CN114514361A

CN114514361A - Oil supply device for internal combustion engine

Info

Publication number: CN114514361A
Application number: CN202080067189.XA
Authority: CN
Inventors: 朝仓务; 镰田刚史; 福冈理郎
Original assignee: Isuzu Motors Ltd
Current assignee: Isuzu Motors Ltd
Priority date: 2019-09-30
Filing date: 2020-09-30
Publication date: 2022-05-17
Anticipated expiration: 2040-09-30
Also published as: DE112020004684T5; WO2021066009A1; CN114514361B; JP2021055602A

Abstract

The invention provides an oil supply device of an internal combustion engine, which can stably perform variable operation of an oil pump. An oil supply device for an internal combustion engine is provided with: an oil pump device including a pump unit that discharges oil based on power of an internal combustion engine, and a variable unit that has a control hydraulic chamber and operates to reduce the discharge amount of the pump unit when the hydraulic pressure of oil supplied to the control hydraulic chamber is equal to or greater than a hydraulic pressure threshold value; an electromagnetic valve provided in an oil passage connected to the control oil pressure chamber and allowing oil to be supplied to the control oil pressure chamber when the electromagnetic valve is in an open state by energization; and a control unit that performs variable control for energizing the solenoid valve when the internal combustion engine is in a low load state and the rotational speed of the internal combustion engine is equal to or greater than a rotational speed threshold value, and performs jam suppression control for energizing the solenoid valve when the oil pressure of the oil is less than a hydraulic pressure threshold value.

Description

Oil supply device for internal combustion engine

Technical Field

The present invention relates to an oil supply device for an internal combustion engine.

Background

Conventionally, an oil supply device for an internal combustion engine including an oil pump capable of changing the amount of oil discharged is known. Patent document 1 discloses an oil supply device that is driven by rotation of a crankshaft connected to an internal combustion engine and that supplies oil pressure discharged from a discharge port to components of the internal combustion engine.

The discharge amount of the oil pump disclosed in patent document 1 differs depending on the control pressure. Such a control pressure is regulated by a solenoid valve.

Documents of the prior art

Patent literature

Patent document 1: japanese unexamined patent publication No. 2014-31739

Disclosure of Invention

Problems to be solved by the invention

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

The invention aims to provide an oil supply device of an internal combustion engine, which can stably perform variable operation of an oil pump.

Means for solving the problems

An oil supply device for an internal combustion engine according to an aspect of the present invention includes:

an oil pump device including a pump unit that discharges oil based on power of an internal combustion engine, and a variable unit that has a control hydraulic chamber and operates to reduce the discharge amount of the pump unit when the hydraulic pressure of oil supplied to the control hydraulic chamber is equal to or greater than a hydraulic pressure threshold value;

an electromagnetic valve provided in an oil passage connected to the control oil pressure chamber and allowing oil to be supplied to the control oil pressure chamber when the electromagnetic valve is opened by energization; and

a control unit for performing the following control: variably controlling energization of 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 a jam suppression control for energizing the solenoid valve when the oil pressure is less than the oil pressure threshold value.

An oil supply device for an internal combustion engine according to another aspect of the present invention includes:

an oil pump device that supplies oil to the internal combustion engine;

an oil pressure sensor that measures an oil pressure of the supplied oil;

a valve provided in an oil passage for supplying the oil to the oil pump device, the valve opening and closing the oil passage; and

and a control unit that controls opening and closing of the valve, and performs a jam suppression control for opening the valve again after the valve is closed when the oil pressure is smaller than a threshold value.

Effects of the invention

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

Drawings

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 the variable control of the fueling device implemented by the fueling device of the internal combustion engine according to the embodiment.

Fig. 3 is a flowchart for explaining the jam suppression control of the electromagnetic valve performed by the fuel supply apparatus for an internal combustion engine according to the embodiment.

Fig. 4A is a diagram showing a relationship between the rotation speed of the internal combustion engine and the oil pressure of the oil in the oil supply device of 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 illustrating an example of a relationship between the rotation speed of the internal combustion engine and the oil pressure of the oil supply device according to the embodiment.

