Intelligent adjustable electric auxiliary turbocharging system and control method thereof

Abstract

The invention aims to provide an intelligent adjustable electric auxiliary turbocharging system and a control method thereof, belongs to the field of engines, realizes optimal matching of an intake and exhaust system of a diesel engine through intelligent control of each adjustable part, improves the economical efficiency and low working condition performance of the whole machine, solves the problems of narrow high-efficiency area of a gas compressor, low turbine efficiency and the like, and improves the working efficiency of the diesel engine. The requirements under different working conditions are met, and the working efficiency and stability of the engine are optimized under the working conditions of variable rotating speed and variable load. The specific adjusting strategy comprises the step of adjusting the angles of an inlet guide blade, a diffuser blade and a turbine stationary blade according to the operation working condition of the diesel engine, so that the performance of the diesel engine and the fuel economy are improved. By jointly adjusting the three adjustable parts, the performance of the turbocharger can be remarkably improved, the overall performance of the diesel engine is improved, and the efficient operation range of the diesel engine is effectively widened.

Description

Technical Field

[0001] The present invention relates to an engine and a control method thereof, in particular to an intake and exhaust system and a control method thereof. Background Art

[0002] Turbocharging technology is a technical means to improve the efficiency and output power of diesel engines. It improves the combustion efficiency and output power of diesel engines by feeding more air (and therefore more fuel) into the diesel engine than in the naturally aspirated state. With the continuous improvement of the performance requirements of internal combustion engines, especially diesel engines, traditional supercharging technology can no longer meet the needs of modern diesel engines to operate efficiently under different working conditions. Variable geometry supercharging and electrically assisted turbocharging technology have gradually become research hotspots. As an emerging technology, electrically assisted turbocharging technology can perfectly solve the turbo hysteresis problem existing in traditional turbocharging technology, and can recycle the excess exhaust energy when the engine is in high working conditions, so that the fuel economy of diesel engines is improved. At present, the research on electrically assisted turbocharging technology mainly focuses on improving the performance of diesel engines and the design of electrically assisted supercharging systems. Variable geometry supercharging technology achieves precise control of the engine intake pressure by adjusting the variable mechanism of the turbine. Variable geometry supercharging technology includes the adjustable design of three adjustable components: inlet guide vanes, diffuser blades and turbine stators.

[0003] Zhou and Fiorentini proposed a control design for the gas circuit system of a diesel engine equipped with an exhaust gas recirculation (EGR), a variable geometry turbine (VGT) and a variable geometry compressor (VGC) system, and studied the steady-state and dynamic responses of the gas circuit system to understand the impact of VGC combined with VGT-EGR actuator on system performance. Most researchers at home and abroad have limited the joint operation of multiple adjustable components of the turbocharger to the joint operation of two adjustable components, such as the joint operation of adjustable inlet guide vanes and adjustable vane diffusers, and the joint operation of variable geometry turbines and adjustable vane diffusers. There are few studies on the joint operation of three adjustable components, and there is no in-depth discussion and research on whether the joint operation of the three adjustable components has a positive effect on improving the performance of the electric-assisted turbocharger and whether it can help improve the performance of the diesel engine. Summary of the invention

[0004] The purpose of the present invention is to provide an intelligent adjustable electrically-assisted turbocharger system and a control method thereof that can achieve optimized matching of the intake and exhaust systems of a diesel engine, improve the economy and low-operating performance of the entire machine, solve the problems of a narrow compressor high-efficiency zone and low turbine efficiency, meet the needs under different operating conditions, and optimize the working efficiency and stability of the engine under different operating conditions, especially under variable speed and variable load conditions, to provide higher flexibility and economy.

[0005] The object of the present invention is achieved in that:

[0006] The intelligent adjustable electrically assisted turbocharger system of the present invention is characterized in that it includes an engine, a basic turbine, a basic compressor, a controlled turbine, and a controlled compressor. The basic turbine is coaxial with the basic compressor, the controlled turbine is connected to the controlled compressor through a turbine shaft, a motor is installed on the turbine shaft, an adjustable inlet guide vane is installed at the inlet of the controlled compressor, an adjustable blade diffuser is installed at the outlet of the controlled compressor, the controlled turbine is provided with adjustable stator blades, the outlets of the basic compressor and the controlled compressor are connected to an intercooler after merging, the intercooler is connected to an intake manifold through an intake pipe, the intake manifold is connected to the engine, the inlets of the basic turbine and the controlled turbine are connected to an exhaust pipe after merging, and the exhaust pipe is connected to the engine through the exhaust manifold.

