CN111911281B - Turbocharger control method and device and storage medium - Google Patents
Turbocharger control method and device and storage medium Download PDFInfo
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- CN111911281B CN111911281B CN202010736918.8A CN202010736918A CN111911281B CN 111911281 B CN111911281 B CN 111911281B CN 202010736918 A CN202010736918 A CN 202010736918A CN 111911281 B CN111911281 B CN 111911281B
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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
- F02B37/18—Control of the pumps by bypassing exhaust from the inlet to the outlet of turbine or to the atmosphere
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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
- F02B2037/122—Control of rotational speed of the pump
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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 turbocharger control method, a turbocharger control device and a storage medium, wherein the method comprises the following steps: when the vehicle decelerates and retracts the accelerator, determining the required air inflow of the engine, determining the rotating speed of the turbocharger according to the required air inflow of the engine, and adjusting a waste gate of the turbocharger to enable the turbocharger to work at the rotating speed; according to the invention, the rotating speed of the turbocharger is determined according to the air inflow requirement of the engine, and the rotating speed of the turbocharger is controlled through linkage between the rotating speed of the turbocharger and a waste gate, so that the turbocharger has a certain rotating speed when an accelerator is closed, and the turbocharger can quickly reach a target working state when accelerating next time, thereby reducing the delay generated when the turbocharger reaches the target working state from a very low rotating speed, reducing the delay phenomenon of the turbocharger during accelerating on the premise of not increasing the cost and the oil consumption, improving the acceleration responsiveness of the engine and further improving the power performance of the engine.
Description
Technical Field
The invention relates to the field of supercharged engines, in particular to a turbocharger control method and device and a storage medium.
Background
In the running process of a vehicle, the acceleration responsiveness of an engine is very critical to the power performance of the whole vehicle, and the power performance of the whole vehicle is related to the driving experience of a user, so that the acceleration responsiveness of the engine needs to be continuously improved to meet the increasingly harsh driving requirements of the user.
For a supercharged engine, the power performance of the supercharged engine depends on a turbocharger to increase the air intake of the engine so as to achieve larger power output, and the turbocharger needs to reach a certain rotating speed to play a role in increasing the air intake of the engine. The rotating speed of the turbocharger depends on the amount of exhaust gas generated by the engine and the opening degree of a waste gas gate in the turbocharger, when the vehicle decelerates and receives the accelerator, the waste gas gate can be directly opened to the maximum position (the opening degree of the waste gas gate is maximum), so that the rotating speed of the turbocharger suddenly drops, at the moment, when the engine needs quick power output, the rotating speed of the turbocharger running from a lower rotating speed to the acting rotating speed needs a certain time, so that a turbocharger turbine generates a hysteresis phenomenon, the supercharged engine cannot quickly output required power, the accelerated responsiveness of the supercharged engine is influenced by the hysteresis phenomenon of the turbocharger, and the accelerated responsiveness of the supercharged engine is reduced.
In view of the turbocharger lag, the prior art generally starts with a turbine, an impeller and a turbocharger bearing system, and reduces the overall rotational inertia of the turbocharger to improve the overall power performance. However, these methods have major drawbacks, for example, the turbocharger adopts a lightweight material design, but the lightweight material has high use requirements, which leads to a sudden increase in cost. Therefore, a low-cost solution is needed to improve the acceleration response performance of a supercharged engine and further improve the power performance of the engine in response to the turbocharger lag phenomenon.
Disclosure of Invention
The invention provides a control method and device of a turbocharger and a storage medium, and aims to solve the technical problem that in the prior art, the power performance of the supercharged engine is reduced due to the influence of the turbocharger delay phenomenon on the acceleration responsiveness of the supercharged engine.
A turbocharger control method, comprising:
when the vehicle decelerates and retracts the accelerator, determining the required air inflow of the engine;
determining the rotation speed of the turbocharger according to the required air inflow of the engine;
adjusting a wastegate of the turbocharger to operate the turbocharger at the rotational speed.
Further, the determining the rotation speed of the turbocharger according to the demanded intake air amount of the engine includes:
determining a compressor pressure ratio of the engine, wherein the compressor pressure ratio is a gas pressure ratio of the compressed gas of the compressor to the gas pressure before compression;
and determining the rotating speed according to the compressor pressure ratio and the required air inflow.
Further, the determining the rotation speed of the turbocharger according to the compressor pressure ratio and the required intake air amount includes:
acquiring preset turbocharger rotating speed data, wherein the turbocharger rotating speed data is corresponding relation data of the compressor pressure ratio, the required air inflow of the engine and the rotating speed of the turbocharger;
and inquiring the turbocharger rotating speed data according to the compressor pressure ratio and the required air inflow so as to determine the rotating speed.
