JP2019190298A - Oil circulation device of engine and circulation control device - Google Patents

Abstract

To provide an oil circulation device of an engine which allows for promotion of quick warmup.SOLUTION: An oil circulation device S of an engine 10 comprises: an oil supply path for supplying oil to the engine 10 from an oil pan 20; an oil outflow path for flowing out the oil to the oil pan 20 or the oil supply path from the engine; a heat accumulator 21 storing the oil at a high temperature higher than that of the oil pan 20; a first changeover part changing over a state that the oil in the oil pan flows into the engine 10 not via the heat accumulator 21, and a state that the oil in the oil pan 20 flows into the engine 10 via the accumulator 21 in the oil supply path; and a second changeover part changing over a state that the outflow oil flowing out from the engine 10 is returned to the oil pan 20, a state that the outflow oil flows into the oil supply path via the heat accumulator 21, and a state that the outflow oil flows into the oil supply path 20 not via the heat accumulator 21.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an engine oil circulation device and a circulation control device for controlling the oil circulation device.

  When starting the vehicle engine, it is desirable to warm up the engine body early to reduce friction loss. For example, in Patent Document 1, a heat accumulator is provided in an oil tank that stores engine oil, and after starting the engine, until the oil reaches a predetermined temperature, the oil is circulated between the heat accumulator and the engine, A configuration for early warm-up is disclosed.

JP 2002-174106 A

  However, in the configuration of Patent Document 1, the heat of the oil warmed by the engine is used to raise the temperature of the oil in the regenerator during the warm-up of the engine. Therefore, the early warm-up of the engine is impaired.

  The present invention has been made in view of the above problems, and a main object thereof is to provide an engine oil circulation device that can promote early warm-up.

  An oil circulator for an engine in which oil stored in an oil pan (20) is circulated to an engine (10) by an oil pump (32) to lubricate sliding parts (13, 15). An oil supply path (L1, L2) for supplying oil from the pan to the engine, an oil outflow path (L2, L4, L5) for flowing oil from the engine to the oil pan or the oil supply path, and the oil pan A heat accumulator (21) for storing oil at a higher temperature, a state in which oil in the oil pan flows into the engine via the heat accumulator in the oil supply path, and the oil in the oil pan through the heat accumulator. A first switching unit (41) for switching between a state of flowing into the engine without intervention, and the engine in the oil outflow path. A state in which spilled oil flowing out from the oil pan is returned to the oil pan, a state in which the spilled oil flows into the oil supply path through the heat accumulator, and a state in which the spilled oil enters the oil supply path without passing through the heat accumulator. And a second switching unit (42, 43) for switching between the states to be introduced.

  In the supply path, the first switching unit switches between a state in which the temperature of the oil pan is caused to flow through the heat accumulator and the oil in the oil pan flows into the engine and a state in which the oil in the oil pan is caused to flow into the engine without going through the heat accumulator. ing. In this case, for example, when the engine is cold, high-temperature oil can be supplied from the heat accumulator to the engine, and in other cases, the oil can be supplied to the engine without going through the heat accumulator.

  In the oil outflow path, the second switching is performed between the state of returning to the oil pan without passing through the heat accumulator, the state of flowing back into the engine via the heat accumulator, and the state of flowing into the oil supply path without passing through the heat accumulator. Switching by part. By having the state of flowing into the supply path without going through the heat accumulator, the outflow oil can be supplied to the engine again without being mixed with the oil in the oil pan or the heat accumulator. In particular, when the temperature of the oil in the regenerator is lower than the temperature of the spilled oil, the oil can be supplied to the engine without being mixed with the oil in the regenerator and lowering the temperature of the spilled oil. Therefore, early warm-up of the engine can be promoted.

Schematic block diagram of the oil circulation device of the first embodiment (A)-(d) is a state explanatory drawing which shows the oil path of a 1st-4th state, (e) is a time chart which shows transition of the oil temperature of a 1st-4th state. Flow chart showing processing procedure in the circulation control device Schematic block diagram of the oil circulation device of the second embodiment Schematic block diagram of the oil circulation device of the third embodiment Plan view of the cylinder block of the third embodiment Sectional drawing in the VII-VII position in FIG. Schematic block diagram of the oil circulation device of the fourth embodiment Plan view of the cylinder block of the fourth embodiment Sectional drawing in the XX position in FIG.

<First Embodiment>
DESCRIPTION OF EXEMPLARY EMBODIMENTS Embodiments of the invention will be described below with reference to the drawings. In the following embodiments, the same or equivalent portions are denoted by the same reference numerals in the drawings. In the present embodiment, an oil circulation device that circulates oil that lubricates a sliding portion of the engine in a vehicle that runs using the engine as a drive source is embodied.

  FIG. 1 is a schematic configuration diagram of an oil circulation device S of the engine 10. The engine 10 includes a cylinder head 11 and a cylinder block 12 connected to the cylinder head 11. An oil pan 20 is attached to the lower part of the cylinder block 12, and oil for lubricating the inside of the engine 10 is stored in the oil pan 20.

