CN114233502B - Control method and device for fuel gas proportional valve of natural gas engine - Google Patents
Control method and device for fuel gas proportional valve of natural gas engine Download PDFInfo
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- CN114233502B CN114233502B CN202111593479.0A CN202111593479A CN114233502B CN 114233502 B CN114233502 B CN 114233502B CN 202111593479 A CN202111593479 A CN 202111593479A CN 114233502 B CN114233502 B CN 114233502B
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- 239000002737 fuel gas Substances 0.000 title claims abstract description 136
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 72
- 238000000034 method Methods 0.000 title claims abstract description 38
- 239000003345 natural gas Substances 0.000 title claims abstract description 36
- 239000007789 gas Substances 0.000 claims abstract description 92
- 238000012937 correction Methods 0.000 claims description 28
- 238000011217 control strategy Methods 0.000 abstract description 10
- 230000001186 cumulative effect Effects 0.000 description 5
- 238000005259 measurement Methods 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000001514 detection method Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
- F02D41/2406—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using essentially read only memories
- F02D41/2425—Particular ways of programming the data
- F02D41/2429—Methods of calibrating or learning
- F02D41/2432—Methods of calibration
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/0027—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures the fuel being gaseous
-
- 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
- F02D41/22—Safety or indicating devices for abnormal conditions
- F02D41/221—Safety or indicating devices for abnormal conditions relating to the failure of actuators or electrically driven elements
-
- 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
- F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
- F02D41/2406—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using essentially read only memories
- F02D41/2425—Particular ways of programming the data
- F02D41/2429—Methods of calibrating or learning
- F02D41/2441—Methods of calibrating or learning characterised by the learning conditions
- F02D41/2445—Methods of calibrating or learning characterised by the learning conditions characterised by a plurality of learning conditions or ranges
-
- 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
- F02D41/22—Safety or indicating devices for abnormal conditions
- F02D2041/224—Diagnosis of the fuel system
-
- 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
- Y02T10/40—Engine management systems
Landscapes
- 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)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The application provides a control method and a device for a fuel gas proportional valve of a natural gas engine, wherein the method comprises the following steps: judging whether the gas proportional valve currently meets the zero position self-learning condition; if yes, determining the current valve closing accumulated times of the detected fuel gas proportional valve; judging whether the current valve closing accumulated times are larger than a preset valve closing threshold value or not; if the current valve closing accumulated times are larger than a preset valve closing threshold, correcting the fuel gas proportional valve when detecting that the current actual closing position of the fuel gas proportional valve is in the zero position threshold range; therefore, under the condition of zero point offset, the opening degree of the fuel gas proportional valve can be corrected, so that the fuel gas proportional valve can still provide proper and correct fuel gas supply flow, the fuel gas leakage and the pipeline blockage are prevented, the problem of false alarm due to faults is reduced, and the control strategy is more comprehensive and accurate compared with the existing control strategy.
Description
Technical Field
The application belongs to the technical field of control of fuel gas proportional valves, and particularly relates to a method and a device for controlling a fuel gas proportional valve of a natural gas engine.
Background
The existing fuel gas proportional valve of the natural gas engine cannot reasonably control the opening and closing positions of fuel gas, and the problems of inaccurate fuel gas supply flow control, inaccurate sealing of the closing position of the fuel gas proportional valve and the like are easily caused.
Under the condition of complex application environment, the pipeline pressure required by the gas injection valve is too high, so that pipeline leakage is easy to occur, the gas nozzle is easy to be blocked by impurities, and the failure rate of the gas injection valve and the pipeline thereof in the market is high; and, the existing electric control logic can not carry out quick and effective monitoring control on the opening and closing of the fuel gas proportional valve.
Disclosure of Invention
In view of the above, the present application aims to provide a method and a device for controlling a gas proportional valve of a natural gas engine, which are used for correcting the opening of the gas proportional valve under the condition that the gas proportional valve is offset at zero, so that the gas proportional valve can still provide proper and correct gas supply flow, prevent gas leakage and pipeline blockage, and reduce the problem of false failure.
The application discloses a control method of a fuel gas proportional valve of a natural gas engine, which comprises the following steps:
judging whether the gas proportional valve currently meets a zero position self-learning condition or not;
if yes, determining the current closing frequency of the gas proportional valve;
judging whether the current valve closing accumulated times are larger than a preset valve closing threshold value or not;
and if the current valve closing accumulated times are larger than the preset valve closing threshold, correcting the gas proportional valve when the current actual closing position of the gas proportional valve is detected to be in the zero position threshold range.
