CN113756998A - Method for acquiring air flow and commercial vehicle - Google Patents
Method for acquiring air flow and commercial vehicle Download PDFInfo
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- CN113756998A CN113756998A CN202111025335.5A CN202111025335A CN113756998A CN 113756998 A CN113756998 A CN 113756998A CN 202111025335 A CN202111025335 A CN 202111025335A CN 113756998 A CN113756998 A CN 113756998A
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- 238000000034 method Methods 0.000 title claims abstract description 52
- 230000003068 static effect Effects 0.000 claims description 4
- 238000012423 maintenance Methods 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 115
- 230000001276 controlling effect Effects 0.000 description 11
- 230000000694 effects Effects 0.000 description 11
- 239000002912 waste gas Substances 0.000 description 5
- 230000007613 environmental effect Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 230000002026 carminative effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- 239000000126 substance Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/45—Sensors specially adapted for EGR systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/45—Sensors specially adapted for EGR systems
- F02M26/46—Sensors specially adapted for EGR systems for determining the characteristics of gases, e.g. composition
- F02M26/47—Sensors specially adapted for EGR systems for determining the characteristics of gases, e.g. composition the characteristics being temperatures, pressures or flow rates
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/45—Sensors specially adapted for EGR systems
- F02M26/48—EGR valve position sensors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/52—Systems for actuating EGR valves
- F02M26/53—Systems for actuating EGR valves using electric actuators, e.g. solenoids
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Flow Control (AREA)
Abstract
The invention provides a method for acquiring gas flow and a commercial vehicle, which are used for acquiring the current gas flow of gas flowing through a valve of an electric actuator, wherein the method for acquiring the gas flow comprises the following steps: controlling the valve to be opened or closed based on the opening state of the electric actuator, and acquiring the opening and closing angle of the valve; based on the fact that a pressure sensing device is arranged on the electric actuator, the pressure value of the gas is obtained; and acquiring the gas flow of the gas flowing through the valve according to the angle and the pressure value. The embodiment of the invention solves the technical problem that the maintenance cost of the flowmeter and other equipment is higher when the electric actuator works.
Description
Technical Field
The invention relates to the technical field of electric actuators, in particular to a method for acquiring the current gas flow of gas flowing through a valve of an electric actuator.
Background
With the development of the industrial technology of the commercial vehicle, the electric control actuator is used as an important component of the commercial vehicle, and the electric equipment has certain influence on the development of the automobile industry.
Under the prospect that environmental protection and energy-conservation were paid attention to increasingly, commercial car can install exhaust gas circulation system in engine department, when suddenly violently refueling, fuel in the engine can incomplete combustion to can be mingled with certain combustible substance in the waste gas, the valve through electric actuator control exhaust gas circulation system department is opened this moment, makes partial waste gas get into the engine and burns again, has reduced carminative pollution promptly, makes exhaust gas cyclic utilization again, has played energy-conserving effect.
The current electric actuator needs to control the opening and closing states of the valve according to the magnitude of the air flow measured by the flow meter, and because the flow meter and other equipment have higher maintenance cost, the electric actuator usually wastes a lot of resources when in work.
Disclosure of Invention
The invention solves the technical problems of high equipment maintenance cost and high use cost.
In order to solve the above problem, the present invention provides a method for acquiring a gas flow rate, which is used for acquiring a current gas flow rate flowing through a valve of an electric actuator, and the method for acquiring the gas flow rate comprises the following steps: controlling the valve to be opened or closed based on the opening state of the electric actuator, and acquiring the opening and closing angle of the valve; based on the fact that a pressure sensing device is arranged on the electric actuator, the pressure value of the gas is obtained; and acquiring the gas flow of the gas flowing through the valve according to the angle and the pressure value.
Compared with the prior art, the technical scheme has the following technical effects: through the opening and closing angle of the valve and the acquired pressure value, the gas flow passing through the gas is calculated, the logic is simple, and the calculation result is accurate. The calculation is carried out according to the angle of the valve, so that the method is visual, the efficiency is improved, the use of a flowmeter is reduced, and the equipment cost is saved.
In an embodiment of the present invention, the controlling the opening or closing of the valve specifically includes: controlling the valve to close under the condition that no gas flows through the valve; and/or controlling the valve to open in the case of gas flow through the valve.
