阅读说明：本技术 一种发动机egr率直接测量方法及发动机egr阀总成 (Engine EGR rate direct measurement method and engine EGR valve assembly ) 是由 何笃算 于 2021-03-05 设计创作，主要内容包括：本发明公开了一种发动机EGR率直接测量方法及发动机EGR阀总成,包括以下步骤；S1计算发动机基础排温；S2根据发动机基础排温以及对应的公式算出废气的密度；S3空气流量计测量发动机的进气流量。本发明通过设计过滤网,可以有效的将回流管里汽车废气中的固体颗粒杂质过滤,避免了固体颗粒杂质通过回流管直接进入到燃烧室而造成燃烧室内壁的磨损,大大延长了燃烧室的使用寿命,同时也可以保证汽油在燃烧室内充分燃烧,通过限位块、限位孔、复位弹簧和连接杆的配合,实现了过滤网整体的快速拆装,通过复位弹簧对安装块的作用,可以大大的提高上箱体和下箱体安装的稳定性,从而达到便于更换的效果,解决了现有装置不便于更换的问题。(The invention discloses a method for directly measuring engine EGR rate and an engine EGR valve assembly, comprising the following steps of; s1 calculating the basic exhaust temperature of the engine; s2, calculating the density of the exhaust gas according to the basic exhaust temperature of the engine and a corresponding formula; the S3 air flow meter measures the intake air flow rate of the engine. According to the invention, by designing the filter screen, solid particle impurities in automobile exhaust gas in the return pipe can be effectively filtered, so that the problem that the solid particle impurities directly enter the combustion chamber through the return pipe to cause abrasion of the inner wall of the combustion chamber is avoided, the service life of the combustion chamber is greatly prolonged, meanwhile, gasoline can be ensured to be fully combusted in the combustion chamber, the filter screen is integrally and quickly disassembled and assembled through the cooperation of the limiting block, the limiting hole, the reset spring and the connecting rod, the installation stability of the upper box body and the lower box body can be greatly improved through the action of the reset spring on the installation block, the effect of convenience in replacement is achieved, and the problem that the existing device is inconvenient to replace is solved.)

1. A method for directly measuring an engine EGR rate, characterized by: comprises the following steps;

s1 calculating the basic exhaust temperature of the engine;

s2, calculating the density of the exhaust gas according to the basic exhaust temperature of the engine and a corresponding formula; s3, measuring the air intake flow of the engine by using an air flow meter;

s4, respectively installing a temperature sensor and a pressure sensor in front of and behind the EGR valve, controlling the opening of the EGR valve by an automobile engine control unit, and measuring the pressure and the temperature of an exhaust gas inlet of the EGR valve and the pressure and the temperature of an exhaust gas outlet of the EGR valve by using the temperature sensor and the pressure sensor;

s5 measuring the sectional area of the exhaust passage of the EGR valve;

s6, calculating the mass flow of the exhaust gas of the EGR valve according to a formula;

s7 calculates an engine EGR rate according to the formula.

2. An engine EGR valve assembly as defined in claim 1, wherein: comprises an air inlet pipe (1), the top of the air inlet pipe (1) is communicated with an air outlet pipe (2), the surface of the air outlet pipe (2) is sequentially provided with an electromagnetic valve (3) and a pressure sensor (4) from top to bottom, the left side of the air inlet pipe (1) is communicated with an EGR control valve body (5), the left side of the EGR control valve body (5) is communicated with a return pipe (6), the surface of the return pipe (6) is communicated with a filter box (7), the filter box (7) comprises an upper box body (71) and a lower box body (72), the inner cavities of the upper box body (71) and the lower box body (72) are fixedly connected with a buffer spring (8), the other end of the buffer spring (8) is fixedly connected with a buffer block (9), the inner cavity of the buffer block (9) is provided with a filter screen (10), and the front of the upper box body, the bottom fixedly connected with stopper (12) of fixed block (11), the front of stopper (12) is provided with spacing hole (13), the positive fixedly connected with machine case (14) of box (72) down, the front of machine case (14) is provided with through-hole (15), the inner chamber of through-hole (15) is provided with connecting rod (16), the surface cover of connecting rod (16) is equipped with reset spring (17), the positive fixedly connected with installation piece (18) of connecting rod (16).

3. An engine EGR valve assembly as defined in claim 2 wherein: the output end of the pressure sensor (4) is electrically connected with the input end of the electromagnetic valve (3) in a one-way mode, the filter screen (10) is circular, and the filter screen (10) is made of high-temperature-resistant metal.

