CN111412060A

CN111412060A - Gas engine backfire simulation test device and method

Info

Publication number: CN111412060A
Application number: CN202010325060.6A
Authority: CN
Inventors: 张冠旭; 庄建兵; 李冰
Original assignee: United Automotive Electronic Systems Chongqing Co Ltd
Current assignee: United Automotive Electronic Systems Chongqing Co Ltd
Priority date: 2020-04-23
Filing date: 2020-04-23
Publication date: 2020-07-14

Abstract

The invention discloses a gas engine backfire simulation test device which comprises a combustion chamber cylinder body, a security chamber cylinder body and a controller, wherein a compressed air pipe seat, a gas pipe seat, a first cylinder pressure sensor, an ignition device and a safety relief valve are inserted in the combustion chamber cylinder body; the gas pipe seat is connected with a gas supply system through a second electromagnetic valve; an exhaust valve and a second cylinder pressure sensor are inserted on the cylinder body of the security chamber, and one end of the cylinder body of the security chamber is connected with a full-closed valve. The invention can rapidly and completely simulate the tempering process of the gas engine and provide a real, safe and reliable engine tempering test environment for the parts of the gas engine air inlet system; and air and gas can be fully mixed, the phenomenon of insufficient combustion can be effectively avoided, the test can be continuously carried out, and the test efficiency is high.

Description

Gas engine backfire simulation test device and method

Technical Field

The invention relates to the field of throttle valve testing, in particular to a gas engine backfire simulation test device and method.

Background

Flashback is the phenomenon of abnormal ignition of fuel in the intake port in a fuel engine intake system, the pressure of which deflagration impacts the engine intake components. In the field of gas engines, the service life of parts of a gas engine gas inlet system determines the service life of the whole engine, and along with the increase of the discharge capacity of the gas engine, the increasingly large inlet supercharging pressure brings a more severe operating environment for parts of the gas inlet system. The mixed gas with the supercharged gas and air is mixed in the gas inlet channel, and if the vehicle owner cannot maintain the vehicle timely and the ignition timing is advanced, the gas inlet system of the gas engine can be tempered. The increased tempering pressure can generate huge tempering stress, and parts impacting an air inlet passage of the engine, particularly a throttle valve, are easy to damage during tempering. At present, many part manufacturers in China improve the design of throttle products according to tempering stress, but at present, no real gas tempering test equipment exists for verifying whether the improved throttle products meet the tempering pressure requirement. In order to verify whether the newly designed product meets the tempering requirement of the gas engine, a set of tempering test equipment for truly simulating the tempering environment of the gas engine needs to be designed.

Disclosure of Invention

The invention aims to solve the technical problem of providing a gas engine backfire simulation test device and method with adjustable backfire pressure range and high backfire test speed.

The technical scheme of the invention is as follows:

a gas engine backfire simulation test device comprises a combustion chamber cylinder body, a security chamber cylinder body and a controller, wherein a combustion chamber is arranged in the combustion chamber cylinder body, a compressed air pipe seat, a gas pipe seat, a first cylinder pressure sensor, an ignition device and a safety pressure release valve are inserted in the combustion chamber cylinder body, one end of the combustion chamber cylinder body is provided with an opening, and the opening end of the combustion chamber cylinder body is used for being connected with a first end of a throttle valve to be tested; the combustion chamber is internally provided with a gas mixing inclined plane, the insertion end ports of the compressed air pipe seat and the gas pipe seat face the gas mixing inclined plane, the compressed air pipe seat is connected with a first electromagnetic valve, and the first electromagnetic valve is connected with an air pressurization system; the gas pipe seat is connected with a second electromagnetic valve, and the second electromagnetic valve is connected with a gas supply system; the first cylinder pressure sensor is connected with a first combustion analyzer;

the safety chamber is arranged in the safety chamber cylinder body, an exhaust valve and a second cylinder pressure sensor are inserted in the safety chamber cylinder body, the second cylinder pressure sensor is connected with a second combustion analyzer, an opening is formed in one end of the safety chamber cylinder body, the opening end of the safety chamber cylinder body is connected with a full-closing valve, and the full-closing valve is used for being connected with the second end of the throttle valve to be detected; and the ignition device, the first electromagnetic valve, the second electromagnetic valve, the full-closing valve and the exhaust valve are all electrically connected with the controller.

