Device for detecting a physical quantity

Abstract

Device for detecting a physical quantity (30) that detects a physical quantity of a gas (IA) to be measured flowing in a main passage (124), the device for detecting a physical quantity (30) comprising: a measuring section (310) arranged in the main passage (124); a secondary passage (330) provided in the measuring section (310) and configured to extract the gas (IA) to be measured from the main passage (124); a supporting element (603) extending in a center of the passage of the secondary passage (330) across a passage width direction of the secondary passage (330) and dividing a portion of the secondary passage (330) in a direction intersecting the passage width direction into two flow paths on the side of one surface (603a) and on the side of the other surface (603b); and a flow rate detection element (602),which is arranged on a surface (603a) of the supporting component (603) and detects a flow rate of the gas to be measured (IA) in the secondary passage (330), wherein the secondary passage (330) comprises a straight section (321) which is linear and on which the supporting component (603) is arranged, and an outlet-side curved section (322) which is continuous with an outlet side of the straight section (321) and is curved in one direction in the passage width direction of the straight section (321), wherein the straight section (321) is provided with a partition (500, 501, 502) which divides the flow path (332) on the side of the other surface (603b) of the supporting component (603) in the passage width direction into two flow paths on one side and on the other side, and below the two flow paths on one side and on the other side in the passage width direction, which are divided by the partition (500, 501, 502),a cross-sectional area of ​​the flow path (332a) on one side in the direction of the passage width is smaller than a cross-sectional area of ​​the flow path (332b) on the other side in the direction of the passage width, characterized in that the partition (502) contains several rod-shaped components which are arranged next to each other at predetermined intervals in a direction of travel of the straight section (321).

Description

Technical field

[0001] The present disclosure relates to a device for detecting a physical quantity, for example, a physical quantity of intake air in an internal combustion engine. State of the art

[0002] JP 2003-315116 A discloses, for example, a configuration of a device for detecting a physical quantity, in which a measuring section projects from the inner wall of an inlet passage towards the center of the passage, a secondary passage for drawing in a flow is arranged in the measuring section, and a flow rate detection element is arranged spanning the curved secondary passage. In the device for detecting a physical quantity described above, a plate-like component is installed on the inlet side of the detection element to protect it, and the detection element is protected from contaminants flowing into the secondary passage.Since the speed of the flow passing through the detection element decreases at this time, a device for detecting a physical quantity has been proposed which increases the flow velocity by installing a resistance component in a passage divided by a support section of the detection element.

[0003] Furthermore, a device according to the preamble of claim 1 is known from WO 2020 / 003809 A1. Further devices for the detection of a physical quantity are known from JP 2018-205071 A, DE 102 53 691 A1 and DE 11 2012 005 695 T5. Summary of the invention: Technical problem

[0004] Although the JP 2003-315116 A configuration incorporates resistance components in the secondary passage to increase the flow velocity near the detection element, these components are symmetrically installed. This results in only a simple acceleration effect near the detection element and does not account for the flow velocity distribution throughout the entire passage. Consequently, in some cases, the pressure drop in the passage may increase, the flow velocity may decrease, and the flow rate of the gas being measured may decrease. Furthermore, there are concerns that errors may change due to pulsation conditions and that detection accuracy may decrease.

[0005] The present invention was made in light of the above points and one object of the present invention is to create a device for the detection of a physical quantity which is capable of optimizing a flow velocity distribution in a bypass and preventing changes of errors under multiple pulsation conditions. Solution to the problem

[0006] The aforementioned problem is solved by a device according to claim 1.

[0007] A device for detecting a physical quantity is provided, which detects a physical quantity of a gas to be measured flowing in a main passage, wherein the device for detecting a physical quantity comprises: a measuring section arranged in the main passage; a secondary passage provided in the measuring section and configured to extract the gas to be measured from the main passage; a supporting element extending across a passage width direction of the secondary passage at a center point of the passage and dividing a portion of the secondary passage into two flow paths on one side of a surface and on the other side of a surface in a direction that intersects the passage width direction; and a flow rate detection element arranged on a surface of the supporting element and detecting a flow rate of the gas to be measured in the secondary passage.wherein the secondary passage comprises a straight section, which runs linearly and on which the supporting component is arranged, and an outlet-side curved section, which is continuous with an outlet side of the straight section and is curved in one direction in the passage width direction of the straight section, wherein the straight section is provided with a partition that divides the flow path on the side of the other surface of the supporting component in the passage width direction into two flow paths on one side and on the other side, and wherein, among the two flow paths on one side and on the other side in the passage width direction divided by the partition, a cross-sectional area of ​​the flow path on one side in the passage width direction is smaller than a cross-sectional area of ​​the flow path on the other side in the passage width direction. The device according to the invention is characterized in thatthat the partition wall contains several rod-shaped components that are arranged next to each other at predetermined intervals in one direction along the straight section. Advantageous effects of the invention

