A pressure compensation type engine throttle backfire simulation generating device and method

Abstract

The present invention discloses a pressure-compensated engine throttle backfire simulation generating device and method, comprising a backfire simulation combustion tube, wherein the middle and lower parts of the backfire simulation combustion tube are vertically connected with a compensating telescopic cylinder; the upper part of the backfire simulation combustion tube is connected with an electronic throttle sample, and an igniter and a first air pressure sensor are distributed inside the backfire simulation combustion tube; the left end of the backfire simulation combustion tube is connected with a constant pressure mixed gas supply component. The use of the device and method can achieve the advantages of setting the pressure peak value, accurate detection results, good test repeatability and strong reliability.

Description

Technical Field

[0001] The invention relates to the technical field of power machinery testing, and in particular to a pressure compensation type engine throttle backfire simulation generating device and method. Background Art

[0002] Backfire, that is, the unexpected explosion of premixed combustible gas in the intake pipe before entering the combustion chamber of the engine, is a common failure phenomenon of single-point injection natural gas engines. When a backfire failure occurs, an instantaneous pressure shock will be generated in the intake pipe, and damage will be caused to the sensors, actuators and other components in the pipeline. Similar shock simulation devices on the market currently create instantaneous pressure shocks by igniting flammable and explosive gases such as propane in a simple test explosion tube. The pressure peak is uncontrollable and the test data is inaccurate.

[0003] The disclosure of the above background technology content is only used to assist in understanding the concept and technical solution of the present invention. It does not necessarily belong to the prior art of this patent application. In the absence of clear evidence that the above content has been disclosed on the filing date of this patent application, the above background technology should not be used to evaluate the novelty and creativity of the present application. Summary of the invention

[0004] In view of the above technical problems, the present invention provides a pressure compensation type engine throttle backfire simulation generating device and method with more accurate simulation and good use effect.

[0005] To achieve the above object, the present invention adopts the following technical solution:

[0006] A pressure-compensated engine throttle backfire simulation generating device comprises a backfire simulation combustion tube, the middle and lower parts of which are vertically connected to a compensating telescopic cylinder; the upper part of the backfire simulation combustion tube is connected to an electronic throttle sample, an igniter and a first air pressure sensor are distributed inside the backfire simulation combustion tube; the left end of the backfire simulation combustion tube is connected to a constant-pressure mixed gas supply assembly.

[0007] Furthermore, a lead center axis is distributed in the compensating telescopic cylinder, and a compensating piston is movably distributed on the lead center axis; a second air pressure sensor is provided at the lower portion of the compensating telescopic cylinder, and is also connected to a high-pressure air inlet pipe and an air outlet pipe; an electrically controlled valve is distributed on the air outlet pipe; the high-pressure air inlet pipe is connected to a first air storage chamber and a second air storage chamber through an air intake branch pipe, and an electrically controlled valve is distributed on each of the air intake branches; both the first air storage chamber and the second air storage chamber are connected to an air compressor, and an electrically controlled valve is further provided between the first air storage chamber and the second air storage chamber; a third air pressure sensor and a fourth air pressure sensor are further respectively distributed in the first air storage chamber and the second air storage chamber.

[0008] Furthermore, the right end of the tempering simulation combustion tube is also connected to a safety exhaust valve.

[0009] Furthermore, when the electronic throttle valve sample is in use, the opening degree is 3 to 5 degrees.

[0010] Furthermore, the constant-pressure mixed gas supply assembly includes an electronically driven mixing cylinder, in which a fifth air pressure sensor, an electronically driven piston, and a safety valve are distributed; the exhaust port of the electronically driven mixing cylinder is connected to the left end of the backfire simulation combustion tube through a connecting pipe, and the connecting pipe is provided with an electrically controlled valve and a one-way air valve; it also includes a combustible gas electronic filling cylinder and an air electronic filling cylinder, and the air inlet and outlet of the combustible gas electronic filling cylinder and the air electronic filling cylinder are respectively provided with electrically controlled valves and one-way air valves, and their air outlets are respectively connected to the right end of the electronically driven mixing cylinder.