Detailed Description

Next, an example of an embodiment of the present invention will be described in detail with reference to the drawings. The fuel supply apparatus for an internal combustion engine according to the embodiment described later is an example of the fuel supply apparatus for an internal combustion engine according to the present invention, and the present invention is not limited to the embodiment described later.

[ embodiment ]

The oil supply device 1 for an internal combustion engine according to the present embodiment will be described with reference to fig. 1 and 2.

Fig. 1 is a schematic diagram for explaining the structure of an oil supply device 1. Hereinafter, with respect to the structure of the oil supply apparatus 1, only the structure necessary for the description of the characteristic parts of the oil supply apparatus 1 will be described. Other structures of the oil supply device 1 may be the same as those of various oil supply devices known in the related art.

< oil supply apparatus >

The oil supply device 1 is applied to an internal combustion engine E, and supplies oil for lubrication or cooling to constituent members (for example, pistons) 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. The configuration of the internal combustion engine E is the same as that of various conventionally known internal combustion engines, and therefore, detailed description thereof is omitted.

The oil supply device 1 includes a variable oil pump device 2, a variable control unit 3, and an oil pan 4. The elements 2 to 4 of the oil supply device 1 are connected by an oil passage L1.

The structure of the oil supply device 1 is not limited to the illustrated structure. Although not shown, the oil supply device 1 may have, for example, a main oil gallery that is a passage for oil discharged from the oil pump device 2, an oil filter for filtering the oil, an oil cooler for cooling the oil, and a supply portion (nozzle or the like) for supplying the oil to the constituent components of the internal combustion 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 member L11 of the oil passage L1. The oil that has flowed into the oil pump device 2 is pressurized by the oil pump device 2, and is discharged from the oil pump device 2 to the oil passage member L12 of the oil passage L1.

The oil discharged from the oil pump device 2 to the oil passage member L12 is pressure-fed to a constituent member (e.g., 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 member L12 branches off from the oil passage member L12 and flows into the oil passage member L13. In a state where the solenoid valve 31 of the variable control portion 3 is closed (hereinafter, simply referred to as a "closed state"), the oil flowing into the oil passage member L13 is blocked by the solenoid valve 31.

On the other hand, in a state where the solenoid valve 31 is open (hereinafter, simply referred to as an "open state"), the oil that has flowed into the oil passage member L13 flows into the oil passage member L14 of the oil passage L1 through the solenoid valve 31. Then, the oil that has flowed into the oil passage member L14 flows into a control oil pressure chamber 221 of the variable portion 22 (described later). The oil pump device 2 operates based on the oil pressure of the oil in the control oil pressure chamber 221, and changes the discharge amount of the oil discharged from the oil pump device 2. Hereinafter, a specific structure 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 rotation of the crankshaft.

The discharge amount of the oil pump device 2 is the capacity of oil discharged from the oil pump device 2 when a drive shaft 212 (described later) of the oil pump device 2 rotates one revolution. The oil pump device 2 of the present embodiment is capable of switching the discharge amount between a first discharge amount and a second discharge amount smaller than the first discharge amount.

The oil pump device 2 includes a pump section 21 and a variable section 22.

< Pump part >

Pump section 21 has a housing 211, a drive shaft 212, a rotor 213, a plurality of impellers 214, and a cam ring 215.

The housing 211 has a cylindrical housing portion 211 a. The housing portion 211a houses the elements 212 to 215 constituting the pump portion 21.

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

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

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

The inlet 211d is an inlet for supplying oil to a control hydraulic chamber 221 (described later). The oil passage member L14 is connected to the inlet 211 d. A first end (upstream end) of the oil passage member L14 is connected to a second port 312 of the solenoid valve 31 (described later). A second end (end on the downstream side) of the oil passage member L14 is connected to the introduction port 211 d.

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 a crankshaft and rotates by 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 cylindrical member having a center hole (not shown). The drive shaft 212 is inserted through the stopping hole of the rotor 213.

The rotor 213 has slits 213a provided at equal intervals in the circumferential direction on the outer circumferential surface. The slits 213a extend in the axial direction of the rotor 213, respectively. Such slits 213a support the impellers 214, respectively.

Each impeller 214 is a plate-like member, and is supported so as to be movable in the radial direction of the rotor 213 with respect to the slit 213a of the rotor 213. That is, each impeller 214 is configured to be able to change the amount of protrusion from the outer circumferential surface of the rotor 213.