[0008] According to the present invention, it is possible to optimize the flow velocity distribution in the bypass and to prevent changes in errors under multiple pulsation conditions. Further features relating to the present invention will become apparent from the description of this patent specification and from the accompanying drawings. Other problems, configurations, and effects than those described above are explained by the following description of embodiments. Brief description of the drawings Fig. Figure 1 is a schematic system representation of an embodiment in which a device for detecting a physical quantity according to the present invention is used in an internal combustion engine control system. Fig. Figure 2 is a schematic front view of a structure of a device for detecting a physical quantity according to a first embodiment. Fig. Figure 3 is a cross-sectional view along line QQ in Fig. 2. Fig. Figure 4A is a schematic view of a flow velocity distribution on a section line of a cross-section along the line PP in Fig. 2 and a cross-section along line SS in Fig. 3, if no partition wall is provided. Fig. 4B is a schematic representation to illustrate a pressure state when a gas to be measured is at the pressure shown in Fig. The flow velocity distribution shown in 4A flows into a section curved at the outlet. Fig. 5A is a schematic view of a flow velocity distribution in a secondary passage in a cross-section along the line QQ in Fig. 2 and in a cross-section along line SS in Fig. 3, if a partition wall is provided. Fig. 5B is a schematic representation to illustrate a pressure state when a gas to be measured is pressurized to a pressure of a certain degree. Fig. The flow velocity distribution shown in 5A flows into a section curved at the outlet. Fig. Figure 6 is a schematic front view of a structure of a device for detecting a physical quantity according to a second embodiment. Fig. Figure 7 is a cross-sectional view along line RR in Fig. 6. Fig. Figure 8 is a schematic front view of a structure of a device for detecting a physical quantity according to a third embodiment. Fig. Figure 9 is a schematic front view of a structure of a device for detecting a physical quantity according to a fourth embodiment. Description of embodiments

[0009] An embodiment of the invention described below (hereinafter referred to as embodiments) successfully solves various problems, which is desirable as an actual product, and solves various problems, which is particularly desirable for use as a device for detecting a physical quantity of the intake air of a vehicle, and exhibits various effects. One of the various problems solved by the following embodiments is the content described in the section on the problem to be solved by the invention described above, and one of the various effects achieved by the following embodiments is the effect described in the section on the effect of the invention. In the following description of the embodiments, various problems solved by the following embodiments and various effects achieved by the following embodiments are described.Thus, the problems and effects that are solved by the embodiments described in the following embodiments are also described in different content than the content in the section on problems to be solved by the invention and in the section on the effects of the invention.

[0010] In the following embodiments, the same reference numerals denote the same configuration, even if the figure numbers are different, and the same functions and effects are achieved. For the configuration already described, only reference numerals are given in the drawings, and their descriptions may be omitted.

[0011] Fig. Figure 1 is a schematic system representation of an embodiment in which a device for the detection of a physical quantity according to the present invention is used in an internal combustion engine control system of an electronic fuel injection method.

[0012] Based on the operation of an internal combustion engine 110, which includes an engine cylinder 112 and an engine piston 114, intake air is drawn in by an air cleaner 122 as a gas IA to be measured and directed, for example, via an intake body, which is a main passage 124, a throttle valve 126, and an intake manifold 128 to a combustion chamber of the engine cylinder 112. The physical quantity of the gas IA to be measured, which is the intake air directed to the combustion chamber, is detected by the device 30 for the detection of a physical quantity according to the present invention. Based on the detected physical quantity, fuel is supplied by a fuel injection valve 152, and the fuel and the gas IA to be measured are directed to the combustion chamber in a state of an air-fuel mixture.In the present embodiment, the fuel injection valve 152 is provided in an inlet opening of an internal combustion engine and the fuel injected into the inlet opening, together with the gas IA to be measured, forms an air-fuel mixture, is directed via an inlet valve 116 to the combustion chamber and is burned to generate mechanical energy.

[0013] The fuel and air supplied to the combustion chamber are in a mixed state and are explosively combusted by spark ignition from a spark plug 154 to generate mechanical energy. The combustion gas is directed by an exhaust valve 118 to an exhaust pipe and expelled as exhaust gas EA from the exhaust pipe to the outside of the vehicle. The flow rate of gas IA, which is the intake air supplied to the combustion chamber, is controlled by a throttle valve 132, the opening of which changes based on the application of the accelerator pedal.The amount of fuel supplied is controlled based on the flow rate of the intake air directed to the combustion chamber, and a driver can control the mechanical energy produced by the internal combustion engine by controlling the degree of opening of the throttle valve 132 to control the flow rate of the intake air directed to the combustion chamber.

[0014] The physical quantities, such as the flow rate, temperature, humidity, and pressure of the gas IA to be measured, which is the intake air drawn in by the air purifier 122 and flowing through the main passage 124, are detected by the physical quantity detection device 30. The physical quantity detection device 30 inputs an electrical signal representing the physical quantity of the intake air into the control device 200. Additionally, the control device 200 receives an output from a throttle angle sensor 144, which measures the opening degree of the throttle valve 132, and also receives an output from a rotary angle sensor 146 to measure the positions and states of the engine piston 114, the intake valve 116, and the exhaust valve 118 of the internal combustion engine, as well as the rotational speed of the internal combustion engine.In order to measure the state of the mixture ratio of a combustion quantity and an air quantity from the state of the exhaust gas EA, the output of an oxygen sensor 148 is input into the control device 200.