[0011] The test method using the pressure-compensated engine throttle backfire simulation device as described above comprises the following steps:

[0012] (1) Determine the peak value M of the impact test pressure required after the backfire simulation combustion tube burns according to the engine model and needs, and then adjust and determine the corresponding pressure values ​​of the first pressure sensor, the third pressure sensor, the fourth pressure sensor, and the fifth pressure sensor;

[0013] (2) The combustible gas electronic filling cylinder and the air electronic filling cylinder are used to fill the electronically driven mixing cylinder according to the required ratio until the gas pressure in the electronically driven mixing cylinder reaches the set value A; the compressor inflates the first gas storage chamber and the second gas storage chamber respectively, and controls the closing of the electric control valve between the compressor and the compressor respectively according to the set pressure values ​​of the third gas pressure sensor and the fourth gas pressure sensor; and the optimal gas pressure value A1 of the first gas storage chamber needs to be determined through multiple tests, and the gas pressure value of the second gas storage chamber is M;

[0014] (3) The electrically controlled valve on the air intake branch pipe between the first air storage chamber and the compensating telescopic cylinder is opened, and the compensating piston is pushed upward;

[0015] (4) The electric control valve on the connecting pipe is opened, the electronically driven mixing cylinder introduces the mixed gas into the backfire simulation combustion tube, and the compensation piston is pushed down. At this time, the motor of the electronically driven mixing cylinder drives its piston to advance to maintain the upper air pressure value of the electronically driven mixing cylinder, the backfire simulation combustion tube and the compensation telescopic cylinder stable to A;

[0016] (5) The electronically controlled valve on the connecting pipe is closed, and then the igniter is ignited, and the mixed gas burns in the backfire simulation combustion tube; at the same time, the electronically controlled valve on the intake branch pipe between the first gas storage chamber and the compensating telescopic cylinder is closed, and the electronically controlled valve on the intake branch pipe between the second gas storage chamber and the compensating telescopic cylinder is opened; at this time, the compensating piston is continuously pushed upward at a steady pressure, and the exhaust gas impacts the electronic throttle valve sample, and the exhaust gas is completely discharged from its opening;

[0017] (6) Then, the electrically controlled valve on the air outlet pipe of the compensating telescopic cylinder is opened, and is closed when the air pressure value at the lower part of the compensating telescopic cylinder drops below A1; then, the electrically controlled valve on the air intake branch pipe between the first air storage chamber and the compensating telescopic cylinder is opened to maintain the air pressure value at A1; a test cycle is completed, and finally, after the required number of test cycles are completed, the deformation amounts of the relevant components of the electronic throttle valve sample are measured to obtain the required data.

[0018] Furthermore, the determination of the optimal air pressure value A1 requires that the air pressure values ​​in the first air storage chamber be tested and selected in order from a high value not higher than M to a low value before conducting the test experiment, so as to select the optimal air pressure value A1 by checking whether the highest value generated in the backfire simulation combustion tube after the ignition combustion test is stable at the impact test air pressure peak value M.

[0019] The beneficial effects of the present invention compared with the prior art are as follows:

[0020] (1) The air pressure setting value of the fifth air pressure sensor of the present invention is lower than the mixed gas pressure value used in the traditional device, because the electronic throttle valve samples are opened by 3-5% during the test process, which can reduce the loss of mixed combustion gas and at the same time improve the relative stability of the air pressure value in the backfire simulation combustion tube before ignition, thereby improving the controllability and repeatability of the combustion energy.

[0021] (2) By adding a compensating telescopic cylinder, the mixture pressure is reduced and the volume of the mixture entering is increased. At the same time, the compensating piston is movable. The purpose is to improve the dynamic stability of the air pressure of the test system, so as to improve the controllability of the air pressure in repeated tests and ensure the accuracy of the test. After the mixture is burned, it is further compressed to maintain / increase to and obtain the required maximum pressure value, thereby improving the accuracy of the test value.

