JP6932945B2 - Relief valve control device and relief valve control method - Google Patents

Description

The present invention relates to a relief valve control device and a relief valve control method.

Conventionally, there is known a relief valve that releases oil when the oil pressure (lubricating oil) pumped by an oil pump and supplied to an internal combustion engine exceeds a predetermined value (see, for example, Patent Document 1).

In such a relief valve, for example, a flow path through which the valve body slides (hereinafter referred to as a main flow path) and a relief flow path are formed inside the valve body. The valve body closes the relief flow path when the oil pressure is less than the predetermined value, and slides on the main flow path when the oil pressure exceeds the predetermined value. As a result, the relief flow path is opened, and the oil is discharged from the relief flow path to, for example, an oil pan.

Japanese Unexamined Patent Publication No. 2012-17798

However, in a low temperature start (also called a cold start) in which the internal combustion engine is started at a temperature lower than the outside air temperature, the viscosity of the oil flowing into the relief valve becomes high. Therefore, in the main flow path, the pressure on the upstream side of the valve body becomes higher than the pressure on the downstream side of the valve body, so that the valve body slides, the relief flow path is opened, and the oil flows out. As a result, the supply of oil to the internal combustion engine is delayed, and the internal combustion engine is damaged (for example, seizure of sliding portions).

An object of the present invention is to provide a relief valve control device and a relief valve control method capable of promptly supplying a fluid to a supply destination at the time of low temperature starting.

The relief valve control device of the present invention is a relief valve control device that controls a relief valve in which the relief flow path is opened or closed by the valve body moving in the flow path, and the relief valve is operated by energization of a solenoid. By moving in the first direction, the opening connecting the flow path and the outside of the relief valve is opened, and when the solenoid is not energized, it moves in the second direction opposite to the first direction. The relief valve control device has an opening / closing member that closes the opening, and the relief valve control device has an energization control unit that gives an instruction to energize the solenoid and the energization control unit when the internal combustion engine starts at a low temperature. On the other hand, the energization control unit includes an air discharge instruction unit that opens the opening and instructs the execution of an air discharge operation that discharges the air in the flow path to the outside of the relief valve. When instructed to execute the air release operation, the solenoid is instructed to execute energization for a predetermined time.

The relief valve control method of the present invention is a relief valve control method for controlling a relief valve in which the relief flow path is opened or closed by the valve body moving in the flow path, and the relief valve is operated by energization of a solenoid. By moving in the first direction, the opening connecting the flow path and the outside of the relief valve is opened, and when the solenoid is not energized, it moves in the second direction opposite to the first direction. It has an opening / closing member that closes the opening, and when the solenoid engine starts at a low temperature, the opening is opened to release the air in the flow path to the outside of the relief valve. It determines the execution of the operation and instructs the solenoid to execute energization for a predetermined time.

According to the present invention, the fluid can be quickly supplied to the supply destination at the time of low temperature starting.

Sectional drawing which shows the inside of the relief valve which concerns on embodiment of this invention Sectional drawing which shows the inside of the relief valve which concerns on embodiment of this invention Functional block diagram showing a configuration example of an ECU according to an embodiment of the present invention A flowchart showing an operation example of the ECU according to the embodiment of the present invention. Sectional drawing which shows an example of the relief valve which concerns on the modification of this invention

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

First, a configuration example of the relief valve 1 according to the embodiment of the present invention will be described with reference to FIG.

FIG. 1 is a cross-sectional view showing the inside of the relief valve 1 according to the present embodiment. FIG. 1 shows a case where the relief flow path 6 is in a closed state. The double-headed arrow shown in FIG. 1 indicates the longitudinal direction of the relief valve 1. In the following description, the direction indicated by the arrow L is the "left direction" (an example of the first direction), and the direction indicated by the arrow R is the "right direction". It is called "direction" (an example of the second direction). Further, the longitudinal direction of the relief valve 1 is appropriately referred to as a "left-right direction".

