WO2021008153A1

WO2021008153A1 - Engine having supercharging system

Info

Publication number: WO2021008153A1
Application number: PCT/CN2020/079779
Authority: WO
Inventors: 朱明超; 陈翔; 刘进伟; 欧阳旭; 李国卿
Original assignee: 重庆隆鑫通航发动机制造有限公司; 隆鑫通用动力股份有限公司
Priority date: 2019-07-18
Filing date: 2020-03-17
Publication date: 2021-01-21
Also published as: CN110344929A

Abstract

An engine having a supercharging system, comprising an engine body (1), an air inlet system, an exhaust system and a supercharging system, the supercharging system being in communication with the air inlet system and/or the exhaust system by means of a corresponding vibration damping bellows section; the air inlet system comprises an air inlet pipe (9) which is provided with an air inlet resonance chamber (10), the air inlet resonance chamber (10) being located between the supercharging system and the air inlet of the engine. The engine utilizes a combination of the bellows section and air inlet resonance so as to keep the supercharging system of the engine stable and to prevent resonance.

Description

Engine with supercharging system

Technical field

The invention relates to the field of engines, in particular to an engine that uses a supercharging system to increase power.

Background technique

The main function of turbocharging is to increase the air intake of the engine, thereby increasing the power and torque of the engine. The turbocharging system in the prior art mainly includes a supercharging device, an intercooler and other equipment. The supercharging device includes a turbine assembly installed in the exhaust system and a supercharger (air compressor assembly) installed in the intake system. The exhaust pressure drives the turbine assembly to drive the supercharger to increase the intake pressure, thereby increasing the power of the engine.

In the prior art, because the engine exhaust has a certain frequency, especially for single-cylinder engines, the turbocharger system damage caused by the vibration caused by the engine itself and the exhaust pulse frequently occurs. The use cost and maintenance cost of the engine are greatly increased, affecting the normal use of the engine.

Therefore, it is necessary to improve the prior art supercharging system, which has better vibration isolation performance, effectively avoids the transmission of the engine itself and the intake and exhaust vibrations to the supercharging system, avoids resonance, and thus helps to ensure the supercharging system. Normal operation, reducing failure rate.

Summary of the invention

In view of this, the purpose of the present invention is to provide an engine with a supercharging system. The supercharging system has better vibration isolation performance, effectively avoiding the transmission of the engine itself and the intake and exhaust vibrations to the supercharging system, and avoiding resonance , Which will help ensure the normal operation of the supercharging system and reduce the failure rate.

The engine with a supercharging system of the present invention includes an engine body, an intake system, an exhaust system, and a supercharging system. The supercharging system is connected to the intake system and/or the exhaust system through a corresponding damping bellows section; For the engine, the intake system includes components such as an air filter and an intake pipe, and the exhaust system includes components such as an exhaust pipe and a muffler, and the engine body also includes some necessary components, which belong to the prior art and will not be repeated here. The supercharging system includes a turbo component driven by the exhaust system, a supercharging component (compressor) and an intercooler driven by the turbine component, which belong to the prior art and will not be repeated here; The damping bellows section connected to the intake system and/or exhaust system means that there is a damping bellows section connected in the exhaust pipe section between the turbine assembly and the engine, or/and between the supercharger assembly and the engine The intake pipe section is connected with a vibration damping bellows section; the bellows is a cylindrical thin-walled corrugated pipe with multiple transverse corrugations, which has better adaptability to axial and radial forces, and thus has vibration isolation performance. The bellows isolates engine vibration, effectively avoiding the transmission of the engine itself and the intake and exhaust vibrations to the supercharging system, avoiding resonance, thereby helping to ensure the normal operation of the supercharging system and reducing the failure rate; the intake system includes an intake pipe , The intake duct is provided with an intake resonance cavity, which is located between the supercharging system and the engine intake; as shown in the figure, the intake resonance cavity is installed between the intercooler and the supercharger In combination with the setting of the bellows section, the frequency characteristics of the intake or/and exhaust are eliminated from the aerodynamic source and mechanical isolation, so as to help maintain the stable operation of the engine's supercharging system to avoid resonance, and thus help Ensure the normal operation of the booster system, reduce the failure rate, thereby reducing the use and maintenance costs.