[0022] (3) The gas pressure generated by the heat released by the combustion of the mixed gas is actually greatly affected by the air-fuel ratio. The maximum combustion gas pressure obtained by repeated tests of traditional devices is uneven each time, and it is impossible to effectively control the gas pressure, let alone achieve the accuracy of the test. The present invention is provided with a combustible gas electronic filling cylinder and an air electronic filling cylinder to achieve controllable proportion mixing, and then the electronically driven mixing cylinder is provided to ensure the relative stability of the mixed gas pressure, improve the repeatability of the test effect, and achieve precise control. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the present invention. DETAILED DESCRIPTION

[0024] A pressure-compensated engine throttle backfire simulation device includes a backfire simulation combustion tube 16, the middle and lower parts of which are vertically connected to a compensating telescopic cylinder 24; the upper part of the backfire simulation combustion tube 16 is connected to an electronic throttle sample 12, inside which are distributed an igniter 26, a first air pressure sensor 14 and a temperature sensor 13; the left end of the backfire simulation combustion tube 16 is connected to a constant-pressure mixed gas supply assembly. The right end of the backfire simulation combustion tube 16 is also connected to a safety exhaust valve 15, which is used to open a protective device to prevent explosion when the air pressure is too high or the equipment fails. During the test, the opening of the electronic throttle sample 12 is 3 to 5 degrees, and its outside is connected to the atmosphere.

[0025] The compensating telescopic cylinder 24 is provided with a lead center axis 17, and a compensating piston 20 is movably provided on the lead center axis 17. Of course, a sealing rubber ring 23 is provided at the center of the compensating telescopic cylinder 24; a second air pressure sensor 19 is provided at the lower part of the compensating telescopic cylinder 24, and a high-pressure air inlet pipe 22 and an air outlet pipe 21 are also connected; an electric control valve 25 is distributed on the air outlet pipe 21. The air outlet pipe 21 of this embodiment can be set as a small tube to facilitate slow deflation operation; the high-pressure air inlet pipe is connected to the air outlet pipe 21 through two inlet pipes. The air branch pipe is connected to the first air storage chamber 18 and the second air storage chamber 28, and the air intake branch pipe is provided with an electrically controlled valve; the first air storage chamber 18 and the second air storage chamber 28 are both connected to the compressor 27, and an electrically controlled valve is provided between the first air storage chamber 18 and the second air storage chamber 28; the first air storage chamber and the second air storage chamber are provided with a third air pressure sensor and a fourth air pressure sensor, and when in use, when the air pressure in the air storage chamber reaches the set value, the electrically controlled valve is closed, and when the air pressure value is lower than the set value, the electrically controlled valve is opened to continue replenishing air.

[0026] The constant pressure mixed gas supply assembly includes an electronically driven mixing cylinder 1, a combustible gas electronic filling cylinder 5 and an air electronic filling cylinder 10, and in order to improve accuracy, a servo electric cylinder is preferably used. The electronically driven mixing cylinder is provided with a fifth air pressure sensor 7, an electronically driven piston 2, and a safety valve 1-1; the exhaust port of the electronically driven mixing cylinder is connected to the left end of the backfire simulation combustion tube 16 through a connecting pipe, and the connecting pipe is provided with an electric control valve 11 and a one-way air valve; the inlet and outlet of the combustible gas electronic filling cylinder and the air electronic filling cylinder are respectively provided with electric control valves 4, 6, 8, 9 and a one-way air valve, and their outlets are respectively connected to the right end of the electronically driven mixing cylinder.

[0027] The test method using the pressure-compensated engine throttle backfire simulation device as described above comprises the following steps:

[0028] (1) Determine the impact test pressure peak value M required after the backfire simulation combustion tube 16 burns according to the engine model and needs, and then adjust and determine the corresponding pressure values ​​of the first pressure sensor, the third pressure sensor, the fourth pressure sensor and the fifth pressure sensor;

