CN117090700A - Throttle closing rate control method and device, engine control system and automobile - Google Patents
Throttle closing rate control method and device, engine control system and automobile Download PDFInfo
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- CN117090700A CN117090700A CN202311332812.1A CN202311332812A CN117090700A CN 117090700 A CN117090700 A CN 117090700A CN 202311332812 A CN202311332812 A CN 202311332812A CN 117090700 A CN117090700 A CN 117090700A
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- 238000000034 method Methods 0.000 title claims abstract description 46
- 230000008859 change Effects 0.000 claims description 40
- 238000013507 mapping Methods 0.000 claims description 19
- 238000002347 injection Methods 0.000 claims description 14
- 239000007924 injection Substances 0.000 claims description 14
- 239000000446 fuel Substances 0.000 claims description 8
- 238000012937 correction Methods 0.000 claims description 4
- 238000004891 communication Methods 0.000 description 12
- 239000000243 solution Substances 0.000 description 12
- 238000010586 diagram Methods 0.000 description 7
- 230000009471 action Effects 0.000 description 4
- 238000004364 calculation method Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 239000003921 oil Substances 0.000 description 2
- 230000006870 function Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000010705 motor oil Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000036962 time dependent Effects 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0002—Controlling intake air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0002—Controlling intake air
- F02D2041/0022—Controlling intake air for diesel engines by throttle control
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
The application provides a throttle closing rate control method, a device, an engine control system and an automobile, wherein the moving speed of an engine operating point on a compressor map is calculated firstly, the maximum closing rate corresponding to the moving speed is obtained, and then the closing rate of a throttle valve is limited based on the maximum closing rate so as to prevent the closing rate of the throttle valve from being larger than the maximum closing rate, thereby controlling the moving speed of the operating point on the compressor map in turn, and preventing the problem of compressor surge caused by overlarge closing rate of the throttle valve. According to the scheme, the maximum closing rate of the throttle valve allowed under the working condition is determined based on the moving speed of the engine operating point on the compressor map, and the throttle valve closing rate is limited based on the maximum closing rate, so that the reliable operation of the compressor is ensured.
Description
Technical Field
The application relates to the technical field of equipment monitoring, in particular to a throttle closing rate control method and device, an engine control system and an automobile.
Background
In an engine control system, an engine enters a thermal management model to quickly raise exhaust temperature, a throttle valve is closed in a transient state, under many working conditions, the unreasonable closing rate control can cause surge of a compressor (the pressure ratio is increased, the air inflow is reduced) to cause serious faults such as supercharger damage, and the like.
Disclosure of Invention
In view of the above, the embodiment of the application provides a throttle closing rate control method, a throttle closing rate control device, an engine control system and an automobile, so as to realize that an engine is prevented from surging due to too fast throttle closing rate, and the robustness of an engine system is improved.
In order to achieve the above object, the embodiment of the present application provides the following technical solutions:
a throttle closing rate control method comprising:
acquiring the moving speed of an engine operating point on a compressor map;
obtaining a maximum closing rate matched with the moving speed by calculation based on a preset mapping map, wherein the mapping relation between the moving speed and the maximum closing rate is recorded in the preset mapping map, and the maximum closing rate is the maximum allowable closing rate of a throttle valve when a compressor enters a surge state under the current engine working condition;
the closing rate of the throttle valve is limited based on the maximum closing rate.
Optionally, in the above throttle closing rate control method, the obtaining a moving speed of an engine operating point on a compressor map includes:
acquiring the time change rate of the pressure of an air inlet pipe of the engine;
acquiring a time change rate of air flow of an air inlet system of the engine;
and (3) equivalent the change rate of the pressure of the air inlet pipe and the change rate of the air flow to the moving speed of the engine operating point on the compressor map.
Optionally, in the above throttle closing rate control method, the obtaining a moving speed of an engine operating point on a compressor map includes:
acquiring the time change rate of the pressure of an air inlet pipe of the engine;
acquiring a time change rate of air flow of an air inlet system of the engine;
and acquiring the moving speed of the engine operating point on the compressor map, which is matched with the change rate of the air inlet pipe pressure and the change rate of the air flow.