[0015] The control device 200 calculates a fuel injection quantity and an ignition timing setting based on the physical quantity of the intake air, which is the output of the device 30 for the detection of a physical quantity, and the rotational speed of the internal combustion engine, which is measured based on the output of the rotational angle sensor 146. Based on these calculation results, the quantity of fuel supplied by the fuel injector 152 and the ignition timing setting at which the fuel is ignited by the spark plug 154 are controlled.The fuel supply quantity and ignition timing are finely controlled based on changes in temperature and throttle angle, detected by the device 30 for the detection of a physical quantity, changes in engine speed, and the air-fuel ratio measured by the oxygen sensor 148. Furthermore, the control device 200, via an idle air control valve 156, controls the amount of air bypassing the throttle valve 132 in an idle operating condition of the internal combustion engine and adjusts it according to the engine speed in that idle operating condition.

[0016] Both the fuel quantity and the ignition timing, which are the main control parameters of the internal combustion engine, are calculated using the output of device 30 for the detection of a physical quantity as a primary parameter. Therefore, it is important to improve the detection accuracy of device 30 for the detection of a physical quantity, suppress changes over time, and improve reliability in order to enhance the control accuracy of the vehicle and ensure reliability.

[0017] In recent years, demands for fuel efficiency in vehicles and exhaust gas purification have become particularly stringent. To meet these demands, it is crucial to improve the detection accuracy of the physical quantity of the intake air (the gas IA to be measured), which is detected by the device 30. Furthermore, it is essential that the device 30 maintains high reliability in detecting this physical quantity.

[0018] The vehicle in which the device 30 for detecting a physical quantity is installed is used in an environment with high rates of temperature and humidity fluctuations. It is desirable that the device 30 for detecting a physical quantity respond to changes in temperature or humidity in the operating environment and to dust, contaminants, and the like.

[0019] The device 30 for detecting a physical quantity is attached to the inlet pipe, which is affected by heat generated by the internal combustion engine. Thus, heat generated by the internal combustion engine is transferred to the device 30 for detecting a physical quantity via the inlet pipe, which is the main passage 124. Since the device 30 for detecting a physical quantity detects the flow rate of the gas IA to be measured by performing heat transfer with the gas IA, it is important to suppress the influence of external heat as much as possible.

[0020] As described below, the device 30 attached to the vehicle for detecting a physical quantity not only solves the problem described in the section on the problem to be solved by the invention and not only performs the effect described in the section on the effect of the invention, but also solves various problems that are required as a single product, taking sufficient account of the various problems described above, and performs various effects. In the following description of the embodiment, the specific problems to be solved and the specific effects to be achieved by the device 30 for detecting a physical quantity are described. <Erste Ausführungsform>

[0021] A first embodiment of the present invention is described below with reference to the drawings.

[0022] Fig. Figure 2 is a schematic front view of a structure of a device 30 for the detection of a physical quantity.

[0023] The device 30 for detecting a physical quantity comprises a housing 302. The housing 302 includes a flange 303 for attaching the device 30 for detecting a physical quantity to an inlet body 71, which forms the main passage 124, a section 305 of an external connector (connector section) with an external terminal for electrical connection to an external device, and a measuring section 310 for measuring a flow rate or the like. In the device 30 for detecting a physical quantity, the flange 303 is attached to the inlet body (inlet pipe) 71 in such a way that the measuring section 310 is arranged in the main passage 124 and is supported in a cantilevered manner.

[0024] The measuring section 310, located in the main passage 124, is provided with a secondary passage 330, which extracts the gas IA to be measured from the main passage 124. A support element 603 is arranged in the center of the secondary passage 330. The support element 603 has the form of a flat plate, extends in the center of the secondary passage in a direction W corresponding to the width of the secondary passage, and divides a portion of the secondary passage into two flow paths: one on a front surface 603a (side of one surface) and one on a rear surface 603b (side of the other surface). These directions intersect the direction of flow. A flow rate detection element 602 is provided on the surface of the support element 603 to measure the flow rate of the gas IA to be measured flowing through the main passage 124. Examples of the supporting component include a circuit housing and a printed circuit board.

[0025] The secondary passage 330 contains a first secondary passage 31 and a second secondary passage 32. The first secondary passage 31 is a passage formed from the main inlet opening 350 to extract the gas IA to be measured, flowing through the main passage 124, to a main outlet 355 to expel the gas IA to be measured. Here, a case is shown where the gas IA to be measured is a forward flow. The second secondary passage 32 is a flow-measuring passage formed from a partial inlet opening 34, through which the gas IA to be measured, flowing in the first secondary passage 31, is extracted in the direction of the flow-measuring element 602. The secondary passage 330 allows foreign bodies such as dust and water to flow mainly into the first secondary passage 31, and allows clean air, which does not contain these foreign bodies, to be drawn into the second secondary passage 32.

[0026] The gas IA to be measured, drawn in from a main inlet opening 350 into the secondary passage 330, is divided into the first secondary passage 31 and the second secondary passage 32. The gas IA to be measured flowing through the second secondary passage 32 passes through the flow rate detection element 602, then flows into the first secondary passage 31, is combined with the gas IA to be measured flowing through the first secondary passage 31, and is then expelled from the main outlet 355.

[0027] The first secondary passage 31 is provided in the measuring section 310 in a state in which it is attached to the inlet body 71, running parallel to the flow direction of the gas IA to be measured flowing through the inlet body 71.

[0028] The main inlet opening 350 and the main outlet 355 are provided on the side of the distal end of the measuring section 310; the main inlet opening 350 is open to the inlet end section 311 of the measuring section 310 arranged on the inlet side in the main passage 124, and the main outlet 355 is open to the outlet end section 312 of the measuring section 310 arranged on the outlet side in the main passage 124.

