CN109854394A - Become the double VGT second level adjustable supercharging control methods of height above sea level - Google Patents
Become the double VGT second level adjustable supercharging control methods of height above sea level Download PDFInfo
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- CN109854394A CN109854394A CN201711235398.7A CN201711235398A CN109854394A CN 109854394 A CN109854394 A CN 109854394A CN 201711235398 A CN201711235398 A CN 201711235398A CN 109854394 A CN109854394 A CN 109854394A
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- 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
- F02B37/24—Control of the pumps by using pumps or turbines with adjustable guide vanes
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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
- F02D23/00—Controlling engines characterised by their being supercharged
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- 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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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
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Abstract
一种变海拔双VGT二级可调增压控制方法，柴油机ECU根据进气温度、压力和柴油机工况查询存储初始增压压力MAP，经过进气温度传感器对初始增压压力MAP进行修正得到目标增压压力MAP，并将数字信号经驱动电路转化为低压级VGT执行器、高压级VGT执行器和高压级涡轮旁通阀执行器的执行电信号，使低压级VGT执行器、高压级VGT执行器和高压级涡轮旁通阀执行器内的微控制器根据目标增压压力和其反馈的实际增压压力差值，实时调整高压级压气机旁通阀开度位置、高压级涡轮旁通阀开度位置和高、低压级VGT叶片的开度位置。该方法使柴油机ECU根据海拔和工况的变化，动态控制双VGT二级可调增压系统的增压压力和进气流量，实现在0m～5500m海拔范围内，柴油机功率不降低的目标。
A variable-altitude dual-VGT two-stage adjustable supercharging control method. The diesel engine ECU queries and stores the initial supercharging pressure MAP according to the intake air temperature, pressure and diesel engine operating conditions, and corrects the initial supercharging pressure MAP through an intake temperature sensor to obtain a target. Boost pressure MAP, and convert the digital signal into the execution electrical signal of the low pressure stage VGT actuator, the high pressure stage VGT actuator and the high pressure stage turbine bypass valve actuator through the drive circuit, so that the low pressure stage VGT actuator and the high pressure stage VGT actuator are executed. The microcontroller in the actuator and the high-pressure stage turbine bypass valve actuator adjusts the opening position of the high-pressure stage compressor bypass valve and the high-pressure stage turbine bypass valve in real time according to the target boost pressure and the actual boost pressure difference value fed back by it. The opening position and the opening position of the high and low pressure stage VGT vanes. The method enables the diesel engine ECU to dynamically control the boost pressure and intake air flow of the dual VGT two-stage adjustable supercharging system according to changes in altitude and working conditions, so as to achieve the goal of not reducing the power of the diesel engine within the altitude range of 0m to 5500m.
Description
Technical field
The present invention relates to technical field of engines, more particularly to a kind of double VGT second level adjustable supercharging controlling parties of change height above sea level
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.According to statistics, height above sea level every raising 1000m engine power performance decline 4.0%~13.0%, economy decline 2.7%~
12.9%, the front-seat mild cylinder cap temperature in whirlpool increases 7%~10%.In addition, under the conditions of becoming height above sea level variable working condition, diesel engine supercharging system
System belongs to combustion chamber to be pneumatically connected, and has the characteristics that non-linear, close coupling, multiple constraint, double VGT second level adjustable supercharging controls system
System system can improve diesel oil under Different Altitude according to the variation of height above sea level and operating condition, real-time control boost pressure and charge flow rate
The density of the induced air of machine, it is ensured that air-fuel ratio is best in cylinder, realizes the mesh that height above sea level 5500m diesel engine power does not reduce compared with 0m height above sea level
Mark.
Summary of the invention
The technological deficiency of height above sea level and operating condition variation is not adapted to for existing diesel pressure charging system, the present invention designs one kind
Become the double VGT second level adjustable supercharging control methods of height above sea level, this method makes diesel engine ECU according to the variation of height above sea level and operating condition, and dynamic is controlled
The boost pressure and charge flow rate for making double VGT second level adjustable pressurization systems, realize the diesel engine in 0m~5500m altitude ranges
The target that power does not reduce.
