CN115111053B - Turbocharger, opening control method and device thereof, vehicle and storage medium - Google Patents
Turbocharger, opening control method and device thereof, vehicle and storage medium Download PDFInfo
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- CN115111053B CN115111053B CN202210008825.2A CN202210008825A CN115111053B CN 115111053 B CN115111053 B CN 115111053B CN 202210008825 A CN202210008825 A CN 202210008825A CN 115111053 B CN115111053 B CN 115111053B
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- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000003860 storage Methods 0.000 title claims abstract description 9
- 239000000446 fuel Substances 0.000 claims description 39
- 238000002347 injection Methods 0.000 claims description 17
- 239000007924 injection Substances 0.000 claims description 17
- 230000001133 acceleration Effects 0.000 claims description 13
- 238000011065 in-situ storage Methods 0.000 claims description 11
- 230000007935 neutral effect Effects 0.000 claims description 11
- 230000002159 abnormal effect Effects 0.000 abstract description 12
- 230000008569 process Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 238000011217 control strategy Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001052 transient 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
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
- F02B37/12—Control of the pumps
- F02B37/24—Control of the pumps by using pumps or turbines with adjustable guide vanes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Supercharger (AREA)
Abstract
The invention provides a turbocharger, an opening control method and device thereof, a vehicle and a storage medium, wherein the method comprises the following steps: acquiring a difference value between the actual pre-vortex pressure of the turbocharger and a preset pre-vortex pressure limit value; if the difference is greater than zero, determining the current running condition of the vehicle, and adjusting the opening of the turbocharger according to the current running condition of the vehicle, otherwise, adjusting the opening of the turbocharger according to the preset target pressure. According to the invention, the control of the opening degree of the turbocharger is realized based on the difference value between the actual pre-vortex pressure and the preset pre-vortex pressure limit value, the actual pre-vortex pressure is prevented from exceeding the hardware limit value of the turbocharger, the damage risk of the turbocharger is reduced while the cost is not increased, and the problem of engine flameout caused by abnormal opening of the exhaust valve due to higher actual pre-vortex pressure can be avoided by limiting the magnitude of the actual pre-vortex pressure.
Description
Technical Field
The present invention relates to the field of vehicle technologies, and in particular, to a turbocharger, an opening control method and apparatus thereof, a vehicle, and a storage medium.
Background
With the implementation of stricter oil consumption and emission regulations, the miniaturization of the engine gradually becomes trend, the development of the miniaturization of the engine is closely related to a turbocharger (Turbocharger), and the turbocharger with a variable cross-sectional area utilizes the energy of exhaust gas to compress fresh air to increase the air inflow, so that the power boost of the small engine is improved, and the engine power performance is improved.
At present, the control logic of the turbocharger is to set the target post-pressure, then adjust the angle of the nozzle ring of the turbocharger according to the deviation between the actual post-pressure and the target post-pressure, when the actual post-pressure is smaller than the target post-pressure, the nozzle ring of the turbocharger is properly closed, the exhaust flow passage is narrowed, the flow resistance is increased to increase the pre-vortex pressure, so as to increase the flow rate of the exhaust gas, namely, the impulse of the exhaust gas pushing the turbine is increased to increase the rotation speed of the turbine, so that the actual post-pressure can be consistent with the target post-pressure, and when the actual post-pressure is larger than the target post-pressure, the nozzle ring is properly opened to keep the actual post-pressure consistent with the target post-pressure.
However, due to the severe working environment of high temperature, high pressure and high rotation speed, the highest rotation speed, the turbofront pressure and the turbofront-rear expansion ratio of the turbocharger are determined, the supercharging ratio before and after the compressor cannot be used as the boundary of a superhard part, the difference value between the actual pressure and the target pressure is used for controlling the opening of the turbocharger, in the transient process, the target pressure is large, inertia exists between the turbine and the middle connecting shaft, the increase of the actual pressure needs a certain time, in the increasing process, the opening of the turbocharger reaches the vicinity of 0% by continuously adjusting the angle of the nozzle ring, so that the rapid supercharging is realized, but the opening of the turbocharger is adjusted to 0% for a long time, the exhaust is blocked, the turbofront pressure is increased, the turbofront pressure exceeds the limit value, at the moment, the unresponsive control action damages the turbocharger, the operation reliability of the turbocharger is affected, and if the engine exhaust valve is abnormally opened due to the fact that the turbofront pressure is too high in the cylinder, and the engine exhaust valve is flameout is caused in the process.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems existing in the prior art.