Further, the turbocharger speed data is obtained by:
performing a flow characteristic and efficiency characteristic test of the compressor to obtain compressor pressure ratio data and compressor flow data of the compressor under different working conditions;
acquiring the rotating speed data of the turbocharger under different working conditions;
Taking the compressor flow data as required air inflow data of the engine;
and acquiring the rotating speed data of the turbocharger according to the pressure ratio data of the compressor under different working conditions, the required air inflow data of the engine and the rotating speed data of the turbocharger.
Further, the determining a compressor pressure ratio of the engine comprises:
acquiring an intake pressure at the engine air filter;
acquiring the air inlet pressure behind the intercooler of the turbocharger;
and determining the compressor pressure ratio of the engine according to the air inlet pressure at the air filter and the air inlet pressure after the intercooler.
Further, the determining a required intake air amount of the engine includes:
determining the air-fuel ratio, power and oil consumption of the engine;
and determining the required air inflow of the engine according to the air-fuel ratio, power and oil consumption of the engine.
A turbocharger control apparatus comprising:
the first determination module is used for determining the required air inflow of the engine when the vehicle decelerates and retracts the accelerator;
a second determination module for determining a rotational speed of the turbocharger based on a demanded intake air amount of the engine;
An adjustment module adjusts a wastegate of the turbocharger to cause the turbocharger to operate at the rotational speed.
Further, the second determining module is specifically configured to:
determining a compressor pressure ratio of the engine, wherein the compressor pressure ratio is a gas pressure ratio of the compressor after compression to the compressor before compression;
and determining the rotating speed according to the compressor pressure ratio and the required air inflow.
A computer device comprising a memory, a processor and a computer program stored in said memory and executable on said processor, said processor implementing the steps of the turbocharger control method described above when executing said computer program.
A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the steps of the above-mentioned turbocharger control method.
In one scheme provided by the control method, the control device and the storage medium of the turbocharger, when a vehicle decelerates and receives an accelerator, the required air inflow of an engine is determined, the rotating speed of the turbocharger is determined according to the required air inflow of the engine, and a waste gate of the turbocharger is adjusted to enable the turbocharger to work at the rotating speed; according to the invention, when the vehicle decelerates and retracts the accelerator, the rotating speed of the turbocharger is determined according to the air inflow requirement of the engine, and the rotating speed of the turbocharger is controlled through linkage between the rotating speed of the turbocharger and the waste gate, so that the turbocharger has a certain rotating speed when retracting the accelerator, and the turbocharger can rapidly reach a target working state when accelerating next time, thereby reducing the delay generated when the turbocharger reaches the target working state from a very low rotating speed, reducing the delay phenomenon when accelerating the turbocharger on the premise of not increasing the cost and the oil consumption, improving the acceleration responsiveness of the engine and further improving the power performance of the engine.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor.
FIG. 1 is a schematic view of a turbocharger according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart of a turbocharger control method according to an embodiment of the present invention;
FIG. 3 is a flowchart illustrating an implementation of step S10 in FIG. 2;
FIG. 4 is a flowchart illustrating an implementation of step S20 in FIG. 2;
FIG. 5 is a flowchart illustrating an implementation of step S22 in FIG. 4;
FIG. 6 is a schematic view showing the structure of a turbocharger control apparatus according to an embodiment of the present invention;
fig. 7 is another schematic structural view of a turbocharger control apparatus according to an embodiment of the present invention.
Wherein, in the figures, the respective reference numerals:
1-a motor; 2-a connecting rod; 3-motor end rocker arm; 4-a volute; 5-shaft sleeve; 6-a vortex end rocker arm; 7-a waste gate; 8-wastegate shaft.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.
The turbocharger control method provided by the embodiment of the invention can be applied to a turbocharger control system, and the turbocharger control system comprises an engine, a waste gate, a turbocharger and a turbocharger control device. Wherein, the waste gate is the waste gate of the turbocharger, the turbocharger is shown in figure 1, and comprises a motor 1, a connecting rod 2, a motor end rocker arm 3, a volute 4, a shaft sleeve 5, a vortex end rocker arm 6, a waste gate 7 and a waste gate shaft 8, the motor 1 is connected with the motor end rocker arm 3, the vortex end rocker arm 6 is pushed to rotate by the connecting rod 2, the vortex end rocker arm 6 is connected with the waste gate shaft 8, the vortex end rocker arm 6 moves to rotate the waste gate shaft 8 so as to drive the waste gate 7 to rotate, the air leakage quantity passing through the volute 4 can be adjusted by the rotation of the waste gate 7, the rotating speed of the turbocharger can be controlled, the rotating speed of the turbocharger reaches the expected rotating speed, when the engine needs quick power output, the time of accelerating the turbocharger to the target rotating speed is reduced so as to enable the turbocharger to quickly reach the working state, and the delay of the rotating speed of the turbocharger from a very low rotating speed to the working state is avoided, thereby improving the acceleration responsiveness of the engine.