[0029] (2) according to the required proportion, the combustible gas electronic filling cylinder and the air electronic filling cylinder are used to fill the inner cavity 3 of the electronically driven mixing cylinder until the gas pressure in the electronically driven mixing cylinder reaches the set value A (when the mixed gas with the gas pressure value A burns in the backfire simulation combustion tube 16 under the environment of this system, the maximum gas pressure after combustion is lower than the impact test gas pressure peak M, but the impact test gas pressure peak reaches M only after the compensating piston is pushed up and pressurized. This strategy significantly improves the pressure of each repeated test to be close to the impact test gas pressure peak M. And eliminates the problem that the final impact test gas pressure peak is large in difference and inaccurate evaluation due to factors such as rapid loss of the mixed gas under traditional high-pressure mixed gas and different combustion sufficiency in each repeated test); the compressor inflates the first gas storage cavity and the second gas storage cavity respectively, and controls the closing of the electric control valve between the compressor and the compressor respectively according to the set pressure values ​​of the third gas pressure sensor and the fourth gas pressure sensor; and the optimal gas pressure value A1 of the first gas storage cavity needs to be determined through multiple tests, and the gas pressure value of the second gas storage cavity is M;

[0030] (3) The electrically controlled valve on the air intake branch pipe between the first air storage chamber and the compensating telescopic cylinder 24 is opened, and the compensating piston is pushed upward;

[0031] (4) The electric control valve on the connecting pipe is opened, the electronically driven mixing cylinder passes the mixed gas into the backfire simulation combustion tube 16, the compensation piston is pushed down, and the mixed gas enters the upper inner cavity 24-1 of the compensation piston. At this time, the motor of the electronically driven mixing cylinder drives its piston to advance to maintain the upper air pressure value of the electronically driven mixing cylinder, the backfire simulation combustion tube 16 and the compensation telescopic cylinder 24 stable to A;

[0032] (5) The electric control valve on the connecting pipe is closed, and then the igniter is ignited, and the mixed gas is burned in the backfire simulation combustion tube 16; at the same time, the electric control valve on the intake branch pipe between the first gas storage chamber and the compensating telescopic cylinder 24 is closed, and the electric control valve on the intake branch pipe between the second gas storage chamber and the compensating telescopic cylinder 24 is opened; at this time, the compensating piston is continuously pushed upward at a stable pressure, and the exhaust gas impacts the electronic throttle valve sample 12, and the exhaust gas is completely discharged from its opening;

[0033] (6) Then, the electrically controlled valve on the air outlet pipe of the compensating telescopic cylinder 24 is opened, and is closed when the air pressure value at the bottom of the compensating telescopic cylinder 24 drops below A1; then, the electrically controlled valve on the air intake branch pipe between the first air storage chamber and the compensating telescopic cylinder 24 is opened to maintain the air pressure value at A1; a test cycle is completed, and finally, after the required number of test cycles are completed, the deformation amount of the relevant components of the electronic throttle sample 12 is measured to obtain the required data.

[0034] Furthermore, the determination of the optimal air pressure value A1 requires a preliminary screening test before conducting the test experiment, that is, the air pressure values ​​in the first air storage chamber are tested and selected in order from a high value not higher than M to a low value, so as to determine whether the highest value generated in the backfire simulation combustion tube 16 after the ignition combustion test is stable at the impact test air pressure peak value M to select the optimal air pressure value A1. After selection, subsequent test experiments (repeated tests) will uniformly use the A1 value.

Claims

1. A pressure-compensated engine throttle backfire simulation device, characterized in that: It includes a tempering simulation combustion tube, the middle and lower parts of which are vertically connected with a compensating telescopic cylinder; the upper part of the tempering simulation combustion tube is connected with an electronic throttle valve sample, and an igniter and a first air pressure sensor are distributed inside the tube; the left end of the tempering simulation combustion tube is connected with a constant pressure mixed gas supply component; A lead center axis is distributed in the compensating telescopic cylinder, and a compensating piston is movably distributed on the lead center axis; a second air pressure sensor is provided at the lower part of the compensating telescopic cylinder, and is also connected with a high-pressure air inlet pipe and an air outlet pipe; the high-pressure air inlet pipe is connected with a first air storage chamber and a second air storage chamber through an air inlet branch pipe, and an electric control valve is distributed on each of the air inlet branches; the first air storage chamber and the second air storage chamber are both connected with an air compressor, and an electric control valve is also provided between the first air storage chamber and the second air storage chamber; a third air pressure sensor and a fourth air pressure sensor are also distributed in each of the first air storage chamber and the second air storage chamber; The constant-pressure mixed gas supply component includes an electronically driven mixing cylinder, in which a fifth air pressure sensor and an electronically driven piston are distributed; the exhaust port of the electronically driven mixing cylinder is connected to the left end of the backfire simulation combustion tube through a connecting pipe, and the connecting pipe is provided with an electrically controlled valve and a one-way air valve; it also includes a combustible gas electronic filling cylinder and an air electronic filling cylinder, and the air inlet and outlet of the combustible gas electronic filling cylinder and the air electronic filling cylinder are respectively provided with an electrically controlled valve and a one-way air valve, and their air outlets are respectively connected to the right end of the electronically driven mixing cylinder.

