JP2017002740A - Variable displacement oil pump control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve fuel efficiency by appropriately setting a threshold to switch between a half discharge state and a full discharge state.SOLUTION: A variable displacement oil pump control device comprises: a storage section which stores determination information to identify a threshold to switch between a half discharge state and a full discharge state depending on an engine rotation speed; a determination information update section which updates the determination information stored in the storage section on the basis of actual measurement values of the engine rotation speed and discharge output at the engine rotation speed; and an output switching section which identifies the threshold on the basis of the determination information stored in the storage section and the engine rotation speed and switches between the half discharge state and the full discharge state depending on whether or not a demand value of discharge output is not less than the identified threshold.SELECTED DRAWING: Figure 9

Description

  The present invention mainly relates to a control device for a variable displacement oil pump mounted on a vehicle.

  Conventionally, for example, an oil pump disclosed in Patent Document 1 is known. This oil pump is a so-called internal gear pump, in which an inner rotor having teeth on the outer peripheral surface and an outer rotor having teeth on the inner peripheral surface are engaged with each other to engage the inner rotor and the outer rotor. The hydraulic oil that has flowed into the gap is compressed and sent out.

  The oil pump described in Patent Document 1 is a so-called variable displacement type, and two discharge ports are provided to control the discharge flow rate. Then, a half-discharge state in which only hydraulic oil discharged from one discharge port is supplied to a hydraulic supply target such as a hydraulic mechanism, and a full discharge state in which hydraulic oil discharged from both discharge ports is supplied to the hydraulic supply target are switched. A mechanism is provided. The half-discharge state and the full-discharge state are switched according to the required value of the hydraulic oil discharge output (discharge flow rate and discharge hydraulic pressure).

JP 2013-148205 A

  Since the oil pump is driven by the rotational power of the engine, the discharge output of the oil pump becomes a value corresponding to the engine speed. In view of this, the oil pump is controlled such that when the required discharge output exceeds the dischargeable output that can be discharged in the half discharge state with respect to the engine speed, the discharge state is fully discharged. At this time, the threshold value of the discharge output for switching between the half-discharge state and the full-discharge state has a fluctuation width with respect to an appropriate value to be originally set due to the influence of variations in individual parts of the oil pump.

  For this reason, it is necessary to ensure that any individual can be switched to the full discharge state by setting the lower limit side of the fluctuation width of the appropriate value as a threshold value. As a result, even if the oil pump has high discharge performance in the half discharge state and has an appropriate value on the upper limit side of the threshold fluctuation width, a threshold value lower than the appropriate value is set. In other words, the required value of the discharge output that can be covered in the half discharge state is switched to the full discharge state, and there is room for improvement in fuel consumption.

  Therefore, an object of the present invention is to provide a control device for a variable displacement oil pump that can appropriately set a threshold value for switching between a half-discharge state and a full-discharge state and can improve fuel consumption.

  In order to solve the above-described problem, the control device for a variable displacement oil pump according to the present invention has two discharge ports, a semi-discharge state in which hydraulic oil is discharged from one of the two discharge ports at a pressure higher than the other, Threshold for switching between the semi-discharge state and the full-discharge state, in which hydraulic oil is discharged from both of the two discharge ports, and the full-discharge state corresponding to the engine speed is larger than that in the half-discharge state. The determination information stored in the storage unit is updated based on the storage unit that stores determination information for specifying the engine speed according to the engine speed, and the measured value of the engine output and the discharge output at the engine speed. The threshold value is specified based on the determination information update unit that performs the determination information stored in the storage unit, and the engine speed, and the required value of the discharge output is equal to or greater than the specified threshold value Depending on whether, characterized in that it comprises an output switching unit for switching between the semi-discharge state and full discharge condition, the.

  The determination information update unit may measure the dischargeable output and obtain the actual measurement value by setting the target value of the discharge output higher than the required value of the discharge output in the half discharge state.

  The determination information is a calculation formula including at least an equation for multiplying the engine speed by a predetermined coefficient, and the determination information update unit may update a storage coefficient that is a coefficient of the calculation formula stored in the storage unit. Good.

  The determination information updating unit derives a temporary coefficient based on the engine speed and the actual measured value of the discharge output at the engine speed, and updates the storage coefficient based on the comparison result between the derived temporary coefficient and the stored coefficient. May be.

  The determination information updating unit may update the storage coefficient when the difference between the storage coefficient and the provisional coefficient is outside a predetermined fluctuation error range.

  The determination information update unit may store the temporary coefficient as the storage coefficient when the temporary coefficient is larger than the storage coefficient.

  When the provisional coefficient is larger than the storage coefficient, the determination information update unit may update the storage coefficient stored in the storage unit to a value obtained by adding a predetermined addition value to the storage coefficient.

  When the provisional coefficient is smaller than the storage coefficient, the determination information update unit may update a predetermined subtraction value larger than the addition value to a value obtained by subtracting from the storage coefficient stored in the storage unit.

  The determination information update unit may store the temporary coefficient as the storage coefficient when the temporary coefficient is smaller than the storage coefficient.

  The determination information may be set for each of a plurality of preset oil temperature regions.

  According to the present invention, it is possible to appropriately set the threshold value for switching between the half discharge state and the full discharge state, and to improve fuel consumption.

It is a disassembled perspective view of the housing, rotary body, and cover which comprise the control apparatus of a variable capacity oil pump. It is a front view of a housing, a rotary body, and a cover. (A) is a front view of the housing which accommodated the rotary body in the accommodation hole, (b) is the housing of which the rotary body was permeate | transmitted and the suction port, the 1st discharge port, and the 2nd discharge port were shown integrally. It is a front view. It is a 1st figure for demonstrating the hydraulic fluid circuit of a variable capacity oil pump. It is a 2nd figure for demonstrating the hydraulic fluid circuit of a variable capacity oil pump. It is explanatory drawing which shows the relationship between the threshold value which switches a half discharge state and a full discharge state, and an engine speed. It is explanatory drawing for demonstrating the dispersion | variation in discharge performance. It is explanatory drawing for demonstrating the learning process at the time of engine starting. It is explanatory drawing for demonstrating the learning process of an engine stable period. It is a flowchart which shows the schematic flow of the learning process at the time of engine starting. It is a flowchart which shows the schematic flow of the learning process in an engine stable period. It is a flowchart which shows the rough flow of the learning process in an engine starting time learning process and an engine stable period learning process. It is a flowchart which shows the flow of a rough process of the learning process in a modification.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in the 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 illustrated. To do.

  FIG. 1 is an exploded perspective view of a housing 2, a rotating body 3, and a cover 4 that constitute a variable displacement oil pump 1. A variable capacity oil pump 1 shown in FIG. 1 is a so-called internal gear pump, and a rotating body 3 is accommodated in a casing 5 formed by a housing 2 and a cover 4.