Optionally, in the above control method for a gas proportional valve of a natural gas engine, the correcting the gas proportional valve includes:
judging y n -z n Whether greater than a zero offset threshold;
if yes, then determine z n ＝z n-1 +D; if not, then determine z n ＝y n ；
Determining w n ＝x n- z n ；
Wherein D is a zero offset threshold; y is n Is the second parameter when the valve is closed for the nth time; z n The zero self-learning value is obtained when the valve is closed for the nth time; z n-1 The zero self-learning value is the zero self-learning value when the valve is closed for the n-1 th time; w (w) n Valve zero point repair for nth valve closingPositive values.
Optionally, in the method for controlling a gas proportional valve of a natural gas engine, the second parameter is a current actual closing position of the gas proportional valve.
Optionally, in the above natural gas engine fuel gas proportional valve control method, after determining whether the current valve closing cumulative number is greater than a preset valve closing threshold, if the current valve closing cumulative number is greater than the preset valve closing threshold, further includes:
and when the current actual closing position of the fuel gas proportional valve is detected to be out of the zero position threshold range, judging that the fuel gas proportional valve has zero offset faults.
Optionally, in the above natural gas engine fuel gas proportional valve control method, after determining whether the current valve closing cumulative number is greater than a preset valve closing threshold, if determining whether the current valve closing cumulative number is greater than the preset valve closing threshold, further includes:
and determining that the second parameter is 0 and the zero point correction value is the current actual closing position.
Optionally, in the above control method for a gas proportional valve of a natural gas engine, determining whether the gas proportional valve currently meets a zero position self-learning condition includes:
when the engine enters a reverse-dragging working condition, judging whether the inlet-outlet pressure difference of the fuel gas proportional valve is smaller than a preset pressure drop threshold value, wherein the set opening degree of the fuel gas proportional valve is smaller than a zero point set threshold value, and the current actual closing position is in a zero point position threshold value range.
The application discloses a control device of a fuel gas proportional valve of a natural gas engine, which comprises the following components:
the first judging unit is used for judging whether the fuel gas proportional valve currently meets the zero position self-learning condition;
the accumulated valve closing frequency unit is used for determining that the current valve closing accumulated frequency of the fuel gas proportional valve is detected if the judgment result of the first judgment unit is yes;
the second judging unit is used for judging whether the current valve closing accumulated times are larger than a preset valve closing threshold value or not;
and the correction unit is used for correcting the fuel gas proportional valve when the current actual closing position of the fuel gas proportional valve is detected to be in the zero position threshold range if the judgment result of the second judgment unit is yes.
Optionally, in the above natural gas engine fuel gas proportional valve control device, the correction unit is configured to, when correcting the fuel gas proportional valve, specifically:
judging y n -z n Whether greater than a zero offset threshold;
if yes, then determine z n ＝z n-1 +D; if not, then determine z n ＝y n ；
Determining w n ＝x n- z n ；
Wherein D is a zero offset threshold; y is n Is the second parameter when the valve is closed for the nth time; z n The zero self-learning value is obtained when the valve is closed for the nth time; z n-1 The zero self-learning value is the zero self-learning value when the valve is closed for the n-1 th time; w (w) n The valve zero point correction value at the nth valve closing time.
Optionally, in the above natural gas engine fuel gas proportional valve control device, the method further includes:
and the fault unit is used for judging that the gas proportional valve has zero offset fault when the current actual closing position of the gas proportional valve is detected to be out of the zero position threshold range if the judgment result of the second judgment unit is yes.
Optionally, in the above natural gas engine gas proportional valve control device, the first judging unit is configured to judge whether the gas proportional valve currently meets a zero position self-learning condition, and specifically is configured to:
when the engine enters a reverse-dragging working condition, judging whether the inlet-outlet pressure difference of the fuel gas proportional valve is smaller than a preset pressure drop threshold value, wherein the set opening degree of the fuel gas proportional valve is smaller than a zero point set threshold value, and the current actual closing position is in a zero point position threshold value range.
According to the technical scheme, the control method of the natural gas engine fuel gas proportional valve provided by the application comprises the following steps: judging whether the gas proportional valve currently meets the zero position self-learning condition; if yes, determining the current valve closing accumulated times of the detected fuel gas proportional valve; judging whether the current valve closing accumulated times are larger than a preset valve closing threshold value or not; if the current valve closing accumulated times are larger than a preset valve closing threshold, correcting the fuel gas proportional valve when detecting that the current actual closing position of the fuel gas proportional valve is in the zero position threshold range; therefore, under the condition of zero point offset, the opening degree of the fuel gas proportional valve can be corrected, so that the fuel gas proportional valve can still provide proper and correct fuel gas supply flow, the fuel gas leakage and the pipeline blockage are prevented, the problem of false alarm due to faults is reduced, and the control strategy is more comprehensive and accurate compared with the existing control strategy.
