CN111911302A - Control method of variable-altitude double-VGT two-stage adjustable supercharging system - Google Patents

Control method of variable-altitude double-VGT two-stage adjustable supercharging system Download PDF

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Publication number
CN111911302A
CN111911302A CN202010595136.7A CN202010595136A CN111911302A CN 111911302 A CN111911302 A CN 111911302A CN 202010595136 A CN202010595136 A CN 202010595136A CN 111911302 A CN111911302 A CN 111911302A
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pressure
altitude
diesel engine
vgt
lvgt
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CN202010595136.7A
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Chinese (zh)
Inventor
刘瑞林
张众杰
丁豪坚
董素荣
周广猛
杨春浩
焦宇飞
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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
    • F02D23/00—Controlling engines characterised by their being supercharged
    • F02D23/02—Controlling engines characterised by their being supercharged the engines being of fuel-injection type
    • 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
    • F02B37/24—Control of the pumps by using pumps or turbines with adjustable guide vanes
    • 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
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/04—Engine intake system parameters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/04—Engine intake system parameters
    • F02D2200/0404—Throttle position
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
    • F02D2200/101—Engine speed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/70—Input parameters for engine control said parameters being related to the vehicle exterior
    • F02D2200/701—Information about vehicle position, e.g. from navigation system or GPS signal
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/70—Input parameters for engine control said parameters being related to the vehicle exterior
    • F02D2200/703—Atmospheric pressure
    • 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)
  • Supercharger (AREA)

Abstract

The invention provides a control method of a variable-altitude double-VGT two-stage adjustable supercharging system, which comprises a variable nozzle section high-pressure stage supercharger (HVGT) and a variable nozzle section low-pressure stage supercharger (LVGT) which are connected in series, an Electric Control Unit (ECU) and an electric control actuator. Under different altitudes and diesel engine working conditions, the diesel engine ECU determines target altitude, low-pressure VGT blade opening and supercharging pressure signals according to altitude, rotating speed and accelerator opening signals and outputs the signals to a supercharging system controller (TCU), and the TCU outputs control signals to an electric control actuator by combining received actual supercharging pressure and target value signals to realize closed-loop control of the high-pressure VGT blade opening and the low-pressure VGT blade opening. The HVGT and LVGT blade opening degree can be adjusted according to the change of the altitude and the working condition of the engine so as to achieve the aim that the power of the engine is recovered to the standard point of 90 percent of the plain condition at the standard point of the altitude 5500 m.