Compared with the prior art, the technical scheme has the following technical effects: when the valve is in a closed state, the electric actuator is in an initial state, the electricity consumption is less, the electricity consumption of the machine is saved, the valve is controlled to be closed more simply according to whether the air flow needs to be transmitted in the pipeline, and the labor is saved.
In an embodiment of the present invention, the obtaining the opening and closing angle of the valve specifically includes: acquiring the angle of the valve to be zero based on the valve being in a closed state; and acquiring the opening angle of the valve according to the position relation between the valve and the pipeline based on the opening state of the valve.
Compared with the prior art, the technical scheme has the following technical effects: the angle is obtained according to the valve opening and closing state, and calculation is facilitated.
In one example of the present invention, the method of acquiring an amount of airflow further comprises: according to angle and pressure value, obtain the gas flow that gas flowed through the valve, specifically include: acquiring a first flow rate and a second flow rate of the gas within a first target time range based on the valve opening; wherein the first flow rate is the flow rate of gas through the gas inlet of the conduit; the second flow rate is the flow rate of the gas passing through the gas outlet of the pipeline; and acquiring the gas flow of the gas flowing through the valve according to the average value, the angle and the pressure value of the first flow speed and the second flow speed.
Compared with the prior art, the technical scheme has the following technical effects: through simple calculation, more accurate flow velocity is obtained, and the air flow is conveniently obtained.
In one example of the present invention, acquiring the gas flow rate of the gas flowing through the valve according to the angle and the pressure value specifically includes: acquiring a first pressure value and a second pressure value of the gas within a second target time range based on the opening state of the valve; the first pressure value is the pressure value of the gas in a static state, and the second pressure value is the pressure value of the gas in a flowing state; calculating a differential pressure value of the first pressure value and the second pressure value; and acquiring the gas flow of the gas flowing through the valve according to the angle and the differential pressure value.
Compared with the prior art, the technical scheme has the following technical effects: the average value is helpful for more intuitively knowing the magnitude of the comprehensive pressure of the gas in the current valve opening state.
In one example of the present invention, the method of acquiring an amount of airflow further comprises: and adjusting the opening angle of the valve according to the acquired air flow.
Compared with the prior art, the technical scheme has the following technical effects: the electric actuator judges whether the opening and closing angle of the valve needs to be adjusted according to the current acquired air flow, the current circulation of air in the pipeline is adjusted more quickly, and the temperature rise and performance reduction of the equipment after long-time working are prevented.
In one embodiment of the present invention, the adjusting the opening angle of the valve according to the acquired air flow specifically includes: presetting the rated flow of gas; under the condition that the air flow is larger than the rated flow, the adjusting angle is enlarged; and/or the adjustment angle becomes smaller in the case of an air flow smaller than the rated flow.
Compared with the prior art, the technical scheme has the following technical effects: the opening angle of the valve is adjusted through the acquired air flow, so that the problem that the air flow in the pipeline is too large or too small is effectively solved.
In one example of the present invention, the method of acquiring an amount of airflow further comprises: presetting the rated flow of gas; and judging whether to acquire the airflow for the second time according to the error value between the acquired airflow and the rated flow.
Compared with the prior art, the technical scheme has the following technical effects: the working mode of the electric actuator equipment can be adjusted in time when the air flow data is obtained, and the purposes of saving time and resources and accurately controlling the equipment are achieved.
In an embodiment of the present invention, the determining whether to acquire the airflow twice specifically includes: presetting a threshold value of an error value; stopping acquiring the air flow when the error value is smaller than the threshold value; and under the condition that the error value is larger than the threshold value, controlling the angle of the valve to secondarily acquire the air flow.
Compared with the prior art, the technical scheme has the following technical effects: whether the secondary air flow is needed or not is judged according to the error, and the method is simpler and more intuitive and is easy to calculate.
In one example of the invention, a commercial vehicle is provided, which implements the steps of the method of capturing an air flow volume of any of the embodiments of the invention.
After the technical scheme of the invention is adopted, the following technical effects can be achieved:
through the relation between the opening and closing angle of the valve and the set pressure value, the gas flow passing through the gas is calculated, the logic is simple, and the calculation result is accurate. The method has the advantages that the operation condition of the electric actuator equipment is detected in real time on the one hand by obtaining the air flow, the flow meter is saved, calculation is carried out according to the angle of the valve, the efficiency is improved, the flow meter is reduced, and the equipment cost is saved. On the other hand, the working mode of the electric actuator equipment can be adjusted in time when the air flow data is obtained, and the purposes of saving time and resources and accurately controlling the equipment are achieved.
