Exhaust manifold detection device and method of use thereof

Abstract

The present application relates to the technical field of detection device, and specifically discloses an exhaust manifold detection device and a use method thereof, the exhaust manifold detection device comprising an exhaust manifold assembly, a combustion chamber and a cylinder head assembly, the combustion chamber is formed with a combustion space, the combustible mixture can enter the combustion space and burn in the combustion space, the cylinder head assembly comprises a plurality of flexible cylinder heads, the plurality of flexible cylinder heads correspond to the plurality of manifolds one by one, a valve train assembly is fixedly arranged on the flexible cylinder head, the valve train assembly is used for opening or closing the exhaust passage, and the combustion exhaust can enter the manifold through the flexible cylinder head. The valve train assembly opens the exhaust passage, the combustion exhaust enters the manifold through the exhaust passage, the exhaust passage is simultaneously opened or opened in a specific order through the valve train assembly, which provides a working environment closer to the engine for performance detection of the exhaust manifold, and improves the accuracy of the test.

Description

Technical Field

[0001] This invention relates to the field of detection device technology, and in particular to an exhaust manifold detection device and its usage method. Background Technology

[0002] As a core component of the engine exhaust system, the exhaust manifold directly affects the engine's power performance and fuel economy. Key indicators for evaluating exhaust manifold performance include pressure loss and the prevention of mutual interference between different manifolds. Excessive exhaust resistance leads to increased fuel consumption, deteriorating engine economy, and simultaneously reducing engine power. Incomplete combustion in the cylinders further exacerbates the problem. Poor consistency in exhaust flow and pressure across manifolds causes exhaust interference. Excessive interference can cause the exhaust pressure wave from one cylinder to affect the next. When the exhaust valve of the next cylinder opens, the pressure wave from the previous cylinder arrives at the back of the exhaust valve, resulting in poor exhaust flow in the next cylinder. This mutual interference between cylinders can lead to backflow of exhaust gases.

[0003] Currently, the main methods for testing the performance of exhaust manifolds include simulation and testing. Simulation methods, due to the cumulative error from added constraints, often result in discrepancies between simulation results and actual conditions. Testing methods involve simultaneously or individually introducing gas into each manifold to measure airflow and pressure. This allows for the assessment of exhaust interference between manifolds and the exhaust resistance of individual manifolds. However, this method uses compressed air, which has a significant difference in composition, leading to variations in flow patterns within the exhaust manifold. Therefore, existing testing equipment cannot fully simulate the real working environment of the exhaust manifold, and thus cannot accurately reproduce the flow rate, pressure, temperature, and exhaust resistance of each manifold after combustion exhaust gas enters. Only a rough assessment is possible. Furthermore, due to limitations in vehicle development cycles and models, not all exhaust manifolds of different specifications can be installed in engines for actual testing. Therefore, due to the inadequacies of testing methods, there is still considerable room for optimization during the development of exhaust manifolds. Summary of the Invention

[0004] The purpose of this invention is to provide an exhaust manifold testing device and its testing method to solve the problem that existing testing equipment cannot fully simulate the real working environment of the exhaust manifold, resulting in insufficient testing accuracy.

[0005] The exhaust manifold detection device provided by the application comprises an exhaust manifold assembly, a combustion chamber and a cylinder head assembly, the exhaust manifold assembly comprises an exhaust manifold and a plurality of manifolds in communication with the exhaust manifold, the combustion chamber is formed with a combustion space, combustible mixture can enter the combustion space and burn in the combustion space, and combustion exhaust is formed after combustion, the cylinder head assembly comprises a plurality of flexible cylinder heads, the number of the flexible cylinder heads is consistent with the number of the manifolds, the plurality of flexible cylinder heads correspond to the plurality of manifolds one by one, a valve train assembly is fixedly arranged on the flexible cylinder head, the flexible cylinder head is formed with an exhaust passage, the exhaust passage is in communication with the combustion space, the valve train assembly is used for opening or closing the exhaust passage, and the combustion exhaust can enter the manifold through the flexible cylinder head.

[0006] As a preferred technical scheme of the exhaust manifold detection device, the valve train assembly comprises an exhaust valve, a camshaft and a cam, the cam is fixedly sleeved on the camshaft, the camshaft is rotationally connected with the flexible cylinder head, the exhaust valve can open or close the exhaust passage, and the cam is used for driving the exhaust valve to open the exhaust passage.