Description

Control method of variable-altitude double-VGT two-stage adjustable supercharging system
Technical Field
The invention relates to the technical field of engines, in particular to a control method of a variable-altitude double-VGT two-stage adjustable supercharging system.
Background
As the altitude increases, the atmospheric pressure decreases and the engine power decreases. In order to enable the recovery power of the engine to reach the target of 90% of the plain power at the height of 5500m, the pressure ratio of the compressor is at least more than 4.8 in the interval from the maximum torque point to the calibration point. If a single-stage supercharging scheme is adopted, no compressor can meet the requirements of high pressure ratio and high flow range in the world at present, and therefore two-stage adjustable supercharging is required.
However, most of the existing two-stage supercharging control systems aim at all working conditions of fixed altitude and have large altitude difference in different regions, when the two-stage supercharging design matching point is selected as an engine in a plain region, the air density is rapidly reduced when the engine runs in the plateau region, and the power of the engine is correspondingly reduced. When the engine in the plateau area is selected as the matching point of the two-stage supercharging design, the emission performance of the low-speed section of the engine is difficult to ensure when the engine runs in the plateau area.
Disclosure of Invention
Aiming at the technical defects of the existing two-stage supercharging system, the control method of the variable-altitude double-VGT two-stage adjustable supercharging system provided by the invention can adjust the opening degrees of the HVGT and LVGT blades according to the change of the altitude and the working condition of the engine so as to achieve the aim that the power of the engine is recovered to a plain condition calibration point of 90% at an altitude 5500m calibration point.
The technical problem to be solved by the invention is realized by adopting the following technical scheme:
a control method of a variable-altitude double-VGT two-stage adjustable supercharging system is characterized by comprising the following steps of: the variable nozzle section high-pressure supercharger (HVGT), the variable nozzle section low-pressure supercharger (LVGT), an Electric Control Unit (ECU) and an electric control actuator (TCU) are included, the diesel engine, the variable nozzle section high-pressure supercharger (HVGT) and the variable nozzle section low-pressure supercharger (LVGT) are connected in series, the diesel engine is provided with an accelerator position sensor and a rotating speed sensor which are connected with the Electric Control Unit (ECU) through data lines, the Electric Control Unit (ECU) is connected with the electric control actuator (TCU), and the data lines of the electric control actuator (TCU) are respectively connected with the variable nozzle section high-pressure supercharger (HVGT) and the variable nozzle section low-pressure supercharger (LVGT) to send control signals; an Electronic Control Unit (ECU) is provided with an atmospheric pressure and temperature sensor for detecting the current altitude working condition in real time; the air inlet pipe and the air outlet pipe of the diesel engine are both provided with a supercharging pressure sensor and a temperature sensor; a supercharging pressure sensor is arranged at the air inlet end of the variable nozzle section high-pressure stage supercharger; the exhaust end of the high-pressure stage supercharger with the variable nozzle section is provided with a pressure sensor in the vortex, the supercharging pressure and temperature sensor, the supercharging pressure sensor and the pressure sensor in the vortex are respectively connected with an electric control actuator (TCU), and the actual supercharging pressure information of each part is sent to the electric control actuator (TCU);
under different altitudes and diesel engine working conditions, a control program is installed in a diesel engine ECU, the diesel engine ECU control program determines target value signals of the opening degrees of high-pressure and low-pressure VGT blades and boost pressure according to altitude, rotating speed and throttle opening degree signals, the target value signals are output to a boost system controller (TCU), and the TCU outputs control signals to an electric control actuator by combining received actual boost pressure and the target value signals, so that closed-loop control of the opening degrees of the high-pressure and low-pressure VGT blades is realized, and the diesel engine performance recovery target under different altitudes and working conditions is reached.
The flow of the diesel engine ECU control program is as follows: starting to read a boost pressure MAP signal, judging whether MAP rises or not according to atmospheric pressure and working condition changes, judging whether HVGT is fully opened or not if the boost pressure MAP rises, and increasing HVGT blades if the boost pressure MAP does not fully open; if the LVGT is fully opened, judging whether the LVGT is fully opened or not, and if not, increasing the opening of the LVGT; if the switch is fully opened, the program is ended; if the boost pressure MAP is lowered, it is determined whether the HVGT is fully closed, if so, it is determined that the LVGT is fully closed, and if so, the full-closing procedure is ended.
Also, diesel engine performance recovery objectives: the partial load condition is targeted at the optimum fuel consumption rate, and the full load condition is targeted at the maximum dynamic performance.
Moreover, under the working condition that the altitude is less than 3500m, the high-pressure-stage supercharger works, and the LVGT blades are fully opened to reduce exhaust resistance; under the working condition that the altitude is 3500 m-5500 m, the opening degree of the LVGT blades is gradually reduced, the two-stage superchargers are all put into operation, the air inlet pressure and the air inlet flow of the diesel engine are improved, the high-pressure VGT blades and the low-pressure VGT blades adjust the air inlet flow and the air inlet pressure of the diesel engine in real time, and the requirement of the diesel engine for self-adaption under the full working condition with variable altitude is met.
The invention has the advantages and positive effects that:
the invention establishes a self-adaptive control strategy for the supercharging pressure of a double-VGT two-stage adjustable supercharging system under the three-dimensional coordinates of altitude, diesel engine rotating speed and load. Under different altitude environments, the partial load working condition aims at the optimal fuel consumption rate, and the full load working condition aims at the maximum dynamic property. Based on the diesel engine performance recovery targets under different altitudes and working conditions, the self-adaptive control strategy of the supercharging pressure of the double-VGT two-stage adjustable supercharging system under different altitudes is designed by combining the regulation rules of the prior high-pressure VGT blades and the low-pressure VGT blades on the exhaust energy and distribution.