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 in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a natural gas engine fuel gas ratio provided by an embodiment of the present application;
FIG. 2 is a flow chart of a control method of a fuel gas proportional valve of a natural gas engine provided by an embodiment of the application;
FIG. 3 is a flow chart of another method for controlling a fuel gas proportional valve of a natural gas engine according to an embodiment of the present application;
fig. 4 is a flowchart of another control method for a fuel gas proportional valve of a natural gas engine according to an embodiment of the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. 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.
In the present disclosure, 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 embodiment provides a control method for a fuel gas proportional valve of a natural gas engine, which is used for solving the problem that in the prior art, an electric control logic cannot rapidly and effectively monitor and control the opening and closing of fuel gas of the fuel gas proportional valve.
As shown in fig. 1, a schematic structural diagram of a natural gas engine fuel gas proportioning valve is shown. Wherein: 1 is a natural gas cylinder; 2 is a gas pipeline inlet pressure temperature sensor; 3 is an electromagnetic cut-off valve; 4 is a combination of a position sensor and a pressure sensor; 5 is a proportional valve; 6 is a gas pipeline gas outlet pressure temperature sensor; 7 is a fuel gas proportional valve; 8 is an engine; and 9 is an electric control unit.
It should be noted that the schematic structural diagram shown in fig. 1 does not represent an actual layout: fig. 1 is a schematic diagram of a gas proportional valve, which is not drawn according to the drawing scale or actual arrangement, but simply compares the gas inlet and the gas outlet of the gas proportional valve, and performs measurement and feedback by distributing several sensors. The electromagnetic cut-off valve 3 is only a switch, and can only be opened or closed, and the closing position (zero point) is a proportional valve 5, and the proportional valve 5 can be opened or closed according to a certain percentage.
The natural gas engine fuel gas proportional valve consists of an electromagnetic cut-off valve 3, a combination piece 4 of a proportional valve position sensor and a pressure sensor, proportional valves 5,2 and 6 fuel gas inlet and outlet temperature pressure sensors and the like. The fuel gas enters the proportional valve 5 through the electromagnetic cut-off valve 3, the proportional valve 5 calculates the fuel gas demand according to the sensor monitoring data of the sensors 2, 4 and 6 and the software logic, the fuel gas demand is converted into the set opening of the proportional valve 5, and the valve is opened to a correct opening according to the set opening command, so that a reasonable and proper amount of fuel gas is ensured to enter the engine for ignition.
In the embodiment, whether the gas proportional valve currently meets the zero position self-learning condition is judged; if yes, determining the current valve closing accumulated times of the detected fuel gas proportional valve; judging whether the current valve closing accumulated times are larger than a preset valve closing threshold value or not; if the current valve closing accumulated times are larger than a preset valve closing threshold, correcting the fuel gas proportional valve when detecting that the current actual closing position of the fuel gas proportional valve is in the zero position threshold range; therefore, under the condition of zero point offset, the opening degree of the fuel gas proportional valve can be corrected, so that the fuel gas proportional valve can still provide proper and correct fuel gas supply flow, the fuel gas leakage and the pipeline blockage are prevented, the problem of false alarm due to faults is reduced, and the control strategy is more comprehensive and accurate compared with the existing control strategy.
Referring to fig. 2, the control method of the fuel gas proportional valve of the natural gas engine comprises the following steps:
s101, judging whether the gas proportional valve currently meets the zero position self-learning condition.
That is, the zero-position self-learning condition may be preset so as to execute the corresponding zero-position self-learning strategy when the zero-position self-learning is mainly performed.
Specifically, the zero position self-learning strategy may include the following steps S102-S104. And will not be described in detail herein, see the following description.
If the fuel gas proportional valve currently satisfies the zero position self-learning condition, step S102 is executed.
S102, determining the current valve closing accumulated times of the detected fuel gas proportional valve.
It should be noted that n is taken as the current accumulated valve closing times; its initial value is 0; every time the gas proportional valve is closed, n=n+1; that is, n is accumulated by 1. Thus, the current valve closing accumulated times can be determined by acquiring the value of the current n.
S103, judging whether the current valve closing accumulated times are larger than a preset valve closing threshold value or not.
If the current valve closing cumulative number is greater than the preset valve closing threshold, step S104 is executed.
