CN114592968B - Control method, device and system for eliminating surge of supercharger - Google Patents
Control method, device and system for eliminating surge of supercharger Download PDFInfo
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- CN114592968B CN114592968B CN202210262755.3A CN202210262755A CN114592968B CN 114592968 B CN114592968 B CN 114592968B CN 202210262755 A CN202210262755 A CN 202210262755A CN 114592968 B CN114592968 B CN 114592968B
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/02—Surge control
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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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Abstract
The invention discloses a control method, a device and a system for eliminating surge of a supercharger, wherein the control method comprises the following steps: the method comprises the steps of obtaining current engine working condition parameters, a current gearbox gear and current gas tank pressure, determining torque allowance of an engine under the current gearbox gear based on the current engine working condition parameters, determining a gearbox gear difference value at the current adjacent collection time based on gear sampling frequency when an engine power output reducing instruction is received and if the torque allowance is not larger than a preset torque allowance, and determining a corresponding active intervention strategy of a supercharger air inlet boundary based on the magnitude relation between the gearbox gear difference value and 0 when the current gas tank pressure is not smaller than a pressure threshold value, so that when the supercharger is determined to be about to enter a transient surge working condition, a high-pressure supply system is controlled in advance to input high-pressure gas into a starting time and an ending time of a pipeline system before the supercharger is compressed, the purpose of eliminating the surge of the supercharger is achieved, and the occurrence of surge noise of the supercharger is avoided.
Description
Technical Field
The invention relates to the technical field of electromechanics, in particular to a control method, a control device and a control system for eliminating surge of a supercharger.
Background
The supercharger can compress air or combustible gas mixture entering the cylinder of the engine in advance so as to improve the density of the air or the combustible gas mixture entering the cylinder, further improve the power of the engine and the economy of the engine, improve the emission performance of the engine and the like. Because of the many advantages that superchargers can bring to engines, pipe applications in engines are becoming more and more widespread.
However, when the power output of the engine is changed from a high power region to a low power region, a surge problem occurs in a supercharger (particularly a turbocharger), so that the surge noise occurs in the supercharger, and the comfort of passengers of a vehicle in which the engine is located is affected. And the surge problem can also affect the performance of the engine when it is severe.
Therefore, how to provide a method for eliminating the surge of the supercharger is a technical problem that needs to be solved by those skilled in the art.
Disclosure of Invention
In view of the above, the invention discloses a control method, a device and a system for eliminating surge of a supercharger, so as to achieve the purpose of eliminating surge of the supercharger and avoid surge noise of the supercharger.
A control method for eliminating supercharger surge, applied to an engine control unit, the control method comprising:
acquiring current engine working condition parameters, current gearbox gear and current gas tank pressure;
determining the torque allowance of the engine under the current gearbox gear based on the current engine working condition parameters;
when an engine power output reducing instruction is received, judging whether the torque margin is not larger than a preset torque margin or not;
if yes, determining a gearbox gear difference value at the current adjacent acquisition time based on the gear sampling frequency;
when the current gas tank pressure is not smaller than a pressure threshold value, determining a corresponding active intervention strategy of the air inlet boundary of the supercharger based on the magnitude relation between the gear difference value of the gearbox and 0;
the active intervention strategy of the air inlet boundary of the supercharger is used for controlling the starting time and the ending time of the high-pressure gas input to the pipeline system before the compressor of the supercharger by the high-pressure supply system in advance when the supercharger is determined to be about to enter the transient surge working condition.
Optionally, the current engine working condition parameters include: current engine speed, current speed torque, and current speed full torque;
the torque margin is the difference between the current rotational speed full torque and the current rotational speed torque.
Optionally, the preset torque margin is determined based on the current rotational speed full load torque and a surge torque coefficient, wherein the surge torque coefficient has different values under different gear positions of the gearbox and different rotational speeds of the engine.
Optionally, when the current gas tank pressure is not less than a pressure threshold, determining a corresponding supercharger intake boundary active intervention strategy based on a magnitude relation between the gearbox gear difference value and 0, including:
when the current gas tank pressure is not smaller than the pressure threshold value, judging whether the gear difference value of the gearbox is not equal to 0;
if so, controlling the high-pressure supply system to start working, and inputting high-pressure gas into the pipeline system before the pressure of the supercharger compressor by the high-pressure supply system so as to increase the gas pressure in the pipeline system before the pressure of the supercharger compressor;
determining an engine speed difference value at a current adjacent acquisition time based on the speed sampling frequency;
judging whether the engine speed difference is larger than a preset speed difference, or whether the current gas tank pressure is reduced to be lower than the pressure threshold, or whether the opening time of the high-pressure supply system reaches the upper limit of the opening time;
and if so, controlling the high-pressure supply system to stop working.
Optionally, the method further comprises:
when the gear difference value of the gearbox is equal to 0, controlling the high-pressure supply system to start working, and inputting high-pressure gas into the pipeline system before the pressure of the supercharger compressor by the high-pressure supply system so as to increase the gas pressure in the pipeline system before the pressure of the supercharger compressor;
judging whether the current gas tank pressure is reduced to be lower than the pressure threshold value, and judging whether the opening time of the high-pressure supply system reaches the upper limit of the opening time;
and if so, controlling the high-pressure supply system to stop working.