Therefore, a first object of the present invention is to provide a method for controlling the opening of a turbocharger, which is to obtain a difference between an actual pre-turbo pressure of the turbocharger and a preset pre-turbo pressure limit value, and adjust the opening of the turbocharger according to a current operation condition of a vehicle when the difference is greater than zero, thereby realizing control of the opening of the turbocharger by setting the preset pre-turbo pressure limit value and based on the difference between the actual pre-turbo pressure and the preset pre-turbo pressure limit value, avoiding exceeding a hardware limit value of the turbocharger by the actual pre-turbo pressure, reducing the damage risk of the turbocharger without increasing the cost, thereby improving the operation reliability of the turbocharger, and avoiding the problem of engine stall caused by abnormal opening of an exhaust valve due to higher actual pre-turbo pressure by limiting the magnitude of the actual pre-turbo pressure.
To this end, a second object of the present invention is to provide an opening degree control device for a turbocharger.
To this end, a third object of the present invention is to propose a turbocharger.
To this end, a fourth object of the invention is to propose a vehicle.
To this end, a fifth object of the present invention is to propose a computer readable storage medium.
In order to achieve the above object, an embodiment of a first aspect of the present invention proposes a method of controlling an opening degree of a turbocharger, the method comprising: acquiring a difference value between the actual pre-vortex pressure of the turbocharger and a preset pre-vortex pressure limit value; judging whether the difference is larger than zero or not; if yes, determining the current running condition of the vehicle, adjusting the opening of the turbocharger according to the current running condition of the vehicle, otherwise, adjusting the opening of the turbocharger according to the preset target pressure.
According to the opening control method of the turbocharger, the difference between the actual pre-vortex pressure of the turbocharger and the preset pre-vortex pressure limit value is obtained, and when the difference is larger than zero, the opening of the turbocharger is adjusted according to the current running condition of the vehicle, so that the control of the opening of the turbocharger is realized by setting the preset pre-vortex pressure limit value and based on the difference between the actual pre-vortex pressure and the preset pre-vortex pressure limit value, the situation that the actual pre-vortex pressure exceeds the hardware limit value of the turbocharger is avoided, the damage risk of the turbocharger is reduced while the cost is not increased, the running reliability of the turbocharger is improved, and the problem of engine flameout caused by abnormal opening of an exhaust valve due to higher actual pre-vortex pressure is avoided by limiting the size of the actual pre-vortex pressure.
In some embodiments, the adjusting the opening of the turbocharger according to the current operating condition of the vehicle includes: if the current running condition of the vehicle is an acceleration condition, determining a pressure correction coefficient according to the difference value; correcting the target pressure according to the pressure correction coefficient; and adjusting the opening of the turbocharger according to the corrected target pressure so as to adjust the actual pre-vortex pressure until the difference between the adjusted actual pre-vortex pressure and the pre-vortex pressure limit value is smaller than or equal to zero.
In some embodiments, the determining a pressure correction factor from the difference comprises: and inputting the difference value into a pre-trained difference value-pressure correction coefficient query model to obtain the corresponding pressure correction coefficient.
In some embodiments, the adjusting the opening of the turbocharger according to the current operating condition of the vehicle includes: and if the current running condition of the vehicle is a deceleration fuel cut-off condition or an in-situ idle condition, adjusting the opening of the turbocharger to a first preset opening, wherein the first preset opening is a pre-calibrated minimum required opening corresponding to the turbocharger under the deceleration fuel cut-off condition.
In some embodiments, the adjusting the opening of the turbocharger according to the current operating condition of the vehicle includes: if the current running condition of the vehicle is a deceleration fuel cut-off condition, comparing a first preset opening with a second preset opening, wherein the first preset opening is a pre-calibrated minimum required opening corresponding to the turbocharger under the deceleration fuel cut-off condition, and the second preset opening is a pre-calibrated required opening corresponding to the turbocharger when an anti-surge function is started; and if the first preset opening degree is equal to the second preset opening degree, adjusting the opening degree of the turbocharger to any one of the first preset opening degree and the second preset opening degree, otherwise, adjusting the opening degree of the turbocharger to the larger one of the first preset opening degree and the second preset opening degree.
In some embodiments, determining a current operating condition of the vehicle includes: if the current required oil injection quantity is greater than zero and the gear is not in the neutral gear, determining that the current running condition of the vehicle is an acceleration condition; if the current required fuel injection quantity is zero, determining that the current running working condition of the vehicle is a deceleration fuel cut-off working condition; and if the current required fuel injection quantity is greater than zero and the gear is in neutral gear, determining that the current running condition of the vehicle is an in-situ idling condition.
To achieve the above object, an embodiment of a second aspect of the present invention proposes an opening degree control device of a turbocharger, the device including: the acquisition module is used for acquiring the difference value between the actual pre-vortex pressure of the turbocharger and a preset pre-vortex pressure limit value; the judging module is used for judging whether the difference value is larger than zero or not; and the determining module is used for determining the current running condition of the vehicle when the difference value is greater than zero, adjusting the opening of the turbocharger according to the current running condition of the vehicle, and otherwise, adjusting the opening of the turbocharger according to the preset target pressure.
