CN215804870U - Flow rate measurement device, EGR system, and vehicle - Google Patents
Flow rate measurement device, EGR system, and vehicle Download PDFInfo
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- CN215804870U CN215804870U CN202121989571.4U CN202121989571U CN215804870U CN 215804870 U CN215804870 U CN 215804870U CN 202121989571 U CN202121989571 U CN 202121989571U CN 215804870 U CN215804870 U CN 215804870U
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Abstract
The utility model discloses a flow measuring device, an EGR system and a vehicle, wherein the flow measuring device comprises: a connecting pipe; a gas barrier device disposed in the connecting pipe, the gas barrier device being penetrated by an internal pressure difference forming chamber extending in an axial direction of the connecting pipe, a sectional area of a first end of the internal pressure difference forming chamber being larger than a sectional area of a second end of the internal pressure difference forming chamber; and a differential pressure sensor that measures a pressure at a first end of the internal pressure difference formation chamber and a pressure at a second end of the internal pressure difference formation chamber, respectively. The flow measuring device provided by the embodiment of the utility model can realize high-temperature detection, obtain an accurate detection result and further realize accurate closed-loop control of the EGR rate, thereby ensuring the working efficiency of an engine.
Description
Technical Field
The utility model relates to the technical field of vehicles, in particular to a flow measuring device, an EGR system and a vehicle.
Background
NO for gasoline and diesel vehicles in the emission regulations of vehiclesXThe emissions always show a tightening trend. Wherein, the EuroIII emission standard is that the EGR rate is less than 10 percent; the Europe IV emission standard is that the EGR rate is 10-20%; the Euro V emission standard is that the EGR rate is 20-30 percent; national VI or European VI emission standard is EGR rate is more than 20%, the current emission standard which needs to be met by gasoline/diesel vehicle models in 2020 is national VI/European VI, according to the control of NOXTrends in emission levels may require EGR rates > 30% in the future. Reduction of NO by EGR (Exhaust Gas recirculation) technology is commonly used in the industryXThe original emission is the original emission of the engine combustion chamber outlet. In the prior art, an EGR device is adopted to reduce NOXWhen the exhaust is originally discharged, the air flow meter is arranged to monitor the air inflow of the EGR device, and then the EGR rate is calculated.
In the related art, because the internal exhaust temperature of the EGR device is high when the EGR device works, even can reach 500-600 ℃, the air intake of the EGR device cannot be accurately monitored by adopting an air flow meter, so that the accurate EGR rate cannot be obtained, the accurate closed-loop control of the EGR rate cannot be realized, and when the deviation of the EGR rate is large, the combustion of an engine can be influenced.
SUMMERY OF THE UTILITY MODEL
The present invention is directed to solving at least one of the problems of the prior art. Therefore, a first object of the present invention is to provide a flow rate measuring device, which can realize high temperature detection and obtain accurate detection results, and further realize accurate closed-loop control of the EGR rate, thereby ensuring the working efficiency of the engine.
A second object of the utility model is to propose an EGR system.
A third object of the utility model is to propose a vehicle.
In order to achieve the above object, an embodiment of the first aspect of the present invention provides a flow rate measurement device, including: a connecting pipe; a gas block device provided in the connection pipe, the gas block device being penetrated by an internal pressure difference forming chamber extending in an axial direction of the connection pipe, a sectional area of a first end of the internal pressure difference forming chamber being larger than a sectional area of a second end of the internal pressure difference forming chamber; a differential pressure sensor that measures a pressure of a first end of the internal differential pressure forming chamber and a pressure of a second end of the internal differential pressure forming chamber, respectively.
According to the flow rate measuring device of the present invention, the air resistor is provided in the connecting pipe, and the internal pressure difference forming chamber is formed in the connecting pipe, and the sectional area of the first end of the internal pressure difference forming chamber is larger than the sectional area of the second end of the internal pressure difference forming chamber, and the air resistor exerts a blocking effect on the gas flowing through the pipe to generate the air pressure difference between both ends of the internal pressure difference forming chamber. The pressure difference sensor is arranged on the connecting pipe, the pressure of the first end of the internal pressure difference forming cavity and the pressure of the second end of the internal pressure difference forming cavity can be directly detected, the air pressure difference at the two ends can be obtained, the detection result is accurate and can adapt to a high-temperature environment, and reliable hardware guarantee is provided for further realizing accurate closed-loop control of the EGR rate, so that the working efficiency of the engine is guaranteed.