The cam ring 215 is a cylindrical 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 so as to be able to be eccentric with respect to the central axis of the rotor 213. The eccentric amount of the cam ring 215 with respect to the rotor 213 varies based on the oil pressure of the oil supplied to the control oil pressure chamber 221.

The cam ring 215 has a plate-like flange portion 215a at a part of the outer peripheral surface. Between the inner peripheral surface of the cam ring 215 and the outer peripheral surface of the rotor 213, a plurality of pump chambers 216 partitioned by the impeller 214 are provided.

The volume of each pump chamber 216 varies 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 section 21 changes.

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

< variable part >

The variable portion 22 changes the discharge amount of the pump portion 21 under the control of a variable control portion 3 (described later). The variable portion 22 has a control oil pressure chamber 221 and a spring 222.

The control oil pressure 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 oil pressure chamber 221 through the oil passage member L14 and the introduction port 211 d.

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

The spring 222 always 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 oil pressure chamber 221 is equal to or greater than the oil pressure threshold value.

When the spring 222 contracts, the eccentric amount of the cam ring 215 with respect to the rotor 213 changes, and the volume of the pump chamber 216 changes. In the present embodiment, when the spring 222 contracts, the volume of the pump chamber 216 decreases. As a result, the discharge amount of the pump section 21 decreases.

The structure of the oil pump device is not limited to the above structure. The oil pump device may be any of various variable oil pump devices known in the related art.

< variable control section >

The variable control unit 3 controls the supply state of oil to the variable portion 22 (specifically, the control oil pressure chamber 221). The variable control unit 3 includes a solenoid valve 31 and a control unit 32.

< solenoid valve >

The solenoid valve 31 is switched between a closed state and an open state under the control of a control unit 32 (described later). In a state where the electromagnetic valve 31 is energized (hereinafter referred to as an "energized state"), the first port 311 and the second port 312 are connected in a state where oil can flow therethrough. 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.

In addition, the solenoid valve 31 disconnects the first port 311 from the second port 312 in a non-energized state (hereinafter, referred to as a "non-energized state"). The non-energized state of the solenoid valve 31 (the state in which the first port 311 is disconnected from the second port 312) corresponds to the closed state of the solenoid valve 31.

The solenoid valve 31 is provided in an oil path 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 member L13 and the oil passage member L14. A first end (an upstream end) of the oil passage member L13 is connected to the oil passage member L12. A second end portion (end portion on the downstream side) of the oil passage member L13 is connected to the first port 311 of the solenoid valve 31.

A first end (an upstream end) of the oil passage member L14 is connected to the second port 312 of the solenoid valve 31. A second end portion (end portion on the downstream side) of the oil passage member L14 is connected to the inlet port 211d of the oil pump device 2.

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

< control section >

The control unit 32 controls the fuel supply device 1 and includes a known CPU, ROM, RAM, input ports, output ports, and the like. The control unit 32 is connected to the solenoid valve 31 via the transmission line 5. The control unit 32 may be a control device that performs various controls of the vehicle, or may be a control device provided exclusively for the fuel supply apparatus 1.

Specifically, the control unit 32 controls the energization state of the solenoid valve 31 to switch the open/close 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 and seizure suppression control relating to oil pump device >

Hereinafter, the variable control and the seizure suppression control of the oil pump device performed by the oil supply device 1 according to the present embodiment will be described with reference to fig. 2 and 3.

Fig. 2 is a flowchart showing variable control of the oil pump (hereinafter, simply referred to as "variable control") performed by the oil supply device 1. Fig. 3 is a flowchart showing the seizure suppression control (hereinafter, simply referred to as "seizure suppression control") performed by the fuel supply apparatus 1. The operations shown in fig. 2 and 3 are performed by the control unit 32.

First, an outline of the variable control of the oil pump device of 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, a 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 driven state of the oil pump device 2, the oil discharged from the oil pump device 2 is pressure-fed to a constituent member (e.g., a piston) of the internal combustion engine E.

