CN111963327A - Altitude-variable boost pressure self-adaptive adjustment control method for two-stage adjustable supercharged diesel engine - Google Patents

Altitude-variable boost pressure self-adaptive adjustment control method for two-stage adjustable supercharged diesel engine Download PDF

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CN111963327A
CN111963327A CN202010639023.2A CN202010639023A CN111963327A CN 111963327 A CN111963327 A CN 111963327A CN 202010639023 A CN202010639023 A CN 202010639023A CN 111963327 A CN111963327 A CN 111963327A
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pressure
diesel engine
altitude
stage
supercharging
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刘瑞林
丁豪坚
张众杰
董素荣
杨春浩
周广猛
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Army Military Transportation University
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Army Military Transportation University
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/0002—Controlling intake air
    • F02D41/0007—Controlling intake air for control of turbo-charged or super-charged engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
    • F02B37/013—Engines characterised by provision of pumps driven at least for part of the time by exhaust with exhaust-driven pumps arranged in series
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
    • F02B37/12—Control of the pumps
    • F02B37/18—Control of the pumps by bypassing exhaust from the inlet to the outlet of turbine or to the atmosphere
    • F02B37/183—Arrangements of bypass valves or actuators therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
    • F02D41/1405—Neural network control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
    • F02D2041/1412—Introducing closed-loop corrections characterised by the control or regulation method using a predictive controller
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
    • F02D2041/1433—Introducing closed-loop corrections characterised by the control or regulation method using a model or simulation of the system
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Artificial Intelligence (AREA)
  • Evolutionary Computation (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Supercharger (AREA)

Abstract

A two-stage adjustable supercharged diesel engine variable-altitude supercharging pressure self-adaptive adjustment control method is characterized in that a diesel engine ECU (electronic control unit) queries variable-altitude diesel engine torque MAP (maximum torque) by combining the position of an accelerator pedal, the rotating speed of a diesel engine and the altitude which are monitored in real time to obtain expected torque of the current working condition; inquiring a corresponding curve of the torque and the air intake flow according to the expected torque to obtain the expected air intake amount of the two-stage supercharging system; inquiring a compressed air characteristic MAP of a high-pressure stage supercharger and a low-pressure stage supercharger according to expected air inflow to obtain total pressure of a two-stage supercharging system, calculating the opening degrees of a high-pressure stage bypass valve and a low-pressure stage bypass valve by an NMPC supercharging pressure controller according to the difference between the expected pressure and the actual pressure, and controlling the opening degree change of a blade by an ECU of a diesel engine to enable the actual supercharging pressure to be equal to the expected supercharging pressure. The invention can realize the self-adaptation of the secondary adjustable supercharged diesel engine with variable altitude of supercharging pressure, improves the high altitude transient noise characteristic and acceleration characteristic of the diesel engine, and effectively relieves the influence of altitude rise on the dynamic property and economy of the diesel engine.

Description

Altitude-variable boost pressure self-adaptive adjustment control method for two-stage adjustable supercharged diesel engine
Technical Field
The invention relates to the field of engine control, in particular to a self-adaptive adjusting and controlling method for variable-altitude supercharging pressure of a two-stage adjustable supercharged diesel engine.
Background
China is a big plateau country and has the highest plateau region in the world. The Qinghai-Tibet plateau is the most representative plateau in the world, the average altitude exceeds 4000m, the total area reaches 240 km2, and the Qinghai-Tibet plateau occupies 1/4 of the territorial area of China. When the vehicle runs on a plateau road (such as Qinghai-Tibet line, Chuanzang line, Dian-Tibet line and the like), the intake quality of the diesel engine is reduced, so that the combustion of the diesel engine is deteriorated, and the technical performances such as power, fuel consumption rate, heat load and the like are obviously deteriorated. According to statistics, the diesel engine dynamic of the elevation of 1000m per liter is reduced by 4.0-13.0%, the economical efficiency is reduced by 2.7-12.9%, and the temperature of the vortex front exhaust and the cylinder cover is increased by 7-10%. The existing diesel engine supercharging system has the defect that supercharging pressure cannot be automatically adjusted according to altitude change.