Optionally, the high pressure supply system includes: an electromagnetic control valve, a high-pressure air storage tank and an air compressor;
the control end of the air compressor is connected with the engine, the output end of the air compressor is connected with the high-pressure air storage tank, and the high-pressure air storage tank is connected to a connecting passage of the high-pressure air storage tank and the booster compressor pre-pressure pipeline system through the electromagnetic control valve;
the control end of the electromagnetic control valve is connected with the engine control unit and used for conducting and switching on and off according to the on and off signals output by the engine control unit.
Optionally, when the current tank pressure is less than the pressure threshold, returning to determining the gearbox step difference again.
A control device for eliminating supercharger surge, applied to an engine control unit, the control device comprising:
the acquisition unit is used for acquiring current engine working condition parameters, current gearbox gear and current gas tank pressure;
a torque margin determining unit, configured to determine a torque margin of an engine in the current gearbox gear based on the current engine operating condition parameter;
a judging unit configured to judge whether the torque margin is not greater than a preset torque margin when an engine power output reduction instruction is received;
the gear difference value determining unit is used for determining the gear difference value of the gearbox at the current adjacent acquisition time based on the gear sampling frequency under the condition that the judging unit judges yes;
an intervention strategy determining unit, configured to determine a corresponding supercharger intake boundary active intervention strategy based on a magnitude relation between the transmission gear difference value and 0 when the current gas tank pressure is not less than a pressure threshold value;
the active intervention strategy of the air inlet boundary of the supercharger is used for controlling the starting time and the ending time of the high-pressure gas input to the pipeline system before the compressor of the supercharger by the high-pressure supply system in advance when the supercharger is determined to be about to enter the transient surge working condition.
Optionally, the intervention policy determination unit includes:
a first judging subunit, configured to judge whether the gear difference value of the transmission is not equal to 0 when the current gas tank pressure is not less than the pressure threshold;
the first control subunit is used for controlling the high-pressure supply system to start working under the condition that the first judging subunit judges yes, and the high-pressure supply system inputs high-pressure gas into the pipeline system before the pressure of the supercharger compressor so as to increase the gas pressure in the pipeline system before the pressure of the supercharger compressor;
the rotating speed difference value determining subunit is used for determining the rotating speed difference value of the engine at the current adjacent acquisition time based on the rotating speed sampling frequency;
a second judging subunit, configured to judge whether the engine speed difference is greater than a preset speed difference, or the current gas tank pressure drops below the pressure threshold, or the opening time of the high pressure supply system reaches an upper opening time limit;
and the second control subunit is used for controlling the high-pressure supply system to stop working when the second judging subunit judges that the high-pressure supply system is in the positive state.
Optionally, the method further comprises:
the third control subunit is used for controlling the high-pressure supply system to start working when the gear difference value of the gearbox is equal to 0, and the high-pressure supply system inputs high-pressure gas into the pipeline system before the pressure of the supercharger compressor so as to increase the gas pressure in the pipeline system before the pressure of the supercharger compressor;
a third judging subunit, configured to judge whether the current gas tank pressure falls below the pressure threshold, and the opening time of the high pressure supply system reaches the upper opening time limit;
and the fourth control subunit is used for controlling the high-pressure supply system to stop working when the third judging subunit judges yes.
A control system for eliminating supercharger surge, comprising: the system comprises an engine, a turbocharger pre-vortex exhaust pipeline system, a turbocharger turbine, a turbocharger post-vortex exhaust pipeline system, a turbocharger compressor pre-compression pipeline system, an electromagnetic control valve, a high-pressure air storage tank, air compression, a turbocharger compressor post-compression pipeline system and an engine control unit, wherein the engine control unit comprises the control device;
the turbocharger compressor pre-compression pipeline system is communicated with the turbocharger compressor post-compression pipeline system through the turbocharger compressor, the turbocharger compressor post-compression pipeline system is connected with an inlet of the engine, an outlet of the engine is connected with the turbocharger pre-vortex exhaust pipeline system, and the turbocharger pre-vortex exhaust pipeline system is communicated with the turbocharger post-vortex exhaust pipeline system through the turbocharger turbine;
the control end of the air compressor is connected with the engine, the output end of the air compressor is connected with the high-pressure air storage tank, and the high-pressure air storage tank is connected to a connecting passage of the high-pressure air storage tank and the booster compressor pre-pressure pipeline system through the electromagnetic control valve;
the control end of the electromagnetic control valve is connected with the engine control unit and used for conducting and switching off according to the on-off signals output by the engine control unit;
the electromagnetic control valve, the high-pressure air storage tank and the air compressor form a high-pressure supply system.
