Analysis device

Abstract

To accurately predict rotor behavior and oil behavior for an oil pump.SOLUTION: A processor of an analysis device executes processing including: setting as a division point, a first point where an inner rotor and an outer rotor of a pump are in contact with each other; setting as a division point, a second point on the outer rotor positioned on an extended line connecting the center of the inner rotor and each apex; setting as a division point, a third point that changes with an angle between a reference point and the second point; dividing a chamber between the inner rotor and the outer rotor at a connection line connecting the first point, the second point, the third point, and the center of the inner rotor; and, if the first point and the third point are overlapping, dividing the chamber without using as a division point, the third point overlapping with the first point.SELECTED DRAWING: Figure 10

Description

Technical Field

[0001] The present invention relates to an analysis device.

Background Art

[0002] Conventionally, an oil pump that boosts oil pressure using the rotational power of an engine has been known. The oil pump includes an inner rotor and an outer rotor, and as the inner rotor and the outer rotor rotate, the amount of clearance between their teeth varies to suck and boost the oil. Patent Document 1 discloses a numerical calculation model for calculating the operation of an oil pump having an inner rotor and an outer rotor.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Incidentally, the chamber formed as the gap between the inner rotor and the outer rotor is divided in the rotation direction of the inner rotor by the contact between the teeth of the inner rotor and the teeth of the outer rotor. In order to accurately predict the rotor behavior and oil behavior of the oil pump, it is necessary to accurately obtain the volume change of each chamber divided in the rotation direction. Here, when the contact point where the teeth of the inner rotor and the teeth of the outer rotor come into contact is set as the division point of each chamber and the chamber is divided using the set division point, the number of chambers varies according to the rotation of the inner rotor and the outer rotor. This is because, due to the rotation of the inner rotor and the outer rotor, the contact points where the inner rotor and the outer rotor contact each other become non-contact points, or the non-contact points become contact points. If the number of chambers varies, the predetermined chamber being calculated suddenly disappears, or a chamber that has not been calculated suddenly appears, so that the volume of each chamber does not change continuously, and an error occurs in the calculation of the volume of each chamber. As a result, it has been difficult to accurately predict the rotor behavior and oil behavior of the oil pump.

[0005] Therefore, an object of the present invention is to provide an analysis device capable of accurately predicting the rotor behavior and oil behavior of an oil pump.

Means for Solving the Problems

[0006] To solve the above problems, the analysis device of the present invention includes one or more processors, and one or more memories connected to the processor, and the processor sets the first point where the inner rotor and the outer rotor of the pump come into contact as the division point, sets the second point on the outer rotor located on the extension line connecting the center of the inner rotor and each vertex as the division point, sets the third point that changes according to the angle between the reference point and the second point as the division point, Dividing the chamber between the inner rotor and the outer rotor with a connecting line connecting the first point, the second point, the third point, and the center of the inner rotor; When the first point and the third point overlap, dividing the chamber without using the third point overlapping with the first point as the dividing point; Executing a process including this.

Advantages of the Invention

[0007] According to the present invention, it becomes possible to accurately predict the rotor behavior and oil behavior of an oil pump.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Figure 14

[0009] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Dimensions, materials, and other specific numerical values shown in such embodiments are merely examples for facilitating understanding of the invention, and do not limit the present invention unless otherwise specified. In the present specification and drawings, elements having substantially the same function and configuration are denoted by the same reference numerals, and redundant description is omitted, and elements not directly related to the present invention are not shown.

[0010] FIG. 1 is a schematic configuration diagram showing the configuration of the analysis system 100 according to the present embodiment. As shown in FIG. 1, the analysis system 100 includes a hydraulic circuit 200 and an analyzer 300. The hydraulic circuit 200 includes an oil pan 210, a suction passage 220, an oil pump 230, a main discharge passage 240, a sub discharge passage 250, and a confluence passage 260.

[0011] The hydraulic circuit 200 of the present embodiment is provided in, for example, a vehicle. Specifically, the hydraulic circuit 200 of the present embodiment is a hydraulic circuit for supplying oil to each part of the vehicle transmission. However, it is not limited thereto, and the hydraulic circuit 200 may be, for example, a hydraulic circuit for supplying oil to each part of the vehicle engine.

[0012] The oil pan 210 stores oil. The suction passage 220 connects the oil pan 210 and the oil pump 230. The suction passage 220 guides the oil stored in the oil pan 210 to the oil pump 230. The oil pump 230 is disposed between the suction passage 220, the main discharge passage 240, and the sub-discharge passage 250. The oil pump 230 pressurizes the oil sucked from the suction passage 220 and discharges the pressurized oil to the main discharge passage 240 and the sub-discharge passage 250.