The gas burner is characterized by further comprising a first one-way valve and a second one-way valve, wherein the compressed air pipe seat is connected with the first electromagnetic valve through the first one-way valve, and the gas pipe seat is connected with the second electromagnetic valve through the second one-way valve.

Furthermore, an oxygen pipe seat is inserted into the combustion chamber cylinder body, and the oxygen pipe seat and the gas pipe seat are symmetrically arranged; the oxygen tube seat is connected with a third one-way valve, the third one-way valve is connected with a third electromagnetic valve, the third electromagnetic valve is connected with an oxygen input system, and the third electromagnetic valve is also electrically connected with the controller.

Further, the combustion chamber cylinder body and the security chamber cylinder body are both cylindrical, the combustion chamber and the security chamber are also both cylindrical, and the lower end of the combustion chamber cylinder body is fixedly provided with a base.

Furthermore, a digital display pressure gauge is inserted on the cylinder body of the security room.

Further, the controller is electrically connected with a test control switch and a continuous test switch.

Further, the controller is electrically connected with an indicator light module, and the indicator light module comprises a plurality of indicator lights.

A gas engine backfire simulation test method adopts the gas engine backfire simulation test device of any one of the above, and comprises the following steps:

step S1, connecting the throttle valve to be tested with a gas engine backfire simulation test device;

step S2, detecting whether the test control switch is closed, if so, executing step S3, otherwise, returning to execute step S2;

step S3, injecting compressed air into the combustion chamber to increase the air pressure in the combustion chamber to a preset value;

step S4, injecting fuel gas into the combustion chamber to enable the ratio of the fuel gas to the compressed air to reach a preset ratio;

step S5, igniting by an ignition device, and respectively collecting the air pressure of a combustion chamber and the air pressure of a security chamber in the combustion process;

step S6, opening a throttle valve to be tested, opening an exhaust valve and a full-closing valve, injecting compressed air into the combustion chamber, and discharging waste gas in the combustion chamber;

step S7, stopping injecting compressed air, and closing the throttle valve, the exhaust valve and the full-closing valve to be tested;

step S8, whether the continuous test switch is closed or not is detected, if the continuous test switch is closed, the step S3 is executed, and if the continuous test switch is not closed, the step S9 is executed;

and step S9, ending the test, judging whether the combustion is uniform in the test process according to the test data, and judging the quality of the throttle valve to be tested.

Further, when the air pressure value generated by the air pressurization system is smaller than the air pressure value required for generating the target air pressure, after step S4 is executed, the following steps are executed:

step S401, a predetermined amount of oxygen is injected into the combustion chamber.

Further, the amount of the compressed air and the gas injected into the combustion chamber is controlled by setting the time for injecting the compressed air and the gas into the combustion chamber at the controller.

Has the advantages that: the invention can rapidly and completely simulate the tempering process of the gas engine and provide a real, safe and reliable engine tempering test environment for the parts of the gas engine air inlet system; the cylinder body of the combustion chamber is provided with the gas mixing inclined plane and the positions of the gas inlet pipe seats are reasonably determined, so that air and gas are fully mixed, the phenomenon of insufficient combustion can be effectively avoided, the continuous test can be carried out, the test efficiency is high, the tempering impact can be carried out for more than 800 times every day, and the fluctuation range of the pressure can be controlled within +/-0.05 MPa.

Drawings

FIG. 1 is a schematic structural diagram of an embodiment of a gas engine backfire simulation test device of the present invention;

FIG. 2 is a front view of FIG. 1;

FIG. 3 is a top view of FIG. 1;

FIG. 4 is a view taken along line A-A of FIG. 3;

FIG. 5 is a schematic connection diagram of an embodiment of a gas engine backfire simulation test apparatus of the present invention;

FIG. 6 is a flow chart of the operation of the gas engine backfire simulation test method of the present invention.

