Miller cycle supercharged diesel engine test bench

Abstract

The application discloses a Miller cycle supercharged diesel engine test bench, and relates to the technical field of engine detection. The test bench comprises a test cabin, a positioning assembly movably arranged in the test cabin and used for receiving or sending out the supercharged diesel engine, a dual-fuel supply assembly used for providing base diesel oil and bio-diesel oil for the supercharged diesel engine, and a gas detector arranged in the test cabin and used for detecting the emission of the supercharged diesel engine. The gas detector is configured to adjust the proportion of the base diesel oil and the bio-diesel oil provided by the dual-fuel supply assembly based on the detected emission. The supercharged diesel engine works based on the Miller cycle. The test bench can simulate the operation of the supercharged diesel engine under a plateau environment, and thus provides guidance for the proportion of the base diesel oil and the bio-diesel oil.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of engine detection, and particularly relates to a Miller cycle supercharged diesel engine test bench. BACKGROUND

[0002] In plateau areas, the essence of the performance decline of diesel engines is the combustion deterioration problem caused by the reduction of oxygen content in the cylinder. Oxygen-containing fuel is also one of the important ways to restore the performance of diesel engines in plateau areas. Biodiesel is a typical oxygen-containing fuel, and has a higher cetane number and complete combustion. In plateau areas, diesel engines burning biodiesel can help alleviate the incomplete combustion problem caused by the oxygen-deficient environment in plateau areas. However, compared with pure diesel, the blending of biodiesel in diesel engines will lead to higher nitrogen oxide (NOx) emissions.

[0003] Existing research shows that blending appropriate proportions of biodiesel combined with Miller cycle is an easier way to improve thermal efficiency and reduce pollutant emissions. As a key technology for in-cylinder purification, Miller cycle, by advancing or delaying the closing time of the intake valve, makes the effective compression ratio less than the expansion ratio, has the potential to improve thermal efficiency and reduce NOx emissions, and has become a research hotspot.

[0004] However, the existing research on the blending of biodiesel in diesel engines combined with Miller cycle in plateau areas is still very limited, which is specifically manifested as: it is difficult to simulate the operation of supercharged diesel engines in plateau environments, and thus to provide guidance for the proportion of base diesel and biodiesel.

[0005] Therefore, it is necessary to provide a Miller cycle supercharged diesel engine test bench to solve the above problems. SUMMARY

[0006] To solve the above problems, the present application provides the following technical scheme: a Miller cycle supercharged diesel engine test bench, comprising: a test cabin; a positioning assembly movably arranged in the test cabin and used for receiving or sending out the supercharged diesel engine; a dual-fuel supply assembly used for providing base diesel and biodiesel for the supercharged diesel engine; a gas detector arranged in the test cabin and used for detecting the emission of the supercharged diesel engine; the gas detector is configured to adjust the proportion of base diesel and biodiesel provided by the dual-fuel supply assembly based on the detected emission; and the supercharged diesel engine works based on the Miller cycle.

[0007] Further, the dual fuel supply assembly comprises a base plate, the bottom of which is provided with two dispensing assemblies; the liquid outlet ends of the two dispensing assemblies are respectively connected with a collecting pipe; the two collecting pipes are arranged in a V shape and are connected with a mixing cylinder, the mixing cylinder being used for supplying liquid to the supercharged diesel engine; the liquid inlet end of one dispensing assembly is connected with a first supply cylinder, and the liquid inlet end of the other dispensing assembly is connected with a second supply cylinder.

[0008] Further, the dispensing assembly comprises a dispensing bin, a temporary storage bin connected with one side of the dispensing bin through a connecting pipe, a preheater used for controlling the temperature of the temporary storage bin, a suction bin connected with the other side of the dispensing bin and provided with a piston, a first telescopic rod connected with the piston and used for driving the piston to move in the suction bin, a one-way valve arranged in the connecting pipe, and the bottom of the dispensing bin being connected with the collecting pipe.