According to the opening control device of the turbocharger, the difference between the actual pre-vortex pressure of the turbocharger and the preset pre-vortex pressure limit value is obtained, and when the difference is larger than zero, the opening of the turbocharger is adjusted according to the current running condition of the vehicle, so that the control of the opening of the turbocharger is realized by setting the preset pre-vortex pressure limit value and based on the difference between the actual pre-vortex pressure and the preset pre-vortex pressure limit value, the situation that the actual pre-vortex pressure exceeds the hardware limit value of the turbocharger is avoided, the damage risk of the turbocharger is reduced while the cost is not increased, the running reliability of the turbocharger is improved, and the problem of engine flameout caused by abnormal opening of an exhaust valve due to higher actual pre-vortex pressure is avoided by limiting the size of the actual pre-vortex pressure.
To achieve the above object, an embodiment of a third aspect of the present invention proposes a turbocharger including: the opening degree control device of the turbocharger according to the above embodiment.
According to the turbocharger provided by the embodiment of the invention, the difference between the actual pre-vortex pressure of the turbocharger and the preset pre-vortex pressure limit value is obtained, and when the difference is larger than zero, the opening of the turbocharger is adjusted according to the current running condition of the vehicle, so that the control of the opening of the turbocharger is realized by setting the preset pre-vortex pressure limit value and based on the difference between the actual pre-vortex pressure and the preset pre-vortex pressure limit value, the situation that the actual pre-vortex pressure exceeds the hardware limit value of the turbocharger is avoided, the damage risk of the turbocharger is reduced while the cost is not increased, the running reliability of the turbocharger is improved, and the problem of engine flameout caused by abnormal opening of an exhaust valve due to higher actual pre-vortex pressure is avoided.
To achieve the above object, an embodiment of a third aspect of the present invention proposes a vehicle including: the turbocharger of the above embodiment.
According to the vehicle provided by the embodiment of the invention, the difference between the actual pre-vortex pressure of the turbocharger and the preset pre-vortex pressure limit value is obtained, and when the difference is larger than zero, the opening of the turbocharger is adjusted according to the current operation working condition of the vehicle, so that the control of the opening of the turbocharger is realized by setting the preset pre-vortex pressure limit value and based on the difference between the actual pre-vortex pressure and the preset pre-vortex pressure limit value, the situation that the actual pre-vortex pressure exceeds the hardware limit value of the turbocharger is avoided, the damage risk of the turbocharger is reduced while the cost is not increased, the operation reliability of the turbocharger is improved, and the problem of engine flameout caused by abnormal opening of an exhaust valve due to higher actual pre-vortex pressure is avoided by limiting the magnitude of the actual pre-vortex pressure.
To achieve the above object, an embodiment of a fifth aspect of the present invention proposes a computer-readable storage medium having stored thereon an opening degree control program of a turbocharger, which when executed by a processor, implements the opening degree control method of the turbocharger as described in the above embodiment.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic view of the basic structure of a turbocharger;
FIG. 2 is a schematic view of the structure of the nozzle ring when fully opened;
FIG. 3 is a schematic view of the structure of the nozzle ring when fully closed;
Fig. 4 is a flowchart of a method of controlling an opening degree of a turbocharger according to an embodiment of the invention;
fig. 5 is a flowchart of a method of controlling an opening degree of a turbocharger according to an embodiment of the invention;
Fig. 6 is a block diagram of an opening degree control device of a turbocharger according to an embodiment of the invention;
FIG. 7 is a block diagram of a turbocharger according to one embodiment of the invention;
Fig. 8 is a block diagram of a vehicle according to one embodiment of the invention.
Detailed Description
Embodiments of the present invention will be described in detail below, by way of example with reference to the accompanying drawings.
The specific structure of the turbocharger concerned will be first described. As shown in fig. 1, a basic structure of the turbocharger is schematically shown. As shown in conjunction with fig. 1 and 2, the turbocharger includes: the compressor 1, the fresh air inlet 2, the fresh air outlet 3, the intermediate connecting shaft 4 of the turbine and the pinch roller, the exhaust gas inlet 5, the turbine 6, the exhaust gas outlet 7, the turbine housing 8, the turbine 9, the nozzle ring 10 and the exhaust gas flow passage 11 are all described as a compressor pre-pressure, for example, P1, a compressor post-pressure, for example, P2, a turbine pre-pressure, for example, P3, a turbine post-pressure, for example, P4, and the opening of the turbocharger, i.e., the angle of the nozzle ring 10.