  The cylinder head 11 is provided with an in-cylinder head sliding portion 13. The in-cylinder head sliding portion 13 includes a valve operating system such as a camshaft for driving an intake valve and an exhaust valve in the combustion chamber, a turbocharger, and the like.

  A main gallery 14 is formed in the cylinder block 12. The main gallery 14 is an oil passage formed in the cylinder block 12 and supplies oil to each part. The cylinder block 12 is provided with a cylinder block sliding portion 15. The cylinder block sliding portion 15 includes a piston, a connecting rod, a crankshaft, and the like.

  An oil supply path is provided as a path for supplying oil from the oil pan 20 to the engine 10. The oil supply path has a first path L1 that connects the oil pan 20 and the main gallery 14. A strainer 31, an oil pump 32, and an oil cooler 33 are provided in the first path L1.

  The strainer 31 is provided on the upstream side of a connection point N1, which will be described later, specifically, near the connection position of the oil pan 20 to the first path L1. The strainer 31 is for removing dust contained in the oil, and is composed of, for example, a metal wire mesh.

  The oil pump 32 is a pump for supplying oil to each part in the engine 10, and is driven by the engine 10. An oil filter for removing foreign substances in the oil is provided in the vicinity of the upstream or downstream of the oil pump 32. The oil filter removes fine foreign matters such as fine metal powder in the oil.

  The oil cooler 33 is a heat exchanger that is provided on the downstream side from a connection point N2 described later, and performs heat exchange between cooling water that cools the engine 10 and oil. When the oil temperature is higher than the cooling water temperature, the oil is cooled, and when the oil temperature is lower than the cooling water temperature, the oil is heated. By providing the oil cooler 33 on the downstream side (engine 10 side) of the oil pump 32, it becomes easy to flow oil through the oil cooler 33 having a relatively large flow path resistance.

  The oil circulation device S is provided with a heat accumulator 21 that stores oil having a temperature higher than that of the oil pan 20. The oil supply path for supplying oil from the oil pan 20 is provided as a parallel path branched into two paths, and one of them has a second path L <b> 2 through the heat accumulator 21. In this case, the second path L2 branches from the first path L1 at the connection point N1, and joins the first path L1 at the connection point N2 via the heat accumulator 21. A first control valve 41 that is a three-way valve is provided at the connection point N2. The first control valve 41 switches a path between a first path L1 that does not pass through the heat accumulator 21 and a second path L2 that passes through the heat accumulator 21.

  An oil outflow path through which oil flows out from the engine 10 to the first path L1 or the oil pan 20 is provided. The oil outflow path is a path through which oil supplied from the main gallery 14 and lubricated the cylinder head sliding portion 13 flows out. The oil outflow path has a third path L3 that is a first outflow path connecting the in-cylinder head sliding portion 13 (engine 10) and the oil pan 20. The oil that has lubricated the sliding portion 15 in the cylinder block falls from the cylinder or the crankcase of the cylinder block 12 and returns to the oil pan 20.

  The oil supply path has a fourth path L4 that is a second outflow path connected from the third path L3 to the first path L1. The fourth path L4 is a path that returns oil from the cylinder head sliding portion 13 to the first path L1 that is the oil supply path without passing through the heat accumulator 21, and branches from the third path L3 at the connection point N3. Thus, the first path L1 is joined at the connection point N1 without going through the heat accumulator 21. Note that at the connection point N1, oil is supplied from the oil pan 20 and from the fourth path L4. However, by adjusting the flow path resistance and the like, the oil from the fourth path L4 has priority and the first path L1. It is supposed to flow through. A second control valve 42 that is a three-way valve is provided at the connection point N3. The second control valve 42 switches the path between the third path L3 that returns to the oil pan 20 and the fourth path L4 that returns to the first path L1 without going through the heat accumulator 21.

  The oil supply path has a fifth path L5 which is a third outflow path connected to the heat accumulator 21 from the third path L3. The fifth path L5 is a path that returns oil from the cylinder head sliding portion 13 to the first path L1 that is the oil supply path via the heat accumulator 21, and branches from the third path L3 at the connection point N4. , Via the heat accumulator 21, it joins the first path L1 at the connection point N1. The connection point N4 is upstream from the connection point N3, and a third control valve 43 that is a three-way valve is provided at the connection point N4. The third control valve 43 switches the path between the third path L3 returning to the oil pan 20 and the fifth path L5 returning to the first path L1 via the heat accumulator 21. In addition, each path | route L1-L5 may be comprised as a channel | path formed in the engine 10, may be comprised as piping provided outside the engine 10, and may be comprised combining these. . The first control valve 41 corresponds to a “first switching unit”, and the second control valve 42 and the third control valve 43 correspond to a “second switching unit”.

  The oil circulation device S includes a control device 50 that controls the oil circulation device S of the engine 10 by controlling the control valves 41, 42, and 43. The control device 50 is constituted by a microcomputer including a CPU, a ROM, a RAM, an input / output interface, and the like. For example, an ECU that performs control such as ignition of the engine 10 is connected to the control device 50 and can communicate with the control device 50. The control device 50 corresponds to a “circulation control device”.