[0029] The second secondary passage 32 branches off from the first secondary passage 31 at a partial inlet opening 34, which is open in a central position of the first secondary passage 31, and extends from a distal end section towards a proximal end section of the measuring section 310. Subsequently, the second secondary passage is curved near the proximal end section in a direction approaching the outlet end section 312 of the measuring section 310, extends again from the proximal end section towards the distal end section of the measuring section 310, and connects with the first secondary passage 31.

[0030] The second secondary passage 32 contains a first straight section 321, which extends linearly from the partial inlet opening 34 towards the proximal end section of the measuring section 310 and in which the supporting component 603 is arranged in a central position therein, an outlet-side curved section 322, which is continuous with the outlet side of the first straight section 321 and which is curved to one side in the passage width direction of the first straight section 321, and a second straight section 323, which extends linearly from the proximal end section towards the distal end section of the measuring section 310 to the outlet-side curved section 322 and which is connected to the first secondary passage 31.

[0031] The outlet-side curved section 322 has a semicircular arc shape, curved with a constant curvature from the side of the inlet-side end section 311 of the measuring section 310 towards the side of the outlet-side end section 312, which is a side in the passage width direction of the first straight section 321, and forms a 180° turn. The outlet-side curved section 322 has, on one side in the passage width direction, a curved wall surface 322a on the inner circumferential side with a large curvature and, on the other side in the passage width direction, a curved wall surface 322b on the outer circumferential side with a small curvature.The curved wall surface 322a on the inner circumferential side with a large curvature of the outlet-side curved section 322 is continuous with the side wall surface 321a on one side in the passage width direction of the first straight section 321 and the curved wall surface 322b on the outer circumferential side with a small curvature of the outlet-side curved section 322 is continuous with the side wall surface 321b on the other side in the passage width direction of the first straight section 321.

[0032] On the inlet side of the first straight section 321, a continuously curved section 324 is provided. The curved section 324 is located between the partial inlet opening 34 and the first straight section 321 and has a shape that is curved from the first straight section 321 to the other side in the passage width direction of the first straight section 321, in the present embodiment to the side of the inlet end section 311 of the measuring section 310. The inlet-side curved section 324 changes the direction of the gas IA to be measured, which is drawn in from the main inlet opening 350 into the secondary passage 330 and flows from the inlet end section 311 towards the outlet end section 312 of the measuring section 310, to the direction from the distal end section towards the proximal end section of the measuring section 310.

[0033] The following describes a configuration in which the occurrence of the measurement error is reduced by suppressing the displacement of the flow to one side in the passage and suppressing the pressure loss according to the present embodiment.

[0034] Fig. Figure 3 is a cross-sectional view along line QQ in Fig. 2.

[0035] The first straight section 321 of the second secondary passage 32 is divided into a surface flow path 331 on the side of surface 603a of the supporting element 603 and a flow path 332 of the rear surface on the side of rear surface 603b. The flow path 332 of the rear surface is divided by a partition 500 into an inner circumferential side passage 332a, which serves as a flow path on one side in the direction of the passage width, and an outer circumferential side passage 332b, which serves as a flow path on the other side in the direction of the passage width. The flow path 332 of the rear surface is divided such that the cross-sectional area of ​​the inner circumferential side passage 332a is smaller than the cross-sectional area of ​​the outer circumferential side passage 332b.

[0036] As in Fig. As shown in Figure 3, the partition 500 has a sufficient height to project towards the supporting element 603 from a lower surface 321c of the first straight section 321, which is the lower surface of the secondary passage 330, facing the rear surface (other surface) 603b of the supporting element 603, and to abut the other surface 603b of the supporting element 603. The partition 500 is formed integrally with the measuring section 310 and also functions as a component that positions and supports the supporting element 603 within the secondary passage 330. The partition 500 is arranged in a position facing the outlet end section 312 of the measuring section 310, i.e.,one side in the passage width direction with respect to the center position in the passage width direction of the flow path 332 of the rear surface, is displaced, and divides the flow path 332 of the rear surface in such a way that the cross-sectional area of ​​the inner circumferential side passage 332a is smaller than the cross-sectional area of ​​the outer circumferential side passage 332b.

[0037] The partition 500 can have the same length or a slightly shorter length than the length in the flow direction of the fluid flowing through the secondary passage 330 of the supporting element 603 and has a size that is hidden behind the rear surface 603b of the supporting element 603 when the device 30 is used for the detection of a physical quantity, as in Fig. Figure 2 shows the front view. In the present embodiment, the partition 500 extends along the first straight section 321 and has a length from the inlet end section to the outlet end section of the support component 603. That is, the inlet end section of the partition 500, located on the inlet side of the first straight section 321, is in the same position as the inlet end section of the support component 603, and the outlet end section of the partition 500, located on the outlet side of the first straight section 321, is in the same position as the outlet end section of the support component 603.

[0038] The length of the partition 500 can be less than the length from the inlet end section to the outlet end section of the supporting component 603. For example, the inlet end section of the partition 500 can be located at a position on the outlet side of the first straight section 321 relative to the inlet end section of the supporting component 603, and the outlet end section of the partition 500 can be located at a position on the inlet side of the first straight section 321 relative to the outlet end section of the supporting component 603.