Optionally, in the above method for controlling a closing rate of a throttle valve, limiting the closing rate of the throttle valve based on the maximum closing rate includes:
calculating to obtain the maximum opening of the throttle valve at the next moment based on the maximum closing rate;
acquiring a target opening of a throttle valve;
judging whether the target opening is smaller than the maximum opening;
when the target opening degree of the throttle valve is smaller than the maximum opening degree, inputting the maximum opening degree as the target opening degree of the throttle valve to an engine controller;
when the target opening degree of the throttle valve is not less than the maximum opening degree, the target opening degree is directly input to an engine controller.
Optionally, in the above method for controlling a closing rate of a throttle valve, obtaining a target opening degree of the throttle valve includes:
acquiring the rotation speed and the oil injection quantity of an engine;
calculating a target pressure of an intake pipe pressure of the engine based on the engine speed and an injection amount;
a target opening degree of the throttle valve is calculated based on an actual pressure of an intake pipe pressure of the engine and the target pressure.
Optionally, before the throttle closing rate control method obtains the moving speed of the engine operating point on the compressor map, the method further includes:
judging whether the engine enters a thermal management working condition;
judging whether the opening degree of a throttle valve is smaller than a preset opening degree or not;
and when the engine enters a thermal management working condition and the opening degree of the throttle valve is smaller than the preset opening degree, continuing to execute, otherwise ending the flow.
Optionally, in the throttle closing rate control method, the preset opening degree is 90%.
A throttle closing rate control apparatus comprising:
the acquisition unit is used for acquiring the moving speed of the engine operating point on the compressor map;
the maximum rate threshold calculating unit is used for calculating a maximum closing rate matched with the moving speed based on a preset mapping map, wherein the mapping relation between the moving speed and the maximum closing rate is recorded in the preset mapping map, and the maximum closing rate is the maximum allowable closing rate of a throttle valve when a compressor enters a surge state under the current engine working condition;
and the closing rate correction unit is used for limiting the closing rate of the throttle valve based on the maximum closing rate.
An engine control system comprising:
a memory and a processor;
the memory is used for storing programs;
the processor is configured to execute the program to implement the steps of the throttle closing rate control method according to any one of the above.
An automobile, comprising: the engine control system described above.
Based on the above technical solution, according to the above solution provided by the embodiments of the present application, firstly, the moving speed of the engine operating point on the compressor map is calculated, the maximum closing rate corresponding to the moving speed is obtained, and then, the closing rate of the throttle valve is limited based on the maximum closing rate, so as to prevent the closing rate of the throttle valve from being greater than the maximum closing rate, thereby, conversely, the moving speed of the operating point on the compressor map is controlled, and the problem of compressor surge caused by the overlarge closing rate of the throttle valve is prevented. According to the scheme, the maximum closing rate of the throttle valve allowed under the working condition is determined based on the moving speed of the engine operating point on the compressor map, and the throttle valve closing rate is limited based on the maximum closing rate, so that the reliable operation of the compressor is ensured.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present application, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an engine system in a prior art arrangement;
FIG. 2 is a schematic view of the location of surge lines in a compressor Map;
FIG. 3 is a flow chart diagram of a throttle closing rate control method disclosed in an embodiment of the present application;
FIG. 4 is a flow chart diagram of a throttle closing rate control method according to another embodiment of the present application;
FIG. 5 is a flow chart diagram of a throttle closing rate control method according to another embodiment of the present application;
FIG. 6 is a flow chart diagram of a throttle closing rate control method according to another embodiment of the present application;
FIG. 7 is a schematic view of a throttle closing rate control apparatus according to an embodiment of the present application;
fig. 8 is a schematic structural diagram of an engine control system according to an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
First, the specialized vocabulary used in the present application will be explained with reference to fig. 1:
throttle valve: the throttle valve is a controllable valve for controlling air to enter the engine and is arranged above the air inlet pipeline.
MAF sensor: an air flow sensor (MAF) is mounted between the air cleaner and the intake manifold for measuring the mass of air entering the engine, and a hot wire air flow (MAF) sensor circuit is formed by a sensor, a control module, and wires connecting the two. The sensor outputs a direct voltage signal to a power control module (ECM) having a magnitude proportional to an intake air amount of the engine.
Intake pressure sensor: is installed in the intake manifold for collecting the intake pipe pressure P2.
