-a main fuel filter; 28-main fuel pump; 29-electronic control system.

The specific implementation mode is as follows:

the invention will be further described with reference to the following figures and specific examples, but the scope of the invention is not limited thereto.