WO2021066009A1

WO2021066009A1 - Oil supply device to be used in internal combustion engine

Info

Publication number: WO2021066009A1
Application number: PCT/JP2020/037146
Authority: WO
Inventors: 務朝倉; 剛史鎌田; 理郎福岡
Original assignee: いすゞ自動車株式会社
Priority date: 2019-09-30
Filing date: 2020-09-30
Publication date: 2021-04-08
Also published as: CN114514361A; CN114514361B; JP2021055602A; DE112020004684T5

Abstract

Provided is an oil supply device to be used in an internal combustion engine and capable of stably performing an oil pump varying operation. This oil supply device to be used in an internal combustion engine is equipped with: an oil pump device which has a pump unit for discharging oil on the basis of the motive force of the internal combustion engine, and a varying part which has a control hydraulic chamber and operates so as to decrease the discharge amount from the pump unit when the hydraulic pressure of the oil supplied to the control hydraulic chamber reaches or exceeds a hydraulic pressure threshold; a solenoid valve which is provided to the oil passage connected to the control hydraulic chamber, and allows oil to be supplied to the control hydraulic chamber when said valve is open due to electricity being conducted thereto; and a control unit for executing a varying control for conducting electricity to the solenoid valve when the internal combustion engine is in a low load state and the rotation speed of the internal combustion engine is equal to or greater than a rotation speed threshold, and an adhesion suppression control for conducting electricity to the solenoid valve when the hydraulic pressure of the oil is less than a hydraulic pressure threshold.

Description

Internal combustion engine oil supply device

This disclosure relates to an oil supply device for an internal combustion engine.

Conventionally, an oil supply device for an internal combustion engine equipped with an oil pump capable of changing the amount of oil discharged has been known. Patent Document 1 discloses an oil supply device that is driven based on the rotation of a crankshaft connected to an internal combustion engine and pumps oil discharged from a discharge port to a component of the internal combustion engine.

The discharge amount of the oil pump disclosed in Patent Document 1 changes according to the control pressure. Such a control pressure is adjusted by a solenoid valve.

Japanese Patent Application Laid-Open No. 2014-317939

In the oil supply device as described above, if the solenoid valve does not operate normally, the variable operation for changing the discharge amount of the oil pump cannot be stably performed.

An object of the present disclosure is to provide an oil supply device for an internal combustion engine capable of stably performing variable operation of an oil pump.

The oil supply device for an internal combustion engine according to one aspect of the present disclosure is
It has a pump unit that discharges oil based on the power of the internal combustion engine and a control hydraulic chamber, and operates when the oil pressure supplied to the control hydraulic chamber is equal to or higher than the oil pressure threshold, reducing the discharge amount of the pump unit. An oil pump device having a variable portion and
A solenoid valve that is installed in the oil passage connected to the control hydraulic chamber and allows oil to be supplied to the control hydraulic chamber when it is opened based on energization.
Variable control that energizes the solenoid valve when the internal combustion engine is in a low load state and the rotation speed of the internal combustion engine is equal to or higher than the rotation speed threshold, and sticking suppression control that energizes the solenoid valve when the oil pressure is smaller than the hydraulic threshold It is provided with a control unit for carrying out.
The oil supply device for an internal combustion engine according to another aspect of the present disclosure is
An oil pump device that supplies oil to the internal combustion engine,
An oil pressure sensor that measures the oil pressure of the supplied oil,
A valve provided in the oil passage for supplying the oil to the oil pump device and opening and closing the oil passage,
A control unit that controls the opening and closing of the valve, and that, when the oil pressure is smaller than the threshold value, performs sticking suppression control for opening the valve again after the valve is closed.
To be equipped.

According to the present disclosure, it is possible to provide an oil supply device for an internal combustion engine capable of stably performing variable operation of an oil pump.

FIG. 1 is a diagram schematically showing an oil supply device for an internal combustion engine according to an embodiment. FIG. 2 is a flowchart for explaining variable control of the oil supply device implemented by the oil supply device of the internal combustion engine according to the embodiment. FIG. 3 is a flowchart for explaining the sticking suppression control of the solenoid valve carried out by the oil supply device of the internal combustion engine according to the embodiment. FIG. 4A is a diagram showing the relationship between the rotation speed of the internal combustion engine and the oil pressure of the oil supply device according to the reference example. FIG. 4B is a diagram showing an example of the relationship between the rotation speed of the internal combustion engine and the oil pressure of the oil supply device according to the embodiment. FIG. 4C is a diagram showing an example of the relationship between the rotation speed of the internal combustion engine and the oil pressure of the oil supply device according to the embodiment. FIG. 4D is a diagram showing an example of the relationship between the rotation speed of the internal combustion engine and the oil pressure of the oil supply device according to the embodiment.

Hereinafter, an example of the embodiment according to the present disclosure will be described in detail based on the drawings. The oil supply device for the internal combustion engine according to the embodiment described later is an example of the oil supply device for the internal combustion engine according to the present disclosure, and the present disclosure is not limited to the embodiment described later.