  Various sensors are connected to the control device 50. For example, a first temperature sensor 51 that detects the temperature of oil flowing out from the engine 10 (sliding portion 13 in the cylinder head) is provided on the upstream side of the third path L3. In addition, a second temperature sensor 52 that detects the temperature of oil in the regenerator 21 is provided in the regenerator 21.

  Next, the oil path formed by switching the control valves 41, 42, 43 will be described with reference to FIG. In FIG. 2, (a) to (d) show four states in the oil circulation device S of the present embodiment, and (e) shows time-series changes in the four states after engine startup. Yes. Here, the state of FIG. 2A is the first state, the state of FIG. 2B is the second state, the state of FIG. 2C is the third state, and the state of FIG. 2D is the fourth state. It is said. In FIG. 2, the reference numerals are illustrated in FIG. 2A, and the reference numerals are omitted in FIGS. 2B to 2D because they are common.

  In the first state shown in FIG. 2A, the oil is supplied from the oil pan 20 to the engine 10 via the heat accumulator 21 on the oil supply side. In this case, an oil supply path (second path L2) through which the oil in the oil pan 20 flows into the engine 10 via the heat accumulator 21 is formed. On the oil outflow side, the engine 10 and the oil pan 20 are connected by a first outflow path (third path L3), and the oil is returned from the engine 10 to the oil pan 20 through the third path L3. In the first state, heat dissipation using heat storage of the heat accumulator 21 is performed.

  In the second state shown in FIG. 2B, oil is supplied from the oil pan 20 to the engine 10 without passing through the heat accumulator 21 on the oil supply side. In addition, on the oil outflow side, the oil flowing out from the engine 10 passes through the first outflow path (third path L3) and the second outflow path (fourth path L4), and the oil supply path ( It is returned to the first path L1) side. In this case, the spilled oil from the engine 10 can be circulated through a circulation path that does not pass through either the oil pan 20 or the heat accumulator 21. In the oil circulation state, the oil shortage is appropriately supplemented from the oil pan 20. In the second state, the temperature rise performance is maintained by returning the spilled oil from the engine 10 to the engine 10 as it is.

  In the third state shown in FIG. 2C, oil is supplied from the oil pan 20 to the engine 10 without passing through the heat accumulator 21 on the oil supply side. In addition, on the oil outflow side, the spilled oil from the engine 10 passes through the heat storage device 21 through the first outflow path (third path L3) and the third outflow path (fifth path L5). 1 path L1) is returned. In this case, the spilled oil from the engine 10 can be circulated through a circulation path that passes through the heat accumulator 21. In the oil circulation state, the oil shortage is appropriately supplemented from the oil pan 20. In the third state, heat storage in the heat storage unit 21 is performed.

  In the fourth state shown in FIG. 2D, oil is supplied from the oil pan 20 to the engine 10 without passing through the heat accumulator 21 on the oil supply side. That is, the oil in the oil pan 20 is supplied to the engine 10 through the first path L1. Further, on the oil outflow side, the outflow oil from the engine 10 is returned to the oil pan 20 through the first outflow path (third path L3). In the fourth state, the oil temperature is maintained.

  The first to fourth states are switched in time series as shown in FIG. In this case, after the engine 10 is started, each state is switched as the engine 10 is warmed up. The details will be described later.

  Next, oil circulation control by the control device 50 will be described with reference to FIGS. FIG. 3 is a flowchart showing a processing procedure of oil circulation control in the control device 50, and this processing is repeatedly performed by the control device 50 at a predetermined cycle.

  First, in step S10, the temperature of the spilled oil flowing out from the engine 10 (sliding portion 13 in the cylinder head) is acquired. Specifically, the temperature of the spilled oil detected by the first temperature sensor 51 is acquired. In step S11, it is determined whether the temperature of the obtained spilled oil is equal to or higher than a predetermined value. That is, it is determined whether the temperature of the spilled oil has reached the target oil temperature and the engine 10 has been warmed up. Step S11 corresponds to a “temperature determination unit”.

  If it is determined in step S11 that the temperature of the spilled oil is lower than the predetermined value (if step S11 is negative), the temperature of the oil in the regenerator 21 detected by the second temperature sensor 52 is determined in step S12. get. In step S13, it is determined whether there is high-temperature oil based on the temperature of the oil in the heat accumulator 21 acquired in step S12. It can be estimated from the temperature of the oil in the heat accumulator 21 whether high-temperature oil remains. Since oil from the oil pan 20 flows into the heat accumulator 21 and high-temperature oil is supplied, the oil temperature in the heat accumulator 21 gradually decreases. Therefore, it can be determined whether there is high-temperature oil in the heat accumulator 21 based on the oil temperature in the heat accumulator 21.