Drawings
FIG. 1 is a schematic structural diagram of a variable-altitude dual-VGT two-stage adjustable supercharging system according to the present invention;
FIG. 2 is a flow chart illustrating control of the variable-altitude dual VGT two-stage adjustable boosting system of the present invention;
FIG. 3 shows the variable altitude high and low pressure stage VGT vane opening degree full condition control strategy of the present invention.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention relates to a control method of a variable-altitude double-VGT (variable-pressure variable-geometry) two-stage adjustable supercharging system, as shown in figure 1, the variable-altitude double-VGT two-stage adjustable supercharging system comprises a variable-nozzle-section high-pressure-stage supercharger (HVGT), a variable-nozzle-section low-pressure-stage supercharger (LVGT), an Electronic Control Unit (ECU) and an electronic control actuator (TCU), wherein a diesel engine, the variable-nozzle-section high-pressure-stage supercharger (HVGT) and the variable-nozzle-section low-pressure-stage supercharger (LVGT) are connected in series, the diesel engine is provided with an accelerator position sensor and a rotating speed sensor which are connected with the Electronic Control Unit (ECU) through data lines, the Electronic Control Unit (ECU) is connected with the electronic control actuator (TCU), and the data lines of the electronic control actuator (TCU) are respectively connected with the;
an Electronic Control Unit (ECU) is provided with an atmospheric pressure and temperature sensor for detecting the current altitude working condition in real time;
the air inlet pipe and the air outlet pipe of the diesel engine are both provided with a supercharging pressure sensor and a temperature sensor; a supercharging pressure sensor is arranged at the air inlet end of the variable nozzle section high-pressure stage supercharger; the exhaust end of the high-pressure stage supercharger with the variable nozzle section is provided with a pressure sensor in the vortex, the supercharging pressure and temperature sensor, the supercharging pressure sensor and the pressure sensor in the vortex are respectively connected with an electric control actuator (TCU), and the actual supercharging pressure information of each part is sent to the electric control actuator (TCU).
Under different altitudes and diesel engine working conditions, a control program is installed in a diesel engine ECU, the diesel engine ECU determines target value signals of the opening degrees of high-pressure and low-pressure VGT blades and the boost pressure according to altitude, rotating speed and throttle opening degree signals, the target value signals are output to a boost system controller (TCU), and the TCU outputs control signals to an electric control actuator by combining received actual boost pressure and the target value signals, so that closed-loop control of the opening degrees of the high-pressure and low-pressure VGT blades is realized.
As shown in fig. 2, in the control flow chart of the variable altitude dual VGT two-stage adjustable supercharging system of the invention, a control program starts to read a supercharging pressure MAP signal, judges whether MAP is increased according to atmospheric pressure and working condition changes, and judges whether HVGT is fully opened if the supercharging pressure MAP is increased, and increases HVGT blades if the supercharging pressure MAP is not fully opened; if the LVGT is fully opened, judging whether the LVGT is fully opened or not, and if not, increasing the opening of the LVGT; if the switch is fully opened, the program is ended; if the boost pressure MAP is lowered, it is determined whether the HVGT is fully closed, if so, it is determined that the LVGT is fully closed, and if so, the full-closing procedure is ended.
The partial load condition is targeted at the optimum fuel consumption rate, and the full load condition is targeted at the maximum dynamic performance.
Based on the diesel engine performance recovery targets under different altitudes and working conditions, the self-adaptive control strategy of the supercharging pressure of the double-VGT two-stage adjustable supercharging system under different altitudes is designed by combining the regulation rules of the prior high-pressure VGT blades and the low-pressure VGT blades on the exhaust energy and distribution.
As shown in Table 1, the two-stage adjustable boost system control strategy for different altitudes of the present invention. At low altitude conditions (<3500m), the high pressure stage supercharger operates with the LVGT vanes fully open to reduce exhaust resistance. Under high altitude (3500 m-5500 m), the opening degree of the LVGT blades is gradually reduced, and the two-stage superchargers are all put into operation, so that the intake pressure and the intake flow of the diesel engine are improved. The high-pressure and low-pressure VGT vanes adjust the air inlet flow and the air inlet pressure of the diesel engine in real time, and the requirement of the diesel engine for altitude-variable full-working-condition self-adaption is met.
TABLE 1 two-stage adjustable supercharging system control strategy for different altitudes
Figure BDA0002554244520000031
Figure BDA0002554244520000041
As shown in FIG. 3, the variable-altitude high-pressure stage and low-pressure stage VGT vane opening degree full-operating-condition control strategy of the invention is adopted. Under the two load conditions of 20% and 100% of the diesel engine, the full-condition control strategy of the double-VGT two-stage adjustable supercharging system is shown in figure 3. And giving a control strategy of the two-stage supercharger for changing the altitude and the working condition from the aspects of the efficiency of the high-low pressure stage supercharger and the power distribution of the turbine, and adjusting the opening degree proportion of the high-low pressure stage VGT under different working conditions and the altitude. Under the partial load low-speed working condition, the exhaust energy is low, the HVGT independent working area is large, the switching rotating speed of the HVGT and LVGT combined working is 1200r/min, under the full load working condition, the HVGT independent working range is reduced, the switching rotating speed of the HVGT and LVGT combined working is 1000r/min, and under the high altitude environment, the HVGT and LVGT combined working range is larger than the partial load working condition. Under the working conditions of low altitude and high speed, the exhaust flow is large, so that the HVGT blades are fixed in a large opening degree for preventing the overlarge boost pressure, and the LVGT works independently to provide the target boost pressure.
In summary, the embodiments of the present invention are only a part of the embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims (4)