[0007] The intelligent adjustable electrically assisted turbocharging system of the present invention may further include:

[0008] 1. The adjustment of the adjustable stator blades of the controlled turbine includes 0°, 1° and 2°; the adjustment of the adjustable inlet guide vanes includes 0°, negative rotation 5°, positive rotation 10° and positive rotation 25°; the adjustment of the adjustable blade diffuser includes 0°, rotation 2° in the direction of reducing the flow area, and rotation 2° in the direction of increasing the flow area.

[0009] 2. It also includes an EGR system, the outlet and inlet of the EGR system are connected to the intake pipe and the exhaust pipe respectively, and an EGR valve is installed at the outlet of the EGR system.

[0010] 3. An air valve is installed at the outlet of the basic compressor and a gas valve is installed at the inlet of the basic turbine.

[0011] The control method of the intelligent adjustable electric assisted turbocharging system of the present invention is characterized by: using the above intelligent adjustable electric assisted turbocharging system:

[0012] (1) Run the engine, check and calibrate all sensors, obtain initial data, including ambient temperature, pressure, and initial state data of the engine, and put it into normal operating state;

[0013] (2) Initializing the angles of the adjustable components, and setting the angles of the adjustable inlet guide vanes, the adjustable vane diffuser, and the adjustable stator blades of the turbine control unit to the initial set values;

[0014] (3) Obtain the current operating condition of the engine, obtain the current operating condition data of the engine in real time, and analyze and determine the specific type of the current operating condition;

[0015] (4) Selecting an adjustment strategy according to the operating conditions, adjusting the motor mode and power according to the current load condition and the corresponding optimized supercharging strategy under 10 operating conditions, selecting the corresponding inlet guide vane angle, diffuser blade angle and turbine stator blade angle, and determining the supercharger operation mode;

[0016] (5) Adjust the adjustable components, adjust the motor mode to make it in generator mode or motor mode, adjust the motor power, adjust the adjustable inlet guide vanes, adjustable vane diffuser and adjustable stator blade angle of the turbine, and determine whether to switch the supercharger operation mode or maintain the original supercharger operation mode;

[0017] (6) Monitor engine performance parameters, including engine power, fuel consumption, turbine inlet temperature, maximum combustion pressure, compressor surge margin, and compressor efficiency, and compare these performance parameters with optimization targets;

[0018] (7) If the performance parameter does not reach the optimization target, readjust the angle of the adjustable component and repeat step (3); if the performance parameter reaches the optimization target, keep the current setting;

[0019] (8) Continuous monitoring and adjustment: Continuously monitor the engine operating status and performance parameters, and make real-time adjustments to cope with changes in different operating conditions.

[0020] The control method of the intelligent adjustable electrically assisted turbocharging system of the present invention may further include:

[0021] 1. The 10 working conditions are respectively 10% working condition, 20% working condition, 30% working condition, 40% working condition, 50% working condition, 60% working condition, 70% working condition, 80% working condition, 90% working condition and 100% working condition.

[0022] 2. The specific control methods for the 10 working conditions are:

[0023] 10% working condition: adjust the inlet guide vane angle to 10°, the diffuser blade angle to -2°, the turbine stator blade angle to 2°, and adjust the motor power to 100%, so that the diesel engine runs in 1TC mode;

[0024] 20% working condition: adjust the inlet guide vane angle to -5°, the diffuser blade angle to -2°, the turbine stator blade angle to 1°, adjust the motor power to 80%, and maintain 1TC mode operation;

[0025] 30% working condition: adjust the inlet guide vane angle to 0°, the diffuser blade angle to -2°, the turbine stator blade angle to 0°, maintain the motor power unchanged, and keep running in 1TC mode;

[0026] 40% working condition: adjust the inlet guide vane angle to -5°, the diffuser blade angle to -2°, the turbine stator blade angle to 0°, maintain the motor power unchanged, and keep running in 1TC mode;