In the present embodiment, the case where the fluid flowing through the relief valve 1 is oil will be described as an example, but the present invention is not limited to this, and a liquid other than oil may be used.

The relief valve 1 is provided in, for example, an oil pan or a crankcase (both are not shown; the same applies hereinafter), but the relief valve 1 is not limited thereto.

Inside the housing 2 of the relief valve 1, a flow path 3 (an example of a second flow path) is formed along the longitudinal direction of the relief valve 1, and the flow path 4 is orthogonal to the flow path 3. A flow path 5 and a relief flow path 6 are formed. The relief flow path 6 is formed so as to penetrate the housing 2. These flow paths have, for example, a cylindrical shape (also referred to as a cylindrical shape). The flow of oil in each flow path will be described later.

In the flow path 3, a cylindrical valve body 7 (an example of a second valve body) is provided on the downstream side (left side in the drawing) of the flow path 5.

A spring 8 is attached to the valve body 7, and the valve body 7 slides (moves) in the flow path 3 in the left-right direction according to the expansion and contraction of the spring 8. The range in which the valve body 7 slides is between the stopper 9 and the stopper 10. The stopper 9 is a portion that restricts the movement of the valve body 7 to the right, and the stopper 10 is a portion that restricts the movement of the valve body 7 to the left.

Further, the valve body 7 is formed with an internal space 7a having an opening at one end (left end in the drawing). Further, a through hole 11 is formed at the other end (right end in the drawing) of the valve body 7 along the longitudinal direction of the relief valve 1. The through hole 11 communicates with the internal space 7a. The internal space 7a and the through hole 11 function as an oil flow path.

Further, the relief valve 1 is formed with a through hole 12, a flow path 13 (an example of a first flow path), and a flow path 14. These are, for example, cylindrical.

The flow path 13 is formed along the longitudinal direction of the relief valve 1 and communicates with the flow path 3 through the through hole 12.

Further, the flow path 13 communicates with the flow path 4 connected to the outside of the relief valve 1.

The flow path 13 is provided with a spherical valve body 15 and a substantially cylindrical valve body 16 (both are examples of the first valve body).

The valve body 16 slides (moves) in the flow path 13 in the left-right direction.

The movement of the valve body 16 to the left is realized by energizing the solenoid 18. In other words, the solenoid 18 moves the valve body 16 to the left by energization. The energization of the solenoid 18 is executed based on an instruction (control signal described later) from an ECU (Electric Control Unit; not shown in FIG. 1). The ECU will be described later with reference to FIG.

On the other hand, the movement of the valve body 16 to the right is realized by the urging force of the spring 17 attached to the valve body 16. In other words, when the solenoid 18 is in the non-energized state, the spring 17 extends to the right to move the valve body 16 to the right.

When the valve body 16 moves to the right, the spherical valve body 15 closes the through hole 12 by being pressed by the valve body 16 as shown in FIG. On the other hand, when the valve body 16 moves to the left, the spherical valve body 15 opens the through hole 12 by moving to the left (see FIG. 2 described later).

The configuration example of the relief valve 1 according to the present embodiment has been described above.

Next, the flow of oil in the relief valve 1 will be described. Hereinafter, the oil flow in each case will be described separately for the case where the solenoid 18 is in the non-energized state and the case where the solenoid 18 is in the energized state.

First, the flow of oil when the solenoid 18 is in the non-energized state will be described with reference to FIG.

When the solenoid 18 is in the non-energized state, as shown in FIG. 1, the valve body 16 urged by the spring 17 and moved to the right presses the spherical valve body 15. As a result, the through hole 12 is closed.

In that state, the oil pumped from the oil pan by the oil pump (not shown) flows into the flow path 4 through a predetermined flow path (not shown) and flows to the left in the flow path 3.

Most of the oil flowing through the flow path 3 flows out from the flow path 5 to the outside of the relief valve 1, and passes through a predetermined flow path (not shown) connected to the flow path 5 to provide an internal combustion engine (not shown below). (Same as above).

