CN112747796A - Measuring device and calculating method for air intake flow of diesel engine - Google Patents
Measuring device and calculating method for air intake flow of diesel engine Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
- G01F1/34—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure
- G01F1/36—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure the pressure or differential pressure being created by the use of flow constriction
- G01F1/40—Details of construction of the flow constriction devices
- G01F1/44—Venturi tubes
Abstract
The invention discloses a device and a method for measuring the air intake flow of a diesel engine, and belongs to the technical field of diesel engines. The device for measuring the intake air flow of the diesel engine comprises a Venturi tube, a first sensor, a second sensor, a third sensor, a calculation module and a control unit; the Venturi tube is arranged at the air inlet end of an air inlet manifold of the diesel engine; the first sensor is used for detecting the pressure difference delta F between two ends of the Venturi tube; the second sensor is used for detecting the temperature T at the throat of the Venturi tube; the third sensor is used for detecting the absolute pressure F at the throat of the Venturi tube; the calculation module can calculate the air inlet flow Q in the air inlet manifold according to a calculation formula preset in the calculation module; the control unit is in signal connection with the first sensor, the second sensor and the third sensor respectively, and is in control connection with the calculation module. The advantages are that: the air inlet flow in the air inlet manifold can be accurately obtained, and the air inlet manifold has the characteristics of wide applicability and high reliability.
Description
Technical Field
The invention relates to the technical field of diesel engines, in particular to a device and a method for measuring the air intake flow of a diesel engine.
Background
The intake air flow of an intake manifold of a diesel engine is taken as a key factor directly influencing the performance and emission of the diesel engine, and accurate measurement and accurate control of the intake air flow of the diesel engine are one of main research directions in the field of the diesel engine.
At present, an air flow sensor is mainly adopted to directly measure the air intake flow of a diesel engine, although the air intake flow of the diesel engine can be measured by the air flow sensor; however, since each type of air flow sensor has its own measurement range, and the air flow sensor has different requirements for different air intake systems of the diesel engine, such as the installation position and arrangement manner of the air flow sensor and the influence of a closed crankshaft ventilation system of the diesel engine, the application range of the air flow sensor is small and the operation is inconvenient; in addition, impurities in the air inlet manifold are easily deposited on the air flow sensor in the process of measuring the flow of the air flow sensor on the air inlet manifold of the diesel engine, so that the accuracy of measurement of the air flow sensor is poor, and the performance and the emission of the whole diesel engine are affected.
In view of the above, it is desirable to design a measuring device and a calculating method for the intake air flow of a diesel engine to solve the above problems.
Disclosure of Invention
The invention aims to provide a device for measuring the intake flow of a diesel engine, which can accurately obtain the intake flow in an intake manifold and has the characteristics of wide applicability and high reliability.
In order to achieve the purpose, the invention adopts the following technical scheme:
a diesel engine intake air flow rate measuring apparatus comprising:
the Venturi tube is arranged at the air inlet end of an air inlet manifold of the diesel engine, and the diameter of the Venturi tube is variable;
a first sensor for detecting a pressure difference Δ F between two ends of the venturi tube;
the second sensor is used for detecting the temperature T at the throat of the Venturi tube, and the throat is the position with the minimum inner diameter of the Venturi tube;
a third sensor for detecting an absolute pressure F at the throat of the venturi;
a calculation module capable of calculating an intake air flow rate Q in the intake manifold according to a calculation formula preset in the calculation module;
and the control unit is in signal connection with the first sensor, the second sensor and the third sensor respectively and is in control connection with the calculation module, and the control unit is used for receiving detection signals of the first sensor, the second sensor and the third sensor so as to transmit the detection signals to the calculation module and control the calculation module to calculate the intake air flow Q in the intake manifold.
Preferably, the device for measuring the intake air flow rate of the diesel engine further comprises:
and the CAN communication module is in communication connection with the calculation module and the main controller of the diesel engine respectively, and is used for transmitting the air inflow flow in the air inlet manifold calculated by the calculation module to the main controller.
Preferably, the communication protocol adopted by the CAN communication module is J1939 protocol.
Preferably, the calculation formula in the calculation module is derived by combining a low-pass filtering method and a moving average algorithm.
