阅读说明：本技术 柴油机双vgt二级可调增压系统与燃油共轨系统变海拔协同控制方法 (The double VGT second level adjustable pressurization systems of diesel engine and oil common rail system become height above sea level cooperative control method ) 是由 刘瑞林 张众杰 周广猛 董素荣 于 2018-05-23 设计创作，主要内容包括：一种柴油机双VGT二级可调增压系统与燃油共轨系统变海拔协同控制方法,包括：1、柴油机变海拔多目标、多参数优化算法,①确定柴油机变海拔性能优化目标和控制参数；②建立BP神经网络ANN预测模型；③将粒子群PSO多目标优化算法与神经网络ANN结合进行联合优化,将ANN模型预测值作为优化样本；2、双VGT二级可调增压系统与燃油共轨喷射系统协同控制方法,协同控制喷油参数,改善柴油机高原条件下“油-气-室”匹配。该方法根据海拔和柴油机工况的变化,增压系统与喷油系统控制器基于各控制参数优化标定的MAP,动态协同控制柴油机喷油量、喷油提前角、HVGT、LVGT,实现在0m～5500m海拔范围内,柴油机动力性、经济性和排放特性优化改善。(A kind of double VGT second level adjustable pressurization systems of diesel engine and oil common rail system become height above sea level cooperative control method, comprising: 1. 1, diesel altitude-variable multiple target, multi-parameters optimization algorithm determine diesel altitude-variable performance optimization aim and control parameter；2. establishing BP neural network ANN prediction model；3. population PSO multi-objective optimization algorithm is carried out combined optimization in conjunction with neural network ANN, using ANN model predicted value as optimization sample；2, double VGT second level adjustable pressurization systems and fuel common-rail spraying system cooperative control method, Collaborative Control fuel injection parameter improve under diesel engine high conditions " oil-gas-room " and match.This method is according to the variation of height above sea level and diesel engine condition, the MAP that pressure charging system and injection system controller are demarcated based on each Optimization about control parameter, dynamic cooperation controls Fuel Injection Quantity for Diesel, injection advance angle, HVGT, LVGT, it realizes in 0m~5500m altitude ranges, engine power performance, economy and emission performance optimization improve.)

1. a kind of double VGT second level adjustable pressurization systems of diesel engine and oil common rail system become height above sea level cooperative control method, feature It is: is sprayed including diesel altitude-variable multiple target, multi-parameters optimization algorithm and double VGT second level adjustable pressurization systems and fuel common-rail Penetrate systematic collaboration control method；Wherein:

The diesel altitude-variable multiple target, multi-parameters optimization algorithm, include the following steps:

1. determining diesel altitude-variable performance optimization aim and control parameter；

2. BP neural network ANN prediction model, including input layer, hidden layer and output layer are established, using the GT- after check POWER software work process simulation model calculates data and is trained to ANN, and using actual diesel engine test data to ANN Model evaluation；

3. population PSO multi-objective optimization algorithm is carried out combined optimization in conjunction with neural network ANN, by ANN model predicted value As optimization sample；

The process of PSO-ANN combined optimization is: initializing first to the position and speed of particle (control parameter), calls ANN mould Individual goal value and binding occurrence is calculated in type, then carries out fitness calculating, and feedback cycle updates the speed of particle position, and The final particle for obtaining optimal adaptation degree；

Double VGT second level adjustable pressurization systems and fuel common-rail spraying system cooperative control method are Collaborative Control oil spout ginsengs Number, i.e. distributive value and injection advance angle and boost pressure regulation parameter, i.e. hiigh pressure stage VGT blade opening HVGT, low-pressure stage VGT blade are opened LVGT is spent, improves under diesel engine high conditions " oil-gas-room " and matches, double VGT second level adjustable supercharging control units receive diesel engine Revolving speed and load signal first determine whether that the working condition of diesel engine is steady state condition or transient condition.If diesel engine works in Steady state condition, using feedback control module, microprocessor inquires the high/low initial Maipu MAP of blower outlet optimum pressure of arbitrarily downgrading, And height above sea level atmospheric pressure and temperature signal based on the received, initial pressure MAP is modified, target boost pressure MAP is obtained, Compared with boost pressure and charge flow rate actual feedback signal, the high and low VGT that arbitrarily downgrades is controlled according to Model Predictive Control MPC method Blade opening.If diesel engine works in transient condition, using feedforward control module, electronic control unit microprocessor is according to receiving Diesel engine speed, load, atmosphere pressure signal inquire the high/low best MAP of VGT blade opening that arbitrarily downgrades, power driver module output Signal is executed, directly controls high and low VGT blade of arbitrarily downgrading to target aperture；

Diesel engine ECU, which is received, comes from diesel engine speed and load signal, inquires and obtains initial fuel injection parameter Maipu MAP, and according to Height above sea level signal atmospheric pressure and atmospheric temperature MAP initial to fuel injection parameter are modified, and obtain target fuel injection parameter, opened loop control Oil common rail system fuel injection parameter signal.