[0039] Fig. Figure 4A is a schematic view of a flow velocity distribution at a section line of a cross-section along the line PP in Fig. 2 and a cross-section along line SS in Fig. 3, if no partition wall is provided, and Fig. 4B is a schematic representation to illustrate a pressure state when a gas to be measured is at the pressure shown in Fig. The flow velocity distribution shown in 4A flows into a section curved at the outlet.

[0040] In the known case where the partition 500 is not provided in the flow path 332 of the rear surface, the flow velocity distribution of the gas IA to be measured in the first straight section 321 of the second secondary passage 32 is not optimized. As in Fig. As shown in 4A, a peak of the flow velocity distribution can thus be shifted from the side wall surface 321b on the other side in the passage width direction of the first straight section 321 towards the side wall surface 321a on one side in the passage width direction of the first straight section 321.In particular, if the inlet-side curved section 324 is provided continuously on the inlet side of the first straight section, the gas IA to be measured, taken from the main inlet opening 350, flows from the first secondary passage 31 into the second secondary passage 32, changing direction so that the centrifugal force acts on the gas IA to be measured, the flow velocity on one side in the passage width direction is higher than on the other side in the passage width direction and the flow velocity distribution tends to be shifted towards the side of the side wall surface 321a that is one side in the passage width direction of the first straight section 321.

[0041] When the gas IA to be measured, in which the flow velocity distribution is shifted towards the side wall surface 321a on one side in the passage width direction of the first straight section 321, flows as it is into the outlet-side curved section 322, the flow velocity component that collides with the curved wall surface 322b on the outer circumferential side with a small curvature of the outlet-side curved section 322 is large, and consists, as in Fig. As shown in Figure 4B, one possibility is that a high-pressure region Sa is generated at the outlet-side curved section 322 due to the collision, in which the pressure locally increases. The generation of the high-pressure region Sa increases the flow resistance in the passage, makes it more difficult for the gas IA to be measured to flow, reduces the flow rate in the passage of the second secondary passage 32, and, due to the reduction in the detection flow of the flow rate detection element 602, increases the generation of measurement error. Thus, the error changes in accordance with the pulsation condition and the detection accuracy can decrease.

[0042] Fig. 5A is a schematic view of a flow velocity distribution at a section line of a cross-section along the line PP in Fig. 2 and a cross-section along line SS in Fig. 3, if no partition wall is provided, and Fig. 5B is a schematic representation to illustrate a pressure state when a gas to be measured is at the pressure shown in Fig. The flow velocity distribution shown in 5A flows into a section curved at the outlet.

[0043] On the other hand, in the present embodiment, the partition 500 is provided in the flow path 332 of the rear surface and is arranged in a position that is displaced towards the side wall surface 321a, which is one side in the passage width direction with respect to the center position in the passage width direction of the first straight section 321. The flow path 332 of the rear surface is divided by the partition 500 into an inner circumferential side passage 332a and an outer circumferential side passage 332b, the inner circumferential side passage 332a having a smaller cross-sectional area than the outer circumferential side passage 332b. In the present embodiment, a passage width wi of the inner circumferential side passage 332a of the flow path 332 of the rear surface is smaller than a passage width wo of the outer circumferential side passage 332b.The passage width wo of the outer perimeter side passage 332b is greater than a width wt of the partition wall 500.

[0044] With this configuration, it is less likely that the gas IA to be measured, passing through the flow path 332 of the rear surface, will flow through the inner circumferential side passage 332a than through the outer circumferential side passage 332b. Furthermore, a portion of the gas IA to be measured, passing through the flow path 332 of the rear surface, is partially displaced across the side wall surface 321a, which is one side in the passage width direction of the first straight section 321, towards the side wall surface 321b, which is the other side in the passage width direction of the first straight section 321. Thus, a flow rate IAo passing through the outer circumferential side passage 332b is greater than a flow rate IAi passing through the inner circumferential side passage 332a. As in Fig. As shown in Figure 5A, the result may be, for example, that a peak in the flow velocity distribution is shifted to the central position in the passage width direction of the flow path 332 of the rear surface if the flow velocity distribution of the gas IA to be measured flowing into the first straight section 321 is shifted towards the side wall surface 321a, which is one side in the passage width direction of the first straight section 321, as shown in Figure 5A. Fig. 4A is shown, but is shifted.

[0045] If the gas IA to be measured, whose flow velocity distribution has shifted towards the side of the side wall surface 321b that is the other side in the passage width direction of the first straight section 321, as in Fig. As shown in Figure 5B, the gas IA to be measured flows into the outlet-side curved section 322. Along the curved wall surface 322b on the outer circumferential side, the gas IA is gently displaced to one side by a small curvature of the outlet-side curved section 322. Thus, compared to the known structure in which the partition 500 is not provided in the flow path 332 of the rear surface, the flow velocity component that collides with the curved wall surface 322b on the outer circumferential side of the outlet-side curved section 322 is reduced, the pressure increase is reduced, the resistance of the curved section is reduced, and the gas IA to be measured flows easily into the secondary passage 32.Thus, the flow rate of the gas IA to be measured in the passage of the second secondary passage 32 is increased and the occurrence of the measurement error is reduced by the increase in the detection flow rate of the flow rate detection element 602.