As can be seen from the technical scheme, the invention discloses a control method, a device and a system for eliminating surge of a supercharger, wherein the control method comprises the following steps: the method comprises the steps of obtaining current engine working condition parameters, a current gearbox gear and current gas tank pressure, determining torque allowance of an engine under the current gearbox gear based on the current engine working condition parameters, determining a gearbox gear difference value at the current adjacent collection time based on gear sampling frequency when an engine power output reducing instruction is received and if the torque allowance is not larger than a preset torque allowance, and determining a corresponding active intervention strategy of a supercharger air inlet boundary based on the magnitude relation between the gearbox gear difference value and 0 when the current gas tank pressure is not smaller than a pressure threshold value, so that when the supercharger is determined to be about to enter a transient surge working condition, a high-pressure supply system is controlled in advance to input high-pressure gas into a starting time and an ending time of a pipeline system before the supercharger is compressed, the purpose of eliminating the surge of the supercharger is achieved, and the occurrence of surge noise of the supercharger is avoided.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the disclosed drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a control system for eliminating supercharger surge in accordance with an embodiment of the present disclosure;
FIG. 2 is a flow chart of a control method for eliminating supercharger surge in accordance with an embodiment of the present invention;
FIG. 3 is a flow chart of a method for determining a corresponding active intervention strategy for the air intake boundary of a supercharger based on the magnitude relation between a gear difference value and 0 of a gearbox according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a control device for eliminating surge of a supercharger according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The embodiment of the invention discloses a control method, a device and a system for eliminating surge of a supercharger, wherein the control method comprises the following steps: the method comprises the steps of obtaining current engine working condition parameters, a current gearbox gear and current gas tank pressure, determining torque allowance of an engine under the current gearbox gear based on the current engine working condition parameters, determining a gearbox gear difference value at the current adjacent collection time based on gear sampling frequency when an engine power output reducing instruction is received and if the torque allowance is not larger than a preset torque allowance, and determining a corresponding active intervention strategy of a supercharger air inlet boundary based on the magnitude relation between the gearbox gear difference value and 0 when the current gas tank pressure is not smaller than a pressure threshold value, so that when the supercharger is determined to be about to enter a transient surge working condition, a high-pressure supply system is controlled in advance to input high-pressure gas into a starting time and an ending time of a pipeline system before the supercharger is compressed, the purpose of eliminating the surge of the supercharger is achieved, and the occurrence of surge noise of the supercharger is avoided.
Referring to fig. 1, a schematic composition diagram of a control system for eliminating turbocharger surge according to an embodiment of the present invention is disclosed, the control system comprising: the engine 1, the turbocharger pre-turbo exhaust gas piping system 2, the turbocharger turbine 3, the turbocharger post-turbo exhaust gas piping system 4, the turbocharger compressor 5, the turbocharger compressor pre-press piping system 6, the electromagnetic control valve 7, the high-pressure air tank 8, the air compression 9, the turbocharger compressor post-press piping system 10, and the engine control unit (not shown in fig. 1).
The turbocharger compressor pre-compression pipeline system 6 is communicated with the turbocharger compressor post-compression pipeline system 10 through the turbocharger compressor 5, the turbocharger compressor post-compression pipeline system 10 is connected with an inlet of the engine 1, an outlet of the engine 1 is connected with the turbocharger pre-vortex exhaust pipeline system 2, and the turbocharger pre-vortex exhaust pipeline system 2 is communicated with the turbocharger post-vortex exhaust pipeline system 4 through the turbocharger turbine 3.
The control end of the air compressor 9 is connected with the engine 1, the output end of the air compressor 9 is connected with the high-pressure air storage tank 8, and the high-pressure air storage tank 8 is connected with a connecting passage of the high-pressure air storage tank 8 and the booster compressor pre-pressure pipeline system 6 through the electromagnetic control valve 7.
The control end 7 of the electromagnetic control valve is connected with an engine control unit (not shown in fig. 1) and is used for conducting and switching on and off according to a conducting and switching-off signal output by the engine control unit.
In this embodiment, the electromagnetic control valve 7, the high-pressure air tank 8, and the air compressor 9 form a high-pressure supply system, which may be collectively referred to as: pressure supply system, abbreviated PSS.
The turbocharger according to the present invention may be a turbocharger.
Referring to fig. 2, a flowchart of a control method for eliminating turbocharger surge according to an embodiment of the present invention is disclosed, and the control method is applied to the engine control unit in the embodiment shown in fig. 1, and includes:
s101, acquiring current engine working condition parameters, current gearbox gear and current gas tank pressure;
the current engine operating condition parameters may include: current engine speed n 1 Current rotational speed torque T 1 And the current rotational speed full load torque T 1full 。
The current gearbox gear is denoted by G and the current tank pressure is denoted by P.
Step S102, determining the torque allowance of the engine under the current gearbox gear based on the current engine working condition parameters;
wherein the torque margin delta T is the full load torque T of the current rotating speed 1full Torque T from current rotational speed 1 The expression is as follows:
△T＝T 1full -T 1 。
step S103, when an engine power output reducing instruction is received, judging whether the torque margin is not larger than a preset torque margin, and if so, executing step S104;
the value of the preset torque margin is determined according to actual needs, and the invention is not limited herein.
In this embodiment, when an engine power output reducing command is received, due to inertia, high-energy exhaust gas still exists in the turbocharger pre-turbo exhaust pipe system 2, the turbocharger turbine 3 is pushed by the exhaust gas to continue to input work to the turbocharger compressor 5, as the supply of oil to the engine 1 is reduced, the demand of fresh air by the engine 1 is reduced, high-pressure gas which cannot be consumed in a short time is collected in the turbocharger pre-turbo pipe system 6, as the rotational speed of the turbocharger is reduced, the gas amount in the turbocharger pre-turbo pipe system 6 is reduced, and the turbocharger compressor tends to generate high-pressure ratio and low-flow operation conditions.