In some embodiments of the present invention, the internal pressure difference forming chamber includes a constricted section, a throat portion and an equal diameter section, the throat portion being located between a first end of the internal pressure difference forming chamber and a second end of the internal pressure difference forming chamber, a diameter of the throat portion being equal to a diameter of the second end of the internal pressure difference forming chamber, an equal diameter region between the second end of the internal pressure difference forming chamber and the throat portion forming the equal diameter section, a tapered region between the first end of the internal pressure difference forming chamber and the throat portion forming the constricted section.
In some embodiments of the utility model, the diameter D2 of the second end of the internal pressure differential forming chamber is: 7/12D1 is not less than D2 not less than 9/12D1, and D1 is the diameter of the first end of the internal pressure difference forming cavity.
In some embodiments of the present invention, the axial length a of the constriction section is: 7/12D 1A is not less than 9/12D1, and the axial length B of the equal diameter section takes the value as follows: 3/12D 1B 5/12D1 and A + B D1, wherein D1 is the diameter of the first end of the internal pressure difference forming cavity.
In some embodiments of the present invention, a first end of the air lock device is close to the first end of the internal pressure difference forming chamber, and an outer wall of the first end of the air lock device is hermetically connected with an inner wall of the connecting pipe.
In some embodiments of the utility model, the position of the gas resistance device, which is in contact with the gas in the connecting pipe, is provided with a carbon deposition prevention layer.
In some embodiments of the utility model, the anti-carbon deposition layer is a nickel coating.
In some embodiments of the present invention, the differential pressure sensor has two pressure ports, and each of the two pressure ports communicates with the inside of the connection pipe through a gas extraction pipe, wherein one of the gas extraction pipes corresponds to a first end of the internal pressure difference forming chamber, and the other gas extraction pipe corresponds to a second end of the internal pressure difference forming chamber.
In order to achieve the above object, an EGR system according to an embodiment of a second aspect of the present invention includes: an EGR tube; a cooler disposed on the EGR tube, an EGR valve disposed on the EGR tube; the flow rate measurement device according to any one of the above embodiments, which is provided on the EGR pipe, and the first end of the internal pressure difference formation chamber is close to the EGR valve.
According to the EGR system proposed by the embodiment of the utility model, the EGR system is used for introducing part of the exhaust gas into the combustion chamber of the engine body to suppress NOXAnd (4) discharging. All set up cooler, EGR valve and flow measuring device on the EGR pipe to detect EGR system's gas flow, and flow measuring device is high temperature resistant subassembly, can adapt to the temperature environment of EGR system during operation, realize the real-time supervision to EGR system state, also provide reliable hardware guarantee for the accurate closed-loop control that further realizes the EGR rate.
In order to achieve the above object, a vehicle according to an embodiment of a third aspect of the present invention includes: the engine comprises an engine body and an air inlet and exhaust assembly connected with the engine body; the EGR system according to the embodiment of the second aspect, wherein the EGR system is connected to the intake and exhaust assembly, and is configured to introduce a part of exhaust gas into a combustion chamber of the engine body, and output a gas pressure difference detection signal at an outlet of the EGR system; and the engine controller is used for obtaining the gas flow of the EGR system according to the air pressure difference detection signal and obtaining the EGR rate according to the gas flow.
The vehicle provided by the embodiment of the utility modelEGR system for introducing part of exhaust gas into combustion chamber of engine body to suppress NOXAnd (4) discharging. Through set up flow measuring device in the EGR system, flow measuring device is high temperature resistant subassembly, can acquire the pressure difference detected signal at connecting pipe both ends in real time, and engine controller obtains the gas flow of EGR system according to the pressure difference detected signal to and acquire the EGR rate according to the gas flow of EGR system, thereby realize the accurate detection to the EGR rate, and then can control the operating condition of engine body and each part. The EGR system is guaranteed to be capable of achieving high-temperature monitoring and suitable for various vehicles.