[0013] The oil pump 230 includes a housing 231, an inner rotor 232, and an outer rotor 233. The oil pump 230 of the present embodiment is a so-called internal gear pump. The housing 231 is formed with a suction port 231a, a main discharge port 231b, a sub-discharge port 231c, and an accommodation chamber 231d. The suction port 231a communicates the suction passage 220 and the accommodation chamber 231d. The main discharge port 231b communicates the accommodation chamber 231d and the main discharge passage 240. The sub-discharge port 231c communicates the accommodation chamber 231d and the sub-discharge passage 250.

[0014] The accommodation chamber 231d accommodates the inner rotor 232 and the outer rotor 233. The inner rotor 232 and the outer rotor 233 are rotatably accommodated in the accommodation chamber 231d and rotate, for example, by the rotational power of an engine mounted on the vehicle. The inner rotor 232 is provided with a plurality of external teeth 232a (see FIG. 3) on its outer peripheral surface. In the present embodiment, the number of teeth of the external teeth 232a of the inner rotor 232 is 8. However, the number of teeth of the external teeth 232a of the inner rotor 232 is not limited to 8.

[0015] The outer rotor 233 is provided with a plurality of internal teeth 233a (see FIG. 3) on its inner peripheral surface. In this embodiment, the number of teeth of the internal teeth 233a of the outer rotor 233 is 9. However, the number of teeth of the internal teeth 233a of the outer rotor 233 is not limited to 9. The number of teeth of the internal teeth 233a of the outer rotor 233 may be the number of teeth of the external teeth 232a of the inner rotor 232 + 1. A chamber 234 is formed as the gap between the inner rotor 232 and the outer rotor 233. The chamber 234 is divided into a plurality by the contact between the external teeth 232a of the inner rotor 232 and the internal teeth 233a of the outer rotor 233.

[0016] The inner rotor 232 and the outer rotor 233 rotate in the clockwise direction in FIG. 1 in the state of being accommodated in the accommodation chamber 231d. Each of the plurality of divided chambers 234 is partitioned in the rotation direction of the inner rotor 232 and the outer rotor 233. The inner rotor 232 has, for example, a shaft (not shown) that rotates by the power of an engine inserted through the center and rotates integrally with the shaft.

[0017] The external teeth 232a have one less tooth than the internal teeth 233a, and the inner rotor 232 and the outer rotor 233 are meshed in an eccentric state with each other. When the inner rotor 232 rotates clockwise in FIG. 1, the outer rotor 233 also rotates clockwise integrally with the inner rotor 232. At this time, the plurality of chambers 234 between the external teeth 232a and the internal teeth 233a are sequentially reduced and expanded repeatedly.

[0018] The suction port 231a communicates with the chamber 234 in the rotation axis direction of the inner rotor 232. The suction port 231a opens in the range where the volume of each chamber 234 expands as the inner rotor 232 and the outer rotor 233 rotate in the accommodation chamber 231d. Due to the negative pressure action caused by the expansion of the volume of each chamber 234, oil is guided from the suction port 231a to the chamber 234.

[0019] The main discharge port 231b communicates with the chamber 234 in the rotational axis direction at a position different from the suction port 231a in the rotational direction of the inner rotor 232. The main discharge port 231b opens in a range within the housing chamber 231d where the volume of each chamber 234 decreases as the inner rotor 232 and the outer rotor 233 rotate. Due to the compression action caused by the volume reduction of each chamber 234, the oil pressurized from the chamber 234 to the main discharge port 231b is discharged.

[0020] The sub-discharge port 231c communicates with the chamber 234 in the rotational axis direction at a position different from the suction port 231a and the main discharge port 231b in the rotational direction of the inner rotor 232. The sub-discharge port 231c opens in a range within the housing chamber 231d where the volume of each chamber 234 decreases as the inner rotor 232 and the outer rotor 233 rotate. Due to the compression action caused by the volume reduction of each chamber 234, the oil pressurized from the chamber 234 to the sub-discharge port 231c is discharged.

[0021] The main discharge port 231b is provided behind the suction port 231a in the rotational direction of the inner rotor 232, and the sub-discharge port 231c is provided behind the main discharge port 231b in the rotational direction of the inner rotor 232. That is, the suction port 231a, the main discharge port 231b, and the sub-discharge port 231c are provided at intervals in the rotational direction of the inner rotor 232.

[0022] The main discharge path 240 connects the main discharge port 231b of the oil pump 230 and the confluence path 260. The main discharge path 240 supplies the oil discharged from the oil pump 230, for example, to operate each part of the transmission, and guides the supplied oil to the confluence path 260.

[0023] The sub-discharge passage 250 connects the sub-discharge port 231c of the oil pump 230 and the confluence passage 260. The sub-discharge passage 250 supplies the oil discharged from the oil pump 230, for example, to lubricate each part of the transmission, and guides the supplied oil to the confluence passage 260.