In the figure: 1. the device comprises a combustion chamber cylinder body, a safety chamber cylinder body, a controller, a base, an air pressurization system, a gas supply system, an oxygen input system, a throttle valve to be tested, a combustion chamber, a compressed air pipe seat, a gas pipe seat, an oxygen pipe seat and a gas mixing inclined plane, wherein the combustion chamber cylinder body is 2, the safety chamber cylinder body is 3, the controller is 4, the base is 5, the air pressurization system is 6, the gas supply system is 7, the oxygen input system is; 15. the device comprises a first cylinder pressure sensor, a first combustion analyzer, a second cylinder pressure sensor, an ignition device, a safety relief valve, a safety chamber, a valve 21, an exhaust valve, a digital display pressure gauge 22, a digital display pressure gauge 23, a second cylinder pressure sensor 24, a second combustion analyzer 25, a full-closing valve 31, a test control switch 32, a continuous test switch 33, an indicator light module 61, a gas nozzle 71, an oxygen nozzle 111, a first check valve 112, a first electromagnetic valve 121, a second check valve 122, a second electromagnetic valve 131, a third check valve 132 and a third electromagnetic valve.

Detailed Description

In order to make the technical solutions in the embodiments of the present invention better understood and make the above objects, features and advantages of the embodiments of the present invention more comprehensible, the technical solutions in the embodiments of the present invention are described in further detail below with reference to the accompanying drawings.

In the description of the present invention, unless otherwise specified and limited, it is to be noted that the term "connected" is to be interpreted broadly, and may be, for example, a mechanical connection or an electrical connection, or a communication between two elements, or may be a direct connection or an indirect connection through an intermediate medium, and a specific meaning of the term may be understood by those skilled in the art according to specific situations.

As shown in fig. 1, fig. 2, fig. 3 and fig. 4, an embodiment of the gas engine backfire simulation test device of the present invention includes a combustion chamber cylinder 1, a safety chamber cylinder 2 and a controller 3, wherein the combustion chamber cylinder 1 and the safety chamber cylinder 2 are both cylindrical, a cylindrical combustion chamber 10 is arranged in the combustion chamber cylinder 1, and a base 4 is fixedly arranged at a lower end of the combustion chamber cylinder 1; a compressed air pipe seat 11, a gas pipe seat 12, an oxygen pipe seat 13, a first cylinder pressure sensor 15, an ignition device 17 and a safety pressure relief valve 18 are inserted into the combustion chamber cylinder body 1, an opening is formed in one end of the combustion chamber cylinder body 1, and the opening end of the combustion chamber cylinder body 1 is used for being connected with a first end of a throttle valve 8 to be tested; a gas mixing inclined plane 14 is arranged in the combustion chamber 10, and the included angle between the gas mixing inclined plane 14 and the horizontal plane is preferably 30-45 degrees; the insertion end ports of the compressed air pipe seat 11, the gas pipe seat 12 and the oxygen pipe seat 13 face the gas mixing inclined plane 14, and the projection of the central line of the compressed air pipe seat 11 is positioned on the central line of the combustion chamber cylinder body 1. By arranging the inclined plane in the combustion chamber 10 and reasonably arranging the installation positions of the compressed air pipe seat 11, the gas pipe seat 12 and the oxygen pipe seat 13, air, gas and oxygen can be fully mixed in the combustion chamber 10, and the phenomenon of blasting caused by nonuniform gas mixing is avoided, so that the requirement of continuous testing is met; the safety relief valve 18 is arranged, so that pressure can be automatically relieved when the pressure of the combustion chamber 10 is too high, and explosion caused by too high pressure of the combustion chamber 10 is avoided.