Further, the exhaust system includes an exhaust pipe connected between the exhaust port of the engine and the muffler, the damping bellows section is an integral part of the exhaust pipe, and the damping bellows section is located in the exhaust pipe in the exhaust pipe. The pipe section between the supercharging system and the exhaust port of the engine; due to the large exhaust pulse of the engine exhaust system (especially the single cylinder), the engine itself and the exhaust system will vibrate greatly, so the exhaust system is provided with ripples The tube helps to block the initial vibration of the exhaust system itself and the vibration of the engine itself from being transmitted to the supercharging system, effectively avoiding the transmission of the engine itself and exhaust vibration to the supercharging system, avoiding resonance, and helping to ensure supercharging The normal operation of the system reduces the failure rate and saves manufacturing costs.

Further, the exhaust pipe is provided with an exhaust resonant cavity, the exhaust resonant cavity is located between the engine exhaust port and the supercharging system, and is located at the pipe section or/and rear of the exhaust pipe before the exhaust resonant cavity The pipe section is provided with a damping bellows section; the present invention is provided with an exhaust resonant cavity in front of the turbine assembly. By setting the exhaust resonant cavity on the exhaust pipe, the fluctuation caused by the frequency characteristics of the exhaust gas can be effectively reduced for driving the turbine assembly It avoids the problem that the supercharging effect cannot be reflected due to the negative power of the pumping gas, improves the engine power, and has a simple structure, which reduces engine energy consumption and emissions, and does not increase the cost of the supercharging system; of course, there is also Some components such as resonant baffle can be installed; through the exhaust resonant cavity combined with the vibration damping bellows (front or/and rear of the exhaust resonant cavity) and the intake resonant cavity, the elimination can be greatly eliminated and transferred to the supercharger System vibration.

Further, the damping bellows section includes a front damping bellows section of the pipe section between the engine exhaust port and the exhaust resonance cavity and a rear damping bellows section of the pipe section between the exhaust resonance cavity and the supercharging system; Preliminarily isolate the vibration through the front damping bellows section, and then buffer the exhaust pulse through the exhaust resonance cavity to further eliminate the vibration caused by the pulse, and finally isolate the remaining vibration through the rear damping bellows section to protect the supercharging system from vibration. Damage.

Further, the axial dynamic stiffness of the damping bellows section is 120-160N/mm, preferably 140N/mm, and the radial dynamic stiffness is 30-40N/mm, preferably 35N/mm. The preferred parameters are suitable for a 650ml single-cylinder engine, This optimal parameter makes the surge tank-bellows system frequency 43 Hz, which is less than 1/2 of the engine vibration frequency, so as to reduce the vibration transmitted from the engine to the surge tank and ensure the strength of the vibration damping bellows section itself.

Further, the exhaust resonant cavity has a cylindrical structure, and the wall thickness is not less than 2mm, preferably 2mm, which can meet the requirements but does not increase the weight too much; the vibration of the exhaust resonant cavity wall plate is reduced from the body, and after testing, The vibration of the exhaust resonant cavity is reduced from 28.7g to 1.6g, a decrease of 94%; the exhaust pipe is connected to the exhaust resonant cavity in the radial direction, which increases the flow and mixing process of the airflow in the exhaust resonant cavity, which is beneficial to Ensure buffer voltage regulation;

For a 650ml single-cylinder engine, the length (height) of the exhaust cavity is 270mm, the inner diameter is 98mm, and the distance between the center of the pipe section of the exhaust pipe in and out of the exhaust cavity (radial access and communication) is 175mm, which ensures that the engine exhausts gas pressure On a stable basis, it can also play the role of silencing the expansion cavity, reducing the exhaust noise from 110dB to 103dB.