On the other hand, a part of the oil flowing through the flow path 3 flows into the internal space 7a from the through hole 11 of the valve body 7. Since the through hole 12 is blocked, this oil does not flow into the flow path 13, but enters the internal space 7a, the flow path 3 to the left of it, and the through hole 12 (hereinafter referred to as the internal space 7a, etc.). It is stored.

The oil pressure in the internal space 7a and the like is equal to the oil pressure on the upstream side of the valve body 7. At this time, as shown in FIG. 1, the valve body 7 urged by the spring 8 and moved to the right comes into contact with the stopper 9. As a result, the relief flow path 6 is blocked.

Next, the flow of oil when the solenoid 18 is energized will be described with reference to FIG.

FIG. 2 is a cross-sectional view showing the inside of the relief valve 1 according to the present embodiment, as in FIG. FIG. 2 shows a case where the relief flow path 6 is in an open state.

When the solenoid 18 is energized, as shown in FIG. 2, the valve body 16 moves to the left in the flow path 13 due to the energization, and the spherical valve body 15 released from the pressure by the valve body 16 also moves to the left. Moving. As a result, the through hole 12 is opened.

The oil stored in the internal space 7a or the like flows into the flow path 13 from the through hole 12 and flows out from the flow path 14 to the outside of the relief valve 1. The spilled oil is returned to, for example, an oil pan via a predetermined flow path (not shown).

When the oil stored in the internal space 7a or the like flows out to the outside of the relief valve 1 through the through hole 12, the flow path 13, and the flow path 14, the oil pressure in the internal space 7a or the like is transferred to the valve body 7. It becomes lower than the oil pressure on the upstream side. Therefore, as shown in FIG. 2, the valve body 7 moves to the left in the flow path 3 and comes into contact with the stopper 10. As a result, the relief flow path 6 is opened.

In that state, after flowing into the flow path 4 as in FIG. 1, a part of the oil flowing to the left in the flow path 3 flows out from the flow path 5, and the rest flows out from the relief flow path 6. The oil that has flowed out of the relief valve 1 from the relief flow path 6 is returned to, for example, an oil pan.

The flow of oil in the relief valve 1 has been described above.

Next, a configuration example of the ECU 20 (an example of the relief valve control device) according to the present embodiment will be described with reference to FIG. FIG. 3 is a functional block diagram showing a configuration example of the ECU 20.

Although not shown, the ECU 20 shown in FIG. 3 includes, for example, a CPU (Central Processing Unit), a storage medium such as a ROM (Read Only Memory) storing a control program, and a working memory such as a RAM (Random Access Memory). And has a communication circuit and so on. The functions of each part of FIG. 3 described below are realized by the CPU executing the control program.

As shown in FIG. 3, the ECU 20 has an energization control unit 21 and an air release instruction unit 22.

When, for example, the oil pressure detected by the oil pressure sensor (not shown, the same applies hereinafter) (for example, the oil pressure of the oil supplied from the relief valve 1 to the internal combustion engine) exceeds a predetermined value, the energization control unit 21 sends the solenoid 18 to the solenoid 18. On the other hand, a control signal (hereinafter referred to as an energization instruction signal) instructing the execution of energization is output. The energization instruction signal also includes an instruction of a time for executing energization (hereinafter, referred to as energization time). Upon receiving the energization instruction signal, the solenoid 18 executes energization during the instructed energization time.

Further, when the energization control unit 21 receives an instruction from the air release instruction unit 22, which will be described later, to execute an air discharge operation (details will be described later) for discharging air such as the internal space 7a to the outside of the relief valve 1, the solenoid is used. A control signal (hereinafter referred to as an air release instruction signal) instructing execution of energization is output to 18. The air release instruction signal also includes an instruction of the energization time. Upon receiving the air release instruction signal, the solenoid 18 executes energization during the instructed energization time.

