阅读说明：本技术 一种具有双增压系统的发动机 (Engine with double boosting systems ) 是由 黄英铭 占文锋 吴广权 段心林 陈良 孙云龙 于 2020-05-21 设计创作，主要内容包括：一种具有双增压系统的发动机,包括空气滤清器、第一增压器、第一水冷中冷器、单向阀、第二增压器、第二水冷中冷器、发动机本体、排气歧管,的空气滤清器通过B管路与第一增压器的第一端连接,排气歧管与第一增压器的第二端连接；第一增压器的第一端还通过第一管路与发动机本体连接,第一水冷中冷器和第二水冷中冷器设于第一管路上；具有双增压系统的发动机还包括设于第一水冷中冷器和第二水冷中冷器之间的第二管路,第二管路的两端与第一管路连接,第二增压器设于第二管路上,单向阀设于第一管路上,且位于第二管路与第一管路的连接点之间。本发明可解决涡轮增压发动机不能同时兼顾低速扭矩与最大功率的问题,同时可避免进气温度过高引起爆震。(An engine with a double-boosting system comprises an air filter, a first supercharger, a first water-cooled intercooler, a one-way valve, a second supercharger, a second water-cooled intercooler, an engine body and an exhaust manifold, wherein the air filter is connected with a first end of the first supercharger through a pipeline B, and the exhaust manifold is connected with a second end of the first supercharger; the first end of the first supercharger is also connected with the engine body through a first pipeline, and the first water-cooled intercooler and the second water-cooled intercooler are arranged on the first pipeline; the engine with the double-booster system further comprises a second pipeline arranged between the first water-cooled intercooler and the second water-cooled intercooler, two ends of the second pipeline are connected with the first pipeline, the second booster is arranged on the second pipeline, the one-way valve is arranged on the first pipeline and located between connection points of the second pipeline and the first pipeline. The invention can solve the problem that the turbocharged engine cannot simultaneously give consideration to low-speed torque and maximum power, and can avoid knocking caused by overhigh air inlet temperature.)

1. The engine with the double boosting systems is characterized by comprising an air filter (1), a first supercharger (2), a first water-cooled intercooler (3), a one-way valve (5), a second supercharger (6), a second water-cooled intercooler (10), an engine body (13) and an exhaust manifold (14);

the air filter (1) is connected with a first end of the first supercharger (2) through a pipeline B, and the exhaust manifold (14) is connected with a second end of the first supercharger (2);

the first end of the first supercharger (2) is also connected with the engine body (13) through a first pipeline, and the first water-cooled intercooler (3) and the second water-cooled intercooler (10) are arranged on the first pipeline;

the engine with two pressure boost systems is still including locating first water-cooled intercooler (3) with second pipeline between second water-cooled intercooler (10), the both ends of second pipeline with first tube coupling, second booster (6) are located on the second pipeline, check valve (5) are located on the first pipeline, and are located the second pipeline with between the tie point of first pipeline.

2. The engine with a dual supercharging system according to claim 1, characterized in that the first supercharger (2) is a turbocharger and the second supercharger (6) is an electric supercharger.

3. The engine with the double pressure boosting system according to claim 1, characterized in that the first pipeline comprises a C pipeline arranged between the first end of the first supercharger (2) and the first water-cooled intercooler (3), a D pipeline arranged between the first water-cooled intercooler (3) and the check valve (5), and a G pipeline arranged between the check valve (5) and the second water-cooled intercooler (10), and the second pipeline comprises an E pipeline connecting the D pipeline and the second supercharger (6), and an F pipeline connecting the second supercharger (6) and the G pipeline.

4. The engine with double boosting system according to claim 3, characterized in that the D and E pipes constitute a first tee pipe (4), the G and F pipes constitute a second tee pipe (8), an included angle α is formed between the D and E pipes of the first tee pipe (4), an included angle β is formed between the G and F pipes of the second tee pipe (8), and both the included angle α and the included angle β are obtuse angles.