[Embodiment]
The oil supply device 1 of the internal combustion engine according to the present embodiment will be described with reference to FIGS. 1 and 2.

FIG. 1 is a schematic diagram for explaining the configuration of the oil supply device 1. Hereinafter, regarding the structure of the oil supply device 1, only the structure necessary for explaining the characteristic portion of the oil supply device 1 will be described. Other structures in the oil supply device 1 may be the same as the structures of various conventionally known oil supply devices.

<Oil supply device>
The oil supply device 1 is applied to the internal combustion engine E, and supplies oil for lubrication or cooling to a component (for example, a piston) of the internal combustion engine E.

The internal combustion engine E is, for example, a diesel engine mounted on a truck or the like, or a gasoline engine mounted on a passenger car or the like. Since the structure of the internal combustion engine E is the same as that of various conventionally known internal combustion engines, detailed description thereof will be omitted.

The oil supply device 1 has a variable oil pump device 2, a variable control unit 3, and an oil pan 4. Each element 2 to 4 of such an oil supply device 1 is connected by an oil passage L1.

The structure of the oil supply device 1 is not limited to the structure shown in the figure. Although not shown, the oil supply device 1 includes, for example, a main gallery which is a passage for oil discharged from an oil pump device 2, an oil filter for filtering oil, an oil cooler for cooling oil, and an internal combustion engine. It may have a supply unit (nozzle, etc.) for supplying oil to the constituent members of the engine.

First, the flow of oil in the oil supply device 1 will be briefly described. The oil in the oil pan 4 flows into the oil pump device 2 through the oil passage element L11 of the oil passage L1. The oil flowing into the oil pump device 2 is boosted by the oil pump device 2 and discharged from the oil pump device 2 to the oil passage element L12 of the oil passage L1.

The oil discharged from the oil pump device 2 to the oil passage element L12 is pressure-fed to a component (for example, a piston) of the internal combustion engine E.

Further, a part of the oil discharged from the oil pump device 2 to the oil passage element L12 branches from the oil passage element L12 and flows into the oil passage element L13. When the solenoid valve 31 of the variable control unit 3 is closed (hereinafter, simply referred to as “closed state”), the oil flowing into the oil passage element L13 is stopped by the solenoid valve 31.

On the other hand, when the solenoid valve 31 is open (hereinafter, simply referred to as "open state"), the oil that has flowed into the oil passage element L13 flows into the oil passage element L14 of the oil passage L1 through the solenoid valve 31. To do. Then, the oil that has flowed into the oil passage element L14 flows into the control hydraulic chamber 221 of the variable portion 22 (described later). The oil pump device 2 operates based on the oil pressure in the control hydraulic chamber 221 to change the discharge amount of the oil discharged from the oil pump device 2. Hereinafter, a specific configuration of the oil supply device 1 will be described.

<Oil pump device>
The oil pump device 2 is, for example, a variable vane pump capable of changing the discharge amount. The oil pump device 2 is driven based on the power of the internal combustion engine E. Specifically, the oil pump device 2 is connected to a crankshaft (not shown) connected to the internal combustion engine E, and is driven by the rotation of the crankshaft.

The discharge amount of the oil pump device 2 is the capacity of the oil discharged from the oil pump device 2 when the drive shaft 212 (described later) of the oil pump device 2 makes one rotation. The oil pump device 2 of the present embodiment can switch the discharge amount between the first discharge amount and the second discharge amount smaller than the first discharge amount.

Such an oil pump device 2 has a pump unit 21 and a variable unit 22.

<Pump section>
The pump unit 21 includes a housing 211, a drive shaft 212, a rotor 213, a plurality of vanes 214, and a cam ring 215.

The housing 211 has a tubular accommodating portion 211a. The accommodating portion 211a accommodates elements 212 to 215 and the like constituting the pump portion 21.

The housing 211 has a suction port 211b, a discharge port 211c, and an introduction port 211d.

The suction port 211b is an inlet for oil supplied to the pump chamber 216 (described later). An oil passage element L11 is connected to the suction port 211b. The first end (upstream end) of the oil passage element L11 is connected to the oil pan 4, and the second end (downstream end) is connected to the suction port 211b.

The discharge port 211c is an outlet for oil discharged from the pump chamber 216. A first end portion (downstream end portion) of the oil passage element L12 is connected to the discharge port 211c.

The introduction port 211d is an inlet for oil supplied to the control hydraulic chamber 221 (described later). An oil passage element L14 is connected to the introduction port 211d. The first end (upstream end) of the oil passage element L14 is connected to the second port 312 of the solenoid valve 31 (described later). The second end (downstream end) of the oil passage element L14 is connected to the introduction port 211d.

The drive shaft 212 is rotatably supported by a shaft support portion (not shown) of the housing 211. The drive shaft 212 is connected to the crankshaft and rotates by the rotation of the crankshaft.

The rotor 213 is fixed to the outer peripheral surface of the drive shaft 212. The rotor 213 rotates together with the drive shaft 212. Specifically, the rotor 213 is a tubular member having a central hole (not shown). A drive shaft 212 is inserted through the stop hole of the rotor 213.