Disclosure of Invention
The invention provides a secondary adjustable supercharged diesel engine variable-altitude supercharged pressure self-adaptive adjusting control method, aiming at the defect that the conventional diesel engine supercharged system cannot automatically adjust supercharged pressure according to altitude change.
As conceived above, the technical scheme of the invention is as follows: a two-stage adjustable supercharged diesel engine variable-altitude supercharging pressure self-adaptive adjustment control method is characterized by comprising the following steps of: the method comprises the following steps:
firstly, storing a relation table of air pressure and altitude, a variable altitude diesel engine torque MAP, a relation curve of torque and air intake flow, a high-pressure stage supercharger air compression characteristic MAP graph and a low-pressure stage supercharger air compression characteristic MAP graph in a diesel engine ECU;
acquiring a position change signal of an accelerator pedal by the ECU of the diesel engine in real time;
when the position change of the accelerator pedal is detected, the diesel engine ECU acquires the current atmospheric pressure and the diesel engine rotating speed, inquires a relation table of air pressure and altitude, converts the current atmospheric pressure into altitude, and inquires the variable altitude diesel engine torque MAP based on the position, the altitude and the rotating speed of the accelerator pedal to obtain the expected torque of the current working condition;
inquiring a relation curve between the torque and the air inflow by the ECU of the diesel engine based on the expected torque to obtain the expected air inflow of the two-stage supercharging system;
inquiring an air compression characteristic MAP graph of a high-pressure stage supercharger and an air compression characteristic MAP graph of a low-pressure stage supercharger by the diesel engine ECU according to the expected air input of the two-stage supercharging system to obtain expected supercharging pressures of the two-stage supercharging system of the high-pressure stage supercharger and the low-pressure stage supercharger;
acquiring the actual pressure of the current high-pressure supercharger and the current low-pressure supercharger by the NMPC supercharging pressure controller, calculating the opening regulating quantity of the high-pressure bypass valve and the low-pressure bypass valve based on the supercharging pressure of the current high-pressure supercharger and the supercharging pressure expected by the high-pressure supercharger and the low-pressure supercharger, and sending the opening regulating quantity of the high-pressure bypass valve and the low-pressure bypass valve to the ECU of the diesel engine;
and the ECU of the diesel engine controls the opening of the high-pressure stage bypass valve and the low-pressure stage bypass valve to enable the actual boost pressure to be equal to the expected boost pressure.
Further, the accelerator pedal position change may be an accelerator opening change or a pedal inclination change.
Further, the table of the relationship between the air pressure and the altitude is referred to the national standard GB/T20969.1-2007.
Further, the variable-altitude diesel engine torque MAP is used for carrying out a diesel engine variable-altitude performance test based on a diesel engine high-altitude performance test bed to obtain three-dimensional MAP of the diesel engine with different working conditions, altitudes, torques and an accelerator pedal.
Further, the relation curve of the torque and the intake air flow is obtained by performing a diesel engine altitude-variable performance test on the basis of a diesel engine altitude-variable performance test bed.
Further, the NMPC boost pressure controller is a boost pressure controller adopting a nonlinear model predictive control method.
Further, the NMPC boost pressure controller adopts a standard particle swarm algorithm to solve an optimal performance function to obtain an optimal control sequence of the bypass valve at the moment k:
minJ＝ρpΣ[ps(k+j)-p(k+j)]2+ρUΣ[u(k+j-1)-u(k+j-2)]2
subject to
uHmin(k+j)<uH(k+j)<uHmax(k+j),j＝0,1,2,…Nu-1
uLmin(k+j)<uL(k+j)<uLmax(k+j),j＝0,1,2,…Nu-1
Δumin≤u(k+j-1)-u(k+j-2)≤Δumax
where ρ ispAs a pressure error weight, ρUTo control the incremental weight, k is the current time, NuFor controlling the time domain length, u is the control amount of the high and low pressure stage bypass valve opening, PsThe expected boost pressure is obtained, and p is a predicted value of the model boost pressure of the diesel engine boost system prediction;
uHmaxmaximum opening of the high-pressure bypass valve uHminMinimum opening of the high-pressure bypass valve uLmaxMaximum opening of the low-pressure bypass valve uLminMinimum opening of the low-pressure stage bypass valve, DeltaumaxFor the upper limit of the single adjustment, Δ uminThe lower limit of the single adjustment amount.