The Map of the compressor is generally measured by manufacturers, and because of higher measuring cost, only a few working condition points (generally 4-5, which cover the full range of surge to blockage flow as much as possible) at certain rotating speeds are generally selected to measure the pressure ratio and the efficiency. Referring to fig. 2, the Map of the compressor is shown with the abscissa in fig. 2 for the air flow, i.e., the intake air amount of the compressor, and the ordinate for the pressure ratio (the pressure ratio refers to the ratio of the intake pipe pressure P2 to the compressor inlet pressure P1). The turbomachinery of a compressor has a stable operating region in which the left region is a surge region, the surge region and the non-surge region are separated by a surge line (the surge line is a Curve composed of a flow-to-pressure ratio, such as the surge Curve line shown in FIG. 2, in conjunction with which the pressure ratio can be seen through the flow), when the engine operating point is located on the left side of the surge line, the engine cannot operate, the engine is caused to vibrate or the like, thereby damaging the machine, when the engine operating point is located on the right side of the surge line, the engine can operate stably, and when the air flow drops to a very low value or the pressure ratio is too high at a certain air flow, the engine operating point is caused to operate to the surge region, and the operating point may refer to the operating position of the engine on the compressor Map.
According to the method, the air flow flowing through the MAF sensor is calculated to be the MAf flow, the air inlet pipe pressure P2 (equivalent compressor outlet pressure) acquired by the pressure sensor after the pressure in the engine is acquired, the MAf flow and the air inlet pipe pressure P2 acquired at each moment are solved, and the moving direction and speed of the operating point on the compressor map, for example, the direction and speed from 1 point to 2 points in FIG. 2 are solved. When the control is unreasonable, especially when the operating point is too high in moving speed due to the working condition of too high in closing speed of a valve (such as the working condition of too high in closing speed of a throttle valve), the operating point is very easy to exceed a surge area, so that the surge of the compressor is caused, and the occurrence trend of the surge can be estimated through the speed.
The flow surge, also referred to as surge line, is a line consisting of the flow pressure ratio on the surge line as shown in fig. 2 above, and the coordinates of each point on the flow surge can be:
m pr
[kg/s] [-]
0.038 1.359
0.102 1.854
0.142 2.334
0.188 2.853
0.235 3.332
0.283 3.758
0.332 4.196
0.372 4.707
the m represents the Maf flow rate, and pr represents the intake pipe pressure P2.
In the application, the maximum closing rate of the throttle valve is determined in advance based on the moving speed of the operating point on the compressor map, and the actual closing rate of the throttle valve is limited based on the maximum closing rate, so that the phenomenon that the compressor is in surge due to the too high closing speed of the throttle valve can be effectively prevented, and the robustness of the system is improved.
Specifically, referring to fig. 3, the application discloses a throttle closing rate control method, which comprises the following steps:
step S101: and acquiring the moving speed of the engine operating point on the compressor map.
The method can calculate the moving speed of the engine operating point on the compressor map based on the change conditions of the air inlet pipe pressure of the engine and the air flow of the engine air inlet system by collecting the air inlet pipe pressure of the engine and the air flow of the engine air inlet system.
In this solution, the moving speed of the engine operating point on the compressor map may be represented by a rate of change of the intake pipe pressure of the engine and a rate of change of the air flow rate of the engine air intake system, that is, referring to fig. 4, this step may specifically be:
step S1011: the time rate of change of the intake pipe pressure of the engine is acquired.
In this step, when the throttle closing rate control method is executed, the intake pipe pressure P2 of the engine is first acquired, and when the intake pipe pressure P2 of the engine is acquired, the intake pipe pressure P2 of the engine may be continuously acquired based on a preset frequency, which may be set according to design requirements.
Step S1012: a time rate of change of an air flow rate of an engine air intake system is obtained.
In an engine system, the air intake (air flow) and power (corresponding pressure ratio) of the compressor can be managed in such a way that the air intake and the opening of several key valves of the compressor power (such as an intake throttle valve, an exhaust throttle valve, a supercharger bleed valve) are controlled, so that the operating position of the operating point above the compressor map is controlled, and the speed of the valve switches affects the speed at which the operating point moves.
