CN116753078A - Anti-surge control method for supercharger - Google Patents
Anti-surge control method for supercharger Download PDFInfo
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- CN116753078A CN116753078A CN202310754202.4A CN202310754202A CN116753078A CN 116753078 A CN116753078 A CN 116753078A CN 202310754202 A CN202310754202 A CN 202310754202A CN 116753078 A CN116753078 A CN 116753078A
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- supercharger
- surge
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- engine
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- 238000000034 method Methods 0.000 title claims abstract description 36
- 230000008859 change Effects 0.000 claims abstract description 37
- 230000008569 process Effects 0.000 claims abstract description 14
- 230000003213 activating effect Effects 0.000 claims abstract description 4
- 230000009467 reduction Effects 0.000 claims description 11
- 238000001914 filtration Methods 0.000 claims description 6
- 238000012544 monitoring process Methods 0.000 claims description 3
- 230000002159 abnormal effect Effects 0.000 abstract description 9
- 230000001133 acceleration Effects 0.000 abstract description 5
- 230000009194 climbing Effects 0.000 abstract description 5
- 238000001514 detection method Methods 0.000 abstract description 3
- 238000005259 measurement Methods 0.000 abstract description 3
- 238000011217 control strategy Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000001960 triggered effect Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/0047—Controlling exhaust gas recirculation [EGR]
- F02D41/0077—Control of the EGR valve or actuator, e.g. duty cycle, closed loop control of position
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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
- F02B37/16—Control of the pumps by bypassing charging air
- F02B37/162—Control of the pumps by bypassing charging air by bypassing, e.g. partially, intake air from pump inlet to pump outlet
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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
- F02B37/16—Control of the pumps by bypassing charging air
- F02B37/168—Control of the pumps by bypassing charging air into the exhaust conduit
-
- 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
- F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
- F02D9/02—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits concerning induction conduits
-
- 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
- F02D2200/1002—Output torque
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Supercharger (AREA)
Abstract
The invention discloses an anti-surge control method of a supercharger, which is mainly designed in the conception that in the acceleration process or the climbing process of the whole vehicle, the rotation speed or the torque change rate of the supercharger when the rotation speed is increased and rapidly reduced by increasing the engine load is used for pre-judging whether the compressor of the supercharger is impacted, then activating the anti-surge function and triggering the air system to respond, and after the impact probability is detected to be reduced, the anti-surge function is exited, so that the risk of abnormal sound of the supercharger in the scene can be effectively reduced, and the blank that a solution to the problem is difficult in the actual working condition is filled. According to the invention, the problem that the traditional anti-surge takes the throttle as a key detection condition is solved, the efficiency of judging that the supercharger is about to surge under a specific working condition is greatly improved, meanwhile, the probability of entering the anti-surge by mistake is reduced, the probability of the compressor of the supercharger being impacted is obviously reduced through actual measurement, the abnormal sound of the supercharger is effectively controlled, and the driving experience of a vehicle is further remarkably improved.
Description
Technical Field
The invention relates to the field of engine control, in particular to an anti-surge control method for a supercharger.
Background
When the diesel engine is suddenly unloaded or the rotation speed is suddenly reduced, the air quantity required in the cylinder can be greatly reduced, but the air quantity of the compressor is supplied and required due to the inertial running of the rotor of the supercharger, the back pressure rising flow is reduced, so that the compressor of the supercharger is impacted, surge occurs, abnormal sound is generated, and the drivability is influenced.
In order to reduce the subjective feeling of surge, an engine Electronic Control Unit (ECU) control system carries out open-loop control on an air system when a throttle is detected, adjusts the opening of an EGR valve, the opening of a TVA valve and a supercharger control valve, directly bypasses high-pressure air in an engine cylinder to an exhaust pipe and then carries out closed loop, and reduces noise caused by impact of a gas compressor.
Specifically, when the existing diesel engine anti-surge control strategy solves the problem of surge of a supercharger, the existing diesel engine anti-surge control strategy detects the throttle loosening working condition in the driving process, namely, when the throttle loosening is detected, the anti-surge function is activated based on the change of the pressure ratio of the supercharger, and then the opening of an EGR valve, the opening of a TVA valve, a supercharger control valve and the like are adjusted.