5. The engine with dual supercharging system according to claim 3, characterized in that it further comprises a throttle valve (11) and an intake air recirculation valve (9), said throttle valve (11) being disposed between said second water-cooled intercooler (10) and said engine block (13), said intake air recirculation valve (9) being disposed upstream of said throttle valve (11), and said intake air recirculation valve (9) connecting said G line and said B line by a J line.

6. Engine with dual supercharging system according to claim 5, characterized in that the intake-air recirculation valve (9) opens when the throttle valve (11) is closed.

7. The engine with a dual supercharging system according to claim 5, characterized in that the check valve (5) is a mechanical check valve, the intake air recirculation valve (9) is an electric valve, and both the check valve (5) and the intake air recirculation valve (9) are normally closed.

8. The engine with a dual boost system according to claim 1, characterized in that it further comprises a front catalyst (15) and a rear catalyst (16), said front catalyst (15) being connected to the second end of the first supercharger (2) by a K-line and said rear catalyst (16) being connected to said front catalyst (15) by an L-line.

9. Engine with dual supercharging system according to claim 2, characterized in that the first water-cooled charge air cooler (3), the second water-cooled charge air cooler (10) and the second supercharger (6) each have a cooling system which is independent of the engine block.

10. The engine with double boosting system according to claim 2, further comprising a power source (7), wherein the power source (7) is connected with the second booster (6) and is used for supplying power to the second booster (6) and can accept energy recovery when the whole vehicle runs.

Technical Field

The invention relates to the technical field of automobile engines, in particular to an engine with a double-supercharging system.

Background

Turbo-charged engines suffer from turbo lag during rapid acceleration and it is difficult for a single first supercharger to compromise between low speed torque and high speed power, only in a compromise. The dual boost technique allows the first supercharger to have a greater compromise of high speed torque and power, while low speed torque and rapid acceleration response are compensated for by the second supercharger.

The prior art has the following defects:

1. a double-supercharging air inlet system is characterized in that a second supercharger is arranged at the upstream of a first supercharger, the first supercharger is arranged between the second supercharger and an air inlet manifold, and the function of quickly building the supercharging pressure cannot be realized due to the fact that the build-up of the supercharging pressure is hindered by the hysteresis effect of a turbine.

2. In another engine with a low-pressure EGR system and a control method thereof, a second supercharger is arranged behind a charge air cooler, and the temperature of an intake manifold is increased after the second supercharger works, so that combustion knock is easily caused, and the performance of the engine is limited.

3. In addition, in a low-pressure EGR system of a vehicle engine, the low-pressure EGR system is used in combination with a dual supercharger, and the low-pressure EGR system fails to provide a required EGR amount in time under a rapid acceleration condition in which a second supercharger operates, resulting in deterioration of combustion.

In summary, there is a need for an engine with dual supercharging systems that can solve the acceleration response problem of a turbocharged engine and the problem that both low-speed torque and high power cannot be considered, and can avoid the problems of too high intake temperature and large knocking tendency.

The foregoing description is provided for general background information and is not admitted to be prior art.

Disclosure of Invention

The invention aims to provide an engine with a double-supercharging system.

The invention provides an engine with a double-supercharging system, which comprises an air filter, a first supercharger, a first water-cooled intercooler, a one-way valve, a second supercharger, a second water-cooled intercooler, an engine body and an exhaust manifold, wherein the air filter is connected with a first end of the first supercharger through a pipeline B, and the exhaust manifold is connected with a second end of the first supercharger; the first end of the first supercharger is further connected with the engine body through a first pipeline, and the first water-cooled intercooler and the second water-cooled intercooler are arranged on the first pipeline; the engine with two pressure boost systems is still including locating first water-cooling intercooler with second pipeline between the second water-cooling intercooler, the both ends of second pipeline with first tube coupling, the second booster is located on the second pipeline, the check valve is located on the first pipeline, and be located the second pipeline with between the tie point of first pipeline.

Further, the first supercharger is a turbocharger, and the second supercharger is an electric supercharger.

Further, first pipeline including locate first booster first end with C pipeline between the first water-cooling intercooler, locate first water-cooling intercooler with D pipeline between the check valve and locate the check valve with G pipeline between the second water-cooling intercooler, the second pipeline is including connecting the D pipeline with the E pipeline of second booster and connection the second booster with the F pipeline of G pipeline.

