JP2021008830A - Engine oil supply device - Google Patents

Abstract

To provide an engine oil supply device for improving the fuel economy of an engine while securing the supply performance of engine oil.SOLUTION: In an engine oil supply device 1 having an oil pump 12 driven by an engine 2 which is mounted to a vehicle, a release path 25 for connecting a suction path side and a discharge path of the oil pump 12, and a release valve 13 for opening and closing the release path 25, a release valve control unit 20 is set such that, when an engine rotational speed R is in a middle rotation region between a low-rotation threshold r1 and a high-rotation threshold r2, the release valve 13 is valve-opened when engine torque T is lower than a load threshold Ta, on the other hand, the release valve 13 is valve-closed when the engine torque T is equal to the load threshold Ta or higher, and the load threshold Ta is reduced accompanied by an increase of the engine rotational speed R.SELECTED DRAWING: Figure 1

Description

The present invention relates to a supply control technique for an engine oil supply device in an engine.

An engine mounted on a vehicle or the like is provided with an engine oil supply device that supplies engine oil to each sliding portion of the engine. The engine oil supply device includes an oil pump driven by the engine, and supplies engine oil to each sliding portion as the engine is driven.

As shown in Patent Document 1, for example, the engine oil supply device includes a relief valve in an oil passage for supplying engine oil from an oil pump to each sliding portion. The relief valve prevents the discharge pressure of the oil pump from rising more than necessary and suppresses the engine load for driving the oil pump. As a result, the decrease in engine fuel efficiency is suppressed.

Further, the engine oil supplied by the oil pump has an effect of suppressing an excessive temperature rise by being injected into a piston or the like in addition to lubricating the sliding portion. Further, as described in Patent Document 2, the engine oil supplied from the oil pump is supplied to the actuator of the chain adjuster of the engine to maintain the tension of the timing chain.

Japanese Patent No. 55155515 Japanese Unexamined Patent Publication No. 2016-118254

By the way, in the engine oil supply device that supplies engine oil for lubrication and cooling of the engine as described above, the required supply amount and the required supply pressure of the engine oil from the oil pump are the operating conditions such as the engine rotation speed and the load. It changes depending on. Further, the required supply amount of engine oil may change depending on the state of the supply destination of engine oil such as the chain adjuster of Patent Document 2.

Regarding this point, in Patent Document 1, the valve opening pressure of the relief valve is lowered in the low rotation and low load region of the engine to reduce the discharge pressure of the oil pump, that is, the supply pressure of the engine oil to reduce the drive load of the oil pump. It is disclosed to reduce and improve the fuel efficiency of the engine.

However, in recent years, there has been an increasing demand for further improving the fuel efficiency of the engine. Therefore, it is required to more appropriately control the supply of engine oil by the oil pump to further improve the fuel efficiency of the engine while ensuring the supply performance of the engine oil.

The present invention has been made to solve such a problem, and an object of the present invention is to provide an engine oil supply device that improves engine fuel efficiency while ensuring engine oil supply performance. is there.

In order to achieve the above object, the engine oil supply device of the present invention is driven by an engine, and supplies engine oil to a supply target in the engine to lubricate or cool the oil pump, and the suction path side and discharge of the oil pump. An engine oil supply device having a connection path connecting the roads and an on-off valve for opening and closing the connection path, a rotation speed detection unit for detecting the rotation speed of the engine, and a load of the engine. A load detection unit, a control unit that controls opening and closing of the on-off valve based on the rotation speed and load of the engine, and
The control unit opens the on-off valve when the load of the engine is less than a predetermined threshold value at a rotation speed in a predetermined range of the engine, while the load of the engine is equal to or higher than the predetermined threshold value. When this is the case, the on-off valve is closed, and the predetermined threshold value is set so as to decrease as the rotation speed increases.