And S104, when the current actual closing position of the fuel gas proportional valve is detected to be in the zero position threshold range, correcting the fuel gas proportional valve.
That is, an electric control strategy is provided for the gas proportional valve closing position, namely, the zero position; the electronic control strategy can ensure that when the fuel gas proportional valve is closed, the zero position is accurate, even if the zero point of the closing position is slightly deviated, the deviation of the closing position can be corrected through the electronic control logic, and the opening degree of the fuel gas proportional valve is consistent with the opening degree required by the issued instruction, if 50% of the opening degree is 50% of the opening degree, the closing degree is 0%, and the full opening degree is 100%.
The purpose is mainly to improve the precision from opening to closing and from closing to opening of the fuel gas proportional valve. The actual opening degree is not measured by the computer board according to the sensor, if the sensor does not correct, the proportional valve 5 is opened by 50%, and the engine computer board, namely the electronic control unit, considers that the proportional valve is opened by 50%, and the actual sensor is deviated by 5%. In practice, the proportional valve 5 is opened only 45%, which affects the actual gas supply of the gas, and the gas supply becomes smaller, affecting the operation of the engine.
In this embodiment, only if the closed position of the gas proportional valve is within a reasonable range, it can be ensured that the structure of the gas proportional valve itself has no hardware failure, and correct gas quantity can be provided, and gas leakage is prevented.
In practical application, judging whether the gas proportional valve currently meets the zero position self-learning condition comprises the following steps:
when the engine enters a reverse-dragging working condition, judging whether the pressure difference between an inlet and an outlet of the fuel gas proportional valve is smaller than a preset pressure drop threshold value, wherein the set opening degree of the fuel gas proportional valve is smaller than a zero point set threshold value, and the current actual closing position is in a zero point position threshold value range.
The above determination may be divided into three determinations, which are respectively: first judgment: judging whether the inlet-outlet pressure difference of the fuel gas proportional valve is smaller than a preset pressure drop threshold value or not; and (3) second judgment: judging whether the set opening degree of the fuel gas proportional valve is smaller than a zero point set threshold value or not; third judgment: and judging whether the current actual closing position is within a zero position threshold range or not.
The order of the three determinations may be arbitrary, and is not specifically limited herein, and may be determined according to practical situations, which are all within the scope of the present application.
As shown in fig. 4, one of the sequences is shown, and the other sequences are not described in detail herein, and are all within the scope of the present application.
That is, the gas proportional valve zero-entry position self-learning requires that the following conditions be satisfied:
(1) and the engine enters a reverse towing working condition to cut off the gas supply.
Wherein, the gas cuts off in the condition of backward dragging: the condition that the engine only has no throttle at the rotating speed is a reverse towing condition, also called a fuel cut-off condition, and the engine does not spray fuel gas at the moment, so that the fuel gas proportional valve is naturally cut off and returns to a closing position, namely a zero position.
(2) The inlet and outlet gas pressure difference DeltaPn of the gas proportional valve is smaller than the set pressure drop threshold value Pn.
A gas proportional valve that can be fully opened from off to 100%; based on the mechanical structure of the fuel gas proportional valve, the fuel gas pressure of the fuel gas inlet and the fuel gas outlet has a certain pressure difference, which is called pressure drop; when the fuel gas proportional valve is closed, that is, the electromagnetic cut-off valve 3 is closed (the electromagnetic cut-off valve 3 is only opened and closed), the proportional valve 5 is also closed and returns to the zero position, only a little fuel gas remains in the fuel gas proportional valve, the inlet pressure is measured through the combination 4 of the proportional valve sensor and the pressure sensor, the outlet pressure is measured through the fuel gas inlet and outlet temperature pressure sensor 6, the difference value of the inlet and outlet pressure is a value which is approximately zero, so that a smaller threshold value of the fuel gas pressure drop is set, and when the inlet and outlet pressure difference is smaller than the threshold value of the fuel gas pressure drop, the fuel gas proportional valve is considered to be completely closed and returns to the zero point, and the self-learning control logic of the zero point position can be entered at the moment. When the inlet-outlet pressure difference is larger than the threshold value of the fuel gas pressure drop, the proportional valve 5 is considered to be not completely closed, and fuel gas flows in the middle, so that the next step cannot be performed.
(3) When the electronic control unit sends a gas proportional valve closing command, after the set time is delayed, the set opening value un of the gas proportional valve is smaller than the set zero point set threshold value C, and the gas proportional valve is confirmed to receive the closing command and is closed.