Furthermore, the pipeline D and the pipeline E form a first three-way pipe, the pipeline G and the pipeline F form a second three-way pipe, an included angle alpha is formed between the pipeline D and the pipeline E of the first three-way pipe, an included angle beta is formed between the pipeline G and the pipeline F of the second three-way pipe, and the included angle alpha and the included angle beta are obtuse angles.

Further, the engine with the double-supercharging system further comprises a throttle valve and an air inlet recirculation valve, the throttle valve is arranged between the second water-cooled intercooler and the engine body, the air inlet recirculation valve is arranged on the upstream of the throttle valve, and the air inlet recirculation valve is connected with the G pipeline and the B pipeline through a J pipeline.

Further, the intake air recirculation valve opens when the throttle is closed.

Further, the check valve is a mechanical check valve, the air inlet recirculation valve is an electric valve, and the check valve and the air inlet recirculation valve are both normally closed.

Further, the engine with the double-supercharging system further comprises a front catalyst and a rear catalyst, the front catalyst is connected with the second end of the first supercharger through a K pipeline, and the rear catalyst is connected with the front catalyst through an L pipeline.

Further, the first water-cooled intercooler, the second water-cooled intercooler and the second supercharger are all provided with cooling systems independent of the engine body.

Further, the engine with the double-booster system further comprises a power supply, wherein the power supply is connected with the second booster and is used for supplying power to the second booster and receiving energy recovery during the operation of the whole vehicle.

According to the engine with the double-supercharging system, when the performances are matched, the first supercharger selects a larger wheel system and is close to the high-speed and high-power direction to realize higher power, and the torque of the low-speed section is supplemented by the second supercharger, so that the low-speed torque platform of the engine is widened finally, and meanwhile, the higher power, the wider torque output platform and the higher power are realized; the two water-cooling intercooling systems not only reduce the air inlet temperature of the electric supercharger, but also effectively reduce the air inlet temperature finally entering the combustion chamber of the engine, and avoid combustion knocking.

Drawings

FIG. 1 is a schematic diagram of a system architecture for an engine having a dual supercharging system.

The reference numerals and components referred to in the drawings are as follows:

1. air filter

2. First booster

3. First water-cooled intercooler

4. First three-way pipe

5. One-way valve

6. Second booster

7. Power supply

8. Second three-way pipe

9. Intake air recirculation valve

10. Second water-cooled intercooler

11. Air throttle

12. Air intake manifold

13. Engine body

14. Exhaust manifold

15. Front catalyst

16. Rear catalytic converter

Detailed Description

The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.

The terms first, second, third, fourth and the like in the description and in the claims of the present invention are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.

First embodiment

Referring to fig. 1, fig. 1 is a schematic system architecture diagram of an engine with a dual supercharging system according to the present embodiment. The engine with the double-supercharging system comprises an air filter 1, a first supercharger 2, a first water-cooled intercooler 3, a first three-way pipe 4, a one-way valve 5, a second supercharger 6, a power supply 7, a second three-way pipe 8, an air inlet recirculation valve 9, a second water-cooled intercooler 10, a throttle valve 11, an air inlet manifold 12, an engine body 13, an exhaust manifold 14, a front catalyst 15 and a rear catalyst 16.

One end of the air filter 1 is connected with a pipeline A, and the other end of the air filter is connected with a pipeline B; one end of the pipeline B is connected with the air filter 1, and the other end of the pipeline B is connected with the first end of the first supercharger 2; the first end of the first supercharger 2 is also connected with a first water-cooled intercooler 3 through a pipeline C; one end of the first water-cooled intercooler 3 is connected with the pipeline C, and the other end of the first water-cooled intercooler is connected with the first three-way pipe 4;