As a result, when the engine rotation speed is within a predetermined range and the engine load is less than a predetermined threshold value, the on-off valve is opened, so that the discharge pressure of the oil pump is lowered to reduce the drive load of the oil pump by the engine. It can be suppressed. When the engine load is equal to or higher than the predetermined threshold value, the on-off valve is closed, so that the decrease in the discharge pressure of the oil pump is suppressed, the engine oil supply performance to the supply target is secured, and the load is increased. It is possible to appropriately cool the supply target whose temperature rises accordingly.

Further, when the rotation speed of the engine is within a predetermined range, the threshold value of the load of the engine for switching the opening and closing of the on-off valve is set to decrease as the rotation speed of the engine increases, so that the rotation speed of the engine increases. The engine oil supply performance can be ensured in response to the accompanying increase in the required supply amount of engine oil. Further, by setting the load threshold value to increase as the engine rotation speed decreases, the valve opening region of the on-off valve can be increased and the region for reducing the engine load can be expanded.

Further, preferably, the control unit closes the on-off valve in a low rotation region where the rotation speed of the engine is lower than the predetermined range, regardless of the load.

As a result, the discharge amount from the oil pump decreases in the low rotation speed region where the engine rotation speed is lower than the predetermined range, but the discharge pressure of the oil pump decreases by closing the on-off valve regardless of the engine load. It is possible to secure the supply performance of engine oil to the supply target.

Further, preferably, the control unit closes the on-off valve in a rotation speed region where the rotation speed of the engine is higher than the predetermined range, regardless of the load.

As a result, in the high rotation speed region where the engine speed is higher than the predetermined range, the discharge amount from the oil pump increases, but by closing the on-off valve regardless of the engine load, the discharge pressure of the oil pump can be increased. It is possible to suppress the decrease, sufficiently secure the supply performance of the engine oil to the supply target, and secure the lubrication performance and the cooling performance as the rotation speed of the engine increases.

Preferably, the engine includes a fuel injection learning control unit that detects a difference between a fuel injection amount command value and an actual fuel injection amount to learn a deviation amount, and the control unit is said by the fuel injection learning control unit. It is preferable to keep the on-off valve in the closed state during the learning.

As a result, the on-off valve is maintained in the closed state during the learning by the fuel injection learning control unit, so that the change in the engine load can be suppressed and the learning accuracy can be improved.

Preferably, the tilt detector for detecting the tilt of the engine is provided, the supply target includes an actuator for driving the chain tensioner of the engine, and the control unit is said to have the tilt of the engine in a predetermined tilt range. The on-off valve should be kept closed.

As a result, the on-off valve is kept in the closed state when the inclination of the engine is within a predetermined inclination range, so that the supply pressure of the engine oil to the actuator of the chain tensioner is prevented from being lowered, and the inclination of the engine is increased. It is possible to prevent malfunction of the chain tensioner caused by a decrease in the supply pressure of engine oil.

Preferably, the predetermined tilt range may be set by the position of the top of the engine oil supply path to the actuator.

This keeps the on-off valve closed when the engine tilt is within the predetermined tilt range set by the position of the top of the engine oil supply path to the chain tensioner actuators, thus keeping the engine oil in the closed state. It is possible to prevent malfunction of the chain tensioner caused by a decrease in the position at the top of the supply path and the supply pressure of engine oil.

In the engine oil supply device of the present invention, when the engine rotation speed is within a predetermined range and the engine load is less than a predetermined threshold value, the on-off valve is opened to suppress the drive load of the oil pump by the engine, while the engine. When the load is equal to or greater than a predetermined threshold value, the on-off valve can be closed to ensure the engine oil supply performance to the supply target.

Furthermore, the engine oil supply performance is ensured by setting the engine rotation speed within a predetermined range so that the load threshold for switching the opening and closing of the on-off valve decreases as the engine rotation speed increases. The area for reducing the load on the engine can be expanded by increasing the valve opening area of the on-off valve while ensuring the lubrication performance and cooling performance of the supply target, and the fuel efficiency performance of the engine can be improved.