  The housing 2 and the cover 4 accommodate the rotating body 3, and are fastened by a fastening member (not shown) in a state where the facing surface 2a of the housing 2 and the facing surface 4a of the cover 4 are in contact with each other.

  2 is a front view of the housing 2, the rotating body 3, and the cover 4. FIG. 2 (a) shows the facing surface 2a side of the housing 2, and FIG. FIG. 2C shows the facing surface 4a side of the cover 4.

  As shown in FIG. 2A, a housing hole 6 in which the rotating body 3 is housed is provided in the facing surface 2 a of the housing 2. The housing hole 6 is configured by a hole having a circular cross section that is recessed from the facing surface 2 a of the housing 2 in the direction of the rotation axis of the rotating body 3, and in the state of being closed by the cover 4, the inside of the housing hole 6 is a hydraulic chamber. 7

  The rotating body 3 is rotatably accommodated in the hydraulic chamber 7 and rotates in response to the rotational power of the engine. As shown in FIG. 2B, the rotating body 3 includes an inner rotor 3b having a plurality of external teeth 3a on the outer peripheral surface and an outer rotor 3d having a plurality of inner teeth 3c on the inner peripheral surface. Is done. A plurality of gaps between the inner rotor 3b and the outer rotor 3d form a pump chamber 8, and the rotating body 3 divides the hydraulic chamber 7 in the rotation direction (counterclockwise direction in FIG. 2B) and pumps it. A chamber 8 is formed.

  The inner rotor 3b is inserted through a shaft (not shown) that rotates with the power of the engine, and rotates integrally with the shaft. The outer teeth 3a have one fewer tooth than the inner teeth 3c, and the inner rotor 3b and the outer rotor 3d are meshed with each other in an eccentric manner. When the inner rotor 3b rotates in the direction indicated by the solid line in FIG. 2B, the outer rotor 3d also rotates together. At this time, the plurality of pump chambers 8 sequentially repeat reduction and enlargement. Become.

  A housing side suction port 9a, a housing side first discharge port 10a (discharge port), and a housing side second discharge port 11a (discharge port) are provided on the bottom surface 6a of the accommodation hole 6 formed in the housing 2. Yes. The housing-side suction port 9a, the housing-side first discharge port 10a, and the housing-side second discharge port 11a formed in the housing 2 are all configured by depressions provided in the bottom surface 6a, and the rotation direction of the rotating body 3 (FIG. 2). The housing side suction port 9a, the housing side first discharge port 10a, and the housing side second discharge port 11a are arranged in this order while maintaining a space therebetween (indicated by a broken arrow in (a)).

  Further, of the facing surface 4a of the cover 4, the facing portion 4b facing the accommodation hole 6 has a cover side suction port 9b, a cover side first discharge port 10b (discharge port), and a cover side second discharge port 11b (discharge). Port). The cover-side suction port 9b, the cover-side first discharge port 10b, and the cover-side second discharge port 11b formed in the cover 4 are all constituted by through holes that penetrate the cover 4, and the rotation direction of the rotating body 3 (see FIG. The cover side suction port 9b, the cover side first discharge port 10b, and the cover side second discharge port 11b are arranged in this order while maintaining a distance from each other at 2 (c) (indicated by a dashed arrow).

  The housing-side suction port 9a and the cover-side suction port 9b are formed at positions facing the rotation axis direction of the rotating body 3, and the housing-side first discharge port 10a, the cover-side first discharge port 10b, and the housing-side suction port The second discharge port 11a and the cover-side second discharge port 11b are also arranged to face each other in the direction of the rotation axis of the rotating body 3. Hereinafter, the housing side suction port 9a and the cover side suction port 9b are collectively referred to as a suction port 9, and the housing side first discharge port 10a and the cover side first discharge port 10b are collectively referred to as a first discharge port 10. The housing-side second discharge port 11a and the cover-side second discharge port 11b may be collectively referred to as the second discharge port 11.

  3A is a front view of the housing 2 in which the rotating body 3 is accommodated in the accommodation hole 6. FIG. 3B is a perspective view of the suction port 9, the first discharge port 10, and the first discharge port 10 through the rotating body 3. FIG. It is a front view of the housing 2 which showed the 2 discharge port 11 integrally. The suction port 9 opens in the hydraulic chamber 7 in a range in which the pump chamber 8 expands in volume as the rotating body 3 rotates, and guides hydraulic oil to the pump chamber 8 by a negative pressure action due to volume expansion. The first discharge port 10 and the second discharge port 11 are behind the suction port 9 in the rotation direction of the rotator 3 (indicated by solid arrows in FIG. 3), and the pump chamber 8 is rotated with the rotation of the rotator 3. Is opened in a range in which the volume is reduced, and hydraulic oil in the pump chamber 8 compressed by the compression action due to the volume reduction is discharged.

  2 and 3, when the housing 2 and the cover 4 are assembled, a suction passage 21 is provided radially outward of the accommodation hole 6 (hydraulic chamber 7) in which the rotating body 3 is accommodated. A first joining passage 22 and a second joining passage 23 are provided. The suction passage 21 communicates with the housing side suction port 9 a inside the housing 2. Similarly, the first joining passage 22 communicates with the housing-side first discharge port 10a inside the housing 2, and the second joining passage 23 communicates with the housing-side second discharge port 11a. The suction passage 21, the first joining passage 22, and the second joining passage 23 extend in the direction of the rotation axis of the rotating body 3 in a state where the housing 2 and the cover 4 are assembled. The suction passage 21, the first joining passage 22, and the second joining passage 23 are all closed at one end on the housing 2 side, whereas the end on the cover 4 side passes through the cover 4. Yes.

  That is, the housing 2 is formed with recesses that constitute the suction passage 21, the first joining passage 22, and the second joining passage 23, and the cover 4 is at a position facing the recess formed in the housing 2. A through-hole constituting the suction passage 21, the first joining passage 22, and the second joining passage 23 is formed. Accordingly, the hydraulic oil discharged from the housing-side first discharge port 10a in the housing 2 is guided to the cover 4 side via the first junction passage 22, and in the housing 2, from the housing-side second discharge port 11a. The discharged hydraulic oil is guided to the cover 4 side through the second merge passage 23.

  Although detailed description is omitted, the surface of the cover 4 opposite to the facing surface 4a is fixed to the engine body. The engine body includes a flow path (a suction flow path 100 and a first flow path described later) connected to a cover side suction port 9b, a cover side first discharge port 10b, and a cover side second discharge port 11b formed in the cover 4, respectively. A supply path 110 and a second supply path 120) are formed. The suction flow path 100 connected to the cover side suction port 9 b is also connected to the suction passage 21. The first supply path 110 connected to the cover-side first discharge port 10b is also connected to the first junction path 22, and the second supply path 120 connected to the cover-side second discharge port 11b is The second junction passage 23 is also connected.