In practical applications, there are many ways to determine that an engine power output reduction command is received, for example, that a 0% accelerator opening demand is received.
Wherein the torque margin DeltaT is preset Threshold value Full load torque T based on current rotational speed 1full And a surge torque coefficient K1, a preset torque margin delta T Threshold value The expression of (2) is as follows:
△T threshold value ＝K1*T 1full 。
It should be noted that, the magnitude of the value of the surge torque coefficient K1 can reflect the severity of the occurrence of surge, and the surge torque coefficient K1 is counted in the actual application scenario of the whole vehicle. The surge torque coefficient K1 is different in value under different gear positions of the gearbox and different engine speeds. In the electric control calibration procedure, the value of the surge torque coefficient K1 is a CURVE CURVE.
Examples of surge torque coefficients for different transmission gear positions are shown in table 1:
TABLE 1
Wherein k is 0.ltoreq.k in Table 1 1i ≤1。
Referring to Table 1, as when the transmission gear G is 5, the engine speed n 1 1800r/min, the current rotational speed torque T at the rotational speed 1 1000N.m, engine speed n 1 Under full load torque T 1full The torque margin DeltaT at 1800r/min was calculated to be 800N.m.
The preset torque margin is 0.5×1800n.m=900 n.m.
In this embodiment Δt=800 n.m < 900n.m, and therefore, step S104 is continued.
When the torque margin is greater than the preset torque margin, the process returns to step S101, and the latest engine operating condition parameter, gearbox gear and air tank pressure are obtained again.
Step S104, determining a gearbox gear difference value at the current adjacent acquisition time based on the gear sampling frequency;
two groups of gearbox gears are continuously collected according to the gear sampling frequency f1, and the two groups of gearbox gears are respectively: g i And G i+1 Then the gearbox gear difference Δg=g i -G i+1 。
Step S105, when the current gas tank pressure is not smaller than a pressure threshold value, determining a corresponding supercharger inlet boundary active intervention strategy based on the magnitude relation between the gear difference value of the gearbox and 0;
the active intervention strategy of the air inlet boundary of the supercharger is used for controlling the starting time and the ending time of the high-pressure gas input to the pipeline system before the compressor of the supercharger by the high-pressure supply system in advance when the supercharger is determined to be about to enter the transient surge working condition.
The value of the pressure threshold is determined according to the requirement, and the invention is not limited herein.
As shown in fig. 1, the high-pressure supply system of the present invention includes: the method comprises the following steps of an electromagnetic control valve 7, a high-pressure air storage tank 8 and air compression 9, wherein the specific implementation process of the active intervention strategy of the air inlet boundary of the supercharger is as follows: when the supercharger is determined to be about to enter a transient surge working condition, high-pressure gas compressed to the high-pressure gas storage tank 8 by the air compressor 9 is conducted in advance, the high-pressure gas in the high-pressure gas storage tank 8 flows into the front-pressure pipeline system 2 of the supercharger by controlling the electromagnetic control valve 7 to conduct, and the high-pressure gas in the high-pressure gas storage tank 8 is blocked from flowing into the front-pressure pipeline system 2 of the supercharger by controlling the electromagnetic control valve 7 to turn off, so that the effect of adjusting the turbocharger compressor 5 to be far away from a surge area is achieved, the purpose of eliminating the surge of the supercharger is achieved, and the surge noise of the supercharger is avoided.
In summary, the invention discloses a control method for eliminating the surge of a supercharger, which is characterized by acquiring current engine working condition parameters, current gearbox gear and current air tank pressure, determining the torque allowance of an engine under the current gearbox gear based on the current engine working condition parameters, determining the gearbox gear difference value at the current adjacent acquisition time based on gear sampling frequency if the torque allowance is not larger than preset torque allowance when an engine power output reducing instruction is received, and determining a corresponding active intervention strategy of the air inlet boundary of the supercharger based on the size relation between the gearbox gear difference value and 0 when the current air tank pressure is not smaller than a pressure threshold value, so that when the supercharger is determined to be about to enter a transient surge working condition, the high-pressure supply system is controlled in advance to input high-pressure air into the starting time and ending time of a pipeline system before the compressor of the supercharger, thereby achieving the purpose of eliminating the surge of the supercharger and avoiding the surge noise of the supercharger.
To further optimize the above embodiments, referring to fig. 3, a flowchart of a method for determining a corresponding active intervention strategy for an intake boundary of a supercharger based on a magnitude relation between a gear difference value of a transmission and 0 is disclosed in an embodiment of the present invention, where the method includes:
step S201, when the current gas tank pressure is not less than the pressure threshold, judging whether the gear difference value of the gearbox is not equal to 0, and if so, executing step S202;
assuming that the current gas tank pressure is P and the pressure threshold is M, when P is greater than or equal to M, the transmission gear difference Δg=0 or Δg+.0 is determined.
When Δg+.0, it is indicated that the transmission is performing a shift action, whereas when Δg=0, it is indicated that the transmission is not performing a shift action.