When the vehicle decelerates and retracts the accelerator during the running of the whole vehicle, the torque demand of the engine is reduced, the air intake quantity demand of the engine is reduced, the boost pressure of the corresponding required turbocharger is reduced, and therefore the rotating speed of the turbocharger is correspondingly reduced. In the turbocharger control system, when a vehicle decelerates and retracts the accelerator, the required air inflow of the engine is determined, the rotating speed of the turbocharger is determined according to the required air inflow of the engine, and the waste gate of the turbocharger is adjusted to enable the turbocharger to work at the rotating speed, so that the rotating speed of the turbocharger is kept at a proper rotating speed, the delay generated when the turbocharger accelerates next time is reduced, the acceleration response of the engine is improved, and the power performance of the engine is further improved.
In this embodiment, the turbocharger control system including the engine, the wastegate and the turbocharger is merely exemplary, and in other embodiments, the turbocharger control system further includes other devices, which are not described herein.
In an embodiment, as shown in fig. 2, a turbocharger control method is provided, which is described by taking a turbocharger control device applied in a turbocharger control system as an example, and specifically includes the following steps:
S10: when the vehicle is decelerated to throttle back, the required intake air amount of the engine is determined.
When the vehicle decelerates and accelerator is closed, the required air inflow of the engine is firstly determined, so that the rotating speed of the turbocharger is determined according to the required air inflow of the engine, the turbocharger is further controlled to work at the determined rotating speed, and the aim of reducing the delay of the turbocharger in the next acceleration is fulfilled.
Wherein the required intake air amount of the engine may be calculated by an electronic control unit ECU based on an operating parameter of the engine to obtain. In the present embodiment, the turbocharger control device is described as an example of an ECU, but in other embodiments, the turbocharger control device may be another vehicle device.
S20: the rotational speed of the turbocharger is determined according to the demanded intake air amount of the engine.
The amount of intake air of the engine depends on the rotation speed of the turbocharger, and after the required intake air amount of the engine is determined, the rotation speed of the turbocharger can be determined by reversing the required intake air amount of the engine, wherein the rotation speed of the turbocharger is determined according to the required intake air amount of the engine to be greater than the rotation speed of the turbocharger when the waste gate is at the maximum opening position.
For example, the ECU queries preset turbocharger data according to the required intake air amount of the engine to obtain the rotation speed of the turbocharger corresponding to the required intake air amount of the engine. The turbocharger data is corresponding relation data between the required air inflow of the engine and the rotating speed of the turbocharger. The turbocharger data is obtained by testing the turbocharger, namely in the process of testing the turbocharger, the required air inflow of the engine under different working conditions and the corresponding rotating speed of the turbocharger are recorded, and finally the turbocharger data is obtained according to the required air inflow of the engine under different working conditions and the corresponding rotating speed of the turbocharger. The turbocharger data obtained by the test is inquired according to the required air inflow of the engine to obtain the rotating speed of the turbocharger, and the accuracy of the obtained rotating speed of the turbocharger is improved.
In this embodiment, the method for the ECU to query the preset turbocharger data to obtain the corresponding rotation speed of the turbocharger according to the required intake air amount of the engine is only an exemplary illustration, and in other embodiments, the manner for determining the rotation speed of the turbocharger according to the required intake air amount of the engine may be other, and will not be described herein again.
In this embodiment, the turbocharger data obtained by testing the turbocharger is only an exemplary description, and in other embodiments, the turbocharger data may also be obtained in other manners, which is not described herein again.
S30: the wastegate of the turbocharger is adjusted so that the turbocharger operates at a determined rotational speed.
After the rotation speed of the turbocharger is determined according to the required intake air quantity of the engine, the waste gate of the turbocharger is adjusted to enable the turbocharger to work at the determined rotation speed, namely the opening degree of the waste gate is adjusted, so that the rotation speed of the turbocharger is the rotation speed determined according to the required intake air quantity of the engine before the turbocharger accelerates next time. Therefore, the rotating speed of the turbocharger can be controlled to be a certain value every time the vehicle receives the accelerator, the rotating speed of the turbocharger can be rapidly increased when the engine is accelerated next time, the rotating speed delay of the turbocharger is reduced, and the responsiveness of the engine is improved.
In the embodiment, when the vehicle decelerates and retracts the accelerator, the rotating speed of the turbocharger is determined according to the requirement of the air inflow of the engine, and the rotating speed of the turbocharger is controlled through linkage between the rotating speed of the turbocharger and a waste gate, so that the turbocharger has certain rotating speed when the accelerator is retracted, the turbocharger can rapidly reach a target working state when accelerating next time, the delay of the turbocharger when reaching the target working state from a very low rotating speed is reduced, the delay phenomenon of the turbocharger during accelerating is reduced on the premise of not increasing the cost and the increase, the acceleration responsiveness of the engine is improved, and the power performance of the engine is improved.
