JP2018091198A - Oil supply device of on-vehicle engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an oil supply device of an on-vehicle engine, which can make it hard to give a crew member the discomfort which is caused by the change of a pulsation sound based on the pulsation of the discharge pressure of said oil, when the discharge pressure of oil in an oil pump is changed.SOLUTION: A discharge pressure control part 303 of an oil supply device 210 changes the discharge pressure of oil at a lower change speed that when the discharge pressure of the oil is changed under the situation, in which the discharge pressure sensor value detected by a discharge pressure sensor 311 is less than a threshold value, when the discharge pressure of the oil in the oil pump 10 is changed.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an oil supply device for an in-vehicle engine including an oil pump capable of changing oil discharge pressure.

  Patent Document 1 describes an example of an engine oil supply system including a variable displacement oil pump. The engine is provided with a plurality of devices that require oil supply. Examples of such a device include a hydraulically driven valve timing adjusting device and an oil jet for cooling the piston. In such an oil supply system including a plurality of devices, the required hydraulic pressure in each device is derived individually, and the highest required hydraulic pressure among the required hydraulic pressures is set as the target discharge pressure of the oil pump. The oil discharge pressure in the oil pump is controlled.

JP 2014-159757 A

  Incidentally, in an oil pump as described in Patent Document 1, the oil discharge pressure pulsates. Then, as the discharge pressure is higher, the pulsation sound, which is a sound generated due to the pulsation of the discharge pressure, is larger, so that the pulsation sound may be transmitted to the vehicle occupant. When the target discharge pressure is reduced under a situation where the pulsation noise is large, the pulsation sound is reduced due to a decrease in the oil discharge pressure. At this time, if the pulsation sound suddenly decreases, the pulsation sound heard by the vehicle occupant may not be heard suddenly, and the vehicle occupant may feel uncomfortable.

  An object of the present invention is to provide an in-vehicle engine oil supply apparatus that can make it difficult for a vehicle occupant to feel uncomfortable due to a change in pulsation sound when changing the oil discharge pressure in an oil pump. .

  An on-vehicle engine oil supply device for solving the above problems includes an oil pump capable of changing an oil discharge pressure, a sensor for detecting an oil pressure discharged from the oil pump, and an oil discharge pressure in the oil pump. A discharge pressure control unit for controlling. In this oil supply apparatus, the discharge pressure control unit is configured to change the discharge pressure sensor when the oil discharge pressure in the oil pump is changed under a situation where the discharge pressure sensor value, which is the oil pressure detected by the sensor, is equal to or greater than a threshold value. In a situation where the value is less than the threshold value, the discharge pressure is changed at a lower change speed than when the oil discharge pressure in the oil pump is changed.

  The higher the oil discharge pressure in the oil pump, the greater the pulsation of the discharge pressure, and the greater the pulsation sound that is the sound resulting from the pulsation of the discharge pressure. Therefore, when the oil discharge pressure is greater than or equal to the threshold value, the pulsation sound is more easily transmitted to the vehicle occupant than when the oil discharge pressure is less than the threshold value.

  Therefore, in the above configuration, when the discharge pressure sensor value is equal to or greater than the threshold value, the oil discharge pressure in the oil pump is changed at a lower change speed than when the discharge pressure sensor value is less than the threshold value. For this reason, when the discharge pressure is decreased under a situation where the discharge pressure sensor value is equal to or greater than the threshold value, the discharge pressure is gradually decreased as compared with the case where the discharge pressure sensor value is less than the threshold value, and thus the pulsation sound is rapidly reduced. It is suppressed. That is, it is difficult for an event that the pulsation sound heard by the vehicle occupant suddenly disappears. Therefore, when the oil discharge pressure is decreased, it is possible to make it difficult for the vehicle occupant to feel uncomfortable due to the change in the pulsating sound.

  When the discharge pressure sensor value is less than the threshold value, the pulsation sound is smaller than when the discharge pressure sensor value is greater than or equal to the threshold value, so that the occupant of the vehicle is less likely to hear the pulsation sound. Therefore, when changing the oil discharge pressure in the oil pump within a range where the discharge pressure sensor value is less than the threshold value, the discharge pressure should be changed at a higher change rate than when the discharge pressure sensor value is equal to or greater than the threshold value. The oil discharge pressure will be controlled. Therefore, it is possible to suppress an increase in deviation between the target discharge pressure for the oil pump and the discharge pressure sensor value when the oil discharge pressure is changed.

  Further, the discharge pressure may be increased to shift from a state where the discharge pressure sensor value is less than the threshold value to a state where the discharge pressure sensor value is equal to or greater than the threshold value. In this case, when the discharge pressure sensor value reaches the threshold value, the pulsation sound becomes louder than when the discharge pressure sensor value is less than the threshold value, and the pulsation sound is easily heard by the vehicle occupant. In the above configuration, when the discharge pressure sensor value is equal to or greater than the threshold value, the oil discharge pressure increases more slowly than when the discharge pressure sensor value is less than the threshold value. As a result, the pulsation sound that can be heard by the vehicle occupant gradually increases. In other words, it is difficult for an event in which a loud pulsating sound is suddenly heard by a vehicle occupant. Therefore, even when the oil discharge pressure is increased, it is possible to make it difficult for the vehicle occupant to feel uncomfortable due to the change in the pulsating sound.

In the oil supply device for the on-vehicle engine, the oil pump changes the oil discharge pressure by changing the indicated current value for the electric actuator.
Therefore, for example, the discharge pressure control unit uses the target discharge pressure and the discharge pressure sensor value for the oil pump when changing the oil discharge pressure in the oil pump under a situation where the discharge pressure sensor value is less than the threshold value. The discharge pressure may be changed by inputting the command current value derived by the feedback control to the actuator. On the other hand, the discharge pressure control unit, when changing the oil discharge pressure in the oil pump under the situation where the discharge pressure sensor value is equal to or greater than the threshold value, indicates an instruction derived by feedback control using the target discharge pressure and the discharge pressure sensor value. Performs a speed reduction process that changes the command current value derived by feedback control so that the discharge pressure changes at a lower change speed than the discharge pressure change speed when the current value is input to the actuator. The command current value derived by the above may be input to the actuator. Thus, when the discharge pressure sensor value is equal to or greater than the threshold value, the oil discharge pressure can be changed at a lower change speed than when the discharge sensor value is less than the threshold value by performing the speed reduction process.