Additional aspects and advantages of the utility model will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the utility model.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic view of a flow measurement device according to one embodiment of the present invention;
FIG. 2 is a schematic view of a flow measurement device according to another embodiment of the present invention;
FIG. 3 is a block diagram of an EGR system according to an embodiment of the present invention;
FIG. 4 is a schematic illustration of a vehicle according to one embodiment of the present invention;
FIG. 5 is a schematic illustration of a vehicle according to another embodiment of the present invention;
FIG. 6 is a block diagram of a vehicle according to one embodiment of the present invention;
fig. 7 is a block diagram of a vehicle according to another embodiment of the utility model.
Reference numerals:
a vehicle 1000;
an EGR system 100, an engine body 200, an intake/exhaust assembly 300, an engine controller 400, and a presentation device 500;
flow rate measuring device 10, cooler 20, EGR valve 30, EGR pipe 40;
the air resistance device 1, the differential pressure sensor 2 and the connecting pipe 3;
an engine body 200, an engine controller 400, an intake and exhaust assembly 300;
the engine comprises a contraction section M, a throat V, an equal-diameter section P, a supercharger Q, an engine intake manifold 301, an engine exhaust manifold 302, a throttle valve 303, a turbine 304, an intermediate shaft 305, a compressor 306, an intercooler 307, a DOC/LNT 308, a DPF/SDPF309, an SCR310, an air flow meter 311 and an air filter 312.
Detailed Description
Embodiments of the present invention will be described in detail below, the embodiments described with reference to the drawings being illustrative, and the embodiments of the present invention will be described in detail below.
A flow rate measurement device 10 according to an embodiment of the present invention is described below with reference to fig. 1-2.
In some embodiments of the present invention, as shown in fig. 1, a schematic diagram of a flow measuring device according to an embodiment of the present invention is shown, wherein the flow measuring device 10 includes a gas blocking device 1, a differential pressure sensor 2, and a connection pipe 3.
The air resistance device 1 is provided in the connecting pipe 3, and the air resistance device 1 is penetrated by an internal pressure difference forming chamber extending in the axial direction of the connecting pipe 3, and the cross-sectional area of a first end of the internal pressure difference forming chamber is larger than that of a second end of the internal pressure difference forming chamber. As shown in fig. 1, the direction of the arrow indicates the axial extension direction of the connection pipe 3, the end of the internal pressure difference forming chamber near the a position is the first end, the end near the b position is the second end, and the cross-sectional areas of the two ends of the internal pressure difference forming chamber are different, so that when gas passes through the gas barrier device 1, the gas pressure difference exists between the two ends of the internal pressure difference forming chamber.
Specifically, the first end of the air resistance device 1 is close to the first end of the internal pressure difference forming cavity, the outer wall of the first end of the air resistance device 1 is connected with the inner wall of the connecting pipe 3 in a sealing manner, and the connecting manner can be welding. The diameter of the first end of the internal pressure difference forming cavity can be equal to the diameter of the inner wall of the connecting pipe 3, the air resistance device 1 can be matched with the inner wall of the connecting pipe 3 when being arranged inside the connecting pipe 3 and is easy to weld, gas is guaranteed not to influence the gas pressure before flowing into the internal pressure difference forming cavity, and the gas pressure difference is only generated when the gas flows through the internal pressure difference forming cavity. The cross-sectional area of the first end of the internal pressure difference forming chamber is larger than the cross-sectional area of the second end of the internal pressure difference forming chamber. I.e., the cross-sectional areas at both ends of the internal pressure difference forming chamber are different, the gas resistance device 1 has a blocking effect on the gas in the piping, and the gas pressure at the first end of the internal pressure difference forming chamber is larger than the gas pressure at the second end of the internal pressure difference forming chamber. The gas blocking device 1 may be made of a high temperature resistant substance to accommodate the operating temperature of the EGR system 100.