It is a schematic block diagram of the engine oil supply device of one Embodiment of this invention. This is an example of a map for determining the opening / closing of a release valve in the engine oil supply device of the present embodiment. It is a graph which shows the vertical position of the uppermost part of the oil passage when tilted in the left-right direction when the rearward inclination angle of an engine is a predetermined angle.

Hereinafter, an embodiment of an engine oil supply device that embodies the present invention will be described.

The engine oil supply device 1 of the present embodiment is provided in the engine 2 mounted on the vehicle.

The engine oil supply device 1 is a device that supplies engine oil to the sliding portion 3 of the engine 2 and the cooling target 4.

The sliding portion 3 is, for example, a crankshaft, a connecting rod, a piston, a cylinder head, a camshaft, and a camshaft shear of the engine 2. The engine oil supply device 1 supplies engine oil to these sliding portions 3 to reduce the frictional resistance in the sliding portions 3.

The cooling target 4 is, for example, the back portion of the piston of the engine 2. The engine oil supply device 1 cools the cooling target 4 by injecting and supplying engine oil to the cooling target 4, for example, and suppresses an excessive temperature rise of the engine 2.

Further, the engine oil supply device 1 supplies engine oil to the actuator 6 of the chain adjuster 5 (chain tensioner) of the engine 2, for example, other than the sliding portion 3 and the cooling target 4, to apply tension to the timing chain of the engine 2. To do.

The engine oil supply device 1 includes an oil pan 11, an oil pump 12, a release valve 13 (open / close valve), a front-rear tilt angle sensor 14 (tilt detector), a left-right tilt angle sensor 15 (tilt detector), and a release valve control. It has a unit 20 (control unit).

The oil pan 11 is provided in the lower part of the engine 2 and stores engine oil.

The oil pump 12 sucks the engine oil stored in the oil pan 11 through the suction passage 21 and supplies the engine oil to the supply targets such as the sliding portion 3, the cooling target 4, and the actuator 6 via the discharge passage 22. The oil pump 12 is installed in the cylinder block of the engine 2, and is driven by driving the crankshaft 23 of the engine 2 via, for example, a timing chain. That is, the discharge amount of the oil pump 12 (the amount of engine oil supplied) changes according to the rotation speed of the engine 2. When the engine 2 is stopped, the supply amount is 0, and the supply amount increases as the engine speed increases.

At the tip of the suction path 21 connected to the suction port of the oil pump 12, a strainer 24, which is a filter arranged so as to be immersed in the engine oil in the oil pan 11, is provided.

The release valve 13 is an electromagnetic relief valve and is provided in a release path 25 (connection path) that opens from the discharge path 22 of the oil pump 12 to the oil pan 11, that is, the suction path 21 side of the oil pump 12 and the discharge path 22. The release path 25 is provided to connect the release path 25, and the release path 25 is opened and closed. The release valve 13 is a normally closed valve that is normally closed by a spring, and the discharge pressure is released by opening the valve when the discharge pressure of the oil pump 12 exceeds a predetermined pressure (maximum required pressure). It has a function to suppress the pressure below a predetermined pressure. Further, the release valve 13 includes an electromagnetic solenoid and has a function of opening and closing the release path 25 by a control signal from the release valve control unit 20.

The front-rear tilt angle sensor 14 detects the front-rear tilt angle of the vehicle, that is, the front-rear tilt angle of the engine 2.

The left-right tilt angle sensor detects the tilt angle of the vehicle in the vehicle width direction, that is, the tilt angle of the engine 2 in the left-right direction.

The release valve control unit 20 includes an input / output device, a storage device (ROM, RAM, non-volatile RAM, etc.), a central processing unit (CPU), and the like.