  Accordingly, the hydraulic fluid flowing through the suction flow path 100 is guided to the cover side suction port 9b and also to the housing side suction port 9a through the suction passage 21. The hydraulic oil discharged from the housing-side first discharge port 10a is guided to the cover 4 side via the first merging passage 22 and then merged with the hydraulic oil discharged from the cover-side first discharge port 10b. Thus, the hydraulic oil is supplied to a hydraulic oil supply destination (a hydraulic mechanism 130 and a lubrication target 132 described later). Similarly, the hydraulic oil discharged from the housing-side second discharge port 11a is guided to the cover 4 side via the second merging passage 23 and then merged with the hydraulic oil discharged from the cover-side second discharge port 11b. Then, it is supplied to the supply destination.

  As described above, the variable capacity oil pump 1 from which the hydraulic oil is discharged from both the first discharge port 10 and the second discharge port 11 has the required discharge output (discharge flow rate and discharge pressure) required by the supply destination. Accordingly, the operation state is switched between the half discharge state and the full discharge state. Specifically, when the required discharge output value of the supply destination is lower than a preset threshold value, the operation state is switched to the half discharge state, and only the hydraulic oil discharged from the first discharge port 10 is supplied. To supply. And the hydraulic fluid discharged from the 2nd discharge port 11 is supplied to each site | part as lubricating oil, or circulates to a tank. On the other hand, when the required pressure at the supply destination is equal to or greater than the threshold, the operation state is switched to the full discharge state, and the hydraulic oil discharged from the second discharge port 11 is merged with the hydraulic oil discharged from the first discharge port 10. And supply it to the supplier. Thus, energy loss can be reduced by switching the operation state to either the half discharge state or the full discharge state.

  4 and 5 are diagrams for explaining the hydraulic oil circuit of the variable displacement oil pump 1. FIG. 4 shows the hydraulic oil circuit of the variable displacement oil pump 1 in the full discharge state, and FIG. The hydraulic oil circuit of the variable capacity oil pump 1 in a semi-discharge state is shown. In FIG. 4 and FIG. 5, the flow path of hydraulic oil toward the hydraulic mechanism 130 at high pressure is indicated by a thick arrow.

  As shown in FIG. 4, the hydraulic oil discharged from the variable displacement oil pump 1 is supplied to the transmission hydraulic mechanism 130 and the lubrication target 132. The hydraulic mechanism 130 operates various parts with the hydraulic pressure (line pressure) of the supplied hydraulic oil, and performs a shift by the operation of these parts. The lubrication target 132 is a lubrication part of each component in the transmission. In the lubrication target 132, the supplied hydraulic oil functions as the lubrication oil. The hydraulic pressure for supplying hydraulic oil to the lubrication target 132 may be lower than the hydraulic pressure of the hydraulic oil supplied to the hydraulic mechanism 130.

  The first supply path 110 connects the first discharge port 10 and the hydraulic mechanism 130, and guides hydraulic oil discharged from the first discharge port 10 to the hydraulic mechanism 130.

  In addition, a first branch path 112 that branches from the first supply path 110 is formed, and the hydraulic oil that flows into the first branch path 112 from the first supply path 110 enters the second supply path 120 that leads to the lubrication target 132. It flows in and a part is guided to the lubrication target 132. On the other hand, the second supply path 120 branches to a second branch path 122 connected to the tank T, and the hydraulic oil that has flowed into the second branch path 122 from the second supply path 120 circulates in the tank T. The tank T is connected to the suction flow path 100 communicating with the suction port 9 via the strainer 134, and the hydraulic oil filtered by the strainer 134 is connected to the hydraulic chamber 7 via the suction flow path 100 and the suction port 9. To the pump chamber 8.

  A control valve 136 is provided in the first branch path 112. The first branch path 112 connects the first supply path 110 and the upstream side of the second supply path 120 with respect to the branch portion of the second branch path 122. The pressure of the second supply path 120 is lower than that of the first supply path 110, and the hydraulic oil flows through the first branch path 112 from the first supply path 110 side toward the second supply path 120 side.

  The control valve 136 changes the opening according to the hydraulic pressure (pilot pressure) of the pilot line 140. The linear solenoid 142 is composed of, for example, an electromagnet, and variably controls the pilot pressure according to the current value.

  When the flow path width of the first branch path 112 is narrowed by the control valve 136, the flow rate of the hydraulic oil flowing from the first supply path 110 into the first branch path 112 decreases, the hydraulic pressure in the first supply path 110 increases, and the hydraulic pressure The hydraulic pressure acting on the mechanism 130 increases. Conversely, when the flow path width of the first branch path 112 is increased by the control valve 136, the flow rate of the hydraulic oil flowing from the first supply path 110 into the first branch path 112 increases, and the hydraulic pressure in the first supply path 110 decreases. As a result, the hydraulic pressure acting on the hydraulic mechanism 130 decreases.

  That is, the control valve 136 regulates the hydraulic oil discharged to the first supply path 110 and supplies it to the hydraulic mechanism 130, and guides excess hydraulic oil to the second supply path 120 through the first branch path 112. ing.

  Further, a pressure regulating valve 138 is provided in the second branch path 122. The pressure regulating valve 138 maintains the pressure on the second supply path 120 side at a constant pressure. In the second supply path 120, an orifice 144 is provided between the second branch path 122 and the lubrication target 132 to keep the supply pressure to the lubrication target 132 constant. In this way, the pressure of the second supply path 120 is kept constant by the pressure adjustment valve 138, and hydraulic oil is supplied to the lubrication target 132 through the orifice 144, and excess hydraulic oil circulates to the tank T.

  The merge oil passage 126 is connected to the upstream side of the connection portion with the first branch passage 112 in the first supply passage 110. The port switching valve 146 is disposed in the second supply path 120 and guides the hydraulic oil discharged from the second discharge port 11 to the first supply path 110 via the merged oil path 126. And a two-position three-port valve that can be switched to a second switching position for guiding the hydraulic oil discharged from the second discharge port 11 to the lubrication target 132 via the second supply path 120.

  In FIG. 4, the port switching valve 146 is in a first switching position that connects the second discharge port 11 and the merging oil passage 126, and in FIG. 5, the second discharge port 11 and the second supply passage 120 are connected to each other. It is the 2nd switching position to connect.

  As shown in FIG. 4, the combined oil passage 126 connects the second discharge port 11 and the first supply passage 110 in the full discharge state in which the port switching valve 146 is in the first switching position. At this time, the hydraulic oil discharged from the second discharge port 11 is guided to the hydraulic mechanism 130 via the second supply path 120, the merged oil path 126, and the first supply path 110.

  On the other hand, as shown in FIG. 5, in the semi-discharge state, the port switching valve 146 is in the second switching position, and the hydraulic oil discharged from the second discharge port 11 is lubricated via the second supply path 120. 132.

  As described above, the second discharge port 11 is connected to at least one of the hydraulic mechanism 130 and the lubrication target 132.