The energizing time indicated by the air release instruction signal (hereinafter, referred to as the energizing time at the time of air release) is, for example, the time required for the oil flowing in from the through hole 11 to fill the internal space 7a and the like shown in FIG. The energization time at the time of air release is set based on the result of an experiment or simulation carried out in advance. The energization time at the time of air release is, for example, the time required for the internal space 7a or the like to be filled with the oil flowing in from the through hole 11.

In the air release indicator 22, for example, is the oil temperature detected by the oil temperature sensor (not shown) (for example, the oil temperature of the oil supplied from the relief valve 1 to the internal combustion engine) equal to or lower than a preset threshold value? Judge whether or not.

Then, when the oil temperature is equal to or lower than the threshold value, the air release instruction unit 22 determines that the start is at a low temperature, and instructs the energization control unit 21 to execute the air release operation. That is, the air discharge operation is performed when the internal combustion engine is started at a low temperature.

The configuration example of the ECU 20 according to the present embodiment has been described above.

Next, an example of the air discharge operation according to the present embodiment will be described.

For example, it is assumed that the relief valve 1 is in a state where the relief flow path 6 is blocked by the valve body 7 and gas (for example, air) is mixed in the internal space 7a or the like as shown in FIG. ..

In this state, when the solenoid 18 receives the air release instruction signal from the energization control unit 21, the solenoid 18 executes energization during the air discharge energization time based on the signal. As a result, the valve body 16 and the spherical valve body 15 move to the left, and the through hole 12 (an example of the opening) is opened (see FIG. 2).

The air in the internal space 7a or the like flows into the flow path 13 from the open through hole 12 and is discharged to the outside of the relief valve 1 through the flow path 14. As a result, the oil from the upstream side of the valve body 7 easily flows into the internal space 7a or the like from the through hole 11.

When the energization is completed, the valve body 16 and the spherical valve body 15 move to the right and the through hole 12 is closed, and the valve body 7 moves to the right and the relief flow path 6 is closed (FIG. 1). reference). At this time, the internal space 7a and the like are filled with oil, and the oil pressure of the internal space 7a and the like becomes equal to the oil pressure on the upstream side of the valve body 7. Then, the oil that has flowed into the relief valve 1 is supplied to the internal combustion engine via the flow path 5 without being discharged from the relief flow path 6.

As described above, during the air discharge operation, the valve body 16 and the spherical valve body 15 function as opening / closing members for opening / closing the through hole 12.

The example of the air discharge operation according to the present embodiment has been described above.

Next, an operation example of the ECU 20 (an example of the relief valve control method) according to the present embodiment will be described with reference to FIG. FIG. 4 is a flowchart showing an operation example of the ECU 20.

First, the air release instruction unit 22 determines whether or not the oil temperature detected by the oil temperature sensor is, for example, equal to or lower than a preset threshold value (step S101).

As a result of the determination in step S101, if the oil temperature is not equal to or less than the threshold value (step S101: NO), the process ends.

On the other hand, as a result of the determination in step S101, when the oil temperature is equal to or lower than the threshold value (step S101: YES), it is determined that the start is at a low temperature, and the process proceeds to step S102.

Next, the air release instruction unit 22 determines the execution of the air release operation, and instructs the energization control unit 21 to execute the air release operation (step S102).

Next, the energization control unit 21 outputs an air discharge instruction signal instructing the solenoid 18 to execute during the air discharge energization time (step S103).

Based on the air release instruction signal, the solenoid 18 executes energization during the instructed air release energization time. As a result, the above-mentioned air discharge operation is executed.

The operation example of the ECU 20 according to the present embodiment has been described above.

As described in detail so far, according to the present embodiment, when starting at a low temperature, the valve body 16 and the spherical valve body 15 are moved to the left by energization, and the through hole 12 is opened to open the internal space. It is characterized in that air such as 7a is discharged to the outside of the relief valve 1.

