JP2004340066A - Internal combustion engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide engineering capable of supplying a necessary sufficient amount of an oil to a section to be lubricated in an internal combustion engine. <P>SOLUTION: This internal combustion engine comprises an oil passage; a pump for delivering the oil; an oil pan temperature sensor for detecting the temperature of the oil stored in an oil pan; a temperature sensor for the section to be lubricated for detecting the temperature of the oil near the section to be lubricated; an oil level control valve for changing an oil flowing quantity in the oil passage; an oil level controller for reducing the flowing quantity of the oil if a temperature with the temperature sensor for the section to be lubricated is higher than a temperature with the oil pan temperature sensor and the temperature with the temperature sensor for the section to be lubricated is lower than a prescribed temperature. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an internal combustion engine.
[0002]
[Prior art]
In an internal combustion engine, lubrication is performed by supplying oil to a sliding portion. Then, the oil supply amount is set based on the temperature of the sliding portion and the engine speed, and the oil supply amount to the sliding portion is set so that the set supply amount matches the detected supply amount. (For example, see Patent Literature 1) is known.
[0003]
[Patent Document 1]
Japanese Patent Application Laid-Open No. Hei 2-271010 [Patent Document 2]
JP-A-6-346717 [Patent Document 3]
JP 2001-115885 A
[Problems to be solved by the invention]
Incidentally, when the temperature of the internal combustion engine is low, for example, at the time of starting the internal combustion engine, it is desirable that the temperature of the internal combustion engine be quickly raised to complete the warm-up. However, in the lubricated part to which the oil is supplied, when a large amount of oil is supplied, the heat generated in the lubricated part is taken away by the oil, and the temperature rise is slow. On the other hand, as the temperature of the oil increases, the viscosity of the oil decreases. If the viscosity of the oil is excessively reduced, the formation of the oil film in the lubricated portion becomes insufficient, and there is a possibility that abrasion or seizure may occur. Further, the viscosity of the oil differs depending on the type of the oil.
[0005]
The present invention has been made in view of the above-described problems, and has as its object to provide a technique capable of supplying a necessary and sufficient amount of oil to a portion to be lubricated in an internal combustion engine.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, an internal combustion engine of the present invention employs the following solutions. That is, the first invention is:
An internal combustion engine having an oil pan storing oil and a lubricated part lubricated by the oil,
An oil passage connected to the lubricated part and through which oil flows,
A pump for discharging oil into the oil passage;
An oil pan temperature sensor that detects the temperature of oil stored in the oil pan,
A lubricated part temperature sensor for detecting a temperature of oil near the lubricated part;
An oil amount control valve that changes a passage area of the oil passage to change an oil flow amount;
The oil temperature detected by the lubricated part temperature sensor is higher than the oil temperature detected by the oil pan temperature sensor, and the oil temperature detected by the lubricated part temperature sensor is higher than a prescribed temperature. Is also low, an oil amount control device that reduces the passage area of the oil passage by the oil amount control valve to reduce the amount of oil flow,
It is characterized by having.
[0007]
The greatest feature of the present invention is to determine whether or not the supply amount of the oil to the lubricated part is sufficient based on the oil temperature of the oil pan and the part to be lubricated, and to determine the amount of oil supply to the lubricated part. The point is to control.
[0008]
In the internal combustion engine configured as described above, oil pumped from the oil pan by the pump is supplied to the lubricated portion via the oil passage. In this lubricated part, the temperature of the lubricated part and the oil increases due to frictional heat. However, if the amount of oil supplied to the lubricated portion is large, the generated frictional heat is taken away by the oil. Therefore, the temperature of the lubricated portion slowly rises. In this regard, when the amount of oil flowing through the oil passage is reduced by the oil amount adjusting valve, the amount of oil supplied to the lubricated portion can be reduced, and the temperature of the lubricated portion can be increased. It becomes. Here, the oil circulation amount is reduced only when the oil temperature detected by the lubricated portion temperature sensor is lower than a prescribed temperature. This “prescribed temperature” is a temperature at which wear or seizure of the lubricated portion may occur. This makes it possible to increase the temperature of the lubricated part while suppressing the occurrence of wear or seizure on the lubricated part. Further, since the temperature of the oil and the lubricated portion is increased, the friction loss in the lubricated portion can be reduced.