[0007] As a preferred technical scheme of the exhaust manifold detection device, the valve train assembly further comprises a spline, the spline is arranged at two ends of the camshaft, and adjacent two camshafts are fixedly connected through the spline.

[0008] As a preferred technical scheme of the exhaust manifold detection device, the cylinder head assembly further comprises a driving motor, an output shaft of the driving motor is fixedly connected with the camshaft, and the driving motor is used for driving the camshaft to rotate.

[0009] As a preferred technical scheme of the exhaust manifold detection device, the cylinder head assembly further comprises a plurality of flow adjusting assemblies, the number of the flow adjusting assemblies is consistent with the number of the flexible cylinder heads, the plurality of flow adjusting assemblies correspond to the plurality of flexible cylinder heads one by one, the flow adjusting assembly is arranged between the combustion chamber and the flexible cylinder head, and the flow adjusting assembly is used for changing the amount of the combustion exhaust entering the exhaust passage.

[0010] As a preferred technical scheme of the exhaust manifold detection device, the device further comprises a temperature control assembly, the temperature control assembly is arranged between the combustion chamber and the cylinder head assembly, and the temperature control assembly is used for measuring and changing the temperature of the combustion exhaust entering the exhaust passage.

[0011] As a preferred technical scheme of the exhaust manifold detection device, the temperature control assembly comprises a temperature measuring pipe, a heating pipe and a cooling pipe, the temperature measuring pipe is in communication with the combustion chamber and the cylinder head assembly respectively, the heating pipe and the cooling pipe are communicated with the temperature measuring pipe respectively, the temperature measuring pipe is used for measuring the temperature of the combustion exhaust, the heating pipe is used for heating the combustion exhaust, and the cooling pipe is used for cooling the combustion exhaust.

[0012] As the preferred technical scheme of the exhaust manifold detection device, the gas mixing assembly further comprises an air pump and a mixing chamber, the mixing chamber is in communication with the air pump and the combustion chamber respectively, the air pump is used for supplying compressed air into the mixing chamber, the mixing chamber is provided with an oil injector, the oil injector is used for spraying fuel into the mixing chamber, the fuel and the compressed air form combustible mixture in the mixing chamber and enter the combustion chamber.

[0013] As the preferred technical scheme of the exhaust manifold detection device, the manifold is further provided with a collection assembly, the collection assembly is used for collecting the flow, pressure and temperature of the combustion exhaust gas in the manifold.

[0014] The application provides a use method of the exhaust manifold detection device, which is applied to the exhaust manifold detection device in any of the above schemes, and the use method comprises the following steps of:

[0015] Igniting the combustible mixture in the combustion chamber;

[0016] Turning on the exhaust passage of at least one flexible cylinder head and closing the exhaust passages of the remaining flexible cylinder heads.

[0017] The application has the following beneficial effects:

[0018] The application provides an exhaust manifold detection device, which comprises an exhaust manifold assembly, a combustion chamber and a cylinder head assembly, the exhaust manifold assembly comprises an exhaust manifold and a plurality of manifolds in communication with the exhaust manifold, the combustion chamber is formed with a combustion space, combustible mixture can enter the combustion space and burn in the combustion space, and combustion exhaust gas is formed after combustion, the cylinder head assembly comprises a plurality of flexible cylinder heads, the number of the flexible cylinder heads is consistent with the number of the exhaust manifolds, the plurality of flexible cylinder heads correspond to the plurality of manifolds one by one, the flexible cylinder heads are fixedly provided with valve distribution assemblies, the flexible cylinder heads are formed with exhaust passages, the exhaust passages are in communication with the combustion space, the valve distribution assemblies are used for turning on or closing the exhaust passages, and the combustion exhaust gas can enter the manifolds through the flexible cylinder heads. The valve distribution assemblies turn on the exhaust passages, the combustion exhaust gas enters the manifolds through the exhaust passages, the valve distribution assemblies turn on the exhaust passages at the same time or in a specific order, a working environment closer to the engine is provided for performance detection of the exhaust manifold, and the accuracy of the test is improved. BRIEF DESCRIPTION OF DRAWINGS

[0019] Fig. 1 It is a plan view of the exhaust manifold detection device unfolded in the embodiment of the application.