Specifically, as shown in fig. 2, a schematic view of the structure of the nozzle ring when it is fully opened is shown. The angle of the nozzle ring 10 can be continuously operated by 100% -0% through the motor, and when the angle of the nozzle ring 10 is 100%, the nozzle ring is considered to be fully opened, and at this time, the air flow channel is widest, the air flow resistance is small, the air flow velocity is small, and the pressurizing capacity is weak.
As shown in fig. 3, the structure of the nozzle ring is schematically shown when the nozzle ring is fully closed. The angle of the nozzle ring 10 can be continuously operated by 100% -0% through the motor, when the angle of the nozzle ring 10 is 0%, the nozzle ring is considered to be completely closed, and at the moment, the air flow channel is narrowest, the air flow resistance is large, the air flow speed is high, and the pressurizing capacity is strong.
Based on the method, the opening of the turbocharger is controlled based on the difference value between the actual pre-vortex pressure and the preset pre-vortex pressure limit value, so that the control of the opening of the turbocharger by the post-pressure and the pre-vortex pressure is realized, the actual pre-vortex pressure is dynamically monitored according to the working condition of the vehicle operation, the actual pre-vortex pressure is prevented from exceeding the hardware limit value of the turbocharger, the damage risk of the turbocharger is reduced while the cost is not increased, and the operation reliability of the turbocharger is further improved.
The opening degree control method of the turbocharger according to the embodiment of the invention will be described below.
Next, a method for controlling the opening degree of the turbocharger according to an embodiment of the invention will be described with reference to fig. 4 and 5, and as shown in fig. 4, the method for controlling the opening degree of the turbocharger according to an embodiment of the invention at least includes steps S1 to S4.
Step S1, obtaining a difference value between the actual pre-vortex pressure of the turbocharger and a preset pre-vortex pressure limit value.
The preset pre-vortex pressure limit value is for example marked as A, the actual pre-vortex pressure is for example marked as P3, the preset pre-vortex pressure limit value A is the maximum pre-vortex pressure calibrated and stored in advance, and the preset pre-vortex pressure limit value A and the magnitude of the actual pre-vortex pressure P3 are related to the opening degree of the turbocharger.
In an embodiment, an ECU (Electronic Control Unit, an electronic control unit) monitors the actual pre-vortex pressure of the turbocharger in real time, calculates the difference between the actual pre-vortex pressure P3 of the turbocharger and a preset pre-vortex pressure limit value a after acquiring the two, and facilitates improvement of the control accuracy of the opening degree of the turbocharger in the subsequent control process by calculating the difference between the two.
And S2, judging whether the difference value is larger than zero.
In an embodiment, after determining a difference between an actual pre-vortex pressure P3 of the turbocharger and a preset pre-vortex pressure limit a, if the difference is greater than zero, the actual pre-vortex pressure P3 is considered to be greater than the preset pre-vortex pressure limit a; if the difference is smaller than or equal to zero, the actual pre-vortex pressure P3 is considered to be smaller than or equal to the preset pre-vortex pressure limit value A, and the relationship between the actual pre-vortex pressure P3 and the preset pre-vortex pressure limit value A is conveniently determined by judging the relationship between the difference and zero, and corresponding control is performed.
And S3, if so, determining the current running condition of the vehicle, adjusting the opening of the turbocharger according to the current running condition, and otherwise, adjusting the opening of the turbocharger according to the preset target pressure.
The purpose of adjusting the opening of the turbocharger is to adjust the opening of the turbocharger to a target demand opening, and it can be understood that the target demand opening is an ideal opening when the turbocharger can normally operate and cannot exceed a hardware limit value, and when the opening of the turbocharger is the target demand opening, the turbocharger is in a normal operation state, and the actual pre-vortex pressure of the turbocharger cannot exceed the hardware limit of the turbocharger, and the risk of damage of the turbocharger cannot occur.
In the embodiment, when the difference value is greater than zero, the ECU determines the current running condition of the vehicle, the current running condition of the vehicle is different, and the strategies for adjusting the opening of the turbocharger are different.
When the difference is less than or equal to zero, the actual pre-vortex pressure is considered to be less than or equal to the preset pre-vortex pressure limit value, at this time, the actual pre-vortex pressure is small and does not exceed the hardware limit value, so that the opening of the turbocharger is directly adjusted according to the preset target post-pressure, for example, the opening of the turbocharger is adjusted to the target required opening, it can be understood that the preset target post-pressure is recorded as P2', and when the actual pre-vortex pressure P3 is small, the target required opening of the turbocharger is determined according to the requirement of the preset target post-pressure P2'. By determining the magnitude relation between the difference value and zero and adopting different control strategies, the target demand opening of the turbocharger is determined, and the problem that the turbocharger is damaged due to the fact that the same control strategy is always adopted to determine the target demand opening under different conditions is avoided, so that the failure rate of the turbocharger is reduced.