  The state in which there is no high-temperature oil in the regenerator 21 is not only the state in which no high-temperature oil remains, but the temperature of the oil in the regenerator 21 is lower than the temperature of the spilled oil, or a predetermined temperature. It also includes a state where it is lower than that, that is, a state where the remaining amount of hot oil is low. Further, when determining whether or not there is high-temperature oil in the regenerator 21, the determination may be based on the amount of oil supplied from the regenerator 21 instead of the temperature of the oil in the regenerator 21. For example, a flow rate sensor is provided in the second path L2, and the remaining oil amount is calculated by subtracting the accumulated flow rate of oil flowing out from the heat accumulator 21 detected by the flow rate sensor from the capacity of the heat accumulator 21, so You may determine whether there is. Step S13 corresponds to a “heat storage determination unit”.

  If it is determined in step S13 that there is high-temperature oil in the heat accumulator 21, control is performed in step S14 to set the first state in which heat is released using the heat storage of the heat accumulator 21. Specifically, the first control valve 41 is switched so that the oil flows in the second path L2, and the second control valve 42 and the third control valve 43 are controlled so that the oil flows in the third path L3. The process is terminated. Step S14 corresponds to a “first control unit”.

  If it is determined in step S13 that there is no high-temperature oil in the heat accumulator 21, control is performed in step S15 so that the oil flowing out from the engine 10 is returned to the engine 10 as it is. Specifically, the first control valve 41 is switched so that oil flows through the first path L1, the second control valve 42 is switched so that oil flows through the third path L3, and the oil flows through the fourth path L4. Thus, the control for switching the third control valve 43 is performed, and the process ends. Step S15 corresponds to a “second control unit”.

  On the other hand, if it is determined in step S11 that the temperature of the spilled oil is equal to or higher than a predetermined value, the temperature of oil in the heat accumulator 21 is acquired in step S17. Specifically, the temperature of the oil in the heat accumulator 21 detected by the second temperature sensor 52 is acquired. Then, it is determined whether the temperature of the oil in the heat accumulator 21 acquired in step S17 is equal to or higher than a predetermined value. That is, it is determined whether high-temperature oil is stored in the regenerator 21.

  If it is determined in step S17 that the temperature of the oil in the heat accumulator 21 is lower than a predetermined value, that is, if high-temperature oil is not stored in the heat accumulator 21, the heat accumulator 21 is filled in step S18. Control is performed to enter the third state for storing hot oil. Specifically, the first control valve 41 is switched so that oil flows through the first path L1, and the third control valve 43 is switched so that oil flows through the fifth path L5, and the process ends. Note that the second control valve 42 need not be particularly controlled to switch the route. Step S18 corresponds to a “third control unit”.

  If it is determined in step S17 that the temperature of the oil in the heat accumulator 21 is equal to or higher than a predetermined value, that is, if high-temperature oil for the next warm-up is stored in the heat accumulator 21, the fourth in step S19. Implement the control to make the state. Specifically, the first control valve 41 is switched so that oil flows in the first path L1, and the second control valve 42 and the third control valve 43 are controlled so that oil flows in the third path L3. The process ends.

  In step S16 and step S17, the temperature of the oil in the heat accumulator 21 is acquired, and step S18 and step S19 are switched based on the temperature of the oil in the heat accumulator 21. Instead, it may be determined to switch between step S18 and step S19 based on the flow rate of the oil flowing into the heat accumulator 21, the time when the oil flows, and the like.

  Next, switching of the temperature of the spilled oil and the oil path will be described with reference to FIG. FIG.2 (e) is a time chart which shows the temperature change of the spilled oil in a 1st-4th state. The solid line in the figure shows the temperature of the spilled oil in the present embodiment, and the broken line in the figure shows the temperature of the conventional spilled oil.

  When the engine 10 is started at the timing t1, the oil pump 32 is driven and oil starts to circulate. In the first state after engine startup (the state shown in FIG. 2A), the temperature of the engine 10 is low and the temperature of the spilled oil (oil temperature) is low, while hot oil is stored in the heat accumulator 21. ing. Therefore, in the first state, the oil in the oil pan 20 is caused to flow into the engine 10 via the heat accumulator 21. That is, after the engine 10 is started, the high-temperature oil of the heat accumulator 21 is supplied to the engine 10, so that heat dissipation using the heat accumulation of the heat accumulator 21 is performed. On the other hand, the oil that has flowed out of the engine 10 is returned to the oil pan 20 without passing through the heat accumulator 21. In the heat accumulator 21, high-temperature oil is supplied to the engine 10, while cold oil is introduced from the oil pan 20, and the remaining amount of high-temperature oil gradually decreases.

  At timing t2, the hot oil in the heat accumulator 21 disappears, and the temperature of the oil in the heat accumulator 21 becomes lower than the temperature of the spilled oil. After this timing t2, in the prior art, the oil that has flowed out flows into the heat accumulator 21 or the oil pan 20, and is used to raise the temperature of the oil in the heat accumulator 21 or the oil pan 20. Until the temperature of the entire oil in the heat accumulator 21 or the oil pan 20 is raised by the oil that has flowed out, oil having a temperature lower than that of the outflow oil in the heat accumulator 21 or the oil pan 20 has been supplied to the engine 10. Therefore, since the oil whose temperature is lower than the oil spilled from the engine 10 is supplied until the temperature of the whole oil in the heat accumulator 21 or the oil pan 20 rises, the temperature rise slows down and early warm-up is difficult. there were.