  The control device 148 controls the linear solenoid 142 according to the output value from the sensor 150a such as an engine speed sensor, an oil temperature sensor, a throttle opening sensor, a vehicle speed sensor, a T / M rotation sensor, and the line pressure sensor 150b. To do. Here, the line pressure indicates the hydraulic pressure of the hydraulic oil supplied to the hydraulic mechanism 130, and the line pressure sensor 150 b is disposed on the downstream side of the connection portion with the first branch path 112 in the first supply path 110. And measure the line pressure.

  Specifically, the control device 148 derives a required value (for example, required discharge pressure) of the discharge output required by the hydraulic mechanism 130 in accordance with the output value from the sensor 150a, and sets the calculated discharge output request value. The feedback control is performed on the opening degree of the control valve 136 (that is, the linear solenoid 142) so that the output value from the line pressure sensor 150b converges.

  The control device 148 includes a storage unit 148a, and functions as an output switching unit 148b and a determination information update unit 148c. The storage unit 148a stores determination information for specifying a threshold value for switching between the half-discharge state and the full-discharge state according to the engine speed. The determination information will be described in detail later.

  The output switching unit 148b controls the port switching valve 146 to switch between the semi-discharge state and the full-discharge state depending on whether or not the required discharge output value is equal to or greater than a threshold value corresponding to the engine speed.

  Comparing the full discharge state shown in FIG. 4 and the half discharge state shown in FIG. 5, in the full discharge state, the hydraulic oil discharged from the second discharge port 11 in addition to the first discharge port 10 is a hydraulic mechanism. As a result, the discharge output (discharge flow rate and discharge hydraulic pressure) increases. The output switching unit 148b controls the port switching valve 146 to control the full discharge state when the hydraulic mechanism 130 requires a high hydraulic pressure, for example, when the engine load is high, that is, when the required discharge output value is equal to or greater than a threshold value. By doing so, it becomes possible to satisfy the required value of the discharge output.

  Further, the output switching unit 148b operates to discharge from the second discharge port 11 by controlling the port switching valve 146 to be in a semi-discharge state when the required value of the discharge output is less than the threshold, such as when the engine load is low. The oil is guided to the lubrication target 132 and the tank T. At this time, since the hydraulic pressure of the second supply path 120 communicating with the second discharge port 11 is lower than that of the first supply path 110, the hydraulic pressure acting on the second discharge port 11 is lower than in the full discharge state. Thus, the driving load of the variable capacity oil pump 1 is reduced.

  FIG. 6 is an explanatory diagram showing the relationship between the threshold value for switching between the half-discharge state and the full-discharge state and the engine speed. Since the variable displacement oil pump 1 is driven by the rotational power of the engine, the discharge output of the variable displacement oil pump 1 has a value corresponding to the engine speed. That is, the dischargeable output that can be discharged in the half-discharge state is also determined according to the engine speed.

  Specifically, the dischargeable output that can be discharged in the semi-discharge state changes approximately in proportion to the engine speed. Therefore, as shown in FIG. 6A, the threshold value for switching between the half-discharge state and the full-discharge state is set to a value proportional to the engine speed at least when the engine speed is equal to or lower than the predetermined speed (engine speed). Set according to).

  Here, a calculation formula including at least a formula (calculation) for multiplying the engine speed by a predetermined coefficient is stored as determination information for specifying the threshold value for switching between the half-discharge state and the full-discharge state according to the engine speed. Stored in the unit 148a. Specifically, the determination information is a proportional expression of the engine speed, and a corresponding threshold value is derived by substituting the actual engine speed for the engine speed variable.

  The output switching unit 148b specifies a threshold based on the determination information stored in the storage unit 148a and the engine speed, and whether or not the required value of the discharge output is equal to or greater than the specified threshold. Switch between half-discharge state and full-discharge state. For example, as shown in FIG. 6 (a), the output switching unit 148b, when the engine speed is α, if the required discharge output value is equal to or greater than the threshold value β, the full discharge state, and if less than the threshold value β, half discharge The port switching valve 146 is controlled so as to be in the state.

  In addition, if the line pressure of the hydraulic mechanism 130 becomes too high, there is a possibility that the allowable hydraulic value on the hydraulic mechanism 130 side may be exceeded, so an upper limit value is set for the required discharge output value. When the engine speed becomes high, it becomes possible to cover the required value of the discharge output in the half discharge state, and the full discharge state is not selected.

  By the way, the discharge output of the variable displacement oil pump 1 is influenced by the oil temperature of the hydraulic oil in addition to the engine speed. Therefore, as shown in FIG. 6B, the oil temperature is divided into a low temperature region, a normal temperature region, and a high temperature region, and the determination information is set for each oil temperature region. In the following, the threshold values set for the normal temperature region will be described in detail, and the threshold values set for the other oil temperature regions are substantially equal to the threshold values set for the normal temperature region. The description will be omitted.

  FIG. 7 is an explanatory diagram for explaining the variation in ejection performance. The variable displacement oil pump 1 has variations in discharge performance due to the influence of variations in components and the like. As a result, as in the legends a to d shown in FIG. 7A, a difference occurs in the dischargeable output even at the same engine speed, and a difference occurs in the slope in the proportional portion up to the upper limit value of the discharge output. In the example of FIG. 7A, the discharge performance of the legend a is the lowest, and the dischargeable output in the half discharge state is low even at the same engine speed as compared to the other legends b to d. Further, the legend d has the highest discharge performance, and the dischargeable output in the half discharge state is high even at the same engine speed as compared to the other legends a to c.

  Thus, when there is variation in the discharge performance, the calculation formula is set according to the one having the lowest discharge performance. That is, a coefficient for multiplying the engine speed is set in accordance with the discharge performance of the legend a. As a result, for example, for the legend d, in the area indicated by hatching in FIG. 7B, the required value of the discharge output that could originally be covered in the half discharge state is responded in the full discharge state. End up.

  Therefore, the determination information update unit 148c illustrated in FIGS. 4 and 5 updates the determination information stored in the storage unit 148a based on the engine speed and the actual value of the discharge output at the engine speed. Specifically, the determination information update unit 148c “stores a coefficient (hereinafter referred to as a coefficient stored in the storage unit 148a) that is multiplied by the engine speed among calculation formulas that are determination information stored in the storage unit 148a. (Referred to as “coefficient”).

  Then, the determination information update unit 148c uses a coefficient (hereinafter referred to as a “provisional coefficient” as a coefficient derived by a learning process performed by the determination information update unit 148c based on the engine speed and the actually measured discharge output at the engine speed. And the storage coefficient is updated based on the comparison result between the derived temporary coefficient and the storage coefficient. Here, the temporary coefficient is derived by dividing the actually measured value of the discharge output by the engine speed.

  For example, the calculation formula that is the threshold value of the legend a in FIG. 7B is corrected by the learning process. The output switching unit 148b specifies a threshold value based on the calculation formula stored in the storage unit 148a and the engine speed. Then, the half discharge state and the full discharge state are switched depending on whether or not the required value of the discharge output is equal to or more than the specified threshold value. If the inclination of the proportional portion of the threshold value and the engine speed is corrected by the learning process so that the legend a changes to the legend b, the region where the semi-discharge state is increased is enlarged, and the fuel consumption can be improved.