The value of the pressure threshold M is determined by the type of engine product, the other pressure requirements of the reservoir that can be maintained, and the speed at which the air compressor 9 fills the reservoir 8.
In this embodiment, when P is less than M, the process returns to step S101, and the transmission gear difference value at the current adjacent acquisition time is determined again.
Step S202, controlling a high-pressure supply system to start working, and inputting high-pressure gas into a pipeline system before the pressure of the supercharger compressor by the high-pressure supply system so as to increase the gas pressure in the pipeline system before the pressure of the supercharger compressor;
in this embodiment, when P is greater than or equal to M ≡Δg +.0, it is determined whether the transmission is upshifted or downshifted, and the supercharger is about to enter a transient surge condition, at this time, the present invention controls the high-pressure supply system PSS to start operating, and the PSS inputs high-pressure gas into the pre-compressor-piping system 6 to increase the gas pressure in the pre-compressor-piping system 6.
Specifically, when P is greater than or equal to M & ≡Δg +.0, in order to eliminate the supercharger surge, the PSS is controlled to start working, and at this time, the electromagnetic control valve 7 is opened, and the high-pressure gas in the gas tank 8 enters the pre-compressor-pressure pipeline system 6 of the turbocharger, so as to increase the gas pressure in the pre-compressor-pressure pipeline system 6 of the supercharger.
Step S203, determining an engine rotation speed difference value at the current adjacent acquisition time based on the rotation speed sampling frequency;
continuously collecting two groups of engine speeds according to the speed sampling frequency f2, wherein the two groups of engine speeds are respectively: n is n i And n i+1 The engine speed difference Δn=n i+1 -n i 。
Step S204, judging whether the engine speed difference is larger than a preset speed difference, or the current gas tank pressure is reduced to be lower than the pressure threshold, or the opening time of the high-pressure supply system reaches the upper limit of the opening time, if so, executing step S205;
the preset rotation speed difference N is determined according to actual needs, for example, 50r/min, which is not limited herein.
In the present embodiment, when the engine speed difference Δn > N, i.e. the engine speed is increased from the deceleration, or the current tank pressure P (i.e. the air pressure of the air tank 8) falls below the pressure threshold M, or the opening time Δt of the PSS reaches the upper opening time limit t c And when the PSS is triggered to stop working, the active intervention of the air inlet boundary of the supercharger is finished.
Step S205, the high-pressure supply system is controlled to stop working.
It should be noted that, step S201 to step S205 show that when P is greater than or equal to M ≡Δg +.0, the present invention discloses a supercharger intake boundary active intervention.
To further optimize the above embodiment, the present invention shows another active intervention of the supercharger intake boundary when p≡m ≡Δg=0.
Therefore, when step S201 determines no, it further includes:
step S206, controlling the high-pressure supply system to start working, and inputting high-pressure gas to the pipeline system before the pressure of the booster compressor by the high-pressure supply system so as to increase the gas pressure in the pipeline system before the pressure of the booster compressor;
in this embodiment, when P is greater than or equal to M &Δg=0, it indicates that the gearbox has no gear shifting action, and only the gearbox has a power reduction requirement on the vehicle in a fixed gear, and at this time, the invention also determines that the supercharger is about to enter a transient surge condition. The PSS is controlled to start working, and high-pressure gas is input into the pre-compressor-pressure pipeline system 6 of the booster by the PSS so as to increase the pressure of the gas in the pre-compressor-pressure pipeline system 6 of the booster.
Specifically, when P is greater than or equal to M &Δg=0, in order to eliminate the surge of the supercharger, the PSS is controlled to start working, and at this time, the electromagnetic control valve 7 is opened, and the high-pressure gas in the gas tank 8 enters the pre-compressor-pressure pipeline system 6 of the turbocharger, so as to increase the gas pressure in the pre-compressor-pressure pipeline system 6 of the supercharger.
Step S207, judging whether the current gas tank pressure is reduced to be lower than the pressure threshold value, and if so, executing step S208, wherein the opening time of the high-pressure supply system reaches the upper limit of the opening time;
at P.gtoreq.M&When determining the stop time of PSS in the case of Δg=0, only the on-time Δt of PSS is required to reach the upper on-time limit t, regardless of the engine speed c Or the current tank pressure (i.e., the air pressure of the air tank 8) falls below the pressure threshold M, at which point the PSS is triggered to stop.
And step S208, controlling the high-pressure supply system to stop working.
In summary, the invention achieves the purpose of eliminating the surge of the supercharger and avoids the surge noise of the supercharger by controlling the starting time and the ending time of the high-pressure gas input to the pipeline system before the compressor of the supercharger in advance when the supercharger is determined to be about to enter the transient surge working condition.
In addition, compared with the traditional scheme that the efficiency of the supercharger is reduced by discharging high-pressure gas of a pipeline after the compressor of the supercharger to a pipeline before the compressor of the supercharger, the invention realizes that the surge (mainly transient surge) of the supercharger is eliminated while the efficiency of the supercharger is ensured.
Further, after the surge of the supercharger is eliminated, the high-pressure gas in the pipeline after the compressor of the supercharger is pressed is continuously accumulated in the air inlet pipeline system after the compressor of the supercharger is pressed, so that the subsequent transient acceleration dynamic performance can be improved.