The compressed air pipe seat 11 is connected with a first one-way valve 111, the first one-way valve 111 is connected with a first electromagnetic valve 112, and the first electromagnetic valve 112 is connected with the air pressurization system 5; the gas pipe base 12 is connected with a second one-way valve 121, the second one-way valve 121 is connected with a second electromagnetic valve 122, and the second electromagnetic valve 122 is connected with a gas nozzle 61 of the gas supply system 6; the oxygen pipe seat 13 and the gas pipe seat 12 are symmetrically arranged; the oxygen pipe seat 13 is connected with a third one-way valve 131, the third one-way valve 131 is connected with a third electromagnetic valve 132, and the third electromagnetic valve 132 is connected with the oxygen nozzle 71 of the oxygen input system 7; the first cylinder pressure sensor 15 is connected to a first combustion analyzer 16. The three check valves are arranged, so that the situation that the gas supply system 6 or the oxygen input system 7 is damaged due to backfire caused by incomplete closing of the electromagnetic valve when the ignition device 17 ignites can be avoided, the electromagnetic valve can be protected in the normal test process, and the service life of the electromagnetic valve is prolonged.

The safety chamber is characterized in that a cylindrical safety chamber 20 is arranged in the safety chamber cylinder body 2, an exhaust valve 21, a digital display pressure gauge 22 and a second cylinder pressure sensor 23 are inserted into the safety chamber cylinder body 2, the second cylinder pressure sensor 23 is connected with a second combustion analyzer 24, an opening is formed in one end of the safety chamber cylinder body 2, the opening end of the safety chamber cylinder body 2 is connected with a full-closing valve 25, and the full-closing valve 25 is used for connecting a second end of the throttle valve 8 to be detected. The digital display pressure gauge 22 is arranged, so that the air pressure can be observed in real time in the test process, and the defect that the combustion analyzer can check data only by connecting an oscilloscope and cannot observe in real time is overcome; a full-closed valve 25 is arranged to keep the pressure in the combustion chamber 10 and the internal space of the throttle valve 8 to be tested stable, and the fluctuation range of the pressure can be controlled within +/-0.05 MPa; the exhaust valve 21 can be protected, the defect that the exhaust valve 21 is easy to damage due to air pressure stamping is overcome, the throttle valve 8 to be tested is free from the limitation that the throttle valve 8 can only be tested in a completely closed state, the capability of resisting tempering impact of the throttle valve 8 to be tested in an open state or an incompletely closed state can be tested, and the working state simulation of the throttle valve 8 to be tested is more comprehensive.

As shown in fig. 5, the first solenoid valve 112, the second solenoid valve 122, the third solenoid valve 132, the ignition device 17, the exhaust valve 21, and the fully-closed valve 25 are all electrically connected to the controller 3; the controller 3 is electrically connected with a test control switch 31 and a continuous test switch 32, the test control switch 31 is used for enabling the controller 3 to control the test device to start testing, and the continuous test switch 32 is used for enabling the controller 3 to control the test device to perform cyclic testing; the controller 3 is also electrically connected with an indicator light module 33, the indicator light module 33 comprises a plurality of indicator lights, the test process of the test device is divided into a plurality of test steps, each indicator light corresponds to one test step, and in the test process, when the controller 3 sends an execution instruction of one test step, the corresponding indicator lights are simultaneously lightened. The controller 3 is also used for controlling the opening and closing of the throttle valve 8 to be tested, the gas nozzle 61 and the oxygen nozzle 71.

As shown in fig. 6, the working process of the embodiment of the backfire simulation test device of the gas engine of the invention comprises the following steps:

step S1, one end of the throttle valve 8 to be tested is fixedly connected to the opening end of the combustion chamber cylinder 1, the other end is connected to the fully-closed valve 25, the control ends of the throttle valve 8 to be tested, the gas nozzle 61 and the oxygen nozzle 71 are electrically connected to the controller 3, and the controller 3 sets the closing degree of the throttle valve 8 to be tested during testing, for example, the throttle valve 8 to be tested can be set to be completely closed during testing, or only half of the throttle valve 8 to be tested can be set to be closed during testing, and the following description will take the example of testing the state of half of the throttle valve 8 to be tested; a safety guard is provided around the test apparatus, and if the test is performed indoors, the exhaust valve 21 needs to be connected to an exhaust system.