[0009]
In this manner, the temperature of the lubricated portion and the oil can be quickly increased while supplying the necessary amount of oil to suppress the wear or seizure of the lubricated portion, and early warm-up and reduction of friction loss can be achieved. Reduction can be performed.
[0010]
In order to achieve the above object, an internal combustion engine of the present invention employs the following solutions. That is, the second invention is
An internal combustion engine having an oil pan storing oil and a lubricated part lubricated by the oil,
An oil passage connected to the lubricated part and through which oil flows,
A pump for discharging oil into the oil passage;
A lubricated part temperature sensor for detecting a temperature of oil near the lubricated part;
An oil amount control valve that reduces a passage area of the oil passage to change an oil flow amount;
An oil viscosity detector that detects the viscosity of the oil,
When the oil temperature detected by the lubricated part temperature sensor is lower than a predetermined temperature, and the oil viscosity detected by the oil viscosity detection device is lower than a predetermined viscosity, the oil amount control is performed. An oil amount control device that increases the passage amount of oil by increasing the passage area of the oil passage by a valve;
It is characterized by having.
[0011]
The greatest feature of the present invention is that the oil viscosity is detected by an oil viscosity detecting device, and when the viscosity is such that abrasion or seizure of the lubricated portion may occur, the amount of oil supplied to the lubricated portion is increased. This is to suppress wear and seizure of the lubricated portion.
[0012]
Here, the viscosity of the oil decreases as the temperature of the oil increases, which is disadvantageous in that an oil film is formed. However, even when the viscosity of the oil is low, an oil film can be formed by increasing the supply amount of the oil.
[0013]
Therefore, when the oil temperature detected by the lubricated part temperature sensor is lower than a specified temperature and the oil viscosity detected by the oil viscosity detection device is lower than a specified viscosity, the oil amount The controller increases the oil flow. Accordingly, even when the viscosity of the oil is reduced, an oil film can be formed on the lubricated portion, and wear and seizure of the lubricated portion can be suppressed. Here, the “prescribed temperature” is a temperature at which abrasion or seizure of the lubricated portion may occur. Further, the “specified viscosity” is represented by a viscosity at which abrasion or seizure of the lubricated portion may occur. Since there is a close relationship between the oil temperature and the viscosity, it is desirable to determine the “specified temperature” and the “specified viscosity” in consideration of the relationship between the two.
[0014]
In the first invention, a cooling water temperature sensor for detecting a temperature of cooling water of the internal combustion engine;
An oil viscosity detector that detects the viscosity of the oil,
Fuel supply amount determining means for determining a fuel supply amount to the internal combustion engine based on the temperature of the cooling water detected by the cooling water temperature sensor and the viscosity of the oil detected by the oil viscosity detecting device;
Can be provided.
[0015]
Further, in the second invention, a cooling water temperature sensor for detecting a temperature of cooling water of the internal combustion engine,
Fuel supply amount determining means for determining a fuel supply amount to the internal combustion engine based on the temperature of the cooling water detected by the cooling water temperature sensor and the viscosity of the oil detected by the oil viscosity detecting device;
Can be provided.
[0016]
The oil used for lubrication in the internal combustion engine is exchanged when a specified traveling distance or a specified period has elapsed since the oil is exposed to heat of the internal combustion engine or deteriorates over time. Here, there are a plurality of types of oils having different viscosities, and the user does not always use the same oil. When the oil is replaced with oil having a different viscosity, the load on the internal combustion engine changes. That is, the load on the internal combustion engine increases when oil having a high viscosity is used, and the load on the internal combustion engine decreases when oil having a low viscosity is used. When the load of the internal combustion engine differs, the fuel consumption of the internal combustion engine also differs. In this regard, by changing the fuel supply according to the change in the load, it becomes possible to supply an appropriate amount of fuel. That is, since the load on the internal combustion engine changes due to the change in the viscosity of the oil, it is possible to supply an appropriate amount of fuel by changing the fuel supply amount to the internal combustion engine based on the oil viscosity.