Further, the prediction model of the diesel engine supercharging system is established by adopting a BP neural network, the input of the prediction model comprises the opening degree of an accelerator, the altitude, the opening degree of a high-pressure level bypass valve and the opening degree of a low-pressure level bypass valve, and the output of the prediction model comprises supercharging pressure.
Because the change of the position of the accelerator pedal implies the change of the opening of the accelerator, the final fuel injection quantity of the diesel engine is influenced, and the change of the position of the accelerator pedal represents the driving intention of a driver, the supercharging system is adjusted by judging the driving intention of the driver, the quick and timely dynamic response relation between the driver and the diesel engine is favorably established, and the transient response characteristic of the diesel engine under the condition of high altitude is improved. Therefore, the invention obtains the altitude and the position of the accelerator pedal of the diesel engine in real time through the ECU of the diesel engine, calculates the expected supercharging pressure, and ensures that the actual supercharging pressure of the diesel engine is equal to the expected supercharging pressure through cooperatively controlling the opening of the high-pressure bypass valve and the low-pressure bypass valve so as to meet the air intake requirements of the diesel engine at different altitudes and furthest relieve the influence of the altitude on the power performance and the economy of the diesel engine.
Drawings
FIG. 1 is a schematic diagram of a two-stage variable supercharged diesel engine provided by the present invention;
FIG. 2 is a control flow diagram of the present invention;
FIG. 3 is a control schematic of the NMPC boost pressure controller;
FIG. 4 is a topological diagram of a neural network prediction model of a two-stage supercharging system of a diesel engine;
fig. 5 is a control flow diagram for the NMPC boost pressure controller.
In the figure: 1-a diesel engine; 2-a rotational speed sensor; 3. 7-an intercooler; 4-a high pressure stage supercharger outlet pressure sensor; 5-a high-pressure stage supercharger inlet pressure sensor; 6. 10-a compressor; 8-low pressure stage supercharger outlet pressure sensor; 9-atmospheric pressure sensor; 11. 14-turbine bypass valve opening sensor; 12. 15-a turbine bypass valve; 13. 16-turbine.
Detailed Description
The invention is described in detail below with reference to the figures and specific examples.
As shown in FIG. 1, the invention provides a regulation control method of a variable-altitude supercharging pressure adaptive system of a two-stage adjustable supercharged diesel engine, wherein the adaptive system comprises a diesel engine controller ECU, a rotating speed sensor, an accelerator pedal sensor, a high-pressure VGT supercharger, a low-pressure VGT supercharger, a high-pressure supercharger outlet pressure sensor, a high-pressure supercharger inlet pressure sensor, a low-pressure supercharger outlet pressure sensor, an atmospheric pressure sensor and an NMPC supercharging pressure controller.
As shown in fig. 2, the control flow of the boost pressure adaptive system includes steps S1, S2, S3, S4, S5, and S6, which are described in detail below.
In step S1, the diesel engine controller ECU monitors the accelerator pedal position change in real time. The accelerator pedal position change may be an accelerator opening change or a pedal inclination change.
In step S2, when a change in accelerator pedal position is detected, the ECU acquires the current atmospheric pressure and diesel engine speed, queries the air pressure-altitude relationship table, converts the current atmospheric pressure to altitude, and queries the diesel engine altitude-varying torque MAP based on the accelerator pedal position, altitude, and speed to obtain the desired torque for the current operating condition. The relation table of the air pressure and the altitude refers to national standard GB/T20969.1-2007, and the altitude-variable diesel engine torque MAP is based on a diesel engine high altitude performance test bed to perform a diesel engine altitude-variable performance test to obtain the three-dimensional MAP of the diesel engine with different working conditions, altitudes, torques and an accelerator pedal.
In step S3, the diesel engine controller ECU obtains a desired intake air amount for the two-stage supercharging system based on the query torque versus intake air flow. The relation curve of the torque and the intake air flow is obtained by performing a diesel engine altitude-variable performance test based on a diesel engine altitude-variable performance test bed.