[0024] The confluence passage 260 connects the main discharge passage 240 and the sub-discharge passage 250 to the oil pan 210. The confluence passage 260 returns the oil sent from the main discharge passage 240 and the sub-discharge passage 250 to the oil pan 210.

[0025] A main hydraulic pressure sensor P1 is provided in the main discharge passage 240. The main hydraulic pressure sensor P1 measures the hydraulic pressure of the oil flowing through the main discharge passage 240 and outputs a signal indicating the measured hydraulic pressure to the analysis device 300. A sub-hydraulic pressure sensor P2 is provided in the sub-discharge passage 250. The sub-hydraulic pressure sensor P2 measures the hydraulic pressure of the oil flowing through the sub-discharge passage 250 and outputs a signal indicating the measured hydraulic pressure to the analysis device 300.

[0026] Based on the signals output from the main hydraulic pressure sensor P1 and the sub-hydraulic pressure sensor P2, the analysis device 300 actually measures the behavior of the oil discharged from the oil pump 230. In addition, the analysis device 300 performs rotor behavior prediction for predicting the behavior of the inner rotor 232 and the outer rotor 233 of the oil pump 230, and oil behavior prediction for predicting the behavior of the oil discharged from the oil pump 230.

[0027] The analysis device 300 includes an I / F unit 310, a data holding unit 320, a system bus 330, one or more processors 340, and one or more memories 350. The I / F unit 310 is an interface for acquiring the signals output from the main hydraulic pressure sensor P1 provided in the main discharge passage 240 and the sub-hydraulic pressure sensor P2 provided in the sub-discharge passage 250.

[0028] The data holding unit 320 is composed of a RAM, a flash memory, an HDD, etc., and holds various information necessary for the processing of the processor 340 shown below. For example, the data obtained by the I / F unit 310 is held in the data holding unit 320. The system bus 330 is a transmission path that electrically connects the I / F unit 310, the data holding unit 320, the processor 340, and the memory 350, and transmits data among them.

[0029] The processor 340 includes, for example, a CPU (Central Processing Unit). The memory 350 includes, for example, a ROM (Read Only Memory) and a RAM (Random Access Memory). The ROM is a storage element that stores programs and arithmetic parameters used by the CPU. The RAM is a storage element that temporarily stores data such as variables and parameters used in the processing executed by the CPU.

[0030] FIG. 2 is a block diagram showing an example of the functional configuration of the analysis device 300 according to the present embodiment. For example, as shown in FIG. 2, the analysis device 300 includes a setting unit 300a, a division unit 300b, and a derivation unit 300c. Note that various processes including the processes described below performed by the setting unit 300a, the division unit 300b, and the derivation unit 300c are executed by the processor 340 executing the programs stored in the memory 350. Details of the setting unit 300a, the division unit 300b, and the derivation unit 300c will be described later.

[0031] Incidentally, the chamber 234 formed as the gap between the inner rotor 232 and the outer rotor 233 is divided in the rotation direction of the inner rotor 232 due to the contact between the outer teeth 232a of the inner rotor 232 and the inner teeth 233a of the outer rotor 233. In order to accurately predict the rotor behavior and oil behavior of the oil pump 230, it is necessary to accurately obtain the volume change of each chamber 234 divided in the rotation direction. Here, consider the case where the contact point where the outer teeth 232a of the inner rotor 232 and the inner teeth 233a of the outer rotor 233 come into contact is set as the division point of each chamber 234. In this case, when the chamber 234 is divided using the set division point, the number of chambers 234 fluctuates according to the rotation of the inner rotor 232 and the outer rotor 233. This is because, due to the rotation of the inner rotor 232 and the outer rotor 233, the contact points where the inner rotor 232 and the outer rotor 233 contact each other become non-contact points, or the non-contact points become contact points. If the number of chambers 234 fluctuates, the predetermined chamber 234 being calculated suddenly disappears, or a chamber 234 that has not been calculated suddenly appears. As a result, the volume of each chamber 234 does not change continuously, and an error occurs in the calculation of the volume of each chamber 234. Consequently, it becomes difficult to accurately predict the rotor behavior and oil behavior of the oil pump 230.

[0032] Hereinafter, the fluctuation of the number of each chamber 234 when the contact point where the inner rotor 232 and the outer rotor 233 contact each other is set as the division point of each chamber 234 will be described. Also, hereinafter, the contact point where the inner rotor 232 and the outer rotor 233 contact each other is referred to as the first point (hereinafter simply referred to as the first point) as the division point for dividing each chamber 234.