2. the double VGT second level adjustable pressurization systems of diesel engine according to claim 1 become height above sea level with oil common rail system and cooperate with Control method, it is characterised in that: above-mentioned diesel altitude-variable multiple target, multi-parameters optimization algorithm, specific steps include:

1. determining diesel altitude-variable performance optimization aim and control parameter: optimization aim includes torque Ttq, fuel consumption rate BSFC, NOx, CO and PM；Optimal control parameter includes distributive value, injection advance angle, hiigh pressure stage VGT blade opening HVGT, low pressure Grade VGT blade opening LVGT；

2. BP neural network ANN prediction model, including input layer, hidden layer and output layer are established, with diesel engine speed, oil spout Amount, injection advance angle, hiigh pressure stage VGT blade opening HVGT and low-pressure stage VGT blade opening LVGT are input layer, with optimization aim Torque Ttq, fuel consumption rate BSFC, NOx, CO and PM are output layer, imitative using the GT-POWER software work process after check True mode calculates data and is trained to ANN, and is assessed using actual diesel engine test data ANN model；

3. population PSO multi-objective optimization algorithm is carried out combined optimization in conjunction with neural network ANN, by ANN model predicted value As optimization sample, Optimal Parameters are as follows: Fuel Injection Quantity for Diesel, injection advance angle, HVGT and LVGT, optimization aim are as follows: torque Ttq, fuel consumption rate BSFC, NOx, CO and PM, constraint condition include: maximum combustion pressure, maximum combustion temperature, whirlpool front row Temperature, compressor surge line, secondary speed, minimum PM,

PSO fitness function indicates are as follows:

Wherein, w₁、w₂、w₃、w₄And w₅Respectively torque (Torque), specific oil consumption (BSFC), NOx, CO and PM weight.

Technical field

The present invention relates to technical field of engines, more particularly to a kind of double VGT second level adjustable pressurization systems of diesel engine with Oil common rail system becomes height above sea level cooperative control method.

Background technique

China is a plateau big country, possesses the maximum plateau region of area in the world.Qinghai-Tibet Platean is in the world most Representative plateau, mean sea level are more than 4000m, and the gross area accounts for about the 1/4 of national territorial area up to 2,400,000 km2.Vehicle is on plateau When driving, with height above sea level, drop is big, slope is steep, long slope is more, operating condition is complicated for highway (such as Qinghai-Tibet Railway, Sichuan-Tibet line and Yunnan-Tibet line) The characteristics of, charge reduction causes diesel combustion to deteriorate, and the items technical performance such as power, fuel consumption rate, thermic load is bad Change obvious.For a long time, due to lacking the research of systematic science, while lacking advanced experimental condition and technical support, cause Diesel engine it is generally existing in the use of plateau " power dropping, starting difficulty, easily boil, reliability and durability it is poor " etc. " plateau Syndrome " seriously restricts the national economy and national defense construction of highlands.According to statistics, the every raising 1000m diesel oil of height above sea level is motor-driven Power decline 4.0%~13.0%, economy decline 2.7%~12.9%, the front-seat mild cylinder cap temperature in whirlpool increases 7%~ 10%.

Under the conditions of becoming height above sea level variable working condition, diesel engine supercharging system belongs to combustion chamber to be pneumatically connected, and is had non-linear, strong The features such as coupling, multiple constraint, double VGT second level adjustable supercharging control system systems can be according to the variation of height above sea level and operating condition, in real time Boost pressure and charge flow rate are controlled, the density of the induced air of diesel engine under Different Altitude is improved, it is ensured that air-fuel ratio is best in cylinder, realizes The target that height above sea level 5500m diesel engine power does not reduce compared with 0m height above sea level.

To improve multiple indexs such as dynamic property, economy, emission performance under the conditions of diesel altitude-variable, how according to plateau The characteristics of environment, improves " oil-gas-room " matching of diesel engine, cooperates with pressure charging system and injection system under optimal control Different Altitude Multi-parameter becomes the key that performance improves.Therefore, it is necessary to be demarcated to pressure charging system under High aititude and injection system multi-parameters optimization, Formulate diesel engine multisystem, multi-parameters optimization and coordination control strategy.