[0027] 50% working condition: adjust the inlet guide vane angle to 25°, the diffuser blade angle to 2°, the turbine stator blade angle to 1°, adjust the motor power to 20%, and switch to 2TC mode;

[0028] 60% working condition: adjust the inlet guide vane angle to 10°, the diffuser blade angle to 0°, the turbine stator blade angle to 2°, adjust the motor power to 0, and maintain 2TC mode operation;

[0029] 70% working condition: adjust the inlet guide vane angle to 10°, the diffuser blade angle to 0°, the turbine stator blade angle to 1°, maintain the motor power unchanged, and keep running in 2TC mode;

[0030] 80% working condition: adjust the inlet guide vane angle to 0°, the diffuser blade angle to -2°, the turbine stator blade angle to 1°, and maintain 2TC mode operation;

[0031] 90% working condition: adjust the inlet guide vane angle to 0°, the diffuser blade angle to -2°, the turbine stator blade angle to 0°, and maintain 2TC mode operation;

[0032] 100% operating condition: adjust the inlet guide vane angle to -5°, the diffuser blade angle to 0°, the turbine stator blade angle to 0°, and maintain 2TC mode operation.

[0033] The advantages of the present invention are as follows: by adjusting the angle of the inlet guide vane, the present invention can change the flow characteristics and the compression ratio of the compressor, thereby improving the stability and efficiency of the compressor. By adjusting the angle of the diffuser blades, the flow and efficiency characteristics of the compressor can be controlled, especially when running at high speeds. The variable geometry design of the turbine achieves fine control of the turbine flow and efficiency by adjusting the angle of the stator blades. By jointly adjusting the three adjustable components, the performance of the turbocharger can be significantly improved, the overall performance of the diesel engine can be improved, and the efficient operation range of the diesel engine can be effectively widened. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a structural schematic diagram of the present invention;

[0035] Figure 2a This is the three-dimensional structure diagram of the inlet guide vane adjustment (IGV-5°). Figure 2b This is the three-dimensional structure diagram of the inlet guide vane adjustment (IGV0°). Figure 2c 3D structure diagram of inlet guide vane adjustment (IGV10°), Figure 2d 3D structure diagram of inlet guide vane adjustment (IGV25°);

[0036] Figure 3a 3D diagram of diffuser blade adjustment (VGC-2°), Figure 3b The three-dimensional structure diagram of the diffuser blade adjustment (VGC0°) is shown below. Figure 3c Adjust the three-dimensional structure diagram of the diffuser blades (VGC2°);

[0037] Figure 4a The three-dimensional structure diagram of the variable geometry turbine stator blade adjustment (closed to 0°). Figure 4b The three-dimensional structure diagram of the variable geometry turbine stator blade adjustment (closed 1°). Figure 4c 3D diagram of variable geometry turbine stator blade adjustment (closed 2°);

[0038] Figure 5 Flowchart of adjustment strategy for each working condition;

[0039] Figure 6 This is a flow chart of the control method of the present invention.

[0040] Reference numerals in the figure: adjustable inlet guide vane 1, controlled supercharger compressor 2, adjustable blade diffuser 3, motor 4, turbocharger rotating shaft 5, controlled supercharger variable geometry turbine 6, inverter 7, battery 8, intercooler 9, intake pipe 10, intake manifold 11, engine 12, exhaust manifold 13, exhaust pipe 14, EGR valve 15, EGR system 16, air valve 17, gas valve 18. DETAILED DESCRIPTION

[0041] The present invention is described in more detail below with reference to the accompanying drawings:

[0042] Combination Figure 1-6 The present invention discloses an intelligent adjustable electrically assisted turbocharging system, comprising an adjustable inlet guide vane 1, a controlled turbocharger compressor 2, an adjustable blade diffuser 3, a motor 4, a turbocharger rotating shaft 5, a controlled turbocharger variable geometry turbine 6, an inverter 7, a battery 8, an intercooler 9, an intake pipe 10, an intake manifold 11, an engine 12, an exhaust manifold 13, an exhaust pipe 14, an air valve 17, a gas valve 18, and an exhaust gas recirculation (EGR) system. The exhaust gas recirculation (EGR) system comprises an EGR valve 15 and an EGR system 16. The motor 4 assists the operation of the turbine to achieve precise control of the intake pressure.