In this step, the MAF sensor based on the intake end of the compressor of the engine measures the air flow rate of the engine system at each moment, which is substantially referred to as the intake air flow rate of the compressor. The same air flow collection frequency can be set according to design requirements.
In a practical scenario, the inlet pressure P1 of the compressor is basically a constant and approximately equal to the atmospheric pressure, the inlet pipe pressure P2 of the engine is changed in real time, the moving speed of the engine operating point in the Y-axis direction on the compressor map can be obtained by deriving the inlet pipe pressure of the engine (DP 2 (the time-dependent value of P2)/Dt (time, that is, DP/Dt), and the moving speed of the engine operating point in the X-axis direction on the compressor map can be obtained by deriving the air flow (Dmaf/Dt, that is, dm/Dt), and by determining the total moving speed of the engine operating point on the compressor map by the two moving speeds, the scheme ensures that the compressor does not run out of the surge region by limiting the operating speed, so that the moving speed of the engine operating point on the compressor map can be equivalent to the moving speed of the engine operating point on the compressor map.
Step S102: and obtaining and calculating based on a preset map to obtain the maximum closing rate matched with the moving speed.
And the preset map is recorded with a mapping relation between the moving speed of the engine operating point on the compressor map and the maximum closing speed, and the maximum closing speed is the maximum allowable closing speed of the throttle valve when the compressor enters a surge state under the current engine working condition. In this scheme, the maximum closing rate may be equal to the maximum allowable closing rate of the throttle valve when the compressor enters a surge condition under the current operating condition. If the closing rate of the throttle valve is greater than the maximum allowable closing rate, the compressor will enter a surge condition. In this scheme, the maximum closing rate may be a pre-calibrated value, the moving speed of the operating point is different, the corresponding maximum closing rate is different, and the moving speed of the engine operating point on the compressor map and the maximum closing rate are in an inverse relation, that is, the greater the moving speed of the engine operating point on the compressor map, the smaller the corresponding maximum closing rate, the smaller the moving speed of the engine operating point on the compressor map, and the corresponding maximum closing rate.
As is apparent from the foregoing description, the moving speed of the engine operating point on the compressor map can be calculated based on the change rate of the target pressure and the change rate of the air flow, and thus, in the present application, a map between the moving speed of the engine operating point on the compressor map and the change rate of the target pressure and the change rate of the air flow can be established in advance, and after the change rate of the target pressure and the change rate of the air flow are calculated, the moving speed of the engine operating point on the compressor map can be calculated based on the map. Of course, in the present application, the moving speed of the engine operating point on the compressor map may be directly represented by the target pressure change rate and the air flow change rate without establishing a mapping relationship between the moving speed and the target pressure change rate and the air flow change rate.
When the rate of change of the target pressure and the rate of change of the air flow are directly used to characterize the moving speed of the engine operating point on the compressor map, referring to fig. 4, the steps specifically include:
step S1021: and calculating a maximum closing rate matched with the change rate of the target pressure and the change rate of the air flow based on a preset map.
At this time, the preset map sequentially records the change rates of different target pressures and the corresponding maximum closing rates at the change rates of the air flow rates.
Specifically, the step may calculate the change rate of the target pressure and the change rate of the air flow in a manner of deriving the target pressure and the air flow, so that the step may calculate a maximum closing rate for the preset map, which is matched with the derived target pressure and the derived change rate of the air flow.
Step S103: the closing rate of the throttle valve is limited based on the maximum closing rate.
In the step, after the maximum closing rate corresponding to the moving speed of the current engine operating point on the compressor map is calculated, the closing rate of the throttle valve is limited based on the maximum closing rate, so that the closing rate of the throttle valve is not greater than the maximum closing rate, and the compressor cannot enter a surge state due to the too fast closing rate of the throttle valve.
As can be seen from the technical solutions disclosed in the foregoing embodiments of the present application, in the present application, firstly, the moving speed of the engine operating point on the compressor map is calculated, the maximum closing rate corresponding to the moving speed is obtained, and then, the closing rate of the throttle valve is limited based on the maximum closing rate, so as to prevent the closing rate of the throttle valve from being greater than the maximum closing rate, thereby, conversely, controlling the moving speed of the operating point on the compressor map, and preventing the compressor surge problem caused by the excessive closing rate of the throttle valve. According to the scheme, the maximum closing rate of the throttle valve allowed under the working condition is determined based on the moving speed of the engine operating point on the compressor map, and the throttle valve closing rate is limited based on the maximum closing rate, so that the reliable operation of the compressor is ensured, and the robustness of the system is further improved.