the first three-way pipe 4 is provided with a pipeline D and a pipeline E, and the included angle alpha of the two pipelines is an obtuse angle so as to reduce the flow loss. The D pipeline on the first three-way pipe 4 is connected with a one-way valve 5, one end of the E pipeline of the first three-way pipe 4 is connected with a second supercharger 6, and the other end of the E pipeline of the first three-way pipe 4 is connected with the D pipeline; the second three-way pipe 8 is provided with a G pipeline and an F pipeline, and the included angle beta of the two pipelines is an obtuse angle so as to reduce the flow loss. One end of a G pipeline of the second three-way pipe 8 is connected with the one-way valve 5, and the other end of the G pipeline is connected with a second water-cooled intercooler 10; one end of the F pipeline of the second three-way pipe 8 is connected with the second supercharger 6, and the other end of the F pipeline is connected with the G pipeline; the second booster 6 is connected with a power supply 7 through a lead;

the G pipeline is connected with an I pipeline, one end of the I pipeline is connected with the G pipeline, and the other end of the I pipeline is connected with an air inlet recirculation valve 9; one end of the J pipeline is connected with the air inlet recirculation valve 9, and the other end of the J pipeline is connected with the B pipeline;

one end of the second water-cooled intercooler 10 is connected with the G pipeline, and the other end of the second water-cooled intercooler is connected with the H pipeline; a throttle valve 11 is connected to the pipeline H, and the throttle valve 11 is connected with an intake manifold 12; the intake manifold 12 is connected with an engine body 13, one end of the engine body 13 is connected with the intake manifold 12, and the other end of the engine body 13 is connected with an exhaust manifold 14; the outlet of the exhaust manifold 14 is connected to the second end of the first supercharger 2;

the vortex end of the first supercharger 2 is also connected with a K pipeline, and the K pipeline is connected with a front catalyst 15; one end of the front catalyst 15 is connected with the K pipeline, the other end of the front catalyst is connected with an L pipeline, and the L pipeline is connected with a rear catalyst 16; one end of the rear catalyst 16 is connected with an L pipeline, and the other end is connected with an M pipeline.

Through the connection mode, the air filter 1 is connected with the engine body through a first pipeline, the second supercharger 6 is connected with the first pipeline in parallel through a second pipeline, and the first pipeline is connected with the first supercharger through a third pipeline.

It should be noted that:

the check valve 5 of the present invention is preferably a mechanical check valve, the intake air recirculation valve 9 is preferably an electric valve, and both the check valve 5 and the intake air recirculation valve 9 are normally closed. First booster 2 is turbo charger, and second booster 6 is electric supercharger, second booster 6 include motor and pinch roller. The first water-cooled intercooler 3, the second water-cooled intercooler 10 and the second supercharger 6 are all provided with cooling systems independent of the engine body. The voltage of the power supply 7 is 48V, and the power supply is used for supplying power to the second booster 6; the power supply 7 can also receive energy recovery when the whole vehicle runs so as to continuously maintain the electric quantity required by the second booster 6.

The engine with the double pressure increasing system works as follows:

as shown in fig. 1, in operation, fresh air is sucked from the pipeline a, passes through the air filter 1, then enters the pressure end of the first supercharger 2 through the pipeline B, and is compressed to do work along with the high-speed rotation of the pressure wheel of the first supercharger 2, so that the air density and temperature rise; the compressed fresh gas enters a first water-cooled intercooler 3 through a pipeline C for cooling and then reaches a first three-way pipe 4; the fresh gas directly passes through the pipeline D and then flows to the pipeline G through the one-way valve 5; or after passing through the front half section of the pipeline D, the gas flows through the pipeline E and enters the second supercharger 6 for secondary supercharging, and the gas after secondary supercharging flows back to the pipeline G through the pipeline F; the gas flows into the second water-cooled intercooler 10 from the pipeline G and is further cooled, and after reaching a proper temperature, the gas enters the intake manifold 12 through the throttle valve 11 and then enters the engine body 13 to perform combustion work, so that waste gas is generated. The combustion exhaust gas is discharged from the engine body 13, passes through the exhaust manifold 14, and then pushes the turbine to do work at the turbine end of the first supercharger 2. After doing work, the exhaust gas is discharged from the K line, and is discharged through the front catalyst 15, the rear catalyst 16, and the M line in this order.

It should be noted that:

1) under the ordinary working condition, the second supercharger 6 is in the idling state, does not apply work to intake air for supercharging, only the first supercharger 2 supercharges fresh air at the moment, and the supercharged air directly enters the G pipeline and subsequent pipelines by pushing the one-way valve 5 open through the D pipeline.