Summary of the invention

For existing diesel, in the case where becoming altitude conditions, pressure charging system and oil common rail system are unable to the technology of Collaborative Control Defect, the present invention provides a kind of double VGT second level adjustable pressurization systems of diesel engine and oil common rail system becomes height above sea level Collaborative Control side Method, for this method according to the variation of height above sea level and diesel engine condition, it is excellent that pressure charging system with injection system controller is based on each control parameter Change the MAP of calibration, dynamic cooperation controls Fuel Injection Quantity for Diesel, injection advance angle, HVGT, LVGT, realizes in 0m~5500m height above sea level In range, engine power performance, economy and emission performance optimization improve.

The technical solution adopted to achieve the purpose of the present invention is: a kind of double VGT second level adjustable pressurization systems of diesel engine Become height above sea level cooperative control method with oil common rail system, it is characterised in that: including diesel altitude-variable multiple target, multi-parameters optimization Algorithm and double VGT second level adjustable pressurization systems and fuel common-rail spraying system cooperative control method；Wherein:

The diesel altitude-variable multiple target, multi-parameters optimization algorithm, include the following steps:

1. determining diesel altitude-variable performance optimization aim and control parameter；

2. BP neural network ANN prediction model, including input layer, hidden layer and output layer are established, using the GT- after check POWER software work process simulation model calculates data and is trained to ANN, and using actual diesel engine test data to ANN Model evaluation；

3. population PSO multi-objective optimization algorithm is subjected to combined optimization in conjunction with neural network ANN, ANN model is pre- Measured value is as optimization sample；

The process of PSO-ANN combined optimization is: initializing, calls to the position and speed of particle (control parameter) first Individual goal value and binding occurrence is calculated in ANN model, then carries out fitness calculating, and feedback cycle updates the speed of particle position Degree, and finally obtain the particle of optimal adaptation degree；

Double VGT second level adjustable pressurization systems and fuel common-rail spraying system cooperative control method are Collaborative Control oil spouts Parameter, i.e. distributive value and injection advance angle and boost pressure regulation parameter, i.e. hiigh pressure stage VGT blade opening HVGT, low-pressure stage VGT blade Aperture LVGT improves under diesel engine high conditions " oil-gas-room " and matches,

Double VGT second level adjustable supercharging control units receive diesel engine speed and load signal, first determine whether the work of diesel engine Making state is steady state condition or transient condition.If diesel engine works in steady state condition, using feedback control module, microprocessor The high/low initial Maipu MAP of blower outlet optimum pressure of arbitrarily downgrading is inquired, and height above sea level atmospheric pressure and temperature letter based on the received Number, initial pressure MAP is modified, target boost pressure MAP is obtained, with boost pressure and charge flow rate actual feedback signal Compare, controls high and low VGT blade opening of arbitrarily downgrading according to Model Predictive Control MPC method.If diesel engine works in transient condition, Using feedforward control module, electronic control unit microprocessor is looked into according to the diesel engine speed, load, atmosphere pressure signal that receive The high/low best MAP of VGT blade opening that arbitrarily downgrades is ask, power driver module output executes signal, directly controls high and low VGT leaf of arbitrarily downgrading Piece is to target aperture；

Diesel engine ECU, which is received, comes from diesel engine speed and load signal, and inquiry obtains initial fuel injection parameter Maipu MAP, and It is modified according to height above sea level signal atmospheric pressure and atmospheric temperature MAP initial to fuel injection parameter, obtains target fuel injection parameter, open loop Control oil common rail system fuel injection parameter signal.

Above-mentioned diesel altitude-variable multiple target, multi-parameters optimization algorithm, specific steps include:

1. determining diesel altitude-variable performance optimization aim and control parameter: optimization aim includes torque Ttq, fuel consumption Rate BSFC, NOx, CO and PM；Optimal control parameter includes distributive value, injection advance angle, hiigh pressure stage VGT blade opening HVGT, low Arbitrarily downgrade VGT blade opening LVGT；

2. BP neural network ANN prediction model, including input layer, hidden layer and output layer are established, with diesel engine speed, spray Oil mass, injection advance angle, hiigh pressure stage VGT blade opening HVGT and low-pressure stage VGT blade opening LVGT are input layer, to optimize mesh Mark torque Ttq, fuel consumption rate BSFC, NOx, CO and PM are output layer, using the GT-POWER software work process after check Simulation model calculates data and is trained to ANN, and is assessed using actual diesel engine test data ANN model；