[0020] Fig. 2 It is a plan view of the combustion chamber in the embodiment of the application.

[0021] Fig. 3 It is a plan view of the flexible cylinder head in the embodiment of the application.

[0022] In the drawings:

[0023] 1. Air filter; 2. Air pump; 3. Combustion chamber; 4. Temperature sensor tube; 5. Cooling tube; 6. Heating tube; 7. Air supply passage; 8. Flow regulator; 9. Drive motor; 10. Camshaft; 11. Flexible cylinder head; 12. Spline; 13. Flange; 14. Exhaust manifold assembly; 15. Data acquisition unit; 16. Mixing chamber; 17. Flow sensor; 18. Actuator; 19. Camshaft;

[0024] 301. Intake pipe; 302. Exhaust pipe; 303. Spark plug;

[0025] 1101. Intake manifold; 1102. Exhaust manifold; 1103. Exhaust valve. Detailed Implementation

[0026] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions. Furthermore, "above," "on top of," and "over" the first feature in relation to the second feature includes the first feature directly above and diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "under," and "below" the first feature in relation to the second feature includes the first feature directly below and diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0028] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0029] Embodiments of the present application are described below in detail with reference to the drawings, examples of which are shown in the drawings, wherein the same or similar notations are used to represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary only, and are used only for the purpose of explaining the present application, and are not to be understood as limiting the present application.

[0030] The exhaust manifold, as the core component of the engine exhaust system, directly affects the power performance and fuel economy of the engine. The main indicators for evaluating the performance of the exhaust manifold include the pressure loss of the exhaust manifold and the mutual interference between the exhaust manifolds. If the exhaust resistance is too large, the engine fuel consumption rate rises, the engine economic performance deteriorates, and at the same time, the engine power performance also deteriorates, and the exhaust emission quality also deteriorates due to the insufficient combustion in the cylinder. If the consistency of the flow and pressure of the exhaust of each manifold is poor, the exhaust interference occurs between the manifolds, and if the exhaust interference is too large, the exhaust pressure wave of a certain cylinder acts on the next cylinder, and when the exhaust valve of the next cylinder is opened, the pressure wave of the exhaust of the previous cylinder arrives at the back of the exhaust valve, causing the exhaust of the next cylinder to be not smooth, and mutual interference occurs between the cylinders, and the exhaust gas backflows.

[0031] At present, the performance detection methods of the exhaust manifold mainly include simulation method and test method. The simulation method has a certain deviation from the actual situation due to the cumulative error of the artificially added limiting conditions. The test method detects the flow and pressure of the gas simultaneously or separately into each manifold, thereby detecting the degree of exhaust interference between the manifolds and the exhaust resistance of the single manifold. However, the compressed air is introduced into the manifold in this method, and the composition of the exhaust gas is quite different, and the flow states of the two in the exhaust manifold are also different. Therefore, the existing test equipment cannot completely simulate the real working environment of the exhaust manifold, so it cannot accurately restore the flow, pressure, temperature and exhaust resistance of each manifold after the combustion exhaust gas enters the exhaust manifold, and can only be roughly evaluated. And due to the limitation of the development cycle and mode of the vehicle model, different specifications of the exhaust manifold cannot be all installed on the engine for on-engine measurement. Therefore, due to the deficiency of the detection method, there is still a large optimization space for the exhaust manifold in the development process.

[0032] To this end, the exhaust manifold detection device provided by the present embodiment can also detect the performance of the exhaust manifold, and can also solve the above problems.

[0033] As Figs. 1-3As shown, the exhaust manifold detection device provided by the present application comprises an exhaust manifold assembly 14, a combustion chamber 3 and a cylinder head assembly. The exhaust manifold assembly 14 comprises an exhaust manifold and a plurality of manifolds in communication with the exhaust manifold. The combustion chamber 3 is formed with a combustion space into which combustible mixture can enter and burn, and after combustion, combustion exhaust gas is formed. The cylinder head assembly comprises a plurality of flexible cylinder heads 11, the number of which is consistent with the number of manifolds. The plurality of flexible cylinder heads 11 correspond to the plurality of manifolds one by one. The flexible cylinder head 11 is fixedly provided with a valve train assembly. The flexible cylinder head 11 is formed with an exhaust passage in communication with the combustion space. The valve train assembly is used to open or close the exhaust passage. The combustion exhaust gas can enter the manifold through the flexible cylinder head 11. When the valve train assembly opens the exhaust passage, the combustion exhaust gas enters the manifold through the exhaust passage. By simultaneously opening the exhaust passage or opening the exhaust passage in a specific order through the valve train assembly, a working environment closer to the engine is provided for performance detection of the exhaust manifold assembly 14, and the accuracy of the test is improved.