In addition, the turbocharger control method provided by the embodiment can also reduce the abrasion of the waste valve shaft and the bush in the turbocharger, and simultaneously reduce the potential noise risk at each rocker arm and each connecting rod in the turbocharger. In the structure of the turbocharger, the amount of wear between the wastegate shaft and the bushing is formulated as follows:
wherein s is the sliding distance between the wastegate shaft and the bushing, F is the normal load, H is the hardness of the softer of the bushing and the wastegate shaft, and k is the wear coefficient.
When the wastegate is adjusted between the fully closed position and the maximum open position, the sliding distance between the wastegate shaft and the bushing will decrease in proportion to the decrease in wastegate opening, and the amount of wear of the wastegate shaft and the bushing will be proportional to the sliding distance, given the same other parameters, from the formula for the amount of wear. In the turbocharger control method provided by the embodiment, when the vehicle decelerates and retracts the accelerator, the position of the wastegate does not need to be adjusted to the position of the maximum opening degree, and the sliding distance between the wastegate shaft and the bushing is reduced when the opening degree of the wastegate is reduced, so that the turbocharger control method provided by the embodiment can reduce the sliding distance between the wastegate shaft and the bushing, and further reduce the abrasion between the wastegate shaft and the bushing in the life cycle.
Meanwhile, the opening degree of the waste gas door is reduced, the rotating angle of the connecting rod connected with the rocker arm is also reduced, and the relative sliding distance between the connecting rod and the rocker arm is in positive correlation with the rotating angle, so that the sliding distance between the rocker arm and the connecting rod can be reduced by the smaller opening degree of the waste gas door, the risk of noise generation between the rocker arm and the connecting rod can be reduced by the smaller sliding distance, namely, the working noise between the rocker arm and the connecting rod can be reduced by adjusting the opening degree range of the waste gas door according to the temperature of a catalyst, and the performance of the engine is further improved.
In one embodiment, when the vehicle is decelerated and throttled back, as shown in fig. 3, in step S10, that is, the required intake air amount of the engine is determined, the method specifically includes the following steps:
s11: the air-fuel ratio, power and fuel consumption of the engine are determined.
When the vehicle decelerates to retract the accelerator, the air-fuel ratio, power and oil consumption of the engine required at the moment are determined, so that the required air inflow of the engine is determined according to the air-fuel ratio, power and oil consumption of the engine.
The air-fuel ratio of the engine can be obtained by inquiring preset air-fuel ratio data of the engine, the power of the engine can be calculated according to an accelerator signal, the oil consumption of the engine can be obtained by inquiring preset oil consumption data of the engine, and the lowest oil consumption of an equal power line is taken as the oil consumption of the engine.
S12: and determining the required air inflow of the engine according to the air-fuel ratio, the power and the oil consumption of the engine.
After the air-fuel ratio, the power and the oil consumption of the engine are determined, the required air inflow of the engine is determined according to the air-fuel ratio, the power and the oil consumption of the engine, and the calculation formula is as follows:
mair＝λv*Lstoh*be*Pe
wherein m isairIs the demanded intake air quantity, lambda, of the enginevIs the air-fuel ratio of the engine, LstohTo the air excess factor, beFor the fuel consumption of the engine, PeIs the power of the engine.
In the embodiment, when the vehicle decelerates and retracts the accelerator, the air-fuel ratio, the power and the oil consumption of the engine are determined, the required air inflow of the engine is determined according to the air-fuel ratio, the power and the oil consumption of the engine, the process of determining the required air inflow of the engine is determined, and a basis is provided for determining the rotating speed of the turbocharger according to the required air inflow of the engine subsequently.
In one embodiment, the air-fuel ratio data and the oil consumption data of the engine can be obtained by testing the engine, and the air-fuel ratios of the engine under different working conditions are obtained as the air-fuel ratio data of the engine in the testing process; the oil consumption of the engine under different working conditions is obtained as oil consumption data of the engine, so that the accuracy of the obtained air-fuel ratio and oil consumption of the engine is improved, the accuracy of the required air inflow of the engine is further improved, and the accuracy of the rotating speed of the turbocharger is further improved.
In one embodiment, the engine air-fuel ratio map may be created based on the engine air-fuel ratio data, the engine fuel consumption map may be created based on the engine fuel consumption data, and the engine air-fuel ratio map and the engine fuel consumption map may be pre-loaded into the ECU. When the vehicle decelerates and receives the accelerator, the engine air-fuel ratio map in the query ECU is determined according to the current working condition of the vehicle to determine the required engine air-fuel ratio, the engine oil consumption required by the engine oil consumption map in the query ECU is determined according to the working condition of the previous vehicle, the required air inflow of the engine is further determined, the required engine air-fuel ratio and the engine oil consumption can be rapidly obtained by querying the engine air-fuel ratio map and the engine oil consumption map which are arranged in the ECU in advance, the efficiency of determining the required air inflow of the engine is improved, and the efficiency of determining the rotating speed of the turbocharger is further improved.