[0009] Further, the inner wall of the connecting pipe comprises an integral shrinkage portion, a straight cylinder portion and an expansion portion; a paddle is rotatably arranged in the dispensing bin, one end of the paddle being arranged adjacent to the expansion portion.

[0010] Further, one end of the paddle is connected with a connecting rod, and a second telescopic rod is hingedly arranged between the other end of the connecting rod and the base plate.

[0011] Further, the positioning assembly comprises a sliding seat movably arranged in the test cabin, a bearing seat, the top of which is fixed with two symmetrically arranged first side plates and two symmetrically arranged second side plates, wherein the first side plates are hingedly connected with the sliding seat, a hydraulic rod hingedly arranged between the sliding seat and the second side plates, and a bottom plate fixed on the sliding seat and used for bearing the supercharged diesel engine.

[0012] Further, the bearing seat is further fixed with a protective frame, the protective frame being provided with a plurality of symmetrically arranged first locking assemblies; the bearing seat is further provided with a plurality of second locking assemblies located at the side of the first locking assemblies.

[0013] Further, the first locking assembly comprises a locking rod fixed on the protective frame and having a telescopic locking end, a locking disc fixed on the locking end, a plurality of locking columns and a plurality of locking cylinders arranged on the locking disc, and a first strain gauge arranged on the locking disc and corresponding to the locking columns and the locking cylinders, and used for detecting locking force or vibration force.

[0014] Further, the second locking assembly comprises: an angle plate fixed on the bearing seat, one side of the angle plate being fixed with a limiting seat; a deflection arm hinged below the angle plate; a plurality of elastic members connected between the deflection arm and the limiting seat; an adjusting seat fixed on the deflection arm; and an adjusting rod threadedly connected to the adjusting seat, an end of the adjusting rod being fixed with a pressing seat for pressing the supercharged diesel engine, a second strain gauge being embedded in the pressing seat for detecting locking force or vibration force.

[0015] Compared with the prior art, the application provides a Miller cycle supercharged diesel engine test bench, which has the following beneficial effects:

[0016] The application simulates high and low temperatures and the like of a plateau through the test cabin, and simulates vehicle uphill, downhill, acceleration braking and the like postures in combination with the positioning assembly. The double dynamic simulation of the environment and the postures can truly expose the performance of the engine under complex working conditions.

[0017] The application constructs a real-time monitoring of emissions through a gas detector, automatic adjustment of the proportion of biodiesel and base diesel to achieve the best environmental performance, and introduces a strain gauge to monitor engine vibration, and takes NVH (noise, vibration and harshness) performance as another optimization target, so as to find the optimal fuel ratio. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 Fig. 1 is a structural schematic view of a Miller cycle supercharged diesel engine test bench;

[0019] Figure 2 Fig. 3 is a three-dimensional structural schematic view of a positioning assembly, a first locking assembly and a second locking assembly in the application;

[0020] Figure 3 Fig. 4 is a three-dimensional structural schematic view of a first locking assembly and a second locking assembly in the application;

[0021] Figure 4 Fig. 5 is a three-dimensional structural schematic view of a dual-fuel supply assembly in the application;

[0022] Figure 5 Fig. 6 is a sectional structural schematic view of a dual-fuel supply assembly in the application;

[0023] Figure 6 Fig. 7 is an enlarged structural schematic view of A in Fig. 5; Figure 5

[0024] ​In the diagram: 1. Test chamber; 2. Positioning assembly; 21. Slide; 22. Bearing seat; 23. Protective frame; 24. First side plate; 25. Second side plate; 26. Hydraulic rod; 27. Base plate; 3. First locking assembly; 31. Locking rod; 32. Locking disc; 33. Locking column; 34. Locking cylinder; 4. Second locking assembly; 41. Angle plate; 42. Deflection arm; 43. Limiting seat; 44. Elastic element; 45. Adjusting seat; 46. Adjusting rod; 47. Pressure seat; 5. Double... 51. Fuel supply assembly; 52. Base plate; 53. Feeding assembly; 54. Manifold; 55. First feeding cylinder; 56. Second feeding cylinder; 57. Mixing cylinder; 58. Feeding bin; 59. Temporary storage bin; 50. Connecting pipe; 51. Preheater; 52. Suction bin; 52. First telescopic rod; 52. Paddle; 52. Second telescopic rod; 52. Connecting rod; 523. Contraction section; 5232. Straight cylinder section; 5233. Expansion section; 6. Gas detector. Detailed Implementation