  By the way, when the oil discharge pressure in the oil pump is gradually changed, the difference between the target discharge pressure for the oil pump and the discharge pressure sensor value tends to increase. Therefore, when the duration of the state in which the command current value derived by the speed reduction process is input to the actuator reaches a specified time, the discharge pressure control unit has a higher change speed than before the said continuous time reaches the specified time. It is preferable to change the discharge pressure. According to this configuration, after the continuation time reaches the specified time, even if the discharge pressure sensor value is equal to or greater than the threshold value, the oil discharge pressure is changed at a higher change rate than before the continuation time reaches the specified time. Can be changed. Therefore, the state in which the command current value derived by the speed reduction process is input to the actuator is continued for a long time, and an increase in the difference between the discharge pressure sensor value and the target discharge pressure can be suppressed.

  In the engine, noise is also generated from other than the oil pump. Such a sound tends to increase as the engine rotation speed, which is the rotation speed of the engine crankshaft, increases. That is, when the engine speed is high, the pulsation sound of the oil pump is easily masked by other sounds. Therefore, it is preferable that the engine oil supply device includes a threshold setting unit that increases the threshold as the engine speed increases. According to this configuration, when the engine rotation speed is high and other sounds generated by the engine are loud, the threshold value is set to a large value, so that the change speed of the oil discharge pressure in the oil pump is not easily lowered. As a result, it is possible to suppress an increase in the difference between the discharge pressure sensor value and the target discharge pressure while making it difficult for the vehicle occupant to feel uncomfortable due to the change in the pulsating sound.

The schematic diagram which shows the outline of the oil circulation path | route in an engine provided with the oil supply apparatus of embodiment. It is sectional drawing which shows the oil pump in the oil supply apparatus, Comprising: The figure which shows the state in which the discharge pressure of oil is the maximum. It is sectional drawing which shows the oil pump, Comprising: The figure which shows the state in which the discharge pressure of oil is the minimum. The flowchart explaining the process routine which the discharge pressure control part of the oil supply apparatus performs. A graph for explaining a method of determining the length of the specified time. (A) is a timing chart which shows transition of the discharge pressure of the oil in an oil pump, (b) is a timing chart which shows transition of the command electric current value with respect to an oil control valve.

Hereinafter, an embodiment embodying an oil supply device for an in-vehicle engine will be described with reference to FIGS.
FIG. 1 illustrates an oil circulation path in an in-vehicle engine (hereinafter simply referred to as “engine 200”) including the oil supply apparatus 210 of the present embodiment. As shown in FIG. 1, the engine 200 includes an oil pan 201 that stores oil, and a main oil gallery 202 to which oil in the oil pan 201 is supplied via an oil supply device 210. The engine 200 is provided with a plurality of devices 203 that require oil supply. Then, the oil discharged from the device 203 returns to the oil pan 201.

  The oil supply apparatus 210 of the present embodiment includes an oil pump 10 that can change the discharge pressure, an oil control valve 100 that operates the oil pump 10, and an oil discharge pressure in the oil pump 10 through control of the oil control valve 100. And a control device 300 for controlling.

Next, the oil pump 10 will be described with reference to FIGS. 1, 2, and 3.
The oil pump 10 is a variable displacement pump that operates based on rotation of the crankshaft of the engine 200. As shown in FIGS. 2 and 3, the oil pump 10 includes an input shaft 11 that rotates in synchronization with the crankshaft, and a casing member CS in which a housing space 40 is partitioned. The housing space 40 is provided with an inner rotor 50 that rotates integrally with the input shaft 11, an outer rotor 60 that is disposed on the outer peripheral side of the inner rotor 50, and a ring-shaped adjustment ring 70 that surrounds the outer rotor 60.

  The casing member CS is provided with a suction port 12 for sucking oil therein and a discharge port 13 for discharging the oil inside the casing member CS. As shown in FIG. 1, the suction port 12 communicates with a suction oil passage 114 that communicates with the oil pan 201, and the discharge port 13 communicates with a main oil gallery 202 as shown in FIGS. Communicating with

  As shown in FIGS. 2 and 3, a plurality of external teeth 51 are provided on the outer periphery of the inner rotor 50, and a plurality of internal teeth 61 that mesh with the outer teeth 51 of the inner rotor 50 are provided on the inner periphery of the outer rotor 60. It has been. The number of inner teeth 61 is one more than the number of outer teeth 51. The outer rotor 60 is rotatably held by the adjustment ring 70.

  The rotation center of the outer rotor 60 is eccentric with respect to the rotation center of the inner rotor 50. The outer teeth 51 of the inner rotor 50 and the inner teeth 61 of the outer rotor 60 are in a state in which a part thereof (the right side portion in FIG. 2) is engaged with each other. A working chamber 41 filled with oil is formed between the outer periphery of the inner rotor 50 and the inner periphery of the outer rotor 60.

  In the working chamber 41, in a portion from a position where the outer teeth 51 of the inner rotor 50 and the inner teeth 61 of the outer rotor 60 are engaged with each other to a predetermined position in the rotation direction of the input shaft 11 indicated by an arrow in FIG. The clearance between the outer teeth 51 of the inner rotor 50 and the inner teeth 61 of the outer rotor 60 gradually increases with the rotation. The portion where the gap between the outer teeth 51 of the inner rotor 50 and the inner teeth 61 of the outer rotor 60 gradually increases in this way communicates with the suction port 12. On the other hand, in the working chamber 41, a portion where the gap between the outer teeth 51 of the inner rotor 50 and the inner teeth 61 of the outer rotor 60 gradually decreases as the rotors 50 and 60 rotate is in communication with the discharge port 13.