3. population PSO multi-objective optimization algorithm is subjected to combined optimization in conjunction with neural network ANN, ANN model is pre- Measured value is as optimization sample, Optimal Parameters are as follows: Fuel Injection Quantity for Diesel, injection advance angle, HVGT and LVGT, optimization aim are as follows: turns Square Ttq, fuel consumption rate BSFC, NOx, CO and PM, constraint condition include: maximum combustion pressure, maximum combustion temperature, whirlpool front row Temperature, compressor surge line, secondary speed, minimum PM,

PSO fitness function indicates are as follows:

Wherein, w₁、w₂、w₃、w₄And w₅Respectively torque (Torque), specific oil consumption (BSFC), NOx, CO and PM weight.

The present invention has the advantage that and good effect:

1, the present invention establishes second level adjustable pressurization system and the more control parameter Nonlinear A NN prediction moulds of oil common rail system Type, combining adaptive samples PSO global optimization approach, to pressurization control parameter (HVGT, LVGT, boost pressure) and fuel injection parameter (distributive value and injection advance angle) carries out dynamic, multi-parameters optimization.

2, the present invention should be optimal tracking target so that boost pressure is adaptive, and it is optimal to design double VGT second level adjustable pressurization systems Non-linear mould predictive (NMPC) control algolithm is separately designed for diesel altitude-variable steady state condition and transient condition feature Double VGT pressure charging systems and oil common rail system become height above sea level coordination control strategy.

Detailed description of the invention

Fig. 1 show the double VGT second level adjustable pressurization systems of diesel engine of the invention and cooperates with optimization ANN with oil common rail system Model；

Fig. 2 show diesel altitude-variable multiple target mixing ANN-PSO optimized flow chart of the invention；

Fig. 3 show double VGT second level adjustable pressurization system control system theory of constitution figures of the invention；

Fig. 4 show the double VGT second level adjustable pressurization systems of diesel engine of the present invention and oil common rail system collaborative controller knot Structure arrangement.

Specific embodiment

The present invention is described in further detail below in conjunction with the drawings and specific embodiments.It should be appreciated that described herein Specific examples are only used to explain the present invention, is not intended to limit the present invention.

A kind of double VGT second level adjustable pressurization systems of diesel engine and oil common rail system become height above sea level cooperative control method, including Diesel altitude-variable multiple target, multi-parameters optimization algorithm and double VGT second level adjustable pressurization systems and fuel common-rail spraying system are assisted Same control method；Wherein:

The diesel altitude-variable multiple target, multi-parameters optimization algorithm, include the following steps:

1, determine diesel altitude-variable performance optimization aim and control parameter: optimization aim includes torque Ttq, fuel consumption Rate BSFC, NOx, CO and PM；Optimal control parameter includes distributive value, injection advance angle, hiigh pressure stage VGT blade opening HVGT, low Arbitrarily downgrade VGT blade opening LVGT；

2, as shown in Figure 1, the double VGT second level adjustable pressurization systems of diesel engine of the present invention cooperate with optimization with oil common rail system ANN model is made of input layer, hidden layer and output layer.Wherein diesel engine speed, distributive value, injection advance angle, boost pressure and Intake air temperature as neural network input layer, middle layer as hidden layer, fuel consumption rate (BSFC), torque (Torque), NOx, CO and PM are as output layer.ANN model is trained by the data that GT-POWER software calculates, consider model emulation with The otherness of actual conditions needs to be verified with experimental data before carrying out diesel altitude-variable multi-parameters optimization with ANN model The accuracy of ANN model prediction real engine performance.

It 3, will as shown in Fig. 2, population PSO multi-objective optimization algorithm is carried out combined optimization in conjunction with neural network ANN ANN model predicted value is as optimization sample, Optimal Parameters are as follows: Fuel Injection Quantity for Diesel, injection advance angle, HVGT and LVGT, optimization Target are as follows: torque Ttq, fuel consumption rate BSFC, NOx, CO and PM, constraint condition include: maximum combustion pressure, highest burning temperature Degree, whirlpool front-seat temperature, compressor surge line, secondary speed, minimum PM.

PSO fitness function indicates are as follows:

Wherein, w₁、w₂、w₃、w₄And w₅Respectively torque (Torque), specific oil consumption (BSFC), NOx, CO and PM weight.