[0043] The adjustable inlet guide vane 1 adjustment angle is set to 0°, that is, the inlet guide vane does not rotate; negative rotation 5°, recorded as IGV-5°; positive rotation 10°, recorded as IGV10°; and positive rotation 25°, recorded as IGV25°. For the diffuser blades, the initial blade installation angle of the compressor diffuser 3 is recorded as VGC0°. The compressor flow and compression ratio can be adjusted by adjusting the positive or negative rotation.

[0044] The adjustable blade diffuser 3 is a three-stage adjustable diffuser blade. The initial blade installation angle of the compressor diffuser 3 is recorded as VGC0°. Thereafter, the diffuser blade installation angle is rotated 2° in the direction of reducing the flow area, recorded as VGC2°, and rotated 2° in the direction of increasing the flow area, recorded as VGC-2°. By adjusting the blade angle, the compressor flow rate is controlled and the efficiency is improved.

[0045] The exhaust gas recirculation (EGR) system controls the opening of the EGR valve to adjust the amount of exhaust gas recirculation and reduce nitrogen oxide emissions.

[0046] The variable geometry turbine uses adjustable stator blades to control the turbine exhaust flow, that is, the stator blades are rotated along a fixed axis, and the turbine flow and efficiency are controlled by adjusting the angle of the turbine stator blades.

[0047] The electrically assisted turbocharging system includes an electric motor module coupled to the turbocharger shaft, and a generator module for providing additional boost and energy recovery.

[0048] By integrating an electrically assisted turbocharger system, sequential supercharging, adjustable inlet guide vanes, adjustable vane diffuser, exhaust gas recirculation (EGR) and a variable geometry turbine, the diesel engine intake and exhaust systems are optimized, the matching efficiency and operating stability of the diesel engine are improved, the fuel consumption rate is reduced, and the safe, efficient and stable operating range of the diesel engine is expanded, thereby improving the economy of the entire engine and low-operating performance.

[0049] Figure 1The intelligent adjustable electrically assisted turbocharger system of the present invention includes a controlled supercharger compressor 2, an adjustable inlet guide vane 1, an adjustable blade diffuser 3, a motor 4, a variable geometry turbine 6 and an exhaust gas recirculation system 16. One end of the electrically assisted turbocharger 1 is installed at the inlet end of the air inlet 10, and the other end is installed at the outlet end of the exhaust 14. The electrically assisted motor 4 is installed on the turbine shaft 5, and provides additional driving force through the motor-assisted turbine operation to achieve precise control of the intake pressure and improve the turbine response speed and efficiency. The compressor end includes an adjustable design for the inlet guide vane and the diffuser blade. The inlet guide vane installed at the compressor inlet is driven by an electric motor to adjust the rotation angle of the inlet guide vane, and the compressor flow and compression ratio are adjusted by positive or negative rotation. The adjustable blade diffuser is installed at the compressor outlet and can adjust the blade angle by driving an electric motor to control the compressor flow and improve efficiency. At the turbine end, only the stator blades are designed to be adjustable. The angle of the turbine stator blades can be adjusted by the motor drive, and the turbine flow and efficiency can be controlled by adjusting the angle of the turbine stator blades. The exhaust gas recirculation (EGR) system includes an EGR valve 15, an EGR cooler and an EGR pump. By controlling the opening of the EGR valve, the exhaust gas recirculation volume is adjusted, the intake temperature and oxygen concentration of the diesel engine are adjusted, and part of the exhaust gas is recirculated to the intake system to reduce nitrogen oxide emissions and improve combustion efficiency. The joint operation of these three adjustable components will significantly improve the performance of the turbocharger and improve the overall performance of the diesel engine, so as to obtain the optimized supercharging strategy corresponding to the diesel engine under the propulsion characteristic working conditions, and broaden the safe, efficient and stable operation range of the diesel engine.