  In addition, the measurement of discharge output is less affected by disturbances, and the engine speed profile (history) is highly reproducible when the engine starts (including when the ISS (idle stop system) returns), and when the vehicle is at a roughly constant speed. This is performed during the engine stabilization period in which the engine speed is stable, such as when running.

  FIG. 8 is an explanatory diagram for explaining a learning process when the engine is started. FIG. 8A shows an example of the transition of the engine speed with the passage of time when the engine is started, and FIG. 8B shows an example of the transition of the discharge capacity of the variable capacity oil pump 1 with the passage of time. Indicates.

  As shown in FIG. 8A, the determination information update unit 148c monitors the engine speed until the engine speed starts to increase after the engine starts increasing (determination period). In this determination period, the determination information updating unit 148c sets the required value for the discharge output to a value larger than the required value that is actually derived from the output value of the sensor 150a, as indicated by the alternate long and short dash line in FIG. For example, the upper limit value is set.

  Then, the control device 148 feedback-controls the opening degree of the control valve 136 so that the output value from the line pressure sensor 150b converges to the set required discharge output value in accordance with the output value from the sensor 150a. As a result, as shown in FIG. 8B, the discharge output of the variable displacement oil pump 1 rises to a dischargeable output that can be discharged in a half-discharge state, and then decreases as the engine speed decreases.

  The determination information update unit 148c acquires an actual measurement value of the discharge output when the engine speed reaches a peak (when it reaches a maximum value). At this time, the actual measured value of the discharge output before the engine speed reaches its peak is affected by a response delay. Therefore, the effect of response delay can be avoided by referring to the measured value of the discharge output when the engine speed reaches the peak. Further, after the determination period, the determination information update unit 148c gradually converges the discharge output request value to the actual request value (derived according to the output value of the output sensor 150a).

  FIG. 9 is an explanatory diagram for explaining the learning process during the engine stable period. FIG. 9A shows an example of a transition with time of the engine speed during vehicle travel, and FIG. 9B shows an example of a transition of discharge output of the variable capacity oil pump 1 with time. Indicates.

  As shown in FIG. 9A, the determination information update unit 148c determines whether or not the engine speed is continuously stable for a predetermined time (the engine rotation change amount is within a predetermined range) while the engine is being driven. Keep doing. Here, the engine speed change amount indicates the magnitude of a change in the engine speed, such as the difference between the maximum value and the minimum value of the engine speed in a predetermined measurement unit time.

  When the engine speed is stabilized for a predetermined time, the determination information update unit 148c shifts to a learning period in which a learning process is performed. During the learning period, the determination information update unit 148c sets the required value of the discharge output to a value larger than the required value actually derived from the output value of the sensor 150a, as indicated by a dashed line in FIG. For example, the upper limit value is set. The control device 148 feedback-controls the opening degree of the control valve 136 so that the output value from the line pressure sensor 150b converges to the set required discharge output value according to the output value from the sensor 150a. As a result, the discharge output of the variable displacement oil pump 1 rises to a dischargeable output that can be discharged in a half-discharge state, as shown in FIG. 9B.

  The determination information update unit 148c acquires an actual measurement value of the dischargeable output during the learning period. While the actual measurement value is acquired only for the last sample of the determination period when the engine is started, a plurality of actual measurement values can be acquired in a preset sampling cycle during the learning period.

  When the engine speed becomes unstable (when the change width exceeds a predetermined range) or when a certain time has elapsed, the learning period ends, and the determination information update unit 148c gradually increases the required value of the discharge output. (Stepwise) converge to the actual required value (derived according to the output value of the output sensor 150a).

  In this way, the determination information updating unit 148c derives a temporary coefficient by dividing the actual measured value of the discharge output acquired at the time of starting the engine or during the engine stable period by the engine speed when the actual measured value is measured. Perform learning process. Hereinafter, specific processing will be described in detail with reference to flowcharts.

(Learning process at engine start)
FIG. 10 is a flowchart showing a schematic flow of a learning process when the engine is started. The process shown in FIG. 10 is executed when the engine output is started (when the ISS is restored) and the discharge output request value is less than the threshold value for switching between the half-discharge state and the full-discharge state.

(Startup determination process S200)
The determination information updating unit 148c determines whether or not the engine is being started or the ISS is being returned. As a result, when it is determined that the engine is being started or the ISS is being returned, the process proceeds to the discharge output replacement process S202. If it is determined that the engine is neither starting nor returning to the ISS, the process proceeds to the discharge output request value calculation process S214.

(Discharge output replacement process S202)
The determination information update unit 148c sets the required value of the discharge output to a value larger than the required value actually derived from the output value of the sensor 150a instead of calculating the output value of the sensor 150a.

(Engine speed determination process S204)
The determination information update unit 148c determines whether or not the engine speed is equal to or less than a first predetermined value based on the output value of the sensor 150a. As a result, when the engine speed is equal to or lower than the first predetermined value, the process proceeds to the peak detection determination process S206. If the engine speed is greater than the first predetermined value, the process proceeds to the discharge output request value calculation process S214. If the engine speed is too large, the dischargeable hydraulic pressure of the variable displacement oil pump 1 becomes too large to perform the learning process. Therefore, such a situation is avoided by the engine speed determination process S204.

(Peak detection determination process S206)
Based on the output value of the sensor 150a, the determination information update unit 148c determines whether or not the engine speed has reached a peak (a maximum value). That is, the determination information update unit 148c determines whether or not the engine speed has started decreasing after starting to increase. As a result, if it is determined that the engine speed has reached a peak, the process proceeds to the oil temperature region specifying process S208. If it is determined that the engine speed has not reached its peak, the process returns to the start determination process S200.

(Oil temperature region specifying process S208)
The determination information update unit 148c determines whether the oil temperature of the hydraulic oil belongs to a low temperature region, a normal temperature region, or a high temperature region based on the output value of the sensor 150a. At this time, if the oil temperature of the hydraulic oil is lower than the lower limit value of the low temperature range or higher than the upper limit value of the high temperature range, that is, if it does not fall into any of the low temperature range, the normal temperature range, or the high temperature range, it is excluded It becomes.

(Oil temperature learning target determination process S210)
The determination information update unit 148c determines whether or not the oil temperature of the hydraulic oil is not subject to learning processing. As a result, when it is determined that the oil temperature of the hydraulic oil is not subject to the learning process, the process proceeds to the discharge output request value calculation process S214. As described above, when the oil temperature is extremely low or high, the learning process is not performed, so that it is possible to avoid erroneous learning due to the actually measured value when the behavior of the oil temperature is unstable. When it determines with the oil temperature of hydraulic oil not being the object of a learning process, a process is moved to learning process S212.