In one embodiment, when the vehicle is throttled back during deceleration, as shown in fig. 4, in step S20, the method determines the rotation speed of the turbocharger according to the demanded intake air amount of the engine, and specifically includes the following steps:
s21: and determining the compressor pressure ratio of the engine, wherein the compressor pressure ratio is the ratio of the gas pressure after the compressor compresses to the gas pressure before the compressor compresses.
It should be understood that, the turbocharger utilizes the inertia impulse force of the exhaust gas exhausted by the engine to push the turbine in the turbine chamber of the turbocharger, the turbine drives the coaxial compressor impeller, the impeller pumps the air sent by the air filter pipeline, so that the air is pressurized and enters the cylinder of the engine to push the engine to do work, when the rotating speed of the engine is increased, the exhaust gas exhausting speed of the engine and the rotating speed of the turbine are also increased synchronously, and the impeller compresses more air to enter the cylinder of the engine. Therefore, the need of the engineThe air inflow is obtained by an air compressor of the engine, when the vehicle decelerates and retracts the accelerator, the pressure ratio of the air compressor of the engine is determined, and the rotating speed of the turbocharger is determined according to the air inflow required by the engine and the pressure ratio of the air compressor, wherein the pressure ratio of the air compressor is the ratio of the air pressure after the air compressor compresses to the air pressure before the air compressor compresses, namely the pressure ratio of the air compressor is the total pressure P of the air at the outlet of the air compressor 2Total pressure P with inlet air1The compressor pressure ratio pi is P2/P1。
S22: and determining the rotating speed of the turbocharger according to the compressor pressure ratio and the required air inflow.
After the compressor pressure ratio of the engine is determined and the required air inflow of the engine is determined, the rotating speed of the turbocharger is determined according to the compressor pressure ratio and the required air inflow, and the accuracy of the rotating speed of the turbocharger is improved, so that the turbocharger works according to the more accurate rotating speed when the vehicle decelerates and receives the accelerator, and the delay generated when the turbocharger reaches the target working state from a very low rotating speed is further reduced.
In the embodiment, when the vehicle decelerates and retracts the accelerator, the compressor pressure ratio of the engine is determined, the compressor pressure ratio is the ratio of the gas pressure after the compressor is compressed to the gas pressure before the compressor is compressed, the rotating speed of the turbocharger is determined according to the compressor pressure ratio and the determined required air inflow, the accuracy of the rotating speed of the turbocharger is further improved, so that the turbocharger works according to the more accurate rotating speed when the vehicle decelerates and retracts the accelerator, the delay generated when the turbocharger reaches the target working state from a very low rotating speed is reduced, and the acceleration response of the turbocharger is further improved.
In an embodiment, in step S21, determining a compressor pressure ratio of the engine specifically includes the following steps:
s211: intake pressure at an engine air cleaner is obtained.
When the vehicle decelerates and retracts the accelerator, the pressure ratio of the compressor needs to be determined according to the pressure of the gas after the compressor of the engine compresses and before the compressor compresses, therefore, the pressure of the gas before the compressor compresses needs to be determined firstly, in the embodiment, the inlet pressure at the air filter of the engine is used as the inlet pressureGas pressure P before compressor compression1。
For example, the intake pressure at the engine air filter may be obtained by measuring the pressure with an intake pressure sensor at the engine air filter, so as to improve the accuracy of the gas pressure before compression by the gas compressor and further improve the accuracy of the pressure ratio of the gas compressor.
S212: and obtaining the air inlet pressure after the intercooler of the turbocharger.
After the intake pressure at the air filter of the engine is obtained, the intake pressure after the intercooler of the turbocharger is obtained as the compressed gas pressure P of the compressor 2。
Exemplarily, the pressure measurement is carried out to the pressure measurement of the pressure of admitting air behind the turbo charger intercooler through the pressure sensor of admitting air behind the turbo charger intercooler to improve the accuracy of the gas pressure after the compressor compression, and then improve the accuracy of the compressor pressure ratio, in other embodiments, the pressure of admitting air behind the turbo charger intercooler can also be obtained through other modes, and the description is omitted here.
S213: and determining the compressor pressure ratio of the engine according to the inlet air pressure at the air filter and the inlet air pressure after the intercooler.
After the intake pressure at the air filter and the intake pressure after the intercooler are obtained, a compressor pressure ratio of the engine is determined according to the intake pressure at the air filter and the intake pressure after the intercooler.