Due to this feature, the oil easily flows into the internal space 7a or the like, the internal space 7a or the like is immediately filled with the oil, and the valve body 7 moves to the right to block the relief flow path 6. Therefore, since the oil that has flowed into the relief valve 1 does not flow out from the relief flow path 6, the oil can be quickly supplied to the internal combustion engine (an example of the supply destination). As a result, damage to the internal combustion engine (for example, seizure of the sliding portion) can be prevented.

Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and can be appropriately modified and implemented without departing from the spirit of the present invention. It is possible. Hereinafter, a modified example will be described.

[Modification 1]
In the above embodiment, the case where the spherical valve body 15 is provided has been described as an example, but the valve body 16 itself may be configured to close / open the through hole 12 without providing the spherical valve body 15.

[Modification 2]
In the above embodiment, the case where the valve body 16 moves to the left by energization of the solenoid 18 has been described as an example, but the present invention is not limited to this. For example, the valve body 7 may be configured to move to the left when the solenoid 18 is energized. For example, in that configuration, the through hole 12 can be closed when the valve body 7 moves to the right and closes the relief flow path 6, and the valve body 7 moves to the left by energization to close the relief flow. A means for opening the through hole 12 when the road 6 is opened is provided. Further, this means may function as an opening / closing portion for opening / closing an opening for releasing air such as the internal space 7a.

[Modification 3]
In the above embodiment, for example, the energization control unit 21 may output an air release instruction signal to the solenoid 18 a plurality of times at predetermined time intervals. In this case, the energizing time indicated by the air release instruction signal may be set to a value shorter than the above-mentioned energizing time at the time of air release (for example, the time required for the internal space 7a or the like to be filled with oil).

Then, the energization control unit 21 stops the output of the air release instruction signal when, for example, the oil pressure detected by the oil pressure sensor (for example, the oil pressure of the oil supplied from the relief valve 1 to the internal combustion engine) reaches a predetermined value. You may.

Alternatively, the energization control unit 21 may stop the output of the air release instruction signal when, for example, the total value of the energization times indicated by the plurality of outputs reaches the energization time at the time of air release.

[Modification example 4]
In the above embodiment, the case where the relief valve controlled by the ECU 20 is the relief valve 1 shown in FIGS. 1 and 2 has been described as an example, but the present invention is not limited to this. For example, the relief valve (also referred to as a bypass valve) 100 shown in FIG. 5 may be used.

Hereinafter, the relief valve 100 shown in FIG. 5 will be described. FIG. 5 is a cross-sectional view showing a configuration example of the relief valve 100. FIG. 5 shows a case where the relief flow path 6 is in an open state. In FIG. 5, the same components as those in FIGS. 1 and 2 are designated by the same reference numerals, and the description thereof will be omitted below.

The double-headed arrow shown in FIG. 5 indicates the longitudinal direction of the relief valve 100. In the following description, the direction indicated by the arrow U is "upward" (an example of the second direction), and the direction indicated by the arrow D is "downward". It is called "direction" (an example of the first direction).

In the relief valve 100, a main flow path, a relief flow path, and a bypass communication flow path (all not shown; the same applies hereinafter) are formed inside the valve body 7. The relief flow path and the bypass communication flow path communicate with the main flow path, respectively. Further, the main flow path communicates with the space 32.

The relief opening 30 is an opening (outlet) of the relief flow path, and is connected to a flow path (not shown) outside the relief valve 100.

The bypass opening 31 is an opening (outlet) of the bypass communication flow path, and is connected to an external bypass flow path (not shown) of the relief valve 100.

In such a configuration, the oil flows into the main flow path from the inflow port (not shown) provided at the lower end of the relief valve 100, and is relieved from the open side of the relief opening 30 and the bypass opening 31. It flows out to the outside of the valve 100.

When the solenoid 18 is not energized, as shown in FIG. 5, the valve body 16 moves upward, and the valve body 7 is urged by the spring 8 and moves upward. In this case, the bypass opening 31 is closed and the relief opening 30 is opened. Therefore, the oil that has flowed into the relief valve 100 is delivered from the relief opening 30 to the outside of the relief valve 100 (for example, an oil pan).