The technical solution adopted to achieve the purpose of the present invention is:
A kind of double VGT second level adjustable supercharging control methods of change height above sea level, hiigh pressure stage VGT and low-pressure stage VGT arranged in series.Diesel oil
Machine ECU inquires storing initial boost pressure MAP according to intake air temperature, pressure and diesel engine condition, by intake air temperature sensor
Initial pressurization pressure MAP is modified to obtain target boost pressure MAP, and converts low pressure through driving circuit for digital signal
The execution electric signal of grade VGT actuator, hiigh pressure stage VGT actuator and hiigh pressure stage turbine by-pass valve actuator, holds low-pressure stage VGT
Microcontroller in row device, hiigh pressure stage VGT actuator and hiigh pressure stage turbine by-pass valve actuator is according to target boost pressure and its
The actual supercharge pressure difference of feedback adjusts hiigh pressure stage compressor by-passing valve open position in real time, hiigh pressure stage turbine bypass valve is opened
The open position of position and high and low VGT blade of arbitrarily downgrading is spent, and these open positions are fed back to ECU and are controlled, so that pressurization
Pressure is optimal.
Microcontroller in above-mentioned low-pressure stage VGT actuator, hiigh pressure stage VGT actuator and hiigh pressure stage turbine by-pass valve actuator
The control method of device is: hall position information is converted by target boost pressure signal first, then according to current hall position
Information judges motor direction of rotation, and determines PWM duty cycle according to physical location and target position, controls motor by actuator
Reach target position；In program PWM duty cycle using dynamic control, motor during the motion, if target boost pressure compared with
Greatly, respective springs time positive force is bigger, and PWM duty cycle is also bigger；When position is smaller, spring time positive force is smaller, PWM duty cycle
It is less than normal；The size of PWM duty cycle equally should be also determined according to practical valve location when motor is in holding position.
Above-mentioned electronic control unit ECU to receive low-pressure stage compressor bypass valve position signal, hiigh pressure stage turbine bypass valve
The open position signal of position signal and high and low VGT blade of arbitrarily downgrading carries out feedforward control.
Above-mentioned electronic control unit ECU is to the low-pressure stage compressor by-passing valve open position signal received, by hiigh pressure stage turbine
The open position signal of port valve open position signal and high and low VGT blade of arbitrarily downgrading carries out closed loop feedback control.
The present invention is under the conditions of Different Altitude, by adjusting high and low VGT blade of arbitrarily downgrading, hiigh pressure stage turbine by-pass valve opening
And the opening and closing of low-pressure stage compressor by-passing valve guarantees overall performance.It is up to optimization aim with dynamic property, according to demarcating
The boost pressure and VGT blade opening MAP arrived adjusts the aperture of hiigh pressure stage VGT blade and low-pressure stage VGT blade.With revolving speed
Increase, hiigh pressure stage turbine overtemperature, hypervelocity, hiigh pressure stage turbine regulating valve are opened and adjusted in order to prevent.Meanwhile transient state in order to prevent
Boost pressure and torque bust under operating condition, real-time control hiigh pressure stage compressor by-passing valve start-up time and duration.
Detailed description of the invention
Fig. 1 is the double VGT second level adjustable supercharging control system schematic diagrames of change height above sea level of the invention；
Fig. 2 is actuator position control strategy of the invention；
Fig. 3 is actuator software flow pattern；
Fig. 4 is a kind of control mode functional block diagram of the present invention；
Fig. 5 is another control mode functional block diagram of the present invention；
Fig. 6 is double VGT second level adjustable pressurization system execution flow charts；
Table 1 is Different Altitude second level adjustable pressurization system control strategy.
In figure: 1 --- diesel engine；2 --- intercooler after hiigh pressure stage；3 --- temperature sensor I；4 --- pressure sensor
I；5 --- hiigh pressure stage compressor；6 --- hiigh pressure stage VGT；7 --- temperature sensor II；8 --- pressure sensor II；9——
Low-pressure stage intercooler；10 --- low-pressure stage compressor；11 --- low-pressure stage VGT；12 --- intake air temperature sensor III；
13 --- air inlet pressure sensor III；14 --- low-pressure stage VGT actuator；15 --- temperature sensor before hiigh pressure stage whirlpool；
16 --- pressure sensor before hiigh pressure stage whirlpool；17 --- hiigh pressure stage turbine；18 --- hiigh pressure stage VGT blade；19 --- hiigh pressure stage
Turbine speed sensor；20 --- temperature sensor before low-pressure stage whirlpool；21 --- pressure sensor before low-pressure stage whirlpool；22 --- it is low
It arbitrarily downgrades VGT blade；23 --- lower pressure stage turbine speed probe；24 --- hiigh pressure stage compressor by-passing valve；25 --- hiigh pressure stage
Turbine bypass valve；26 --- diesel engine speed sensor；27 --- diesel engine throttle pedal position sensor；28 --- temperature is adopted
Truck；29 --- pressure acquisition card；30 --- hiigh pressure stage VGT blade actuator；31 --- diesel engine ECU, 32 --- hiigh pressure stages
Turbine by-pass valve actuator.