Further, the rotor 213 has slits 213a provided at equal intervals in the circumferential direction on the outer peripheral surface. Each of the slits 213a extends in the axial direction of the rotor 213. Each such slit 213a supports vane 214.

Each of the vanes 214 is a plate-shaped member, and is supported by the slit 213a of the rotor 213 in a state of being movable in the radial direction of the rotor 213. That is, each vane 214 is configured so that the amount of protrusion from the outer peripheral surface of the rotor 213 can be changed.

The cam ring 215 is a tubular member and is provided so as to surround the outer peripheral surface of the rotor 213. The cam ring 215 is supported by the housing 211 in a state where it can be eccentric with respect to the central axis of the rotor 213. The amount of eccentricity of the cam ring 215 with respect to the rotor 213 changes based on the oil pressure of the oil supplied to the control hydraulic chamber 221.

The cam ring 215 has a plate-shaped flange portion 215a on a part of the outer peripheral surface. A plurality of pump chambers 216 separated by vanes 214 are provided between the inner peripheral surface of the cam ring 215 and the outer peripheral surface of the rotor 213.

The volume of each pump chamber 216 changes according to the amount of eccentricity of the cam ring 215 with respect to the rotor 213. When the volume of the pump chamber 216 changes, the discharge amount of the pump unit 21 changes.

The oil sucked up from the oil pan 4 is supplied to the pump chamber 216 through the suction port 211b. Further, the oil in the pump chamber 216 is discharged to the oil passage element L12 through the discharge port 211c.

<Variable part>
The variable unit 22 changes the discharge amount of the pump unit 21 under the control of the variable control unit 3 (described later). The variable portion 22 has a control hydraulic chamber 221 and a spring 222.

The control hydraulic chamber 221 is a space surrounded by the inner surface of the housing 211 and the outer peripheral surface of the cam ring 215. The oil discharged from the second port 312 of the solenoid valve 31 is supplied to the control hydraulic chamber 221 through the oil passage element L14 and the introduction port 211d.

The spring 222 is a coil spring and is provided between the inner surface of the housing 211 and the flange portion 215a of the cam ring 215.

The spring 222 constantly urges the cam ring 215 in the first direction. Such a spring 222 contracts when the oil pressure of the oil supplied to the control hydraulic chamber 221 is equal to or higher than the oil pressure threshold value.

When the spring 222 contracts, the amount of eccentricity of the cam ring 215 with respect to the rotor 213 changes, and the volume of the pump chamber 216 changes. In the case of the present embodiment, when the spring 222 contracts, the volume of the pump chamber 216 becomes smaller. As a result, the discharge amount of the pump unit 21 is reduced.

The structure of the oil pump device is not limited to the above-mentioned structure. The oil pump device may be various conventionally known variable oil pump devices.

<Variable control unit>
The variable control unit 3 controls the supply state of oil to the variable unit 22 (specifically, the control hydraulic chamber 221). The variable control unit 3 has a solenoid valve 31 and a control unit 32.

<Solenoid valve>
The solenoid valve 31 switches between a closed state and an open state under the control of the control unit 32 (described later). The solenoid valve 31 connects the first port 311 and the second port 312 in a state in which oil can flow in a state of being energized (hereinafter, referred to as an “energized state”). The energized state of the solenoid valve 31 (in other words, the state in which the first port 311 and the second port 312 are connected) corresponds to the open state of the solenoid valve 31.

Further, the solenoid valve 31 shuts off the first port 311 and the second port 312 in a state where it is not energized (hereinafter, referred to as "non-energized state"). The non-energized state of the solenoid valve 31 (the state in which the first port 311 and the second port 312 are cut off) corresponds to the closed state of the solenoid valve 31.

Such a solenoid valve 31 is provided in an oil passage connecting the discharge port 211c of the oil pump device 2 and the introduction port 211d of the oil pump device 2.

Specifically, the solenoid valve 31 is provided between the oil passage element L13 and the oil passage element L14. The first end (upstream end) of the oil passage element L13 is connected to the oil passage element L12. The second end (downstream end) of the oil passage element L13 is connected to the first port 311 of the solenoid valve 31.

The first end (upstream end) of the oil passage element L14 is connected to the second port 312 of the solenoid valve 31. The second end (downstream end) of the oil passage element L14 is connected to the introduction port 211d of the oil pump device 2.

The structure of the solenoid valve is not limited to the above-mentioned structure. As the solenoid valve, various conventionally known solenoid valves can be adopted.

<Control unit>
The control unit 32 controls the oil supply device 1, and includes a known CPU, ROM, RAM, input port, output port, and the like. The control unit 32 is connected to the solenoid valve 31 via a transmission line 5. The control unit 32 may be a control device that controls various types of vehicles, or may be a control device provided exclusively for the oil supply device 1.

Specifically, the control unit 32 switches the open / closed state of the solenoid valve 31 by controlling the energized state of the solenoid valve 31. The specific function of the control unit 32 will be described in detail in the description of the variable control of the oil pump device.