[0034] Specifically, the valve train assembly comprises an exhaust valve 1103, a camshaft 19 and a cam 10. The cam 10 is fixedly sleeved on the camshaft 19, and the camshaft 19 is rotationally connected with the flexible cylinder head 11. The exhaust valve 1103 can open or close the exhaust passage of the flexible cylinder head 11. When the camshaft 19 drives the cam 10 to rotate, the cam 10 drives the exhaust valve 1103 to open the exhaust passage, and the combustion exhaust gas can enter the corresponding manifold through the exhaust passage. The exhaust valve 1103 can be a combination of a valve and a spring in the prior art. The flexible cylinder head 11 is provided with an exhaust hole, and the valve is used to block the exhaust hole. The spring is sleeved outside the valve rod. The valve is in a normally closed state. When the cam 10 rotates, the valve is pushed, the exhaust hole on the flexible cylinder head 11 is opened, and thus the exhaust passage is opened. With the continuous rotation of the cam 10, the valve is reset under the action of the spring and blocks the exhaust hole again, so that the exhaust passage is closed.

[0035] Optionally, the valve train assembly further comprises a spline 12 arranged at both ends of the camshaft 19, and adjacent two camshafts 19 are fixedly connected through the spline 12. In order to facilitate processing, manufacturing and assembly, in this embodiment, one end of the spline 12 is provided with an internal spline, and the other end of the spline 12 is provided with an external spline, and the internal spline is matched with the external spline. When detecting the exhaust manifold, the plurality of flexible cylinder heads 11 are fixedly connected through the matching of the internal spline and the external spline, so that the flexible cylinder heads 11 can be quickly disassembled and assembled to adapt to different specifications of the exhaust manifold. For example, when detecting the exhaust manifold of a straight six-cylinder engine, the internal spline and the external spline of the camshafts 19 of the six flexible cylinder heads 11 are matched to realize fixed connection, so as to meet the detection requirements. When switching to detect the exhaust manifold of a straight four-cylinder engine, the two flexible cylinder heads 11 at the edge are disassembled to realize quick switching.

[0036] Optionally, the cylinder head assembly further comprises a driving motor 9, the output shaft of the driving motor 9 is fixedly connected with the camshaft 19 of the edge flexible cylinder head 11, and the connection mode can be spline connection or connection through a shaft coupling. The driving motor 9 is used to drive the camshaft 19 to rotate. For the convenience of explanation and description, the exhaust manifold of a straight six-cylinder engine is taken as an example. Since the six camshafts 19 are fixedly connected through the splines 12, when the driving motor 9 drives the edge camshaft 19 to rotate, the six camshafts 19 rotate synchronously and drive the six cams 10 to rotate by the same angle. At this time, the angle of each cam 10 on the corresponding camshaft 19 can be set to realize the conduction and closing of the exhaust passages of the six flexible cylinder heads 11 in the corresponding exhaust order. The phase difference between the corresponding cams 10 can be determined by engineering practice. At the same time, the rotation speed of the driving motor 9 can be adjusted to simulate the operating speed of the engine. Thus, the same test scene as the operating condition of the engine is provided for the detection of the exhaust manifold. In the embodiment, the power of the driving motor 9 is preferably 300w, and the maximum rotation speed is 5000rpm, so as to meet the requirement of simulating the rotation speed of the engine.