In step S4, the diesel engine controller ECU inquires the high-pressure stage and low-pressure stage supercharger compression characteristics MAP based on the intake air flow rate of the two-stage supercharging system, and the pressure ratio of the high-pressure stage supercharger to the low-pressure stage supercharger is as follows according to actual needs, i.e. 6: 4. 5:5 and 4:6, and obtaining the expected boost pressure of the high-pressure stage supercharger and the low-pressure stage supercharger. Wherein the compression characteristics MAP of the high-pressure stage and the low-pressure stage are provided by a booster manufacturer.
In step S5, the NMPC boost pressure controller obtains current high and low stage boost pressures, calculates high and low stage bypass valve opening adjustment amounts based on the current high and low stage supercharger boost pressures and the desired high and low stage supercharger boost pressures, and sends the high and low stage bypass valve opening adjustment amounts to the ECU. The NMPC supercharging pressure controller is a supercharging pressure controller adopting a nonlinear model prediction control method, and specifically realizes control by solving an optimal performance function of a supercharging system in a rolling manner.
In step S6, the ECU applies the high-pressure stage bypass valve opening adjustment amount to the high-pressure stage turbine bypass valve and the low-pressure stage turbine bypass valve, and the NMPC boost pressure controller obtains the high-pressure stage boost pressure and the low-pressure stage boost pressure after the application of the high-pressure stage bypass valve opening adjustment amount and the low-pressure stage bypass valve opening adjustment amount, and solves the control amount in the next time domain by combining the expected boost pressure rolling optimization loop.
In step S1, the NMPC boost pressure controller and the diesel engine controller ECU control the high and low pressure stage bypass valve openings to remain unchanged when the accelerator pedal sensor does not detect a change in accelerator pedal position.
As shown in fig. 3, the NMPC boost pressure controller uses a standard particle swarm algorithm to solve the optimal performance function to obtain the optimal control sequence of the bypass valve at the time k:
minJ＝ρpΣ[ps(k+j)-p(k+j)]2+ρUΣ[u(k+j-1)-u(k+j-2)]2
j＝0,1,2,…Nu-1
where ρ ispAs a pressure error weight, ρUTo control the incremental weight, k is the current time, NuFor controlling the time domain length, u is the control amount of the high and low pressure stage bypass valve opening, PsAnd p is a predicted value of the boost pressure of the neural prediction model of the diesel engine boost system for the expected boost pressure.
In the actual control, the system stability and the execution dynamic response are considered, the adjustment quantity is prevented from being too large, the valve opening is prevented from exceeding the actual limit value, and the optimization solving process meets the following limiting conditions:
uHmin(k+j)<uH(k+j)<uHmax(k+j),j＝0,1,2,…Nu-1
uLmin(k+j)<uL(k+j)<uLmax(k+j),j＝0,1,2,…Nu-1
Δumin≤u(k+j-1)-u(k+j-2)≤Δumax
wherein u isHmaxMaximum opening of the high-pressure bypass valve uHminMinimum opening of the high-pressure bypass valve uLmaxMaximum opening of the low-pressure bypass valve uLminMinimum opening of the low-pressure stage bypass valve, DeltaumaxIs the upper limit of the single adjustment，ΔuminThe lower limit of the single adjustment amount.
The optimal performance function is obtained based on a diesel engine supercharging system model, a diesel engine secondary supercharging system has the characteristics of nonlinearity and strong coupling, and the traditional average value simulation is difficult to accurately simulate the dynamic characteristics of the supercharging system, so that a BP neural network is adopted to establish a diesel engine secondary supercharging system performance prediction model, which can be described as follows:
y＝fbp(u)
wherein y is the neural network response output and u is the analog control quantity.
FIG. 4 is a topological diagram of a neural network prediction model of a two-stage supercharging system of a diesel engine, wherein inputs include throttle opening, altitude, high-pressure stage bypass valve opening and low-pressure stage bypass valve opening; the output includes boost pressure.
FIG. 5 is a control flow diagram of a non-linear model predictive controlled NMPC boost pressure controller employing a standard particle swarm algorithm to solve an optimal performance function. After the particle swarm algorithm solves the optimal control sequence of the bypass valve at the time k, the NMPC boost pressure controller acts on the first value of the control sequence and sends the first value of the control sequence to the ECU, and the ECU acts on the bypass valve with the control quantity, so that the diesel engine NMPC boost pressure controller completes the control at the time k. And at the moment k +1, the controller acquires the high-pressure level boost pressure and the low-pressure level boost pressure acted on the regulated quantity at the moment k, and performs boost pressure control at the moment k +1 by combining the expected boost pressure acquired at the moment k + 1.