Further, in the technical solution disclosed in the embodiment of the present application, when the closing rate of the throttle valve is limited based on the maximum closing rate, the closing rate may be limited by limiting the target opening of the throttle valve, and the association form between the two may be: the larger the value of the target opening degree is, the smaller the closing rate value is, specifically, referring to fig. 5, the limiting the closing rate of the throttle valve based on the maximum closing rate may specifically include:
step S1031: and calculating the maximum opening of the throttle valve at the next moment based on the maximum closing rate.
After the maximum closing rate is determined, calculating to obtain the maximum opening of the throttle valve at the next moment based on the maximum closing rate and the unit time length, for example, the maximum closing rate is A, the unit time length is B, the current opening of the throttle valve is C, and the calculation result of C-A is the maximum opening of the throttle valve at the next moment.
Step S1032: a target opening degree of a throttle valve is obtained.
The target opening degree of the throttle valve is one of engine control parameters, and can be directly obtained by an engine control system, in the scheme, the target opening degree of the throttle valve can also be calculated based on the engine speed and the fuel injection quantity, and when the target opening degree is calculated based on the engine speed and the fuel injection quantity, referring to fig. 6, the process specifically can include:
step S10321: and obtaining the engine rotating speed and the fuel injection quantity.
The engine speed is the speed of the engine at the current moment, and the engine oil injection quantity is the oil injection quantity of the engine at the current moment. The engine speed and the fuel injection quantity of the engine can be directly extracted from an engine control system.
Step S10322: a target pressure of an intake pipe pressure of the engine is calculated based on the engine speed and the injection amount.
After the engine speed and the fuel injection quantity are determined, the target pressure of the air inlet pipe pressure of the engine can be directly determined or calculated based on the mapping relation between the engine speed, the fuel injection quantity and the air inlet pipe pressure or a calculation formula, and the engine speed is different, the fuel injection quantity is different, and the corresponding target pressure of the air inlet pipe of the engine is different.
Step S10323: a target opening degree of the throttle valve is calculated based on an actual pressure of an intake pipe pressure of the engine and the target pressure.
In this step, the actual pressure of the intake pipe pressure of the engine and the target pressure are input to a PID controller, and the PID controller is used to perform PID operation on the actual pressure and the target pressure, so that the target opening of the throttle valve can be calculated.
Step S1033: and judging whether the target opening is smaller than the maximum opening.
And after determining the target opening of the throttle valve, comparing the target opening with the maximum opening, and determining the final target opening of the throttle valve based on a comparison result.
In this scheme, when the target opening is smaller than the maximum opening, it indicates that the closing rate of the throttle valve is too high at this time, which may cause the compressor to enter a surge state, and when the target opening is not smaller than the maximum opening, it indicates that the closing rate of the throttle valve at this time does not cause the compressor to enter a surge state, without intervening in the closing rate of the throttle valve.
Step S1034: when the target opening degree of the throttle valve is smaller than the maximum opening degree, the maximum opening degree is input to an engine controller as the target opening degree of the throttle valve.
Step S1035: when the target opening degree of the throttle valve is not less than the maximum opening degree, the target opening degree is directly input to an engine controller.
In this aspect, when the target opening degree of the throttle valve is smaller than the maximum opening degree, the maximum opening degree is input to an engine controller as the target opening degree of the throttle valve, and the engine controller controls the closing rate of the throttle valve based on the final target opening degree with the maximum opening degree as the final target opening degree of the throttle valve, and at this time, the closing rate of the throttle valve corresponds to the maximum closing rate. When the target opening degree is directly input to an engine controller, the controller controls the closing rate of the throttle valve directly based on the target opening degree.
In the technical solution disclosed in this embodiment, the triggering of the throttle closing rate control method has a certain precondition, that is, before the moving speed of the engine operating point on the compressor map is obtained, the method further includes: acquiring an engine operation condition, and judging whether the engine enters a thermal management condition or not based on the engine operation condition; acquiring the throttle opening, and judging whether the throttle opening is smaller than a preset opening or not; and when the engine enters a thermal management working condition and the opening degree of the throttle valve is smaller than the preset opening degree, continuing to execute the action step S101, otherwise ending the flow. The value of the preset opening can be set according to the user requirement, and in the technical scheme disclosed in the embodiment, the preset opening can be set to 90%.