[0050] For a marine 16-cylinder diesel engine model with the intelligent adjustable electric-assisted turbocharger system, the diesel engine performance was studied by adjusting the inlet guide vane angle, diffuser blade angle and turbine stator blade angle. The rotation axis of the inlet guide vane is the center of gravity in the length direction of the blade. Figure 2 shows the adjustable rotation angle of the inlet guide vane. Different inlet guide vane rotation angles will affect the fuel consumption rate of the diesel engine. Under low working conditions, a large positive rotation angle can effectively reduce the fuel consumption rate; under medium and low working conditions, the rotation angle should be reduced; under high working conditions, negative rotation can further reduce the fuel consumption rate. This shows that the adjustment of the inlet guide vane can effectively reduce the fuel consumption rate under different working conditions. The rotation angle of the inlet guide vane will also affect the diesel engine turbine front temperature. Adjustment of different angles can optimize the turbine front temperature and improve engine efficiency. Adjusting the inlet guide vane angle has a significant effect on the compressor performance. The positive and negative rotation adjustment of the inlet guide vane can adjust the flow rate and pressure ratio of the compressor, and at the same time affect the efficiency and flow characteristics of the compressor. By changing the rotation direction of the inlet guide vanes, it can adapt to different working conditions and requirements.

[0051] The rotation axis of the diffuser blade is the leading edge of the blade. Combined with Figure 3, the rotation angle of the adjustable diffuser blade is determined. Adjusting the diffuser blade angle is an effective means to control the compressor flow and improve efficiency, especially when running at high speed. By adjusting the angle of the diffuser blade, the flow range and efficiency characteristics of the compressor can be changed. Adjusting the diffuser blade angle will also affect the fuel consumption rate. Negative rotation can reduce the fuel consumption rate of diesel engines. Different rotation angles of the diffuser blade will affect the surge margin of the compressor. Positive rotation can increase the compressor surge margin under low operating conditions and expand the safe operating range of the compressor.

[0052] As shown in Figure 4, there are three levels of adjustment for the turbine stator blades in the intelligent adjustable electric-assisted turbocharger system, which are 0°, 1°, and 2°. The study was conducted in 1TC and 2TC operating modes according to the propulsion characteristics of the diesel engine. As the stator blades are gradually closed, the turbine flow rate decreases significantly, and the flow rate decrease amplitude has a nonlinear relationship with the turbine closing angle. Closing the stator blade angle can significantly reduce fuel consumption under medium and low working conditions, while keeping it unchanged under high working conditions to optimize the fuel consumption rate. Under different operating modes, the adjustment of the stator blade angle has different effects on the compressor efficiency. Under the 1TC mode, closing the stator blade angle can improve the compressor efficiency. Under the 2TC mode, closing the stator blade angle can move the highest efficiency point toward the low working condition. Different stator blade angles corresponding to different working conditions can effectively reduce the fuel consumption of the diesel engine.

[0053] According to the propulsion characteristics, the model of a 16-cylinder marine diesel engine with the intelligent adjustable electric-assisted turbocharger system is kept constant in the injection rack position of the corresponding working condition (i.e., the injection amount of the corresponding working condition is kept constant). The switching points are determined according to the optimal fuel consumption strategy, and the engine is operated in 1TC mode and 2TC mode respectively. The rotation of the diffuser blade has no obvious effect on the switching point between the 1TC and 2TC modes of the diesel engine. The change of the switching point is mainly affected by the turbine angle. As the turbine angle is reduced, the switching point moves toward the low-load working condition. Secondly, the switching point between the 1TC and 2TC modes of the diesel engine is also affected by the inlet guide vane angle. When the inlet guide vane rotation angle is less than 10°, the switching point has no effect. When the inlet guide vane rotation angle is greater than 10°, the switching point is consistent with the turbine angle reduction law, and it moves toward the low-load working point. The reduction of the turbine angle and the positive rotation of the inlet guide vane reduce the fluidity of the turbocharger, improve the low-condition intake of the diesel engine, and reduce fuel consumption.