  Therefore, in this embodiment, when the hot oil in the heat accumulator 21 runs out at the timing t2, the second state (in FIG. 2B) in which the spilled oil flows into the first path L1 without passing through the heat accumulator 21. State). In the second state, the spilled oil whose temperature has been raised by the engine 10 is directly supplied to the first path L <b> 1 without being supplied through the heat accumulator 21 or the oil pan 20, and is supplied to the engine 10. By having the fourth path L4 that flows into the first path L1 without going through the heat accumulator 21, the outflow oil does not mix with the oil in the oil pan 20 or the heat accumulator 21, and the spilled oil is returned again. The engine 10 can be supplied. In particular, when the temperature of the oil in the regenerator 21 is lower than the temperature of the spilled oil, the oil can be supplied to the engine 10 without being mixed with the oil in the regenerator 21 and reducing the temperature of the spilled oil. That is, by returning the spilled oil from the engine 10 to the engine 10 as it is, the temperature rise performance is maintained, and the early warm-up of the engine 10 can be promoted.

  When the temperature of the spilled oil (oil temperature) reaches the target oil temperature at timing t3, a third state (the state shown in FIG. 2C) in which high-temperature oil is stored in the regenerator 21 is entered. In the third state, the oil flowing out from the engine 10 is supplied to the first path L1 via the heat accumulator 21. Therefore, while hot oil flows into the heat accumulator 21, the cooled oil in the heat accumulator 21 flows out and is supplied to the first path L1. Then, high-temperature oil for the next warm-up is stored in the heat accumulator 21. As soon as the target temperature is reached, high-temperature oil is stored in the regenerator 21, so that high-temperature oil for the next warm-up can be reliably stored.

  At timing t4, the temperature of the oil in the heat accumulator 21 becomes equal to or higher than a predetermined value. That is, when hot oil is stored in the heat accumulator 21, the fourth state (the state shown in FIG. 2D) is obtained. In the fourth state, oil is supplied from the oil pan 20 to the engine 10 without passing through the heat accumulator 21, and the oil flows out from the engine 10 to the oil pan 20. That is, the oil temperature is maintained.

  According to the embodiment described in detail above, the following excellent effects can be obtained.

  In the supply path, there are a state in which the temperature of the oil pan 20 is caused to flow into the engine 10 through the heat accumulator 21 and a state in which the oil in the oil pan 20 is caused to flow into the engine 10 without going through the heat accumulator 21. Switching is performed by the first control valve 41. In this case, for example, when the engine 10 is cold, high-temperature oil can be supplied from the heat accumulator 21 to the engine 10, and in other cases, oil can be supplied to the engine 10 without going through the heat accumulator 21.

  In the outflow path, the state of returning to the oil pan 20 without passing through the heat accumulator 21, the state of flowing into the first path L1 through the heat accumulator 21, and the flow into the first path L1 without passing through the heat accumulator 21. The state is switched by the second control valve 42 and the third control valve 43. By having a state of flowing into the first path L1 without going through the heat accumulator 21, the spilled oil is not mixed with the oil in the oil pan 20 or the heat accumulator 21, and the spilled oil is returned to the engine 10 again. Can be supplied. In particular, when the temperature of the oil in the regenerator 21 is lower than the temperature of the spilled oil, the oil can be supplied to the engine 10 without being mixed with the oil in the regenerator 21 and reducing the temperature of the spilled oil. Therefore, early warm-up of engine 10 can be promoted.

  After the engine 10 is started, the spilled oil is first returned to the oil pan 20, then returned to the first path L <b> 1 without going through the heat accumulator 21, and then the spilled oil is passed through the heat accumulator 21. Through the first path L1. Since the spilled oil immediately after the start of the engine 10 is cold, it is returned to the oil pan 20, and when the warming up proceeds to some extent and the temperature of the spilled oil rises, the spilled oil flows into the first path L1 and further flows out. When the temperature of the oil rises, the hot oil can be stored in the heat accumulator 21 for the next warm-up. By switching the 2nd control valve 42 and the 3rd control valve 43 so that it may become such an order, early warm-up can be promoted.

Second Embodiment
A second embodiment will be described with reference to FIG. In 2nd Embodiment, the position in which the oil cooler 33 which is a heat exchanger is provided differs from 1st Embodiment. Specifically, the oil cooler 33 is provided on a path that does not pass through the heat accumulator 21 in the oil supply path. FIG. 4 is a schematic configuration diagram of the oil circulation device S of the engine 10 in the second embodiment. Note that the control and the like in this embodiment are the same as those in the first embodiment, and a description thereof will be omitted.