Drawings
Fig. 1 is a flow chart of a first step of a method of acquiring an amount of airflow in accordance with some embodiments of the present invention.
Fig. 2 is a flow chart of a second step of a method of capturing airflow in accordance with some embodiments of the present invention.
Fig. 3 is a flow chart of a third step of a method of capturing airflow in accordance with some embodiments of the present invention.
Fig. 4 is a flow chart of a fourth step of a method of acquiring an amount of airflow in accordance with some embodiments of the present invention.
Fig. 5 is a flow chart of a fifth step of a method of acquiring an amount of airflow according to some embodiments of the present invention.
Fig. 6 is a flow chart of a sixth step of a method of acquiring an amount of airflow according to some embodiments of the present invention.
Fig. 7 is a flow chart of a seventh step of a method of acquiring an amount of airflow in accordance with some embodiments of the present invention.
Fig. 8 is a flow chart of an eighth step of a method of capturing airflow according to some embodiments of the present invention.
Fig. 9 is a flow chart of a ninth step of a method of capturing airflow according to some embodiments of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
The first embodiment is as follows:
referring to fig. 1, the present invention provides a method for acquiring a gas flow rate, which is used for acquiring a gas flow rate of a current gas flowing through a valve of an electric actuator, and the method for acquiring the gas flow rate comprises the following steps:
step S101, controlling the valve to be opened or closed based on the fact that the electric actuator is in an opening state, and obtaining the opening and closing angle of the valve;
step S102, acquiring a pressure value of gas based on a pressure sensing device arranged on an electric actuator;
step S103 obtains the gas flow rate of the gas flowing through the valve according to the angle and the pressure value.
The method of acquiring the amount of airflow in the present embodiment is applicable to the method of acquiring the amount of airflow of the electric actuator according to any embodiment of the present invention.
In particular, an electric actuator is a drive device that provides linear or rotational motion and has a basic actuator within it for driving a valve to a fully open or fully closed position. The electric actuator of the embodiment has a precise actuating mechanism which can control the valve, so that the valve is fixedly moved to any position of the pipeline. The pipeline is used for conveying secondary waste gas, the valve is closed to prevent gas in the pipeline from being conveyed, the valve is opened to enable the gas in the pipeline to circulate, and partial waste gas enters the engine to be combusted again, so that exhaust pollution is reduced, and the waste gas is recycled.
Further, the acquired gas flow rate of the present embodiment refers to the gas flow rate of the exhaust gas passing through the pipe of the electric actuator, that is, the volume flow rate of the gas, and the acquired gas flow rate may be the precisely calculated gas flow rate or the roughly estimated gas flow rate by some formula. The electric actuator is in an opening state after being powered on, the opening or closing of the valve is controlled through the actuating mechanism, when the valve is opened or closed, the valve can move to the relative position of the valve and the pipeline, and the opening and closing angle of the valve is obtained according to the relative position. The pipeline of the electric actuator is provided with a pressure sensing device which can obtain the pressure value of the gas, and the pressure value is the air pressure value. The air flow passing through the gas is calculated through the opening and closing angle and the pressure value of the valve, the logic is simple, and the calculation result is accurate. The calculation is carried out according to the angle of the valve, so that the method is visual, the efficiency is improved, the use of a flowmeter is reduced, and the equipment cost is saved.
Preferably, the bernoulli equation can be used, the pressure sensing device measures the pressure of the gas currently flowing through the pipeline, and the gas flow of the gas can be calculated according to a formula.
Example two:
referring to fig. 2, the present embodiment provides a method of acquiring an amount of airflow. In addition to the technical features of embodiment 1 described above, the present embodiment further includes the following technical features.
The control valve is opened or closed, and specifically comprises:
step S1001, under the condition that no gas flows through the valve, controlling the valve to be closed; and/or
In step S1002, the valve is controlled to be opened when gas flows through the valve.
In this embodiment, the actuator controls the valve to move to the open and closed positions according to whether the pipeline requires gas to flow through. Specifically, the electric actuator is in an open state after being powered on, and the valve is initially in a closed state. When no gas needs to flow through the valve, the actuator is in standby, and the valve is always in a closed state; when gas needs to flow through the valve, the actuator controls the valve to open so that the gas passes through the pipeline; when the electric actuator operates for a period of time and no gas needs to flow through the valve, the actuator controls the valve to close, so that the valve returns to the initial state.