Further, it also includes a support reinforcement, the support reinforcement includes a first reinforcement for fixing and supporting the pipe section between the engine exhaust port and the front damping bellows section and a second reinforcement for fixing and supporting the muffler; The system actively strengthens to prevent vibration, combined with the bellows structure, to further eliminate the impact of vibration on the turbocharging system. For a 650ml single-cylinder engine, the entire system frequency is 128Hz and 245Hz, avoiding the engine vibration frequency 108Hz and 216Hz, and will not bring The system resonates to ensure the normal operation of the booster system.

Further, the exhaust pipe is provided with a bypass which is connected between the front exhaust pipe section of the supercharging system and the rear exhaust pipe section of the supercharging system, and the bypass is provided with control bypass opening and closing and opening. Control valve with a high degree of control; due to the effect of exhaust pressure, when the exhaust pressure is high, the turbo component driving the supercharger component will greatly increase the intake pressure. Excessive intake pressure will cause the overall intake to be unstable. Therefore, the control valve is used to control the opening of the bypass, so that part of the exhaust gas is directly discharged through the bypass without passing through the turbine assembly. At the same time, the bypass combined with the exhaust resonant cavity can effectively reduce the volatility of the gas entering the turbine assembly.

Further, the opening and closing of the control valve and the degree of opening and closing are controlled by the engine intake pressure interlock; the intake pressure interlock is used to control the exhaust gas entering the turbine assembly, and the rotation speed of the turbine assembly is directly adjusted to control the intake pressure. There are many kinds of interlocking control methods and structures. The pressure sensor can be used to detect the intake pressure and the opening and closing of the electronic control valve can be used. It can also be controlled by a pneumatic structure, all of which belong to your existing control The technology is not repeated here; the source of the intake pressure of this interlock control can be after the supercharger or before the supercharger, preferably after the supercharger, because the intake pressure in the pipe after the supercharger has a timely At the same time, it is the pressure after the supercharger is supercharged. The increase in pressure and fluctuation are more obvious, which is more conducive to the control of intake pressure.

Further, the intake pipe is connected with a pressure control branch line, and the pressure control branch line is connected to a control valve for delivering intake pressure to the control valve for controlling the opening and closing of the control valve and the degree of opening and closing; in this structure, use The pressure control branch line leads out of the air inlet and connects to the control port of the pneumatic control valve. It has the characteristic of directness, so as to quickly control the intake pressure and booster components; the control valve is a pneumatic spring control valve, which uses the intake pressure to control the control valve. The operation principle and control method of the pneumatic spring control valve belong to the prior art and will not be repeated here. Compared with the electronic control valve, it has the characteristics of simple structure, low failure rate and low cost.

Further, the engine is a single-cylinder engine; the volume of the exhaust resonant cavity is 1.5-9 times the engine displacement, and the exhaust resonant cavity in this volume range has the characteristics of better elimination of volatility, as shown in the figure It shows that for a single-cylinder engine, the engine power can be greatly improved, that is, the present invention is particularly suitable for single-cylinder engines.

Further, the volume of the intake resonant cavity is greater than 1.5 times the engine displacement. The intake resonant cavity of this volume, combined with the exhaust resonant cavity, greatly increases the stability in the near future and has a superimposing effect of improving engine power.

Further, the volume of the intake resonant cavity is 1.5 times the engine displacement, and the volume of the exhaust resonant cavity is 6 times the engine displacement. The preferred intake and exhaust resonant cavity volumes can greatly increase the engine power and increase To achieve the desired effect of turbocharging, especially for single-cylinder engines, while ensuring stable intake and improving engine efficiency; as shown in the figure, under the optimal intake and exhaust cavity volume conditions, the engine power The highest, higher than preferred and lower than preferred power all have a certain degree of reduction.