Preferably, the first sensor, the second sensor and the third sensor are all provided with an operating mode and an adjusting mode, and the adjusting mode is used for adjusting operating parameters of the first sensor, the second sensor and the third sensor.
Preferably, in the air inlet direction, the venturi tube further includes a circular tube section with a constant diameter, a contraction section with a gradually decreasing diameter, and a diffusion section with a gradually increasing diameter, the diffusion section is communicated with the air inlet end of the air inlet manifold, the throat is located between the contraction section and the diffusion section, and the diameter of the throat is constant.
Preferably, the second sensor is a negative temperature coefficient thermistor.
Another object of the present invention is to provide a method for calculating an intake air flow rate of a diesel engine, which can accurately calculate the intake air flow rate in an intake manifold.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method of calculating an intake air flow rate of a diesel engine using the apparatus for measuring an intake air flow rate of a diesel engine as described above, comprising the steps of:
s1: measuring a pressure difference Δ F between two ends of the venturi tube, a temperature T at a throat of the venturi tube and an absolute pressure F at the throat of the venturi tube by the first sensor, the second sensor and the third sensor, respectively, and transmitting the detected Δ F, T and F to the control unit;
s2: the control unit controls the calculation module to calculate so as to obtain an intake air flow rate Q in the intake manifold, and the intake air flow rate Q is calculated according to the calculation formula:
epsilon is the gas expansion coefficient; p is the air density of the throat,
r is the ideal gas constant for air.
Preferably, the value range of Δ F in step S2 is-0.03 bar ≤ Δ F ≤ 0.25bar, the value range of F is 0 ≤ F ≤ 4.5bar, and the value range of T is-40 ℃ ≤ T ≤ 170 ℃.
Preferably, K in the step S2sHas a value range of 0 < Ks≤3600。
The invention has the beneficial effects that:
the method comprises the steps that a Venturi tube with the diameter being variable is connected to the air inlet end of an air inlet manifold of the diesel engine, the pressure difference delta F between the two ends of the Venturi tube is detected through a first sensor, the temperature T at the throat of the Venturi tube is detected through a second sensor, the throat is the minimum inner diameter of the Venturi tube, the absolute pressure F at the throat of the Venturi tube is detected through a third sensor, detection signals of the first sensor, the second sensor and the third sensor are received through a control unit, and the detection signals are transmitted to and control a calculation module to calculate according to a calculation formula preset in the calculation module, so that the air inlet flow in the air inlet manifold can be obtained; by arranging the Venturi tube, the flow measurement is not directly carried out through the air flow sensor, so that the device for measuring the air intake flow of the whole diesel engine is suitable for various types of air intake manifolds, namely, the Venturi tube is only required to be arranged at the air intake end of each type of air intake manifold, the application range is wide, and the operation is simple; and first sensor, second sensor and third sensor are located venturi, and do not directly set up in the air intake manifold, can make its deposit of avoiding the impurity in the air intake manifold in the measuring process to guarantee the measuring accuracy nature. The venturi tube is a device commonly used for measuring the flow rate of a pressure pipeline, belongs to a differential pressure type flowmeter, and is commonly used for measuring the flow rate of fluids such as air, natural gas, coal gas, water and the like.
Drawings
FIG. 1 is a schematic structural diagram of a device for measuring intake air flow of a diesel engine according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of a method for calculating an intake air flow rate of a diesel engine according to a second embodiment of the present invention.
Description of reference numerals:
1-a first sensor; 2-a second sensor; 3-a third sensor; 4-a control unit; 5-a calculation module; 6-CAN communication module; 7-the master controller.
Detailed Description
All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.
Any feature disclosed in this specification may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features. Like reference numerals refer to like elements throughout the specification.
In order to make the technical problems solved, the technical solutions adopted and the technical effects achieved by the present invention clearer, the technical solutions of the present invention are further described below by way of specific embodiments with reference to the accompanying drawings.
Example one
In the embodiment, the device for measuring the air inflow of the diesel engine and the diesel engine provided with the device for measuring the air inflow of the diesel engine are provided, so that the calculated air inflow in the air inlet manifold of the diesel engine is accurate, other relevant working parameters matched with the air inflow can be set according to the air inflow of the diesel engine, and the performance and the emission effect of the whole diesel engine are good. In this embodiment, the diesel engine is a national six-diesel engine. In other embodiments, the diesel engine may be a national fifth diesel engine. In other embodiments, the diesel engine intake air flow measuring device can be used for measuring other engines needing intake air flow measurement.