Double VGT second level adjustable pressurization systems and fuel common-rail spraying system cooperative control method are Collaborative Control oil spouts Parameter, i.e. distributive value and injection advance angle and boost pressure regulation parameter, i.e. hiigh pressure stage VGT blade opening HVGT, low-pressure stage VGT blade Aperture LVGT improves under diesel engine high conditions " oil-gas-room " and matches；

1) nonlinear model is designed using MATLAB multi-parameters optimization tool box (Multi-Parametric Toolbox) PREDICTIVE CONTROL (NMPC) algorithm, is based on each sampling instant, and NMPC is intended to one non-linear optimal problem of processing, it may be assumed that

Constraint condition:

Stage and ultimate cost are respectively defined as:

Indicate differential state,Indicate differential state derivative, algebraic variable Input variable is controlled,Indicate control input variable derivative；NMPC optimum control is decided by Current state estimated value is indicated according to formula (2) initial value condition.NMPC optimum control tracks cost function by least square method Composition, including formula (1), (8) and (9).Optimization constraint condition includes formula (4) to (7).

As shown in figure 3, the double VGT second level adjustable pressurization system control system theory of constitution figures of the present invention are by sensor, automatically controlled Unit and actuator composition.State parameter is divided into three categories, comprising: inlet condition, environmental parameter and engine operating parameter.It passes Sensor group acquisition state parameter is to electronic control unit, and microprocessor (TCU) compares actual value and optimization calibration value, according to the non-of design Linear Model for Prediction controls (NMPC) algorithm output signal, driving actuator work.

As shown in figure 4, the double VGT second level adjustable pressurization systems of diesel engine of the present invention and oil common rail system collaborative controller by Double VGT second level adjustable supercharging controllers and fuel injection parameter controller composition, under high conditions, use adjustable with double VGT second levels Booster becomes based on height above sea level control, the Collaborative Control principle of oil spout altitude-compensation.

In figure, judge that diesel engine working condition is steady state condition or transient state work according to diesel engine speed and load first Condition selects corresponding pressure charging system opened loop control, closed loop control module.Become height above sea level boost pressure and charge flow rate control basis On, diesel engine ECU, which is received, comes from diesel engine speed and load signal (Fig. 4), and inquiry obtains initial fuel injection parameter Maipu (MAP), And be modified according to height above sea level signal (atmospheric pressure and atmospheric temperature) MAP initial to fuel injection parameter, target fuel injection parameter is obtained, Opened loop control oil common rail system fuel injection parameter signal.

Double VGT second level adjustable pressurization systems and fuel common-rail spraying system cooperative control method of the invention are Collaborative Control sprays Oily parameter, i.e. distributive value and injection advance angle and boost pressure regulation parameter, i.e. hiigh pressure stage VGT blade opening HVGT, low-pressure stage VGT leaf Piece aperture LVGT improves under diesel engine high conditions " oil-gas-room " and matches, and double VGT second level adjustable supercharging control units receive bavin Oil machine revolving speed and load signal (shown in Fig. 3) first determine whether that the working condition of diesel engine is steady state condition or transient condition.If Diesel engine works in steady state condition, and using feedback control module (Fig. 4), microprocessor (Fig. 3) is inquired high/low compressor of arbitrarily downgrading and gone out Mouthful initial Maipu of optimum pressure (MAP), and height above sea level (atmospheric pressure and temperature) signal based on the received, to initial pressure MAP into Row amendment, obtains target boost pressure MAP, compared with boost pressure and charge flow rate actual feedback signal (Fig. 4), according to model PREDICTIVE CONTROL (MPC) method controls high and low VGT blade opening of arbitrarily downgrading.If diesel engine works in transient condition, using feedforward control Module (Fig. 4), electronic control unit microprocessor are inquired high/low according to the diesel engine speed, load, atmosphere pressure signal received Arbitrarily downgrade the best MAP of VGT blade opening, and power driver module output executes signal, directly controls high and low VGT blade of arbitrarily downgrading to mesh Mark aperture.

Diesel engine ECU, which is received, comes from diesel engine speed and load signal (Fig. 4), and inquiry obtains initial fuel injection parameter Maipu (MAP), it and according to height above sea level signal (atmospheric pressure and atmospheric temperature) MAP initial to fuel injection parameter is modified, obtains target spray Oily parameter, opened loop control oil common rail system fuel injection parameter signal.

The above is only a preferred embodiment of the present invention, it is noted that for the common skill of the art For art personnel, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications Also it should be regarded as protection scope of the present invention.