2. A pressure-compensated engine throttle backfire simulation device according to claim 1, characterized in that: The air outlet pipe is provided with an electric control valve.

3. A pressure-compensated engine throttle backfire simulation device according to claim 1, characterized in that: The right end of the tempering simulation combustion tube is also connected with a safety exhaust valve.

4. A pressure-compensated engine throttle backfire simulation device according to claim 1, characterized in that: When the electronic throttle valve sample is in use, the opening degree is 3 to 5 degrees.

5. A pressure-compensated engine throttle backfire simulation device according to claim 1, characterized in that: A safety valve is also provided in the electronically driven mixing cylinder.

6. A test method using a pressure-compensated engine throttle backfire simulation device as claimed in any one of claims 1 to 5, characterized in that: The steps include: (1) Determine the peak value M of the impact test pressure required after the backfire simulation combustion tube burns according to the engine model and needs, and then adjust and determine the corresponding pressure values ​​of the first pressure sensor, the third pressure sensor, the fourth pressure sensor, and the fifth pressure sensor; (2) The combustible gas electronic filling cylinder and the air electronic filling cylinder are used to fill the electronically driven mixing cylinder according to the required ratio until the gas pressure in the electronically driven mixing cylinder reaches the set value A; the compressor inflates the first gas storage chamber and the second gas storage chamber respectively, and controls the closing of the electric control valve between the compressor and the compressor respectively according to the set pressure values ​​of the third gas pressure sensor and the fourth gas pressure sensor; and the optimal gas pressure value A1 of the first gas storage chamber needs to be determined through multiple tests, and the gas pressure value of the second gas storage chamber is M; (3) The electrically controlled valve on the air intake branch pipe between the first air storage chamber and the compensating telescopic cylinder is opened, and the compensating piston is pushed upward; (4) The electric control valve on the connecting pipe is opened, the electronically driven mixing cylinder introduces the mixed gas into the backfire simulation combustion tube, and the compensation piston is pushed down. At this time, the motor of the electronically driven mixing cylinder drives its piston to advance to maintain the upper air pressure value of the electronically driven mixing cylinder, the backfire simulation combustion tube and the compensation telescopic cylinder stable to A; (5) The electronically controlled valve on the connecting pipe is closed, and then the igniter is ignited, and the mixed gas burns in the backfire simulation combustion tube; at the same time, the electronically controlled valve on the intake branch pipe between the first gas storage chamber and the compensating telescopic cylinder is closed, and the electronically controlled valve on the intake branch pipe between the second gas storage chamber and the compensating telescopic cylinder is opened; at this time, the compensating piston is continuously pushed upward at a steady pressure, and the exhaust gas impacts the electronic throttle valve sample, and the exhaust gas is completely discharged from its opening; (6) Then, the electrically controlled valve on the air outlet pipe of the compensating telescopic cylinder is opened, and is closed when the air pressure value at the lower part of the compensating telescopic cylinder drops below A1; then, the electrically controlled valve on the air intake branch pipe between the first air storage chamber and the compensating telescopic cylinder is opened to maintain the air pressure value at A1; a test cycle is completed, and finally, after the required number of test cycles are completed, the deformation amounts of the relevant components of the electronic throttle valve sample are measured to obtain the required data.

7. The testing method according to claim 6, characterized in that: The optimal air pressure value A1 is determined by testing and selecting the air pressure values ​​in the first air storage chamber in the order from a high value not higher than M to a low value before conducting the test experiment, so as to select the optimal air pressure value A1 by checking whether the highest value generated in the backfire simulation combustion tube after the ignition combustion test is stable at the impact test air pressure peak value M.

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