According to the opening control method of the turbocharger, the difference between the actual pre-vortex pressure of the turbocharger and the preset pre-vortex pressure limit value is obtained, and when the difference is larger than zero, the opening of the turbocharger is adjusted according to the current running condition of the vehicle, so that the control of the opening of the turbocharger is realized by setting the preset pre-vortex pressure limit value and based on the difference between the actual pre-vortex pressure and the preset pre-vortex pressure limit value, the situation that the actual pre-vortex pressure exceeds the hardware limit value of the turbocharger is avoided, the damage risk of the turbocharger is reduced while the cost is not increased, the running reliability of the turbocharger is improved, and the problem of engine flameout caused by abnormal opening of an exhaust valve due to higher actual pre-vortex pressure is avoided by limiting the size of the actual pre-vortex pressure.
In some embodiments, adjusting the opening of the turbocharger according to the current operating conditions of the vehicle includes: if the current running condition of the vehicle is an acceleration condition, determining a pressure correction coefficient according to the difference value; correcting the target pressure according to the pressure correction coefficient; and adjusting the opening of the turbocharger according to the corrected target pressure so as to adjust the actual pre-vortex pressure until the difference between the adjusted actual pre-vortex pressure and the pre-vortex pressure limit value is smaller than or equal to zero.
In an embodiment, when the difference value is greater than zero, the current running condition of the vehicle is judged, and when the running condition of the vehicle is determined to be an acceleration condition, in order to ensure the stability and the dynamic performance of the driving of the vehicle to the maximum extent, a pressure correction coefficient is determined according to the difference value of the two, after the pressure correction coefficient is determined, the target post-pressure is corrected according to the pressure correction coefficient to obtain corrected target post-pressure, the opening of the turbocharger is adjusted according to the corrected target post-pressure to achieve the purpose of reducing the actual pre-vortex pressure, the actual pre-vortex pressure is considered not to exceed the hardware boundary value of the turbocharger until the difference value between the adjusted actual pre-vortex pressure and the preset pre-vortex pressure limit value is smaller than or equal to zero, and at the moment, the purpose of adjusting the opening of the currently corresponding turbocharger to the opening of the target requirement is considered to be completed. It can be understood that when the difference is greater than zero and the current running condition of the vehicle is an acceleration condition, the actual pre-vortex pressure is continuously adjusted by performing closed-loop control on the magnitude of the target post-pressure.
In some embodiments, determining the pressure correction factor from the difference comprises: and inputting the difference value into a pre-trained difference value-pressure correction coefficient query model to obtain a corresponding pressure correction coefficient.
In the embodiment, the pre-trained difference value and pressure correction coefficient query model is calibrated in advance through a large amount of experimental data and stored, after the difference value is determined, the pressure correction coefficient corresponding to the difference value can be determined according to the difference value, and after the pressure correction coefficient is determined, the correction of the target post-pressure can be realized.
In some embodiments, adjusting the opening of the turbocharger according to the current operating conditions of the vehicle includes: and if the current operation condition is a deceleration fuel cut-off condition or an in-situ idle condition, adjusting the opening of the turbocharger to a first preset opening, wherein the first preset opening is a pre-calibrated minimum required opening corresponding to the turbocharger under the deceleration fuel cut-off condition.
In an embodiment, the first preset opening is a pre-calibrated opening value, that is, a pre-calibrated minimum required opening of the turbocharger under the deceleration fuel cut-off working condition, when the difference value is greater than zero, the current running working condition of the vehicle is judged, and when the current running working condition of the vehicle is the deceleration fuel cut-off working condition or the in-situ idling working condition, the opening of the turbocharger is directly limited to the first preset opening, so that the opening of the turbocharger is adjusted to the target required opening, the situation that the actual turbopressure is too large due to the fact that the opening of the turbocharger is too small, and flameout caused by abnormal exhaust after the accelerator is loosened is avoided, and therefore the running reliability of the turbocharger is improved.
In some embodiments, adjusting the opening of the turbocharger according to the current operating conditions of the vehicle includes: if the current running condition of the vehicle is a deceleration fuel cut-off condition, comparing a first preset opening with a second preset opening, wherein the first preset opening is a pre-calibrated minimum required opening corresponding to the turbocharger under the deceleration fuel cut-off condition, and the second preset opening is a pre-calibrated required opening corresponding to the turbocharger when the anti-surge function is started; and if the first preset opening degree is equal to the second preset opening degree, adjusting the opening degree of the turbocharger to any one of the first preset opening degree and the second preset opening degree, otherwise, adjusting the opening degree of the turbocharger to the larger one of the first preset opening degree and the second preset opening degree.