1. A control method of a variable-altitude double-VGT two-stage adjustable supercharging system is characterized by comprising the following steps of: the variable nozzle section high-pressure supercharger (HVGT), the variable nozzle section low-pressure supercharger (LVGT), an Electric Control Unit (ECU) and an electric control actuator (TCU) are included, the diesel engine, the variable nozzle section high-pressure supercharger (HVGT) and the variable nozzle section low-pressure supercharger (LVGT) are connected in series, the diesel engine is provided with an accelerator position sensor and a rotating speed sensor which are connected with the Electric Control Unit (ECU) through data lines, the Electric Control Unit (ECU) is connected with the electric control actuator (TCU), and the data lines of the electric control actuator (TCU) are respectively connected with the variable nozzle section high-pressure supercharger (HVGT) and the variable nozzle section low-pressure supercharger (LVGT) to send control signals; an Electronic Control Unit (ECU) is provided with an atmospheric pressure and temperature sensor for detecting the current altitude working condition in real time; the air inlet pipe and the air outlet pipe of the diesel engine are both provided with a supercharging pressure sensor and a temperature sensor; a supercharging pressure sensor is arranged at the air inlet end of the variable nozzle section high-pressure stage supercharger; the exhaust end of the high-pressure stage supercharger with the variable nozzle section is provided with a pressure sensor in the vortex, the supercharging pressure and temperature sensor, the supercharging pressure sensor and the pressure sensor in the vortex are respectively connected with an electric control actuator (TCU), and the actual supercharging pressure information of each part is sent to the electric control actuator (TCU);
under different altitudes and diesel engine working conditions, a control program is installed in a diesel engine ECU, the diesel engine ECU control program determines target value signals of the opening degrees of high-pressure and low-pressure VGT blades and boost pressure according to altitude, rotating speed and throttle opening degree signals, the target value signals are output to a boost system controller (TCU), and the TCU outputs control signals to an electric control actuator by combining received actual boost pressure and the target value signals, so that closed-loop control of the opening degrees of the high-pressure and low-pressure VGT blades is realized, and the diesel engine performance recovery target under different altitudes and working conditions is reached.
2. The variable altitude dual VGT two-stage adjustable boost system control method of claim 1, wherein: the ECU control program flow of the diesel engine comprises the following steps: starting to read a boost pressure MAP signal, judging whether MAP rises or not according to atmospheric pressure and working condition changes, judging whether HVGT is fully opened or not if the boost pressure MAP rises, and increasing HVGT blades if the boost pressure MAP does not fully open; if the LVGT is fully opened, judging whether the LVGT is fully opened or not, and if not, increasing the opening of the LVGT; if the switch is fully opened, the program is ended; if the boost pressure MAP is lowered, it is determined whether the HVGT is fully closed, if so, it is determined that the LVGT is fully closed, and if so, the full-closing procedure is ended.
3. The variable altitude dual VGT two-stage adjustable boost system control method of claim 1, wherein: diesel engine performance recovery objectives: the partial load condition is targeted at the optimum fuel consumption rate, and the full load condition is targeted at the maximum dynamic performance.
4. The variable altitude dual VGT two-stage adjustable boost system control method of claim 1, wherein: under the working condition that the altitude is less than 3500m, the high-pressure stage supercharger works, and the LVGT blades are fully opened to reduce exhaust resistance; under the working condition that the altitude is 3500 m-5500 m, the opening degree of the LVGT blades is gradually reduced, the two-stage superchargers are all put into operation, the air inlet pressure and the air inlet flow of the diesel engine are improved, the high-pressure VGT blades and the low-pressure VGT blades adjust the air inlet flow and the air inlet pressure of the diesel engine in real time, and the requirement of the diesel engine for self-adaption under the full working condition with variable altitude is met.
CN202010595136.7A 2020-06-24 2020-06-24 Control method of variable-altitude double-VGT two-stage adjustable supercharging system Pending CN111911302A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

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