The proportional valve 5 is operated by giving a set command to close, and setting the opening to 0 at this time, and when the proportional valve 5 is fully closed, it is considered that the closing is 0%, and in practice, there may be a small difference of several percent, even a fraction of a percent; therefore, a set zero point threshold C is defined, which is the maximum threshold that can be tolerated, and when the setting command of the proportional valve 5 is smaller than the zero point threshold C, it means that the closing operation of the proportional valve 5 is started; it should be noted that the command is sent here, not executed, and executed in the next step. When the setting command of the proportional valve 5 is greater than the zero point threshold value C, the closing command of the proportional valve 5 has not yet been started to be transmitted.
(4) When the gas proportional valve receives a closing command, delaying the setting time, and detecting the actual opening value x of the gas proportional valve by the position sensor n And (3) being smaller than the zero position threshold value A set by the fuel gas proportional valve, and confirming that the fuel gas proportional valve is closed.
Zero point threshold a: the proportional valve 5 receives the closing command of the previous step, starts to execute the command, and the proportional valve 5 starts to close, and then the combination 4 of the position sensor and the pressure sensor can detect whether the proportional valve 5 is completely closed. In fact, there is also an error in the sensor, so that after the combination 4 of the position sensor and the pressure sensor detects that the gas proportional valve is closed, there is a small difference of about a few percent, even a fraction of a percent, but the actual proportional valve 5 is already completely closed, so that given a zero point threshold a, when the measured position of the combination 4 of the position sensor and the pressure sensor is smaller than the given zero point threshold a, the proportional valve 5 is considered to be truly closed, whereas the proportional valve 5 is considered to be not yet closed. The proportional valve 5 is not closed, and the operation may not be completed, or the proportional valve 5 itself is damaged and cannot be closed, and the next operation may not be performed.
It is to be noted that, through the above-described (1) (2) (3) (4), the gas proportional valve is considered to have been completely closed, and it is ensured that the gas proportional valve has been closed. So that the correction is started for the difference of a fraction of a percent generated in the above description.
In practical application, as shown in fig. 3, the correction of the fuel gas proportional valve in step S104 includes:
s201, judging y n -z n Whether greater than a zero offset threshold.
If yes, step S202 is executed.
S202, determining z n ＝z n-1 +D。
If not, step S203 is performed.
S203, determining z n ＝y n 。
Step S204 is performed after both steps S202 and S203.
S204, determining w n ＝x n- z n 。
Wherein D is a zero offset threshold; y is n Is the second parameter when the valve is closed for the nth time; z n The zero self-learning value is obtained when the valve is closed for the nth time; z n-1 The zero self-learning value is the zero self-learning value when the valve is closed for the n-1 th time; w (w) n The valve zero point correction value at the nth valve closing time.
When the engine 8 is stopped, the electromagnetic shut-off valve 3 directly shuts off the gas supply to prevent gas leakage; when the engine 8 is running, the fuel gas proportional valve can return to the closed position only under the condition that the air supply is cut off under the reverse towing condition, and the closed position of the fuel gas proportional valve is the return of the fuel gas proportional valve to the zero position.
Assuming that the variable of the number of times the gas proportional valve is closed is n, n=0, 1,2,3, … … in each engine start cycle; the minimum times threshold value of the closing of the gas proportional valve is monitored as B; the gas pressure difference between the inlet and the outlet of the gas proportional valve is delta P, and the pressure drop threshold value is P; the set opening degree of the fuel gas proportional valve is u, and the zero point set threshold value is C; the position sensor monitors that the actual opening variable of the fuel gas proportional valve is x, and the zero position threshold value is A; storing a variable of each measured zero value as y, wherein initial y=0; zero self-learning variable is z, initial z=0; the zero position correction value variable of the fuel gas proportional valve is w.
Mathematical calculation of zero self-learning: when the proportional valve 5 is closed, the position sensor and pressure sensor combined piece 4 measures that the closing opening of the proportional valve 5 is x, and at the moment, the closing opening x is stored in a register of a computer board, so that the use at the back is convenient, and y=x, y is stored in the register. x also requires measuring the opening at the time of closing the next time the proportional valve 5 is closed. z represents a value requiring zero self-learning correction, and w represents the position of the proportional valve 5 after zero-crossing correction. For example, when the proportional valve 5 is closed, x=5%, w=x-z=0%, w is a value obtained by subtracting a value obtained by shifting x by 5% to know and control how large the proportional valve 5 is actually opened by the control unit in the computer board, and when the proportional valve 5 is opened by x=50%, w=45% is changed, so that the computer board knows that the proportional valve 5 is actually opened by 45%, and the actual measurement is unreliable.