Specifically, as shown in fig. 1, the device for measuring the intake air flow rate of a diesel engine includes a venturi tube (not shown in the figure), a first sensor 1, a second sensor 2, and a third sensor 3. The venturi tube is arranged at the air inlet end of an air inlet manifold (not shown in the figure) of the diesel engine, and the diameter of the venturi tube is variable, so that the air can generate pressure difference through the venturi tube, and the measurement of the air inlet flow is facilitated; the first sensor 1 is arranged on the Venturi tube and used for detecting the pressure difference delta F between two ends of the Venturi tube; the second sensor 2 is arranged on the Venturi tube and used for detecting the temperature T at the throat of the Venturi tube, and the throat is the position with the minimum inner diameter of the Venturi tube; a third sensor 3 is provided on the venturi for detecting the absolute pressure F at the throat of the venturi. The venturi tube is a device commonly used for measuring the flow rate of a pressure pipeline, belongs to a differential pressure type flowmeter, and is commonly used for measuring the flow rate of fluids such as air, natural gas, coal gas, water and the like. In this embodiment, the first sensor 1 is a differential pressure sensor, the second sensor 2 is a temperature sensor, and the third sensor 3 is a pressure sensor. In the present embodiment, the second sensor 2 is a negative temperature coefficient thermistor, and the second sensor 2 is a positive temperature coefficient thermistor. The negative temperature coefficient thermistor has the characteristics of high temperature acquisition speed and high working reliability. A negative temperature coefficient thermistor is also called an NTC thermistor, which is a sensor resistor with a resistance value decreasing with an increase in temperature, and is widely used in various electronic components.
Further, as shown in fig. 1, the device for measuring the intake air flow rate of the diesel engine further comprises a calculation module 5 and a control unit 4. The calculation module 5 can calculate the intake air flow Q in the intake manifold according to a calculation formula preset in the calculation module 5; the control unit 4 is respectively in signal connection with the first sensor 1, the second sensor 2 and the third sensor 3, the control unit 4 is in control connection with the calculation module 5, and the control unit 4 is used for receiving detection signals of the first sensor 1, the second sensor 2 and the third sensor 3, so as to transmit the detection signals to the calculation module 5 and control the calculation module 5 to calculate according to a calculation formula, and thus the air intake flow in the air intake manifold is obtained. The computing module 5 and the control unit 4 in this embodiment are both common structures in the prior art, and therefore, the structure and the working principle thereof are not described in detail herein.
The method comprises the steps that a Venturi tube with the diameter being variable is connected to the air inlet end of an air inlet manifold of the diesel engine, the pressure difference delta F between the two ends of the Venturi tube is detected through a first sensor 1, the temperature T at the throat of the Venturi tube is detected through a second sensor 2, the throat is the minimum inner diameter of the Venturi tube, the absolute pressure F at the throat of the Venturi tube is detected through a third sensor 3, detection signals of the first sensor 1, the second sensor 2 and the third sensor 3 are received through a control unit 4, and the detection signals are transmitted to and control a calculation module 5 to calculate according to a calculation formula, so that the air inlet flow in the air inlet manifold can be obtained; by arranging the Venturi tube, the flow measurement is not directly carried out through the air flow sensor, so that the device for measuring the air intake flow of the whole diesel engine is suitable for various types of air intake manifolds, namely, the Venturi tube is only required to be arranged at the air intake end of each type of air intake manifold, the application range is wide, and the operation is simple; and first sensor 1, second sensor 2 and third sensor 3 are located venturi, and do not directly set up in the air intake manifold, can make its deposit of avoiding the impurity in the air intake manifold at the in-process of measuring to guarantee the measuring accuracy nature.
Specifically, the venturi tube is arranged in a reducing mode to realize that air pressure difference is generated at two ends of the venturi tube; in the air inlet direction, the Venturi tube also comprises a round tube section with a constant diameter, a contraction section with a gradually reduced diameter and a diffusion section with a gradually increased diameter, the diffusion section is communicated with the air inlet end of the air inlet manifold, the throat opening is positioned between the contraction section and the diffusion section, and the diameter of the throat opening is constant; the venturi circuit has the simplest tubular arrangement, where the fluid flows through venturi tubes of different diameters, to be able to avoid excessive aerodynamic drag; the venturi tube is actually a gas inlet flow field regulator, although pressure loss is generated when gas flows to the gas inlet manifold through the reducing venturi tube, the generated pressure loss is small, and the normal use performance of the diesel engine cannot be influenced; the flow measurement with the maximum precision and the service life can be obtained by arranging the Venturi tube.