In an embodiment, if the current working condition of the vehicle is a deceleration fuel cut-off working condition, it is considered that a surge phenomenon may occur in the turbocharger during the deceleration fuel cut-off process of the vehicle, at this time, an anti-surge function of the ECU triggers, the magnitude of the first preset opening and the second preset opening is compared, if the first preset opening and the second preset opening are not equal, the opening of the turbocharger is adjusted to a larger one of the first preset opening and the second preset opening, and if the first preset opening and the second preset opening are equal, the opening of the turbocharger is adjusted to any one of the first preset opening and the second preset opening, so that under the deceleration fuel cut-off working condition, by determining a larger one of the first preset opening and the second preset opening as a target required opening, the actual pre-turbocharger pressure can be reduced, and the surge phenomenon can be avoided.
In some embodiments, determining a current operating condition of the vehicle includes: if the current required oil injection quantity is greater than zero and the gear is not in the neutral gear, determining that the current operation working condition is an acceleration working condition; if the current required oil injection quantity is zero, determining the current operation working condition as a deceleration fuel cut-off working condition; and if the fuel injection quantity of the current demand is greater than zero and the gear is in neutral gear, determining that the current operation working condition is an in-situ idle working condition.
In an embodiment, a current running condition of the vehicle is related to a current required fuel injection amount and a gear, and if the current required fuel injection amount is detected to be greater than zero and the gear is not in a neutral gear, the current running condition is determined to be an acceleration condition; if the fuel injection quantity required at present is detected to be equal to zero and the gear is in neutral gear, determining that the current operation working condition is a deceleration fuel cut-off working condition; and if the fuel injection quantity of the current demand is greater than zero and the gear is in neutral gear, determining that the current operation working condition is an in-situ idle working condition. And determining the current running condition of the vehicle by judging the fuel injection quantity and the gear of the current demand. It can be understood that the current running condition of the vehicle can be determined by judging the conditions of the increase of the vehicle speed, the accelerator opening and the like.
Next, an opening degree control method of a turbocharger according to an embodiment of the invention will be described by way of example with reference to fig. 5, and as shown in fig. 5, a flowchart of an opening degree control method of a turbocharger according to an embodiment of the invention will be described.
Step S11, acquiring the actual pre-vortex pressure of the turbocharger and a preset pre-vortex pressure limit value.
Step S12, calculating a difference between the actual pre-turbo pressure of the turbocharger and a preset pre-turbo pressure limit.
Step S13, judging whether the difference is larger than zero, if so, executing step S14, otherwise, executing step S17.
Step S14, judging whether the current running condition of the vehicle is an acceleration condition, if so, executing step S15, and if not, executing step S18.
And S15, determining a pressure correction coefficient according to the difference value, and correcting the target pressure according to the pressure correction coefficient.
And S16, adjusting the actual pre-vortex pressure until the difference value between the adjusted actual pre-vortex pressure and the pre-vortex pressure limit value is smaller than or equal to zero.
Step S17, adjusting the opening degree of the turbocharger according to the preset target pressure.
And S18, if the current running condition of the vehicle is a deceleration fuel cut-off condition or an in-situ idling condition, adjusting the opening of the turbocharger to a first preset opening.
Step S19, if the current running condition of the vehicle is a deceleration fuel cut-off condition, the opening of the turbocharger is adjusted to be larger one of a first preset opening and a second preset opening.
According to the opening control method of the turbocharger, the difference between the actual pre-vortex pressure of the turbocharger and the preset pre-vortex pressure limit value is obtained, and when the difference is larger than zero, the opening of the turbocharger is adjusted according to the current running condition of the vehicle, so that the control of the opening of the turbocharger is realized by setting the preset pre-vortex pressure limit value and based on the difference between the actual pre-vortex pressure and the preset pre-vortex pressure limit value, the situation that the actual pre-vortex pressure exceeds the hardware limit value of the turbocharger is avoided, the damage risk of the turbocharger is reduced while the cost is not increased, the running reliability of the turbocharger is improved, and the problem of engine flameout caused by abnormal opening of an exhaust valve due to higher actual pre-vortex pressure is avoided by limiting the size of the actual pre-vortex pressure.
An opening degree control device of a turbocharger according to an embodiment of the present invention is described below.
As shown in fig. 6, the opening degree control device 30 of the turbocharger of the present invention includes: the device comprises an acquisition module 31, a judging module 32 and a determining module 33, wherein the acquisition module 31 is used for acquiring a difference value between the actual pre-vortex pressure of the turbocharger and a preset pre-vortex pressure limit value; the judging module 32 is configured to judge whether the difference is greater than zero; the determining module 33 is configured to determine a current operating condition of the vehicle when the difference is greater than zero, and adjust the opening of the turbocharger according to the current operating condition of the vehicle, or adjust the opening of the turbocharger according to a preset target post-pressure.