In the embodiment, the air inlet pressure at the air filter of the engine is obtained, the air inlet pressure after the intercooler of the turbocharger is obtained, the compressor pressure ratio of the engine is determined according to the air inlet pressure at the air filter and the air inlet pressure after the intercooler, and the process of determining the compressor pressure ratio of the engine is refined, so that the obtained compressor pressure ratio is closer to the actual working condition of the engine, the accuracy of the compressor pressure ratio is improved, and the accuracy of the rotating speed of the turbocharger is further improved.
In one embodiment, after obtaining the compressor pressure ratio of the engine and determining the required intake air amount of the engine, as shown in fig. 5, step S22, namely determining the rotation speed of the turbocharger according to the compressor pressure ratio and the required intake air amount, specifically comprises the following steps:
s221: and acquiring preset turbocharger rotating speed data, wherein the turbocharger rotating speed data is corresponding relation data of the pressure ratio of the gas compressor, the required air inflow of the engine and the rotating speed of the turbocharger.
After obtaining and determining the compressor pressure ratio of the engine and determining the required air inflow of the engine, preset turbocharger rotating speed data needs to be obtained first, so that the rotating speed of the turbocharger can be determined according to the compressor pressure ratio, the required air inflow of the engine and the preset turbocharger rotating speed data. The turbocharger rotating speed data is corresponding relation data of a compressor pressure ratio, required air inflow of an engine and rotating speed of the turbocharger.
S222: and inquiring the rotating speed data of the turbocharger according to the compressor pressure ratio and the required air inflow so as to determine the rotating speed of the turbocharger.
After the compressor pressure ratio of the engine is obtained and determined and the required air inflow of the engine is determined, the rotating speed of the turbocharger is determined according to the compressor pressure ratio, the required air inflow of the engine and preset rotating speed data of the turbocharger, the method is simple and rapid, and the efficiency of determining the rotating speed of the turbocharger is improved.
For example, the turbocharger rotating speed map can be made according to the turbocharger rotating speed data, the turbocharger rotating speed map is pre-arranged in the ECU, after the compressor pressure ratio of the engine is obtained and determined, the required air inflow of the engine is determined, the turbocharger rotating speed map in the ECU is inquired according to the compressor pressure ratio and the required air inflow of the engine, the rotating speed of the turbocharger is determined and executed, and the efficiency of determining the rotating speed of the turbocharger is further improved.
In the embodiment, after the compressor pressure ratio of the engine is obtained and determined, and the required air inflow of the engine is determined, the preset turbocharger rotating speed data is obtained, and the turbocharger rotating speed data is the corresponding relation data of the compressor pressure ratio, the required air inflow of the engine and the rotating speed of the turbocharger, so that the rotating speed of the turbocharger is determined by inquiring the turbocharger rotating speed data according to the compressor pressure ratio and the required air inflow, the process of determining the rotating speed of the turbocharger according to the compressor pressure ratio and the required air inflow of the engine is refined, the operation is simple and fast, and the efficiency of determining the rotating speed of the turbocharger is improved.
In one embodiment, the predetermined turbocharger speed data is obtained by:
S01: and performing flow characteristic and efficiency characteristic tests of the air compressor to obtain pressure ratio data and flow data of the air compressor under different working conditions.
It should be understood that, in the tests of the flow characteristic and the efficiency characteristic of the compressor of the engine, when high-pressure air provided by an external air source flows through the combustion chamber, the high-pressure air is mixed with gas sprayed into the combustion chamber to be combusted and then supplied to the turbine, so that the turbine is pushed to do work, and the compressor is driven to work. The method comprises the steps of adjusting the temperature and pressure of a turbine inlet (which can be adjusted through an air source pressure adjusting valve and fuel oil pressure), adjusting the flow, the rotating speed and the compressor pressure ratio of a compressor (which can be adjusted through a compressor flow adjusting valve and the turbine inlet state), obtaining different working conditions of the compressor, and obtaining corresponding compressor performance parameters after data processing by measuring inlet and outlet thermodynamic parameters, rotating speed and the like of the compressor after adjusting the different working conditions of the compressor, wherein the compressor performance parameters comprise compressor pressure ratio data and compressor flow data of the compressor under different working conditions.
Therefore, the flow characteristic and the efficiency characteristic test of the compressor can be carried out, the compressor pressure ratio data and the compressor flow data of the compressor under different working conditions can be obtained, wherein the compressor pressure ratio can be obtained by measuring the gas pressure after compression and before compression under different working conditions, and the compressor flow is obtained by measuring a lemniscate flowmeter and the like.
S02: and acquiring the rotating speed data of the turbocharger under different working conditions.
In the process of testing the flow characteristic and the efficiency characteristic of the air compressor, the rotating speed data of the turbocharger under different working conditions are obtained, wherein the rotating speed of the turbocharger is obtained by measuring through a rotating speed sensor.