Specifically, when the magnitude of y and z satisfies y-z to be larger than D (that is, the current measured x-z is larger than D), if the magnitude of y and z is not known to be equal to D which is several times larger than D, assigning a maximum zero offset threshold value to z, and letting z= 0+D, wherein the zero position after correction becomes w=x-z=x-D, and when the next time is in judgment, assigning x to y, which is measured once again, if y-z is still larger than D (at this time z=d), continuing assigning D to z, z=d+d, and the zero position after correction is w=x-z=x-2D … …; if y-z is smaller than D at a time, the degree of zero point position shift is considered to be within an acceptable range, and at this time, correction is not performed a plurality of times, and only the value of x needs to be subtracted at the next time, so that z=y, w=x-z=x-y.
In practical application, the second parameter takes the current actual closing position of the gas proportional valve.
That is, y n ＝x n ，x n Is the current actual closed position detected for the nth time.
In practical application, after judging whether the current valve closing accumulated times is greater than a preset valve closing threshold, the method further comprises:
and when the current actual closing position of the fuel gas proportional valve is detected to be out of the zero position threshold range, judging that the fuel gas proportional valve has zero offset faults.
If the valve closing position x is outside the zero position threshold range A, then the zero offset fault is directly reported, i.e., when n > B, x n And (3) reporting zero point offset faults.
That is, the current actual closed position cannot be restored to the zero position by correction, and here, an alarm is required, and correction is performed manually.
In practical application, after judging whether the current valve closing accumulated times are greater than a preset valve closing threshold, if judging whether the current valve closing accumulated times are greater than the preset valve closing threshold, further comprising:
and determining that the second parameter is 0, and the zero point correction value is the current actual closing position.
Specifically, as shown in fig. 4, the zero self-learning function of the valve closing position is entered, and the zero self-learning method is as follows:
(1) when the valve is detected to be closed for the nth time, whether n is smaller than a minimum number threshold B of the valve returning to the zero position or not is judged to prevent false alarm, and if n is smaller than the minimum number threshold B of the valve returning to the zero position, zero offset fault judgment and zero self-learning functions are not carried out.
Specifically, when n.ltoreq.B, y n ＝x n ，z n ＝0，w n ＝x n Zero point offset faults are not diagnosed, and zero point self-learning is not started.
It should be noted that the vehicle is powered up by inserting a key, started, the engine is running, stopped, and the key is powered down, which is considered to be one cycle. In one cycle, the proportional valve 5 is closed as long as the fuel is cut off, so the engine computer board, i.e. the electronic control unit, records once, and in the next cycle, the closing times of the proportional valve is recorded again from 0. Assuming that the proportional valve 5 is turned off for n times, the minimum turn-off times B and B are the times of key power-on, when the engine is started, the operation of self-detection and the like is needed when the proportional valve 5 is turned off for the previous times because each electric element is just electrified, the measurement precision of each sensor is affected, and the detection error is possible. When the closing times of the proportional valve is larger than B, the system is considered to be completely operated normally, and zero self-learning can be formally started. Zero self-learning is performed in each cycle, but the last learned value of the previous cycle is stored in each cycle, so that zero is not needed when the condition is satisfied again next time.
(2) When the valve is detected to be closed for the nth time and n is larger than the zero position minimum times threshold B, if the valve closing position x is out of the zero position threshold range A, the zero offset fault is directly reported.
Specifically, when n > B, x n And (3) reporting zero point offset faults.
As is clear from the above description, having sent a command to close the proportional valve 5, the proportional valve 5 starts to execute the closing command, and when the measured position of the combination 4 of the position sensor and the pressure sensor is greater than the given zero point threshold a, the proportional valve is considered to have not been closed yet. If the pressure is always larger than A, the proportional valve 5 is considered to be bad, and if the proportional valve is not closed or blocked, a fault is reported, and the next action can not be performed on the instrument panel of the cab.
(3) And when the valve closing is detected for the nth time and n is greater than the minimum number threshold B of the zero position, if the valve closing position x is within the second parameter threshold range A, performing a zero self-learning function.
Specifically, when n > B and x n Y is less than or equal to A n ＝x n If y n -z n ＞D，z n ＝z n -1+d; otherwise, z n ＝y n . Valve zero correction value w n ＝x n -z n 。
Through zero self-learning, the opening of the valve is corrected, and the proper and correct fuel gas supply flow can still be provided under the condition of zero offset of the valve.