[0025] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms are interchangeable where appropriate; this is merely a way of distinguishing objects with the same attributes in the embodiments of this application. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion, so that a process, method, system, product, or apparatus that comprises a series of elements is not necessarily limited to those elements, but may include other elements not explicitly listed or inherent to those processes, methods, products, or apparatuses.

[0026] Example: In this embodiment of the invention, please refer to... Figures 1-6 A Miller cycle turbocharged diesel engine test bench is provided, including a test chamber 1. The test chamber 1 is used to simulate low-pressure high-temperature environment or low-pressure low-temperature environment. For example, the test chamber 1 includes a low-pressure control unit and a temperature control unit. The low-pressure control unit is used to simulate low-pressure environment, while the temperature control unit is used to simulate different temperatures. By combining the temperature control unit with the low-pressure control unit, it is possible to simulate low-pressure high-temperature environment or low-pressure low-temperature environment, thereby simulating different environments in high-altitude areas. This provides a test bench for turbocharged diesel engines that is close to the actual operating conditions.

[0027] A positioning assembly 2 is movably arranged in the test cabin 1, and is used to receive or send out the supercharged diesel engine. Specifically, the positioning assembly 2 comprises a sliding base 21 movably arranged in the test cabin 1, a bearing seat 22 having two symmetrically arranged first side plates 24 and two symmetrically arranged second side plates 25 fixed to the top of the bearing seat 22, wherein the first side plates 24 are hinged to the sliding base 21, a hydraulic rod 26 hinged between the sliding base 21 and the second side plates 25, and a bottom plate 27 fixed to the sliding base 21 and used to bear the supercharged diesel engine.

[0028] The entire positioning assembly 2 is installed on the guide rail of the test cabin 1 through the sliding base 21, and the sliding base 21 can bear the supercharged diesel engine to move into or out of the test cabin 1. This solves the problem of convenience of installation, disassembly and maintenance of the supercharged diesel engine. During testing, the supercharged diesel engine is sent into the test cabin 1 to a designated position, and after testing is completed, it is moved out of the test cabin 1.

[0029] In the initial state, the hydraulic rod 26 is in a fixed length, and the supercharged diesel engine is in a horizontal posture.

[0030] When it is necessary to adjust the angle of the supercharged diesel engine, the hydraulic rod 26 is controlled to extend or retract. The bearing seat 22 is hinged to the sliding base 21 through the first side plates 24, and the hinge point constitutes a fixed rotation axis. When the hydraulic rod 26 is extended, it pushes the second side plates 25, so that the entire bearing seat 22 rotates upward around the hinge point of the first side plates 24; when the hydraulic rod 26 is retracted, it pulls the bearing seat 22 to rotate downward, thereby simulating the posture of the vehicle under different road conditions.

[0031] It should be noted that the conventional engine bearing frame is mostly fixed horizontally and cannot simulate the real dynamic posture of the vehicle. The positioning assembly 2 can simulate the posture of driving uphill / downhill and accelerating / braking.

[0032] In addition, the supercharged diesel engine is provided with basic diesel oil and bio-diesel oil by a dual-fuel supply assembly 5, the dual-fuel supply assembly 5 supplies the mixed fuel of the basic diesel oil and the bio-diesel oil to the engine according to an initially set proportion, and the dual-fuel supply assembly 5 comprises a base plate 51 having two dispensing assemblies 52 arranged at the bottom, two liquid outlet ends of the two dispensing assemblies 52 are respectively connected to a collecting pipe 53, the two collecting pipes 53 are arranged in a V shape and are connected to a mixing cylinder 56, the mixing cylinder 56 is used to supply liquid to the supercharged diesel engine, a liquid inlet end of one dispensing assembly 52 is connected to a first supply cylinder 54, and a liquid inlet end of the other dispensing assembly 52 is connected to a second supply cylinder 55.