[0017]
Further, the fuel supply amount determining means can increase the fuel supply amount to the internal combustion engine as the cooling water temperature decreases, and decrease the fuel supply amount as the oil viscosity decreases. Here, when the engine is started and the coolant temperature is low, the amount of fuel is generally increased in order to improve the startability. However, when low-viscosity oil is used, the load on the internal combustion engine is reduced, so that the amount of fuel supplied to the internal combustion engine can be reduced.
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
<First embodiment>
Hereinafter, specific embodiments of the internal combustion engine according to the present invention will be described with reference to the drawings. Here, a case in which the internal combustion engine according to the present invention is applied to a diesel engine for driving a vehicle will be described as an example.
[0019]
FIG. 1 is a schematic configuration diagram showing an internal structure of an engine 1 according to the present embodiment. 1A is an overall view, and FIG. 1B is an enlarged view of a portion where the crankshaft 3 is supported.
[0020]
The engine 1 shown in FIG. 1 is a four-cycle engine. The outer shell of the engine 1 includes a cylinder head 1a, a cylinder block 1b connected to a lower portion of the cylinder head 1a, and an oil pan 1c connected to a lower portion of the cylinder block 1b.
[0021]
The cylinder block 1b includes a piston 2 and a crankshaft 3 that perform reciprocating motion. The piston 2 is connected to one end of a connecting rod 4 via a piston pin (not shown), and the other end of the connecting rod 4 is connected to the crankshaft 3.
[0022]
The crankshaft 3 includes a crank journal 3a. The crankshaft 3 is supported by a cylinder block 1b at a crank journal 3a. A metal bearing 5 is interposed between the crank journal 3a and the cylinder block 1b.
[0023]
On the other hand, the cylinder block 1b is provided with an oil pump 6 that discharges an amount of oil according to the number of revolutions of the crankshaft 3. An oil passage 7 is connected to the oil pump 6. One end of the oil passage 7 is opened in the oil stored in the oil pan 1c. On the other hand, the other end of the oil passage 7 is connected to a lubricated portion such as the crank journal 3a. Then, the oil stored in the oil pan 1c is pumped up by the oil pump 6 and supplied to the lubricated portion via the oil passage 7. As a result, the lubricated portion is lubricated.
[0024]
Here, an oil amount control valve 8 is provided in the middle of the oil passage 7 communicating with the crank journal 3a, the oil amount control valve 8 being capable of adjusting the oil flow by opening and closing. When the oil amount control valve 8 is controlled to be closed, the amount of oil supplied to the crank journal 3a decreases, and the amount of oil supplied to other lubricated parts increases. On the other hand, when the oil amount control valve 8 is controlled to open, the amount of oil supplied to the crank journal 3a increases, and the amount of oil supplied to other lubricated parts decreases.
[0025]
The cylinder block 1b is provided with a lubricated part temperature sensor 9 for measuring the temperature of oil between the crank journal 3a and the cylinder block 1b. Further, the oil pan 1c is provided with an oil pan temperature sensor 10 for measuring the temperature of the oil stored in the oil pan 1c.
[0026]
Further, the engine 1 is provided with a crank position sensor 11 that outputs an electric signal corresponding to the rotational position of the crankshaft and a water temperature sensor 12 that outputs an electric signal corresponding to the temperature of the cooling water of the engine 1.
[0027]
The engine 1 configured as described above is provided with an electronic control unit (ECU: Electronic Control Unit) 13 for controlling the engine 1. The ECU 13 is a unit that controls the operating state of the engine 1 in accordance with the operating conditions of the engine 1 and a driver's request.
[0028]
Various sensors are connected to the ECU 13 via electric wiring. In addition to the output signals of the various sensors described above, an output signal of an accelerator opening sensor 14 that outputs an electric signal corresponding to the amount of depression of the accelerator pedal by the driver is output. Is entered.