When the proportional valve 5 is closed, the actual measurement position x n If x n Assigned to y n Subtracting z n If the zero point offset is larger than the zero point offset threshold D, it is considered that the zero point offset is not within an acceptable range, and a series of corrections are required to make the actual measurement position gradually smaller. If y n -z n If the zero position is smaller than the threshold D, the zero position is considered to be slightly offset, but the zero position is not too much influenced, multiple corrections are not needed, and only x is needed to be added next time n Subtracting z n And (3) obtaining the product.
It should be noted that, each variable corresponds to: the gas pipeline inlet pressure temperature sensor 2 can only detect the gas pressure and temperature in front of the electromagnetic cut-off valve 3; a combination 4 of position sensor and pressure sensor, which can measure the actual opening of the proportional valve 5, i.e. x n The subscript n is the closing times of the proportional valve, and n-1 represents the last time the proportional valve is closed, and is not described in detail herein, and is within the protection scope of the application; the combination 4 of the position sensor and the pressure sensor can also measure the gas pressure at the inlet of the proportional valve 5. The gas pipeline outlet gas pressure temperature sensor 6 can measure the gas outlet gas pressure of the proportional valve 5. All the threshold values A, B, C, D and the like are set values written into the computer board according to certain test results or experience, and are values which are not changed as long as the values are determined. The specific values are not repeated here, and can be determined according to actual conditions, and are all within the protection scope of the application.
In the embodiment, the gas proportional valve is normally opened and safely closed by utilizing the front and rear pressure temperature sensors, the proportional valve position sensors, the electromagnetic cut-off valve and the like on the gas proportional valve for gas opening and closing position zero self-learning electric control logic control, so that gas leakage and pipeline blockage are prevented, and false alarm of related faults is reduced.
The application further provides a control device for the fuel gas proportional valve of the natural gas engine.
A natural gas engine gas proportional valve control device comprising:
the first judging unit is used for judging whether the fuel gas proportional valve currently meets the zero position self-learning condition.
And the accumulated valve closing frequency unit is used for determining that the current valve closing accumulated frequency of the fuel gas proportional valve is detected if the judgment result of the first judgment unit is yes.
And the second judging unit is used for judging whether the current valve closing accumulated times are larger than a preset valve closing threshold value or not.
And the correction unit is used for correcting the fuel gas proportional valve when the current actual closing position of the fuel gas proportional valve is detected to be in the zero position threshold range if the judgment result of the second judgment unit is yes.
In practical application, the correction unit is used for correcting the fuel gas proportional valve, and is specifically used for:
judging y n -z n Whether greater than a zero offset threshold.
If yes, then determine z n ＝z n-1 +D; if not, then determine z n ＝y n 。
Determining w n ＝x n- z n 。
Wherein D is a zero offset threshold; y is n Is the second parameter when the valve is closed for the nth time; z n The zero self-learning value is obtained when the valve is closed for the nth time; z n-1 The zero self-learning value is the zero self-learning value when the valve is closed for the n-1 th time; w (w) n The valve zero point correction value at the nth valve closing time.
In practical application, the method further comprises the following steps:
and the fault unit is used for judging that the gas proportional valve has zero offset fault when the current actual closing position of the gas proportional valve is detected to be out of the zero position threshold range if the judgment result of the second judgment unit is yes.
In practical application, the first judging unit is used for judging whether the gas proportional valve currently meets the zero position self-learning condition or not, and is specifically used for:
when the engine enters a reverse-dragging working condition, judging whether the inlet-outlet pressure difference of the fuel gas proportional valve is smaller than a preset pressure drop threshold value, wherein the set opening degree of the fuel gas proportional valve is smaller than a zero point set threshold value, and the current actual closing position is in a zero point position threshold value range.
The details of the working process and principle of each unit are referred to the control method of the gas proportional valve of the natural gas engine provided by the above embodiment, and are not described in detail herein, and are all within the protection scope of the present application.
In this embodiment, the first judging unit judges whether the gas proportional valve currently satisfies the zero position self-learning condition; the accumulated valve closing times unit determines the current valve closing accumulated times of the detected fuel gas proportional valve if the judgment result of the first judgment unit is yes; the second judging unit judges whether the current valve closing accumulated times are larger than a preset valve closing threshold value or not; if the judgment result of the second judgment unit is yes, the correction unit corrects the fuel gas proportional valve when detecting that the current actual closing position of the fuel gas proportional valve is in the zero position threshold range; therefore, under the condition of zero point offset, the opening degree of the fuel gas proportional valve can be corrected, so that the fuel gas proportional valve can still provide proper and correct fuel gas supply flow, the fuel gas leakage and the pipeline blockage are prevented, the problem of false alarm due to faults is reduced, and the control strategy is more comprehensive and accurate compared with the existing control strategy.