S03: and taking the compressor flow data as required air inflow data of the engine.
Because the air inflow data of the engine is provided by the compressor of the engine, the flow rate of the compressor is the required air inflow of the engine.
S04: and acquiring the rotating speed data of the turbocharger according to the pressure ratio data of the gas compressor under different working conditions, the required air inflow data of the engine and the rotating speed data of the turbocharger.
After compressor pressure ratio data, required air inflow data of an engine and rotating speed data of a turbocharger under different working conditions are obtained, corresponding relations are established among the compressor pressure ratio data, the required air inflow data of the engine and the rotating speed data of the turbocharger under different working conditions, and therefore the rotating speed data of the turbocharger is obtained.
In the embodiment, the flow characteristic and efficiency characteristic test of the air compressor is carried out to obtain the air compressor pressure ratio data and the air compressor flow data of the air compressor under different working conditions, obtain the rotating speed data of the turbocharger under different working conditions, use the air compressor flow data as the required air inflow data of the engine, and finally obtain the rotating speed data of the turbocharger according to the air compressor pressure ratio data, the required air inflow data of the engine and the rotating speed data of the turbocharger under different working conditions, so that the accuracy of the rotating speed data of the turbocharger is improved, the accuracy of the rotating speed of the turbocharger obtained when the vehicle is decelerated and oiled is improved, the rotating speed of the turbocharger is accurately controlled, and the problem of delay of the turbocharger during acceleration is solved.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.
In one embodiment, there is provided a turbocharger control apparatus that corresponds one-to-one to the turbocharger control methods in the above-described embodiments. As shown in fig. 6, the turbocharger control apparatus includes a first determination module 601, a second determination module 602, and an adjustment module 603. The functional modules are explained in detail as follows:
the first determination module 601 is used for determining the required air inflow of the engine when the vehicle decelerates and retracts the accelerator;
a second determination module 602 for determining a speed of the turbocharger based on a demanded intake air amount of the engine;
an adjustment module 603 for adjusting a wastegate of the turbocharger to operate the turbocharger at the rotational speed.
Further, the second determining module 602 is specifically configured to:
determining a compressor pressure ratio of the engine, wherein the compressor pressure ratio is a gas pressure ratio of the compressor after compression to the compressor before compression;
And determining the rotating speed according to the compressor pressure ratio and the required air inflow.
Further, the second determining module 602 is further specifically configured to:
acquiring preset turbocharger rotating speed data, wherein the turbocharger rotating speed data is corresponding relation data of the compressor pressure ratio, the required air inflow of the engine and the rotating speed of the turbocharger;
and inquiring the turbocharger rotating speed data according to the compressor pressure ratio and the required air inflow to determine the rotating speed.
Further, the second determining module 602 is further specifically configured to:
acquiring an intake pressure at the engine air filter;
acquiring the air inlet pressure behind the intercooler of the turbocharger;
and determining the compressor pressure ratio of the engine according to the air inlet pressure at the air filter and the air inlet pressure after the intercooler.
Further, the first determining module 601 is specifically configured to:
determining the air-fuel ratio, power and oil consumption of the engine;
and determining the required air inflow of the engine according to the air-fuel ratio, power and oil consumption of the engine.
For specific limitations of the turbocharger control device, reference may be made to the above limitations of the turbocharger control method, which are not described in detail herein. The respective modules in the turbocharger control apparatus described above may be implemented in whole or in part by software, hardware, and a combination thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
In one embodiment, a turbocharger control device is provided, which may be an ECU. The turbocharger control device comprises a processor and a memory which are connected through a system bus. Wherein the processor of the turbocharger control device is configured to provide calculation and control capabilities. The memory of the turbocharger control device includes a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operating system and the computer program to run on the non-volatile storage medium. The computer program is executed by a processor to implement a turbocharger control method.
In one embodiment, as shown in fig. 7, there is provided a turbocharger control apparatus comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, the processor implementing the following steps when executing the computer program:
when the vehicle decelerates and retracts the accelerator, determining the required air inflow of the engine;
determining the rotation speed of the turbocharger according to the required air inflow of the engine;
adjusting a wastegate of the turbocharger to operate the turbocharger at the rotational speed.
In one embodiment, a readable storage medium is provided, having stored thereon a computer program which, when executed by a processor, performs the steps of:
when the vehicle decelerates and retracts the accelerator, determining the required air inflow of the engine;
determining the rotation speed of the turbocharger according to the required air inflow of the engine;
adjusting a wastegate of the turbocharger to operate the turbocharger at the rotational speed.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in the embodiments provided herein may include non-volatile and/or volatile memory, among others. Non-volatile memory can include read-only memory (ROM), Programmable ROM (PROM), Electrically Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDRSDRAM), Enhanced SDRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), Rambus Direct RAM (RDRAM), direct bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-mentioned functions.