According to the opening control device 30 of the turbocharger, the difference between the actual pre-vortex pressure of the turbocharger and the preset pre-vortex pressure limit value is obtained, and when the difference is larger than zero, the opening of the turbocharger is adjusted according to the current operation condition of the vehicle, so that the control of the opening of the turbocharger is realized by setting the preset pre-vortex pressure limit value and based on the difference between the actual pre-vortex pressure and the preset pre-vortex pressure limit value, the situation that the actual pre-vortex pressure exceeds the hardware limit value of the turbocharger is avoided, the damage risk of the turbocharger is reduced while the cost is not increased, the operation reliability of the turbocharger is improved, and the problem of engine flameout caused by abnormal opening of an exhaust valve due to higher actual pre-vortex pressure is avoided by limiting the magnitude of the actual pre-vortex pressure.
In some embodiments, the determining module 33 is specifically configured to: if the current operation condition is an acceleration condition, determining a pressure correction coefficient according to the difference value; correcting the target pressure according to the pressure correction coefficient; and adjusting the opening of the turbocharger according to the corrected target pressure so as to adjust the actual pre-vortex pressure until the difference between the adjusted actual pre-vortex pressure and the pre-vortex pressure limit value is smaller than or equal to zero.
In some embodiments, the determining module 33 is specifically configured to: and inputting the difference value into a pre-trained difference value-pressure correction coefficient query model to obtain a corresponding pressure correction coefficient.
In some embodiments, the determining module 33 is specifically configured to: and if the current running condition of the vehicle is a deceleration fuel cut-off condition or an in-situ idling condition, adjusting the opening of the turbocharger to a first preset opening, wherein the first preset opening is a pre-calibrated minimum required opening corresponding to the turbocharger under the deceleration fuel cut-off condition.
In some embodiments, the determining module 33 is further configured to: if the current running condition of the vehicle is a deceleration fuel cut-off condition, comparing a first preset opening with a second preset opening, wherein the first preset opening is a pre-calibrated minimum required opening corresponding to the turbocharger under the deceleration fuel cut-off condition, and the second preset opening is a pre-calibrated required opening corresponding to the turbocharger when the anti-surge function is started; and if the first preset opening degree is equal to the second preset opening degree, adjusting the opening degree of the turbocharger to any one of the first preset opening degree and the second preset opening degree, otherwise, adjusting the opening degree of the turbocharger to the larger one of the first preset opening degree and the second preset opening degree.
In some embodiments, the determining module 33 is specifically configured to: if the current required oil injection quantity is greater than zero and the gear is not in the neutral gear, determining that the current operation working condition is an acceleration working condition; if the current required oil injection quantity is zero, determining the current operation working condition as a deceleration fuel cut-off working condition; and if the fuel injection quantity of the current demand is greater than zero and the gear is in neutral gear, determining that the current operation working condition is an in-situ idle working condition.
A turbocharger according to an embodiment of the present invention is described below.
As shown in fig. 7, a turbocharger 40 of an embodiment of the invention includes: the opening degree control device 30 of the turbocharger of the above embodiment.
According to the turbocharger 40 of the embodiment of the invention, the difference between the actual pre-vortex pressure of the turbocharger and the preset pre-vortex pressure limit value is obtained, and when the difference is larger than zero, the opening of the turbocharger is adjusted according to the current running condition of the vehicle, so that the control of the opening of the turbocharger is realized by setting the preset pre-vortex pressure limit value and based on the difference between the actual pre-vortex pressure and the preset pre-vortex pressure limit value, the situation that the actual pre-vortex pressure exceeds the hardware limit value of the turbocharger is avoided, the damage risk of the turbocharger is reduced while the cost is not increased, the running reliability of the turbocharger is improved, and the problem of engine flameout caused by abnormal opening of an exhaust valve due to higher actual pre-vortex pressure is avoided by limiting the magnitude of the actual pre-vortex pressure.
A vehicle of an embodiment of the invention is described below.
As shown in fig. 8, a vehicle 50 of an embodiment of the invention includes: the turbocharger 40 of the above embodiment.
According to the vehicle 50 of the embodiment of the invention, the difference between the actual pre-vortex pressure of the turbocharger and the preset pre-vortex pressure limit value is obtained, and when the difference is larger than zero, the opening of the turbocharger is adjusted according to the current operation condition of the vehicle, so that the control of the opening of the turbocharger is realized by setting the preset pre-vortex pressure limit value and based on the difference between the actual pre-vortex pressure and the preset pre-vortex pressure limit value, the situation that the actual pre-vortex pressure exceeds the hardware limit value of the turbocharger is avoided, the damage risk of the turbocharger is reduced while the cost is not increased, the operation reliability of the turbocharger is improved, and the problem of engine flameout caused by abnormal opening of an exhaust valve due to higher actual pre-vortex pressure is avoided by limiting the magnitude of the actual pre-vortex pressure.