The release valve control unit 20 inputs the rotation speed (engine rotation speed R) and load (engine torque T) of the engine 2 from the engine control unit 30 that controls the operation of the engine 2, and the vehicle is tilted from the front-rear direction tilt angle sensor 14. The release valve 13 is controlled to open and close by inputting the tilt angle in the front-rear direction and the tilt angle in the vehicle width direction from the left-right tilt angle sensor 15. The engine control unit 30 corresponds to the rotation speed detection unit and the load detection unit in the present invention.

FIG. 2 is an example of an open / close determination map of the release valve 13 in the engine oil supply device 1.

The release valve control unit 20 stores an open / close determination map of the release valve 13 as shown in FIG. 2, and displays the map based on the current engine rotation speed R and engine torque T input from the engine control unit 30. It is used to control the opening and closing of the release valve 13.

As shown in FIG. 2, the release valve control unit 20 closes the release valve 13 regardless of the engine torque T in the low rotation region where the engine rotation speed R is lower than the low rotation threshold value r1. The low rotation threshold value r1 may be appropriately set near the upper limit of the engine rotation speed R, which may cause the discharge amount of the 12 oil pumps to become insufficient as the engine rotation speed R decreases. For example, it should be set to about 1200 rpm. Just do it.

In the high rotation region where the engine rotation speed R is higher than the high rotation threshold r2, the release valve 13 is closed regardless of the engine torque T. If the high rotation speed r2 is appropriately set near the lower limit of the engine rotation speed R, which may cause the discharge amount of the oil pump 12 to be insufficient with respect to the increase in the required supply amount due to the increase in the engine rotation speed R. Well, for example, it may be set to about 3000 rpm.

Further, in the medium rotation region where the engine rotation speed R is between the low rotation threshold value r1 and the high rotation threshold value r2, the release valve 13 is opened and closed according to the engine torque T. Specifically, in the medium rotation region, the load threshold value Ta is set according to the engine rotation speed R, and when the engine torque T is equal to or higher than the load threshold value Ta, the release valve 13 is closed. On the other hand, when the engine torque T is less than the load threshold value Ta, the release valve 13 is opened (hatched portion by a diagonal line rising to the right in FIG. 2). The medium rotation region in which the engine rotation speed R is between the low rotation threshold r1 and the high rotation threshold r2 corresponds to the rotation speed in the predetermined range of the present invention, and the load threshold Ta corresponds to the predetermined threshold of the present invention. To do.

As shown by the alternate long and short dash line in FIG. 2, the load threshold value Ta is set to decrease as the engine rotation speed R increases in the medium rotation region.

The load threshold Ta may be changed so as to decrease as the engine speed R increases as described above as the engine speed R changes over the entire region of the medium rotation region. It may be set to change as described above with the change of the engine rotation speed R in a part of the medium rotation speed region. When the load threshold value Ta is changed in a part of the medium rotation region as described above, the load threshold Ta may be made constant in other regions of the medium rotation region, for example.

As described above, in the present embodiment, when the engine torque T is less than the load threshold Ta in the medium rotation speed region, the release valve 13 is opened, so that the discharge pressure of the oil pump 12 is lowered. The drive load of the oil pump 12 can be suppressed. As a result, the fuel efficiency of the engine 2 that drives the oil pump 12 can be improved.

When the engine rotation speed R is in the medium rotation region, the sliding resistance in the sliding portion 3 of the engine 2 is relatively low, and when the engine torque T is less than the load threshold Ta, the temperature inside the engine 2 is reached. Is relatively suppressed, so that even if the release valve 13 is opened and the supply pressure and supply amount of engine oil decrease, the lubrication performance of the sliding portion 3 and the cooling performance of the cooling target 4 are ensured.

On the other hand, when the engine rotation speed R is in the medium rotation region and the engine torque T is equal to or higher than the load threshold Ta, the engine temperature may rise significantly. Therefore, the release valve 13 is closed to oil. It is possible to suppress a decrease in the discharge pressure of the pump 12 and secure the supply of engine oil to a high temperature portion (cooling target 4) such as a piston of the engine 2 to ensure cooling performance.