[0037] Further, the cylinder head assembly further comprises a plurality of flow regulating assemblies, the number of the flow regulating assemblies is consistent with the number of the flexible cylinder heads 11, and the plurality of flow regulating assemblies correspond to the plurality of flexible cylinder heads 11 one by one. The flow regulating assembly is arranged between the combustion chamber 3 and the flexible cylinder head 11, and is used to change the amount of combustion exhaust gas entering the exhaust passage. The flow regulating assembly comprises a flow regulator 8, a flow sensor 17 and an actuator 18, the actuator 18 is connected with the flow regulator 8 and can change the flow of combustion exhaust gas through the flow regulator 8, and the flow sensor 17 collects the amount of combustion exhaust gas entering the exhaust passage. The flow sensor 17 and the actuator 18 are in communication connection with the controller, the flow sensor 17 collects the amount of combustion exhaust gas entering the exhaust passage, the controller adjusts the actuator 18 accordingly, so as to change the amount of combustion exhaust gas through the flow regulator 8, and realizes closed-loop control. The controller can be a centralized or distributed controller, for example, the controller can be a single microcontroller, or can be composed of distributed multiple microcontrollers, and a control program can be run in the microcontroller to control the components to realize their functions. The driving motor 9 in the embodiment is preferably a variable frequency speed motor, which is in communication connection with the controller. When different engine operating conditions need to be simulated, the variable frequency speed motor is controlled by the controller to adjust the rotation speed, and the actuator 18 is controlled to make the amount of combustion exhaust gas entering the exhaust passage match the corresponding working condition, so that the detection environment further approaches the actual operating condition of the engine.

[0038] Further, the exhaust manifold further comprises a temperature control assembly, which is arranged between the combustion chamber 3 and the cylinder head assembly. The temperature control assembly is in communication with the cylinder head assembly through a supply air passage 7, which comprises a main air passage and a plurality of branch air passages in communication with the main air passage. The main air passage is in communication with an output end of the temperature control assembly, and the number of branch air passages is arranged to be consistent with and one-to-one corresponding to the number of flexible end covers. In order to simplify the complexity of the structure, the temperature control assembly in the embodiment is preferably arranged upstream of the plurality of flow regulating assemblies. The temperature control assembly is used to measure and change the temperature of the combustion exhaust gas entering the exhaust passage, so that the detection environment is further close to the actual operating condition of the engine.

[0039] Specifically, the temperature control assembly comprises a temperature measuring pipe 4, a heating pipe 6 and a cooling pipe 5. The two ends of the temperature measuring pipe 4 are in communication with the combustion chamber 3 and the cylinder head assembly, respectively. The heating pipe 6 and the cooling pipe 5 are in communication with the temperature measuring pipe 4, respectively. The temperature measuring pipe 4 is used to measure the temperature of the combustion exhaust gas, the heating pipe 6 is used to heat the combustion exhaust gas, and the cooling pipe 5 is used to cool the combustion exhaust gas. The temperature of the exhaust gas discharged by the engine during operation is different under different operating conditions, therefore, the temperature control assembly is arranged to enable the temperature of the combustion exhaust gas entering the exhaust manifold to match the corresponding operating condition. In the embodiment, the temperature measuring pipe 4, the heating pipe 6 and the cooling pipe 5 are all in communication connection with the controller. When simulating different engine operating conditions, the controller obtains the temperature of the combustion exhaust gas through the temperature measuring pipe 4, and selectively causes the combustion exhaust gas to enter the heating pipe 6 for heating or enter the cooling pipe 5 for cooling, until the temperature of the combustion exhaust gas matches the operating condition. The heating mode of the heating pipe 6 in the embodiment is preferably to heat the combustion exhaust gas by electric heating. The cooling mode of the cooling pipe 5 is preferably to dissipate heat by water cooling, and the cooling pipe 5 can also be arranged as a water cooler, which adopts a fin structure for cooling, and the cooling water flow is 80L / min. The structure of the water cooler is not described here as prior art. The temperature control assembly in the embodiment further comprises a solenoid valve, which is in communication connection with the controller. The solenoid valve can selectively introduce the combustible exhaust gas into the heating pipe 6 or the cooling pipe 5, or directly into the cylinder head assembly. As prior art in the field, the specifications of the solenoid valve and the access mode of the solenoid valve in the temperature control assembly are not described here.

[0040] Further, the exhaust manifold detection device further comprises a gas mixing assembly. The gas mixing assembly comprises an air pump 2 and a mixing chamber 16, which are respectively communicated with the air pump 2 and the combustion chamber 3. One end of the air pump 2 is communicated with the atmosphere, and the other end is communicated with the combustion chamber 3. The air pump 2 pressurizes the air and sends it into the mixing chamber 16. The air pump 2 in the embodiment is preferably a vane type air pump, with a maximum flow of 2000 kg / h, simulating the intake stroke of the engine. An air filter 1 is further arranged at the air inlet of the air pump 2, which is used to filter impurities such as dust or floating matter in the air. An oil injector is arranged in the mixing chamber 16, which is used to inject fuel into the mixing chamber 16. The fuel and compressed air form a combustible mixture in the mixing chamber 16 and enter the combustion chamber 3. By adjusting the power of the air pump 2 and the fuel injection amount of the oil injector, the concentration of the combustible mixture and the air-fuel ratio under different working conditions of the engine are simulated. The detection environment is further close to the actual operating condition of the engine.