Further, the length of the exhaust pipe section including the front damping bellows section between the engine exhaust port and the exhaust resonance cavity is 100-400mm; this length range is combined with the volume parameter of the exhaust resonance cavity to facilitate the formation Resonance and buffering help to ensure the smoothness of the exhaust gas entering the turbine assembly. Combined with the bypass setting, the smoothness of the exhaust gas can be ensured, so that the supercharging system can run smoothly and realize effective control in the near future.

Further, the pressure control branch line is connected to the rear pipe section of the supercharging system of the intake pipe, which can directly reflect the pressure of the engine intake, thereby realizing effective control, ensuring smooth operation of the engine, improving power and combustion efficiency, and ultimately ensuring engine performance Emissions and reduce energy consumption.

The beneficial effects of the invention are: the engine with the supercharging system of the present invention uses the bellows itself to have better adaptability characteristics of axial and radial alternating forces, and uses the bellows to communicate exhaust or/and intake fluctuations and isolate them Engine vibration, so that the turbocharging system has better vibration isolation performance, effectively avoiding the engine itself and the intake or/and exhaust vibration from being transmitted to the turbocharging system. The bellows section is combined with the intake resonance, from the aerodynamic source and from The mechanical isolation jointly eliminates the frequency characteristics of intake or/and exhaust, thereby helping to maintain the stable operation of the engine's supercharging system to avoid resonance, thereby helping to ensure the normal operation of the supercharging system, reducing the failure rate, and reducing use and maintenance cost.

Description of the drawings

The present invention will be further described below in conjunction with the drawings and embodiments:

Figure 1 is a schematic diagram of the structural principle of the present invention;

Figure 2 is a diagram showing the influence of only connecting the intake resonant cavity on the engine power (different volumes);

Figure 3 is a diagram showing the influence of only connecting the exhaust resonant cavity on the engine power (different volumes);

Figure 4 is a graph showing the influence of the length of the exhaust pipe section between the engine exhaust port and the exhaust resonance cavity on the engine power;

Figure 5 is a diagram showing the influence of the improved intake and exhaust system on engine power;

Figure 6 is a schematic diagram of the structure of the present invention.

Detailed ways

As shown in the figure, the engine of the present invention includes an engine body 1, an intake system, an exhaust system, and a supercharging system. The supercharging system is connected to the intake system and/or the exhaust system through a corresponding damping bellows section. ; For the engine, the intake system includes components such as an air filter 8, an intake pipe 9, and the exhaust system includes components such as an exhaust pipe 3 and a muffler 7, and the engine body 1 also includes some necessary components, which belong to the prior art , Not repeat them here; and the supercharging system includes the turbine assembly 14 driven by the exhaust system, the supercharging assembly 12 (compressor) and the intercooler 11 driven by the turbine assembly 14, which belong to the prior art. This will not be repeated here; the supercharging system is connected to the intake system and/or the exhaust system through the corresponding damping bellows section means that there is a damping bellows section connected in the exhaust pipe section between the turbine assembly 14 and the engine body 1 , Or/and there is a damping bellows section communicating in the intake pipe section between the supercharger assembly and the engine; the bellows is a cylindrical thin-walled corrugated pipe with multiple transverse corrugations, with good axial and radial It has vibration isolation performance. The bellows is used to isolate engine vibration, which effectively prevents the engine itself and the vibration of intake and exhaust from being transmitted to the supercharging system, avoiding resonance, and then helping to ensure the normal operation of the supercharging system. Reduce the failure rate; the pipe diameter of the damping bellows section is subject to the corresponding air flow (intake and exhaust) normally passing through, which will not be repeated here; the air intake system includes an air intake pipe 9 which is provided with There is an intake resonant cavity 10, which is located between the supercharging system and the engine intake; as shown in the figure, the intake resonant cavity is installed between the intercooler 11 and the supercharger 12, and Combined with the setting of the bellows section, it eliminates the frequency characteristics of the intake or/and exhaust from the pneumatic source and mechanical isolation, thus helping to maintain the engine's supercharging system stable operation and avoiding resonance, thereby helping to ensure supercharging The normal operation of the system reduces the failure rate, thereby reducing the use and maintenance costs.