For example, when the valve is in a closed state, the electric actuator is in an initial state, so that the power consumption is less, the power consumption of the machine is saved, the valve is controlled to be closed more simply according to whether the airflow needs to be transmitted in the pipeline, and the labor is saved.
Example three:
referring to fig. 3, the present embodiment provides a method of acquiring an amount of airflow. In addition to the technical features of any of the above embodiments, the present embodiment further includes the following technical features.
Obtain the angle of valve switching, specifically include:
step S2001, acquiring that the angle of the valve is zero based on the valve being in the closed state;
step S2002 obtains the opening angle of the valve according to the position relationship between the valve and the pipeline based on the valve being in the open state.
In this embodiment, it should be noted that the electric actuator is turned on and is in an open state, and when the valve is in a closed state and is not changed, it indicates that the amount of airflow passing through the pipeline is necessarily zero; when the valve is in an open state, the opening and closing angle of the valve is obtained according to the calculation of the relative position relation between the valve and the pipeline. When the valve is opened, the larger the gas sectional area of the pipeline is, the larger the valve angle is, the smaller the gas sectional area of the pipeline is, and the smaller the valve angle is.
Specifically, the angle value is obtained according to the opening and closing state of the valve, calculation is convenient, one-key operation is achieved, and labor is saved.
Example four:
referring to fig. 4, the present embodiment provides a method of acquiring an amount of airflow. In addition to the technical features of any of the above embodiments, the present embodiment further includes the following technical features.
According to angle and pressure value, obtain the gas flow that gas flowed through the valve, specifically include:
step S201, acquiring a first flow rate and a second flow rate of gas within a first target time range based on valve opening; wherein the first flow rate is the flow rate of gas through the gas inlet of the conduit; the second flow rate is the flow rate of the gas passing through the gas outlet of the pipeline;
step S202 obtains the gas flow rate of the gas flowing through the valve according to the average value, the angle and the pressure value of the first flow rate and the second flow rate.
In this embodiment, the electric actuator is powered on and is in an open state, and when the pipeline needs to convey gas, the valve is opened, and a first flow rate and a second flow rate of the gas within a first target time range are measured under the condition of conveying the gas.
Specifically, since the flow rate of the gas varies depending on factors such as the size of the obstacle in the gas passage pipe and the ambient temperature, it is necessary to set a measurement time range for measuring the gas flow rate, and the first target time range may be several seconds to several tens of seconds, and the gas flow rate measured during these times is a flow rate within the same target time range.
For example, the cross-sectional areas of the inlet and the outlet of the pipeline are different, the flow velocity of the gas flowing through the inlet and the outlet is different, in order to obtain more accurate flow velocity of the gas, a first flow velocity value and a second flow velocity value are measured, and the flow rate of the gas passing through is obtained according to the average value of the first flow velocity value and the second flow velocity. Through simple calculation, a more accurate flow velocity value is obtained, and the subsequent gas flow is convenient to obtain.
Example five:
referring to fig. 5, the present embodiment provides a method of acquiring an amount of airflow. In addition to the technical features of any of the above embodiments, the present embodiment further includes the following technical features.
According to angle and pressure value, obtain the gas flow that gas flowed through the valve, specifically include:
step S301, acquiring a first pressure value and a second pressure value of the gas within a second target time range based on the opening state of the valve; the first pressure value is the pressure value of the gas in a static state, and the second pressure value is the pressure value of the gas in a flowing state;
step S302, calculating a differential pressure value between the first pressure value and the second pressure value;
step S303 obtains the gas flow rate of the gas flowing through the valve according to the angle and the differential pressure value.
In this embodiment, the electric actuator is turned on, the first pressure value is a pressure value of the gas in the pipeline in a static state when the valve is closed, and the second pressure value is a pressure value of the gas in the pipeline flowing when the valve is just opened and the valve stops moving stably. Because the states of the valve are different when the first pressure value and the second pressure value are measured, a second target time range is set for constraint, the second target time range refers to calculation when the valve is opened and is finished when the second pressure value is measured, the second target time is within a few minutes, such as two minutes, three minutes, five minutes and the like, the second pressure value and the first pressure value are subtracted to obtain a pressure difference value, and a more accurate pressure value is obtained through simple calculation, so that the subsequent gas flow can be conveniently obtained.