(Learning process S212)
The determination information update unit 148c performs a learning process for the threshold value corresponding to the identified oil temperature region. The learning process S212 will be described in detail later.

(Discharge output request value calculation process S214)
The determination information update unit 148c converges the discharge output request value to a value derived from the output value of the sensor 150a.

(Engine stability period learning process)
FIG. 11 is a flowchart showing a schematic flow of the learning process in the engine stable period. The process shown in FIG. 11 is repeatedly executed with a predetermined interval (rest period) when the required value of the discharge output is less than a threshold value for switching between the half-discharge state and the full-discharge state during engine operation.

(Engine speed determination processing S250)
The determination information update unit 148c determines whether the engine speed is equal to or lower than a second predetermined value based on the output value of the sensor 150a. As a result, when the engine speed is equal to or less than the second predetermined value, the process proceeds to the engine rotation change amount determination process S252. If the engine speed is greater than the second predetermined value, the engine speed determination process S250 is repeated. In the engine speed determination process S250, as in the engine speed determination process S204, a situation in which the engine speed is too high and the learning process cannot be performed is avoided.

(Engine rotation change determination processing S252)
Based on the output value of the sensor 150a, the determination information update unit 148c determines whether or not the engine rotation change amount is included in the predetermined range in the immediately preceding measurement unit time. As a result, when the engine rotation change amount is included in the predetermined range, the process proceeds to a predetermined timer count-up process S254. If the engine rotation change amount is not included in the predetermined range, the process proceeds to the engine speed determination process S250.

(Predetermined timer count-up process S254)
The determination information update unit 148c counts up a predetermined timer. Here, the predetermined timer is a counter for measuring the predetermined time shown in FIG. 9, and indicates that the predetermined time has elapsed when the predetermined timer becomes equal to or greater than the timer first threshold value.

(Predetermined timer determination process S256)
The determination information update unit 148c determines whether or not the predetermined timer is equal to or greater than the timer first threshold value. As a result, if it is determined that the predetermined timer is equal to or greater than the timer first threshold, the process proceeds to the discharge output replacement process S258. If it is determined that the predetermined timer is less than the timer first threshold value, the process proceeds to an engine speed determination process S250.

(Discharge output replacement process S258)
Instead of calculating from the output value of the sensor 150a, the determination information updating unit 148c sets the discharge output request value to a value larger than the request value actually derived from the output value of the sensor 150a.

(Learning timer count-up process S260)
The determination information update unit 148c counts up a learning timer. Here, the learning timer is a counter for measuring the learning period shown in FIG. 9, and when the learning timer becomes equal to or greater than the timer second threshold, it indicates that the upper limit time of the learning period has elapsed.

(Learning timer determination processing S262)
The determination information update unit 148c determines whether or not the learning timer is equal to or less than the timer second threshold value. As a result, if it is determined that the learning timer is equal to or less than the second threshold, the process proceeds to the oil temperature region specifying process S264. If it is determined that the learning timer is greater than the second threshold, the process proceeds to timer clear process S268.

(Oil temperature region specifying process S264)
The determination information update unit 148c determines whether the oil temperature of the hydraulic oil belongs to a low temperature region, a normal temperature region, or a high temperature region based on the output value of the sensor 150a. At this time, if the oil temperature of the hydraulic oil is lower than the lower limit value of the low temperature range or higher than the upper limit value of the high temperature range, that is, if it does not fall into any of the low temperature range, the normal temperature range, or the high temperature range, it is excluded It becomes.

(Oil temperature learning target determination process S266)
The determination information update unit 148c determines whether or not the oil temperature of the hydraulic oil is not subject to learning processing. As a result, when it is determined that the oil temperature of the hydraulic oil is not subject to the learning process, the process proceeds to the timer clear process S268. As described above, when the oil temperature is extremely low or high, the learning process is not performed, so that it is possible to avoid erroneous learning due to the actually measured value when the behavior of the oil temperature is unstable. When it determines with the oil temperature of hydraulic oil not being the object of a learning process, a process is moved to learning process S212.

(Learning process S212)
The determination information update unit 148c performs a learning process for the threshold value corresponding to the identified oil temperature region. The learning process S212 will be described in detail later.

(Timer clear processing S268)
The determination information update unit 148c clears (sets to 0) each of the predetermined timer and the learning timer.

(Discharge output request value calculation process S270)
The determination information update unit 148c converges the discharge output request value to a value derived from the output value of the sensor 150a.

(Learning process S212)
FIG. 12 is a flowchart showing a schematic flow of the learning process S212 in the engine starting learning process and the engine stable period learning process. Since the learning process S212 of both the engine start time learning process and the engine stable period learning process are substantially equal, they are shown in the same flowchart.

(Actual value acquisition process S212-2)
The determination information update unit 148c acquires an actual measurement value of the discharge output based on the output value of the line pressure sensor 150b. Further, the determination information update unit 148c also acquires the engine speed when the actual value of the discharge output is measured based on the output value of the sensor 150a.

(Temporary coefficient derivation process S212-4)
The determination information update unit 148c derives a temporary coefficient by dividing the actual value of the discharge output acquired in the actual value acquisition process S212-2 by the engine speed acquired in the actual value acquisition process S212-2.

(Variation error determination processing S212-6)
The determination information update unit 148c determines whether the absolute value of the difference between the storage coefficient of the oil temperature region corresponding to the current oil temperature and the temporary coefficient is larger than the fluctuation error range based on the output of the sensor 150a. To do. The fluctuation error range is a preset value. As a result, when it is determined that the absolute value of the difference between the storage coefficient and the provisional coefficient is larger than the fluctuation error range, the processing is shifted to the storage coefficient comparison process S212-8. If the absolute value of the difference between the storage coefficient and the provisional coefficient is determined to be within the variation error range, the provisional coefficient is not within the variation error range with respect to the storage coefficient, and the storage coefficient is not updated. Then, the learning process S212 is terminated.

(Storage coefficient comparison processing S212-8)
The determination information update unit 148c determines whether or not the storage coefficient is smaller than the temporary coefficient. As a result, when it is determined that the storage coefficient is smaller than the provisional coefficient, the process proceeds to the storage coefficient addition process S212-10. If it is determined that the storage coefficient is greater than or equal to the provisional coefficient, the process proceeds to the storage coefficient subtraction process S212-16.

(Storage coefficient addition processing S212-10)
The determination information update unit 148c updates the storage coefficient to a value obtained by adding a predetermined addition value set in advance to the storage coefficient stored in the storage unit 148a.

(Storage coefficient upper limit determination processing S212-12)
The determination information update unit 148c determines whether or not the storage coefficient updated in the storage coefficient addition process S212-10 is less than a learning upper limit preset for each oil temperature region. As a result, when it is determined that the updated storage coefficient is less than the learning upper limit preset for each oil temperature region in the storage coefficient addition process S212-10, the learning process S212 is terminated. If it is determined that the updated storage coefficient in the storage coefficient addition process S212-10 is greater than or equal to the learning upper limit preset for each oil temperature region, the process proceeds to the storage coefficient limitation process S212-14.