In this embodiment, the exhaust system includes an exhaust pipe 3 connected between the exhaust port of the engine and the muffler 7, the damping bellows section is a component of the exhaust pipe 3, and the damping bellows section is located The exhaust pipe 3 is the pipe section between the supercharging system and the exhaust port of the engine; due to the large exhaust pulse of the engine exhaust system (especially the single cylinder), the engine itself and the exhaust system will vibrate greatly, Therefore, the installation of bellows in the exhaust system helps to block the initial vibration of the exhaust system itself and the vibration of the engine itself from being transmitted to the supercharging system, and effectively avoiding the transmission of the engine itself and exhaust vibration to the supercharging system to avoid occurrence Resonance helps ensure the normal operation of the supercharging system, reduces the failure rate and saves manufacturing costs.

In this embodiment, the exhaust pipe is provided with an exhaust resonant cavity 2. The exhaust resonant cavity 2 is located between the engine exhaust port and the supercharging system, and is located in the exhaust pipe before the exhaust resonant cavity. The pipe section or/and the rear pipe section are provided with a vibration damping bellows section; the present invention is provided with an exhaust gas resonance cavity in front of the turbine assembly. By setting the exhaust gas resonance cavity on the exhaust pipe, the exhaust gas used to drive the turbine assembly can be effectively reduced. The volatility caused by frequency characteristics avoids the problem that the supercharging effect cannot be reflected due to the negative pumping power, improves the engine power, and has a simple structure, which reduces engine energy consumption and emissions, and does not increase the cost of the supercharging system; of course; , The resonant cavity can also be equipped with some resonant baffle and other components; through the exhaust resonant cavity combined with the damping bellows (front or/and rear of the exhaust resonant cavity) and the intake resonant cavity, the setting can be larger Elimination of the amplitude of the vibration transmitted to the supercharging system; as shown in the figure, the exhaust resonant cavity is connected to the exhaust pipe, that is, the air inlet of the exhaust resonant cavity 14 is connected to the engine exhaust port, and the air outlet is connected to the turbine assembly The air inlet, I will not repeat it here.

In this embodiment, the damping bellows section includes a front damping bellows section 15 of the pipe section 13 between the engine exhaust port and the exhaust resonant cavity 2 and a pipe section between the exhaust resonant cavity 2 and the supercharging system The rear damping bellows section 16; through the front damping bellows section, preliminary vibration isolation, and then through the exhaust resonance cavity to buffer the exhaust pulse to further eliminate the vibration caused by the pulse, and finally through the rear damping bellows section to isolate the remaining vibration, and then Protect the booster system from damage caused by vibration.

In this embodiment, the axial dynamic stiffness of the damping bellows section is 120-160N/mm, preferably 140N/mm, and the radial dynamic stiffness is 30-40N/mm, preferably 35N/mm, and the preferred parameters are suitable for a 650ml unit. Cylinder engine, this optimal parameter makes the pressure stabilization chamber-bellows system frequency 43Hz, which is less than 1/2 of the vibration frequency of the engine, so as to reduce the vibration transmitted from the engine to the stabilization chamber and ensure the strength of the damping bellows section itself .

In this embodiment, the exhaust resonant cavity has a cylindrical structure, and the wall thickness is not less than 2mm, preferably 2mm, which can meet the requirements without excessive weight increase; reduce the vibration of the exhaust resonant cavity wall from the body, To avoid rupture and damage of the exhaust resonant cavity, the vibration of the exhaust resonant cavity is reduced from 28.7g to 1.6g, a decrease of 94%; the exhaust pipe is connected to the exhaust resonant cavity in the radial direction, increasing the airflow The flow mixing process in the exhaust resonant cavity helps to ensure buffering and stabilization;