[0033] The first supply cylinder 54 stores base diesel, and the second supply cylinder 55 stores bio-diesel. Each supply cylinder (the first supply cylinder 54 and the second supply cylinder 55) is connected to an independent dosing unit 52.

[0034] The dosing unit 52 is an active control unit. It can supply fuel in a specific ratio (for example, 70% diesel and 30% bio-diesel). The fuel from the two dosing units 52 flows into the respective collection pipes 53.

[0035] The two collection pipes 53 are designed in a V shape. The V shape naturally guides the two independent flows smoothly to a common merging point, reducing the sharp change in the direction of the fluid. The two fuels merge at the end of the V-shaped pipe and then flow into the mixing cylinder 56.

[0036] The mixing cylinder 56 can be designed with static mixers (such as helical blades), spoilers, or use the special structure of the cylinder itself to generate turbulence. When the two fuels enter the mixing cylinder 56, they will undergo repeated division, rotation, and merging, forming a homogeneous mixture of the mixed fuel before flowing out. Details are not described here.

[0037] In order to better adjust the ratio of base diesel and bio-diesel, in the embodiment, the test cabin 1 is also provided with a gas detector 6, which is used to detect the emission of the supercharged diesel engine; the gas detector 6 is configured to adjust the ratio of base diesel and bio-diesel provided by the dual-fuel supply assembly 5 based on the detected emission.

[0038] More specifically, when the gas detector 6 detects that the emission exceeds the standard (such as an increase in NOx), the system recalculates the ratio of base diesel and bio-diesel, and the dosing unit 52 adjusts the output flow of the two fuels based on the ratio, thereby quickly changing the ratio of the mixed fuel supplied to the supercharged diesel engine and achieving real-time emission optimization.

[0039] It should be noted that the supercharged diesel engine works based on the Miller cycle.

[0040] The oxygen-containing property of bio-diesel helps to alleviate the situation of combustion deterioration in plateau areas, but the main problem of blending bio-diesel is that it generates higher NOx emissions. EGR is one of the effective measures to reduce NOx emissions. However, high-pressure EGR has a strong coupling relationship with the turbocharging system, and the use of EGR in the plateau low-intake-density environment will greatly deteriorate the combustion condition, and even cause unstable combustion. The traditional diffusion combustion mode of diesel engines makes there is an inherent trade-off relationship between NOx and fuel consumption, and between NOx and PM. The Miller cycle is an effective technical means for diesel engines to reduce NOx emissions and improve thermal efficiency.

[0041] That is, the supercharged diesel engine starts, based on the Miller cycle work. Its core feature is that the expansion ratio is greater than the compression ratio, usually achieved by closing the intake valve in advance. This makes the working stroke (expansion stroke) longer than the compression stroke, which can make better use of the energy of the combustion gas and improve thermal efficiency. The supercharger pressurizes more air into the cylinder to make up for the lack of charging efficiency of the Miller cycle at low speed, and to ensure sufficient intake at high altitude and low pressure environment, so as to maintain the power output.

[0042] Even if the supercharged diesel engine works based on the Miller cycle, there may still be a problem of generating higher NOx emissions, so in this embodiment, the gas detector 6 analyzes the key components in the exhaust gas in real time, and converts these emission data into electrical signals. If the NOx emission is detected to be too high, the proportion of base diesel and biodiesel is adjusted.

[0043] In a specific embodiment, the discharging assembly 52 comprises: a discharging bin 521; a temporary storage bin 522, which is communicated with one side of the discharging bin 521 through a connecting pipe 523; a preheater 524 for temperature control of the temporary storage bin 522; a suction bin 525, which is communicated with the other side of the discharging bin 521 and is provided with a piston; a first telescopic rod 526 connected to the piston for driving the piston to move in the suction bin 525; a one-way valve arranged in the connecting pipe 523; and the bottom of the discharging bin 521 is connected with the collecting pipe 53.