  The oil cooler 33 is provided on the upstream side (oil pan 20 side) of the first control valve 41 in the first path L1 and on the downstream side (engine 10 side) of the connection point N1 with the fourth path L4. . That is, the oil cooler 33 is on the first path L1 which is a path on the side opposite to the heat accumulator (the side not passing through the heat accumulator 21) in the parallel path branched into two paths at the connection point N1 in the oil supply path, It is provided on the path after the oil has joined at the connection point N1 between the fourth path L4 and the fifth path L5, which are oil outflow paths.

  In the first state, oil is supplied from the oil pan 20 to the main gallery 14 through the second path L2 via the heat accumulator 21. That is, the hot oil in the regenerator 21 is supplied to the engine 10 (main gallery 14) without passing through the oil cooler 33. Therefore, in the first state, since the high-temperature oil is used for raising the temperature of the engine 10 without exchanging heat with the cooling water, the temperature raising efficiency of the engine 10 can be improved.

  In the second state, the spilled oil passes through the fourth path L4, joins the first path L1 at the connection point N1, and is supplied to the main gallery 14 via the oil cooler 33. That is, the spilled oil exchanges heat with the cooling water in the oil cooler 33 and is supplied to the engine 10 (main gallery 14). Here, since the temperature of the cooling water rises faster than that of the oil, it is considered that the temperature of the cooling water is higher than that of the oil in the second state where the warm-up has progressed to some extent. Therefore, the oil cooler 33 raises the temperature of the oil with the cooling water, thereby further promoting the temperature rise.

  Consider a case where the capacity of the heat accumulator 21 is large and the heat accumulator 21 has sufficient high-temperature oil to raise the temperature of the engine 10. When the capacity of the heat accumulator 21 is very large and there is a sufficient capacity for raising the temperature of the engine 10, it is considered that the temperature of the cooling water has reached the target water temperature when the second state is reached. . On the other hand, since the target oil temperature is generally set higher than the target water temperature, it is considered that the temperature of the spilled oil is equal to or higher than the target water temperature and has not reached the target oil temperature. In a state where the temperature of the spilled oil is higher than the water temperature of the oil cooler 33, if the oil cooler 33 is provided downstream of the connection point N1 in the first path L1, the oil temperature is cooled by the cooling water. It is not preferable. Therefore, when the capacity of the heat accumulator 21 is very large, the oil cooler 33 is desirably provided upstream of the connection point N1 in the first path L1. However, securing sufficient oil capacity for warming up the engine 10 in the regenerator 21 is not very realistic from the viewpoint of space and the amount of oil required.

  According to the embodiment described above in detail, the following excellent effects can be obtained in addition to the effects of the first embodiment.

  The oil supply path is a parallel path branched into two paths, one of which is the second path L2 that passes through the heat accumulator 21, and the other is the anti-heat accumulator 21 side, that is, the first that does not pass through the heat accumulator 21. This is the path L1. Since the oil cooler 33 is provided on the first path that does not pass through the heat accumulator 21, the high-temperature oil supplied from the heat accumulator 21 via the second path L2 is cooled by the oil cooler 33. Can be prevented. Therefore, the temperature raising efficiency can be increased.

  The oil cooler 33 is provided downstream of the connection point N1 with the fourth path L4 connected from the third path L3 to the first path L1 in the first path L1. Therefore, the oil that has passed through the fourth path L4 is heat-exchanged by the oil cooler 33. Since the cooling water of the oil cooler 33 cools the engine 10 and the temperature of the water is higher than that of the oil, it is considered that the temperature of the cooling water of the oil cooler 33 is higher than the temperature of the spilled oil. In such a case, the oil that has flowed through the fourth path L4 is warmed by the oil cooler 33, so that the temperature of the oil can be further increased and early warm-up becomes possible.

<Third Embodiment>
In the third embodiment, a passage between bores through which spilled oil flowing out from the cylinder head passes is provided in order to raise the temperature of the oil. Hereinafter, a detailed description will be given with reference to FIGS. FIG. 5 is a schematic configuration diagram of the oil circulation device S of the engine 10 in the third embodiment. 6 is a plan view of the cylinder block 12 (viewed from the cylinder head 11 side), and FIG. 7 is a cross-sectional view at the position VII-VII in FIG. 6 and 7, the IN side is described as the intake side, and the EX side is described as the exhaust side, and the arrows in the drawings indicate the flow of oil and cooling water. . Note that the control and the like in this embodiment are the same as those in the first embodiment, and a description thereof will be omitted.

  As shown in FIG. 5, the oil that has lubricated the in-cylinder head sliding portion 13 passes through each bore passage 61 formed in the cylinder block 12. Oil that has passed through the passages 61 between the bores flows into the third control valve 43. In other words, the oil that has lubricated the in-cylinder head sliding portion 13 passes through the inter-bore passage 61 before flowing into the third path L3. Since other routes and the like are the same as those in the first embodiment, description thereof will be omitted.