4. An engine EGR valve assembly as defined in claim 2 wherein: the top of the lower box body (72) is fixedly connected with the surface of the return pipe (6), and the lower box body (72) is movably connected with the upper box body (71) through a hinge.

5. An engine EGR valve assembly as defined in claim 2 wherein: the inner cavity of the limiting hole (13) is provided with a clamping block (19), the clamping block (19) is trapezoidal, and the other end of the connecting rod (16) penetrates through the case (14) and extends to the inner cavity of the case (14).

6. An engine EGR valve assembly as defined in claim 2 wherein: the front surface of the return spring (17) is fixedly connected with the back surface of the mounting block (18), and the other end of the return spring (17) is fixedly connected with the front surface of the case (14).

7. An engine EGR valve assembly as defined in claim 2 wherein: go up box (71) inner chamber left and right sides equal fixedly connected with sealed pad (20), the shape of sealed pad (20) cross-section is the L type.

Technical Field

The invention relates to the technical field of EGR valves, in particular to a method for directly measuring an engine EGR rate and an engine EGR valve assembly.

Background

The exhaust gas recirculation is a technology for separating a part of exhaust gas of a small internal combustion engine for an automobile after combustion and introducing the exhaust gas into an air inlet pipe for re-combustion, and the main purpose is to reduce nitrogen oxides in the exhaust gas and improve fuel consumption rate when sharing partial load, taking the prefix 'EGR' of each English word as a general name, the EGR rate of the engine is the ratio between the mass flow of the EGR valve and the total air quantity of an engine cylinder, the current measurement method for the EGR rate of the engine on the whole automobile is indirectly obtained by the opening degree of the EGR valve, firstly measuring the corresponding EGR rate of the engine when the engine runs under different working conditions and the EGR valve is different in opening degree, namely the ideal EGR rate of the engine, taking the corresponding relation between the opening degree of the EGR valve and the EGR rate as a calibration basis, then measuring the actual opening degree of the EGR valve on the whole automobile, and obtaining the EGR rate of the engine according to the calibration basis, however, after the engine on the whole vehicle is used for a long time, a large amount of impurities are deposited on the hole wall of the EGR valve, and the accumulation of the impurities inevitably leads to the reduction of the hole diameter, so that the actual passing exhaust gas quantity of the engine on the whole vehicle is smaller than the exhaust gas throughput when in an ideal state, namely the actual EGR rate is smaller than the ideal EGR rate, the gasoline combustion performance is reduced, and the performance of the whole vehicle is influenced;

the method is an effective measure for reducing the emission of carbon monoxide at present, but excessive exhaust gas can affect the normal operation of the engine in circulation, and particularly when the engine is in idle speed, low speed and small load and is in cold state operation, the performance of the engine can be obviously reduced by the recirculated exhaust gas, therefore, an EGR valve is arranged in the exhaust gas recirculation to automatically adjust the amount of the exhaust gas participating in the exhaust gas recirculation according to the change of the working condition of the engine, in order to meet the requirements of reducing the content of pollutants discharged by an automobile and not reducing the performance index of the engine, the control requirement of the EGR valve is very accurate, however, most of the existing EGR valve assemblies do not have a filter screen structure, thereby can not effectually filter the solid particle impurity among the automobile exhaust in the exhaust pipe, and then appear solid particle impurity and directly enter into the combustion chamber through the air inlet and cause the combustion chamber inner wall to be worn and torn for a long time, greatly reduced the life of combustion chamber, in addition, when the filter screen uses for a long time, the jam can appear in its filtration pore, need dismantle it and wash, however, current usually can not dismantle fast, reduces work efficiency.

Disclosure of Invention

The invention aims to provide a method for directly measuring the EGR rate of an engine and an engine EGR valve assembly, which have the advantage of convenience in replacing a filter screen and solve the problem that the filter screen is inconvenient to replace in the conventional device.

In order to achieve the purpose, the invention provides the following technical scheme: a direct measurement method of engine EGR rate comprises the following steps;

s1 calculating the basic exhaust temperature of the engine;

s2, calculating the density of the exhaust gas according to the basic exhaust temperature of the engine and a corresponding formula; s3, measuring the air intake flow of the engine by using an air flow meter; s4, respectively installing a temperature sensor and a pressure sensor in front of and behind the EGR valve, controlling the opening of the EGR valve by an automobile engine control unit, and measuring the pressure and the temperature of an exhaust gas inlet of the EGR valve and the pressure and the temperature of an exhaust gas outlet of the EGR valve by using the temperature sensor and the pressure sensor; s5 measuring the sectional area of the exhaust passage of the EGR valve; s6, calculating the mass flow of the exhaust gas of the EGR valve according to a formula;

s7 calculates an engine EGR rate according to the formula.