The differential pressure sensor 2 is arranged on the connecting pipe 3, and the differential pressure sensor 2 can be used for respectively measuring the pressure of the first end of the internal pressure difference forming cavity and the pressure of the second end of the internal pressure difference forming cavity, so that the relatively accurate air pressure difference can be obtained according to the obtained pressures of the two ends of the internal pressure difference forming cavity. And the differential pressure sensor 2 is arranged on the connecting pipe 3, is less influenced by the temperature in the pipe, and can realize the real-time monitoring of the air pressure difference.
Specifically, in some embodiments, as shown in fig. 1, the differential pressure sensor 2 has two pressure ports each communicating with the inside of the connection pipe 3 through one gas extraction pipe, one of which corresponds to a first end of the internal pressure difference forming chamber and the other of which corresponds to a second end of the internal pressure difference forming chamber. The gas detected by one gas taking pipe is the gas at the position a, so that the pressure of the first end of the internal pressure difference forming cavity is obtained. The gas detected by the other gas taking pipe is the gas at the position b, so that the pressure of the second end of the internal pressure difference forming cavity is obtained. The differential pressure sensor 2 can further obtain a relatively accurate air pressure difference according to the obtained pressure at the two ends of the internal pressure difference forming cavity.
According to the flow rate measuring device 10 of the present invention, the gas barrier device 1 is disposed in the connection pipe 3, and an internal pressure difference formation chamber is formed in the connection pipe 3, and a sectional area of a first end of the internal pressure difference formation chamber is larger than a sectional area of a second end of the internal pressure difference formation chamber, and the gas barrier device 1 exerts a blocking effect on the gas flowing through the pipe to generate a gas pressure difference at both ends of the internal pressure difference formation chamber. Differential pressure sensor 2 sets up on connecting pipe 3, can directly detect the pressure of the first end that the interior pressure difference formed the chamber and the pressure that the interior pressure difference formed the second end in chamber, and then can acquire the pressure differential at both ends, and the testing result is comparatively accurate and can adapt to high temperature environment, also provides reliable hardware guarantee for the accurate closed-loop control that further realizes the EGR rate to guarantee the work efficiency of engine.
In some embodiments of the present invention, as shown in fig. 1, the internal pressure difference forming chamber includes a constricted section M, a throat portion V and an equal diameter section P, the throat portion V being located between a first end of the internal pressure difference forming chamber and a second end of the internal pressure difference forming chamber, the diameter of the throat portion V being equal to the diameter of the second end of the internal pressure difference forming chamber, an equal diameter region between the second end of the internal pressure difference forming chamber and the throat portion V forming the equal diameter section P, and a tapered region between the first end of the internal pressure difference forming chamber and the throat portion V forming the constricted section M.
For example, as shown in fig. 1, one end of the internal pressure difference forming chamber near the position a is a first end of the constricted section M, and one end of the internal pressure difference forming chamber near the position b is a second end of the constant diameter section P, that is, a second end of the internal pressure difference forming chamber. The first end of the contraction section M is connected with the inner wall of the connecting pipe 3 in a sealing mode, the second end of the contraction section M and the first end of the equal-diameter section P are provided with throats V, the diameter of the first end of the contraction section M is larger than that of the second end of the contraction section M, and the diameter of the second end of the contraction section M is equal to that of the first end of the equal-diameter section P.
Specifically, the shape of the inner wall of the contraction section M is defined to be similar to a circular truncated cone, the shape of the inner wall of the constant diameter section P is similar to a cylinder, the contraction section M and the constant diameter section P can be of an integrally formed structure, and the contraction section M and the constant diameter section P can also be welded in combination to form the air resistance device 1.
In some embodiments of the present invention, as shown in FIG. 2, a schematic view of a flow rate measurement device according to another embodiment of the present invention is shown, wherein D1 is the diameter of the first end of the internal pressure difference forming chamber, i.e., the diameter of the first end of the constricted section M, D2 is the diameter of the second end of the internal pressure difference forming chamber, i.e., the diameter of the second end of the constant diameter section P, and the diameter D2 of the second end of the internal pressure difference forming chamber has a value of 7/12D1 ≦ D2 ≦ 9/12D 1. For example, the diameter D2 of the second end of the inner pressure differential forming chamber may be set to a value approximately equal to 2/3D 1.