As shown in Figure 6, in this embodiment, it also includes a support reinforcement, the support reinforcement includes a first reinforcement 17 and a fixed support for fixedly supporting the pipe section between the engine exhaust port and the front damping bellows section The second reinforcement 18 of the muffler; actively strengthen the exhaust system to prevent vibration, and combine with the bellows structure to further eliminate the impact of vibration on the supercharging system. For a 650ml single-cylinder engine, the frequency of the entire system is 128Hz and 245Hz. The engine vibration frequency is 108Hz and 216Hz, which will not bring about system resonance and ensure the normal operation of the supercharging system; both the first reinforcement 17 and the second reinforcement 18 can adopt the structure of the reinforcement frame, and the structure can be adapted to strengthen the installation. , A pipe clamp structure can be used and a mechanical structure such as an installation connecting seat is not repeated here; as shown in Figure 6, one end of the first reinforcement member 17 is fixedly connected to the engine exhaust port and the front vibration damping bellows section. The other end of the pipe section is fixedly connected to the relevant position of the frame (the helicopter frame used to install the engine). In this embodiment, the suspension connected to the engine body is integrally fixed, which is represented by a thick solid line in Figure 1; One end of the second reinforcement member 18 is fixedly connected to the muffler, and the other end is connected to the relevant position of the frame (the helicopter frame used to install the engine), or, as in this embodiment, is fixedly connected to the rear vibration damping bellows section of the exhaust pipe For the pipe section after 16 (as shown in Fig. 6, it still has a better reinforcement effect), Fig. 1 is a schematic diagram, and the connecting and fixing points are indicated by thick solid lines, so I will not repeat them here.

In this embodiment, the exhaust pipe 3 is provided with a bypass 5, and the bypass connection 5 is connected between the front exhaust pipe section of the supercharging system and the rear exhaust pipe section of the supercharging system. The front refers to the turbine assembly 14 The direction of the intake air, that is, the direction of the exhaust port of the engine; and the bypass 5 is provided with a control valve 4 that controls the opening and closing and opening of the bypass; due to the effect of the exhaust pressure, the turbine assembly Driving the supercharger component will greatly increase the intake pressure. Excessive intake pressure will cause the overall intake to be unstable. Therefore, the control valve is used to control the opening of the bypass, so that part of the exhaust gas is directly discharged through the bypass. After passing through the turbine assembly 14, at the same time, the bypass 5 combined with the exhaust resonant cavity 2 can effectively reduce the volatility of the gas entering the turbine assembly.

In this embodiment, the opening and closing of the control valve 4 and the degree of opening and closing are controlled by the engine intake pressure interlock; the intake pressure interlock is used to control the exhaust gas entering the turbine assembly 14, and the rotation speed of the turbine assembly is directly adjusted to control the intake The air pressure has a direct regulating effect; this kind of interlocking control method and structure has many kinds. The pressure sensor can be used to detect the intake pressure and the opening and closing of the electronic control valve can be used. It can also be controlled by a pneumatic structure. Your existing control technology will not be repeated here; the source of the intake pressure of this interlock control can be after the supercharger or before the supercharger, preferably after the supercharger, because of the The intake pressure is timely and is the pressure after the supercharger is pressurized. The pressure increase and fluctuation are more obvious, which is more conducive to the control of the intake pressure.

In this embodiment, the intake pipe 9 is connected with a pressure control branch line 6, and the pressure control branch line 6 is connected to the control valve 4 for delivering intake pressure to the control valve for controlling the opening and closing of the control valve. Degree; In this structure, the pressure control branch line 6 is used to lead the intake pressure of the intake port, and is connected to the control port of the pneumatic control valve, and the opening and closing of the pneumatic control valve is controlled by the intake pressure, which has the characteristics of directness and thus rapid The use of intake pressure to control the power output of the booster component, and finally control the intake pressure, so as to achieve a closed loop of intake pressure control; the control valve is a pneumatic spring control valve, which uses the intake pressure to control the opening and closing of the control valve, and the pneumatic spring controls The operating principle of the valve is to use the pressure control branch 6 to draw intake air, which directly enters the intake end of the pneumatic spring control valve, and when the set pressure is reached, the intake air compresses the spring of the pneumatic spring control valve, causing the valve core to open , The bypass is opened, so that the exhaust part is directly discharged through the bypass, reducing the drive to the turbine. The principle and control method of the pneumatic spring control valve belong to the existing technology and will not be repeated here. Compared with the electronic control valve, it has Simple structure, low failure rate and low cost.