[0029]
By the way, at the time of cold start, heat is generated in the crank journal 3a due to friction between the crank journal 3a and oil, and the temperature of the crank journal 3a rises. However, if the amount of oil supplied to the crank journal 3a is large, the heat generated by friction is taken away by the oil, and the temperature rise of the oil journal 3a becomes slow. Therefore, it takes time to warm up the engine 1.
[0030]
In this regard, in the present embodiment, the amount of oil supplied to the crank journal 3a based on the oil temperature measured by the lubricated portion temperature sensor 9 and the oil temperature measured by the oil pan temperature sensor 10. Is determined to be an appropriate amount, and the oil amount control valve 8 is controlled based on the determination result. That is, the minimum necessary oil is supplied to the crank journal 3a, and the temperature of the crank journal 3a can be quickly increased.
[0031]
Next, a flow of the oil amount control according to the present embodiment will be described.
[0032]
FIG. 2 is a flowchart illustrating a flow of the oil amount control according to the present embodiment.
[0033]
In step S101, the oil temperature Toc measured by the lubricated portion temperature sensor 9 (hereinafter referred to as lubricated portion oil temperature Toc), and the oil temperature Too measured by the oil pan temperature sensor 10 (hereinafter referred to as oil pan oil temperature Too). ), The water temperature Tw measured by the water temperature sensor 12 is read.
[0034]
In step S102, it is determined whether or not the water temperature Tw is equal to or lower than the water temperature after completion of warming up (for example, 80 ° C.). Here, if the warm-up is completed, it is not necessary to perform the oil amount control according to the present embodiment.
[0035]
If an affirmative determination is made in step S102, the process proceeds to step S103, while if a negative determination is made, the process proceeds to step S107.
[0036]
In step S103, it is determined whether or not the lubricated portion oil temperature Toc is higher than the oil pan oil temperature Too. Here, the lubricated member other than the crank journal 3a raises the temperature of the oil, and the heat generated by the combustion of the fuel is transmitted to the oil, so that the temperature of the oil also increases. May be lower than the oil pan oil temperature Too. In such a case, since the temperature of the crank journal 3a can be increased by the temperature of the oil stored in the oil pan 1c, the control of the oil amount control valve 8 to the closing side is not performed.
[0037]
If an affirmative determination is made in step S103, the process proceeds to step S104, while if a negative determination is made, the process proceeds to step S107.
[0038]
In step S104, it is determined whether or not the lubricated portion oil temperature Toc is lower than a prescribed temperature. Here, the "prescribed temperature" is the upper limit of the oil temperature at which there is no risk of wear or seizure of the crank journal 3a. If the temperature is higher than the specified temperature, wear or seizure may occur, so the amount of oil is increased. When the temperature is lower than the specified temperature, the amount of oil can be further reduced.
[0039]
If an affirmative determination is made in step S104, the process proceeds to step S105, while if a negative determination is made, the process proceeds to step S107.
[0040]
In step S105, it is determined whether or not the engine speed N is lower than a specified speed. Here, the "predetermined rotational speed" is the upper limit of the engine rotational speed N at which there is no risk of wear or seizure of the crank journal 3a. That is, if the supply amount of the oil to the crank journal 3a is reduced when the engine speed is high, there is a possibility that the oil film is broken and the crank journal 3a is worn or seized. Therefore, when the engine speed N is high, the supply amount of oil is increased. The engine speed N can be obtained from an output signal from the crank position sensor 11.
[0041]
If an affirmative determination is made in step S105, the process proceeds to step S106, while if a negative determination is made, the process proceeds to step S107.
[0042]
In step S106, the amount of oil supplied to the crank journal 3a is reduced by controlling the oil amount control valve 8 to the closing side.
[0043]
In step S107, the amount of oil supplied to the crank journal 3a is increased by controlling the oil amount control valve 8 to the open side.