  When the oil pump 10 operates, the input shaft 11 rotates, so that the rotors 50 and 60 rotate while meshing with each other. Then, the oil stored in the oil pan 201 is sucked into the working chamber 41 from the suction port 12 through the suction oil passage 114 and discharged from the discharge port 13 to the discharge oil passage 13a.

  The adjustment ring 70 includes a ring-shaped main body 71 that holds the outer rotor 60, and a protrusion 72 that protrudes from the outer periphery of the main body 71 in the radial direction of the rotors 50 and 60. The main body 71 of the adjustment ring 70 is provided with elongated holes 711 and 712 extending in the specified direction. Guide pins 81 and 82 fixed to the casing member CS are inserted through the long holes 711 and 712. Thereby, the adjustment ring 70 can be displaced in the extending direction of the long holes 711 and 712.

  A first seal member 83 is provided at the tip of the protrusion 72 of the adjustment ring 70, and a second seal member 84 is provided in the main body 71. The seal members 83 and 84 abut against the side wall of the casing member CS, and the space between the side wall and the outer periphery of the adjustment ring 70 is sealed, whereby the adjustment ring 70 and the seal members 83, A control oil chamber 42 is defined by 84.

  The control oil chamber 42 is provided with an opening 14 communicating with the control oil passage 111, and oil can be supplied from the oil control valve 100 to the control oil chamber 42 through the control oil passage 111 and the opening 14. Yes. In addition, the accommodation space 40 is provided with a spring 15 that applies an urging force to the projecting portion 72 in a direction to reduce the volume of the control oil chamber 42. The spring 15 is disposed on the opposite side of the control oil chamber 42 with the protrusion 72 interposed therebetween. FIG. 2 shows a state where the adjustment ring 70 is held at a position where the volume of the control oil chamber 42 is minimized by the biasing force from the spring 15 because the internal pressure of the control oil chamber 42 is low. In the present embodiment, the position of the adjustment ring 70 when the volume of the control oil chamber 42 is minimized, that is, the position of the adjustment ring 70 in FIG. 2 is referred to as an “initial position”.

  When the adjustment ring 70 is disposed at the initial position, when oil is supplied to the control oil chamber 42 and the internal pressure of the control oil chamber 42 increases, the control oil chamber resists the urging force from the spring 15. The adjustment ring 70 is displaced from the initial position in the direction of increasing the volume of 42. That is, the adjustment ring 70 is displaced while rotating in the direction from the state shown in FIG. 2 toward the state shown in FIG. 3 (counterclockwise direction in FIG. 2). On the other hand, when the oil is discharged from the control oil chamber 42 by the operation of the oil control valve 100, the internal pressure of the control oil chamber 42 is reduced, and the volume of the control oil chamber 42 is reduced by the urging force from the spring 15. The adjustment ring 70 is displaced in the direction. That is, the adjustment ring 70 is displaced while rotating in the direction (clockwise direction in FIG. 3) from the state shown in FIG. 3 toward the state shown in FIG. That is, the position of the adjustment ring 70 is determined by the internal pressure of the control oil chamber 42 and the urging force from the spring 15. As the position of the adjustment ring 70 changes, the relative positions of the meshed portions of the teeth 51 and 61 of the inner rotor 50 and the outer rotor 60 with respect to the openings of the suction port 12 and the discharge port 13 change. For this reason, the discharge pressure which is the pressure of the oil discharged from the discharge port 13 is changed through the change of the position of the adjustment ring 70 by adjusting the internal pressure of the control oil chamber 42.

  Specifically, in the oil pump 10, when the position of the adjustment ring 70 is in the “initial position” as shown in FIG. 2, the oil discharge pressure becomes maximum. As shown in FIG. 2, when the internal pressure of the control oil chamber 42 increases from a state where the oil discharge pressure is at the maximum, the adjustment ring 70 resists the urging force from the spring 15 as the internal pressure increases. It is displaced while rotating counterclockwise in FIG. As a result, in the portion where the gap between the external teeth 51 and the internal teeth 61 gradually increases with the rotation of the rotors 50 and 60, the range overlapping the suction port 12 becomes small, and the external teeth 51 and the internal teeth A part of the portion where the gap with 61 gradually decreases overlaps with the suction port 12. As a result, the oil discharge pressure is lowered. On the contrary, when the internal pressure of the control oil chamber 42 becomes low, the adjustment ring 70 is displaced while being rotated in the clockwise direction in FIG. Get higher.

Next, the oil control valve 100 will be described with reference to FIGS. 1, 2, and 3.
As shown in FIGS. 1 and 2, the oil control valve 100 can switch the communication state of a plurality of oil paths by switching the position of the spool by driving an electromagnetically driven actuator 100A. That is, the oil control valve 100 discharges oil from the control port 101 to which the control oil passage 111 is connected, the supply port 102 to which the supply oil passage 112 branched from the discharge oil passage 13a of the oil pump 10 is connected, and oil. And a discharge port 103 to which the discharge oil passage 113 is connected. Then, by changing the position of the spool by adjusting the instruction current value Iocv for the actuator 100A, the position of the spool discharges the oil returned to the control port 101 from the discharge port 103 (FIG. 2), The oil is supplied to the supply port 102 and switched to a supply position (FIG. 3) for sending the oil from the control port 101 to the control oil passage 111.

Next, the control device 300 will be described with reference to FIG.
As shown in FIG. 1, a discharge pressure sensor 311, a temperature sensor 312, and a crank angle sensor 313 are electrically connected to the control device 300. The discharge pressure sensor 311 detects a discharge pressure sensor value PS that is the pressure of oil discharged from the oil pump 10, and the temperature sensor 312 detects an oil temperature TMP that is the temperature of oil supplied to the oil pump 10. The crank angle sensor 313 detects an engine rotation speed NE that is the rotation speed of the crankshaft. The control device 300 controls the discharge current of oil in the oil pump 10 by controlling the command current value Iocv for the actuator 100A of the oil control valve 100 based on the information detected by these sensors 311 to 313. It is supposed to be.