<Variable control of oil pump device and sticking suppression control>
Hereinafter, the variable control and the sticking suppression control of the oil pump device implemented by the oil supply device 1 according to the present embodiment will be described with reference to FIGS. 2 and 3.

FIG. 2 is a flowchart showing variable control of the oil pump (hereinafter, simply referred to as “variable control”) carried out by the oil supply device 1. Further, FIG. 3 is a flowchart showing the sticking suppression control (hereinafter, simply referred to as “sticking suppression control”) carried out by the oil supply device 1. The operations shown in FIGS. 2 and 3 are performed by the control unit 32.

First, the outline of the variable control of the oil pump device according to the present embodiment will be described. The variable control of the oil pump device shown in FIG. 2 is repeatedly performed in the operating state of the internal combustion engine E. When the internal combustion engine E starts, the crankshaft connected to the internal combustion engine E rotates. Then, the oil pump device 2 is driven based on the rotation of the crankshaft.

In the driving state of the oil pump device 2, the oil discharged from the oil pump device 2 is pressure-fed to a component (for example, a piston) of the internal combustion engine E.

When the variable portion 22 is not operating in the driving state of the oil pump device 2, the discharge amount of oil discharged from the oil pump device 2 is the first discharge amount. In the oil pump device 2, the state in which the variable portion 22 is not operating (that is, the state in which the oil pump device 2 is not variable) is also referred to as a non-variable state of the oil pump device 2.

On the other hand, when the variable portion 22 is operating in the driving state of the oil pump device 2, the discharge amount of oil discharged from the oil pump device 2 is a second discharge amount smaller than the first discharge amount. In the oil pump device 2, the state in which the variable portion 22 is operating (that is, the state in which the oil pump device 2 is variable) is also referred to as a variable state of the oil pump device 2.

The control unit 32 controls the variable unit 22 based on the information regarding the load of the internal combustion engine E and the information regarding the oil temperature of the oil. The above-mentioned control performed by the control unit 32 is variable control of the oil supply device. Hereinafter, specific processes of variable control and sticking suppression control of the oil pump device will be described with reference to FIGS. 2 and 3.

In step S101 of FIG. 2, the control unit 32 acquires information on the load of the internal combustion engine E in order to determine the load state of the internal combustion engine E. The information regarding the load of the internal combustion engine E may be a detection value of a sensor provided in the vehicle.

The information regarding the load of the internal combustion engine E is, for example, information regarding the injection amount of a fuel injection device (not shown) that injects fuel into the combustion chamber of the internal combustion engine E (hereinafter, referred to as “information regarding the fuel injection amount”). It's okay. Further, the information regarding the load of the internal combustion engine E may be, for example, information regarding the opening degree of the throttle valve of the internal combustion engine E or information regarding the opening degree of the accelerator.

In step S102, the control unit 32 determines whether or not the internal combustion engine E is in a low load state based on the acquired information regarding the load of the internal combustion engine E.

Specifically, when the information regarding the load of the internal combustion engine E is the information regarding the fuel injection amount, the control unit 32 determines in step S102 whether or not the fuel injection amount is equal to or less than the injection amount threshold.

When the fuel injection amount is equal to or less than the injection amount threshold value, the control unit 32 determines that the internal combustion engine E is in a low load state. On the other hand, when the fuel injection amount is larger than the injection amount threshold value, the control unit 32 determines that the internal combustion engine E is not in the low load state. A state in which the fuel injection amount is larger than the injection amount threshold value is also referred to as a high load state of the internal combustion engine E.

When the internal combustion engine E is in a low load state (“YES” in step S102), the control unit 32 shifts the control process to step S103.

On the other hand, when the internal combustion engine E is not in the low load state (“NO” in step S102), the control unit 32 shifts the control process to step S110.

In step S103, the control unit 32 acquires information regarding the temperature of the oil. The information about the temperature of the oil may be the detection value of the sensor provided in the vehicle. That is, the control unit 32 acquires information on the temperature of the oil from the sensor.

The information on the oil temperature is not limited to the oil temperature, but may be any information that correlates with the oil temperature. For example, the temperature information may be the temperature of the cooling water for cooling the engine, which is acquired by the water temperature sensor. Further, the information regarding the temperature may be the temperature of the oil obtained by converting the temperature of the cooling water.

In step S104, the control unit 32 determines whether or not the oil is in a low temperature state based on the acquired information on the temperature of the oil.

Specifically, in step S104, the control unit 32 determines whether or not the temperature indicated by the information regarding the oil temperature (for example, the temperature of the oil and the temperature of the cooling water) is equal to or less than the temperature threshold value.

When the temperature indicated by the information on the temperature of the oil is equal to or lower than the temperature threshold value, the control unit 32 determines that the oil is in a low temperature state.

On the other hand, when the temperature indicated by the information on the temperature of the oil is larger than the temperature threshold value, the control unit 32 determines that the oil is not in a low temperature state. The state in which the temperature indicated by the information on the temperature of the oil is larger than the temperature threshold value is also referred to as a non-low temperature state of the oil. The non-low temperature state is a first high temperature state higher than the first temperature (also referred to as the first temperature threshold value) and corresponding to the second temperature (also referred to as the second temperature threshold value) or less, and a second high temperature state higher than the second temperature. It may be divided into states and.