However, when the whole vehicle starts or the sudden resistance becomes larger, the accelerator pedal signal may not change or increase instead, but the air quantity required in the cylinder is greatly reduced, so that the compressor of the supercharger is impacted to generate surge and generate abnormal sound, and the state cannot be identified in the prior art.
Namely, the existing scheme cannot solve the problem of surge caused by the fact that the load of a vehicle is increased, the accelerator is increased and the rotation speed is reduced in the acceleration process or the climbing process.
Disclosure of Invention
In view of the foregoing, the present invention is directed to providing a method for controlling anti-surge of a supercharger, so as to solve the aforementioned technical problems.
The technical scheme adopted by the invention is as follows:
the invention provides a supercharger anti-surge control method, which comprises the following steps:
during running of the vehicle, monitoring the torque and the rotating speed of the engine;
based on the current torque change rate or the current rotation speed change rate, whether the supercharger compressor is impacted or not is judged in advance;
when the judgment result is yes, activating an anti-surge function and triggering an air system to respond;
and after the condition meeting the preset condition is detected, exiting the anti-surge function.
In at least one possible implementation manner, the determining manner of the current torque change rate includes: filtering the time constant of the torque change rate of the engine and combining the torque change gradient to obtain the current torque reduction rate;
the method for determining the current rotation speed change rate may include: and filtering the time constant of the engine speed change rate and combining the speed change gradient to obtain the current speed reduction rate.
In at least one possible implementation, the predicting whether the booster compressor is impacted includes:
if the current torque change rate or the current rotating speed change rate exceeds a preset drop rate threshold value and the holding time is overtime, the air compressor is judged to be impacted.
In at least one possible implementation, the threshold values of the rate of decrease of the engine torque and the rotational speed are calibrated in advance according to the running mode of the whole vehicle, the rotational speed of the engine, the ambient temperature and the ambient pressure.
In at least one possible implementation manner, the preset condition includes any one of the following:
the duration of the anti-surge function reaches a preset time threshold; or alternatively, the process may be performed,
in the calibration time, the current engine demand torque of the vehicle is larger than the calibration torque value, and the engine demand rotating speed is larger than the calibration rotating speed value.
In at least one possible implementation, the exiting the anti-surge function includes restoring a valve of the air system to a pre-anti-surge control mode.
In at least one possible implementation manner, the control method further includes: and (3) pre-calibrating the opening of a valve in the air system in a set high-temperature, plateau or high-cold environment.
Compared with the prior art, the main design concept of the invention is that in the acceleration process or the climbing process of the whole vehicle, the rotation speed or the torque change rate when the rotation speed is rapidly reduced is increased by the load of the engine, whether the compressor of the supercharger is impacted is judged, then the anti-surge function is activated and the air system is triggered to respond, and after the impact probability is detected to be reduced, the anti-surge function is exited, thereby effectively reducing the risk of abnormal sound of the supercharger in the scene and filling the blank that the solution to the problem is difficult in the actual working condition. According to the invention, the problem that the traditional anti-surge takes the throttle as a key detection condition is solved, the efficiency of judging that the supercharger is about to surge under a specific working condition is greatly improved, meanwhile, the probability of entering the anti-surge by mistake is reduced, the probability of the compressor of the supercharger being impacted is obviously reduced through actual measurement, the abnormal sound of the supercharger is effectively controlled, and the driving experience of a vehicle is further remarkably improved.
Drawings
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described with reference to the accompanying drawings, in which:
fig. 1 is a schematic flow chart of a method for controlling anti-surge of a supercharger according to an embodiment of the present invention.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.
The invention provides an embodiment of a supercharger anti-surge control method, in particular as shown in fig. 1, which comprises the following steps:
step S1, monitoring the torque and the rotating speed of an engine in the running process of a vehicle;
step S2, based on the current torque change rate or the current rotation speed change rate, whether the supercharger compressor is impacted or not is judged in advance;
in the acceleration process or the climbing process of the whole vehicle, the load of the engine is suddenly increased and the rotating speed is rapidly reduced, and if the torque reduction rate or the rotating speed reduction rate of the engine is lower than a preset reduction rate calibration value in the calibration time, the air compressor is judged to be impacted. The engine torque reduction rate threshold value or the rotation speed reduction rate threshold value can be stored and output in advance according to the conditions of the whole vehicle running mode, the engine rotation speed, the ambient temperature, the ambient pressure and the like.