[0033] FIG. 3 is a schematic configuration diagram showing the state of the first point of the inner rotor 232 and the outer rotor 233 at a predetermined rotation angle A. FIG. 4 is a schematic configuration diagram showing the state of the first point of the inner rotor 232 and the outer rotor 233 at a predetermined rotation angle B. FIG. 5 is a schematic configuration diagram showing the state of the first point of the inner rotor 232 and the outer rotor 233 at a predetermined rotation angle C. Here, the rotation angle A is an angle a predetermined angle before the rotation angle B. Also, the rotation angle C is an angle a predetermined angle after the rotation angle B.

[0034] In FIGS. 3, 4, and 5, the first point is indicated by a black circle PO1. Also, the center point of the inner rotor 232 is indicated by O. As shown in FIG. 3, at the rotation angle A, when the first point PO1 is used as a dividing point and each chamber 234 is divided by a connecting line connecting the center point O and the first point PO1, the number of each divided chamber 234 is 10. At this time, the number of the first points PO1 is 10. Note that the first point PO1 is derived by calculating the positions and rotation angles of the inner rotor 232 and the outer rotor 233.

[0035] Also, as shown in FIG. 4, at the rotation angle B, when the first point PO1 is used as a dividing point and each chamber 234 is divided by a connecting line connecting the center point O and the first point PO1, the number of each divided chamber 234 is 12. At this time, the number of the first points PO1 is 12. Here, as shown in FIG. 4, a point where the apex of the outer teeth 232a of the inner rotor 232 contacts the apex of the inner teeth 233a of the outer rotor 233 is defined as a reference point BP. Also, a state where the first point PO1 is located at the reference point BP is defined as a reference position of the inner rotor 232 and the outer rotor 233. Also, the upper side of FIG. 4 from the center point O when the inner rotor 232 and the outer rotor 233 are in the reference position is referred to as the upper land, and the lower side of FIG. 4 from the center point O is referred to as the lower land.

[0036] As can be understood by comparing FIGS. 3 and 4, when the inner rotor 232 and the outer rotor 233 move from the rotation angle A to the rotation angle B, at the position of the first specific angle α [°] on the rotation direction side of the inner rotor 232 with respect to the reference point BP, one more first point PO1 appears. Also, at the position of 180 [°] on the rotation direction side of the inner rotor 232 with respect to the reference point BP, one more first point PO1 appears. Thus, when the inner rotor 232 and the outer rotor 233 move from the rotation angle A to the rotation angle B, in the lower land, the number of the first points PO1 increases by two, and accordingly, the number of divisions of each chamber 234 also increases by two to become twelve.

[0037] Also, as shown in FIG. 5, at the rotation angle C, when each chamber 234 is divided by a connecting line connecting the center point O and the first point PO1 with the first point PO1 as the dividing point, the number of the divided chambers 234 is ten. At this time, the number of the first points PO1 is ten.

[0038] As can be understood by comparing FIGS. 4 and 5, when the inner rotor 232 and the outer rotor 233 move from the rotation angle B to the rotation angle C, the first point PO1 at the position of the second specific angle α' [°] on the side opposite to the rotation direction of the inner rotor 232 with respect to the reference point BP decreases by one. Also, the first point PO1 at the position of 180 [°] on the rotation direction side of the inner rotor 232 with respect to the reference point BP decreases by one.

[0039] Thus, when the inner rotor 232 and the outer rotor 233 move from the rotation angle B to the rotation angle C, in the lower land, the number of the first points PO1 decreases by two, and accordingly, the number of divisions of each chamber 234 also decreases by two to become ten.

[0040] As can be understood by looking at the example shown in FIG. 4, at a position 180° on the rotation direction side of the inner rotor 232 with respect to the reference point BP, the first point PO1 increases or decreases by one according to the rotation angles of the inner rotor 232 and the outer rotor 233. Therefore, in the present embodiment, a second point is set as a dividing point at a position on the inner peripheral surface of the outer rotor 233 located on the extension line connecting the center point O and the apex of the outer teeth 232a of the inner rotor 232.

[0041] FIG. 6 is a schematic configuration diagram showing the states of the first point and the second point of the inner rotor 232 and the outer rotor 233 at a predetermined rotation angle A. FIG. 7 is a schematic configuration diagram showing the states of the first point and the second point of the inner rotor 232 and the outer rotor 233 at a predetermined rotation angle B. FIG. 8 is a schematic configuration diagram showing the states of the first point and the second point of the inner rotor 232 and the outer rotor 233 at a predetermined rotation angle C. In FIGS. 6, 7, and 8, the first point is indicated by a black circle PO1, and the second point is indicated by a white circle PO2 with a cross marked inside.