Corresponding to the embodiment of the method, the invention also discloses a control device for eliminating the surge of the supercharger.
Referring to fig. 4, a schematic structural diagram of a control device for eliminating surge of a supercharger, which is applied to an engine control unit in the embodiment shown in fig. 1, according to an embodiment of the present invention, includes:
an acquisition unit 301, configured to acquire a current engine operating condition parameter, a current gearbox gear, and a current gas tank pressure;
the current engine operating condition parameters may include: current engine speed n 1 Current rotational speed torque T 1 And the current rotational speed full load torque T 1full 。
The current gearbox gear is denoted by G and the current tank pressure is denoted by P.
A torque margin determination unit 302, configured to determine a torque margin of the engine in the current gearbox gear based on the current engine operating condition parameter;
wherein the torque margin delta T is the full load torque T of the current rotating speed 1full Torque T from current rotational speed 1 The expression is as follows:
△T＝T 1full -T 1 。
a judging unit 303 for judging whether the torque margin is not greater than a preset torque margin when an engine power output lowering instruction is received;
the value of the preset torque margin is determined according to actual needs, and the invention is not limited herein.
In this embodiment, when an engine power output reducing command is received, due to inertia, high-energy exhaust gas still exists in the turbocharger pre-turbo exhaust pipe system 2, the turbocharger turbine 3 is pushed by the exhaust gas to continue to input work to the turbocharger compressor 5, as the supply of oil to the engine 1 is reduced, the demand of fresh air by the engine 1 is reduced, high-pressure gas which cannot be consumed in a short time is collected in the turbocharger pre-turbo pipe system 6, as the rotational speed of the turbocharger is reduced, the gas amount in the turbocharger pre-turbo pipe system 6 is reduced, and the turbocharger compressor tends to generate high-pressure ratio and low-flow operation conditions.
In practical applications, there are many ways to determine that an engine power output reduction command is received, for example, that a 0% accelerator opening demand is received.
Wherein the torque margin DeltaT is preset Threshold value Full load torque T based on current rotational speed 1full And a surge torque coefficient K1, a preset torque margin delta T Threshold value The expression of (2) is as follows:
△T threshold value ＝K1*T 1full 。
It should be noted that, the magnitude of the value of the surge torque coefficient K1 can reflect the severity of the occurrence of surge, and the surge torque coefficient K1 is counted in the actual application scenario of the whole vehicle. The surge torque coefficient K1 is different in value under different gear positions of the gearbox and different engine speeds. In the electric control calibration procedure, the value of the surge torque coefficient K1 is a CURVE CURVE.
Examples of surge torque coefficients for different transmission gear steps are shown in table 1.
A gear difference determining unit 304, configured to determine, if the determining unit 303 determines that the determination is yes, a gear difference value of the transmission at a current adjacent acquisition time based on a gear sampling frequency;
two groups of gearbox gears are continuously collected according to the gear sampling frequency f1, and the two groups of gearbox gears are respectively: g i And G i+1 Then the gearbox gear difference Δg=g i -G i+1 。
An intervention strategy determination unit 305, configured to determine a corresponding supercharger intake boundary active intervention strategy based on a magnitude relation between the transmission gear difference value and 0 when the current gas tank pressure is not less than a pressure threshold value;
the active intervention strategy of the air inlet boundary of the supercharger is used for controlling the starting time and the ending time of the high-pressure gas input to the pipeline system before the compressor of the supercharger by the high-pressure supply system in advance when the supercharger is determined to be about to enter the transient surge working condition.
The value of the pressure threshold is determined according to the requirement, and the invention is not limited herein.
In summary, the invention discloses a control device for eliminating the surge of a supercharger, which is used for acquiring current engine working condition parameters, current gearbox gear and current gas tank pressure, determining the torque allowance of an engine under the current gearbox gear based on the current engine working condition parameters, determining the gearbox gear difference value at the current adjacent acquisition time based on gear sampling frequency when an engine power output reducing instruction is received and is not more than a preset torque allowance, and determining a corresponding active intervention strategy of the air inlet boundary of the supercharger based on the size relation between the gearbox gear difference value and 0 when the current gas tank pressure is not less than a pressure threshold value, so that when the supercharger is determined to be about to enter a transient surge working condition, a high-pressure supply system is controlled in advance to input high-pressure gas into the starting time and the ending time of a pipeline system before the compressor of the supercharger, the aim of eliminating the surge of the supercharger is achieved, and the surge noise of the supercharger is avoided.
To further optimize the above embodiment, the intervention policy determination unit 305 specifically includes:
a first judging subunit, configured to judge whether the gear difference value of the transmission is not equal to 0 when the current gas tank pressure is not less than the pressure threshold;
the first control subunit is used for controlling the high-pressure supply system to start working under the condition that the first judging subunit judges yes, and the high-pressure supply system inputs high-pressure gas into the pipeline system before the pressure of the supercharger compressor so as to increase the gas pressure in the pipeline system before the pressure of the supercharger compressor;
the rotating speed difference value determining subunit is used for determining the rotating speed difference value of the engine at the current adjacent acquisition time based on the rotating speed sampling frequency;
a second judging subunit, configured to judge whether the engine speed difference is greater than a preset speed difference, or the current gas tank pressure drops below the pressure threshold, or the opening time of the high pressure supply system reaches an upper opening time limit;
and the second control subunit is used for controlling the high-pressure supply system to stop working when the second judging subunit judges that the high-pressure supply system is in the positive state.