And step S2, electrifying the test device, controlling the throttle valve 8 to be tested to be closed by half by the controller 3, detecting whether the test control switch 31 is closed, executing step S3 if the test control switch 31 is closed, and otherwise, returning to execute step S2.

In step S3, the controller 3 controls the conduction of the first solenoid valve 112, and the air-charging system 5 injects compressed air into the combustion chamber 10 to increase the air pressure in the combustion chamber 10 to a predetermined value, and then closes the first solenoid valve 112. Assuming that the predetermined value of the air pressure in the combustion chamber 10 is 2MPa, the air injection speed of the air supercharging system 5 may be adjusted to a suitable speed, for example, the air injection speed of the air supercharging system 5 may be adjusted to 20s to make the air pressure in the combustion chamber 10 reach 2MPa, and during the test, the conduction time of the first electromagnetic valve 112 may be set to 20s by the controller 3.

Step S3', wait 2S.

Step S4, the controller 3 controls the conduction of the second electromagnetic valve 122, and the fuel supply system 6 injects fuel gas into the combustion chamber 10 to make the ratio of fuel gas to compressed air reach a predetermined ratio, where the volume ratio of the injected fuel gas to the compressed air may be 4: 100 to 25: 100, the second solenoid valve 122 is then closed, and the amount of gas injected can be controlled by setting the on-time of the second solenoid valve 122 in the controller 3.

Step S4', wait 2S.

The existing pressurization system of a factory has the pressurization capacity of 0 to 5Bar, can meet the air pressure requirement of most tests, and if the higher target air pressure needs to be simulated, the existing pressurization system of the factory cannot meet the requirement, and after the step S4' is executed, the step S401 is executed firstly; otherwise, step S5 is directly performed.

In step S401, the controller 3 controls the third electromagnetic valve 132 to open, the oxygen input system 7 injects a predetermined amount of oxygen into the combustion chamber 10, then the third electromagnetic valve 132 is closed, and step S5 is executed after waiting for 2 seconds. The amount of the injected oxygen can be controlled by setting the on-time of the third solenoid valve 132 in the controller 3; by injecting oxygen into the combustion chamber 10, the pressure generated by combustion can be increased, thereby simulating higher combustion pressures without purchasing an air supercharging system 5 with high supercharging capacity, and saving cost.

Step S5, the controller 3 controls the ignition device to ignite for 5S, and the first combustion analyzer 16 and the second combustion analyzer 24 respectively collect the air pressure value of the combustion chamber 10 and the air pressure value of the security chamber 20 during the combustion process through the first cylinder pressure sensor 15 and the second cylinder pressure sensor 23.

Step S5', wait 5S.

In step S6, the controller 3 controls the throttle valve 8 to be tested to open, opens the exhaust valve 21 and the fully-closed valve 25 at the same time, and then controls the first electromagnetic valve 112 to open, so as to inject compressed air into the combustion chamber 10 and exhaust the exhaust gas in the combustion chamber 10.

Step S6', wait 20S.

In step S7, the controller 3 controls the first electromagnetic valve 112 to close, stops injecting the compressed air, closes the throttle valve 8 to be measured by half, and closes the exhaust valve 21 and the fully-closed valve 25.

And step S8, detecting whether the continuous test switch 32 is closed, if so, returning to execute the step S3, otherwise, executing the step S9.

Step S9, ending the test, respectively connecting the first combustion analyzer 16 and the second combustion analyzer 24 with an oscilloscope, checking cylinder pressure data of the combustion chamber 10 and the security chamber 20 through the oscilloscope, if the cylinder pressures of the combustion chamber 10 and the security chamber 20 are basically consistent, indicating that the fuel gas and the air are uniformly mixed, ensuring reliable test results, and judging the quality of the throttle valve 8 to be tested according to the measurement results; if the cylinder pressure of the security chamber 20 is greater than that of the combustion chamber 10, it indicates that secondary explosion occurs in the security chamber 20, the gas and air are not uniformly mixed, and the test needs to be performed again.