[0042] As shown in FIG. 6, when each chamber 234 is divided by a connecting line connecting the center point O and the first point PO1 and a connecting line connecting the center point O and the second point PO2 at the rotation angle A, the number of each divided chamber 234 is 18. Note that at the position where the first point PO1 and the second point PO2 on the upper land overlap, it is assumed that there are minute chambers 234 divided by a connecting line connecting the first point PO1 and the center point O and a connecting line connecting the second point PO2 and the center point O. At this time, the total number of the first point PO1 and the second point PO2 is 18. Note that the second point PO2 is derived by calculating the positions and rotation angles of the inner rotor 232 and the outer rotor 233.

[0043] Also, as shown in FIG. 7, when each chamber 234 is divided by a connecting line connecting the center point O and the first point PO1 and a connecting line connecting the center point O and the second point PO2 at the rotation angle B, the number of each divided chamber 234 is 19. At this time, the total number of the first point PO1 and the second point PO2 is 19. In FIG. 7, the second point PO2 is located at a position of 180 [°] on the rotation direction side of the inner rotor 232 with respect to the reference point BP. At this time, at the second point PO2, the first point PO1 is generated as a contact point where the inner rotor 232 and the outer rotor 233 contact, but the first point PO1 is invalidated without being used as a dividing point. That is, when the first point PO1 and the second point PO2 overlap at the position of 180 [°], the first point PO1 that overlaps with the second point PO2 is invalidated without being used as a dividing point. The same applies to FIG. 10 described later.

[0044] As can be understood by comparing FIGS. 6 and 7, when the inner rotor 232 and the outer rotor 233 move from the rotation angle A to the rotation angle B, at the position of the first specific angle α [°] on the rotation direction side of the inner rotor 232 with respect to the reference point BP, the number of the first points PO1 increases by one. In this way, when the inner rotor 232 and the outer rotor 233 move from the rotation angle A to the rotation angle B, on the lower land, the number of the first points PO1 increases by one, and accordingly, the number of divisions of each chamber 234 also increases by one and becomes 19.

[0045] Also, as shown in FIG. 8, when each chamber 234 is divided by a connecting line connecting the center point O and the first point PO1 and a connecting line connecting the center point O and the second point PO2 at the rotation angle C, the number of each divided chamber 234 is 18. At this time, the total number of the first point PO1 and the second point PO2 is 18.

[0046] As can be understood by comparing FIGS. 7 and 8, when the inner rotor 232 and the outer rotor 233 move from the rotation angle B to the rotation angle C, the number of the first points PO1 at the position of the second specific angle α’ [°] on the side opposite to the rotation direction of the inner rotor 232 with respect to the reference point BP decreases by one. In this way, when the inner rotor 232 and the outer rotor 233 move from the rotation angle B to the rotation angle C, in the lower land, the number of the first points PO1 decreases by one, and accordingly, the number of divisions of each chamber 234 also decreases by one and becomes 18. Therefore, when the first point PO1 and the second point PO2 are set as the dividing points, the increase or decrease number of each chamber 234 can be reduced to one as compared with the case where only the first point PO1 is set as the dividing point. However, since the number of divisions of each chamber 234 still varies, it becomes difficult to accurately predict the rotor behavior and the oil behavior of the oil pump 230. Therefore, in the present embodiment, in addition to the first point PO1 and the second point PO2, a third point that changes according to the angle between the reference point BP and each second point PO2 is set as the dividing point. Note that the third point PO3 is set at a position on the inner peripheral surface of the outer rotor 233, similarly to the second point PO2.

[0047] FIG. 9 is a schematic configuration diagram showing the states of the first point, the second point, and the third point of the inner rotor 232 and the outer rotor 233 at a predetermined rotation angle A. FIG. 10 is a schematic configuration diagram showing the states of the first point, the second point, and the third point of the inner rotor 232 and the outer rotor 233 at a predetermined rotation angle B. FIG. 11 is a schematic configuration diagram showing the states of the first point, the second point, and the third point of the inner rotor 232 and the outer rotor 233 at a predetermined rotation angle C. In FIGS. 9, 10, and 11, the first point is indicated by a black circle PO1, the second point is indicated by a white circle PO2 with a cross inside, and the third point is indicated by a white circle PO3.

[0048] As shown in Fig. 9, when each chamber 234 is divided by the connecting line between the center point O and the first point PO1, the connecting line between the center point O and the second point PO2, and the connecting line between the center point O and the third point PO3 at the rotation angle A, the number of each divided chamber 234 is 26. Note that at the position where the first point PO1, the second point PO2, and the third point PO3 on the upper land overlap, it is assumed that there are minute chambers 234 divided by the connecting lines connecting each of the first point PO1, the second point PO2, and the third point PO3 to the center point O. At this time, the total number of the first point PO1, the second point PO2, and the third point PO3 is 26. In this embodiment, the total number of the first point PO1, the second point PO2, and the third point PO3 is 26, but this total number changes according to the number of teeth of the inner rotor 232 and the outer rotor 233. The total number of the first point PO1, the second point PO2, and the third point PO3 is derived by the formula of the number of teeth of the outer rotor 233 × 3 - 1. For example, in this embodiment, since the number of teeth of the outer rotor 233 is 9, the total number is 26 by 9 × 3 - 1.