In this embodiment, the engine is a single-cylinder engine; the volume of the exhaust resonant cavity 2 is 1.5-9 times the engine displacement. The exhaust resonant cavity in this volume range has the characteristics of better elimination of volatility As shown in the figure, for a single-cylinder engine, the engine power can be greatly improved, that is, the present invention is particularly suitable for single-cylinder engines.

In this embodiment, the volume of the intake resonant cavity 10 is greater than 1.5 times the displacement of the engine. The intake resonant cavity 10 of this volume, combined with the exhaust resonant cavity, greatly increases the stability in the near future, and has superposition Engine power improvement effect.

In this embodiment, the volume of the intake resonant cavity 10 is 1.5 times the engine displacement, and the volume of the exhaust resonant cavity 2 is 6 times the engine displacement. The preferred intake and exhaust resonant cavity volumes can be greatly improved. Increasing the engine power has the desired effect of turbocharging, especially for single-cylinder engines, ensuring stable intake while improving engine efficiency; as shown in the figure, in the optimal intake and exhaust cavity volume Under the conditions, the engine power is the highest, and both higher than the optimal power and lower than the optimal power have a certain degree of decline.

In this embodiment, the length of the pipe section 13 of the exhaust pipe 3 between the engine exhaust port and the exhaust resonant cavity is 100-400mm; preferably 300mm. This length range is combined with the volume parameter of the exhaust resonant cavity to facilitate resonance formation. And buffering, so as to help ensure the stability of the exhaust gas entering the turbine assembly, combined with the bypass setting, can more ensure the stability of the exhaust gas, so as to make the supercharging system run smoothly and realize effective control in the near future.

As shown in the figure, the single-cylinder engine with a displacement of 650ml for the test of this embodiment, that is, 0.65L, is connected to a 1L intake resonance cavity, which can effectively increase the power of the engine and continue to increase the volume of the resonance cavity. Instead, the power has a downward trend, as shown in Figure 2, using 0.5L, 1L, 1.5L and 2L intake resonant cavities for comparison, the 1L intake resonant cavity has the best relative effect, and the ratio at this time is about 1.5 times;

The exhaust system is directly added with a turbocharging system, which cannot achieve the supercharging effect. Introducing a certain volume of exhaust resonant cavity before the turbocharger system can greatly increase the engine power, but after the volume reaches 4L, continue to increase the volume, the further increase in engine power is not obvious, 4000m altitude, 2.1 pressure ratio , The 4L volume resonant cavity scheme increases the engine power by 78% compared to the original machine; as shown in Figure 3, the 1L, 2L, 4L and 6L exhaust resonant cavities are used for comparison. The 6L exhaust resonant cavity is compared with the 4L Although the power of the exhaust resonant cavity has increased, the increase is small, but the volume is larger. The comprehensive cost performance is that the 4L exhaust resonant cavity is better, and the 4L exhaust resonant cavity is 6 of the 0.65L engine displacement. About times

The length of the exhaust pipe connecting the exhaust port and the resonance cavity is in the range of 100mm-400mm, and the power gradually increases as the length of the exhaust pipe increases. When the length of the exhaust pipe increases to 400mm, the engine power will have The downward trend, as shown in Figure 4, the exhaust pipe length is 100, 200, 300 and 400mm. 300mm has the highest efficiency. When connected to 400mm, the power drops to a little higher than 100mm. Therefore, the preferred length is 300mm.

After connecting 1L intake resonance cavity, 4L exhaust resonance cavity, and connecting a 300mm exhaust pipe between the exhaust port and the exhaust resonance cavity, the engine power is higher than the original engine at an altitude of 4000m and a pressure ratio of 2.1 85%, see Figure 5.