2) When rapid acceleration or low-speed large torque is required, the rotating speed of the second supercharger 6 is rapidly increased under the action of the 48V power supply 7, and secondary supercharging is carried out on intake air so as to provide higher and faster high-pressure gas, promote more fresh gas to enter a combustion chamber of the engine body 13 for combustion, output more torque outwards and improve the responsiveness of the engine. When the second supercharger 6 works, the pressure of the pipeline G is larger than that of the pipeline D, the one-way valve 5 is closed under the action of pressure difference, and air enters the pipeline G from the pipeline D, flows to the pipeline E, enters the second supercharger 6 and then flows to the pipeline G from the pipeline F.

The first water-cooled intercooler 3 functions to lower the temperature of the air after the first supercharger 2 and ensure that the temperature of the air entering the second supercharger 6 is at an ideal level, thereby ensuring that the second supercharger 6 can operate continuously and efficiently. Excessive temperatures not only limit the operational time of the second supercharger 6, but also reduce the efficiency of its compressor.

The second water-cooled intercooler 10 is used for cooling the gas after the second supercharger 6 or secondarily cooling the intake air, so that the intake air temperature is ensured to be at a lower level, the actual air density is increased, the power capability of the engine is further ensured, and meanwhile, the engine is prevented from knocking.

Therefore, the existence of two water-cooling intercooler compares with an independent intercooler scheme, and two water-cooling intercooler can choose for use less model, arrange relatively more nimble to reduce the problem of arranging the difficulty because of the production of a big water-cooling intercooler.

The second supercharger 6 is externally connected with independent cooling water to ensure that the second supercharger 6 can continuously and efficiently operate. The check valve 5 does not need to be controlled by the ECU, and the ECU only needs to control the second supercharger 6 to realize the pressure difference at the two ends of the check valve, so that the valve switch is controlled.

The function of the air inlet recirculation valve 9 is that when the engine normally runs, the accelerator is suddenly released, and the throttle valve 11 is suddenly closed, the air inlet recirculation valve 9 is opened, high-pressure air in the pipeline G is led back to the pipeline B and then enters the vortex-end supercharger 2 to form a circulation, so that the second water-cooled intercooler 10 and other parts are prevented from being damaged due to overlarge pressure, meanwhile, the turbine can be maintained to continuously run, huge rotation speed fluctuation is not generated, and preparation is made for next power output.

Based on the above description, the present invention has the following advantages:

1. the engine has a wider torque output platform and larger power, the responsiveness of the engine is obviously improved, and the driving pleasure of the automobile is increased; meanwhile, the system is safe and reliable.

2. The invention solves the problem of acceleration response of the turbocharged engine, solves the problem that low-speed torque and high power cannot be simultaneously considered, and simultaneously avoids the problems of overhigh air inlet temperature and large knocking tendency.

3. Broadening low speed torque and high speed power: by adopting the double-booster system, when the performances are matched, the first booster adopts a larger wheel system to approach the first booster in the high-speed and high-power direction so as to realize higher power, and the torque of the low-speed section is supplemented by the second booster; finally, the low-speed torque platform of the engine is widened, and meanwhile, higher power is achieved.

4. The engine has the advantages that the turbo lag phenomenon is avoided, the acceleration response of the engine is improved, the electric supercharger can make up the phenomenon that the rotating speed of the first supercharger is delayed due to the insufficient exhaust energy, the energy of a 48V power supply is rapidly converted into the kinetic energy of the electric compressor, air is further compressed, the air inlet density and the air inlet amount of the engine are increased, and therefore the engine can burn more fuel oil and achieve faster torque output.

5. The two water-cooling intercooling systems not only reduce the air inlet temperature of the electric supercharger, but also effectively reduce the air inlet temperature finally entering the combustion chamber of the engine, and avoid combustion knocking.

6. The air inlet supercharging system adopts the water-cooling inter-cooling system fixed on the engine, removes the traditional air-air cooling system, greatly reduces the length of an air inlet pipeline after supercharging, and has obvious effect on improving the responsiveness of the engine.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.