[0044] The inner wall of the connecting pipe 523 comprises an integral shrinkage portion 5231, a straight cylinder portion 5232 and an expansion portion 5233; a paddle 527 is rotatably arranged in the discharging bin 521, and one end of the paddle 527 is arranged adjacent to the expansion portion 5233.

[0045] In addition, one end of the paddle 527 is connected with a connecting rod 529; the other end of the connecting rod 529 is hingedly connected with the second telescopic rod 528 between the base plate 51.

[0046] Before starting or in standby mode, the preheater 524 is started to control the temperature of the fuel in the temporary storage bin 522. For fuels such as biodiesel whose viscosity changes greatly with temperature, maintaining a constant temperature can ensure that their fluidity is always in an optimal state.

[0047] Afterwards, the first telescopic rod 526 is retracted, driving the piston in the suction chamber 525 to move backwards. This makes the volume of the suction chamber 525 increase, and a negative pressure is formed inside. This negative pressure is transmitted to the feeding chamber 521 through the internal passage, making the pressure in the feeding chamber 521 lower than that in the temporary storage chamber 522. Under the action of the pressure difference, the fuel in the temporary storage chamber 522 is "sucked" into the connecting pipe 523. The one-way valve (not shown in the figure) in the connecting pipe 523 opens in this direction, allowing the fuel to pass through. When the fuel flows through the connecting pipe 523, the second telescopic rod 528 drives the paddle 527 to swing through the connecting rod 529. The paddle 527 is located at the outlet of the expansion part 5233, which serves to stir the fuel, prevent sedimentation or caking, and ensure that the fuel entering the connecting pipe 523 is uniform and smooth.

[0048] When the piston moves to the predetermined position, the first telescopic rod 526 begins to extend, pushing the piston to move forward. The positive pressure generated by the forward displacement of the piston pushes the fuel in the feeding chamber 521 into the collecting pipe 53 through the outlet at the bottom of the feeding chamber 521. At this time, the one-way valve in the connecting pipe 523 closes under the reverse pressure, ensuring that the fuel does not flow back into the temporary storage chamber 522.

[0049] It should also be explained that even if the second telescopic rod 528 does not drive the paddle 527 to swing, the paddle 527 will still vibrate under the impact of the fuel and react on the fuel.

[0050] In a specific embodiment, the carrier seat 22 is also fixed with a protective frame 23, and a plurality of first locking assemblies 3 are symmetrically arranged on the protective frame 23; a plurality of second locking assemblies 4 are arranged on the carrier seat 22 and located on the side of the first locking assemblies 3.

[0051] The first locking assembly 3 comprises a locking rod 31 fixed to the protective frame 23 and having a telescopic locking end, a locking disc 32 fixed to the locking end, a plurality of locking columns 33 and a plurality of locking cylinders 34 arranged on the locking disc 32, and a first strain gauge arranged on the locking disc 32 and corresponding to the locking columns 33 and the locking cylinders 34 for detecting locking force or vibration force.

[0052] When the supercharged diesel engine is hoisted or moved onto the carrier seat 22, the plurality of locking columns 33 on the locking disc 32 are aligned with and inserted into the mounting holes reserved on the supercharged diesel engine. This multi-point column-hole cooperation structure first realizes the positioning of the supercharged diesel engine, prevents misalignment during locking, and avoids unnecessary installation stress.

[0053] In practice, the locking rod 31 is driven to extend, pushing the locking disc 32 to move towards the supercharged diesel engine. When the locking post 33 is fully inserted, the locking rod 31 continues to extend, starting to apply a pre-tightening force to the supercharged diesel engine. As the pre-tightening force increases, the locking disc 32 will undergo a slight elastic deformation. The first strain gauge will capture this deformation and convert it into an electrical signal. According to this signal, the actual locking force can be calculated.

[0054] If the locking force does not reach the preset safety threshold, continue to drive the locking rod 31 to extend.

[0055] If the locking force reaches or slightly exceeds the threshold, stop driving and complete locking.