  Further, the control device 300 includes a target setting unit 301, a threshold setting unit 302, and a discharge pressure control unit 303 as functional units for controlling the oil discharge pressure in the oil pump 10.

  The target setting unit 301 sets a target discharge pressure PTr for the oil pump 10. Specifically, the target setting unit 301 individually derives the required hydraulic pressure in each of the devices 203, and among the required hydraulic pressures, the target hydraulic pressure corresponding to the highest required hydraulic pressure or the highest required hydraulic pressure is set as the target discharge pressure PTr. To do. Then, the target setting unit 301 outputs the set target discharge pressure PTr to the discharge pressure control unit 303.

  The threshold value setting unit 302 sets a threshold value PSTh for determining the change timing of the change rate of the oil discharge pressure in the oil pump 10 based on the discharge pressure sensor value PS. For example, the threshold setting unit 302 changes the threshold PSTh according to the engine speed NE. That is, the threshold value setting unit 302 sets the threshold value PSTh to a larger value as the engine speed NE is higher. Then, the threshold value setting unit 302 outputs the set threshold value PSTh to the discharge pressure control unit 303.

  The discharge pressure control unit 303 controls the command current value Iocv for the actuator 100A based on the input target discharge pressure PTr, the discharge pressure sensor value PS, the threshold value PSTh, and the like, thereby controlling the oil discharge pressure in the oil pump 10. Control. Specifically, the discharge pressure control unit 303 changes the oil discharge pressure by inputting the command current value Iocv derived by feedback control using the target discharge pressure PTr and the discharge pressure sensor value PS to the actuator 100A. To do. As will be described in detail later, when changing the command current value Iocv, the discharge pressure control unit 303 sets the command current value Iocv derived by feedback control to the actuator 100A when the discharge pressure sensor value PS is greater than or equal to the threshold value PSTh. In order to change the discharge pressure at a lower change speed than the change speed of the discharge pressure when inputting, the instruction current value derived by the feedback control is changed to reduce the instruction current value Iocv, and the instruction current derived by this speed reduction process. The discharge pressure is changed by inputting the value Iocv to the actuator 100A.

  When the discharge pressure control unit 303 increases the command current value Iocv, the oil supply pressure from the oil control valve 100 to the control oil chamber 42 of the oil pump 10 increases, and the internal pressure of the control oil chamber 42 increases. As a result, the adjustment ring 70 is displaced in the direction of increasing the volume of the control oil chamber 42, so that the oil discharge pressure is reduced. On the other hand, when the discharge pressure control unit 303 decreases the command current value Iocv, the oil supply pressure from the oil control valve 100 to the control oil chamber 42 of the oil pump 10 decreases, and the internal pressure of the control oil chamber 42 decreases. As a result, the adjustment ring 70 is displaced in the direction of reducing the volume of the control oil chamber 42, so that the oil discharge pressure increases.

  Next, a processing routine executed by the discharge pressure control unit 303 when the target discharge pressure PTr for the oil pump 10 is changed will be described with reference to FIG. This processing routine is executed for each preset control cycle until it can be determined that the target discharge pressure PTr and the discharge pressure sensor value PS are equal.

  As shown in FIG. 4, in the present processing routine, the discharge pressure control unit 303 derives the command current value Iocv by feedback control using the target discharge pressure PTr and the discharge pressure sensor value PS (step S11). Subsequently, the discharge pressure control unit 303 determines whether or not the discharge pressure sensor value PS detected by the discharge pressure sensor 311 is greater than or equal to the threshold value PSTh set by the threshold value setting unit 302 (step S12).

  Here, in the oil pump 10, the oil discharge pressure pulsates. As the discharge pressure increases, that is, as the discharge pressure sensor value PS increases, the pulsation sound that is a sound caused by the pulsation of the discharge pressure increases. And when a pulsation sound is small, a pulsation sound is hard to hear to the passenger | crew of a vehicle. However, if the pulsating sound is large to some extent, the pulsating sound is heard by the vehicle occupant. Therefore, in this embodiment, the threshold value PSTh is set by the threshold value setting unit 302 so that it can be determined using the discharge pressure sensor value PS whether or not the pulsation sound is heard by the occupant. Therefore, when the discharge pressure sensor value PS is equal to or greater than the threshold value PSTh, it can be determined that there is a possibility that the occupant can hear the pulsating sound because the pulsating sound is large. On the other hand, when the discharge pressure sensor value PS is less than the threshold value PSTh, since the pulsation sound is small, it is not determined that the occupant may hear the pulsation sound.

  In step S12, when the discharge pressure sensor value PS is less than the threshold value PSTh (NO), the discharge pressure control unit 303 proceeds to step S15 described later. On the other hand, when the discharge pressure sensor value PS is greater than or equal to the threshold value PSTh (step S12: YES), the discharge pressure control unit 303 proceeds to the next step S13.

  In step S13, the discharge pressure control unit 303 obtains the duration Tm in which the command current value Iocv derived by the speed reduction process described later is being input to the actuator 100A. And the discharge pressure control part 303 determines whether the acquired continuation time Tm is less than the preset regulation time TmTh. A method for setting the specified time TmTh will be described later.

