JP2004293509A - Oil jet control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an oil jet control device capable of reducing the engine load and/or enhancing the fuel consumption while the cooling performance is well secured corresponding to the engine operating region by controlling the opening/closing motions of a solenoid valve to open and close an oil supply passage to an oil jet in which the viscosity of the lubricating oil is taken into consideration. <P>SOLUTION: The oil jet control device is structured so that its oil supply part 20 is furnished with the oil jet 10 to jet the lubricating oil from an oil supply part 20 to a piston 3 reciprocating in an engine 2 and with the solenoid valve 11 to open and close the part 9 in a position upstream of the oil jet 10, and further a temperature sensing means 15 is installed to sense the temperature of the lubricating oil or a parameter relating to it. Using a controlling means 12 to control the opening/closing motions of the solenoid valve, the oil jet control device controls the opening/closing motions of the solenoid valve in accordance with the operating condition of the engine 1, compares the sensed temperature ts with the specified temperature tw set previously, and when the temperature ts is equal to or below the specified temperature tw, jets the oil from the oil jet 10 by actuating the solenoid valve 11 in order to open the oil supply part in priority to the opening/closing control of the solenoid valve in accordance with the operating condition. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an oil jet control device that cools a piston by injecting lubricating oil into the piston.
[0002]
[Prior art]
An oil jet that injects lubricating oil to the back side of the combustion chamber of the piston is provided inside the engine to cool the piston that reciprocates in the cylinder. This oil jet is connected to a main gallery, which is an oil flow path formed in a cylinder block, and injects lubricating oil by oil pressure in the oil gallery. For this reason, it is not possible to arbitrarily change the oil injection amount, the injection timing, and the like, and it has been difficult to obtain a cooling performance according to the engine load. Therefore, in Patent Document 1, the amount of oil injection from the oil jet is controlled according to the engine load by freely changing the injection timing and cycle of the oil from the oil jet, and the cooling performance is adjusted according to the operating state of the engine. Has been proposed that allows the user to change.
In the invention described in Patent Literature 1, oil injection timing and injection period are calculated by control means using parameters such as a piston position, an engine speed, and an engine load, and an oil flow path to an oil jet is calculated by the control means. Controls the opening and closing operation of the solenoid valve that opens and closes.
[0003]
[Patent Document 1]
Japanese Utility Model Publication No. 4-26653
[Problems to be solved by the invention]
In Patent Literature 1, the injection timing and the injection period from the oil jet are appropriately controlled according to the engine load, the engine speed, and the pinton position, but the viscosity of the oil is not considered. For this reason, when the oil temperature or water temperature is low and the viscosity of the oil is high, such as when the outside air temperature is low or when the engine is started, or immediately after, the load on the oil pump or engine that sends lubricating oil to the oil gallery is large. Become. Further, since the engine speed does not rise as expected due to the viscosity of the oil, there is a concern that the accelerator opening may be increased and fuel efficiency may be reduced.
The present invention controls the opening and closing operation of a solenoid valve that opens and closes an oil supply path to an oil jet in consideration of the viscosity of lubricating oil, and achieves an improvement in fuel efficiency while achieving cooling performance corresponding to an engine operation range. It is an object to provide a jet control device.
[0005]
[Means for Solving the Problems]
To achieve the above object, according to the present invention, an oil jet for injecting a lubricating oil of an oil supply unit toward a piston reciprocating in a cylinder, and an oil flow path provided upstream of the oil jet and provided with an oil flow path In an oil jet control device including a solenoid valve that opens and closes a supply unit and a control unit that controls the opening and closing operation of the solenoid valve according to the operation state of the engine, a temperature detection unit is provided to provide a temperature of the lubricating oil or a correlation with the temperature of the lubricating oil. The temperature of the parameter is detected, and the control unit compares the temperature information output from the temperature detecting unit with a predetermined temperature set in advance. The opening and closing operation of the solenoid valve is controlled so as to open the oil flow path prior to the opening and closing control. Therefore, when the temperature of the lubricating oil or the temperature of a parameter correlated therewith is lower than the predetermined temperature, the oil supply unit is opened by the solenoid valve and the lubricating oil is injected from the oil jet.
The oil supply section is formed in a cylinder block of the engine, and one end thereof is connected to a first flow path connected to an oil pump driven by the driving force of the engine, and the other end of the first flow path is connected via a connection path. An oil jet is provided in the second flow path, and a solenoid valve is provided in the cylinder block to open and close the connection path.