An engine EGR valve assembly comprises an air inlet pipe, wherein the top of the air inlet pipe is communicated with an air outlet pipe, the surface of the air outlet pipe is sequentially provided with a solenoid valve and a pressure sensor from top to bottom, the left side of the air inlet pipe is communicated with an EGR control valve body, the left side of the EGR control valve body is communicated with a return pipe, the surface of the return pipe is communicated with a filter box, the filter box comprises an upper box body and a lower box body, the inner cavities of the upper box body and the lower box body are fixedly connected with buffer springs, the other ends of the buffer springs are fixedly connected with buffer blocks, the inner cavities of the buffer blocks are provided with filter screens, the front of the upper box body is fixedly connected with a fixed block, the bottom of the fixed block is fixedly connected with a limit block, the front of the limit block is provided with a, the inner chamber of through-hole is provided with the connecting rod, the surface cover of connecting rod is equipped with reset spring, the positive fixedly connected with installation piece of connecting rod.

Preferably, the output end of the pressure sensor is electrically connected with the input end of the electromagnetic valve in a one-way mode, the filter screen is circular, and the filter screen is made of high-temperature-resistant metal.

Preferably, the top of the lower box body is fixedly connected with the surface of the return pipe, and the lower box body is movably connected with the upper box body through a hinge.

Preferably, the inner cavity of the limiting hole is provided with a fixture block, the fixture block is trapezoidal, and the other end of the connecting rod penetrates through the case and extends to the inner cavity of the case.

Preferably, the front surface of the return spring is fixedly connected with the back surface of the mounting block, and the other end of the return spring is fixedly connected with the front surface of the case.

Preferably, the left side and the right side of the inner cavity of the upper box body are fixedly connected with sealing gaskets, and the cross sections of the sealing gaskets are L-shaped.

Compared with the prior art, the invention has the following beneficial effects:

1. according to the invention, by designing the filter screen, solid particle impurities in automobile exhaust gas in the return pipe can be effectively filtered, so that the problem that the solid particle impurities directly enter the combustion chamber through the return pipe to cause abrasion of the inner wall of the combustion chamber is avoided, the service life of the combustion chamber is greatly prolonged, meanwhile, gasoline can be ensured to be fully combusted in the combustion chamber, the filter screen is integrally and quickly disassembled and assembled through the cooperation of the limiting block, the limiting hole, the reset spring and the connecting rod, the installation stability of the upper box body and the lower box body can be greatly improved through the action of the reset spring on the installation block, the effect of convenience in replacement is achieved, and the problem that the existing device is inconvenient to replace is solved.

2. According to the invention, the connection stability of the upper box body and the lower box body is improved by designing the clamping block, the output end of the pressure sensor is electrically connected with the input end of the electromagnetic valve in a one-way mode, so that the automobile exhaust discharge rate is conveniently controlled, and the joint of the upper box body and the return pipe is sealed by designing the sealing gasket, so that the air tightness of the filter box is improved.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is an enlarged view of a portion of FIG. 1;

fig. 3 is a left side sectional view of the structure of the filter box of the invention.

In the figure: 1. an air inlet pipe; 2. an air outlet pipe; 3. an electromagnetic valve; 4. a pressure sensor; 5. an EGR control valve body; 6. a return pipe; 7. a filter box; 71. an upper box body; 72. a lower box body; 8. a buffer spring; 9. a buffer block; 10. a filter screen; 11. a fixed block; 12. a limiting block; 13. a limiting hole; 14. a chassis; 15. a through hole; 16. a connecting rod; 17. a return spring; 18. mounting blocks; 19. a clamping block; 20. and a gasket.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-3, a method for directly measuring an EGR rate of an engine includes the following steps;

s1 calculating the basic exhaust temperature of the engine;

s2, calculating the density of the exhaust gas according to the basic exhaust temperature of the engine and a corresponding formula; s3, measuring the air intake flow of the engine by using an air flow meter; s4, respectively installing a temperature sensor and a pressure sensor in front of and behind the EGR valve, controlling the opening of the EGR valve by an automobile engine control unit, and measuring the pressure and the temperature of an exhaust gas inlet of the EGR valve and the pressure and the temperature of an exhaust gas outlet of the EGR valve by using the temperature sensor and the pressure sensor; s5 measuring the sectional area of the exhaust passage of the EGR valve; s6, calculating the mass flow of the exhaust gas of the EGR valve according to a formula;

s7 calculates an engine EGR rate according to the formula.