Features described in the embodiments in this specification may be replaced or combined, and identical and similar parts of the embodiments may be referred to each other, where each embodiment focuses on 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 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. The control method of the fuel gas proportional valve of the natural gas engine is characterized by comprising the following steps of:
judging whether the gas proportional valve currently meets a zero position self-learning condition or not;
if yes, determining the current closing frequency of the gas proportional valve;
judging whether the current valve closing accumulated times are larger than a preset valve closing threshold value or not;
and if the current valve closing accumulated times are larger than the preset valve closing threshold, correcting the gas proportional valve when the current actual closing position of the gas proportional valve is detected to be in the zero position threshold range.
2. The method of controlling a gas proportional valve of a natural gas engine according to claim 1, wherein correcting the gas proportional valve comprises:
judging whether yn-zn is larger than a zero offset threshold value or not;
if yes, then zn=zn-1+d is determined; if not, then zn=yn is determined;
determining wn = xn-zn;
wherein D is a zero offset threshold; yn is a second parameter when the valve is closed for the nth time; zn is a zero self-learning value when the valve is closed for the nth time; zn-1 is a zero self-learning value when the valve is closed for the n-1 th time; wn is the valve zero point correction value when the valve is closed for the nth time; xn is the current actual closed position.
3. The method of claim 2, wherein the second parameter is a current actual closed position of the gas proportional valve.
4. The method according to claim 1, wherein after determining whether the current valve closing integrated number is greater than a preset valve closing threshold, if the current valve closing integrated number is greater than the preset valve closing threshold, further comprising:
and when the current actual closing position of the fuel gas proportional valve is detected to be out of the zero position threshold range, judging that the fuel gas proportional valve has zero offset faults.
5. The method according to claim 2, wherein after determining whether the current valve closing integrated number is greater than a preset valve closing threshold, if determining whether the current valve closing integrated number is greater than the preset valve closing threshold, further comprising:
and determining that the second parameter is 0 and the zero point correction value is the current actual closing position.
6. The control method of a natural gas engine fuel gas proportional valve according to any one of claims 1 to 5, wherein determining whether the fuel gas proportional valve currently satisfies a zero position self-learning condition includes:
when the engine enters a reverse-dragging working condition, judging whether the inlet-outlet pressure difference of the fuel gas proportional valve is smaller than a preset pressure drop threshold value, wherein the set opening degree of the fuel gas proportional valve is smaller than a zero point set threshold value, and the current actual closing position is in a zero point position threshold value range.
7. A natural gas engine gas proportional valve control device, comprising:
the first judging unit is used for judging whether the fuel gas proportional valve currently meets the zero position self-learning condition;
the accumulated valve closing frequency unit is used for determining that the current valve closing accumulated frequency of the fuel gas proportional valve is detected if the judgment result of the first judgment unit is yes;
the second judging unit is used for judging whether the current valve closing accumulated times are larger than a preset valve closing threshold value or not;
and the correction unit is used for correcting the fuel gas proportional valve when the current actual closing position of the fuel gas proportional valve is detected to be in the zero position threshold range if the judgment result of the second judgment unit is yes.
8. The natural gas engine fuel gas proportional valve control device according to claim 7, wherein the correction unit is configured to, when correcting the fuel gas proportional valve, specifically:
judging whether yn-zn is larger than a zero offset threshold value or not;
if yes, then zn=zn-1+d is determined; if not, then zn=yn is determined;
determining wn = xn-zn;
wherein D is a zero offset threshold; yn is a second parameter when the valve is closed for the nth time; zn is a zero self-learning value when the valve is closed for the nth time; zn-1 is a zero self-learning value when the valve is closed for the n-1 th time; and wn is a valve zero point correction value at the nth valve closing time.
9. The natural gas engine fuel gas proportional valve control device of claim 7, further comprising:
and the fault unit is used for judging that the gas proportional valve has zero offset fault when the current actual closing position of the gas proportional valve is detected to be out of the zero position threshold range if the judgment result of the second judgment unit is yes.
10. The natural gas engine fuel gas proportional valve control device according to any one of claims 7 to 9, wherein the first judging unit is configured to, when judging whether the fuel gas proportional valve currently satisfies a zero position self-learning condition, specifically:
when the engine enters a reverse-dragging working condition, judging whether the inlet-outlet pressure difference of the fuel gas proportional valve is smaller than a preset pressure drop threshold value, wherein the set opening degree of the fuel gas proportional valve is smaller than a zero point set threshold value, and the current actual closing position is in a zero point position threshold value range.
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