On the other hand, when the solenoid 18 is energized, the valve body 16 moves downward due to the energization. As a result, the upper portion of the valve body 7 is pressed by the columnar push rod 33 provided at the lower end of the valve body 16, and the valve body 7 moves downward. In this case, the relief opening 30 is closed and the bypass opening 31 is opened. Therefore, the oil that has flowed into the relief valve 100 is sent out from the bypass opening 31 to the outside (bypass flow path) of the relief valve 100.

Hereinafter, an example of the air release operation according to this modification will be described.

For example, in the relief valve 100, the valve bodies 7 and 16 are moving upward, the relief opening 30 is open (see FIG. 5), and there is no oil in the space 32 (space 32). Is filled with air).

In this state, when the solenoid 18 receives the air release instruction signal from the energization control unit 21, the solenoid 18 executes energization during the air discharge energization time based on the signal. As a result, the valve body 16 and the push rod 33 move downward, and the valve body 7 moves downward. As a result, the relief opening 30 is closed and the bypass opening 31 is opened.

The air in the space 32 is discharged to the outside (bypass flow path) of the relief valve 100 from the opened bypass opening 31 via the main flow path. After that, the space 32 is filled with the inflowing oil.

Then, the oil that has flowed into the relief valve 100 is sent out from the bypass opening 31 to the bypass flow path without being discharged from the relief opening 30.

As described above, during the air discharge operation, the bypass opening 31 functions as an opening for releasing air in the space 32, and the valve body 7 (which may include the valve body 16 and the push rod 33) bypasses. It functions as an opening / closing member that opens / closes the opening 31.

The example of the air discharge operation according to this modification has been described above.

<Summary of this disclosure>
The relief valve control device of the present invention is a relief valve control device that controls a relief valve in which the relief flow path is opened or closed by the valve body moving in the flow path, and the relief valve is operated by energization of a solenoid. By moving in the first direction, the opening connecting the flow path and the outside of the relief valve is opened, and when the solenoid is not energized, it moves in the second direction opposite to the first direction. The relief valve control device has an opening / closing member that closes the opening, and the relief valve control device has an energization control unit that gives an instruction to energize the solenoid and the energization control unit when the internal combustion engine starts at a low temperature. On the other hand, the energization control unit includes an air discharge instruction unit that opens the opening and instructs the execution of an air discharge operation that discharges the air in the flow path to the outside of the relief valve. When instructed to execute the air release operation, the solenoid is instructed to execute energization for a predetermined time.

In the relief valve control device, the energization control unit may issue the energization execution instruction a plurality of times.

Further, in the relief valve control device, the energization control unit may stop the energization execution instruction when the pressure of the fluid supplied from the relief valve to the internal combustion engine reaches a predetermined value.

Further, in the relief valve control device, the relief valve is the opening / closing member of the first valve body that moves the first flow path in the first direction by energization of the solenoid, and the first flow path. It has a second valve body that moves within a predetermined range of the second flow path provided on the upstream side, and the relief flow path communicates with the second flow path within the predetermined range, and the first. The first flow path and the second flow path communicate with each other through the first through hole which is the opening, and the fluid from the upstream side of the second valve body is applied to the second valve body. When a second through hole is formed so as to flow to the downstream side of the two valve bodies and the solenoid is not energized, the first valve body moves in the second direction and the first penetration. When the hole is closed, the second valve body moves in the second direction to close the relief flow path, and the solenoid is energized, the first valve body moves in the first direction. The first through hole may be opened, and the second valve body may move in the first direction to open the relief flow path.

Further, in the relief valve control device, the opening / closing member of the relief valve is the valve body, the opening is an opening connecting the flow path and the bypass flow path, and the solenoid is energized. If not, the valve body moves in the second direction to close the opening and opens the relief flow path, and when the solenoid is energized, the valve body moves in the first direction. The opening may be opened and the relief flow path may be blocked.