When the oil is in a low temperature state (“YES” in step S104), the control unit 32 shifts the control process to step S105.

On the other hand, when the oil is not in a low temperature state (“NO” in step S104), the control unit 32 shifts the control process to step S106.

In step S105, the control unit 32 sets the rotation speed threshold value as the first rotation speed. As described above, when the internal combustion engine E is in the low load state and the oil is in the low temperature state, the control unit 32 sets the value of the rotation speed threshold value as the first rotation speed.

On the other hand, in step S106, the control unit 32 sets the rotation speed threshold value as the second rotation speed. The second rotation speed is larger than the first rotation speed. The control unit 32 may set the second rotation speed in advance in the rotation speed threshold value when the internal combustion engine E is started.

In this way, the control unit 32 sets the rotation speed threshold value as the second rotation speed when the internal combustion engine E is in the low load state and the oil is in the non-low temperature state. Then, the control unit 32 shifts the control process to step S107.

Although not shown, the control unit 32 may perform a process of determining whether or not the oil state corresponds to the second high temperature state before executing step S106. Then, when the oil state corresponds to the second high temperature state, the control unit 32 may shift the control process to step S110.

That is, the control unit 32 controls the oil pump device 2 so as not to change when the oil state corresponds to the second high temperature state. When the oil state does not correspond to the second high temperature state (that is, when the oil state corresponds to the first high temperature state), the control unit 32 may shift the control process to step S106.

In step S107, the control unit 32 acquires information regarding the rotation speed of the internal combustion engine E (for example, the rotation speed of the crankshaft). The information regarding the rotation speed of the internal combustion engine E may be a detection value of a sensor provided in the vehicle. That is, the control unit 32 acquires information on the rotation speed of the internal combustion engine E from the sensor.

In step S108, the control unit 32 determines whether or not the rotation speed of the internal combustion engine E is equal to or higher than the rotation speed threshold value based on the acquired information on the rotation speed of the internal combustion engine E.

When the rotation speed of the internal combustion engine E is equal to or higher than the rotation speed threshold value (“YES” in step S108), the control unit 32 shifts the control process to step S109.

On the other hand, when the rotation speed of the internal combustion engine E is smaller than the rotation speed threshold value (“NO” in step S108), the control unit 32 shifts the control process to step S110.

In step S109, the control unit 32 energizes the solenoid valve 31 to open the solenoid valve 31. In the open state of the solenoid valve 31, a part of the oil discharged from the pump unit 21 flows into the control hydraulic chamber 221 through the solenoid valve 31 and the introduction port 211d.

When the oil pressure of the oil flowing into the control hydraulic chamber 221 is equal to or higher than the oil pressure threshold value, the variable unit 22 operates. When the variable portion 22 operates, the spring 222 contracts and the amount of eccentricity of the cam ring 215 with respect to the rotor 213 changes.

As a result, the volume of the pump chamber 216 is reduced, and the amount of oil discharged from the pump unit 21 is reduced. That is, the oil pump device 2 is in a variable state. In the variable state of the oil pump device 2, the discharge amount of oil discharged from the pump unit 21 is the second discharge amount.

On the other hand, if the oil pressure flowing into the control hydraulic chamber 221 is less than the oil pressure threshold value, the variable unit 22 does not operate. As a result, the volume of the pump chamber 216 does not change, and the amount of oil discharged from the pump unit 21 does not change. That is, the oil pump device 2 is in a non-variable state. In the non-variable state of the oil pump device 2, the discharge amount of oil discharged from the pump unit 21 is the first discharge amount.

If the solenoid valve 31 is already in the open state in step S109, the control unit 32 maintains the solenoid valve 31 in the open state. On the other hand, in step S109, when the solenoid valve 31 is in the closed state, the control unit 32 energizes the solenoid valve 31 to open the solenoid valve 31.

In step S110, the control unit 32 does not energize the solenoid valve 31, and closes the solenoid valve 31. If the solenoid valve 31 is already in the closed state in step S110, the control unit 32 keeps the solenoid valve 31 in the closed state. On the other hand, in step S110, when the solenoid valve 31 is in the open state, the control unit 32 stops the energization of the solenoid valve 31 to close the solenoid valve 31.

In the closed state of the solenoid valve 31, the oil discharged from the pump unit 21 does not flow into the control hydraulic chamber 221, so the variable unit 22 does not operate. Therefore, the discharge amount of the oil discharged from the pump unit 21 is the first discharge amount.

In step S111, the control unit 32 implements sticking suppression control for suppressing sticking of the solenoid valve 31.

First, the reason for implementing the sticking suppression control will be explained. In the oil supply device 1 according to the present embodiment, the conditions under which the oil pump device 2 is variable (hereinafter, referred to as "variable condition of the oil pump device") are such that the rotation speed of the internal combustion engine E is equal to or higher than the rotation speed threshold value. The oil pressure in the control hydraulic chamber 221 is equal to or higher than the oil pressure threshold.