[0049] As shown in Fig. 10, when each chamber 234 is divided by the connecting line between the center point O and the first point PO1, the connecting line between the center point O and the second point PO2, and the connecting line between the center point O and the third point PO3 at the rotation angle B, the number of each divided chamber 234 is 26. At this time, the total number of the first point PO1, the second point PO2, and the third point PO3 is 26.

[0050] Here, comparing Fig. 9 and Fig. 10, the case where the inner rotor 232 and the outer rotor 233 move from the rotation angle A to the rotation angle B will be described. When moving from the rotation angle A to the rotation angle B, at the position of the first specific angle α [°] on the rotation direction side of the inner rotor 232 with respect to the reference point BP, the first point PO1 increases by one and the third point PO3 decreases by one.

[0051] In FIG. 10, at the position of the first specific angle α [°], the first point PO1 and the third point PO3 overlap. However, when the first point PO1 and the third point PO3 overlap, the third point PO3 that overlaps with the first point PO1 is not used as a division point and is invalidated. That is, when the first point PO1 and the third point PO3 overlap, the two overlapping division points are regarded as one division point. Therefore, as described above, at the position of the first specific angle α [°], the number of the first points PO1 increases by one, and the number of the third points PO3 decreases by one. As a result, the number of each divided chamber 234 remains 26 for the rotation angle A and the rotation angle B, and the total number of the first point PO1, the second point PO2, and the third point PO3 also remains 26.

[0052] As shown in FIG. 11, when each chamber 234 is divided by the connection line connecting the center point O and the first point PO1, the connection line connecting the center point O and the second point PO2, and the connection line connecting the center point O and the third point PO3 at the rotation angle C, the number of each divided chamber 234 is 26. At this time, the total number of the first point PO1, the second point PO2, and the third point PO3 is 26.

[0053] Here, FIGS. 10 and 11 are compared, and the case where the inner rotor 232 and the outer rotor 233 move from the rotation angle B to the rotation angle C will be described. When moving from the rotation angle B to the rotation angle C, at the position of the second specific angle α' [°] on the side opposite to the rotation direction of the inner rotor 232 with respect to the reference point BP, the number of the first points PO1 decreases by one, and the number of the third points PO3 increases by one.

[0054] In FIG. 10, at the position of the second specific angle α’ [°], the first point PO1 and the third point PO3 overlap. However, when the first point PO1 and the third point PO3 overlap, the third point PO3 that overlaps with the first point PO1 is not used as a division point and is invalidated. That is, when the first point PO1 and the third point PO3 overlap, the two overlapping division points are regarded as one division point. Also, when the first point PO1 and the third point PO3 no longer overlap, the third point PO3 that does not overlap with the first point PO1 is validated and used as a division point. That is, when the first point PO1 and the third point PO3 do not overlap, each is regarded as a different division point. Therefore, as described above, at the position of the second specific angle α’ [°], the number of the first points PO1 decreases by one, and the number of the third points PO3 increases by one. As a result, in terms of the rotation angle B and the rotation angle C, the number of each chamber 234 divided remains 26, and the total number of the first point PO1, the second point PO2, and the third point PO3 also remains 26. Thus, according to this embodiment, regardless of the rotation of the inner rotor 232 and the outer rotor 233, the number of divisions of each chamber 234 can be maintained constant. Therefore, it is possible to prevent a situation where a predetermined chamber 234 that has been calculated suddenly disappears or a chamber 234 that has not been calculated suddenly appears, and to prevent an error from occurring in the calculation of the volume of each chamber 234. Also, since the number of divisions of each chamber 234 is maintained constant, it becomes possible to continuously calculate the changing volume of each chamber 234. As a result, it becomes possible to accurately predict the rotor behavior and the oil behavior of the oil pump 230.

[0055] FIG. 12 is an explanatory diagram for explaining a method of setting the third point PO3. As shown in FIG. 12, let the angle between the reference point BP and the third point PO3 be θadd [°], and the angle between the reference point BP and the second point PO2 be θintop [°]. Also, let the angle between the increasing contact point addPO1 where the first point PO1 increases and the reference point BP be α [°], and the angle between the decreasing contact point decPO1 where the first point PO1 decreases and the reference point BP be α' [°]. Note that the angle α [°] is an angle within the range of 180° on the rotation direction side of the inner rotor 232 with respect to the reference point BP. The angle α' [°] is an angle within the range of 180° on the side opposite to the rotation direction of the inner rotor 232 with respect to the reference point BP. Also, the angles α [°] and α' [°] are angles other than 180 [°].