[0054] When studying the adjustment strategy of the intelligent adjustable electric-assisted turbocharger system, the three adjustable components are jointly adjusted, and the results of the different angle changes of the three adjustable components on the engine fuel consumption, exhaust temperature and maximum combustion pressure are calculated. The adjustment strategy is formulated with the primary goal of improving the power and economy of the diesel engine, and the secondary goals of improving the compressor surge margin, reducing the temperature before the turbine and the maximum combustion pressure. Under low operating conditions (10%-30%), the load of the diesel engine is low, and the adjustment motor is in the electric motor mode. It can quickly and efficiently accelerate the supercharger rotor, so that the centrifugal compressor can instantly increase the speed to provide high-pressure and large-flow fresh air, improve the torque, fuel consumption, smoke density and other performance parameters of the diesel engine under low operating conditions, and it is necessary to improve fuel efficiency and compressor efficiency and reduce the temperature before the turbine by properly adjusting each component. The specific adjustment strategy is as follows, and the process is attached Figure 5 illustrate:

[0055] 10% operating condition: adjust the inlet guide vane angle to 10°, the diffuser blade angle to -2°, the turbine stator angle to 2°, adjust the motor power to 100%, and make the diesel engine operate in 1TC mode; 20% operating condition: adjust the inlet guide vane angle to -5°, the diffuser blade angle to -2°, the turbine stator angle to 1°, adjust the motor power to 80%, and keep operating in 1TC mode; 30% operating condition: adjust the inlet guide vane angle to 0°, the diffuser blade angle to -2°, the turbine stator angle to 0°, maintain the motor power unchanged, and keep operating in 1TC mode.

[0056] In the medium working condition (40%-70%), the diesel engine load gradually increases, and the motor is still in the motor mode. It is necessary to adjust the components appropriately to further optimize fuel consumption and compressor efficiency. The specific adjustment strategy is as follows:

[0057] 40% operating condition: adjust the inlet guide vane angle to -5°, the diffuser blade angle to -2°, the turbine stator angle to 0°, maintain the motor power unchanged, and maintain 1TC mode operation; 50% operating condition: adjust the inlet guide vane angle to 25°, the diffuser blade angle to 2°, the turbine stator angle to 1°, adjust the motor power to 20%, and switch to 2TC mode operation; 60% operating condition: adjust the inlet guide vane angle to 10°, the diffuser blade angle to 0°, the turbine stator angle to 2°, adjust the motor power to 0, and maintain 2TC mode operation; 70% operating condition: adjust the inlet guide vane angle to 10°, the diffuser blade angle to 0°, the turbine stator angle to 1°, maintain the motor power unchanged, and maintain 2TC mode operation.

[0058] Under high working conditions (80%-100%), the diesel engine has a large operating load. At this time, the motor is adjusted to be in generator mode, and part of the recovered turbine energy is converted into electrical energy through the generator and stored in the battery. The angles of various components are adjusted to ensure efficient operation of the diesel engine while reducing thermal and mechanical loads. The specific adjustment strategies are as follows:

[0059] 80% operating condition: adjust the inlet guide vane angle to 0°, the diffuser blade angle to -2°, the turbine stator angle to 1°, and maintain 2TC mode operation; 90% operating condition: adjust the inlet guide vane angle to 0°, the diffuser blade angle to -2°, the turbine stator angle to 0°, and maintain 2TC mode operation; 100% operating condition: adjust the inlet guide vane angle to -5°, the diffuser blade angle to 0°, the turbine stator angle to 0°, and maintain 2TC mode operation.

[0060] The influence of three different adjustable components on the diesel engine is used to calculate the corresponding optimized supercharging strategy under 10 working conditions according to the propulsion characteristics of the diesel engine. Overall, the power of the marine diesel engine is improved in all working conditions, especially in low working conditions. As the working conditions improve, the power increase decreases, the fuel consumption rate decreases, the pre-turbine temperature decreases significantly, and the maximum combustion pressure decreases under high working conditions. The compressor surge margin is improved under medium and high working conditions, and the compressor efficiency is also improved accordingly. The thermal load and mechanical load of the diesel engine are reduced, which broadens the operating area of ​​the diesel engine and improves the operating efficiency of the compressor, and the matching is good.