In the case where the variable portion 22 is not operated in the driving state of the oil pump device 2, the discharge amount of the oil discharged from the oil pump device 2 is the first discharge amount. In the oil pump device 2, a state in which the variable portion 22 is not operated (that is, a 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, in the case where the variable portion 22 is operated in the driving state of the oil pump device 2, the discharge amount of the oil discharged from the oil pump device 2 is the second discharge amount smaller than the first discharge amount. In the oil pump device 2, a state in which the variable portion 22 is operated (that is, a 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 information on the load of the internal combustion engine E and information on the oil temperature of the oil. The above control performed by the control portion 32 is variable control of the oil supply device. Hereinafter, a specific process of the variable control and the jam suppression control of the oil pump device will be described with reference to fig. 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 relating to the load of the internal combustion engine E may be a detection value of a sensor provided in the vehicle.

The information on the load of the internal combustion engine E may be, for example, information on an injection amount of a fuel injection device (not shown) that injects fuel into a combustion chamber of the internal combustion engine E (hereinafter, referred to as "information on a fuel injection amount"). The information on the load of the internal combustion engine E may be information on the opening degree of a throttle valve of the internal combustion engine E or information on the opening degree of an accelerator, for example.

In step S102, the control portion 32 determines whether the internal combustion engine E is in a low load state based on the acquired information about the load of the internal combustion engine E.

Specifically, when the information on the load of the internal combustion engine E is the information on the fuel injection amount, the control unit 32 determines whether the fuel injection amount is equal to or less than the injection amount threshold value in step S102.

When the fuel injection amount is equal to or less than the injection amount threshold, the control portion 32 determines that the internal combustion engine E is in the low load state. On the other hand, when the fuel injection amount is larger than the injection amount threshold value, the control portion 32 determines that the internal combustion engine E is not in the low load state. The 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 the 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 on the temperature of the oil. The information relating to the temperature of the oil may be a detection value of a sensor provided to the vehicle. That is, the control portion 32 acquires information on the temperature of the oil from the sensor.

The information on the temperature of the oil is not limited to the temperature of the oil, and may be any information on the temperature of the oil. For example, the information relating to the temperature may be the temperature of the cooling water for cooling the engine acquired by a water temperature sensor. The information on 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 the oil is in a low temperature state based on the acquired information about the temperature of the oil.

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

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

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

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

On the other hand, if the oil is not in the 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 to the first rotation speed. In this way, when the internal combustion engine E is in the low load state and the oil is in the low temperature state, the control portion 32 sets the value of the rotation speed threshold value to the first rotation speed.

On the other hand, in step S106, the control unit 32 sets the rotation speed threshold value to the second rotation speed. The second rotational speed is greater than the first rotational speed. Note that the control unit 32 may set the second rotation speed as the rotation speed threshold value in advance at the time of starting the internal combustion engine E.

In this way, the control unit 32 sets the rotation speed threshold value to 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 the oil state corresponds to the second high temperature state before performing step S106. Then, when the state of the oil corresponds to the second high temperature state, the control portion 32 may shift the control process to step S110.

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

In step S107, the control portion 32 acquires information on the rotation speed of the internal combustion engine E (for example, the rotation speed of the crankshaft). The information on 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 portion 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 greater than a 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 (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 section 21 flows into the control oil pressure chamber 221 through the solenoid valve 31 and the introduction port 211 d.

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

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

On the other hand, when the oil pressure of the oil flowing into the control oil pressure chamber 221 is smaller than the oil pressure threshold, the variable portion 22 does not operate. As a result, the volume of the pump chamber 216 does not change, and the discharge amount of the oil discharged from the pump section 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 the oil discharged from the pump section 21 is the first discharge amount.

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

In step S110, the control unit 32 turns off the solenoid valve 31 without energizing the solenoid valve 31. When the electromagnetic valve 31 is already in the closed state in step S110, the control unit 32 maintains the closed state of the electromagnetic valve 31. On the other hand, when the solenoid valve 31 is in the open state in step S110, the control unit 32 stops the energization of the solenoid valve 31 and closes the solenoid valve 31.

In the closed state of the electromagnetic valve 31, the variable portion 22 does not operate because the oil discharged from the pump portion 21 does not flow into the control oil pressure chamber 221. Thus, the discharge amount of the oil discharged from the pump portion 21 is the first discharge amount.