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.
Increased as shown in Figure 1, the present invention becomes the double VGT second level adjustable supercharging control systems of height above sea level by diesel-engine body 1, double VGT
Depressor 6 and 11, ECU31, actuator (14,30,32), temperature and pressure sensor (3,4,7,8,12,13,15,16,20,21)
Deng composition.Height is respectively set after high and low grade compressor by hiigh pressure stage VGT6 and low-pressure stage VGT11 arranged in series in double VGT boosters
Intercooler (9) after intercooler (2) and low-pressure stage after arbitrarily downgrading, diesel engine ECU31 is according to receiving diesel engine speed sensor (26), oil
Door position sensor (27) and air inlet pressure sensor (13) inquire storing initial boost pressure MAP, by air-temperature sensing
Device (12) is modified initial MAP to obtain target boost pressure MAP, converts actuator for digital signal through overdrive circuit
The execution signal of (14,30,32) drives high and low VGT blade of arbitrarily downgrading (18,22) and hiigh pressure stage compressor by-passing valve, hiigh pressure stage whirlpool
By-passing valve (24,25) aperture is taken turns, pressure charging system actuator (14,30,32) interior microcontroller is according to target boost pressure and reality
Boost pressure difference adjusts hiigh pressure stage compressor by-passing valve (24), hiigh pressure stage turbine bypass valve (25) in real time and high and low arbitrarily downgrades
The aperture of VGT blade (18,22).
The present invention becomes the double VGT second level adjustable supercharging control system block diagrams of height above sea level, is mainly adopted by electronic control unit (ECU), data
Collect module and Electric Actuator three parts composition.
As shown in Figure 2,3, actuator position control strategy of the present invention is: first converting target boost pressure signal to suddenly
That location information, then judges motor direction of rotation according to current hall position information, and according to physical location and target position
It determines PWM duty cycle, motor is controlled by actuator and reaches target position；PWM duty cycle is controlled using dynamic in program, motor
During the motion, if target boost pressure is larger, respective springs time positive force is bigger, and PWM duty cycle is also bigger；When position compared with
Hour, spring time positive force is smaller, and PWM duty cycle is also less than normal；It equally also should be according to practical valve position when motor is in holding position
Set the size to determine PWM duty cycle.
According to test, in the process of running, duty ratio is between 30%~55%, and motor is in holding position for motor at present
In the process, duty ratio is between 10%~17%.
Shown in table 1, under the conditions of Different Altitude, by adjusting VGT blade, turbine control valve opening and compressor by-passing valve
Opening and closing guarantee overall performance.It is up to optimization aim with dynamic property, is opened according to boost pressure obtained by calibrating and VGT blade
MAP is spent, the aperture of hiigh pressure stage VGT blade and low-pressure stage VGT blade is adjusted.As revolving speed increases, hiigh pressure stage turbine in order to prevent
Overtemperature, hypervelocity, hiigh pressure stage turbine regulating valve are opened and are adjusted.Meanwhile boost pressure and torque are prominent under transient condition in order to prevent
Drop, real-time control hiigh pressure stage compressor by-passing valve start-up time and duration.
As shown in figure 4, the double VGT second level two kinds of embodiments of adjustable pressurization system of the present invention.The control of the first embodiment
Device receives each sensor information of acquisition, determines preliminary aim pressurization value according to engine speed and throttle position first, connects
By barometric pressure sensor, atmosphere temperature transducer and throttle position change sensor variation determine whether be added transient state repair
Positive value, sum of the two is as final target supercharge value；Then according to current booster pressure value, hiigh pressure stage VGT and low is determined
It arbitrarily downgrades VGT leaf position, which passes through pid control algorithm and realize.Pid algorithm occurs under transitory operating condition in order to prevent
Oscillatory occurences avoids torque bust, compressor surge, and feedforward control adjustment is added, guarantees transient control effect.
Second of embodiment of the invention is booster and individual positioner is integrated into one, independent to become one
A system, specific implementation principle are as shown in Figure 5.Positional servosystem itself complete VGT blade and bypass valve position feedback close
Ring control.Positional servosystem receives the control command signal of extraneous (usually engine control system ECU), the control signal
Indicate that VGT blade and by-passing valve need target position to be achieved, positional servosystem realizes waste gate self by closed-loop control
Reach target corresponding position.In other words, positional servosystem itself is position feedback closed loop controller, the closed-loop control of pressure
It is realized by engine control system ECU.The benefit of this kind of implementation is, booster and adjust unit be it is integrated, can be with
It is made into supercharger systems module, convenient for being integrated with other engine control systems, interface is simple.