Before the test, an important test step in the test process may be associated with one indicator light of the indicator light module 33, for example, the indicator light module 33 may be provided with 8 indicator lights, which correspond to the steps S2, S3, S4, S5, S6, S7, S8 and S9, respectively, and the controller 3 may further light the indicator light associated with the indicator light module 33 when issuing the execution instruction of the test step, so as to observe whether the test process is normal.

When oxygen is not added, the time for completing one test is not more than 70s, when oxygen is added, the time for completing one test is not more than 80s, more than 800 backfire impact tests can be performed every day in a continuous test mode, and the test efficiency is high.

The undescribed parts of the present invention are consistent with the prior art, and are not described herein.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent structures made by using the contents of the present specification and the drawings can be directly or indirectly applied to other related technical fields, and are within the scope of the present invention.

Claims

1. A gas engine backfire simulation test device is characterized by comprising a combustion chamber cylinder body, a security chamber cylinder body and a controller, wherein a combustion chamber is arranged in the combustion chamber cylinder body, a compressed air pipe seat, a gas pipe seat, a first cylinder pressure sensor, an ignition device and a safety pressure release valve are inserted in the combustion chamber cylinder body, one end of the combustion chamber cylinder body is provided with an opening, and the opening end of the combustion chamber cylinder body is used for being connected with a first end of a throttle valve to be tested; the combustion chamber is internally provided with a gas mixing inclined plane, the insertion end ports of the compressed air pipe seat and the gas pipe seat face the gas mixing inclined plane, the compressed air pipe seat is connected with a first electromagnetic valve, and the first electromagnetic valve is connected with an air pressurization system; the gas pipe seat is connected with a second electromagnetic valve, and the second electromagnetic valve is connected with a gas supply system; the first cylinder pressure sensor is connected with a first combustion analyzer;

2. The gas engine backfire simulation test device of claim 1, further comprising a first check valve and a second check valve, said compressed air tube seat being connected to a first solenoid valve through the first check valve, said gas tube seat being connected to a second solenoid valve through the second check valve.

3. The gas engine backfire simulation test device of claim 1, wherein an oxygen pipe seat is further inserted on the combustion chamber cylinder body, and the oxygen pipe seat and the gas pipe seat are symmetrically arranged; the oxygen tube seat is connected with a third one-way valve, the third one-way valve is connected with a third electromagnetic valve, the third electromagnetic valve is connected with an oxygen input system, and the third electromagnetic valve is also electrically connected with the controller.

4. The gas engine backfire simulation test device of claim 1, wherein the combustion chamber cylinder body and the safety chamber cylinder body are both cylindrical, the combustion chamber and the safety chamber are both cylindrical, and a base is fixedly arranged at the lower end of the combustion chamber cylinder body.

5. The gas engine backfire simulation test device of claim 1, wherein a digital display pressure gauge is inserted on the cylinder body of the security chamber.

6. The gas engine flashback simulation test device of claim 1, wherein the controller is electrically connected to a test control switch and a continuous test switch.

7. The gas engine flashback simulation test device of claim 1, wherein the controller is electrically connected with an indicator light module, the indicator light module comprising a plurality of indicator lights.

8. A gas engine backfire simulation test method using the gas engine backfire simulation test apparatus as claimed in any one of claims 1 to 7, characterized by comprising the steps of:

9. The gas engine backfire simulation test method according to claim 8, wherein when the air pressure value generated by the air supercharging system is smaller than the air pressure value required for generating the target air pressure, after step S4 is executed, the following steps are further executed:

10. The gas engine flashback simulation test method of claim 8, wherein the amount of compressed air and fuel gas injected into the combustion chamber is controlled by setting the time at which the controller injects compressed air and fuel gas into the combustion chamber.