In step S111, the control unit 32 executes jam suppression control for suppressing the jamming of the solenoid valve 31.

First, the reason why the jam suppression control is performed will be described. In the oil supply device 1 of the present embodiment, the conditions under which the oil pump device 2 is variable (hereinafter referred to as "variable conditions of the oil pump device") are: the rotation speed of the internal combustion engine E is equal to or higher than a rotation speed threshold value, and the oil pressure of the oil in the control oil pressure chamber 221 is equal to or higher than a hydraulic pressure threshold value.

In the oil supply device 1, when the rotation speed of the internal combustion engine E is equal to or greater than the rotation speed threshold value, the electromagnetic valve 31 is opened, and oil is supplied to the control oil pressure chamber 221. When the oil pressure of the oil in the control oil pressure chamber 221 is equal to or higher than the oil pressure threshold, the variable portion 22 operates to vary the oil pump device 2.

For example, when the state in which the rotation speed of the internal combustion engine E is lower than the rotation speed threshold value continues for a long time, there is a possibility that the electromagnetic valve 31 may be stuck. If the solenoid valve 31 is stuck, the solenoid valve 31 may not operate normally. In view of this, the fueling device 1 of the present embodiment is configured to suppress the electromagnetic valve 31 from being stuck by energizing the electromagnetic valve 31 in a state where the rotation speed of the internal combustion engine E is lower than the rotation speed threshold value. The jam suppression control will be described below with reference to fig. 3.

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

For example, the oil pressure sensor may be provided in a passage oil passage (specifically, an oil passage member L12 or an oil passage member L13) through which oil supplied to the control oil pressure chamber 221 passes. Alternatively, the oil pressure sensor may be provided in the oil supply device 1 at a portion (for example, a main oil gallery) through which oil of an oil pressure equal to the oil pressure of the oil supplied to the control oil pressure 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, the control unit 32 determines whether the oil pressure of the oil is smaller than the oil pressure threshold in step S1112. As described above, the hydraulic pressure threshold value is the hydraulic pressure required to operate the variable portion 22. Therefore, the low-pressure state of the oil can be understood as a state in which the oil pressure of the oil is lower than the oil pressure required to operate the variable portion 22. The state in which the oil pressure is equal to or higher than the oil pressure threshold value 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 seizure 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 the energization of the solenoid valve 31. Alternatively, the control unit 32 may stop the energization of the solenoid valve 31 after a lapse of a predetermined time, instead of stopping the energization of the solenoid valve 31 after a lapse of a time determined in accordance with the oil pressure of the oil from the start of the energization of the solenoid valve 31. Alternatively, the control unit 32 may stop the energization of the solenoid valve 31 when the oil pressure of the oil after the energization of the solenoid valve 31 is started exceeds the oil pressure threshold, instead of stopping the energization of the solenoid valve 31 after a predetermined time has elapsed.

In this way, the control unit 32 energizes the solenoid valve 31 in a low pressure state of the oil, and opens the solenoid valve 31. In step S1113, even if the solenoid valve 31 is opened, the oil pump device 2 is not in a variable state because the oil is in a low-pressure state.

< modification 1>

A modified example 1 of the jam suppression control will be described. The control portion 32 can acquire the elapsed time (integrated time) from the last energization of the solenoid valve 31. Then, the control unit 32 may perform the jam suppression control when the acquired elapsed time (integrated time) is equal to or greater than the time threshold. Such an elapsed time (integrated time) may be an integration of the time during which the electromagnetic valve 31 is not energized in the on state of the internal combustion engine E and the time during which the electromagnetic valve 31 is not energized in the off state of the internal combustion engine E.

For example, the control unit 32 may determine whether or not the acquired integrated time is equal to or greater than a time threshold between step S110 and step S111 in fig. 2. Then, when the acquired integrated time is equal to or greater than the time threshold, the control unit 32 may skip the jam suppressing process of step S111.

Alternatively, the control unit 32 may determine whether or not the acquired integrated time is equal to or greater than the time threshold between step S1112 and step S1113 in fig. 3. Then, when the acquired integrated time is equal to or greater than the time threshold, the control unit 32 may skip the control process of step S1113.