(Storage coefficient limiting process S212-14)
The determination information update unit 148c updates the storage coefficient to a learning upper limit value set in advance for each oil temperature region.

(Storage coefficient subtraction process S212-16)
The determination information update unit 148c updates the storage coefficient to a value obtained by subtracting a predetermined subtraction value set in advance from the storage coefficient stored in the storage unit 148a. Here, the subtraction value is a predetermined value larger than the addition value.

(Storage coefficient lower limit determination processing S212-18)
The determination information update unit 148c determines whether or not the storage coefficient updated in the storage coefficient subtraction process S212-16 is larger than a learning lower limit preset for each oil temperature region. As a result, when it is determined that the updated storage coefficient is larger than the learning lower limit preset for each oil temperature region in the storage coefficient subtraction process S212-16, the learning process S212 is ended. When it is determined in the storage coefficient subtraction process S212-16 that the updated storage coefficient is equal to or less than the learning lower limit preset for each oil temperature region, the process proceeds to the storage coefficient limitation process S212-20.

(Storage coefficient limiting process S212-20)
The determination information update unit 148c updates the storage coefficient to a learning lower limit value set in advance for each oil temperature region.

  As described above, the control device 148 of the variable displacement oil pump 1 updates the determination information based on the engine speed and the actual measured value of the discharge output at the engine speed. Can be achieved.

(Modification)
In the above-described embodiment, a case has been described in which the storage coefficient changes by a preset addition value or subtraction value at the maximum every time the learning process S212 is performed once. In the modification, a case will be described in which the actual value (provisional coefficient) is reflected more quickly on the storage coefficient.

(Learning Process S212 of Modification)
FIG. 13 is a flowchart showing a schematic process flow of the learning process S212 in the modification. In FIG. 13, processes that are substantially the same as the learning process S <b> 212 in the embodiment described above are denoted by the same reference numerals and description thereof is omitted.

(Memory coefficient change amount determination processing S212-50)
The determination information update unit 148c determines whether or not the difference value obtained by subtracting the storage coefficient from the temporary coefficient is less than the learning change amount upper limit. Here, the upper limit of the learning change amount is determined in advance as the upper limit of the change amount of the storage coefficient allowed in the learning process S212. As a result, when it is determined that the difference value obtained by subtracting the storage coefficient from the temporary coefficient is less than the learning change amount upper limit, the processing is shifted to the storage coefficient normal update process S212-52. If it is determined that the difference value obtained by subtracting the storage coefficient from the provisional coefficient is equal to or greater than the learning change amount upper limit, the process proceeds to the storage coefficient upper limit update process S212-54.

(Storage coefficient normal update process S212-52)
The determination information update unit 148c updates the storage coefficient to the temporary coefficient value.

(Storage coefficient upper limit update processing S212-54)
The determination information updating unit 148c updates the storage coefficient to a value obtained by adding the learning change amount upper limit to the storage coefficient.

(Storage coefficient change amount determination processing S212-56)
The determination information update unit 148c determines whether or not the difference value obtained by subtracting the temporary coefficient from the storage coefficient is less than the learning change amount upper limit. As a result, when it is determined that the difference value obtained by subtracting the temporary coefficient from the storage coefficient is less than the learning change amount upper limit, the processing is shifted to the storage coefficient normal update process S212-58. If it is determined that the difference value obtained by subtracting the temporary coefficient from the storage coefficient is equal to or greater than the learning change amount upper limit, the process proceeds to the storage coefficient upper limit update process S212-60.

(Storage coefficient normal update process S212-58)
The determination information update unit 148c updates the storage coefficient to the temporary coefficient value.

(Storage coefficient upper limit update processing S212-60)
The determination information update unit 148c updates the storage coefficient to a value obtained by subtracting the learning change amount upper limit from the storage coefficient.

  Also in the modified example, as in the above-described embodiment, the control device 148 of the variable displacement oil pump 1 can appropriately set the threshold value to improve fuel efficiency. Further, when the storage coefficient is updated, the storage coefficient is overwritten with the temporary coefficient, so that the actually measured value of the discharge output can be quickly reflected on the inclination of the threshold value.

  In the embodiment and the modification described above, the determination information update unit 148c measures the dischargeable output by setting the target value of the discharge output higher than the required value of the discharge output in the semi-discharge state, and the actual measurement value. Explained the case of acquiring. However, the determination information update unit 148c may not set the target value of the discharge output higher than the required value of the discharge output in the half discharge state. However, in the semi-discharge state, by setting the target value of the discharge output higher than the required value of the discharge output, it is possible to actually measure the dischargeable output in the half-discharge state while satisfying the required value of the discharge output. Become.

  In the embodiment and the modification described above, the determination information is a calculation formula including at least a formula for multiplying the engine speed by a predetermined coefficient, and the determination information update unit 148c is stored in the storage unit 148a. The case where the storage coefficient that is the coefficient of the calculation formula is updated has been described. However, the determination information is not limited to the calculation formula and may be a map. In this case, for example, the map is information in which the engine speed is divided into a plurality of rotation speed areas and a threshold value is associated with each rotation speed area. In the learning process, the determination information update unit 148c updates the threshold value associated with the rotation speed region that includes the engine rotation speed when the actual discharge output value is measured, with the actual discharge output value. Then, the output switching unit 148b refers to the updated map, obtains a threshold value associated with the rotation speed region including the engine rotation speed at that time, and requests the discharge output derived from the output of the sensor 150a. It is determined whether the value is greater than or equal to the acquired threshold value.

  Further, the determination information update unit 148c may update the threshold value for each engine speed range stored in the map instead of updating the storage coefficient. However, by using the determination information as a calculation formula and updating the storage coefficient, the amount of data stored in the storage unit 148a can be suppressed, and all threshold values corresponding to a wide range of engine speeds can be corrected by a single learning process. It becomes.

  In the embodiment and the modification described above, the determination information update unit 148c derives a temporary coefficient based on the engine speed and the actual measurement value of the discharge output at the engine speed, and the derived temporary coefficient and the storage coefficient The case where the storage coefficient is updated based on the comparison result has been described. However, the determination information update unit 148c may not derive the temporary coefficient, and may not update the storage coefficient based on the comparison result between the temporary coefficient and the storage coefficient. However, the determination information update unit 148c derives the temporary coefficient, and updates the storage coefficient based on the comparison result between the temporary coefficient and the storage coefficient, thereby appropriately reflecting the measured value of the discharge output in the storage coefficient. Is possible.

  In the embodiment and the modification described above, the determination information update unit 148c has been described with respect to the case where the determination information is updated when the difference between the storage coefficient and the temporary coefficient falls outside the predetermined fluctuation error range. However, the determination information update unit 148c may update the determination information even when the difference between the storage coefficient and the temporary coefficient is included in the variation error range. However, the determination information update unit 148c updates the determination information when the difference between the storage coefficient and the temporary coefficient is outside the predetermined fluctuation error range, thereby updating the storage coefficient due to the measurement error of the dischargeable output and the engine speed. While suppressing erroneous learning, the processing load can be reduced.