[0056] In that case, within the range of 180° on the rotation direction side of the inner rotor 232 with respect to the reference point BP, the third point PO3 is set by the formula θadd = α / 180 · θintop. Also, within the range of 180° on the side opposite to the rotation direction of the inner rotor 232 with respect to the reference point BP, the third point PO3 is set by the formula θadd = α' / 180 · θintop.

[0057] By setting the third point PO3 in this way, at the angles α [°] and α' [°], the first point PO1 and the third point PO3 can be overlapped. And when the first point PO1 and the third point PO3 overlap, the third point PO3 that overlaps with the first point PO1 is not used as a division point and is invalidated, so that the number of each chamber 234 to be divided can be maintained without fluctuation.

[0058] In this embodiment, the analysis device 300 derives the volume of each chamber 234 divided by the connection line between the first point PO1 and the center point O, the connection line between the second point PO2 and the center point O, and the connection line between the third point PO3 and the center point O. The volume of each chamber 234 is sequentially derived according to the rotation angles of the inner rotor 232 and the outer rotor 233. In this embodiment, since the number of divisions of each chamber 234 is maintained without change according to the rotation angles of the inner rotor 232 and the outer rotor 233, the changing volume of each chamber 234 can be accurately and continuously derived. Therefore, the analysis device 300 sequentially derives with high precision the volume change of each chamber 234 according to the rotation angles of the inner rotor 232 and the outer rotor 233.

[0059] Further, the analysis device 300 derives the clearance amount between each chamber 234 by calculating the positions and rotation angles of the inner rotor 232 and the outer rotor 233. Further, the analysis device 300 derives the overlapping area where each chamber 234 overlaps with the suction port 231a, the main discharge port 231b, and the sub-discharge port 231c. The overlapping area is sequentially derived according to the rotation angles of the inner rotor 232 and the outer rotor 233. Therefore, the analysis device 300 sequentially derives the change in the overlapping area according to the rotation angles of the inner rotor 232 and the outer rotor 233. Then, the analysis device 300 derives the pressure of the oil in each chamber 234 based on the volume of each divided chamber 234 and the derived overlapping area.

[0060] FIG. 13 is a schematic configuration diagram showing an example of a model 400 for deriving the oil pressure according to this embodiment. As shown in FIG. 13, the model 400 includes a plurality of cylinders 410, a plurality of pistons 420, a first variable throttle 430, a second variable throttle 440, a third variable throttle 450, and a fourth variable throttle 460.

[0061] In the model 400, the volume of each divided chamber 234 is used as the volume of the space between each cylinder 410 and the piston 420. Further, the clearance amount between adjacent chambers 234 is used as the throttle amount of the first variable throttle 430.

[0062] Also, as the aperture amount of the second variable aperture 440, the overlapping area where each chamber 234 and the suction port 231a overlap is used. As the aperture amount of the third variable aperture 450, the overlapping area where each chamber 234 and the main discharge port 231b overlap is used. As the aperture amount of the fourth variable aperture 460, the overlapping area where each chamber 234 and the sub-discharge port 231c overlap is used.

[0063] By using the model 400, the inflow amount and outflow amount of oil into each chamber 234 can be derived. At this time, the pressure loss and flow rate change of the piping parts in the suction passage 220, the main discharge passage 240, the sub-discharge passage 250, and the confluence passage 260 may be derived. Since the volume change of each chamber 234 can be continuously derived and the inflow amount and outflow amount of oil into each chamber 234 can be derived, the pressure change of the oil in each chamber 234 can be continuously derived with high precision.

[0064] FIG. 14 is a flowchart of an example of the control process of the analysis device 300 according to the present embodiment. The flow in FIG. 14 is executed each time the rotation angles of the inner rotor 232 and the outer rotor 233 change. As shown in FIG. 14, first, the setting unit 300a sets the first point PO1 where the inner rotor 232 and the outer rotor 233 contact as a dividing point (step S100). Next, the setting unit 300a sets the second point PO2 located on the inner peripheral surface of the outer rotor 233 located on the extension line connecting the center point O of the inner rotor 232 and each vertex of the outer teeth 232a as a dividing point (step S110). Then, the setting unit 300a sets the third point PO3 that changes according to the angle between the reference point BP and the second point PO2 on the inner peripheral surface of the outer rotor 233 as a dividing point (step S120).

[0065] Then, the setting unit 300a determines whether the first point PO1 and the third point PO3 overlap (step S130). When the first point PO1 and the third point PO3 overlap (step S130: YES), the setting unit 300a invalidates the third point PO3 that overlaps the first point PO1 without using it as a dividing point (step S140). On the other hand, when the first point PO1 and the third point PO3 do not overlap (step S130: NO), the setting unit 300a validates the third point PO3 as a dividing point and uses each of the first point PO1 and the third point PO3 as a dividing point (step S150). The dividing unit 300b divides each chamber 234 by a connecting line connecting each dividing point of the first point PO1, the second point PO2, and the third point PO3 and the center point O (step S160). At this time, when the first point PO1 and the third point PO3 overlap, the dividing unit 300b divides each chamber 234 without using the third point PO3 that overlaps the first point PO1 as a dividing point.