In such an oil supply device 1, when the rotation speed of the internal combustion engine E is equal to or higher than the rotation speed threshold value, the solenoid valve 31 is opened and oil is supplied to the control hydraulic chamber 221. Then, when the oil pressure in the control hydraulic chamber 221 is equal to or higher than the oil pressure threshold value, the variable unit 22 operates to change the oil pump device 2.

For example, if the rotation speed of the internal combustion engine E is lower than the rotation speed threshold value for a long time, the solenoid valve 31 may stick. If the solenoid valve 31 is stuck, the solenoid valve 31 may not operate normally. Therefore, the oil supply device 1 according to the present embodiment is configured to suppress sticking of the solenoid valve 31 by energizing the solenoid valve 31 in a state where the rotation speed of the internal combustion engine E is lower than the rotation speed threshold. There is. Hereinafter, sticking suppression control will be described with reference to FIG.

First, in step S1111, the control unit 32 acquires information regarding the oil pressure. The information regarding the oil pressure may be the detection value of the oil pressure sensor provided in the vehicle.

For example, in the hydraulic sensor, the oil supplied to the control hydraulic chamber 221 may be provided in the passage oil passage (specifically, the oil passage element L12 or the oil passage element L13). Alternatively, the oil pressure sensor may be provided in the oil supply device 1 at a portion (for example, the main gallery) where oil having a hydraulic pressure equal to that of the oil supplied to the control hydraulic chamber 221 flows.

In step S1112, the control unit 32 determines whether or not the oil state corresponds to the low pressure state based on the acquired information on the oil pressure.

Specifically, in step S1112, the control unit 32 determines whether or not the oil pressure of the oil is less than the oil pressure threshold value. As described above, the oil pressure threshold value is the oil pressure required for the variable unit 22 to operate. Therefore, the low pressure state of the oil may be regarded as a state in which the oil pressure of the oil is lower than the pressure required for the variable portion 22 to operate. The state in which the oil pressure is equal to or higher than the oil pressure threshold is also referred to as a non-low pressure state of the oil.

When the oil state corresponds to the low pressure state (“YES” in step S1112), the control unit 32 shifts the control process to step S1113.

On the other hand, when the oil state does not correspond to the low pressure state (“NO” in step S1112), the control unit 32 ends the sticking suppression control.

In step S1113, the control unit 32 energizes the solenoid valve 31 to open the solenoid valve 31. The control unit 32 may stop the energization of the solenoid valve 31 after a predetermined time has elapsed from the start of energization of the solenoid valve 31. Alternatively, the control unit 32 stops energizing the solenoid valve 31 after a lapse of a time determined according to the oil pressure after starting energization of the solenoid valve 31 instead of after the elapse of a predetermined time. May be good. Alternatively, the control unit 32 may stop energizing the solenoid valve 31 when the oil pressure exceeds the oil pressure threshold after starting energization of the solenoid valve 31 instead of after the lapse of a predetermined time. Good.

In this way, the control unit 32 opens the solenoid valve 31 by energizing the solenoid valve 31 in the low pressure state of the oil. Even if the solenoid valve 31 is opened in step S1113, the oil pump device 2 is not in the variable state because the oil is in the low pressure state.

<Modification example 1>
A modification 1 of the sticking suppression control will be described. The control unit 32 may acquire the elapsed time (integrated time) since the solenoid valve 31 was last energized. Then, when the acquired elapsed time (integrated time) is equal to or greater than the time threshold value, the control unit 32 may perform sticking suppression control. Such an elapsed time (integrated time) is an integration of the time when the solenoid valve 31 is not energized in the ON state of the internal combustion engine E and the time when the solenoid valve 31 is not energized in the OFF state of the internal combustion engine E. It's okay.

For example, the control unit 32 may determine whether or not the acquired integration time is equal to or greater than the time threshold value between step S110 and step S111 in FIG. Then, when the acquired integration time is equal to or longer than the time threshold value, the control unit 32 may skip the sticking suppression process in step S111.

Alternatively, the control unit 32 may determine whether or not the acquired integration time is equal to or greater than the time threshold value between step S1112 and step S1113 in FIG. Then, when the acquired integration time is equal to or longer than the time threshold value, the control unit 32 may skip the control process in step S1113.

As described above, in the case of the sticking suppression control according to the first modification, the timing for opening the solenoid valve 31 is determined based on the integrated time when the solenoid valve 31 is not energized. Therefore, the process of opening the solenoid valve 31 in the sticking suppression control is not repeated unnecessarily.

<Modification 2>
Next, a modification 2 of the sticking suppression control will be described. The control unit 32 may perform sticking suppression control when the oil state does not correspond to the above-mentioned second high temperature state. In other words, the control unit 32 does not have to perform the sticking suppression control when the oil state corresponds to the second high temperature state.

For example, the control unit 32 may determine whether or not the oil state corresponds to the second high temperature state between step S110 and step S111 in FIG. Specifically, the control unit 32 determines whether or not the temperature of the oil is higher than the above-mentioned second temperature threshold value.