In particular, in the present embodiment, the load threshold value Ta is set to decrease as the engine rotation speed R increases in the medium rotation region. Since it is necessary to improve the lubrication performance and the cooling performance by increasing the engine rotation speed R, the supply performance of the oil pump 12 can be ensured by lowering the load threshold value Ta. In other words, by setting the load threshold Ta to increase as the engine speed decreases in the medium rotation region, the release valve 13 is opened while ensuring the lubrication performance and cooling performance by supplying engine oil. Therefore, the area where the drive load of the oil pump 12 is reduced can be increased, and the fuel efficiency of the engine 2 can be improved.

Further, when the engine rotation speed R is in the low rotation region lower than the low rotation threshold r1, the discharge amount from the oil pump 12 decreases, but the release valve 13 is closed regardless of the engine torque T. It is possible to suppress a decrease in the discharge pressure of the oil pump 12 and supply a required amount of engine oil to the sliding portion 3 to ensure lubrication performance.

Further, when the engine rotation speed R is in the high rotation speed region, the discharge amount from the oil pump 12 increases, but the lubrication performance of the sliding portion 3 and the cooling performance of the cooling target 4 are ensured as the rotation speed increases. It requires a large amount of engine oil to do so. Therefore, the release valve 13 can be closed to suppress a decrease in the discharge pressure of the oil pump 12, and the lubrication performance and the cooling performance can be ensured.

Further, the release valve control unit 20 maintains the release valve 13 in the closed state regardless of the engine rotation speed R and the engine torque T when the engine control unit 30 is performing minute Q-learning of the engine 2. .. The minute Q-learning is carried out in the engine control unit 30, and is carried out in a region where the engine rotation speed R and the engine torque T are small, as shown in the region of the hatched portion b by the downward sloping diagonal line in FIG. The micro Q-learning is known, for example, as described in the background technology of Japanese Patent Application Laid-Open No. 2010-112258, and is defined in order to improve the accuracy when the fuel injection amount of the engine is minute. This is a control for learning the difference in the actual fuel injection amount with respect to the fuel injection amount command value. The engine control unit 30 that performs minute Q-learning corresponds to the fuel injection learning control unit of the present invention.

In this way, during the minute Q-learning of the engine 2 in the engine control unit 30, the release valve 13 is maintained in the closed state regardless of the engine speed R and the engine torque T, so that the minute Q-learning is in progress. It is possible to suppress the change in engine torque due to the opening and closing of the release valve 13 and improve the accuracy of minute Q learning.

Further, the release valve control unit 20 has a vehicle front-rear tilt angle (that is, the front-rear tilt angle of the engine 2) by the front-rear tilt angle sensor 14 and a vehicle width direction tilt angle (that is, the engine) by the left-right tilt angle sensor 15. The opening / closing control of the release valve 13 is performed based on the lateral inclination angle of 2). Specifically, in the release valve control unit 20, the engine 2 has a predetermined tilt range so that the front-rear tilt angle of the vehicle is in a predetermined range and the vehicle width direction tilt angle is in a predetermined range. In this case, the release valve 13 is maintained in the closed state regardless of the engine speed R and the engine torque T. The predetermined inclination range is a value determined according to the structure of the oil passage 22a (supply passage) to the actuator 6 of the chain adjuster 5.

In the engine 2 of the present embodiment, the chain adjuster 5 is arranged on the front side surface of the engine 2. The actuator 6 of the chain adjuster 5 is operated by the engine oil supplied from the oil pump 12. When the engine 2 operates and the oil pump 12 operates, engine oil is supplied to the actuator 6 via the discharge passage 22 and the oil passage 22a, and the timing chain of the engine 2 is pushed by a tensioner (not shown) of the chain adjuster 5. Apply tension to the timing chain.