[0061] A control method was developed to optimize the performance of a diesel engine by adjusting the angles of the adjustable components (inlet guide vanes, diffuser blades, turbine stators) in an intelligent adjustable electrically assisted turbocharging system of the diesel engine. Figure 6 The present invention is a flow chart of a control method of an intelligent adjustable electric-assisted turbocharging system based on a 16-cylinder marine diesel engine, which involves the following steps:

[0062] ① Run the diesel engine, start the control system and perform initialization operations, check and calibrate all sensors to ensure that they can accurately obtain and transmit the operating data of the diesel engine, obtain initial data from the sensors and diesel engine control unit, including ambient temperature, pressure, and initial state data of the diesel engine, so that it enters normal operating state.

[0063] ② Initialize the angles of each adjustable component, and set the angles of the inlet guide vanes, diffuser blades, and turbine stator blades in the variable geometry supercharging system to the initial set values. That is, set the inlet guide vane adjustment angle to 0°, record the initial blade installation angle of the compressor diffuser as VGC0°, and record the initial stator blade installation angle of the turbine stator as 0°.

[0064] ③ Obtain the current operating condition (load condition) of the diesel engine, obtain the current operating condition data of the diesel engine in real time, and analyze and determine the specific type of the current operating condition.

[0065] ④ Select the adjustment strategy according to the working conditions. According to the current load conditions and the corresponding optimized boost strategies under 10 working conditions, adjust the motor mode and power, select the corresponding inlet guide vane angle, diffuser blade angle and turbine stator blade angle, and determine the supercharger operation mode (1TC or 2TC).

[0066] ⑤ Adjust the adjustable components, adjust the motor mode to be in generator mode or motor mode, adjust the motor power, adjust the inlet guide vane angle, adjust the diffuser blade angle, adjust the turbine stator blade angle, and determine whether it is necessary to switch the supercharger operation mode or maintain the original supercharger operation mode.

[0067] ⑥ Monitor diesel engine performance parameters, including diesel engine power, fuel consumption rate, turbine inlet temperature, maximum combustion pressure, compressor surge margin and compressor efficiency. Compare these performance parameters with the optimization target.

[0068] ⑦ Adjustment and feedback: If the monitored performance parameters do not reach the optimization target, readjust the angle of the adjustable component and repeat step 3. If the performance parameters reach the optimization target, keep the current settings.

[0069] ⑧Continuous monitoring and adjustment: Continuously monitor the operating status and performance parameters of the diesel engine, and make real-time adjustments to cope with changes in different operating conditions.

[0070] Through the above control method, the power and economy of the diesel engine can be effectively optimized, the thermal load and mechanical load can be reduced, the operating area can be widened and the compressor efficiency can be improved.

Claims

1. Intelligent adjustable electric-assisted turbocharging system, Its characteristics are: Including engine , a basic turbine, a basic compressor, a controlled turbine, and a controlled compressor. The basic turbine is coaxial with the basic compressor, the controlled turbine is connected to the controlled compressor through a turbine shaft, a motor is installed on the turbine shaft, an adjustable inlet guide vane is installed at the inlet of the controlled compressor, an adjustable blade diffuser is installed at the outlet of the controlled compressor, the controlled turbine is provided with adjustable stator blades, the outlets of the basic compressor and the controlled compressor are connected to an intercooler after merging, the intercooler is connected to an intake manifold through an intake pipe, the intake manifold is connected to the engine, the inlets of the basic turbine and the controlled turbine are connected to an exhaust pipe after merging, and the exhaust pipe is connected to the engine through an exhaust manifold.

2. The intelligent adjustable electrically assisted turbocharging system according to claim 1, Its characteristics are: The adjustment of the adjustable stator blades of the controlled turbine includes 0°, 1° and 2°; the adjustment of the adjustable inlet guide vanes includes 0°, negative rotation 5°, positive rotation 10° and positive rotation 25°; the adjustment of the adjustable blade diffuser includes 0°, rotation 2° in the direction of reducing the flow area and rotation 2° in the direction of increasing the flow area.

3. The intelligent adjustable electrically assisted turbocharging system according to claim 1, Its characteristics are: It also includes an EGR system, the outlet and inlet of the EGR system are respectively connected to the intake pipe and the exhaust pipe, and an EGR valve is installed at the outlet of the EGR system.

4. The intelligent adjustable electrically assisted turbocharging system according to claim 1, Its characteristics are: An air valve is installed at the outlet of the basic compressor, and a gas valve is installed at the inlet of the basic turbine.