In Figure 2 to Figure 5, the abscissa is the boost ratio, and the ordinate is the power.

In this embodiment, the pressure control branch 6 is connected to the rear pipe section of the supercharging system (supercharger 12) of the intake pipe 9, which can directly reflect the pressure of the engine intake, thereby realizing effective control and ensuring the smooth operation of the engine. Conducive to improving power and combustion efficiency, and ultimately ensuring engine emissions and reducing energy consumption.

In the present invention, the communication between the exhaust resonant cavity, the intake resonant cavity and the exhaust pipe and the intake pipe can all adopt existing mechanical connection methods, such as welding into one, detachable connection, etc., which will not be repeated here. The supercharging system includes a turbo component, a supercharging component and an intercooler, and the connection and cooperation relationship with the intake and exhaust system also belongs to the prior art, and will not be repeated here.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be implemented Modifications or equivalent replacements without departing from the purpose and scope of the technical solution of the present invention should be covered by the scope of the claims of the present invention.

Claims

An engine with a supercharging system, which is characterized in that it comprises an engine body, an air intake system, an exhaust system, a supercharging system, and a damping bellows section. The supercharging system is connected to the intake air through a corresponding damping bellows section. System and/or exhaust system;

The air intake system includes an air intake pipe, the air intake pipe is provided with an air intake resonance cavity, and the air intake resonance cavity is located between the supercharging system and the engine air inlet.
The engine with a supercharging system according to claim 1, wherein the exhaust system comprises an exhaust pipe connected between the exhaust port of the engine and the muffler, and the damping bellows section is a part of the exhaust pipe. Component, the damping bellows section is located in the pipe section of the exhaust pipe between the supercharging system and the exhaust port of the engine.
The engine with a supercharging system according to claim 2, wherein the exhaust pipe is provided with an exhaust resonant cavity, and the exhaust resonant cavity is located between the exhaust port of the engine and the supercharging system, and is located in the exhaust The gas pipeline is provided with a vibration damping bellows section at the pipe section before or/and the pipe section behind the exhaust resonance cavity.
The engine with a supercharging system according to claim 3, wherein the damping bellows section includes a front damping bellows section located at the pipe section between the engine exhaust port and the exhaust resonance cavity and a front damping bellows section located at the exhaust resonance cavity. The rear damping bellows section of the pipe section between the cavity and the booster system.
The engine with a supercharging system according to claim 3, wherein the axial dynamic stiffness of the damping bellows section is 120-160 N/mm, and the radial dynamic stiffness is 30-40 N/mm.
The engine with a supercharging system according to claim 5, characterized in that: the exhaust resonant cavity is a cylindrical structure, and the wall thickness is not less than 2mm; the exhaust pipe is connected to the exhaust pipe in the radial direction. Gas resonance cavity.
The engine with a supercharging system according to claim 4, characterized in that it further comprises a support reinforcement, said support reinforcement comprising a second pipe section for fixedly supporting the engine exhaust port and the front damping bellows section. A reinforcing member and a second reinforcing member for fixing and supporting the muffler.
The engine with a supercharging system according to claim 3, wherein the exhaust pipe is provided with a bypass, and the bypass is connected to one of the front exhaust pipe section of the supercharging system and the rear exhaust pipe section of the supercharging system And the bypass is provided with a control valve that controls the opening and closing and opening of the bypass; the intake pipe is connected with a pressure control branch, and the pressure control branch is connected to the control valve for delivering the intake pressure to the control The valve is used to control the opening and closing of the control valve and the degree of opening and closing.
The engine with a supercharging system according to claim 8, wherein the engine is a single-cylinder engine; the volume of the exhaust resonant cavity is 1.5-9 times the engine displacement; the intake resonant cavity The volume is greater than 1.5 times the engine displacement;
The engine with a supercharging system according to claim 9, characterized in that the length of the exhaust pipe between the exhaust port of the engine and the exhaust resonance cavity, including the front damping bellows, is 100- 400mm.