  A specific configuration of the inter-bore passage 61 and the like will be described with reference to FIGS. 6 and 7. The cylinder block 12 is a cylinder block of the in-line four-cylinder engine 10 that is a multi-cylinder engine, and includes four cylinder bores 62. A water jacket 63 for circulating cooling water is formed on the outer periphery of the cylinder bore 62. Between each cylinder bore 62, a drill path 64 for cooling between the cylinder bores 62 with cooling water is provided. The drill path 64 and the water jacket 63 communicate with the water jacket on the cylinder head 11 side.

  The inter-bore passage 61 is provided separately from the drill path 64 at a position between the cylinder bores 62 and not intersecting the drill path 64. Specifically, the inter-bore passage 61 is formed by a passage that flows out from the lower side of the water jacket 63 through the side (inner side) of the water jacket 63 on the exhaust side. Oil enters the inter-bore passage 61 from the cylinder head 11 side (upper side) and flows out to the exhaust side of the cylinder block 12 through the inter-bore passage 61. As the oil passes through the side of each cylinder bore 62 having a high temperature, the temperature of the oil is increased.

  According to the embodiment described above in detail, the following excellent effects can be obtained in addition to the effects of the first embodiment.

  The oil flowing out from the cylinder head 11 passes through the bore passage 61 provided between the cylinder bores 62, so that the temperature of the oil flowing out is raised. Therefore, the temperature of the oil can be further increased, and early warm-up becomes possible.

<Fourth embodiment>
In the fourth embodiment, oil can be supplied from the oil supply path to a cylinder that is at least a part of a cooling jacket provided on the side of the cylinder bore. Hereinafter, a detailed description will be given with reference to FIGS. FIG. 8 is a schematic configuration diagram of the oil circulation device S of the engine 10 in the fourth embodiment. 9 is a plan view of the cylinder block 12 (viewed from the cylinder head 11 side), and FIG. 10 is a cross-sectional view taken along the line XX in FIG. 9 and 10, the IN side is described as the intake side, and the EX side is described as the exhaust side, and arrows in the drawings indicate the flow of the fluid. Note that the control and the like in this embodiment are the same as those in the first embodiment, and a description thereof will be omitted.

  As shown in FIG. 8, part of the oil that has passed through the oil pump 32 is supplied to a cylinder passage 65 provided in the cylinder block 12. Part of the oil whose temperature has been raised in the in-cylinder passage 65 is supplied to the in-cylinder head sliding portion 13, and the rest flows into the second control valve 42. The oil that has lubricated the cylinder head sliding portion 13 from the main gallery 14 and the cylinder passage 65 flows into the third control valve 43. Since other routes and the like are the same as those in the first embodiment, description thereof will be omitted. The first temperature sensor 51 detects the temperature of the oil before the third control valve 43.

  A specific configuration of the in-cylinder passage 65 and the like will be described with reference to FIGS. 9 and 10. The cylinder block 12 is a cylinder block of the inline 4-cylinder engine 10 and has four cylinder bores 62. In the cylinder block 12, a water jacket 63 that circulates cooling water and an oil jacket 66 that circulates oil are provided around the cylinder bore 62. A water jacket 63 is provided on the exhaust side of the cylinder bore 62, while an oil jacket 66 is provided on the intake side of the cylinder bore 62. Between the water jacket 63 and the oil jacket 66, a barrier portion 67 that separates the two is provided so that the cooling water and the oil are not mixed. The oil jacket 66 is elongated in the direction in which the cylinder bores 62 are arranged. Oil is supplied to one end of the oil jacket 66 from the first path L1 and flows into the third path L3 connected to the third control valve 43 from the other end. . A part of the oil jacket 66 is supplied to the cylinder head 11 side, and oil is supplied to the cylinder head sliding portion 13.

  Between each cylinder bore 62 of the cylinder block 12, a drill path 64 is provided in which a hole communicating with the oil jacket 66 is formed by a tool such as a drill. The drill path 64 is a passage for guiding the oil in the oil jacket 66 between the cylinder bores 62. The oil jacket 66 and the drill path 64 constitute a cylinder passage 65.

  According to the embodiment described above in detail, the following excellent effects can be obtained in addition to the effects of the first embodiment.

  Oil can be supplied from an oil supply path (first path L1) to an oil jacket 66 and a drill path 64, which are at least a part of a cooling jacket provided on the side of the cylinder bore 62. The oil heated through the oil jacket 66 and the drill path 64 flows into the third path L3, so that the same effect as in the third embodiment can be obtained. In addition, by using a part of the existing cooling jacket as a passage for increasing the temperature of the oil, the design can be easily changed as compared with the case where a new inter-bore passage 61 is provided as in the third embodiment.

<Other embodiments>
The present invention is not limited to the above embodiment, and may be implemented as follows, for example. Incidentally, the configuration of another example below may be applied individually to the configuration of the above embodiment, or may be applied in any combination.