In this way, in the jam suppression control of modification 1, the timing at which the solenoid valve 31 is opened is determined based on the cumulative time during which the solenoid valve 31 is not energized. Therefore, the process of bringing the solenoid valve 31 into the open state in the jam suppression control is not unnecessarily repeated.

< modification 2>

Next, a modified example 2 of the jam suppression control will be described. When the oil state does not correspond to the second high temperature state, the control unit 32 may perform the seizure suppression control. In other words, when the state of the oil corresponds to the second high temperature state, the control unit 32 may not perform the seizure suppression control.

For example, the control unit 32 may determine whether the oil state corresponds to the second high temperature state between step S110 and step S111 in fig. 2. Specifically, the control unit 32 determines whether the temperature of the oil is higher than the second temperature threshold.

Alternatively, the control unit 32 may determine whether the oil state corresponds to the second high temperature state between step S1112 and step S1113 in fig. 3. Then, in the case where the state of the oil corresponds to the second high temperature state, the control portion 32 may skip the control process of 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 seizure suppression control. As a result, even if the oil pressure of the oil rises, the variable portion 22 operates, and the discharge amount of the oil pump device 2 does not decrease. Therefore, the components of the internal combustion engine E can be efficiently cooled in the second high temperature state of the oil.

In the fueling device of the present embodiment, the electromagnetic valve 31 may be opened in a high-load state of the internal combustion engine E. Specifically, in the electromagnetic valve seizure suppression control, when the oil is in a low-pressure state, the electromagnetic 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.

In the variable control of the fueling device of the present embodiment, the electromagnetic valve 31 may be opened when the internal combustion engine E is in a low load state and the rotation speed of the internal combustion engine E is greater than a rotation speed threshold value (first rotation speed or second rotation speed).

Specifically, in the seizure suppression control, when the oil is in a low pressure state, the solenoid valve 31 is in an open state even when the engine E is in a low load state and the rotation speed of the engine E is less than a rotation speed threshold (first rotation speed or second rotation speed). 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 the low load state and the rotation speed of the internal combustion engine E is smaller than the rotation speed threshold (the first rotation speed or the second rotation speed), the oil pump device 2 is not brought into the variable state.

< actions and effects of the present embodiment >

As described above, in the fueling device 1 of the present embodiment, the jamming of the solenoid valve can be suppressed by performing the jamming 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.

In the fueling device 1 of 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 for the internal combustion engine E is small, and 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 of the internal combustion engine is improved.

In addition, 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 caused by the operation of the variable portion 22 can be reduced.

The reason will be described with reference to fig. 4A to 4D. Fig. 4A is a diagram showing a relationship between the rotation speed of the internal combustion engine E and the oil pressure of the oil discharged from the pump section 21 when the variable portion is operated in the low load state of the internal combustion engine E and in the low temperature state of the oil with respect to the oil feeding device of the reference example. The oil supply device of the reference example is understood to be an oil supply device that does not implement the variable control of the oil pump device of the present embodiment.

Fig. 4B to 4D are graphs showing the relationship between the rotation speed of the internal combustion engine E and the hydraulic pressure of the oil discharged from the pump section 21 in the fueling device 1 according to the present embodiment.

Specifically, fig. 4B is a diagram showing the relationship between the rotation speed of the internal combustion engine E and the oil pressure of the oil discharged from the pump section 21 when the variable portion 22 is operated in a low load state of the internal combustion engine E where the amount of oil required for the internal combustion engine E is small and in a low temperature state of the oil.

Fig. 4C is a diagram showing the relationship between the rotation speed of the internal combustion engine E and the oil pressure of the oil discharged from the pump section 21 when the variable portion 22 is not operated in the non-low temperature state of the oil in the high load state of the internal combustion engine E in which the amount of oil required for the internal combustion engine E is large.

Fig. 4D is a diagram showing the relationship between the rotation speed of the internal combustion engine E and the oil pressure of the oil discharged from the pump section 21 when the variable portion 22 is operated in the low load state of the internal combustion engine E in which the amount of oil required for the internal combustion engine E is large and in the non-low temperature state of the oil.

Here, in both the fueling device 1 of the present embodiment and the fueling device of the reference example, the variable portion 22 operates when the oil pressure in the control oil pressure chamber 221 becomes equal to or higher than P1.