In the embodiment, the gas enters the internal pressure difference forming chamber from the first end of the contraction section M and flows out from the second end of the equal-diameter section P, the gas pressure difference exists between the position a and the position b because the diameter D1 of the first end of the internal pressure difference forming chamber is larger than the diameter D2 of the second end of the internal pressure difference forming chamber, namely the cross-sectional areas of the two ends of the internal pressure difference forming chamber are different, and the gas pressure at the position a is larger than that at the position b because the gas blocking device 1 has a blocking effect on the gas in the pipeline.
In other embodiments of the present invention, A is the axial length of the constriction M and B is the axial length of the constant diameter section P. The axial length A of the contraction section M is 7/12D 1-9/12D 1, the axial length B of the constant diameter section P is 3/12D 1-5/12D 1, A + B-D1, and D1 is the diameter of the first end of the internal pressure difference forming cavity.
Specifically, the axial length a of the constricted section M may be set to a value equal to about 2/3D1, and the axial length B of the constant diameter section P may be set to a value equal to about 1/3D 1. Since A + B is not more than D1, the size of the internal pressure difference forming cavity is shorter, and the method has advantages in hardware arrangement of products.
During the flowing process of the gas in the pipeline, the temperature is high, Hydrocarbon (HC) in the gas is easy to be thermally cracked, and after the Hydrocarbon (HC) is thermally cracked, the graphitized carbon (C) is aggregated and nucleated, so that carbon deposition is formed.
In some embodiments of the present invention, the contact surface of the internal pressure difference formation chamber and the gas in the connection pipe 3 is provided with a carbon deposition prevention layer to prevent the formation of "carbon deposition". Wherein, the carbon deposition prevention layer is a nickel coating, and the thickness of the coating can be set to be 0.2-20 μm. The nickel coating is resistant to high temperatures, and helps carbon (C) and ambient oxygen such as (O or O) when Hydrocarbons (HC) thermally crack into carbon (C) and hydrogen (H)2) Combine to form carbon monoxide (CO) or carbon dioxide (CO)2) Thereby achieving the purpose of preventing carbon deposition.
An EGR system according to an embodiment of the present invention is described below with reference to fig. 3 to 5.
In some embodiments of the present invention, an EGR system 100 is further proposed, as shown in fig. 3, which is a block diagram of an EGR system according to an embodiment of the present invention, wherein the EGR system 100 comprises a cooler 20 and an EGR valve 30, an EGR pipe 40, and the flow measurement device 10 of any one of the above embodiments.
Wherein the cooler 20 is provided on the EGR pipe 40, wherein the cooler 20 is provided with an air inlet and an air outlet, the EGR valve 30 is provided on the EGR pipe 40, and the EGR valve 30 may be provided at the air inlet or at the air outlet of the cooler 20. (not shown in fig. 3) specifically, the cooler 20 and the EGR valve 30 work together to reintroduce a part of the exhaust gas discharged from the engine block 200 into the combustion chamber in the engine block 200, and can lower the maximum temperature of combustion, thereby suppressing NOXAnd (5) discharging. The EGR system 100 may be classified into high pressure EGR and low pressure EGR according to the setting position, and specifically, the setting positions of the cooler 20, the EGR valve 30, and the flow measurement device 10 according to the embodiment of the present invention may be described with reference to fig. 4 and/or fig. 5. The EGR system 100 shown in fig. 4 is high pressure EGR, the EGR system 100 is disposed between the supercharger 305 and the engine intake manifold 301, and the gas entering the EGR system 100 is supercharged gas. The EGR system 100 shown in fig. 5 is low pressure EGR, and the EGR system 100 is disposed between the supercharger 305 and the air inlet of the intake pipe, i.e., one end of the EGR system 100 is connected to the engine exhaust manifold 302, and the other end of the EGR system 100 is connected to the supercharger 305 and the air cleaner 312, so that the gas entering the EGR system 100 is not supercharged by the supercharger 305.