  In step S13, when the continuation time Tm is equal to or longer than the specified time TmTh (NO), the discharge pressure control unit 303 moves the process to step S15 described later. On the other hand, when the duration Tm is less than the specified time TmTh (step S13: YES), the discharge pressure control unit 303 derives the command current value Iocv by performing the speed reduction process (step S14). In this speed reduction process, first, a difference ΔIocv between the previous value of the command current value Iocv and the current value of the command current value Iocv derived by the feedback control is calculated. The “previous value of the command current value Iocv” here is the command current value Iocv input to the actuator 100A when this processing routine was executed last time, and the “current value of the command current value Iocv” is The latest value of the command current value Iocv derived by feedback control. Subsequently, the difference ΔIocv is divided by an integer “N (eg, 3)” equal to or greater than “2”, and the sum of the calculation result (= ΔIocv / N) and the previous value of the command current value Iocv is the command current value Iocv. As derived. In the present embodiment, the difference ΔIocv, that is, the amount of change per unit time of the command current value Iocv derived by feedback control is referred to as “first change speed VI1”. The change amount per unit time of the command current value Iocv derived by the speed reduction processing, that is, the value obtained by dividing the difference ΔIocv by “N” is referred to as “second change speed VI2.” The second change speed VI2 is lower than the first change speed VI1. And the discharge pressure control part 303 transfers the process to the following step S15.

  In step S15, the discharge pressure control unit 303 controls the drive of the oil control valve 100 by inputting the command current value Iocv derived in step S11 or step S14 to the actuator 100A of the oil control valve 100. When the oil control valve 100 is driven with the command current value Iocv derived at step S14, the oil discharge pressure of the oil pump 10 is higher than when the oil control valve 100 is driven with the command current value Iocv derived at step S11. The change speed is reduced. Thereafter, the discharge pressure control unit 303 once ends this processing routine.

  If it can be determined that the target discharge pressure PTr and the discharge pressure sensor value PS are equal, that is, if it can be determined that the discharge pressure sensor value PS has converged to the target discharge pressure PTr, the duration Tm is set to “0”. Reset.

  Next, a method for setting the specified time TmTh will be described with reference to FIG. In FIG. 5, for convenience of explanation, it is assumed that the engine speed NE is constant and the threshold value PSTh is not changed.

The two-dot chain line in FIG. 5 is the prescribed discharge pressure PSA, and the threshold value PSTh shown by the one-dot chain line is set to a value smaller than the prescribed discharge pressure PSA. The specified discharge pressure PSA is a discharge pressure having the following characteristics.
-When the oil discharge pressure in the oil pump 10 shifts from a state where the discharge pressure is less than the specified discharge pressure PSA to a state where the discharge pressure is equal to or higher than the specified discharge pressure PSA, if the increase rate of the discharge pressure is large, There is a risk that the vehicle occupant may feel uncomfortable.
-When the discharge pressure of the oil changes from a state where the discharge pressure is equal to or higher than the specified discharge pressure PSA to a state where the discharge pressure is less than the specified discharge pressure PSA, if the discharge pressure decreases at a large rate, the pulsation noise will suddenly decrease. There is a risk of feeling uncomfortable.

  That is, when the discharge pressure of the oil is less than the specified discharge pressure PSA, the discharge pressure is changed from the state where the discharge pressure is higher than the specified discharge pressure PSA, and when the oil discharge pressure is higher than the specified discharge pressure PSA, When shifting to a state below the pressure PSA, it can be said that by making the change rate of the discharge pressure low, it is difficult to give the vehicle occupant an uncomfortable feeling due to the change in the pulsating sound. In order to realize this, when the discharge pressure reaches the specified discharge pressure PSA when the discharge pressure of the oil shifts from the state less than the specified discharge pressure PSA to the state where the discharge pressure exceeds the specified discharge pressure PSA, It is necessary to set the length of the specified time TmTh so that the duration time Tm of the specified time does not exceed the specified time TmTh. Further, when the discharge pressure of the oil reaches the specified discharge pressure PSA when the discharge pressure of the oil shifts from the state where the discharge pressure is equal to or higher than the specified discharge pressure PSA to the state where the discharge pressure is lower than the specified discharge pressure PSA, the above-described duration Tm is specified. It is necessary to set the length of the specified time TmTh so that it is not longer than the time TmTh.

Therefore, the lower limit value of the increase speed of the target discharge pressure PTr assumed in the design of the oil supply apparatus 210 is set as the target increase speed lower limit value, and the target discharge pressure PTr assumed in the design of the oil supply apparatus 210 is set. In this embodiment, the specified time TmTh is set so as to satisfy the following two conditions.
When increasing the oil discharge pressure, when the increase speed of the target discharge pressure PTr is equal to the target increase speed lower limit, that is, when the discharge pressure is increased most slowly, the discharge pressure sensor value PS is greater than the specified discharge pressure PSA. Even if the value becomes larger, the state where the command current value Iocv derived by the speed reduction process is input to the actuator 100A is continued.
When reducing the discharge pressure from the maximum value of the oil discharge pressure, if the decrease rate of the target discharge pressure PTr is equal to the target decrease rate lower limit value, that is, if the discharge pressure is decreased most slowly, the discharge pressure sensor value PS Even if becomes smaller than the specified discharge pressure PSA, the state where the command current value Iocv derived by the speed reduction process is input to the actuator 100A is continued.

  Next, with reference to FIG. 6, an operation of changing the oil discharge pressure in the oil pump 10 will be described together with effects. Here, for convenience of explanation, it is assumed that the engine rotation speed NE after completion of the start of the engine 200 is constant and the threshold value PSTh has not changed.

  As shown in FIGS. 6A and 6B, the engine 200 is started at the first timing t11. Then, the target discharge pressure PSTr is set as shown by the solid line in FIG. 6A, and the oil control is performed so that the discharge pressure sensor value PS becomes equal to the target discharge pressure PTr as shown by the broken line in FIG. The command current value Iocv for the actuator 100A of the valve 100 is controlled. In the example shown in FIG. 6, the target discharge pressure PTr increases from the first timing t11. In this case, since the discharge pressure sensor value PS is less than the threshold value PSTh, the command current value Iocv derived by feedback control using the target discharge pressure PTr and the discharge pressure sensor value PS is input to the actuator 100A of the oil control valve 100. Is done. Therefore, the command current value Iocv input to the actuator 100A decreases at the first change speed VI1. As a result, the discharge pressure sensor value PS increases in such a manner that there is not much difference between the discharge pressure sensor value PS and the target discharge pressure PTr.