The mounting surface of the actuator 6 of the chain adjuster 5 has a structure in which engine oil leaks slightly, and the engine oil leaking from the mounting surface returns to the oil pan 11 via the storage portion of the timing chain. ing. In this way, the engine oil supplied to the actuator 6 of the chain adjuster 5 has a structure that can be slightly circulated. Therefore, for example, air is sucked from the oil pan 11 together with the engine oil and the oil passage 22a to the actuator 6 ( Even if air is mixed into the supply path), it leaks from the mounting surface of the actuator 6 together with the engine oil and is discharged from the oil passage 22a.

However, depending on the inclination angle of the engine 2, the vicinity of the engine oil inlet 22b of the actuator 6 may be the uppermost position of the oil passage 22a, which may be higher than the mounting surface of the actuator 6. When a part of the oil passage 22a becomes higher than the air outlet in this way and the oil pressure of the engine oil drops further as the rotation speed of the engine 2 decreases, the oil passage 22a near the inlet 22b of the actuator 6 There is a possibility that air will accumulate without being discharged. If air is not discharged from the oil passage 22a near the inlet 22b of the actuator 6 in this way, the chain adjuster 5 cannot sufficiently apply tension, and the timing chain may flutter.

In the present embodiment, when the inclination angle of the engine 2 is within a predetermined inclination range as described above, the release valve 13 is maintained in the closed state regardless of the engine rotation speed R and the engine torque T, so that the oil pump 12 It is possible to suppress a decrease in discharge pressure. As a result, it is possible to prevent air from accumulating in a part of the oil passage 22a to the actuator 6 due to the inclination of the engine 2.

Regarding the predetermined inclination range, when the release valve 13 is opened in the medium rotation region, air is accumulated at any position of the oil passage 22a and the timing chain is fluttered. You can check and set it.

FIG. 3 is a graph showing the vertical position of the uppermost portion of the oil passage 22a when the engine 2 is further tilted in the left-right direction (vehicle width direction) when the rearward inclination angle θrear is a predetermined angle θrear1. The predetermined angle θrear1 is the minimum value of the rearward inclination angle θrear in which air collects in a part of the oil passage 22a when the engine 2 is not tilted in the left-right direction (θright = 0).

In the engine 2 of the present embodiment, since the chain adjuster 5 and the actuator 6 are arranged on the side surface on the front side of the vehicle, the position of the actuator 6 is raised by tilting the engine 2 backward. Then, according to an experiment, when the rearward inclination angle θrear of the engine 2 is a predetermined angle θrear1 or more, the lateral inclination angle of the engine 2, specifically, the rightward inclination angle θright is in the range of 0 degrees to the predetermined angle θright1. It was confirmed that the vertical position of the uppermost portion of the above portion became the predetermined height H1 or more, and the timing chain fluttered. In FIG. 3, the shaded portion between the rightward inclination angle θright of 0 degree and the predetermined angle θright1 is the range in which the timing chain flutters. Therefore, the release valve 13 should be closed and controlled with the rearward tilt angle θrear of the engine 2 being equal to or greater than the predetermined angle θrear1 and the range between 0 and θright1 of the rightward tilt angle θright of the engine 2 as the predetermined tilt range. Just do it.

Alternatively, the release valve control unit 20 sets the left-right tilt angle of the engine 2 in which the timing chain flutters at each front-rear tilt angle of the engine 2, in other words, the position of the uppermost portion of the oil passage 22a is a predetermined height H1. The left-right tilt angle of the engine 2 as described above may be stored, and the release valve 13 may be controlled to open / close based on the front-back tilt angle and the left-right tilt angle of the engine 2.

By controlling the opening and closing of the release valve 13 based on the tilt angle of the vehicle, that is, the tilt angle of the engine 2, the discharge pressure of the oil pump 12 decreases due to the opening operation of the release valve 13. It is possible to prevent air accumulation in the oil passage 22a and avoid malfunction of the chain adjuster 5.