5. Control method of intelligent adjustable electric assisted turbocharging system, Its characteristics are: The intelligent adjustable electrically assisted turbocharging system as claimed in claim 1 is used: (1) Run the engine, check and calibrate all sensors, obtain initial data, including ambient temperature, pressure, and initial state data of the engine, and put it into normal operating state; (2) Initializing the angles of the adjustable components, and setting the angles of the adjustable inlet guide vanes, the adjustable vane diffuser, and the adjustable stator blades of the turbine control unit to the initial set values; (3) Obtain the current operating condition of the engine, obtain the current operating condition data of the engine in real time, and analyze and determine the specific type of the current operating condition; (4) Selecting an adjustment strategy according to the operating conditions, adjusting the motor mode and power according to the current load condition and the corresponding optimized supercharging strategy under 10 operating conditions, selecting the corresponding inlet guide vane angle, diffuser blade angle and turbine stator blade angle, and determining the supercharger operation mode; (5) Adjust the adjustable components, adjust the motor mode to make it in generator mode or motor mode, adjust the motor power, adjust the adjustable inlet guide vanes, adjustable vane diffuser and adjustable stator blade angle of the turbine, and determine whether to switch the supercharger operation mode or maintain the original supercharger operation mode; (6) Monitor engine performance parameters, including engine power, fuel consumption, turbine inlet temperature, maximum combustion pressure, compressor surge margin, and compressor efficiency, and compare these performance parameters with optimization targets; (7) If the performance parameter does not reach the optimization target, readjust the angle of the adjustable component and repeat step (3); if the performance parameter reaches the optimization target, keep the current setting; (8) Continuous monitoring and adjustment: Continuously monitor the engine operating status and performance parameters, and make real-time adjustments to cope with changes in different operating conditions.

6. The control method of the intelligent adjustable electrically assisted turbocharger system according to claim 5, Its characteristics are: The 10 working conditions are respectively 10% working condition, 20% working condition, 30% working condition, 40% working condition, 50% working condition, 60% working condition, 70% working condition, 80% working condition, 90% working condition and 100% working condition.

7. The control method of the intelligent adjustable electrically assisted turbocharger system according to claim 6, Its characteristics are: The specific control methods for the 10 working conditions are as follows: 10% working condition: adjust the inlet guide vane angle to 10°, the diffuser blade angle to -2°, the turbine stator blade angle to 2°, and adjust the motor power to 100%, so that the diesel engine runs in 1TC mode; 20% working condition: adjust the inlet guide vane angle to -5°, the diffuser blade angle to -2°, the turbine stator blade angle to 1°, adjust the motor power to 80%, and maintain 1TC mode operation; 30% working condition: adjust the inlet guide vane angle to 0°, the diffuser blade angle to -2°, the turbine stator blade angle to 0°, maintain the motor power unchanged, and keep running in 1TC mode; 40% working condition: adjust the inlet guide vane angle to -5°, the diffuser blade angle to -2°, the turbine stator blade angle to 0°, maintain the motor power unchanged, and keep running in 1TC mode; 50% working condition: adjust the inlet guide vane angle to 25°, the diffuser blade angle to 2°, the turbine stator blade angle to 1°, adjust the motor power to 20%, and switch to 2TC mode; 60% working condition: adjust the inlet guide vane angle to 10°, the diffuser blade angle to 0°, the turbine stator blade angle to 2°, adjust the motor power to 0, and maintain 2TC mode operation; 70% working condition: adjust the inlet guide vane angle to 10°, the diffuser blade angle to 0°, the turbine stator blade angle to 1°, maintain the motor power unchanged, and keep running in 2TC mode; 80% working condition: adjust the inlet guide vane angle to 0°, the diffuser blade angle to -2°, the turbine stator blade angle to 1°, and maintain 2TC mode operation; 90% working condition: adjust the inlet guide vane angle to 0°, the diffuser blade angle to -2°, the turbine stator blade angle to 0°, and maintain 2TC mode operation; 100% operating condition: adjust the inlet guide vane angle to -5°, the diffuser blade angle to 0°, the turbine stator blade angle to 0°, and maintain 2TC mode operation.

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