The above-mentioned embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (10)
1. A turbocharger control method, characterized by comprising:
when the vehicle decelerates and retracts the accelerator, determining the required air inflow of the engine;
determining the rotation speed of the turbocharger according to the required air inflow of the engine, wherein the turbocharger comprises a shaft sleeve, a waste valve and a waste valve shaft;
Adjusting an opening of the wastegate of the turbocharger to operate the turbocharger at the rotational speed, a sliding distance between the wastegate shaft and the bushing being reduced in proportion to a reduction in the wastegate opening when the wastegate is adjusted between a fully closed position and a maximum opening position.
2. The turbocharger control method according to claim 1, wherein said determining the rotation speed of the turbocharger based on the required intake air amount of the engine includes:
determining a compressor pressure ratio of the engine, wherein the compressor pressure ratio is a gas pressure ratio of the compressed gas of the compressor to the gas pressure before compression;
and determining the rotating speed according to the compressor pressure ratio and the required air inflow.
3. The turbocharger control method according to claim 2, wherein said determining the rotation speed of the turbocharger based on the compressor pressure ratio and the required intake air amount includes:
acquiring preset turbocharger rotating speed data, wherein the turbocharger rotating speed data is corresponding relation data of the compressor pressure ratio, the required air inflow of the engine and the rotating speed of the turbocharger;
And inquiring the turbocharger rotating speed data according to the compressor pressure ratio and the required air inflow to determine the rotating speed.
4. A turbocharger control method as set forth in claim 3, wherein said turbocharger speed data is obtained by:
performing a flow characteristic and efficiency characteristic test of the compressor to obtain compressor pressure ratio data and compressor flow data of the compressor under different working conditions;
acquiring the rotating speed data of the turbocharger under different working conditions;
taking the compressor flow data as required air inflow data of the engine;
and acquiring the rotating speed data of the turbocharger according to the pressure ratio data of the gas compressor under different working conditions, the required air inflow data of the engine and the rotating speed data of the turbocharger.
5. The turbocharger control method of claim 2, wherein said determining a compressor pressure ratio of the engine comprises:
acquiring an intake pressure at the engine air filter;
acquiring the air inlet pressure behind the intercooler of the turbocharger;
and determining the compressor pressure ratio of the engine according to the air inlet pressure at the air filter and the air inlet pressure after the intercooler.
6. The turbocharger control method according to any one of claims 1 to 5, wherein the determining the required intake air amount of the engine includes:
determining the air-fuel ratio, power and oil consumption of the engine;
and determining the required air inflow of the engine according to the air-fuel ratio, power and oil consumption of the engine.
7. A turbocharger control apparatus, characterized by comprising:
the first determination module is used for determining the required air inflow of the engine when the vehicle decelerates and retracts the accelerator;
a second determination module for determining a speed of the turbocharger based on a demanded intake air amount of the engine, the turbocharger including a shaft sleeve, a wastegate valve, and a wastegate shaft;
an adjustment module to adjust an opening of a wastegate of the turbocharger to operate the turbocharger at the rotational speed, a sliding distance between the wastegate shaft and the shaft sleeve being proportionally reduced by a reduction in the wastegate opening when the wastegate is adjusted between a fully closed position and a maximum opening position.
8. The turbocharger control apparatus according to claim 7, wherein the second determination module is specifically configured to:
Determining a compressor pressure ratio of the engine, wherein the compressor pressure ratio is a gas pressure ratio of the compressor after compression to the compressor before compression;
and determining the rotating speed of the turbocharger according to the compressor pressure ratio and the required air inflow.
9. A turbocharger control apparatus comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor implements the steps of the turbocharger control method according to any one of claims 1 to 6 when executing the computer program.
10. A readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the steps of the turbocharger control method according to any one of claims 1 to 6.
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| JPS58167843A (en) * | 1982-03-30 | 1983-10-04 | Nissan Motor Co Ltd | Compression ratio controller of engine with turbosupercharger |
| JPH0388918A (en) * | 1989-08-31 | 1991-04-15 | Mazda Motor Corp | Control device for engine with turbo-supercharger |
| JP3945349B2 (en) * | 2002-08-30 | 2007-07-18 | 株式会社デンソー | Control device for internal combustion engine |
| US20150159546A1 (en) * | 2012-07-12 | 2015-06-11 | Toyota Jidosha Kabushiki Kaisha | Control device of internal combustion engine equipped with turbo supercharger |
| US10132233B2 (en) * | 2015-10-29 | 2018-11-20 | Superturbo Technologies, Inc. | Compressor map based driven turbocharger control system |
| CN106368804B (en) * | 2016-11-04 | 2019-02-15 | 广州汽车集团股份有限公司 | Engine booster method and system |
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