[0046] According to the device 30 for detecting a physical quantity of the present embodiment, it is possible to reduce the pressure increase in the outlet-side curved section 322 and the pressure drop that accompanies the pressure increase. Thus, the flow rate can be stably detected even in a case where the flow rate of the gas IA to be measured in the main passage 124 is low and the inflow rate of the gas IA to be measured into the secondary passage 330 decreases, or in a case where the flow rate of the gas IA to be measured in the main passage 124 is high and the inflow rate of the gas IA to be measured into the secondary passage 330 decreases due to the pressure drop in the outlet-side curved section 322, as in the known form.

[0047] In the present embodiment, the inner circumferential side passage 332a of the flow path 332 of the rear surface is not completely closed and allows a fluid with a high flow velocity to pass over the flow path 332 of the rear surface on the side of the side wall surface 321a that is one side in the passage width direction of the first straight section 321. For example, if all parts with a high flow velocity of the gas IA to be measured, passing over one side in the passage width direction of the flow path 332 of the rear surface, are shifted and delayed to one side, the pressure increase of the flow path 332 of the rear surface increases, and the resistance in the passage increases instead if a resistance component with a simple throttle shape is provided to reduce the cross-sectional area of ​​the entire flow path 332 of the rear surface.On the other hand, the pressure increase of the flow path 332 of the rear surface can also be prevented and the resistance in the passage reduced if the divided passage is divided by the partition 500 as in the present embodiment.

[0048] In the device 30 for detecting a physical quantity of the present embodiment, the secondary passage 330 includes the first straight section 321, which is linear and on which the support element 603 is arranged, and the outlet-side curved section 322, which is continuous with the outlet side of the first straight section 321 and which is curved to one side in the passage width direction of the first straight section 321. The first straight section 321 is provided with the partition 500, which divides the flow path 332 of the rear surface of the support element 603 into two flow paths, i.e.in the inner circumferential side passage 332a on one side and in the outer circumferential side passage 332b on the other side in the passage width direction, divides and is under the inner circumferential side passage 332a and the outer circumferential side passage 332b, which are divided by the partition 500, a cross-sectional area of ​​the inner circumferential side passage 332a is smaller than a cross-sectional area of ​​the outer circumferential side passage 332b.

[0049] According to the present embodiment, the partition 500 is provided in the flow path 332 of the rear surface, and the cross-sectional area of ​​the inner circumferential side passage 332a of the flow path 332 of the rear surface is smaller than the cross-sectional area of ​​the outer circumferential side passage 332b. This suppresses the lateral displacement of the flow in the first straight section 321, optimizes the flow rate distribution, and reduces the resistance in the passage in the outlet-side curved section 322. As a result, the flow rate in the secondary passage increases, the flow rate detected by the flow rate detection element 602 increases, and the occurrence of the measurement error is reduced. Thus, it is possible to optimize the flow velocity distribution in the secondary passage and prevent fluctuations in the error under multiple pulsation conditions.

[0050] In the device 30 for detecting a physical quantity of the present exemplary embodiment, the partition 500 is provided only in the flow path 332 of the rear surface and is not provided on the side of the surface flow path 331. More precisely, the partition 500 has a sufficient height to project from the lower surface 321c of the secondary passage, which faces the rear surface 603b of the support element 603, in the direction of the support element 603 and to abut the rear surface 603b of the support element 603, and it does not project in the direction of the front surface 603a of the support element 603 in the first straight section 321.

[0051] Thus, the partition 500 does not cause any disturbance, such as a vortex flow, with respect to the gas IA to be measured, which flows through the surface flow path 331 of the support element 603, and it is possible to prevent the influence of the flow rate detection element 602, arranged on the surface 603a of the support element 603, on the detection accuracy. Furthermore, by bringing the partition 500 into contact with the rear surface 603b of the support element 603, the position of the support element 603 can be positioned in the secondary passage 330, and any difference in the flow path area between the surface flow path 331 and the flow path 332 of the rear surface can be eliminated.

[0052] The device 30 for detecting a physical quantity of the present embodiment can increase the flow rate towards the flow rate detection element 602 in the secondary passage 330, optimize the deviation of the flow velocity distribution present on the inlet side with respect to the outlet-side curved section 322, and reduce the flow velocity component that collides with the curved wall surface 322b on the outer circumferential side of the outlet-side curved section 322. Thus, by suppressing the generation of the high-pressure region Sa in the outlet-side curved section 322, reducing the pressure drop in the secondary passage 330, increasing the flow rate flowing in the secondary passage 330, and increasing the detection range of the flow rate detection element 602, the detection performance can be improved. <Zweite Ausführungsform>

[0053] The following will be based on Fig. 6 and Fig. 7 A second embodiment according to the present invention is described. It is noted that configurations similar to those of the first embodiment are designated by the same reference numerals and that their detailed description has been omitted. Fig. Figure 6 is a schematic front view of a structure of a device for detecting a physical quantity according to a second embodiment, and Fig. Figure 7 is a schematic representation of a cross-section along line RR in Fig. 6.

[0054] A characteristic feature of the present embodiment is that the partition 500, which divides the passage on the side of the rear surface of the flow rate detection element 602, is extended along the direction of travel of the first straight section 321 to the inlet side and to the outlet side and has a long shape in the flow direction that is longer than the supporting component 603.