Alternatively, the control unit 32 may determine whether or not the oil state corresponds to the second high temperature state between step S1112 and step S1113 in FIG. Then, when the oil state corresponds to the second high temperature state, the control unit 32 may skip the control process in step S1113.

When the oil is in the second high temperature state, it is necessary to supply a large amount of oil to the components of the internal combustion engine E to cool the components. Therefore, when the oil is in the second high temperature state, the control unit 32 skips the process of opening the solenoid valve 31 in the sticking suppression control. As a result, even if the oil pressure rises, the variable portion 22 operates and the discharge amount of the oil pump device 2 does not decrease. Therefore, the constituent members of the internal combustion engine E can be efficiently cooled in the second high temperature state of the oil.

In the case of the oil supply device according to the present embodiment, there is a situation in which the solenoid valve 31 is opened in a high load state of the internal combustion engine E. Specifically, in the solenoid valve sticking suppression control, when the oil is in a low pressure state, the solenoid valve 31 is opened in a high load state of the internal combustion engine E. However, since the oil is in a low pressure state, the variable portion 22 does not operate. Therefore, the oil pump device 2 does not become a variable state in the high load state of the internal combustion engine E.

Further, in the case of variable control of the oil supply device according to the present embodiment, when the internal combustion engine E is in a low load state and the rotation speed of the internal combustion engine E is smaller than the rotation speed threshold (first rotation speed or second rotation speed). There is a situation in which the solenoid valve 31 is opened.

Specifically, in the sticking suppression control, when the oil is in a low pressure state, the internal combustion engine E is in a low load state and the rotation speed of the internal combustion engine E is smaller than the rotation speed threshold (first rotation speed or second rotation speed). However, the solenoid valve 31 is opened. However, since the oil is in a low pressure state, the variable portion 22 does not operate. Therefore, when the internal combustion engine E is in a low load state and the rotation speed of the internal combustion engine E is smaller than the rotation speed threshold value (first rotation speed or second rotation speed), the oil pump device 2 may be in a variable state. Absent.

<Action / effect of this embodiment>
As described above, in the case of the oil supply device 1 according to the present embodiment, the sticking of the solenoid valve can be suppressed by performing the sticking suppression control of the solenoid valve as described above. As a result, the variable operation of the oil pump device 2 can be stably performed.

Further, in the case of the oil supply device 1 according to the present embodiment, the oil pump device 2 is set to a variable state at an appropriate timing in a low load state of the internal combustion engine E in which the amount of oil required by the internal combustion engine E is small. Therefore, the discharge amount of the oil pump device 2 can be reduced. As a result, the drive loss in the oil pump device 2 is reduced, and the fuel efficiency performance of the internal combustion engine is improved.

Further, when the oil is in a low temperature state, the variable portion 22 can be operated at an appropriate timing. As a result, the torque shock of the internal combustion engine E generated based on the operation of the variable portion 22 can be reduced.

The reason for this will be described with reference to FIGS. 4A to 4D. FIG. 4A shows the rotation speed of the internal combustion engine E and the discharge from the pump unit 21 when the variable portion operates in a low load state of the internal combustion engine E and a low temperature state of the oil with respect to the oil supply device according to the reference example. It is a diagram which shows the relationship with the oil pressure of oil. The oil supply device according to the reference example may be regarded as an oil supply device in which the variable control of the oil pump device of the present embodiment is not performed.

4B to 4D are diagrams showing the relationship between the rotation speed of the internal combustion engine E and the oil pressure of the oil discharged from the pump unit 21 with respect to the oil supply device 1 according to the present embodiment.

Specifically, FIG. 4B shows the rotation speed of the internal combustion engine E when the variable portion 22 is operated in a low load state of the internal combustion engine E in which the amount of oil required by the internal combustion engine E is small and a low temperature state of the oil. Is a diagram showing the relationship between the oil pressure and the oil pressure discharged from the pump unit 21.

FIG. 4C shows the rotation speed of the internal combustion engine E when the variable portion 22 does not operate in a high load state of the internal combustion engine E in which the amount of oil required by the internal combustion engine E is large and in a non-low temperature state of the oil. It is a diagram which shows the relationship with the oil pressure of the oil discharged from a pump part 21.

FIG. 4D shows the rotation speed of the internal combustion engine E and the pump unit when the variable portion 22 is operated in a low load state of the internal combustion engine E with a large amount of oil required by the internal combustion engine E and a non-low temperature state of the oil. It is a diagram which shows the relationship with the oil pressure of the oil discharged from 21.

Here, in both the oil supply device 1 according to the present embodiment and the oil supply device according to the reference example, the variable unit 22 operates when the oil pressure in the control hydraulic chamber 221 becomes P1 or higher.

Further, the oil pressure in the control hydraulic chamber 221 is equal to the oil pressure of the oil discharged from the pump unit 21. Further, in the case of the oil supply device according to the reference example, the rotation speed threshold value at which the solenoid valve 31 is opened is the first rotation speed (that is, the rotation speed N1).