The invention can realize the self-adaptive change of the variable-altitude supercharging pressure of the diesel engine, meet the air inlet requirements of the diesel engine on different working conditions and different altitudes, maintain the air-fuel ratio in a normal range, and furthest relieve the influence of altitude rise on the dynamic property and the economical efficiency of the diesel engine.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (8)

1. A two-stage adjustable supercharged diesel engine variable-altitude supercharging pressure self-adaptive adjustment control method is characterized by comprising the following steps of: the method comprises the following steps:
firstly, storing a relation table of air pressure and altitude, a variable altitude diesel engine torque MAP, a relation curve of torque and air intake flow, a high-pressure stage supercharger air compression characteristic MAP graph and a low-pressure stage supercharger air compression characteristic MAP graph in a diesel engine ECU;
acquiring a position change signal of an accelerator pedal by the ECU of the diesel engine in real time;
when the position change of the accelerator pedal is detected, the diesel engine ECU acquires the current atmospheric pressure and the diesel engine rotating speed, inquires a relation table of air pressure and altitude, converts the current atmospheric pressure into altitude, and inquires the variable altitude diesel engine torque MAP based on the position, the altitude and the rotating speed of the accelerator pedal to obtain the expected torque of the current working condition;
inquiring a relation curve between the torque and the air inflow by the ECU of the diesel engine based on the expected torque to obtain the expected air inflow of the two-stage supercharging system;
inquiring an air compression characteristic MAP graph of a high-pressure stage supercharger and an air compression characteristic MAP graph of a low-pressure stage supercharger by the diesel engine ECU according to the expected air input of the two-stage supercharging system to obtain expected supercharging pressures of the two-stage supercharging system of the high-pressure stage supercharger and the low-pressure stage supercharger;
acquiring the actual pressure of the current high-pressure supercharger and the current low-pressure supercharger by the NMPC supercharging pressure controller, calculating the opening regulating quantity of the high-pressure bypass valve and the low-pressure bypass valve based on the supercharging pressure of the current high-pressure supercharger and the supercharging pressure expected by the high-pressure supercharger and the low-pressure supercharger, and sending the opening regulating quantity of the high-pressure bypass valve and the low-pressure bypass valve to the ECU of the diesel engine;
and the ECU of the diesel engine controls the opening of the high-pressure stage bypass valve and the low-pressure stage bypass valve to enable the actual boost pressure to be equal to the expected boost pressure.
2. The method for adaptively adjusting and controlling the variable-altitude supercharging pressure of the two-stage adjustable supercharged diesel engine according to claim 1, wherein the method comprises the following steps of: the accelerator pedal position change may be an accelerator opening change or a pedal inclination change.
3. The method for adaptively adjusting and controlling the variable-altitude supercharging pressure of the two-stage adjustable supercharged diesel engine according to claim 1, wherein the method comprises the following steps of: the air pressure and altitude relation table is referred to national standard GB/T20969.1-2007.
4. The method for adaptively adjusting and controlling the variable-altitude supercharging pressure of the two-stage adjustable supercharged diesel engine according to claim 1, wherein the method comprises the following steps of: the variable-altitude diesel engine torque MAP is a diesel engine variable-altitude performance test based on a diesel engine high-altitude performance test bed, and three-dimensional MAP of the diesel engine with different working conditions, altitudes, torques and an accelerator pedal is obtained.
5. The method for adaptively adjusting and controlling the variable-altitude supercharging pressure of the two-stage adjustable supercharged diesel engine according to claim 1, wherein the method comprises the following steps of: the relation curve of the torque and the intake air flow is obtained by performing a diesel engine altitude-variable performance test on the basis of a diesel engine altitude performance test bed.
6. The method for adaptively adjusting and controlling the variable-altitude supercharging pressure of the two-stage adjustable supercharged diesel engine according to claim 1, wherein the method comprises the following steps of: the NMPC boost pressure controller is a boost pressure controller adopting a nonlinear model predictive control method.