In this embodiment, a throttle closing rate control device is disclosed, and specific working contents of each unit in the device are referred to the contents of the above method embodiment.
The throttle closing rate control apparatus provided by the embodiment of the application will be described below, and the throttle closing rate control apparatus described below and the throttle closing rate control method described above may be referred to correspondingly to each other.
Specifically, referring to fig. 7, the throttle closing rate control apparatus may include:
the acquisition unit 10 is used for acquiring the moving speed of the engine operating point on the compressor map;
the maximum rate threshold calculating unit 20 is configured to calculate a maximum closing rate that matches the moving speed based on a preset map, where a mapping relationship between the moving speed and the maximum closing rate is recorded in the preset map, and the maximum closing rate is a maximum allowable closing rate of the throttle valve when the compressor enters a surge state under a current engine working condition;
and a closing rate correction unit 30 for limiting the closing rate of the throttle valve based on the maximum closing rate.
As can be seen from the technical solutions disclosed in the foregoing embodiments of the present application, in this solution, the collecting unit 10 first calculates the moving speed of the engine operating point on the compressor map, then uses the maximum speed threshold calculating unit 20 to obtain the maximum closing speed corresponding to the moving speed, and finally the closing speed correcting unit 30 limits the closing speed of the throttle valve based on the maximum closing speed, so as to prevent the closing speed of the throttle valve from being greater than the maximum closing speed, thereby controlling the moving speed of the operating point on the compressor map in turn, and preventing the compressor surge problem caused by the excessive closing speed of the throttle valve. According to the scheme, the maximum closing rate of the throttle valve allowed under the working condition is determined based on the moving speed of the engine operating point on the compressor map, and the throttle valve closing rate is limited based on the maximum closing rate, so that the reliable operation of the compressor is ensured, and the robustness of the system is further improved.
The acquisition unit 10, the maximum rate threshold calculation unit 20 and the closing rate correction unit 30 are further configured to implement other steps disclosed in the embodiments of the throttle closing rate control method described above, and are not particularly tired.
Fig. 8 is a hardware configuration diagram of an engine control system according to an embodiment of the present application, as shown in fig. 8, may include: at least one processor 100, at least one communication interface 200, at least one memory 300, and at least one communication bus 400;
in the embodiment of the present application, the number of the processor 100, the communication interface 200, the memory 300 and the communication bus 400 is at least one, and the processor 100, the communication interface 200 and the memory 300 complete the communication with each other through the communication bus 400; it will be apparent that the communication connection schematic shown in the processor 100, the communication interface 200, the memory 300 and the communication bus 400 shown in fig. 8 is only optional;
alternatively, the communication interface 200 may be an interface of a communication module, such as an interface of a GSM module;
the processor 100 may be a central processing unit CPU, or a specific integrated circuit ASIC (Application Specific Integrated Circuit), or one or more integrated circuits configured to implement embodiments of the present application.
Memory 300 may comprise high-speed RAM memory or may further comprise non-volatile memory (non-volatile memory), such as at least one disk memory.
The processor 100 is specifically configured to:
acquiring the moving speed of an engine operating point on a compressor map;
calculating a maximum closing rate matched with the moving speed based on a preset mapping map, wherein the mapping relation between the moving speed and the maximum closing rate is recorded in the preset mapping map, and the maximum closing rate is the maximum allowable closing rate of a throttle valve when a compressor enters a surge state under the current engine working condition;
the closing rate of the throttle valve is limited based on the maximum closing rate.
The processor is further configured to implement the steps of other embodiments of the throttle closing rate control method described above, and is not specifically described in detail.
In addition, the application also discloses an automobile, and the automobile can be applied to the engine control system of any one of the embodiments.
For convenience of description, the above system is described as being functionally divided into various modules, respectively. Of course, the functions of each module may be implemented in the same piece or pieces of software and/or hardware when implementing the present application.