Step S3, when the judgment result is yes, activating an anti-surge function and triggering an air system to respond;
for example, an EGR valve, TVA valve, or supercharger control valve may be opened to bypass high pressure intake air that would otherwise have entered the engine cylinder through the intake manifold directly to the exhaust pipe, reducing noise due to compressor surge. Specifically, the opening degrees of the EGR valve and the TVA valve (supercharger control valve) may be controlled to change the intake air flow direction, wherein the combustion parameters are differentiated and corrected based on the operating state, the ambient pressure, the ambient temperature, the water temperature, etc., so that the valve opening degrees in the air system may be optimized at different altitudes and temperatures, that is, preferably pre-calibrated in the set high-temperature, plateau or alpine environment.
And S4, after detecting that the preset condition is met, exiting the anti-surge function.
Specifically, the preset conditions include any one of the following: the duration of the anti-surge function reaches a preset time threshold, or in a calibrated time, the current engine demand torque of the vehicle is greater than a calibrated torque value, and the engine demand rotational speed is greater than a calibrated rotational speed value.
And the exiting anti-surge function may specifically refer to restoring the valve of the air system to the control mode prior to anti-surge (original closed loop control).
The determination method of the current torque change rate may include: and filtering the time constant of the torque change rate of the engine and combining the torque change gradient to obtain the current torque reduction rate.
The determination method of the current rotation speed change rate may include: and filtering the time constant of the engine speed change rate and combining the speed change gradient to obtain the current speed reduction rate.
Based on this concept, the pre-judging whether the compressor of the supercharger is impacted may include that the current torque change rate or the current rotation speed change rate exceeds a preset drop rate threshold value, and the holding time is overtime (the drop holding time threshold value may be calibrated separately), and then the compressor is judged to be impacted.
Corresponding to some embodiments, a supercharger anti-impact function module TCPrt corresponding to the above certain control strategies may be newly added in ECU control software, where the function module may detect whether the compressor is impacted, and in actual operation, the PmpSetCond module may detect and analyze whether the compressor has an impact phenomenon, specifically, when detecting that the engine rotation speed drop rate is lower than a calibration value in a calibration time, the TCPrt function module determines that the compressor is impacted, so as to be used as a key condition for triggering an anti-surge function, and directly determines whether to activate anti-surge through the rotation speed or the torque change rate, so that compared with the prior art that the signal of the loose accelerator pedal is determined first and then whether the anti-surge condition enters anti-surge, the method is quicker and more accurate, because the loose accelerator does not necessarily surge, if the entering function is too frequent, false triggering is easily caused, and the drivability is affected.
Continuing the above, two functional module calibration parameters of AirCtl_Mon and PCR_Mon can be called to control the opening positions of the EGR valve and the TVA valve (supercharger control valve) (the combustion parameters are distinguished and corrected based on the running state, the ambient pressure, the ambient temperature, the water temperature and the like, so that the vehicle can be respectively optimized under different altitudes and temperatures, namely, the vehicle is preferably calibrated under special environmental conditions such as high temperature, plateau, high cold and the like, because the pressure increasing capability of the supercharger under different environments is greatly different), the intake flow direction is changed, the high-pressure intake which is originally fed into the engine cylinder through the intake manifold is directly bypassed to the exhaust pipe, and the noise caused by the impact of the air compressor is reduced.
In addition, the PmprSTCond module can detect and analyze that the impact phenomenon of the compressor is finished, and when the impact phenomenon of the compressor is detected to disappear, the EGR valve and the TVA valve (the supercharger control valve) are controlled to restore to the original control modes, so that the probability of abnormal sound generated by surge of the supercharger compressor due to impact can be reduced.