[0044]
In this manner, the amount of oil supplied to the crank journal 3a can be minimized based on the temperature Toc of the oil near the crank journal 3a and the temperature Too of the oil stored in the oil pan 1c, Warm-up of the crank journal 3a can be completed promptly. Thereby, emission performance can be improved. Further, the viscosity of the oil decreases because the temperature of the oil increases in the crank journal 3a, so that the friction loss can be reduced.
[0045]
In this embodiment, the amount of oil supplied to the crank journal 3a is controlled. However, instead of this, the amount of oil supplied to other engine members is controlled to warm the engine members. The machine may be completed promptly.
[0046]
<Second embodiment>
The present embodiment is different from the first embodiment in that the opening of the oil amount control valve 8 is controlled in consideration of the oil viscosity. The present embodiment is different in that an oil viscosity sensor 15 for measuring the viscosity of oil is provided. Note that the basic configuration of the engine and other hardware to be applied is the same as in the first embodiment, and a description thereof will be omitted.
[0047]
The oil viscosity sensor 15 is attached to the oil pan 1c as shown in FIG. 1, and outputs an electric signal according to the viscosity of the oil stored in the oil pan 1c. Here, the viscosity of the oil changes depending on the temperature of the oil. If the viscosity of the oil is too low, each member of the engine 1 may be worn or seized.
[0048]
Therefore, in the present embodiment, the amount of oil supplied to the oil journal 3a is reduced as much as possible while ensuring the minimum necessary viscosity, and the temperature around the oil journal 3a is quickly increased.
[0049]
FIG. 3 is a flowchart illustrating a flow of the oil amount control according to the present embodiment.
[0050]
In step S201, the oil temperature Toc, the water temperature Tw, and the oil viscosity V measured by the oil viscosity sensor 15 are read.
[0051]
In step S202, it is determined whether or not the water temperature Tw is equal to or higher than the water temperature after completion of warming up (for example, 80 ° C.). Here, if the warming-up is not completed, it is not necessary to perform the oil amount control according to the present embodiment, so that the oil amount control valve 8 has a normal opening. Here, the normal opening is the opening of the oil amount control valve 8 set after the completion of warm-up.
[0052]
If an affirmative determination is made in step S202, the process proceeds to step S203, while if a negative determination is made, the process proceeds to step S206.
[0053]
In step S203, it is determined whether or not the oil viscosity V is equal to or less than a specified viscosity. Here, the “specified viscosity” is an oil viscosity at which there is a possibility that the crank journal 3a will be worn or seized. If the viscosity is lower than the specified value, the crank journal 3a may be worn or seized. Therefore, the amount of oil supplied to the crank journal 3a is increased to suppress this.
[0054]
If an affirmative determination is made in step S203, the process proceeds to step S204, while if a negative determination is made, the process proceeds to step S206.
[0055]
In step S204, it is determined whether or not the lubricated portion oil temperature Toc is higher than a prescribed temperature. Here, the "prescribed temperature" is the upper limit of the oil temperature at which there is no risk of wear or seizure of the crank journal 3a. If the temperature is higher than the prescribed temperature, wear or seizure may occur, so it is necessary to increase the amount of oil supplied to the crank journal 3a. When the temperature is lower than the specified temperature, the supply amount of oil to the crank journal 3a can be further reduced.
[0056]
If an affirmative determination is made in step S204, the process proceeds to step S205, while if a negative determination is made, the process proceeds to step S206.
[0057]
In step S205, the amount of oil supplied to the crank journal 3a is increased more than usual by controlling the oil amount control valve 8 to be more open than usual.
[0058]
In step S206, the oil amount control valve 8 is maintained at the normal opening.
[0059]
In this way, when the viscosity of the oil decreases, the amount of oil supplied to the crank journal 3a can be increased, and wear or seizure of the crank journal 3a can be suppressed.
[0060]
In the present embodiment, the amount of oil supplied to the crank journal 3a is controlled. However, instead of this, the amount of oil supplied to other engine members is controlled so that the engine members are worn. Alternatively, burn-in may be suppressed.