  When the discharge pressure sensor value PS reaches the threshold value PSTh at the second timing t12, the command current value Iocv derived by the speed reduction processing is input to the actuator 100A from the second timing t12. Become. Therefore, the command current value Iocv input to the actuator 100A decreases at the second change speed VI2 that is smaller than the first change speed VI1. As a result, the discharge pressure sensor value PS gradually increases as compared to the case where the command current value Iocv decreases at the first change speed VI1 before the second timing t12. Thereafter, when the discharge pressure sensor value PS converges to the target discharge pressure PTr at the third timing t13, the command current value Iocv is held. As a result, the oil discharge pressure in the oil pump 10 is also maintained. Note that the duration Tm is held at “0” while the discharge pressure sensor value PS converges to the target discharge pressure PTr as in the period from the third timing t13 to the fourth timing t14.

  As described above, when the discharge pressure sensor value PS increases and the discharge pressure sensor value PS becomes equal to or greater than the threshold value PSTh, the pulsation sound generated by the oil pump 10 can be heard by the vehicle occupant. Therefore, in the present embodiment, when the oil discharge pressure in the oil pump 10 is increased and the discharge pressure sensor value PS shifts from a state where the discharge pressure sensor value PS is less than the threshold value PSTh to a state where the discharge pressure sensor value PS is equal to or greater than the threshold value PSTh, the discharge pressure After the sensor value PS reaches the threshold value PSTh, the discharge pressure sensor value PS is gradually increased. As a result, since the pulsation sound generated by the oil pump 10 gradually increases, it is difficult to generate an event in which the pulsation sound that has not been heard by the vehicle occupant until now is suddenly heard. Therefore, when increasing the oil discharge pressure, it is possible to make it difficult for the vehicle occupant to feel uncomfortable due to the change in the pulsating sound.

  Then, the target discharge pressure PTr decreases from the fourth timing t14. At the fourth timing t14, the discharge pressure sensor value PS is greater than or equal to the threshold value PSTh, and at this time, the command current value Iocv increases at the second change speed VI2. That is, the measurement of the duration Tm is started from the fourth timing t14. By increasing the command current value Iocv at the second change speed VI2 in this way, the discharge pressure sensor value PS gradually decreases as compared to the case where the command current value Iocv increases at the first change speed VI1. In a state where the discharge pressure sensor value PS is equal to or greater than the threshold value PSTh, there is a possibility that the pulsation sound generated by the oil pump 10 is heard by the vehicle occupant. For this reason, in the present embodiment, when the oil discharge pressure is decreased in a situation where the discharge pressure sensor value PS is equal to or greater than the threshold value PSTh, the oil discharge pressure is set lower than when the discharge pressure sensor value PS is less than the threshold value PSTh. It is reduced to. As a result, the pulsating sound is gradually reduced, that is, the pulsating sound is suppressed from being rapidly reduced. That is, it becomes difficult to generate an event in which the pulsation sound heard by the vehicle occupant suddenly cannot be heard. Therefore, when reducing the oil discharge pressure, it is possible to make it difficult for the vehicle occupant to feel uncomfortable due to the change in the pulsating sound.

  When the oil discharge pressure is decreased by increasing the command current value Iocv at the second change speed VI2, the discharge pressure sensor value PS reaches the threshold value PSTh at the fifth timing t15. That is, the discharge pressure sensor value PS becomes less than the threshold value PSTh after the fifth timing t15. As described above, when the discharge pressure sensor value PS is less than the threshold value PSTh, it can be determined that it is difficult for the vehicle occupant to hear the pulsating sound. At this time, the command current value Iocv decreases at the first change speed VI1. Therefore, the rate at which the oil discharge pressure decreases is higher than before the fifth timing t15. Thereby, even when the discharge pressure sensor value PS becomes less than the threshold value PSTh, the amount of deviation between the target discharge pressure PTr and the discharge pressure sensor value PS is compared with the case where the command current value Iocv increases at the second change speed VI2. Early reduction can be suppressed. When the discharge pressure sensor value PS converges to the target discharge pressure PTr at the sixth timing t16 thereafter, the command current value Iocv is held.

  As described so far, when the discharge pressure sensor value PS is less than the threshold value PSTh, the target discharge pressure PTr may be set to a value larger than the threshold value PSTh. In this case, the command current value Iocv is decreased at the first change speed VI1 until the discharge pressure sensor value PS reaches the target discharge pressure PTr. Thus, by decreasing the command current value Iocv at the first change speed VI1, the oil discharge pressure quickly increases. When the discharge pressure sensor value PS reaches the threshold value PSTh, thereafter, the command current value Iocv is decreased at the second change speed VI2.

  Here, when the increase in the oil discharge pressure is continued under the situation where the discharge pressure sensor value PS is equal to or greater than the threshold value PSTh, the state where the pulsation noise is high is continued. In such a case, even if the change speed of the pulsating sound is large, it is difficult to give a sense of discomfort to the vehicle occupant. Therefore, in the present embodiment, even when the discharge pressure sensor value PS is equal to or greater than the threshold value PSTh, the duration Tm of decrease in the command current value Iocv at the second change speed VI2 is equal to or greater than the specified time TmTh. When this occurs, the command current value Iocv is decreased at the first change speed VI1 higher than the second change speed VI2. As a result, the target discharge pressure PTr and the discharge pressure sensor value can be increased by the amount by which the change speed of the oil discharge pressure can be increased compared to the case where the decrease in the command current value Iocv is continued at the second change speed VI2. The amount of deviation from PS can be difficult to increase. That is, when the duration Tm in the state where the command current value Iocv is changed by the speed reduction process reaches the specified time TmTh, the discharge pressure is set at a higher change speed than before the duration Tm reaches the specified time TmTh. Can be changed.