7. The method for adaptively adjusting and controlling the variable-altitude supercharging pressure of the two-stage adjustable supercharged diesel engine as claimed in claims 1 and 6, wherein: the NMPC supercharging pressure controller adopts a standard particle swarm algorithm to solve an optimal performance function to obtain an optimal control sequence of the bypass valve at the moment k:
minJ＝ρpΣ[ps(k+j)-p(k+j)]2+ρUΣ[u(k+j-1)-u(k+j-2)]2
subjectto
uHmin(k+j)<uH(k+j)<uHmax(k+j),j＝0,1,2,…Nu-1
uLmin(k+j)<uL(k+j)<uLmax(k+j),j＝0,1,2,…Nu-1
Δumin≤u(k+j-1)-u(k+j-2)≤Δumax
where ρ ispAs a pressure error weight, ρUTo control the incremental weight, k is the current time, NuFor controlling the time domain length, u is the control amount of the high and low pressure stage bypass valve opening, PsThe expected boost pressure is obtained, and p is a predicted value of the model boost pressure of the diesel engine boost system prediction;
uHmaxmaximum opening of the high-pressure bypass valve uHminMinimum opening of the high-pressure bypass valve uLmaxMaximum opening of the low-pressure bypass valve uLminMinimum opening of the low-pressure stage bypass valve, DeltaumaxFor the upper limit of the single adjustment, Δ uminThe lower limit of the single adjustment amount.
8. The method for adaptively adjusting and controlling the variable-altitude supercharging pressure of the two-stage adjustable supercharged diesel engine according to claim 7, wherein the method comprises the following steps of: the prediction model of the diesel engine supercharging system is established by adopting a BP neural network, the input of the prediction model comprises the opening degree of an accelerator, the altitude, the opening degree of a high-pressure level bypass valve and the opening degree of a low-pressure level bypass valve, and the output of the prediction model comprises supercharging pressure.
CN202010639023.2A 2020-07-06 2020-07-06 Altitude-variable boost pressure self-adaptive adjustment control method for two-stage adjustable supercharged diesel engine Pending CN111963327A (en)

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CN113464271A (en) * 2021-08-03 2021-10-01 航天时代飞鸿技术有限公司 Closed-loop control method and system for pressure of supercharger for aviation two-stroke piston engine
CN114060143A (en) * 2021-10-12 2022-02-18 上海交通大学 Variable-altitude boost pressure stability control method based on bypass valve flow characteristic
CN116241366A (en) * 2023-03-28 2023-06-09 上海交通大学 Intelligent variable mode control method for diesel engine variable elevation supercharging system
CN116771487A (en) * 2023-03-28 2023-09-19 上海交通大学 Two-stage supercharging energy efficient self-adaptive control method based on supercharger rotation speed

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CN113250810A (en) * 2021-06-29 2021-08-13 四川迅联达智能科技有限公司 Method and system for stabilizing intake pressure of two-stroke engine
CN113250810B (en) * 2021-06-29 2021-10-01 四川迅联达智能科技有限公司 Method and system for stabilizing intake pressure of two-stroke engine
CN113464271A (en) * 2021-08-03 2021-10-01 航天时代飞鸿技术有限公司 Closed-loop control method and system for pressure of supercharger for aviation two-stroke piston engine
CN113464271B (en) * 2021-08-03 2023-01-06 航天时代飞鸿技术有限公司 Booster pressure closed-loop control method and system for aviation two-stroke piston engine
CN114060143A (en) * 2021-10-12 2022-02-18 上海交通大学 Variable-altitude boost pressure stability control method based on bypass valve flow characteristic
CN116241366A (en) * 2023-03-28 2023-06-09 上海交通大学 Intelligent variable mode control method for diesel engine variable elevation supercharging system
CN116771487A (en) * 2023-03-28 2023-09-19 上海交通大学 Two-stage supercharging energy efficient self-adaptive control method based on supercharger rotation speed
CN116241366B (en) * 2023-03-28 2023-10-10 上海交通大学 Intelligent variable mode control method for diesel engine variable elevation supercharging system
CN116771487B (en) * 2023-03-28 2024-03-29 上海交通大学 Two-stage supercharging energy efficient self-adaptive control method based on supercharger rotation speed
US12025066B1 (en) 2023-03-28 2024-07-02 Shanhai Jiao Tong University Intelligent variable mode control method for variable altitude turbocharging system of diesel engine

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