[0055] The height of the partition 500 is constant from the inlet-side end section to the outlet-side end section and, as shown in Fig. As shown in Figure 7, the height of the supporting element 602 does not change in the direction of the flow rate detection element 603, even when positioned on the rear surface of the supporting element. The partition 500 has an inlet-side extension wall 500a, which extends from the supporting element 603 along the first straight section 321 towards the inlet of the first straight section 321, and an outlet-side extension wall 500b, which extends from the supporting element 603 along the first straight section 321 towards the outlet of the first straight section 321. The inlet-side extension wall 500a and the outlet-side extension wall 500b have the same height as a portion that divides the flow path 332 of the rear surface of the partition 500.

[0056] Since the height of the partition 500 according to the present embodiment does not reach the surface flow path 331, which is a passage on the side of the surface 603a of the supporting component 603, the flow of the gas IA to be measured, which passes through the flow rate detection element 602, is not disturbed.

[0057] Since the length of the partition 500 is greater than that of the first embodiment, the lateral flow shift in the first straight section 321 can be further suppressed compared to the first embodiment. Thus, the flow rate distribution of the gas IA to be measured in the second secondary passage 32 is optimized compared to the first embodiment, the resistance in the passage in the outlet-side curved section 322 is reduced, and the gas IA to be measured flows easily in the secondary passage 32. Consequently, the flow rate of the gas IA to be measured in the passage of the second secondary passage 32 is increased, and the occurrence of the measurement error due to the increase in the detection flow rate of the flow rate detection element 602 is reduced.

[0058] This makes it possible to prevent the detection accuracy from deteriorating due to a change in the error according to the pulsation condition. <Dritte Ausführungsform>

[0059] The following will be based on Fig. 8 A third embodiment according to the present invention is described. It is noted that configurations similar to those of the embodiments described above are designated by the same reference numerals and that their detailed description has been omitted.

[0060] Fig. Figure 8 is a schematic front view of a structure of a device for detecting a physical quantity according to the third embodiment. Fig. Figure 8 is a schematic view of the device 30 for detecting a physical quantity from a similar direction as in Fig. 2 and Fig. 6 seen and is a view in which in Fig. 3 the cross-section SS shown is the cross-section of the passage, which represents a cross-section of the flow path 332 of the rear surface.

[0061] Thus, the flow rate detection element 602 and the support component 603 are indicated by dashed lines. In this drawing, the flow path 332 of the rear surface is divided by a partition 501 into an inner circumferential side passage 332a and an outer circumferential side passage 332b.

[0062] A characteristic feature of the present embodiment is that the partition 501 is inclined relative to the first straight section 321. Unlike the partition 500 of the first embodiment, the partition 501 is not parallel to the flow direction of the first straight section 321. The partition 501 is inclined relative to the first straight section 321 so that the cross-sectional area of ​​the inner circumferential side passage 332a gradually increases or decreases as its position in the first straight section 321 changes from the inlet side to the outlet side.

[0063] If the outlet side has a TT cross-section in Fig. As can be seen in Figure 8, the minimum cross-sectional area of ​​the inner circumferential passage 332a is smaller than the minimum cross-sectional area of ​​the outer circumferential passage 332b. In the present embodiment, the inner circumferential passage 332a has a narrow cross-sectional area on the inlet side with respect to the flow direction of the gas IA to be measured in the first straight section 321, and a wide cross-sectional area on the outlet side. The inner circumferential passage 332a can have a wide cross-sectional area on the inlet side and a narrow cross-sectional area on the outlet side with respect to the flow direction.

[0064] According to the present embodiment, similar to the first embodiment, the gas IA to be measured, which flows near the inner circumferential passage 332a, is displaced to the outer circumferential side, and the component of the gas IA to be measured that collides with the outlet-side curved section 332 is reduced. Thus, the resistance in the passage is reduced, and the detection flow rate of the flow rate detection element 602 is increased, thereby reducing the occurrence of measurement error. <Vierte Ausführungsform>

[0065] The following will be based on Fig. 9 A fourth embodiment according to the present invention is described. It is noted that configurations similar to those of the embodiments described above are designated by the same reference numerals and that their detailed description has been omitted.

[0066] Fig. Figure 9 is a schematic front view of a structure of a device for detecting a physical quantity according to the fourth embodiment. Fig. Figure 9 is a schematic view of the device 30 for detecting a physical quantity from a similar direction as in Fig. 8 seen and is a view in which Fig. The cross-section SS shown in Figure 3 is the cross-section of the passage, which represents a cross-section of the flow path 332 of the rear surface. Thus, the flow rate detection element 602 and the support component 603 are indicated by dashed lines. A characteristic feature of the present embodiment is that, in the flow path 332 of the rear surface, instead of the partitions 500 and 501 in each of the embodiments described above, an obstruction 502 is arranged, and that the flow path 332 of the rear surface is divided by the obstruction 502 into the inner circumferential side passage 332a and the outer circumferential side passage 332b.

[0067] The obstacle 502 is made of three rod-shaped components and is similar to the partition wall 500. Fig. 3 at a position that divides the flow path 332 of the rear surface into the inner circumferential side passage 332a and the outer circumferential side passage 332b, and at a position where the cross-sectional area of ​​the inner circumferential side passage 332a of the flow path 332 of the rear surface is smaller than the cross-sectional area of ​​the outer circumferential side passage 332b, arranged side by side at a predetermined distance. The number of obstacles in the present embodiment is not limited to three and can be less than or greater than three.