  The specified time TmTh is set as described above with reference to FIG. Therefore, even if the specified time TmTh is provided in this way, the target discharge pressure PTr is decreased, and the discharge pressure sensor value PS shifts from the state where the discharge pressure sensor value PS is greater than or equal to the threshold value PSTh to the state where the discharge pressure sensor value PS is less than the threshold value PSTh. Sometimes, the gradual decrease in the oil discharge pressure can be continued until the discharge pressure sensor value PS becomes less than the specified discharge pressure PSA (> PSTh). Therefore, even if the specified time TmTh that is a criterion for determining whether to continue or end the increase in the command current value Iocv at the second change speed VI2 is provided, the discharge pressure sensor value PS is greater than the specified discharge pressure PSA. Is not changed to the first change speed VI1 in a high state, and it can be suppressed that the pulsating sound is not heard suddenly.

  By the way, in the engine 200 in operation, sound is generated from other than the oil pump 10. Further, sounds other than the pulsating sound of the oil pump 10 tend to be louder as the engine rotational speed NE is higher. That is, when the engine speed NE is high, the pulsation sound of the oil pump 10 is easily masked by other sounds, and even if the pulsation sound becomes relatively large, it is difficult for the occupant to hear the pulsation sound. Therefore, in the present embodiment, the threshold value PSTh is set to a larger value as the engine rotational speed NE is higher. Therefore, it is possible to change the command current value Iocv at the second change speed VI2 only when the pulsation sound is easily heard by the driver. As a result, it is possible to suppress a decrease in the chance of changing the command current value Iocv at the first change speed VI1, and as a result, the amount of deviation between the target discharge pressure PTr and the discharge pressure sensor value PS is unlikely to increase.

The above embodiment may be changed to another embodiment as described below.
In the above embodiment, the threshold value PSTh is changed according to the engine speed NE. However, the threshold value PSTh may be changed according to parameters other than the engine rotation speed NE. The lower the oil temperature TMP, which is the temperature of the oil supplied to the oil pump 10, the higher the oil discharge pressure. Thus, in view of the fact that the discharge performance of the oil pump 10 changes according to the oil temperature TMP, the threshold value PSTh may be changed according to the oil temperature TMP.

Further, the higher the vehicle speed, the louder the traveling sound, and the pulsating sound is more easily masked by the traveling sound. Therefore, the threshold value PSTh may be increased as the vehicle speed increases.
The engine 200 is provided with a cam shaft for a valve such as an intake valve or an exhaust valve. Such a camshaft rotates in synchronization with the crankshaft. Therefore, the threshold value PSTh may be increased as the rotation speed of the camshaft detected by the sensor that detects the rotation speed of the camshaft is higher. Even in such a configuration, since there is a correspondence between the rotational speed of the camshaft and the engine rotational speed NE, the threshold value PSTh can be increased as the engine rotational speed NE is higher.

The threshold value PSTh may not be changed according to the engine speed NE. For example, the threshold value PSTh may be fixed at a predetermined value set in advance.
In the situation where the discharge pressure sensor value PS is equal to or greater than the threshold value PSTh, if the duration time Tm is equal to or greater than the specified time TmTh, the first change rate VI1 if the second change rate VI2 is higher. The command current value Iocv may be changed at a change speed different from the above. For example, in the situation where the discharge pressure sensor value PS is equal to or greater than the threshold value PSTh, when the duration time Tm is equal to or greater than the specified time TmTh, the difference ΔIocv is equal to or greater than “2” and less than “N”. The sum of the value divided by a small integer “M (for example, 2 when N is 3)” and the previous value of the command current value Iocv may be derived as the command current value Iocv. In this case, the instruction current value Iocv can be changed at a speed lower than the first change speed VI1 but higher than the second change speed VI2.

  In the above embodiment, when the command current value Iocv is decreased at the second change speed VI2 in order to increase the oil discharge pressure under the situation where the discharge pressure sensor value PS is equal to or greater than the threshold value PSTh, the above-described continuation is performed. After the time Tm becomes equal to or longer than the specified time TmTh, the command current value Iocv is decreased at a speed higher than the second change speed VI2. However, the present invention is not limited to this, and the method described in the above embodiment is the change in the change speed of the command current value Iocv when the oil discharge pressure is increased in a situation where the discharge pressure sensor value PS is equal to or greater than the threshold value PSTh. You may make it implement | achieve by a different method. For example, when the decrease amount of the command current value Iocv after starting the decrease of the command current value Iocv at the second change speed VI2 or the increase amount of the discharge pressure sensor value PS becomes a predetermined amount or more, The command current value Iocv may be decreased at a speed higher than the second change speed VI2. Even in this case, it is possible to suppress an increase in the amount of deviation between the target discharge pressure PTr and the discharge pressure sensor value PS when the oil discharge pressure is increased.

  When such a control configuration is adopted, when the discharge pressure of the oil is decreased in a situation where the discharge pressure sensor value PS is equal to or higher than the threshold value PSTh, the increase in the command current value Iocv at the second change speed VI2 is increased. Even if the increase amount of the command current value Iocv after the start or the decrease amount of the discharge pressure sensor value PS becomes a predetermined amount or more, the increase of the command current value Iocv at the second change speed VI2 is continued. May be. As a result, when the target discharge pressure PTr is decreased and the discharge pressure sensor value PS shifts from the state where the discharge pressure sensor value PS is equal to or greater than the threshold value PSTh to the state where the discharge pressure sensor value PS is less than the threshold value PSTh, the discharge pressure sensor value PS is equal to the specified discharge pressure PSA. Even if it becomes less than (> PSTh), the gradual decrease in the oil discharge pressure can be continued. For this reason, it is possible to prevent the pulsating sound from being suddenly heard when the oil discharge pressure is reduced.

  Even if the duration Tm in the state where the command current value Iocv is changed at the second change speed VI2 becomes equal to or longer than the specified time TmTh, the second change speed remains as long as the discharge pressure sensor value PS is equal to or higher than the threshold value PSTh. The change of the command current value Iocv at VI2 may be continued.