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.
Claims (4)
1. a kind of double VGT second level adjustable supercharging control methods of change height above sea level, hiigh pressure stage VGT and low-pressure stage VGT arranged in series, feature
Be: diesel engine ECU inquires storing initial boost pressure MAP according to intake air temperature, pressure and diesel engine condition, by air inlet temperature
Degree sensor is modified initial pressurization pressure MAP to obtain target boost pressure MAP, and digital signal is turned through driving circuit
The execution electric signal for turning to low-pressure stage VGT actuator, hiigh pressure stage VGT actuator and hiigh pressure stage turbine by-pass valve actuator, makes low
The microcontroller arbitrarily downgraded in VGT actuator, hiigh pressure stage VGT actuator and hiigh pressure stage turbine by-pass valve actuator is according to target supercharge
The actual supercharge pressure difference of pressure and its feedback adjusts hiigh pressure stage compressor by-passing valve open position, hiigh pressure stage turbine in real time
The open position of by-passing valve open position and high and low VGT blade of arbitrarily downgrading, and these open positions are fed back to ECU and are controlled,
So that boost pressure is optimal.
2. the double VGT second level adjustable supercharging control methods of change height above sea level according to claim 1, it is characterised in that: above-mentioned low pressure
The control method of grade VGT actuator, hiigh pressure stage VGT actuator and the microcontroller in hiigh pressure stage turbine by-pass valve actuator is:
Hall position information is converted by target boost pressure signal first, then judges that motor rotates according to current hall position information
Direction, and PWM duty cycle is determined according to physical location and target position, motor is controlled by actuator and reaches target position；Journey
PWM duty cycle is controlled using dynamic in sequence, and motor during the motion, if target boost pressure is larger, return just by respective springs
Power is bigger, and PWM duty cycle is also bigger；When position is smaller, spring time positive force is smaller, and PWM duty cycle is also less than normal；When motor is being protected
The size of PWM duty cycle equally should be also determined when holding position according to practical valve location.
3. the double VGT second level adjustable supercharging control methods of change height above sea level according to claim 1, it is characterised in that: above-mentioned automatically controlled
Unit diesel engine ECU to receive low-pressure stage compressor bypass valve position signal, hiigh pressure stage turbine by-pass valve position signal and
The open position signal of high and low VGT blade of arbitrarily downgrading carries out feedforward control.
4. the double VGT second level adjustable supercharging control methods of change height above sea level according to claim 1, it is characterised in that: above-mentioned diesel oil
Machine ECU to receive low-pressure stage compressor by-passing valve open position signal, hiigh pressure stage turbine bypass valve open position signal and
The open position signal of high and low VGT blade of arbitrarily downgrading carries out closed loop feedback control.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711235398.7A CN109854394A (en) | 2017-11-30 | 2017-11-30 | Become the double VGT second level adjustable supercharging control methods of height above sea level |
| PCT/CN2018/103190 WO2019105080A1 (en) | 2017-11-30 | 2018-08-30 | Variable altitude double-vgt two-stage adjustable boost control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711235398.7A CN109854394A (en) | 2017-11-30 | 2017-11-30 | Become the double VGT second level adjustable supercharging control methods of height above sea level |
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| CN109854394A true CN109854394A (en) | 2019-06-07 |
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| CN201711235398.7A Pending CN109854394A (en) | 2017-11-30 | 2017-11-30 | Become the double VGT second level adjustable supercharging control methods of height above sea level |
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| WO (1) | WO2019105080A1 (en) |
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| CN111076941A (en) * | 2019-12-30 | 2020-04-28 | 中国人民解放军陆军军事交通学院 | double-VGT two-stage adjustable supercharger test system |
| CN111911301A (en) * | 2020-06-24 | 2020-11-10 | 中国人民解放军陆军军事交通学院 | Method for optimizing VGT (variable gradient turbine) blade path of double-VGT two-stage adjustable supercharging system under transient working condition of variable-altitude diesel engine |
| CN111911300A (en) * | 2020-06-24 | 2020-11-10 | 中国人民解放军陆军军事交通学院 | Method for optimizing control path of two-stage adjustable supercharging system VGT (variable gradient turbine) blade under transient working condition of variable-altitude diesel engine |
| CN114135405A (en) * | 2021-11-19 | 2022-03-04 | 中国北方发动机研究所(天津) | Open-loop control method for gas circuit two-stage supercharging system of high-pressure common-rail diesel engine |
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| CN115977792A (en) * | 2023-02-17 | 2023-04-18 | 长城汽车股份有限公司 | Engine control method, device, vehicle and computer storage medium |
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