In an exemplary embodiment, flow measuring device 10 is disposed on EGR duct 40, and flow measuring device 10 may be connected to an outlet of cooler 20 (not shown in fig. 3), for example. For example, the EGR valve 30 shown in fig. 4 is provided at the air outlet, and the flow rate measurement device 10 is connected to the air outlet, near the EGR valve 30. As another example, an EGR valve 30 shown in fig. 5 is provided at the air intake, and a flow rate measurement device 10 is connected to the air outlet, near the cooler 20.
According to the EGR system 100 proposed by the embodiment of the present invention, the EGR system 100 is used to introduce part of the exhaust gas into the combustion chamber of the engine body 200 to suppress NOXAnd (4) discharging. The cooler 20, the EGR valve 30, and the flow rate measurement device 10 are all provided on the EGR pipe 40 to detect the gas flow rate of the EGR system 100, andand the flow measuring device 10 is a high temperature resistant component, and can adapt to the temperature environment of the EGR system 100 during operation, so as to realize real-time monitoring of the state of the EGR system 100, and provide reliable hardware guarantee for further realizing accurate closed-loop control of the EGR rate, thereby ensuring the working efficiency of the engine.
In some embodiments of the present invention, the EGR system 100 includes the gas barrier device 1, and as can be seen from fig. 2, 4 and/or 5, the gas barrier device 1 defines an internal pressure difference forming chamber, a first end of the internal pressure difference forming chamber, i.e., an end near the position a, is close to the air outlet port of the cooler 20, and a second end of the internal pressure difference forming chamber, i.e., an end near the position b, is far from the air outlet port of the cooler 20. After the gas flows through the EGR system 100, the gas flows into the gas barrier device 2 from the first end of the internal pressure difference forming chamber and flows out of the gas barrier device 1 from the second end of the internal pressure difference forming chamber, and due to the fact that the cross-sectional areas of the two ends of the internal pressure difference forming chamber are different, a gas pressure difference is formed between the two ends of the internal pressure difference forming chamber, the pressure difference sensor 2 can detect the pressure of the first end of the internal pressure difference forming chamber and the pressure of the second end of the internal pressure difference forming chamber, further obtain the gas pressure difference between the two ends of the internal pressure difference forming chamber, and obtain an internal pressure difference detection signal according to the detected gas pressure difference.
In some embodiments of the present invention, as shown in fig. 6, a block diagram of a vehicle according to an embodiment of the present invention is shown, wherein the vehicle 1000 comprises an engine body 200, an intake and exhaust assembly 300 and the EGR system 100 of the above second aspect embodiment and an engine controller 400.
A vehicle 1000 according to an embodiment of the present invention will be described with reference to fig. 4 and 5. Fig. 4 is a schematic view of a vehicle according to one embodiment of the present invention, and fig. 5 is a schematic view of a vehicle according to another embodiment of the present invention.
Specifically, the intake and exhaust assembly 300 is connected with the engine block 200. The intake and exhaust assembly 300 includes an engine intake manifold 301, an engine exhaust manifold 302, a throttle 303, a supercharger Q (including a turbine 304, an intermediate shaft 305, and a compressor 306), an intercooler 307, a DOC (Oxidation Catalyst)/LNT (lean NO)Xtrap, lean NOXTrap) 308, DPF (Diesel Particulate Filter/SDPF (Diesel Particulate Filter with SCR Function) 309, SCR (Selective Catalytic Reduction) 310, air flow meter 311, and air cleaner 312.
The EGR system 100 is connected to the intake and exhaust assembly 300, and is configured to introduce a part of exhaust gas into the combustion chamber of the engine body 200 and output a pressure difference detection signal at an air outlet of the EGR system 100. Wherein the EGR system 100 includes the flow rate measuring device 10, the flow rate measuring device 10 is disposed at the outlet of the cooler 20, a part of the exhaust gas discharged from the engine body 200 is reintroduced into the combustion chamber in the engine body 200 by the EGR system 100, the maximum temperature of combustion can be reduced, and NO can be suppressedXAnd (5) discharging. The gas flows through the EGR system 100 on the premise that the gas pressure before the turbine 304 is greater than the gas pressure after the intercooler 307.