Further, as shown in fig. 1, the device for measuring the intake air flow of the diesel engine further includes a CAN communication module 6, the CAN communication module 6 is in communication connection with the calculation module 5 and a main controller 7 of the diesel engine respectively, and the CAN communication module 6 is used for transmitting the intake air flow in the intake manifold calculated by the calculation module 5 to the main controller 7 of the diesel engine, so that the main controller 7 CAN set other working parameters of the diesel engine according to the calculated specific intake air flow, and the use performance of the diesel engine is better and the emission is optimized. The main controller 7 of the diesel engine in this embodiment is a common main controller 7 in the prior art, and therefore, the structure and the control principle of the main controller 7 are not described in detail herein.
The CAN communication module 6 is an intelligent electric control device for realizing communication data forwarding among all electronic control devices of the whole vehicle, so that the whole vehicle realizes a regional network control system of a vehicle-mounted electric control device; the CAN communication module 6 adopts a powerful 16-bit microcontroller with two CAN controllers. Wherein, the communication protocol that CAN communication module 6 adopted is the J1939 protocol to CAN make the reliability of communication higher and guaranteed whole diesel engine intake air flow's measuring device's commonality. The CAN communication module 6 in this embodiment is a common communication module in the prior art, and therefore, the structure and the communication principle of the CAN communication module 6 are not described in detail herein.
Specifically, as for the air pressure difference, in combination with the influence of the actual working environment, the detection signal detected by the first sensor 1 is easily doped with signals in which the disturbance signal, the vibration signal, and the pulse signal are independent of the air pressure difference, but these independent signals have a certain influence on the final calculation of the intake air flow rate, and therefore the independent signals need to be filtered before the calculation of the intake air flow rate.
In order to solve the above problems, when the calculation module 5 derives the calculation formula for calculating the intake air flow rate in the intake manifold, an algorithm combining a low-pass filtering method and a moving average algorithm is adopted, so that the calculation formula for calculating the intake air flow rate in the intake manifold can filter irrelevant signals before calculating the intake air flow rate, and therefore, the accuracy of the finally calculated intake air flow rate according to the calculation formula can be ensured to be higher, and the accuracy of the intake air flow rate is further ensured. The low-pass filtering method is a filtering method, and the low-frequency signal can normally pass through the low-pass filtering method, while the high-frequency signal exceeding a set critical value is blocked and weakened. But the blocking and weakening amplitude can be changed according to different frequencies and different filtering programs; the moving average method is also called moving average method; the moving average method is a method for calculating a moving average value by sequentially increasing and decreasing new and old data periodically on the basis of a simple average method so as to eliminate accidental variation factors, find out the development trend of the factors and predict the factors according to the development trend. The moving average method is a kind of trend extrapolation technique, and actually performs curve fitting on a data sequence with obvious load change trend, and then predicts the value at a certain point in the future by using a new curve.
Specifically, each of the first sensor 1, the second sensor 2, and the third sensor 3 is provided with an operating mode and an adjusting mode, and the adjusting mode is used for adjusting operating parameters of the first sensor 1, the second sensor 2, and the third sensor 3 so that the first sensor 1, the second sensor 2, and the third sensor 3 can normally operate in the operating mode, and therefore the first sensor 1, the second sensor 2, and the third sensor 3 can measure intake air flow rates of various types of intake manifolds, and further the application range of the device for measuring intake air flow rates of a diesel engine is large.