For example, when the pipeline needs to transmit gas, the valve is opened, and the pressure value can be continuously measured within a certain time range, so as to obtain the average value of the pressure values. Specifically, the pressure value of the gas may vary with the size of the obstacle in the gas passage pipe, the ambient temperature, and other factors, so that a range of measurement time is required to be specified when the gas pressure is measured, the certain time may be the same as the first target time, the measurement time of the pressure value may range from several seconds to several tens of seconds, or from two minutes to five minutes, the pressure values of a plurality of gases are measured within these times, and then the average value is calculated, which is helpful for more intuitively knowing the gas pressure in the current valve opening state.
Example six:
referring to fig. 6, the present embodiment provides a method of acquiring an amount of airflow. In addition to the technical features of any of the above embodiments, the present embodiment further includes the following technical features.
The method of capturing airflow further comprises:
step S401 adjusts the opening angle of the valve according to the acquired airflow.
For example, the operation condition of the electric actuator equipment is detected in real time to save the flow meter on one hand, and the working mode of the electric actuator equipment can be adjusted in time when the air flow data is obtained on the other hand, so that the purposes of time saving and resource saving of the accurate control equipment are achieved.
Specifically, the electric actuator judges whether the opening and closing angle of the valve needs to be adjusted according to the current acquired air flow, so that the current circulation of air in the pipeline is adjusted more quickly, the temperature of the equipment is prevented from rising after the equipment works for a long time, and the performance of the equipment is prevented from being reduced.
Example seven:
referring to fig. 7, the present embodiment provides a method of acquiring an amount of airflow. In addition to the technical features of any of the above embodiments, the present embodiment further includes the following technical features.
According to the gas flow who obtains, the angle that the regulating valve opened specifically includes:
step S3000, presetting the rated flow of gas;
step S3001, under the condition that the air flow is larger than the rated flow, the adjusting angle is enlarged; and/or
In step S3002, the adjustment angle is decreased when the airflow amount is smaller than the rated flow amount.
For example, the flow rate of the gas flowing through the pipeline of the electric actuator is stable under a certain condition, the rated flow rate of the gas is preset according to the stable condition, the gas flow rate acquired by the electric actuator through any one of the above embodiments is compared with the rated flow rate, and the angle change of the valve is controlled according to the comparison result.
Specifically, when the gas flow is larger than the rated flow, the gas flow is too large, the angle of the valve to be controlled becomes large, and the gas flowing amount is reduced; when the gas flow is smaller than the rated flow, the gas flow is too small, the angle of the control valve needs to be reduced, and the amount of gas flowing through is increased.
The electric actuator judges whether the opening and closing angle of the valve needs to be adjusted according to the current acquired air flow, the current circulation of air in the pipeline is adjusted more quickly, and the temperature rise and performance reduction of the equipment after long-time working are prevented.
Example eight:
referring to fig. 8, the present embodiment provides a method of acquiring an amount of airflow. In addition to the technical features of any of the above embodiments, the present embodiment further includes the following technical features.
The method of capturing airflow further comprises:
step S501, presetting a rated flow of gas;
step S502 determines whether to acquire the airflow twice according to the error value between the acquired airflow and the rated flow.
For example, the air flow is calculated by measuring the pressure value and the opening and closing angle of the valve, and due to various environmental factors and the operating time of the electric actuator device, a certain error may be generated between the calculated air flow and the actual air flow, at this time, the rated flow of the air flow is preset, the error value between the air flow and the rated flow is compared, and whether the air flow needs to be acquired secondarily is determined by the error value.
Specifically, the step of obtaining the airflow twice is the same as the step of obtaining the airflow in any of the embodiments, and the working mode of the electric actuator device can be adjusted in time when the airflow data is obtained, so that the purpose of accurately controlling the device, which saves time and resources, is achieved.
Example nine:
referring to fig. 9, the present embodiment provides a method of acquiring an amount of airflow. In addition to the technical features of any of the above embodiments, the present embodiment further includes the following technical features.
Judging whether to acquire the airflow for the second time, specifically comprising:
step S4000 presets the threshold value of the error value;
step S4001, when the error value is smaller than a threshold value, stopping acquiring the air flow;
and S4002, controlling the angle of the valve to acquire the air flow for the second time when the error value is larger than the threshold value.