To further optimize the above embodiment, the intervention policy determination unit 305 may specifically further include:
the third control subunit is used for controlling the high-pressure supply system to start working when the gear difference value of the gearbox is equal to 0, and the high-pressure supply system inputs high-pressure gas into the pipeline system before the pressure of the supercharger compressor so as to increase the gas pressure in the pipeline system before the pressure of the supercharger compressor;
a third judging subunit, configured to judge whether the current gas tank pressure falls below the pressure threshold, and the opening time of the high pressure supply system reaches the upper opening time limit;
and the fourth control subunit is used for controlling the high-pressure supply system to stop working when the third judging subunit judges yes.
In summary, the invention achieves the purpose of eliminating the surge of the supercharger and avoids the surge noise of the supercharger by controlling the starting time and the ending time of the high-pressure gas input to the pipeline system before the compressor of the supercharger in advance when the supercharger is determined to be about to enter the transient surge working condition.
In addition, compared with the traditional scheme that the efficiency of the supercharger is reduced by discharging high-pressure gas of a pipeline after the compressor of the supercharger to a pipeline before the compressor of the supercharger, the invention realizes that the surge (mainly transient surge) of the supercharger is eliminated while the efficiency of the supercharger is ensured.
Further, after the surge of the supercharger is eliminated, the high-pressure gas in the pipeline after the compressor of the supercharger is pressed is continuously accumulated in the air inlet pipeline system after the compressor of the supercharger is pressed, so that the subsequent transient acceleration dynamic performance can be improved.
The specific operation principle of each component in the embodiment of the device should be specifically described, please refer to the corresponding portion of the method embodiment, and the detailed description is omitted herein.
Finally, it is further noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (11)
1. A control method for eliminating supercharger surge, characterized by being applied to an engine control unit, the control method comprising:
acquiring current engine working condition parameters, current gearbox gear and current gas tank pressure;
determining the torque allowance of the engine under the current gearbox gear based on the current engine working condition parameters;
when an engine power output reducing instruction is received, judging whether the torque margin is not larger than a preset torque margin or not;
if yes, determining a gearbox gear difference value at the current adjacent acquisition time based on the gear sampling frequency;
when the current gas tank pressure is not smaller than a pressure threshold value, determining a corresponding active intervention strategy of the air inlet boundary of the supercharger based on the magnitude relation between the gear difference value of the gearbox and 0;
the active intervention strategy of the air inlet boundary of the supercharger is used for controlling the starting time and the ending time of the high-pressure gas input to the pipeline system before the compressor of the supercharger by the high-pressure supply system in advance when the supercharger is determined to be about to enter the transient surge working condition.
2. The control method of claim 1, wherein the current engine operating condition parameters include: current engine speed, current speed torque, and current speed full torque;
the torque margin is the difference between the current rotational speed full torque and the current rotational speed torque.
3. The control method of claim 2, wherein the preset torque margin is determined based on the current rotational speed full torque and a surge torque coefficient, wherein the surge torque coefficient is different in value for different transmission gear and different engine speeds.
4. The control method of claim 1, wherein the determining a corresponding supercharger intake boundary active intervention strategy based on a magnitude relationship of the transmission gear difference value to 0 when the current tank pressure is not less than a pressure threshold value comprises:
when the current gas tank pressure is not smaller than the pressure threshold value, judging whether the gear difference value of the gearbox is not equal to 0;
if so, controlling the high-pressure supply system to start working, and inputting high-pressure gas into the pipeline system before the pressure of the supercharger compressor by the high-pressure supply system so as to increase the gas pressure in the pipeline system before the pressure of the supercharger compressor;
determining an engine speed difference value at a current adjacent acquisition time based on the speed sampling frequency;
judging whether the engine speed difference is larger than a preset speed difference, or whether the current gas tank pressure is reduced to be lower than the pressure threshold, or whether the opening time of the high-pressure supply system reaches the upper limit of the opening time;
and if so, controlling the high-pressure supply system to stop working.
5. The control method according to claim 4, characterized by further comprising:
when the gear difference value of the gearbox is equal to 0, controlling the high-pressure supply system to start working, and inputting high-pressure gas into the pipeline system before the pressure of the supercharger compressor by the high-pressure supply system so as to increase the gas pressure in the pipeline system before the pressure of the supercharger compressor;
judging whether the current gas tank pressure is reduced to be lower than the pressure threshold value, and judging whether the opening time of the high-pressure supply system reaches the upper limit of the opening time;
and if so, controlling the high-pressure supply system to stop working.
6. The control method according to claim 1, characterized in that the high-pressure supply system includes: an electromagnetic control valve, a high-pressure air storage tank and an air compressor;
the control end of the air compressor is connected with the engine, the output end of the air compressor is connected with the high-pressure air storage tank, and the high-pressure air storage tank is connected to a connecting passage of the high-pressure air storage tank and the booster compressor pre-pressure pipeline system through the electromagnetic control valve;
the control end of the electromagnetic control valve is connected with the engine control unit and used for conducting and switching on and off according to the on and off signals output by the engine control unit.