In summary, the main design concept of the invention is that in the acceleration process or the climbing process of the whole vehicle, the rotation speed or the torque change rate when the rotation speed is rapidly reduced is increased by the load of the engine, whether the compressor of the supercharger is impacted is judged, then the anti-surge function is activated and the air system is triggered to respond, and after the impact probability is detected to be reduced, the anti-surge function is exited, so that the risk of abnormal sound of the supercharger in the scene can be effectively reduced, and the blank that the problem is difficult to solve in the actual working condition is filled. According to the invention, the problem that the traditional anti-surge takes the throttle as a key detection condition is solved, the efficiency of judging that the supercharger is about to surge under a specific working condition is greatly improved, meanwhile, the probability of entering the anti-surge by mistake is reduced, the probability of the compressor of the supercharger being impacted is obviously reduced through actual measurement, the abnormal sound of the supercharger is effectively controlled, and the driving experience of a vehicle is further remarkably improved.
In the embodiments of the present invention, "at least one" means one or more, and "a plurality" means two or more. "and/or", describes an association relation of association objects, and indicates that there may be three kinds of relations, for example, a and/or B, and may indicate that a alone exists, a and B together, and B alone exists. Wherein A, B may be singular or plural. The character "/" generally indicates that the context-dependent object is an "or" relationship. "at least one of the following" and the like means any combination of these items, including any combination of single or plural items. For example, at least one of a, b and c may represent: a, b, c, a and b, a and c, b and c or a and b and c, wherein a, b and c can be single or multiple.
The construction, features and effects of the present invention are described in detail according to the embodiments shown in the drawings, but the above is only a preferred embodiment of the present invention, and it should be understood that the technical features of the above embodiment and the preferred mode thereof can be reasonably combined and matched into various equivalent schemes by those skilled in the art without departing from or changing the design concept and technical effects of the present invention; therefore, the invention is not limited to the embodiments shown in the drawings, but is intended to be within the scope of the invention as long as changes made in the concept of the invention or modifications to the equivalent embodiments do not depart from the spirit of the invention as covered by the specification and drawings.
Claims (7)
1. A method of anti-surge control of a supercharger, comprising:
during running of the vehicle, monitoring the torque and the rotating speed of the engine;
based on the current torque change rate or the current rotation speed change rate, whether the supercharger compressor is impacted or not is judged in advance;
when the judgment result is yes, activating an anti-surge function and triggering an air system to respond;
and after the condition meeting the preset condition is detected, exiting the anti-surge function.
2. The supercharger anti-surge control method of claim 1, wherein the determination of the current torque rate of change comprises: filtering the time constant of the torque change rate of the engine and combining the torque change gradient to obtain the current torque reduction rate;
the method for determining the current rotation speed change rate may include: and filtering the time constant of the engine speed change rate and combining the speed change gradient to obtain the current speed reduction rate.
3. The supercharger anti-surge control method of claim 2, wherein the pre-determining whether the supercharger compressor is subject to an impact comprises:
if the current torque change rate or the current rotating speed change rate exceeds a preset drop rate threshold value and the holding time is overtime, the air compressor is judged to be impacted.
4. The method according to claim 3, wherein the threshold values of the rate of decrease in the engine torque and the rotational speed are calibrated in advance based on the operation mode of the whole vehicle, the rotational speed of the engine, the ambient temperature, and the ambient pressure.
5. The supercharger anti-surge control method of claim 1, wherein the preset conditions comprise any one of:
the duration of the anti-surge function reaches a preset time threshold; or alternatively, the process may be performed,
in the calibration time, the current engine demand torque of the vehicle is larger than the calibration torque value, and the engine demand rotating speed is larger than the calibration rotating speed value.
6. The supercharger anti-surge control method of claim 1, wherein exiting the anti-surge function comprises restoring a valve of an air system to a pre-anti-surge control mode.
7. The supercharger anti-surge control method of any one of claims 1-6, wherein the control method further comprises: and (3) pre-calibrating the opening of a valve in the air system in a set high-temperature, plateau or high-cold environment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310754202.4A CN116753078A (en) | 2023-06-21 | 2023-06-21 | Anti-surge control method for supercharger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310754202.4A CN116753078A (en) | 2023-06-21 | 2023-06-21 | Anti-surge control method for supercharger |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116753078A true CN116753078A (en) | 2023-09-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310754202.4A Pending CN116753078A (en) | 2023-06-21 | 2023-06-21 | Anti-surge control method for supercharger |
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| Country | Link |
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| CN (1) | CN116753078A (en) |
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2023
- 2023-06-21 CN CN202310754202.4A patent/CN116753078A/en active Pending
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