The engine controller 400 is further configured to obtain a gas flow rate of the EGR system 100 according to the gas pressure difference detection signal, and obtain an EGR rate according to the gas flow rate.
The engine controller 400 is connected to the flow rate measurement device 10, and the differential pressure sensor 2 acquires an air pressure difference detection signal and then sends the air pressure difference detection signal to the engine controller 400. The engine controller 400 may be an MCU (micro controller Unit) or a VCU (Vehicle Control Unit), and may perform analysis and calculation according to the obtained air pressure difference detection signal to obtain a corresponding air flow rate.
Specifically, there is a corresponding relationship between the pressure difference and the gas flow, and when the gas density affects the corresponding relationship between the pressure difference and the gas flow, an experiment is performed by calibrating the MAP to obtain the gas flow under different pressure difference conditions. For example, by calibrating the air pressure difference MAP based on the position b in fig. 2, the gas flow rates at different pressures at the position b and the position a can be obtained. As shown in table 1, a relationship table of gas pressure difference and gas flow rate according to an embodiment of the present invention is shown, wherein the range of the gas pressure at the position b is, for example, but not limited to, 1.0bar to 3.3bar, under which the gas flow rates corresponding to the gas pressures at the positions a that are different are respectively obtained, and the gas pressure at the position a is at least 0.2bar higher than the gas pressure at the position b. For example, the gas pressure at the position b is 1.0bar, the corresponding gas flow rates at the positions a of 1.2bar, 1.3bar, 1.4bar and 1.5bar … … can be respectively obtained and recorded, and for example, the gas pressure at the position b is 1.1bar, the corresponding gas flow rates at the positions a of 1.3bar, 1.4bar, 1.5bar and 1.6bar … … can be respectively obtained and recorded, and for example, the gas pressure at the position b is 3.3bar, and the corresponding gas flow rates at the positions a of 3.5bar, 3.6bar, 3.7bar and 3.8bar … … can be respectively obtained and recorded. The calibrated data may be stored in the engine controller 400 in advance, and when the gas flow rate is obtained, a table may be looked up according to the gas pressures at the position b and the position a to obtain the corresponding gas flow rate.
TABLE 1
More specifically, the EGR rate is a ratio of the amount of gas re-entering the engine body 200 to the total amount of gas entering the engine body 200. As shown in equation (1-1), the amount of gas re-entering the engine body 200 is equal to the volume flow of air taken in when the EGR system 100 is not provided minus the volume flow of air taken in when the EGR system 100 is provided, and the total amount of gas entering the engine body 200 is equal to the volume flow of air taken in when the EGR system 100 is not provided. The engine controller 400 is further configured to obtain the EGR rate according to the gas flow rate of the EGR system 100, and after the engine controller 400 obtains the gas flow rate of the EGR system 100, a calculation may be performed according to the gas flow rate to obtain the EGR rate.
According to the proposed vehicle 1000 of the embodiment of the utility model, the EGR system 100 is used to introduce part of the exhaust gas into the combustion chamber of the engine body 200 to suppress NOXAnd (4) discharging. By providing the flow rate measurement device 10 in the EGR system 100, and the flow rate measurement device 10 is a high temperature resistant component, the air pressure difference detection signal of the connection pipe 3 can be obtained in real time, the engine controller 400 obtains the gas flow rate of the EGR system 100 according to the detected air pressure difference detection signal, and obtains the EGR rate according to the gas flow rate of the EGR system 100, thereby realizing accurate detection of the EGR rate, and further controlling the operating states of the engine body 200 and each component. It is ensured that the EGR system 100 can achieve high temperature monitoring and is applicable to various vehicles 1000.
In some embodiments of the present invention, as shown in fig. 7, which is a block diagram of a vehicle according to another embodiment of the present invention, the vehicle 1000 further includes a prompting device 500, and the prompting device 500 is connected with the engine controller 400 for prompting when the EGR rate is abnormal.