The relief valve control method of the present invention is a relief valve control method for controlling a relief valve in which the relief flow path is opened or closed by the valve body moving in the flow path, and the relief valve is operated by energization of a solenoid. By moving in the first direction, the opening connecting the flow path and the outside of the relief valve is opened, and when the solenoid is not energized, it moves in the second direction opposite to the first direction. It has an opening / closing member that closes the opening, and when the solenoid engine starts at a low temperature, the opening is opened to release the air in the flow path to the outside of the relief valve. It determines the execution of the operation and instructs the solenoid to execute energization for a predetermined time.

The present invention can be applied to a relief valve control device and a relief valve control method for controlling a relief valve capable of allowing fluid to escape at high pressure.

1,100 Relief valve 2 Housing 3, 4, 5, 13, 14 Flow path 6 Relief flow path 7, 16 Valve body 7a Internal space 8, 17 Spring 9, 10 Stopper 11, 12 Through hole 15 Spherical valve body 18 Solenoid 20 ECU (an example of relief valve control device)
21 Energization control unit 22 Air release indicator 30 Relief opening 31 Bypass opening 32 Space 33 Push rod

Claims (6)

A relief valve control device that controls a relief valve that opens or closes the relief flow path when the valve body moves through the flow path.
The relief valve is
By moving in the first direction by energizing the solenoid, the opening connecting the flow path and the outside of the relief valve is opened, and when the solenoid is not energized, the second direction opposite to the first direction. Has an opening / closing member that closes the opening by moving to
The relief valve control device is
An energization control unit that gives an energization instruction to the solenoid and
When the internal combustion engine starts at a low temperature, the air discharge instructing the energization control unit to execute an air discharge operation for opening the opening and discharging the air in the flow path to the outside of the relief valve. With an indicator,
The energization control unit
Upon receiving an instruction to execute the air release operation, the solenoid is instructed to execute energization for a predetermined time.
Relief valve control device. The energization control unit
The execution instruction of energization is given a plurality of times.
The relief valve control device according to claim 1. The energization control unit
When the pressure of the fluid supplied from the relief valve to the internal combustion engine reaches a predetermined value, the execution instruction of the energization is stopped.
The relief valve control device according to claim 2. The relief valve is
A first valve body which is the opening / closing member and moves in the first direction in the first flow path by energization of the solenoid.
It has a second valve body that moves within a predetermined range of the second flow path provided on the upstream side of the first flow path.
The relief flow path communicates with the second flow path within the predetermined range.
The first flow path and the second flow path communicate with each other through the first through hole which is the opening.
The second valve body is formed with a second through hole through which a fluid from the upstream side of the second valve body can flow to the downstream side of the second valve body.
When the solenoid is not energized, the first valve body moves in the second direction to close the first through hole, and the second valve body moves in the second direction to relieve the relief. Block the flow path,
When the solenoid is energized, the first valve body moves in the first direction to open the first through hole, and the second valve body moves in the first direction to open the relief flow path. To open,
The relief valve control device according to any one of claims 1 to 3. The relief valve is
The opening / closing member is the valve body.
The opening is an opening that connects the flow path and the bypass flow path.
When the solenoid is not energized, the valve body moves in the second direction to close the opening and open the relief flow path.
When the solenoid is energized, the valve body moves in the first direction to open the opening and close the relief flow path.
The relief valve control device according to any one of claims 1 to 3. It is a relief valve control method that controls a relief valve in which the relief flow path is opened or closed when the valve body moves in the flow path.
The relief valve is
By moving in the first direction by energizing the solenoid, the opening connecting the flow path and the outside of the relief valve is opened, and when the solenoid is not energized, the second direction opposite to the first direction. It has an opening / closing member that closes the opening by moving to.
When the internal combustion engine starts at a low temperature, it is determined to execute an air discharge operation for opening the opening and releasing the air in the flow path to the outside of the relief valve, and the solenoid is subjected to a predetermined time. Instruct to perform energization for a while,
Relief valve control method.

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