[0041] Optionally, in order to facilitate the collection of the flow, pressure and temperature data of the combustion exhaust gas in each manifold of the exhaust manifold assembly 14, a collection assembly 15 is further arranged on the exhaust manifold in the embodiment. The collection assembly 15 comprises a flow collection unit for collecting the flow data of the combustion exhaust gas, a pressure collection unit for collecting the pressure data of the combustion exhaust gas and a temperature collection unit for collecting the temperature data of the combustion exhaust gas. The flow collection unit can be a flow meter or a flow sensor, the pressure collection unit can be a pressure gauge or a pressure sensor, and the temperature collection unit can be a thermometer or a temperature sensor. The skilled in the art can compare the flow, pressure and temperature data of the combustion exhaust gas in each manifold collected by the collection assembly 15 to determine whether there is a problem of excessive air resistance or exhaust interference in the corresponding manifold. Since the specifications and working conditions of the exhaust manifold assembly 14 are different, the specific determination method and the determination of the standard value are different. The skilled in the art can calculate according to the actual test conditions combined with the existing formula, and here is not described in detail.

[0042] Specifically, the combustion chamber 3 is provided with an intake pipe 301 and an exhaust pipe 302, and a spark plug 303 is arranged at the top of the combustion chamber 3. The intake pipe 301 and the exhaust pipe 302 are both communicated with the combustion space. The combustible mixture enters the combustion space through the intake pipe 301. After the spark plug 303 is ignited, the combustible mixture burns to generate combustion exhaust gas, which is discharged through the exhaust pipe 302. After the temperature of the combustion exhaust gas is changed by the temperature control assembly, it enters the flow regulating assembly of the cylinder head assembly through the supply air duct 7, and then enters the exhaust gas passage through the intake duct 1101 of the flexible cylinder head 11 after the flow is regulated. After the exhaust valve 1103 is opened, the combustion exhaust gas enters the corresponding manifold of the exhaust manifold assembly 14 through the exhaust valve 1103, and the corresponding flow, pressure and temperature data are collected by the collection assembly 15.

[0043] It should be noted that most of the exhaust manifold assembly 14 in the actual use state does not need to be provided with sensors or instruments to collect relevant data. The exhaust manifold assembly 14 in the embodiment is connected with the cylinder head assembly by the flange 13, and the collection assembly 15 is arranged at the connection of the flange 13, so as to avoid the change or damage to the structure of the exhaust manifold assembly 14 in the exhaust manifold detection process. In other embodiments of the present application, those skilled in the art can also arrange the collection assembly 15 at other positions of the exhaust manifold assembly 14 according to the actual needs of the test, so as to meet the test requirements.

[0044] The present application provides a use method of an exhaust manifold detection device, which is applied to the exhaust manifold detection device in the embodiment. The use method comprises the following steps:

[0045] The air pump 2 introduces compressed air into the mixing chamber 16, and the fuel injector sprays fuel to form a combustible mixture with the compressed air in the mixing chamber 16;

[0046] The combustible mixture enters the combustion chamber 3 and ignites the combustible mixture in the combustion chamber 3;

[0047] The electromagnetic valve of the temperature control assembly is selectively turned on to adjust the temperature of the combustion exhaust gas to the corresponding temperature interval under the working condition;

[0048] The flow regulating assembly is adjusted so that the amount of combustion exhaust gas passing through the flow regulator 8 is in the corresponding flow interval under the working condition;

[0049] According to the actual situation, at least one exhaust valve 1103 is selectively opened to open the exhaust passage corresponding to the flexible cylinder head 11, and the remaining all exhaust valves 1103 are closed to close the exhaust passage corresponding to the flexible cylinder head 11, so as to simulate the actual exhaust sequence of the engine;

[0050] The flow, pressure and temperature data at the corresponding manifold are collected;

[0051] The air resistance and exhaust interference of the manifold are determined according to the flow, pressure and temperature data at the manifold, and the optimization iteration is compared with the simulation result.