[0056] Once the supercharged diesel engine starts running, complex vibrations will be generated inside due to combustion and mechanical movement. These vibrations will be transmitted to the locking post 33 and the locking disc 32 through the mounting points.

[0057] At this time, the role of the first strain gauge changes from a static force sensor to a dynamic vibration sensor.

[0058] In a specific embodiment, the second locking assembly 4 includes: an angle plate 41 fixed to the bearing seat 22, one side of the angle plate 41 is fixed with a limiting seat 43; a deflection arm 42 hinged below the angle plate 41; a plurality of elastic members 44 connected between the deflection arm 42 and the limiting seat 43; an adjusting seat 45 fixed to the deflection arm 42; an adjusting rod 46 threadedly connected to the adjusting seat 45, the end of the adjusting rod 46 is fixed with a pressing seat 47 for pressing the supercharged diesel engine, and a second strain gauge is embedded in the pressing seat 47 for detecting the locking force or vibration force.

[0059] The operator rotates the adjusting rod 46, and due to its threaded connection with the adjusting seat 45, the pressing seat 47 will slowly advance until its end surface lightly contacts the side surface of the supercharged diesel engine or another mounting point.

[0060] Continuing to rotate the adjusting rod 46, the pressing seat 47 will apply a pushing force to the supercharged diesel engine. This force is transmitted through the deflection arm 42, causing it to deflect around the hinge point. At this time, the plurality of elastic members 44 connected between the deflection arm 42 and the limiting seat 43 will be compressed, generating an elastic force opposite to the direction of the pushing force. When the pushing force and the elastic force are balanced, the system reaches a stable pre-tightening state.

[0061] Once the supercharged diesel engine starts running, complex vibrations will be generated inside due to combustion and mechanical movement. These vibrations will be transmitted to the elastic members 44 through the pressing seat 47, and the elastic members 44 will act like shock absorbers, dissipating part of the vibration energy, thereby preventing or weakening the transmission of vibrations to the bearing seat 22.

[0062] Similarly, the second strain gauge embedded in the pressure seat 47 can sense the pressure change on the contact surface between the pressure seat 47 and the supercharged diesel engine in real time.

[0063] This pressure change contains two key information: one is the initial static pre-tightening force; the other is the dynamic vibration force transmitted when the supercharged diesel engine is running. By analyzing these signals, the force state and vibration of the locking point can be monitored in real time.

[0064] That is, the first locking assembly 3 is responsible for fixing the reference position of the supercharged diesel engine on the bearing seat 22. The second locking assembly 4 applies an adjustable and elastic pre-tightening force to other parts of the supercharged diesel engine on the basis of the positioning of the first locking assembly 3.

[0065] As mentioned above, the gas detector 6 is configured to adjust the proportion of base diesel and bio-diesel provided by the dual fuel supply assembly 5 based on the detected emissions, which is essentially an adjustment targeting environmental protection. Of course, it is also possible to adjust targeting smoothness, for example, the first strain gauge and the second strain gauge are configured to adjust the proportion of base diesel and bio-diesel provided by the dual fuel supply assembly 5 based on vibration, which are essentially multi-target optimization. In this process, there may be conflicts, so the preset weight or strategy should be weighed: Strategy A (emission priority): prioritize the lowest emissions while ensuring that the vibration does not exceed the safety red line. Strategy B (smoothness priority): prioritize the best NVH performance based on meeting the bottom line of emission regulations. Strategy C (comprehensive optimization): find a "Pareto optimal solution" for emissions and vibration, which is the best balance point for both.

[0066] The above is only the preferred embodiment of the present application, but the protection scope of the present application is not limited to this. Any skilled person in the art can make equivalent replacements or changes to the technical range disclosed in the present application according to the technical solution and inventive concept of the present application, which should be covered within the protection scope of the present application.