In order to achieve the above object, an embodiment of a fifth aspect of the present invention proposes a computer-readable storage medium having stored thereon an opening degree control program of a turbocharger, which when executed by a processor, implements the opening degree control method of the turbocharger as in the above embodiment.
In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the invention, the scope of which is defined by the claims and their equivalents.
Claims (9)
1. A method for controlling an opening degree of a turbocharger, comprising:
acquiring a difference value between the actual pre-vortex pressure of the turbocharger and a preset pre-vortex pressure limit value;
Judging whether the difference is larger than zero or not;
If so, determining the current running condition of the vehicle, adjusting the opening of the turbocharger according to the current running condition of the vehicle, otherwise, adjusting the opening of the turbocharger according to the preset target pressure after-pressure, wherein,
The adjusting the opening of the turbocharger according to the current running condition of the vehicle comprises the following steps: if the current running condition of the vehicle is an acceleration condition, determining a pressure correction coefficient according to the difference value; correcting the target pressure according to the pressure correction coefficient; and adjusting the opening of the turbocharger according to the corrected target pressure so as to adjust the actual pre-vortex pressure until the difference between the adjusted actual pre-vortex pressure and the pre-vortex pressure limit value is smaller than or equal to zero.
2. The method of controlling the opening degree of a turbocharger according to claim 1, wherein the determining a pressure correction coefficient based on the difference value includes:
And inputting the difference value into a pre-trained difference value-pressure correction coefficient query model to obtain the corresponding pressure correction coefficient.
3. The method for controlling the opening degree of the turbocharger according to claim 1, wherein the adjusting the opening degree of the turbocharger according to the current operation condition of the vehicle includes:
And if the current running condition of the vehicle is a deceleration fuel cut-off condition or an in-situ idle condition, adjusting the opening of the turbocharger to a first preset opening, wherein the first preset opening is a pre-calibrated minimum required opening corresponding to the turbocharger under the deceleration fuel cut-off condition.
4. The method for controlling the opening degree of the turbocharger according to claim 1, wherein the adjusting the opening degree of the turbocharger according to the current operation condition of the vehicle includes:
If the current running condition of the vehicle is a deceleration fuel cut-off condition, comparing a first preset opening with a second preset opening, wherein the first preset opening is a pre-calibrated minimum required opening corresponding to the turbocharger under the deceleration fuel cut-off condition, and the second preset opening is a pre-calibrated required opening corresponding to the turbocharger when an anti-surge function is started;
And if the first preset opening degree is equal to the second preset opening degree, adjusting the opening degree of the turbocharger to any one of the first preset opening degree and the second preset opening degree, otherwise, adjusting the opening degree of the turbocharger to the larger one of the first preset opening degree and the second preset opening degree.
5. The method of controlling the opening degree of a turbocharger according to claim 1, wherein determining the current operating condition of the vehicle includes:
if the current required oil injection quantity is greater than zero and the gear is not in the neutral gear, determining that the current running condition of the vehicle is an acceleration condition;
if the current required fuel injection quantity is zero, determining that the current running working condition of the vehicle is a deceleration fuel cut-off working condition;
And if the current required fuel injection quantity is greater than zero and the gear is in neutral gear, determining that the current running condition of the vehicle is an in-situ idling condition.
6. An opening degree control device of a turbocharger, comprising:
the acquisition module is used for acquiring the difference value between the actual pre-vortex pressure of the turbocharger and a preset pre-vortex pressure limit value;
the judging module is used for judging whether the difference value is larger than zero or not;
a determining module, configured to determine a current operating condition of the vehicle when the difference is greater than zero, and adjust an opening of the turbocharger according to the current operating condition of the vehicle, or adjust the opening of the turbocharger according to a preset target pressure after-pressure,
The adjusting the opening of the turbocharger according to the current running condition of the vehicle comprises the following steps: if the current running condition of the vehicle is an acceleration condition, determining a pressure correction coefficient according to the difference value; correcting the target pressure according to the pressure correction coefficient; and adjusting the opening of the turbocharger according to the corrected target pressure so as to adjust the actual pre-vortex pressure until the difference between the adjusted actual pre-vortex pressure and the pre-vortex pressure limit value is smaller than or equal to zero.
7. A turbocharger, characterized by comprising:
The opening degree control device of a turbocharger according to claim 6.
8. A vehicle, characterized by comprising: the turbocharger as in claim 7.
9. A computer-readable storage medium, wherein an opening degree control program of a turbocharger is stored on the computer-readable storage medium, which when executed by a processor, implements the opening degree control method of the turbocharger according to any one of claims 1 to 5.
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