On the other hand, in the case of the oil supply device 1 according to the present embodiment, the rotation speed threshold value at which the solenoid valve 31 is opened in the low load state of the internal combustion engine E and the low temperature state of the oil is the second rotation speed (that is, the rotation speed). N2).

Further, in the case of the oil supply device 1 according to the present embodiment, the rotation speed threshold value at which the solenoid valve 31 is opened in the low load state of the internal combustion engine E and the non-low temperature state of the oil is the first rotation speed (that is, rotation). The number N1).

Since the viscosity of the oil in the low temperature state is higher than the viscosity of the oil in the high temperature state, the rising speed of the oil in the low temperature state (see FIG. 4A) is faster than the rising speed of the oil in the high temperature state (see FIG. 4D).

In the case of FIG. 4A, the oil pressure in the control hydraulic chamber 221 is P1 at the rotation speed N2. However, even if the oil pressure in the control hydraulic chamber 221 is P1, the oil is not supplied to the control hydraulic chamber 221 because the solenoid valve 31 is in the closed state. Therefore, the variable portion 22 does not operate at the rotation speed N2.

In the case of FIG. 4A, at the rotation speed N1 of the internal combustion engine E, the solenoid valve 31 is opened and oil is supplied to the control hydraulic chamber 221. As a result, the variable portion 22 operates to reduce the discharge amount of the oil pump device 2. As a result, as shown in FIG. 4A, the oil pressure decreases from P2 to P1. A torque shock is generated in the internal combustion engine E due to such a fluctuation of the oil pressure.

On the other hand, in the case of the oil supply device 1 according to the present embodiment, in the low load state of the internal combustion engine E and the low temperature state of the oil, as shown in FIG. 4B, the oil pressure in the control hydraulic chamber 221 is changed at the rotation speed N2. It becomes P1 and the solenoid valve 31 is opened. As a result, the variable portion 22 operates at the rotation speed N2. As shown in FIG. 4B, the oil pressure does not fluctuate significantly from P1 even if the discharge amount of the pump unit 21 decreases. Therefore, the occurrence of torque shock in the internal combustion engine E due to the fluctuation of the oil pressure is suppressed.

Further, in the case of the oil supply device 1 according to the present embodiment, in the low load state of the internal combustion engine E and the high temperature state of the oil, as shown in FIG. 4, the oil pressure in the control hydraulic chamber 221 is changed at the rotation speed N1. It becomes P1 and the solenoid valve 31 is opened. As a result, the variable portion 22 operates at the rotation speed N1. As shown in FIG. 4C, the oil pressure does not fluctuate significantly from P1 even if the discharge amount of the pump unit 21 decreases. Therefore, the occurrence of torque shock in the internal combustion engine E due to the fluctuation of the oil pressure is suppressed.

This application is based on a Japanese patent application (Japanese Patent Application No. 2019-197881) filed on September 30, 2019, the contents of which are incorporated herein by reference.

The oil supply device according to the present disclosure can be applied not only to a diesel engine but also to various internal combustion engines such as a gasoline engine.

1 Oil supply device 2 Oil pump device 21 Pump section 211 Housing 211a Storage section

211b Suction port

211c Discharge port

211d Introduction port 212 Drive shaft 213 Rotor 213a Slit 214 Vane 215 Cam ring 215a Flange section 216 Pump room 22 Variable section 221 Control hydraulic chamber 222 Spring 3 Variable control unit 31 Solvent valve 311 1st port 312 2nd port 32 Control unit 4 Oil pan 5 Transmission line L1 Oil passage L11, L12, L13, L14 Oil passage element E Internal engine

Claims

An oil pump device that supplies oil to the internal combustion engine,
An oil pressure sensor that measures the oil pressure of the supplied oil,
A valve provided in the oil passage for supplying the oil to the oil pump device and opening and closing the oil passage,
A control unit that controls the opening and closing of the valve, and that, when the oil pressure is smaller than the threshold value, performs sticking suppression control for opening the valve again after the valve is closed.
An internal combustion engine oil supply device.
The control unit closes the valve when the internal combustion engine is in a high load state or the rotation speed of the internal combustion engine is smaller than the threshold value.
The oil supply device for an internal combustion engine according to claim 1.
The oil supply device for an internal combustion engine according to claim 2, wherein the control unit executes the sticking suppression control when the oil pressure is smaller than the threshold value and the rotation speed of the internal combustion engine is less than the threshold value.
The oil supply device for an internal combustion engine according to claim 2, wherein the control unit executes the sticking suppression control when the oil pressure is smaller than the threshold value and the internal combustion engine is in a high load state.
The oil for an internal combustion engine according to claim 2, wherein the control unit executes the sticking suppression control when the oil pressure is smaller than the threshold value and the elapsed time since the valve was opened last time is equal to or longer than the threshold value. Feeding device.
The oil supply device for an internal combustion engine according to claim 2, wherein the control unit executes the sticking suppression control when the oil pressure is smaller than the threshold value and the temperature of the oil is lower than the threshold value.