Claims

1. A Miller cycle turbocharged diesel engine test bench, characterized in that, include: Test chamber (1); The positioning component (2) is movably disposed within the test chamber (1) for receiving or sending out the turbocharged diesel engine; Dual-fuel supply assembly (5) for supplying base diesel and biodiesel to the turbocharged diesel engine; A gas detector (6) is installed inside the test chamber (1) to detect the emissions of the turbocharged diesel engine; The gas detector (6) is configured to adjust the ratio of base diesel and biodiesel supplied by the dual-fuel supply assembly (5) based on the detected emissions. The turbocharged diesel engine operates based on the Miller cycle. The positioning component (2) includes: A slide (21) is movably disposed within the test chamber (1); The support base (22) has two symmetrically arranged first side plates (24) and two symmetrically arranged second side plates (25) fixed on its top, wherein the first side plates (24) are hinged to the slide (21); The hydraulic rod (26) is hinged between the slide (21) and the second side plate (25); A protective frame (23) is also fixed on the support base (22), and a plurality of symmetrically arranged first locking components (3) are provided on the protective frame (23). The support base (22) is also provided with a plurality of second locking components (4) located on the side of the first locking component (3); The first locking component (3) includes: Locking rod (31), which is fixed to the protective frame (23) and has a retractable locking end; Locking disc (32) is fixed to the locking end; Multiple locking pins (33) and multiple locking cylinders (34) are disposed on the locking disc (32); The first strain gauge is disposed on the locking disc (32), corresponding to the locking pin (33) and the locking cylinder (34), and is used to detect the locking force or vibration force; The second locking component (4) includes: An angle plate (41) is fixed on the bearing seat (22), and a limit seat (43) is fixed on one side of the angle plate (41). A deflection arm (42) is hinged below the angle plate (41); Multiple elastic elements (44) are connected between the deflection arm (42) and the limiting seat (43); Adjustment seat (45) is fixed on the deflection arm (42); An adjusting rod (46) is threaded to the adjusting seat (45). A pressure seat (47) is fixed to the end of the adjusting rod (46) for pressing the turbocharged diesel engine. A second strain gauge is also embedded in the pressure seat (47) for detecting locking force or vibration force.

2. The Miller cycle turbocharged diesel engine test bench according to claim 1, characterized in that, The dual-fuel supply assembly (5) includes a base plate (51) with two feeding assemblies (52) at its bottom. The liquid outlets of the two feeding assemblies (52) are respectively connected to a collecting pipe (53); The two manifolds (53) are arranged in a V-shape and converge to connect to the mixing cylinder (56), which is used to supply liquid to the turbocharged diesel engine; One of the feeding components (52) has its liquid inlet end connected to the first feeding cylinder (54), and the other feeding component (52) has its liquid inlet end connected to the second feeding cylinder (55).

3. The Miller cycle turbocharged diesel engine test bench according to claim 2, characterized in that, The feeding assembly (52) includes: Feeding bin (521); The temporary storage bin (522) is connected to one side of the unloading bin (521) via a connecting pipe (523); A preheater (524) is used to control the temperature of the temporary storage chamber (522); The suction chamber (525) is connected to the other side of the discharge chamber (521) and a piston is installed inside it; The first telescopic rod (526) is connected to the piston and is used to drive the piston to move within the suction chamber (525); A one-way valve is provided in the connecting pipe (523); The bottom of the discharge hopper (521) is connected to the collection pipe (53).

4. The Miller cycle turbocharged diesel engine test bench according to claim 3, characterized in that, The inner wall of the connecting pipe (523) includes an integrally formed contraction section (5231), a straight section (5232), and an expansion section (5233). A paddle (527) is rotatably disposed in the feeding bin (521), with one end of the paddle (527) located adjacent to the expansion portion (5233).

5. The Miller cycle turbocharged diesel engine test bench according to claim 4, characterized in that, The paddle (527) is connected to one end of the connecting rod (529); The other end of the connecting rod (529) is hinged to the base plate (51) with a second telescopic rod (528).

6. The Miller cycle turbocharged diesel engine test bench according to claim 1, characterized in that, The positioning component (2) further includes: The base plate (27) is fixed on the slide (21) and is used to support the turbocharged diesel engine.

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