Example two
The embodiment provides a method for calculating the intake air flow of a diesel engine, which uses a device for measuring the intake air flow of the diesel engine in the first embodiment, and as shown in fig. 2, the method for calculating the intake air flow of the diesel engine comprises the following steps:
s1: measuring a pressure difference deltaF between two ends of the Venturi tube, a temperature T at the throat of the Venturi tube and an absolute pressure F at the throat of the Venturi tube through a first sensor 1, a second sensor 2 and a third sensor 3 respectively, and transmitting the detected delta F, T and F to a control unit 4;
s2: the control unit 4 controls the calculation module 5 to calculate to obtain the air inlet flow in the air inlet manifold; the derivation principle of a calculation formula for calculating the air inlet flow Q by the calculation module 5 is a Venturi differential pressure principle, namely, the flow beam forms local contraction at the throat by means of reducing arrangement in the Venturi tube, so that the flow velocity of gas is increased, the pressure is reduced, the pressure difference can be generated at the front end and the rear end of the throat, and the air inlet flow is measured by measuring the pressure difference; meanwhile, the calculation module 5 can obtain a calculation formula of the intake air flow Q through an algorithm combining a low-pass filtering method and a moving average algorithm; wherein, the calculation formula for calculating the intake air flow Q in the calculation module 5 is：
Wherein, KsIs a constant; epsilon is the gas expansion coefficient; p is the air density of the throat,
r is an ideal gas constant of air, namely the direct factors actually influencing the intake flow Q of the intake manifold only include pressure difference delta F, absolute pressure F and temperature F, and the pressure difference delta F, the absolute pressure F and the temperature F are obtained through measurement, so that the specific numerical value of the intake flow Q can be obtained through calculation according to a calculation formula.
Wherein, in the step S2, the value range of delta F is-0.03 bar ≤ delta F ≤ 0.25bar, the value range of F is 0 ≤ F ≤ 4.5bar, and the value range of T is-40 ℃ ≤ T ≤ 170 ℃; k in step S2sHas a value range of 0 < Ks≤3600。
The specific calculation steps of the method for calculating the intake air flow of the diesel engine in the embodiment are as follows: firstly, the first sensor 1, the second sensor 2 and the third sensor 3 are all in an adjusting mode, and working parameters of the first sensor 1, the second sensor 2 and the third sensor 3 are adjusted according to the type of an intake manifold of a diesel engine to be tested so as to enable the working parameters to be matched with the type of the intake manifold.
Then, making the first sensor 1 detect the pressure difference Δ F between the two ends of the venturi tube, making the second sensor 2 detect the temperature T at the throat of the venturi tube, and making the third sensor 3 detect the absolute pressure F at the throat of the venturi tube; respectively transmitting the detected pressure difference delta F, temperature T and absolute pressure F to the control unit 4, transmitting the pressure difference delta F, temperature T and absolute pressure F to the calculation module 5 after the control unit 4 receives the pressure difference delta F, temperature T and absolute pressure F, and controlling the calculation module 5 to carry out numerical calculation on the intake air flow Q according to a calculation formula by the control unit 4; wherein, the calculating module 5 filters irrelevant signals in the detection value before calculating the intake air flow through an algorithm combining a low-pass filtering method and a moving average algorithm on the basis of the Venturi differential pressure principle, so that the meter can be derivedCalculating a formula for calculating Q;
wherein, KsIs a constant; epsilon is the gas expansion coefficient; p is the air density of the throat,
r is the ideal gas constant for air. The pressure difference Δ F, the absolute pressure F, and the temperature F are respectively substituted into the calculation formulas to be able to calculate the final accurate values of the intake air flow Q.
And finally, the calculation module 5 transmits the calculated accurate value of the intake flow Q to the CAN communication module 6, the CAN communication module 6 receives the accurate value of the intake flow Q and transmits the accurate value to the main controller 7 of the diesel engine, and the main controller 7 CAN set other working parameters of the diesel engine matched with the intake flow Q according to the intake flow Q, so that the use performance of the diesel engine is better, the emission is optimized, and the calculation process of the whole intake flow Q is completed.
The above description is only a preferred embodiment of the present invention, and for those skilled in the art, the present invention should not be limited by the description of the present invention, which should be interpreted as a limitation.