[0052] Obviously, the above embodiments of the present application are only examples for the purpose of clear illustration, and are not intended to limit the embodiments of the present application. Based on the above description, those skilled in the art can also make other different forms of changes or modifications. Here, it is not necessary and impossible to exhaust all the embodiments. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. An exhaust manifold detection device, characterized in that, include: An exhaust manifold assembly (14) includes an exhaust manifold and a plurality of manifolds communicating with the exhaust manifold; Combustion chamber (3), wherein the combustion chamber (3) forms a combustion space, and a combustible mixture can enter the combustion space and burn in the combustion space, and form combustion exhaust gas after combustion; The cylinder head assembly includes a plurality of flexible cylinder heads (11), the number of which is the same as the number of manifolds. Each of the plurality of flexible cylinder heads (11) corresponds to a plurality of manifolds. A valve distribution assembly is fixedly provided on each of the flexible cylinder heads (11). Each flexible cylinder head (11) forms an exhaust gas passage, which is connected to the combustion space. The valve distribution assembly is used to open or close the exhaust gas passage, and the combustion exhaust gas can enter the manifold through the flexible cylinder head (11). The valve train assembly includes an exhaust valve (1103), a camshaft (19), and a cam (10). The cam (10) is fixedly mounted on the camshaft (19). The camshaft (19) is rotatably connected to the flexible cylinder head (11). The exhaust valve (1103) can open or close the exhaust gas passage. The cam (10) is used to drive the exhaust valve (1103) to open the exhaust gas passage. The valve train assembly also includes a spline (12), which is disposed at both ends of the camshaft (19), and two adjacent camshafts (19) are fixedly connected by the spline (12).

2. The exhaust manifold detection device according to claim 1, characterized in that, The cylinder head assembly also includes a drive motor (9), the output shaft of which is fixedly connected to the camshaft (19), and the drive motor (9) is used to drive the camshaft (19) to rotate.

3. The exhaust manifold detection device according to claim 1, characterized in that, The cylinder head assembly also includes multiple flow regulating components, the number of which is the same as the number of flexible cylinder heads (11). Each of the multiple flow regulating components corresponds to one of the multiple flexible cylinder heads (11). The flow regulating components are disposed between the combustion chamber (3) and the flexible cylinder head (11). The flow regulating components are used to change the amount of combustion exhaust gas entering the exhaust gas passage.

4. The exhaust manifold detection device according to claim 1, characterized in that, It also includes a temperature control component disposed between the combustion chamber (3) and the cylinder head assembly, the temperature control component being used to measure and change the temperature of the combustion exhaust gas entering the exhaust gas passage.

5. The exhaust manifold detection device according to claim 4, characterized in that, The temperature control component includes a temperature measuring tube (4), a heating tube (6), and a cooling tube (5). The temperature measuring tube (4) is connected to the combustion chamber (3) and the cylinder head assembly, respectively. The heating tube (6) and the cooling tube (5) are connected to the temperature measuring tube (4), respectively. The temperature measuring tube (4) is used to measure the temperature of the combustion exhaust gas, the heating tube (6) is used to heat the combustion exhaust gas, and the cooling tube (5) is used to cool the combustion exhaust gas.

6. The exhaust manifold detection device according to claim 1, characterized in that, It also includes a gas mixing assembly, which includes an air pump (2) and a mixing chamber (16). The mixing chamber (16) is connected to the air pump (2) and the combustion chamber (3) respectively. The air pump (2) is used to supply compressed air into the mixing chamber (16). An injector is provided in the mixing chamber (16) for injecting fuel into the mixing chamber (16). The fuel and the compressed air form a combustible mixture in the mixing chamber (16) and enter the combustion chamber (3).

7. The exhaust manifold detection device according to any one of claims 1-6, characterized in that, The manifold is also equipped with a collection component (15), which is used to collect the flow rate, pressure and temperature of the combustion exhaust gas in the manifold.

8. The method of using the exhaust manifold detection device, characterized in that, The method of using the exhaust manifold detection device according to any one of claims 1-7 includes: Ignite the combustible mixture in the combustion chamber (3); Open at least one of the exhaust gas passages of the flexible cylinder head (11) and close the exhaust gas passages of the remaining flexible cylinder heads (11).

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