  In the above-described modification, the determination information update unit 148c has described the case where the temporary coefficient is stored as the storage coefficient in the storage coefficient normal update process S212-52 when the temporary coefficient is larger than the storage coefficient. In this case, the measured value of the discharge output can be quickly reflected in the storage coefficient.

  In the above-described embodiment, when the provisional coefficient is larger than the storage coefficient, the determination information update unit 148c stores the predetermined addition value in the storage coefficient 148a in the storage coefficient addition process S212-10. The case where the storage coefficient is updated to the value added to is described. In this case, it is possible to suppress the occurrence of erroneous learning due to the influence of the overshoot of the discharge output.

  Further, in the above-described embodiment, when the temporary coefficient is smaller than the storage coefficient, the determination information update unit 148c stores a predetermined subtraction value larger than the addition value in the storage unit 148a in the storage coefficient subtraction process S212-16. The case where the storage coefficient is updated to the value subtracted from the stored storage coefficient has been described. In this case, when the storage coefficient is set larger than the appropriate value, it is possible to suppress the occurrence of a situation where the threshold is set extremely small due to the fluctuation error of the discharge output. In addition, since the subtraction value is set to be larger than the addition value, the actual measurement value can be reflected more quickly than when the storage coefficient is reduced, and switching to the full discharge state is performed. Therefore, it is possible to suppress the occurrence of a situation where the discharge output is insufficient.

  In the above-described modification, the determination information updating unit 148c has described the case where the temporary coefficient is stored as the storage coefficient in the storage coefficient normal update process S212-58 when the temporary coefficient is smaller than the storage coefficient. In this case, the measured value of the discharge output can be quickly reflected in the storage coefficient.

  Further, in the above-described embodiment and the modification, the case where the determination information is set for each of a plurality of preset oil temperature regions (low temperature region, normal temperature region, high temperature region) has been described. It is not necessary to set for each oil temperature region. For example, the determination information may be set regardless of the oil temperature, and a correction coefficient set according to the oil temperature may be incorporated in the determination information. In particular, the determination information may be corrected by incorporating a correction coefficient into the determination information of the oil temperature region that has been subjected to the learning process only for the determination information of the oil temperature region that has not been subjected to the learning process for a certain period. . However, the determination information can be maintained at a more appropriate value by setting the determination information for each of a plurality of oil temperature regions.

  In the embodiment and the modification described above, the case where three oil temperature regions are provided has been described. However, one or two oil temperature regions may be provided, or four or more oil temperature regions may be provided.

  In the above-described embodiment, when the temporary coefficient is larger than the storage coefficient, the storage coefficient is updated to a value obtained by adding a predetermined addition value to the storage coefficient stored in the storage unit 148a, and the temporary coefficient is stored. The case where the storage coefficient is updated to a value obtained by subtracting a predetermined subtraction value larger than the addition value from the storage coefficient stored in the storage unit 148a when it is smaller than the coefficient has been described. However, when the temporary coefficient is smaller than the storage coefficient, the temporary coefficient may be stored as the storage coefficient as in the above-described modification. In this case, since the correction for increasing the memory coefficient is gradually reflected, it is possible to suppress the occurrence of mislearning due to the influence of the overshoot of the discharge output, and it is quicker to reduce the memory coefficient than to increase it. In addition, since the discharge output can be reflected in the threshold value, it is possible to further improve the stability.

  The preferred embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the above-described embodiments, and various modifications within the scope described in the claims. Needless to say, the modified examples also belong to the technical scope of the present invention.

  The present invention can be used mainly for a control device of a variable displacement oil pump mounted on a vehicle.

1 Variable displacement oil pump 10a Housing side first discharge port (discharge port)
10b Cover side first discharge port (discharge port)
11a Housing side second discharge port (discharge port)
11b Cover side second discharge port (discharge port)
148 Control device 148a Storage unit 148b Output switching unit 148c Determination information update unit

Claims (10)

There are two discharge ports, one half of the two discharge ports discharges the hydraulic oil at a higher pressure than the other, the two discharge ports discharge the hydraulic oil from both the half discharge states, Is a variable displacement oil pump control device capable of switching all discharge states with a large dischargeable output corresponding to the engine speed,
A storage unit storing determination information for specifying a threshold value for switching between the half-discharge state and the full-discharge state according to the engine speed;
A determination information updating unit that updates the determination information stored in the storage unit based on an engine speed and an actual measurement value of a discharge output at the engine speed;
The threshold value is specified based on the determination information stored in the storage unit and the engine speed, and the half-discharge is determined based on whether or not a required discharge output value is equal to or more than the specified threshold value. An output switching unit that switches between a state and the total discharge state;
A control apparatus for a variable displacement oil pump, comprising:   The determination information update unit measures the dischargeable output and obtains the actual measurement value by setting a target value of the discharge output higher than a required value of the discharge output in the half discharge state. The control device for a variable displacement oil pump according to claim 1. The determination information is a calculation formula including at least an equation for multiplying the engine speed by a predetermined coefficient, and the determination information update unit includes a storage coefficient that is the coefficient of the calculation formula stored in the storage unit. The control apparatus for a variable displacement oil pump according to claim 1 or 2, wherein the control apparatus is updated.   The determination information update unit derives a temporary coefficient based on the engine speed and an actual measurement value of the discharge output at the engine speed, and based on a comparison result between the calculated temporary coefficient and the storage coefficient, 4. The control apparatus for a variable displacement oil pump according to claim 3, wherein the storage coefficient is updated.   The variable displacement oil pump according to claim 4, wherein the determination information updating unit updates the storage coefficient when a difference between the storage coefficient and the provisional coefficient is outside a predetermined fluctuation error range. Control device.   6. The control apparatus for a variable displacement oil pump according to claim 4, wherein the determination information update unit stores the temporary coefficient as the storage coefficient when the temporary coefficient is larger than the storage coefficient.   When the provisional coefficient is larger than the storage coefficient, the determination information update unit updates the storage coefficient stored in the storage unit to a value obtained by adding a predetermined addition value to the storage coefficient. The control device for a variable displacement oil pump according to claim 4 or 5.   When the provisional coefficient is smaller than the storage coefficient, the determination information update unit updates a predetermined subtraction value larger than the addition value to a value subtracted from the storage coefficient stored in the storage unit. The control device for a variable displacement oil pump according to claim 7.   The variable capacity oil according to any one of claims 4 to 7, wherein the determination information update unit stores the temporary coefficient as the storage coefficient when the temporary coefficient is smaller than the storage coefficient. Pump control device.   The control device for a variable displacement oil pump according to any one of claims 1 to 9, wherein the determination information is set for each of a plurality of preset oil temperature regions.

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