Claims (10)
1. A diesel engine intake air flow measuring device, characterized by comprising:
the Venturi tube is arranged at the air inlet end of an air inlet manifold of the diesel engine, and the diameter of the Venturi tube is variable;
a first sensor (1) for detecting a pressure difference Δ F between the two ends of the venturi tube;
the second sensor (2) is used for detecting the temperature T at the throat of the Venturi tube, and the throat is the position with the minimum inner diameter of the Venturi tube;
-a third sensor (3) for detecting an absolute pressure F at the throat of the venturi;
a calculation module (5) capable of calculating an intake air flow rate Q in the intake manifold according to a calculation formula preset in the calculation module (5);
the control unit (4) is in signal connection with the first sensor (1), the second sensor (2) and the third sensor (3) respectively, the control unit (4) is in control connection with the calculation module (5), and the control unit (4) is used for receiving detection signals of the first sensor (1), the second sensor (2) and the third sensor (3) so as to transmit the detection signals to and control the calculation module (5) to calculate the intake air flow Q in the intake manifold.
2. The diesel intake flow measurement device according to claim 1, further comprising:
the CAN communication module (6) is in communication connection with the calculation module (5) and a main controller (7) of the diesel engine respectively, and the CAN communication module (6) is used for transmitting the air intake flow in the air intake manifold calculated by the calculation module (5) to the main controller (7).
3. The diesel engine intake air flow measurement device of claim 2, wherein the communication protocol adopted by the CAN communication module (6) is J1939 protocol.
4. The diesel engine intake air flow rate measurement device according to claim 1, wherein the calculation formula in the calculation module (5) is derived by a low-pass filtering method in combination with a moving average algorithm.
5. The diesel intake air flow measurement device of claim 1, characterized in that the first sensor (1), the second sensor (2), and the third sensor (3) are each provided with an operation mode and an adjustment mode for adjusting an operation parameter of the first sensor (1), the second sensor (2), and the third sensor (3).
6. The diesel engine intake air flow measurement device of claim 1, wherein the venturi tube further comprises a circular tube section with a constant diameter, a contraction section with a gradually decreasing diameter, and a diffusion section with a gradually increasing diameter in the intake direction, the diffusion section is communicated with the intake end of the intake manifold, the throat is located between the contraction section and the diffusion section, and the diameter of the throat is constant.
7. The diesel engine intake air flow rate measurement device according to claim 1, wherein the second sensor (2) is a negative temperature coefficient thermistor.
8. A method for calculating an intake air flow rate of a diesel engine, using the device for measuring an intake air flow rate of a diesel engine according to any one of claims 1 to 7, comprising the steps of:
s1: measuring a pressure difference Δ F between the two ends of the venturi, a temperature T at the throat of the venturi and an absolute pressure F at the throat of the venturi by means of the first sensor (1), the second sensor (2) and the third sensor (3), respectively, and transmitting the detected Δ F, T and F to the control unit (4);
s2: the control unit (4) controls the calculation module (5) to perform calculation to obtain an intake air flow rate Q in the intake manifold, and the intake air flow rate Q is calculated according to the calculation formula:
epsilon is the gas expansion coefficient; p is the air density of the throat,
r is the ideal gas constant for air.
9. The method for calculating an intake air flow rate of a diesel engine according to claim 8, wherein Δ F in step S2 is in the range of-0.03 bar ≤ Δ F ≤ 0.25bar, F is in the range of 0 < F ≤ 4.5bar, and T is in the range of-40 ℃ ≤ T ≤ 170 ℃.
10. The method of calculating an intake air flow rate of a diesel engine as set forth in claim 8, wherein K in step S2sHas a value range of 0 < Ks≤3600。
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| CN106482795A (en) * | 2016-12-28 | 2017-03-08 | 河北大学 | A kind of inside and outside pipe type flowmeter and flow rate testing methods |
| CN206959919U (en) * | 2017-05-11 | 2018-02-02 | 梁森 | A kind of channel Pitot tube and Venturi tube differential pressure shunting flowmeter and irrigation canal |
| CN209570222U (en) * | 2019-03-28 | 2019-11-01 | 潍柴动力股份有限公司 | A kind of gas flow surveying instrument |
| CN110514257A (en) * | 2019-08-29 | 2019-11-29 | 西安交通大学 | A kind of low liquid holdup moisture two-phase flowmeter device and method based on venturi |
| CN110849428A (en) * | 2019-11-27 | 2020-02-28 | 中国航空工业集团公司沈阳飞机设计研究所 | Cabin current-limiting and flow testing combined device for airplane |
| CN211401318U (en) * | 2019-12-09 | 2020-09-01 | 江阴市神州测控设备有限公司 | Pressure-taking type inner Venturi tube differential pressure flow sensor |
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