[0061]
Further, in the present embodiment, the case where the viscosity of the oil decreases due to the temperature rise of the oil has been described, but instead, the case where the viscosity of the oil replaced by the user is lower than the viscosity of the oil before the replacement is Can also be applied. That is, when the oil is changed to a low-viscosity oil, the oil amount control valve 8 may be controlled to the open side to suppress wear or seizure of the crank journal 3a.
[0062]
<Third embodiment>
The present embodiment is different from the first and second embodiments in that the amount of fuel supplied to the engine 1 is controlled in consideration of the oil viscosity. Note that the basic configuration of the engine and other hardware to be applied is the same as in the second embodiment, and a description thereof will be omitted.
[0063]
The engine 1 includes a fuel injection valve 17 that injects fuel directly into the combustion chamber 16 as shown in FIG.
[0064]
Here, in the present embodiment, the amount of fuel injected from the fuel injection valve 17, the engine speed N (the output signal from the crank position sensor 11), and the engine load Q (the output signal from the accelerator opening sensor 14) Is determined in advance through experiments or the like and mapped. Then, the reference fuel injection amount can be obtained by substituting the engine speed N and the engine load Q into the map.
[0065]
By the way, the lower the oil temperature, the lower the oil viscosity, and the lower the engine load, the lower the oil viscosity. As described above, the viscosity of the oil differs depending on the type of the oil. Therefore, the engine load differs depending on the type of oil used by the user.
[0066]
On the other hand, generally, at the time of the cold start of the engine 1, the fuel injection amount is increased in order to improve the startability. In this case, when the user uses low-viscosity oil, the load on the engine 1 is small, so that the rotation speed of the engine 1 increases as compared with the case where high-viscosity oil is used. As a result, the idle speed of the engine 1 may fluctuate. Further, there is a possibility that harmful substances may be discharged by supplying more fuel than necessary.
[0067]
In this regard, in the present embodiment, the fuel injection amount is changed based on the viscosity of the oil. That is, the lower the oil viscosity, the smaller the degree of increase in the fuel injection amount at the time of starting, while the higher the oil viscosity, the greater the degree of increase.
[0068]
FIG. 4 is a flowchart illustrating a flow for calculating the fuel injection amount according to the present embodiment.
[0069]
In step S301, it is determined whether the engine 1 has been started.
[0070]
If an affirmative determination is made in step S301, the process proceeds to step S302, while if a negative determination is made, the process proceeds to step S305.
[0071]
In step S302, the water temperature Tw and the oil viscosity V are read.
[0072]
In step S303, the fuel injection amount B at the time of starting is calculated from the water temperature Tw. The fuel injection amount B at the time of the start is the fuel injection amount at the time of the cold start which is usually performed, and is increased with respect to the fuel injection amount after the warm-up. The relationship between the fuel injection amount B at the time of starting and the water temperature Tw is obtained in advance through experiments or the like and mapped. Then, by substituting the water temperature Tw into the map, the fuel injection amount B at the time of starting can be obtained.
[0073]
In step S304, a correction coefficient A for the fuel injection amount B is calculated from the water temperature Tw and the oil viscosity V read in step S302. The correction coefficient A is calculated by substituting the water temperature Tw and the oil viscosity V into a map obtained by previously obtaining the relationship between the correction coefficient A and the water temperature Tw and the oil viscosity V through experiments or the like. The correction coefficient A is 1 when the correction of the fuel injection amount B is not required. When the fuel injection amount B is increased, the value becomes larger than 1, and when it is decreased, the value becomes larger than 0 and smaller than 1.
[0074]
In step S305, a value obtained by multiplying the injection amount B at the start by the correction coefficient A is set as a new fuel injection amount B at the start.
[0075]
In this manner, the lower the oil viscosity V, the smaller the fuel injection amount at startup, that is, the smaller the degree of increase in the fuel injection amount at startup. As a result, fuel injection according to the engine load becomes possible, and the idling speed can be stabilized. Furthermore, emission of harmful substances can be suppressed.
[0076]
Note that, in the present embodiment, an application example of the fuel injection amount at the time of starting has been described. Instead, the present invention may be applied to control of the fuel injection amount after warm-up.