Although the description of the embodiment is completed above, the aspect of the present invention is not limited to the above embodiment. For example, the release valve 13 is set to open / close at least based on the engine rotation speed R and the engine torque T, and the load threshold Ta is lowered as the engine rotation speed increases in a predetermined medium rotation region. Other settings may be changed as appropriate.

Further, maintaining the closed state of the release valve 13 at the time of learning the minute Q and maintaining the closed state of the release valve 13 due to the tilt angle (of the engine 2) of the vehicle are executed as necessary according to the configuration and specifications of the engine 2. , The area to be executed may be set as appropriate.

Further, although the tilt angle sensor has been described as the tilt detector, the tilt direction and the tilt amount of the engine 2 are calculated from the acceleration sensor that detects the acceleration in the front-rear direction and the left-right direction of the engine 2, and the tilt in which an abnormal noise is generated. The release valve 13 may be controlled to open and close in comparison with the direction and the amount of inclination.

Further, although the release path 25 is connected to the discharge path 22 of the oil pump 12 and the oil pan 11, it may be a bypass path connecting the discharge path 22 of the oil pump 12 and the suction path 21.

Further, in the present embodiment, the release valve control unit 20 is a separate unit from the engine control unit 30, but the engine control unit 30 may include the release valve control unit 20.

The present invention can be widely applied to various engines that are lubricated and cooled by engine oil.

1 Engine oil supply device 2 Engine 3 Sliding part (Supply target)
4 Cooling target (supply target)
5 Chain adjuster (chain tensioner)
6 Actuator (Supply target)
12 Oil pump 13 Release valve (on-off valve)
14 Front-back tilt angle sensor (tilt detector)
15 Left-right tilt angle sensor (tilt detector)
20 Release valve control unit (control unit)
22a Oil channel (supply channel)
25 release path (connection path)
30 Engine control unit (rotation speed detection unit, load detection unit, fuel injection learning control unit)

Claims (6)

An oil pump that is driven by an engine and supplies engine oil to a supply target in the engine to lubricate or cool it.
A connection path connecting the suction path side and the discharge path of the oil pump,
An on-off valve that opens and closes the connection path,
It is an engine oil supply device that has
A rotation speed detection unit that detects the rotation speed of the engine,
A load detection unit that detects the load of the engine and
A control unit that controls opening and closing of the on-off valve based on the rotational speed and load of the engine.
With
The control unit opens the on-off valve when the load of the engine is less than a predetermined threshold value at a rotation speed within a predetermined range of the engine, while the load of the engine is equal to or more than the predetermined threshold value. To close the on-off valve
An engine oil supply device, wherein the predetermined threshold value is set so as to decrease as the rotation speed increases. The engine oil supply device according to claim 1, wherein the control unit closes the on-off valve regardless of the load in a low rotation speed region where the rotation speed of the engine is lower than the predetermined range. The engine oil supply device according to claim 1 or 2, wherein the control unit closes the on-off valve regardless of the load in a high rotation speed region where the rotation speed of the engine is higher than the predetermined range. .. The engine includes a fuel injection learning control unit that detects a difference between a fuel injection amount command value and an actual fuel injection amount and learns a deviation amount.
The engine oil supply device according to any one of claims 1 to 3, wherein the control unit maintains the on-off valve in a closed state during the learning by the fuel injection learning control unit. .. A tilt detector for detecting the tilt of the engine is provided.
The supply target includes an actuator for driving the chain tensioner of the engine.
The engine oil supply device according to any one of claims 1 to 4, wherein the control unit maintains the on-off valve in a closed state within a predetermined inclination range of the engine inclination. The engine oil supply device according to claim 5, wherein the predetermined inclination range is set by the position of the uppermost portion of the engine oil supply path to the actuator.

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