An engine EGR valve assembly comprises an air inlet pipe 1, the top of the air inlet pipe 1 is communicated with an air outlet pipe 2, the surface of the air outlet pipe 2 is sequentially provided with a solenoid valve 3 and a pressure sensor 4 from top to bottom, the output end of the pressure sensor 4 is in one-way electric connection with the input end of the solenoid valve 3, the shape of a filter screen 10 is circular, the filter screen 10 is made of high-temperature-resistant metal, the connection stability of an upper box body 71 and a lower box body 72 is improved by designing a clamping block 19, the automobile exhaust emission rate is convenient to control by designing the one-way electric connection of the output end of the pressure sensor 4 and the input end of the solenoid valve 3, the joint of the upper box body 71 and a return pipe 6 is sealed by designing a sealing gasket 20, the air tightness of a filter box 7 is improved, the left side of the air inlet pipe 1 is communicated with an EGR control valve body 5, the, the filter box 7 comprises an upper box body 71 and a lower box body 72, the top of the lower box body 72 is fixedly connected with the surface of the return pipe 6, the lower box body 72 is movably connected with the upper box body 71 through a hinge, the left side and the right side of the inner cavity of the upper box body 71 are fixedly connected with sealing gaskets 20, the cross section of each sealing gasket 20 is L-shaped, the inner cavities of the upper box body 71 and the lower box body 72 are fixedly connected with a buffer spring 8, the other end of each buffer spring 8 is fixedly connected with a buffer block 9, the inner cavity of each buffer block 9 is provided with a filter screen 10, the front of the upper box body 71 is fixedly connected with a fixed block 11, the bottom of each fixed block 11 is fixedly connected with a limiting block 12, the front of each limiting block 12 is provided with a limiting hole 13, the top of the lower box body 72 is fixedly connected with the surface of the return pipe 6, the lower box body 72 is movably connected with the, the inner cavity of the through hole 15 is provided with a connecting rod 16, the surface of the connecting rod 16 is sleeved with a reset spring 17, the front of the reset spring 17 is fixedly connected with the back of the mounting block 18, the other end of the reset spring 17 is fixedly connected with the front of the case 14, the front of the connecting rod 16 is fixedly connected with the mounting block 18, by designing the filter screen 10, solid particle impurities in automobile exhaust gas in the return pipe 6 can be effectively filtered, the abrasion of the inner wall of a combustion chamber caused by the fact that the solid particle impurities directly enter the combustion chamber through the return pipe 6 is avoided, the service life of the combustion chamber is greatly prolonged, meanwhile, the gasoline can be ensured to be fully combusted in the combustion chamber, by the matching of the limiting block 12, the limiting hole 13, the reset spring 17 and the connecting rod 16, the integral quick assembly and disassembly of the filter screen 10 is realized, by the action of the reset spring 17 on the mounting block, thereby reach the effect of being convenient for change, solved the problem that current device is not convenient for change.

When the automobile exhaust gas purifier is used, exhaust gas flows in the air inlet pipe 1, the pressure sensor 4 detects the pressure inside the air inlet pipe 1, the pressure sensor 4 controls the electromagnetic valve 3 through the external controller, the automobile exhaust gas discharge rate is convenient to control, solid particle impurities in automobile exhaust gas in the return pipe 6 can be effectively filtered through designing the filter screen 10, abrasion of the inner wall of a combustion chamber caused by the fact that the solid particle impurities directly enter the combustion chamber through the return pipe 6 is avoided, the service life of the combustion chamber is greatly prolonged, meanwhile, the gasoline can be guaranteed to be fully combusted in the combustion chamber, when the filter screen 10 needs to be replaced, the mounting block 18 is stretched outwards, the connecting rod 16 is separated from the through hole 15, the upper box body 71 is turned over, the filter screen 10 is conveniently ejected through the action of the buffer block 9, the disassembly is completed, and the stability of the mounting of the upper box body 71 and the lower box body 72 can be greatly improved through the, thereby achieving the effect of convenient replacement.

In the description of this patent, it is to be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for the convenience of describing the patent and for the simplicity of description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the patent. In the description of this patent, it is noted that unless otherwise specifically stated or limited, the terms "mounted," "connected," and "disposed" are to be construed broadly and can include, for example, fixedly connected, disposed, detachably connected, disposed, or integrally connected and disposed. The specific meaning of the above terms in this patent may be understood by those of ordinary skill in the art as appropriate.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.