The oil pressure in the control oil pressure chamber 221 is equal to the oil pressure of the oil discharged from the pump section 21. In the fuel supply apparatus of the reference example, the rotation speed threshold 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 fueling device 1 of the present embodiment, the rotation speed threshold at which the solenoid valve 31 is opened in the low load state of the internal combustion engine E and in the oil low temperature state is the second rotation speed (that is, the rotation speed N2).

In the fueling device 1 of the present embodiment, the rotational speed threshold value at which the solenoid valve 31 is opened in the low load state of the internal combustion engine E and in the non-low temperature state of the oil is the first rotational speed (that is, the rotational speed N1).

Since the viscosity of the oil in the low temperature state is higher than that of the oil in the high temperature state, the hydraulic pressure in the low temperature state (see fig. 4A) increases at a higher rate than the hydraulic pressure in the high temperature state (see fig. 4D).

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

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

On the other hand, in the fueling device 1 of the present embodiment, when the internal combustion engine E is in a low load state and the oil is in a low temperature state, as shown in fig. 4B, the oil pressure of the oil in the control oil pressure chamber 221 becomes P1 at the rotation speed N2, and the electromagnetic valve 31 is opened. As a result, the variable portion 22 operates at the rotation speed N2. As shown in fig. 4B, even if the discharge amount of the pump section 21 is reduced, the oil pressure of the oil does not greatly vary from P1. Therefore, the occurrence of torque shock of the internal combustion engine E due to fluctuations in the oil pressure of the oil can be suppressed.

In the fueling device 1 of the present embodiment, when the internal combustion engine E is in the low load state and the oil is in the high temperature state, as shown in fig. 4, the oil pressure of the oil in the control oil pressure chamber 221 becomes P1 at the rotation speed N1, and the electromagnetic valve 31 is opened. As a result, the variable portion 22 operates at the rotation speed N1. As shown in fig. 4C, even if the discharge amount of the pump section 21 is reduced, the oil pressure of the oil does not greatly vary from P1. Therefore, the occurrence of torque shock of the internal combustion engine E due to fluctuations in the oil pressure of the oil can be suppressed.

The present application is based on the japanese patent application (japanese application 2019-178981) filed on 30/9/2019, the content of which is hereby incorporated by reference.

Industrial applicability

The oil supply device of the present invention can be applied to various internal combustion engines such as gasoline engines, but is not limited to diesel engines.

Description of the reference numerals

1 oil supply device

2 oil pump device

21 pump part

211 casing

211a accommodating part

211b suction inlet

211c discharge port

211d introducing port

212 drive shaft

213 rotor

213a slit

214 impeller

215 cam ring

215a flange portion

216 pump chamber

22 variable part

221 control oil pressure chamber

222 spring

3 variable control part

31 solenoid valve

311 first port

312 second port

32 control part

4 oil pan

5 Transmission line

L1 oil way

L11, L12, L13, L14 oil path component

E internal combustion engine

Claims

1. An oil supply device for an internal combustion engine, comprising:

an oil pump device that supplies oil to the internal combustion engine;

an oil pressure sensor that measures an oil pressure of the supplied oil;

2. The oil supply apparatus of an internal combustion engine according to claim 1,

the control portion closes the valve when the internal combustion engine is in a high load state or a rotation speed of the internal combustion engine is smaller than a threshold value.

3. The oil supply apparatus of an internal combustion engine according to claim 2,

the control unit executes the seizure suppression control when the oil pressure is smaller than the threshold value and the rotation speed of the internal combustion engine is smaller than the threshold value.

4. The oil supply apparatus of an internal combustion engine according to claim 2,

the control unit executes the seizure suppression control when the oil pressure is smaller than the threshold value and the internal combustion engine is in a high-load state.

5. The oil supply apparatus of an internal combustion engine according to claim 2,

the control unit executes the seizure suppression control when the oil pressure is smaller than the threshold value and an elapsed time from a last opening of the valve is equal to or longer than the threshold value.

6. The oil supply apparatus of an internal combustion engine according to claim 2,

the control unit performs the seizure suppression control when the oil pressure is lower than the threshold value and the oil temperature is lower than the threshold value.