[0077]
【The invention's effect】
In the internal combustion engine according to the present invention, the minimum necessary oil can be supplied based on the temperature of the oil supplied to the lubricated part, and the warm-up is completed quickly while suppressing the wear or seizure of the lubricated part. Can be done.
[0078]
Further, in the internal combustion engine according to the present invention, when the oil viscosity is low and the lubricating member may be seized, the amount of oil supplied to the lubricated part can be increased to suppress the seizure of the lubricated part.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram showing an internal structure of an engine according to the present embodiment. 1A is an overall view, and FIG. 1B is an enlarged view of a portion where a crankshaft is supported.
FIG. 2 is a flowchart illustrating a flow of an oil amount control according to the first embodiment.
FIG. 3 is a flowchart illustrating a flow of oil amount control according to a second embodiment.
FIG. 4 is a flowchart illustrating a flow for calculating a fuel injection amount according to a third embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Engine 1a Cylinder head 1b Cylinder block 1c Oil pan 2 Piston 3 Crank shaft 3a Crank journal 4 Connecting rod 5 Metal bearing 6 Oil pump 7 Oil passage 8 Oil flow control valve 9 Lubricated part temperature sensor 10 Oil pan temperature sensor 11 Crank position Sensor 12 Water temperature sensor 13 ECU
14 Accelerator opening sensor 15 Oil viscosity sensor 16 Combustion chamber 17 Fuel injection valve

Claims (5)

An internal combustion engine having an oil pan storing oil and a lubricated part lubricated by the oil,
An oil passage connected to the lubricated part and through which oil flows,
A pump for discharging oil into the oil passage;
An oil pan temperature sensor that detects the temperature of oil stored in the oil pan,
A lubricated part temperature sensor for detecting a temperature of oil near the lubricated part;
An oil amount control valve that changes a passage area of the oil passage to change an oil flow amount;
The oil temperature detected by the lubricated part temperature sensor is higher than the oil temperature detected by the oil pan temperature sensor, and the oil temperature detected by the lubricated part temperature sensor is higher than a prescribed temperature. Is also low, an oil amount control device that reduces the passage area of the oil passage by the oil amount control valve to reduce the amount of oil flow,
An internal combustion engine comprising: A cooling water temperature sensor that detects a temperature of cooling water of the internal combustion engine;
An oil viscosity detector that detects the viscosity of the oil,
Fuel supply amount determining means for determining a fuel supply amount to the internal combustion engine based on the temperature of the cooling water detected by the cooling water temperature sensor and the viscosity of the oil detected by the oil viscosity detecting device;
The internal combustion engine according to claim 1, further comprising: An internal combustion engine having an oil pan storing oil and a lubricated part lubricated by the oil,
An oil passage connected to the lubricated part and through which oil flows,
A pump for discharging oil into the oil passage;
A lubricated part temperature sensor for detecting a temperature of oil near the lubricated part;
An oil amount control valve that reduces a passage area of the oil passage to change an oil flow amount;
An oil viscosity detector that detects the viscosity of the oil,
When the oil temperature detected by the lubricated part temperature sensor is lower than a predetermined temperature, and the oil viscosity detected by the oil viscosity detection device is lower than a predetermined viscosity, the oil amount control is performed. An oil amount control device that increases the passage amount of oil by increasing the passage area of the oil passage by a valve;
An internal combustion engine comprising: A cooling water temperature sensor that detects a temperature of cooling water of the internal combustion engine;
Fuel supply amount determining means for determining a fuel supply amount to the internal combustion engine based on the temperature of the cooling water detected by the cooling water temperature sensor and the viscosity of the oil detected by the oil viscosity detecting device;
The internal combustion engine according to claim 3, further comprising: 5. The fuel supply amount determining unit according to claim 2, wherein the fuel supply amount is increased as the cooling water temperature is lower, and the degree of increase in the fuel supply amount is reduced as the oil viscosity is lower. 6. Internal combustion engine.

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