For example, when the acquired airflow and the actual airflow have errors, the electric actuator can adjust the opening and closing angle of the current valve, control the gas to flow in the pipeline more stably, and prevent the temperature of the equipment from rising and the performance from lowering after the equipment works for a long time. However, sometimes the airflow cannot be accurately acquired due to environmental factors, temperature, and the like, so a threshold value of the rated error is preset, and whether the airflow needs to be acquired secondarily is determined according to the magnitude relation between the error value and the threshold value of the rated error.
Specifically, under the condition that the error value is smaller than the threshold value, the air flow normally circulates in the pipeline, and secondary air flow acquisition is not needed; under the condition that the error value is larger than the threshold value, the acquired air flow error is overlarge, the electric actuator needs to control the angle of the valve to acquire the air flow for the second time, and more accurate data are calculated. Whether the secondary air flow is needed or not is judged according to the error, and the method is simpler and more intuitive and is easy to calculate.
Example ten:
the present embodiment provides a method of acquiring an amount of airflow. In addition to the technical features of any of the above embodiments, the present embodiment further includes the following technical features.
A commercial vehicle implementing the steps of the method of obtaining airflow of any embodiment of the invention.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A method for acquiring the air flow and a commercial vehicle are characterized in that the method for acquiring the air flow of the current air flowing through a valve of an electric actuator comprises the following steps:
controlling the valve to be opened or closed based on the fact that the electric actuator is in an opening state, and acquiring the opening and closing angle of the valve;
acquiring a pressure value of the gas based on a pressure sensing device arranged on the electric actuator;
and acquiring the gas flow of the gas flowing through the valve according to the angle and the pressure value.
2. The method for obtaining an airflow quantity according to claim 1, wherein said controlling the opening or closing of the valve specifically comprises:
controlling the valve to close in the absence of the gas flowing through the valve; and/or
And controlling the valve to be opened under the condition that the gas flows through the valve.
3. The method for acquiring the airflow quantity according to claim 2, wherein the acquiring the opening and closing angle of the valve specifically comprises:
acquiring that the angle of the valve is zero based on the valve being in a closed state;
and acquiring the opening angle of the valve according to the position relation between the valve and the pipeline based on the opening state of the valve.
4. The method for obtaining the amount of gas flow according to claim 3, wherein obtaining the amount of gas flow of the gas through the valve according to the angle and the pressure value comprises:
obtaining a first flow rate and a second flow rate of the gas within a first target time range based on the valve opening; wherein the first flow rate is a flow rate of the gas through a gas inlet of the conduit; the second flow rate is the flow rate of the gas through the gas outlet of the duct;
and acquiring the gas flow of the gas flowing through the valve according to the average value of the first flow speed and the second flow speed, the angle and the pressure value.
5. The method for obtaining the amount of gas flow according to claim 3, wherein obtaining the amount of gas flow of the gas through the valve according to the angle and the pressure value comprises:
acquiring a first pressure value and a second pressure value of the gas within a second target time range based on the opening state of the valve;
the first pressure value is a pressure value of the gas in a static state, and the second pressure value is a pressure value of the gas in a flowing state;
calculating a differential pressure value of the first pressure value and the second pressure value;
and acquiring the gas flow of the gas flowing through the valve according to the angle and the differential pressure value.
6. The method of acquiring an airflow volume of any of claims 1 to 5, further comprising:
adjusting the angle at which the valve opens based on the amount of airflow captured.
7. The method for sensing an amount of airflow according to claim 6, wherein said adjusting said angle at which said valve opens based on said sensed amount of airflow comprises:
presetting the rated flow of the gas;
in the case that the air flow is larger than the rated flow, adjusting the angle to be larger; and/or
In the case where the air flow rate is smaller than the rated flow rate, the angle is adjusted to be smaller.
8. The method of acquiring an airflow volume of any of claims 1 to 5, further comprising:
presetting the rated flow of the gas;
and judging whether the air flow is acquired for the second time or not according to the acquired error value between the air flow and the rated flow.
9. The method for acquiring the airflow quantity according to claim 8, wherein the determining whether to acquire the airflow quantity for the second time specifically comprises:
presetting a threshold value of the error value;
stopping acquiring the air flow quantity when the error value is smaller than the threshold value;
and controlling the angle of the valve to acquire the air flow for the second time under the condition that the error value is larger than the threshold value.
10. A commercial vehicle, characterized in that it implements the steps of the method of capturing an air flow volume according to any one of claims 1 to 9.
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