Specifically, the presentation device 500 may be a display screen or the like in the vehicle 1000, and may perform a trouble code or text presentation when it is determined that the EGR rate is abnormal. For example, when the inside of the EGR system 100 is clogged with soot, the EGR flow capacity may be decreased, and further, the fuel consumption may be increased, the EGR performance may be decreased, and may not be immediately perceived by the driver. The engine controller 400 controls the prompting device 500 to prompt the driver to check or repair the EGR rate too low, thereby ensuring that the performance of the vehicle 1000 is always optimal.
Other configurations and operations of the vehicle 1000 according to embodiments of the present invention are known to those of ordinary skill in the art and will not be described in detail herein.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.
While embodiments of the utility model have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the utility model, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. A flow measuring device, comprising:
a connecting pipe;
a gas block device provided in the connection pipe, the gas block device being penetrated by an internal pressure difference forming chamber extending in an axial direction of the connection pipe, a sectional area of a first end of the internal pressure difference forming chamber being larger than a sectional area of a second end of the internal pressure difference forming chamber;
a differential pressure sensor that measures a pressure of a first end of the internal differential pressure forming chamber and a pressure of a second end of the internal differential pressure forming chamber, respectively.
2. The flow rate measurement device according to claim 1, wherein the internal pressure difference formation chamber includes a constricted section, a throat portion and an equal-diameter section, the throat portion being located between a first end of the internal pressure difference formation chamber and a second end of the internal pressure difference formation chamber, a diameter of the throat portion being equal to a diameter of the second end of the internal pressure difference formation chamber, an equal-diameter region between the second end of the internal pressure difference formation chamber and the throat portion forming the equal-diameter section, a tapered region between the first end of the internal pressure difference formation chamber and the throat portion forming the constricted section.
3. A flow measuring device according to claim 2, characterized in that the diameter D2 of the second end of the inner pressure difference forming chamber has the value: 7/12D1 is not less than D2 not less than 9/12D1, and D1 is the diameter of the first end of the internal pressure difference forming cavity.
4. A flow measuring device according to claim 2, characterized in that the axial length a of the constriction is given by the value: 7/12D 1A is not less than 9/12D1, and the axial length B of the equal diameter section takes the value as follows: 3/12D 1B 5/12D1 and A + B D1, wherein D1 is the diameter of the first end of the internal pressure difference forming cavity.
5. The flow measuring device of claim 1, wherein the first end of the air-resistor is proximate to the first end of the internal differential pressure forming chamber, and wherein an outer wall of the first end of the air-resistor is sealingly coupled to an inner wall of the connecting tube.
6. The flow measuring device of claim 1, wherein the gas barrier is provided with a carbon deposition prevention layer at a position in contact with the gas in the connecting pipe.
7. The flow measuring device of claim 6, wherein the anti-carbon deposition layer is a nickel coating.
8. The flow rate measurement device according to claim 1, wherein the differential pressure sensor has two pressure ports each communicating with an inside of the connection pipe through one of the gas take-off pipes, one of the gas take-off pipes corresponding to a first end of the internal pressure difference formation chamber, and the other gas take-off pipe corresponding to a second end of the internal pressure difference formation chamber.
9. An EGR system, comprising:
an EGR tube;
a cooler disposed on the EGR tube;
an EGR valve disposed on the EGR tube;
a flow rate measurement device according to any one of claims 1 to 8, which is provided on the EGR pipe, and a first end of the internal pressure difference formation chamber is close to the EGR valve.
10. A vehicle, characterized by comprising:
the engine comprises an engine body and an air inlet and exhaust assembly connected with the engine body;
the EGR system of claim 9, connected to the intake-exhaust assembly, for introducing part of exhaust gas into a combustion chamber of the engine body, and outputting a differential pressure detection signal of the EGR system;
and the engine controller is used for obtaining the gas flow of the EGR system according to the air pressure difference detection signal and obtaining the EGR rate according to the gas flow.
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| CN202121989571.4U CN215804870U (en) | 2021-08-23 | 2021-08-23 | Flow rate measurement device, EGR system, and vehicle |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121989571.4U CN215804870U (en) | 2021-08-23 | 2021-08-23 | Flow rate measurement device, EGR system, and vehicle |
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| CN215804870U true CN215804870U (en) | 2022-02-11 |
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