  When an oil discharge pressure is changed under a situation where the discharge pressure sensor value PS is equal to or greater than the threshold value PSTh, an upper limit value for a change amount per unit time of the command current value Iocv is set in advance, and this upper limit value is used. The change speed of the command current value Iocv may be controlled. That is, when the command current value Iocv is increased, the sum of the change value, which is the smaller value of the difference ΔIocv and the upper limit value, and the previous value of the command current value Iocv is set as the command current value Iocv. May be. Further, when the command current value Iocv is decreased, a difference obtained by subtracting the change value from the previous value of the command current value Iocv may be set as the command current value Iocv. Thereby, when the target discharge pressure PTr is changed so that the difference ΔIocv exceeds the upper limit value, the discharge pressure sensor value PS is less than the threshold value PSTh when the discharge pressure sensor value PS is greater than or equal to the threshold value PSTh. Also, the command current value Iocv can be changed gradually. As a result, it is possible to make it difficult for the vehicle occupant to feel uncomfortable due to a sudden change in the pulsating sound.

  In the case of such a control configuration, when the difference ΔIocv is less than the upper limit value under the situation where the discharge pressure sensor value PS is greater than or equal to the threshold value PSTh, the change rate of the oil discharge pressure is low and the pulsating sound is slow. Therefore, the change speed of the command current value Iocv is not limited. Therefore, an increase in the amount of deviation between the target discharge pressure PTr and the discharge pressure sensor value PS can be suppressed.

  When the oil discharge pressure is changed under a situation where the discharge pressure sensor value PS is equal to or higher than the threshold value PSTh, the change is lower than when the oil discharge pressure is changed under a situation where the discharge pressure sensor value PS is less than the threshold value PSTh. As long as the discharge pressure can be changed at a speed, the discharge pressure may be controlled by a method other than the method described in the above embodiment. For example, when the discharge pressure sensor value PS is equal to or greater than the threshold value PSTh, the gain used in the feedback control may be made smaller than when the discharge pressure sensor value PS is less than the threshold value PSTh. In this case, when the discharge pressure is changed under the situation where the discharge pressure sensor value PS is equal to or higher than the threshold value PSTh without performing the speed reduction process, the discharge pressure sensor value PS is less than the threshold value PSTh. The discharge pressure can be changed at a lower change speed than when the discharge pressure is changed below.

  For example, when the target discharge pressure PTr is changed, and the discharge pressure sensor value PS is less than the threshold value PSTh, the change speed of the discharge pressure is set to a first predetermined speed that is a predetermined constant value. When the discharge pressure sensor value PS is equal to or greater than the threshold value PSTh, the change speed of the discharge pressure may be set to a second specified speed that is a constant value lower than the first specified speed. Even in this case, when changing the discharge pressure in a situation where the discharge pressure sensor value PS is equal to or greater than the threshold value PSTh, when changing the discharge pressure in a situation where the discharge pressure sensor value PS is less than the threshold value PSTh. The discharge pressure can be changed at a lower change speed. Therefore, even if the discharge pressure sensor value PS is equal to or greater than the threshold value PSTh, compared with the case where the change speed of the oil discharge pressure is made equal to the first specified speed, the uncomfortable feeling caused by the sudden change in the pulsating sound is felt. Can be difficult to give.

  In the above embodiment, the oil supply device 210 includes a gear pump as the oil pump 10. However, the oil supply apparatus 210 may be configured to include another type of pump (for example, a vane pump) other than the gear pump as the oil pump 10.

  The oil pump may be an electric pump instead of an engine driven pump. In this case, the drive speed of the oil pump can be controlled by adjusting the rotation speed of the electric motor for driving the oil pump, that is, the command current value for the electric motor. As a result, the oil discharge pressure in the oil pump can be controlled. Can be controlled. In the oil supply apparatus including such an electric pump, the electric motor functions as an electric actuator that operates to change the oil discharge pressure in the oil pump.

DESCRIPTION OF SYMBOLS 10 ... Oil pump, 100A ... Actuator, 200 ... Engine, 210 ... Oil supply apparatus, 302 ... Threshold setting part, 303 ... Discharge pressure control part, 311 ... Discharge pressure sensor.

Claims (4)

An oil pump capable of changing the oil discharge pressure, a sensor for detecting the pressure of oil discharged from the oil pump, and a discharge pressure control unit for controlling the oil discharge pressure in the oil pump,
The discharge pressure control unit, when changing the oil discharge pressure in the oil pump under a situation where the discharge pressure sensor value, which is the oil pressure detected by the sensor, is greater than or equal to a threshold value, An oil supply device for an in-vehicle engine that changes the discharge pressure at a lower change speed than when the oil discharge pressure in the oil pump is changed under a condition that is less than the threshold. The oil pump changes oil discharge pressure by changing an indicated current value for an electric actuator,
The discharge pressure control unit
When changing the oil discharge pressure in the oil pump under the situation where the discharge pressure sensor value is less than the threshold value, it is derived by feedback control using a target discharge pressure for the oil pump and the discharge pressure sensor value. While changing the discharge pressure by inputting the command current value to the actuator,
The command current value derived by feedback control using the target discharge pressure and the discharge pressure sensor value when changing the oil discharge pressure in the oil pump under the situation where the discharge pressure sensor value is equal to or greater than the threshold value Is performed to change the indicated current value derived by the feedback control so that the discharge pressure changes at a change speed lower than the change speed of the discharge pressure when the actuator is input to the actuator. The in-vehicle engine oil supply device according to claim 1, wherein the indicated current value derived by the process is input to the actuator. The discharge pressure control unit is higher when the duration of the state where the command current value derived by the speed reduction process is input to the actuator reaches a specified time than before the specified time is reached. The oil supply device for an in-vehicle engine according to claim 2, wherein the discharge pressure is changed at a change speed. The in-vehicle engine oil supply device according to any one of claims 1 to 3, further comprising a threshold value setting unit that increases the threshold value as an engine rotation speed that is a rotation speed of an engine crankshaft is higher.

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