7. The control method according to claim 1, characterized in that when the current tank pressure is smaller than the pressure threshold value, the transmission gear difference value is determined again.
8. A control device for eliminating supercharger surge, characterized by being applied to an engine control unit, comprising:
the acquisition unit is used for acquiring current engine working condition parameters, current gearbox gear and current gas tank pressure;
a torque margin determining unit, configured to determine a torque margin of an engine in the current gearbox gear based on the current engine operating condition parameter;
a judging unit configured to judge whether the torque margin is not greater than a preset torque margin when an engine power output reduction instruction is received;
the gear difference value determining unit is used for determining the gear difference value of the gearbox at the current adjacent acquisition time based on the gear sampling frequency under the condition that the judging unit judges yes;
an intervention strategy determining unit, configured to determine a corresponding supercharger intake boundary active intervention strategy based on a magnitude relation between the transmission gear difference value and 0 when the current gas tank pressure is not less than a pressure threshold value;
the active intervention strategy of the air inlet boundary of the supercharger is used for controlling the starting time and the ending time of the high-pressure gas input to the pipeline system before the compressor of the supercharger by the high-pressure supply system in advance when the supercharger is determined to be about to enter the transient surge working condition.
9. The control apparatus according to claim 8, wherein the intervention policy determination unit includes:
a first judging subunit, configured to judge whether the gear difference value of the transmission is not equal to 0 when the current gas tank pressure is not less than the pressure threshold;
the first control subunit is used for controlling the high-pressure supply system to start working under the condition that the first judging subunit judges yes, and the high-pressure supply system inputs high-pressure gas into the pipeline system before the pressure of the supercharger compressor so as to increase the gas pressure in the pipeline system before the pressure of the supercharger compressor;
the rotating speed difference value determining subunit is used for determining the rotating speed difference value of the engine at the current adjacent acquisition time based on the rotating speed sampling frequency;
a second judging subunit, configured to judge whether the engine speed difference is greater than a preset speed difference, or the current gas tank pressure drops below the pressure threshold, or the opening time of the high pressure supply system reaches an upper opening time limit;
and the second control subunit is used for controlling the high-pressure supply system to stop working when the second judging subunit judges that the high-pressure supply system is in the positive state.
10. The control device according to claim 9, characterized by further comprising:
the third control subunit is used for controlling the high-pressure supply system to start working when the gear difference value of the gearbox is equal to 0, and the high-pressure supply system inputs high-pressure gas into the pipeline system before the pressure of the supercharger compressor so as to increase the gas pressure in the pipeline system before the pressure of the supercharger compressor;
a third judging subunit, configured to judge whether the current gas tank pressure falls below the pressure threshold, and the opening time of the high pressure supply system reaches the upper opening time limit;
and the fourth control subunit is used for controlling the high-pressure supply system to stop working when the third judging subunit judges yes.
11. A control system for eliminating supercharger surge, comprising: an engine, a turbocharger pre-turbo exhaust pipe system, a turbocharger turbine, a turbocharger post-turbo exhaust pipe system, a turbocharger compressor pre-compressor pipe system, an electromagnetic control valve, a high-pressure air storage tank, an air compressor, a turbocharger compressor post-compressor pipe system, and an engine control unit, wherein the engine control unit comprises the control device according to any one of claims 8 to 10;
the turbocharger compressor pre-compression pipeline system is communicated with the turbocharger compressor post-compression pipeline system through the turbocharger compressor, the turbocharger compressor post-compression pipeline system is connected with an inlet of the engine, an outlet of the engine is connected with the turbocharger pre-vortex exhaust pipeline system, and the turbocharger pre-vortex exhaust pipeline system is communicated with the turbocharger post-vortex exhaust pipeline system through the turbocharger turbine;
the control end of the air compressor is connected with the engine, the output end of the air compressor is connected with the high-pressure air storage tank, and the high-pressure air storage tank is connected to a connecting passage of the high-pressure air storage tank and the booster compressor pre-pressure pipeline system through the electromagnetic control valve;
the control end of the electromagnetic control valve is connected with the engine control unit and used for conducting and switching off according to the on-off signals output by the engine control unit;
the electromagnetic control valve, the high-pressure air storage tank and the air compressor form a high-pressure supply system.
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| US9981654B2 (en) * | 2016-06-02 | 2018-05-29 | Ford Global Technologies, Llc | Methods and systems for surge control |
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| FR3023242A1 (en) * | 2014-07-07 | 2016-01-08 | Peugeot Citroen Automobiles Sa | METHOD AND DEVICE FOR MONITORING THE THERMAL MOTOR RPM OF A VEHICLE DURING A REPORTING CHANGE |
| CN105840296A (en) * | 2015-02-02 | 2016-08-10 | 沃尔沃汽车公司 | Twin scroll turbocharger device with improved turbo response |
| DE102017005412A1 (en) * | 2016-06-21 | 2017-12-21 | Scania Cv Ab | Method and system for controlling a torque reduction of a gearshift operation |
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