[0066] The deriving unit 300c derives the volume of each chamber 234 divided by the first point PO1, the second point PO2, and the third point PO3 (step S170). Further, the deriving unit 300c derives the overlapping area where each chamber 234 overlaps with the suction port 231a, the main discharge port 231b, and the sub discharge port 231c (step S180). Then, the deriving unit 300c uses the model 400 to derive the pressure of each chamber 234 based on the derived volume and overlapping area (step S190). By continuously deriving the volume change and overlapping area of each chamber 234 according to the rotation angles of the inner rotor 232 and the outer rotor 233 by the deriving unit 300c, the pressure change of each chamber 234 can be continuously derived. As a result, the rotor behavior and oil behavior of the oil pump 230 can be accurately predicted.

[0067] As described above, the preferred embodiments of the present invention have been described with reference to the accompanying drawings. Needless to say, the present invention is not limited to such embodiments. It is obvious that those skilled in the art can conceive various modification examples or correction examples within the scope described in the claims, and it is naturally understood that they also belong to the technical scope of the present invention.

[0068] Note that the series of processes performed by each device (e.g., the analysis device 300) according to the above-described embodiment may be realized using any of software, hardware, or a combination of software and hardware. The program constituting the software is pre-stored, for example, in a non-transitory storage medium provided inside or outside each device. Then, the program is read from the non-transitory storage medium (e.g., ROM) into a temporary storage medium (e.g., RAM) and executed by a processor such as a CPU.

[0069] It is possible to create a program for realizing each function of each of the above devices and install it in the computer of each of the above devices. By the processor executing the program stored in the memory, the processing of each of the above functions is executed. At this time, the program may be executed in a shared manner by a plurality of processors, or the program may be executed by one processor. Further, each function of each of the above devices may be realized by cloud computing using a plurality of computers interconnected by a communication network.

[0070] Note that the program may be provided to and installed in the computer of each device by distribution from an external device through a communication network. Alternatively, the program may be stored in a non-transitory computer readable medium readable by a computer and provided to and installed in the computer of each device via the storage medium.

[0071] Also, according to the present embodiment, it is possible to provide a program for executing the processing of each function of each of the above devices. Furthermore, it is also possible to provide a computer-readable non-transitory storage medium in which the program is stored. The non-transitory storage medium may be, for example, a disk-type storage medium such as an optical disk, a magnetic disk, or a magneto-optical disk, or may be a semiconductor memory such as a flash memory or a USB memory.

Explanation of Signs

[0072] 100 Analysis system 230 Oil pump 231a Suction port 231b Main discharge port 231c Sub-discharge port 232 Inner rotor 233 Outer rotor 234 Chamber 300 Analyzer 300a Setting unit 300b Division unit 300c Derivation unit PO1 First point PO2 Second point PO3 Third point

Claims

1. One or more processors, One or more memories connected to the processor, Having, The processor is, Setting the first point where the inner rotor and the outer rotor of the pump contact as the dividing point, Setting the second point on the outer rotor located on the extension line connecting the center of the inner rotor and each vertex as the dividing point, Setting the third point that changes according to the angle between the reference point and the second point as the dividing point, Dividing the chamber between the inner rotor and the outer rotor with a connection line connecting the first point, the second point, the third point, and the center of the inner rotor, When the first point and the third point overlap, dividing the chamber without using the third point that overlaps with the first point as the dividing point, Executing a process including, Analysis device.

2. The processor is, When the angle between the reference point and the third point is θadd, the angle between the reference point and the second point is θintop, the angle between the increasing contact point where the contact point between the inner rotor and the outer rotor increases due to the rotation of the inner rotor and the outer rotor and the reference point is α, and the angle between the decreasing contact point where the contact point between the inner rotor and the outer rotor decreases due to the rotation of the inner rotor and the outer rotor and the reference point is α', In the range up to 180° on the rotation direction side of the inner rotor with respect to the reference point, θadd = α / 180 · θintop To set the third point, In the range up to 180° on the side opposite to the rotation direction of the inner rotor with respect to the reference point, θadd = α' / 180 · θintop To set the third point, Executing a process including, The analysis device according to claim 1.

3. The processor is, Deriving the volume of each chamber divided by the first point, the second point, and the third point, Deriving the area where each chamber overlaps with the suction port and the discharge port of the pump, Deriving the pressure of each chamber based on the volume and the area, Executing a process including, The analysis device according to claim 1 or 2.

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