[0068] In the Fig. In the example shown in Figure 9, the obstruction 502 is installed in a smaller area than the length of the flow direction of the support element 603 of the flow rate detection element 602 and is concealed by the support element 603 when viewed from the front. However, the obstruction 502 can be installed in a larger area than the length of the flow direction of the support element 603. However, the height of the obstruction 502 is similar to that of the partition 500. Fig. 7 smaller than the surface 603a of the supporting component 603 and does not reach the surface flow path 331. Additionally, in the Fig. In the example shown in Figure 9, the several obstacles 502 are arranged parallel to the flow direction of the first secondary passage 31, but the several obstacles cannot be parallel to the flow direction.

[0069] The gas IA to be measured, flowing over the flow path 332 of the rear surface, is displaced from the inner circumferential side passage 332a to the outer circumferential side passage 332b by the obstruction 502 and is gently shifted to one side when the flow reaches the outlet-side curved section 322. Thus, the pressure increase at the outlet-side curved section 322 is reduced, the resistance in the passage is reduced, the detection range of the flow rate detection element 602 is increased, and the occurrence of measurement error is reduced.

[0070] Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the embodiments described above, and various design modifications can be made without departing from the main point of the present invention as described in the claims. For one embodiment, the embodiments described above are described in detail to provide an easily understandable description of the present invention, and they are not necessarily limited to those that have all the described configurations. Furthermore, part of the configuration of one embodiment can be replaced by the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment.Furthermore, it is possible to add, remove, and replace other configurations for a part of the configuration of each embodiment. Reference symbol list 30 Device for the detection of a physical quantity 31 first side passage 32 second side passage 34 Partial inlet opening 302 Cases 321 first straight section 322 outlet-side curved section 330 Side passage 332a Inner circumferential side passage 332b Outer circumferential side passage 350 Main inlet opening 355 Main outlet 500, 501 Partition wall 502 Obstacle (rod-shaped component) 602 Flow rate detection element 603 Load-bearing component

Claims

[1] Device for detecting a physical quantity (30) that detects a physical quantity of a gas (IA) to be measured flowing in a main passage (124), the device for detecting a physical quantity (30) comprising: a measuring section (310) arranged in the main passage (124); a secondary passage (330) provided in the measuring section (310) and configured to extract the gas (IA) to be measured from the main passage (124); a supporting element (603) extending in a center of the passage of the secondary passage (330) across a passage width direction of the secondary passage (330) and dividing a portion of the secondary passage (330) in a direction intersecting the passage width direction into two flow paths on the side of one surface (603a) and on the side of the other surface (603b); and a flow rate detection element (602),which is arranged on a surface (603a) of the supporting component (603) and detects a flow rate of the gas to be measured (IA) in the secondary passage (330), wherein the secondary passage (330) comprises a straight section (321) which is linear and on which the supporting component (603) is arranged, and an outlet-side curved section (322) which is continuous with an outlet side of the straight section (321) and is curved in one direction in the passage width direction of the straight section (321), wherein the straight section (321) is provided with a partition (500, 501, 502) which divides the flow path (332) on the side of the other surface (603b) of the supporting component (603) in the passage width direction into two flow paths on one side and on the other side, and between the two flow paths on one side and on the other side in the passage width direction, which are divided by the partition (500, 501, 502),a cross-sectional area of ​​the flow path (332a) on one side in the direction of the passage width is smaller than a cross-sectional area of ​​the flow path (332b) on the other side in the direction of the passage width, , characterized by , that the partition wall (502) contains several rod-shaped components which are arranged next to each other at predetermined intervals in a direction of the straight section (321). [2] Device for detecting a physical quantity (30) according to claim 1, wherein the partition (500) has a sufficient height to project from a lower surface (321c) of the secondary passage (330), which faces the other surface (603b) of the supporting component (603), in the direction of the supporting component (603) and to abut the other surface (603b) of the supporting component (603). [3] Device for detecting a physical quantity (30) according to claim 2, wherein the partition (500) extends along the straight section (321), an inlet-side end section of the partition (500) which is arranged on an inlet side of the straight section (321), is arranged in relation to the inlet-side end section of the support element (603) at the same position as an inlet-side end section of the support element (603) or at a position on an outlet side of the straight section (321), and the outlet-side end section of the partition (500) which is arranged on an outlet side of the straight section (321) is arranged in relation to the outlet-side end section of the support element (603) at the same position as an outlet-side end section of the support element (603) or at a position on an inlet side of the straight section (321). [4] Device for detecting a physical quantity (30) according to claim 2, wherein the partition (500) has an inlet-side extension wall (500a) which is extended from the supporting component (603) along the straight section (321) in the direction of the inlet of the straight section (321), and an outlet-side extension wall (500b) which is extended from the supporting component (603) along the straight section (321) in the direction of the outlet side of the straight section (321). [5] Device for detecting a physical quantity (30) according to claim 1, wherein the partition (500, 501) is arranged at a position which is displaced in the direction of one side in the passage width direction from a central position in the passage width direction of the secondary passage (330). [6] Device for the detection of a physical quantity (30) according to claim 1, wherein in the partition (501) a minimum section of a cross-sectional area of ​​a flow path (332a) on one side in the passage width direction is smaller than a minimum section of a cross-sectional area of ​​a flow path (332b) on the other side in the passage width direction. [7] Device for detecting a physical quantity (30) according to claim 1, wherein the secondary passage (330) includes an inlet-side curved section (324) which is continuous with an inlet side of the straight section (321) and is curved to the other side in a passage width direction of the straight section (321).

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