In this specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments. In particular, for a system or system embodiment, since it is substantially similar to a method embodiment, the description is relatively simple, with reference to the description of the method embodiment being made in part. The systems and system embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present application without undue burden.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative elements and steps are described above generally in terms of functionality in order to clearly illustrate the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. The software modules may be disposed in Random Access Memory (RAM), memory, read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
It is further noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A throttle closing rate control method, characterized by comprising:
acquiring the moving speed of an engine operating point on a compressor map;
calculating a maximum closing rate matched with the moving speed based on a preset mapping map, wherein the mapping relation between the moving speed and the maximum closing rate is recorded in the preset mapping map, and the maximum closing rate is the maximum allowable closing rate of a throttle valve when a compressor enters a surge state under the current engine working condition;
the closing rate of the throttle valve is limited based on the maximum closing rate.
2. The throttle closing rate control method according to claim 1, characterized by obtaining a moving speed of an engine operating point on a compressor map, comprising:
acquiring the time change rate of the pressure of an air inlet pipe of the engine;
acquiring a time change rate of air flow of an air inlet system of the engine; and (3) equivalent the change rate of the pressure of the air inlet pipe and the change rate of the air flow to the moving speed of the engine operating point on the compressor map.
3. The throttle closing rate control method according to claim 1, characterized by obtaining a moving speed of an engine operating point on a compressor map, comprising:
acquiring the time change rate of the pressure of an air inlet pipe of the engine;
acquiring a time change rate of air flow of an air inlet system of the engine;
and acquiring the moving speed of the engine operating point on the compressor map, which is matched with the change rate of the air inlet pipe pressure and the change rate of the air flow.
4. The throttle closing rate control method according to claim 1, characterized in that limiting the closing rate of the throttle valve based on the maximum closing rate includes:
calculating to obtain the maximum opening of the throttle valve at the next moment based on the maximum closing rate;
acquiring a target opening of a throttle valve;
judging whether the target opening is smaller than the maximum opening;
when the target opening degree of the throttle valve is smaller than the maximum opening degree, inputting the maximum opening degree as the target opening degree of the throttle valve to an engine controller;
when the target opening degree of the throttle valve is not less than the maximum opening degree, the target opening degree is directly input to an engine controller.
5. The throttle closing rate control method according to claim 4, characterized in that obtaining a target opening degree of the throttle valve includes:
acquiring the rotation speed and the oil injection quantity of an engine;
calculating a target pressure of an intake pipe pressure of the engine based on the engine speed and the fuel injection amount;
a target opening degree of the throttle valve is calculated based on an actual pressure of an intake pipe pressure of the engine and the target pressure.
6. The throttle closing rate control method according to claim 1, characterized by further comprising, before acquiring the moving speed of the engine operating point on the compressor map:
judging whether the engine enters a thermal management working condition;
judging whether the opening degree of a throttle valve is smaller than a preset opening degree or not;
and when the engine enters a thermal management working condition and the opening degree of the throttle valve is smaller than the preset opening degree, continuing to execute, otherwise ending the flow.
7. The throttle closing rate control method according to claim 6, characterized in that the preset opening degree is 90%.
8. A throttle closing rate control apparatus, characterized by comprising:
the acquisition unit is used for acquiring the moving speed of the engine operating point on the compressor map;
the maximum rate threshold calculating unit is used for calculating a maximum closing rate matched with the moving speed based on a preset mapping map, wherein the mapping relation between the moving speed and the maximum closing rate is recorded in the preset mapping map, and the maximum closing rate is the maximum allowable closing rate of a throttle valve when a compressor enters a surge state under the current engine working condition;
and the closing rate correction unit is used for limiting the closing rate of the throttle valve based on the maximum closing rate.
9. An engine control system, comprising:
a memory and a processor;
the memory is used for storing programs;
the processor is configured to execute the program to implement the respective steps of the throttle closing rate control method according to any one of claims 1 to 7.
10. An automobile, comprising: the engine control system of claim 9.
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| CN202311332812.1A CN117090700B (en) | 2023-10-16 | 2023-10-16 | Throttle closing rate control method and device, engine control system and automobile |
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| CN202311332812.1A CN117090700B (en) | 2023-10-16 | 2023-10-16 | Throttle closing rate control method and device, engine control system and automobile |
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| CN117090700B (en) | 2024-01-16 |
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