  The first switching unit may be provided at another position in the oil supply path as long as the path through the heat accumulator 21 and the path on the anti-heat accumulator side can be switched. For example, the first control valve 41 may be provided at the connection point N1 that branches from the first path L1 to the second path L2 that flows into the heat accumulator 21. In this case, when flowing out oil to the fourth path L4, the first control valve 41 may be controlled so that the oil in the fourth path L4 flows to the engine 10 side. Similarly, the second switching unit may be provided at another position on the fourth route L4 or the fifth route L5.

  The fourth path L4 may be branched upstream of the third control valve 43 in the third path L3 and connected between the first control valve 41 and the oil pump 32 in the first path L1.

  -In 3rd and 4th embodiment, you may provide the oil cooler 33 in the position of 2nd Embodiment.

  DESCRIPTION OF SYMBOLS 10 ... Engine, 11 ... Cylinder head, 12 ... Cylinder block, 20 ... Oil pan, 21 ... Heat storage device, 32 ... Oil pump, 33 ... Oil cooler, 41 ... First control valve, 42 ... Second control valve, 43 ... 3rd control valve, 50 ... control device, 61 ... passage between bores 62 ... cylinder bore, 63 ... water jacket, 65 ... passage in cylinder, L1 ... 1st route, L2 ... 2nd route, L3 ... 3rd route, L4 ... 4th path | route, L5 ... 5th path | route, N1 ... connection point, S ... oil circulation apparatus.

Claims (7)

An oil circulator for an engine in which oil stored in an oil pan (20) is circulated to an engine (10) by an oil pump (32) to lubricate sliding parts (13, 15),
An oil supply path (L1, L2) for supplying oil from the oil pan to the engine;
An oil outflow path (L3, L4, L5) for flowing oil from the engine to the oil pan or the oil supply path;
A regenerator (21) for storing oil at a higher temperature than the oil pan;
In the oil supply path, a first state is switched between a state in which the oil in the oil pan flows into the engine via the heat accumulator and a state in which the oil in the oil pan flows into the engine without going through the heat accumulator. A switching unit (41);
In the oil outflow path, a state in which the outflow oil flowing out from the engine is returned to the oil pan, a state in which the outflow oil flows into the oil supply path through the heat accumulator, and the outflow oil to the heat accumulator An engine oil circulation device comprising: a second switching unit (42, 43) that switches between a state of flowing into the oil supply path without intervention. The oil supply path is a parallel path branched into two paths, one of which is a path (L2) on the regenerator side via the heat accumulator, and the other is a path (L1) on the anti-regenerator side. ,
The engine oil circulation device according to claim 1, wherein a heat exchanger (33) for exchanging heat between the cooling water for cooling the engine and the oil is provided in a path on the side opposite to the regenerator. The oil outflow path includes a first outflow path (L3) connecting the engine and the oil pan, and a second outflow path (L4) connected from the first outflow path to the path on the anti-heat storage side. And a third outflow path (L5) connected to the heat accumulator from the first outflow path,
3. The engine oil circulation device according to claim 2, wherein the heat exchanger is provided on a downstream side of a connection point (N <b> 1) with the second outflow path in a path on the counter-heat storage side. The engine is a multi-cylinder engine;
Between each cylinder bore provided in the engine, an inter-bore passage (61) through which the spilled oil passes is provided,
The oil circulation device for an engine according to any one of claims 1 to 3, wherein oil that has passed through the inter-bore passage flows into the oil outflow path. Oil can be supplied from the oil supply path to a cylinder that is at least a part of a cooling jacket provided on the side of the cylinder bore (62) of the engine,
4. The engine oil circulation device according to claim 1, wherein oil that has passed through the cylinder flows into the oil outflow path. 5.   After starting the engine, the second switching unit causes the spilled oil to return to the oil pan, and then causes the spilled oil to flow into the oil supply path without passing through the heat accumulator. 6. The engine oil circulation device according to claim 1, wherein the engine oil circulation device is switched to a state in which the spilled oil is allowed to flow into the oil supply path via the heat accumulator. 7. A circulation control device for controlling an oil circulation device for an engine according to any one of claims 1 to 6,
After the engine is started, the first switching unit is switched to a state in which oil in the oil pan flows into the engine via the heat accumulator, and the second switching is performed to return the outflow oil to the oil pan. A first control unit for switching the unit,
A heat storage determination unit that determines whether there is high-temperature oil in the heat storage; and
When the heat storage determining unit determines that there is no high-temperature oil in the heat accumulator, the oil pan oil is removed from the state in which the oil in the oil pan flows into the engine via the heat accumulator. The first switching unit is switched to a state in which it flows into the engine without passing through the engine, and the spilled oil flows into the oil supply path without going through the heat accumulator from a state in which the spilled oil is returned to the oil pan. A second control unit that switches the second switching unit to a state;
A temperature determination unit for determining whether the temperature of the spilled oil is higher than a predetermined value;
When the temperature determination unit determines that the temperature of the spilled oil is higher than a predetermined value, the spilled oil is passed through the regenerator from a state in which the spilled oil flows into the oil supply path without passing through the regenerator. And a third control unit that switches the second switching unit to a state of flowing into the oil supply path.

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