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. The engine indicated by reference numeral 1 in FIG. 1 is a multi-cylinder engine, and a plurality of cylinders 2 are arranged in a row in a cylinder block 1A. FIG. 1 shows only one cylinder 2. A piston 3 is inserted into each cylinder 2 so as to be able to reciprocate within the cylinder. In the cylinder block 1A, a water jacket 4 serving as a cooling water passage is formed so as to surround each cylinder 2. Cooling water is supplied to the water jacket 4 by a water pump 15 that is rotationally driven by a driving force obtained from the engine 1 and circulates in the block. A cylinder head 1B is mounted on an upper portion of the cylinder block 1A, and a combustion chamber 30 is formed between each cylinder head 1B and each pinton 3.
[0007]
An oil jet 10 that injects lubricating oil flowing through the oil supply unit 20 toward the back surface of each piston 3 is provided in a cylinder block 1A located below one of the water jackets 4. The oil supply unit 20 includes a main gallery 5, which is formed in the cylinder block 1 </ b> A and extends in the direction in which the cylinders 2 are arranged, and serves as a first passage. And a jet channel 8 as a channel. An oil pump 7 that is rotationally driven by the drive of the engine 1 is connected to one end of the main gallery 5 via a pipe 6. The jet passage 8 is formed substantially parallel to the main gallery 5. The other end of the main gallery 5 and one end of the jet channel 8 are communicated with each other through a communication passage 9 formed in the cylinder block 1A.
[0008]
An oil pan (not shown) in which lubricating oil is stored is mounted below the cylinder block 1A. The oil pump 7 operates in conjunction with the rotation of the engine 1 to suck up the lubricating oil in the oil pan and supply the lubricating oil to the main gallery 5 by pressure. The supplied lubricating oil is supplied from the main gallery 5 to the jet flow path 8 via the communication path 9. A solenoid valve 11 that opens and closes the communication passage 9 is provided in the cylinder block 1A. The oil jet control device has a temperature sensor 15 as temperature detecting means for detecting the temperature of the cooling water, which is a parameter correlated with the temperature of the lubricating oil. In the present embodiment, the temperature sensor 15 is mounted on the cylinder block 1A, detects the temperature of the cooling water in the water jacket 4, and outputs the temperature as the temperature information ts.
[0009]
The oil jet control device includes control means 12 for controlling the opening / closing operation of the electromagnetic valve 11, an accelerator opening sensor 13 for detecting an accelerator opening θs serving as an engine load, and a crank angle sensor 14 for detecting an engine speed Ne. I have. The control means 12 is composed of a computer having a well-known CPU, memory and the like, and the electromagnetic valve 11, the accelerator opening sensor 13, the crank angle sensor 14, and the temperature sensor 15 are connected by signal lines. The control means 12 receives the accelerator opening θs information from the accelerator opening sensor 13, the engine speed Ne information from the crank angle sensor 14, and the temperature information ts from the temperature sensor 15 via each signal line. Is done.
[0010]
The control means 12 detects the operating state of the engine 1 from the accelerator opening θs information and the engine speed Ne information, and controls the operation / non-operation of the solenoid valve 11 according to the operating state, and a temperature sensor. A function is provided in which the opening and closing operation of the solenoid valve 11 is performed in preference to the opening and closing control of the solenoid valve 11 in accordance with the operating state based on the temperature information ts from 15. In the present embodiment, the operation state is determined from the accelerator opening degree θs information and the engine speed Ne information, and the basic operation of the oil jet 10 that controls the opening / closing operation of the solenoid valve 11 according to the operation state as shown in FIG. The area map is stored in the memory of the control means 12. In this memory, minimum water temperature information tw is set in advance as predetermined temperature information. In the present embodiment, the solenoid valve 11 functions so that the communication passage 9 is closed when not in operation, and the communication passage 9 is opened when in operation.
[0011]
The operation of the oil jet control device having such a configuration will be described with reference to the flowchart shown in FIG. In FIG. 3, information from each sensor is read in step S1, and the process proceeds to step S2. In step S2, it is determined whether or not the temperature information ts from the temperature sensor 15 is the minimum water temperature information tw (extremely low temperature). Here, the temperature information ts and the minimum temperature information tw are compared. As a result of the comparison, if the detected water temperature is not lower than the minimum temperature, the process proceeds to step S4. In step S4, the area of the solenoid valve 11 is determined from the accelerator opening θs information and the engine speed Ne information using the map shown in FIG. For example, when the engine speed Ne is low and the accelerator opening θs is also low load, the solenoid valve 11 does not operate because the inactive region is established, the communication passage 9 remains in the shielded state, and the oil jets 10 Oil injection to the piston 3 is stopped. When the engine speed Ne is high and the accelerator opening θs is also a high load, the operation range is set, and the solenoid valve 11 is operated to open the communication passage 9. For this reason, the lubricating oil supplied into the main gallery 5 flows from the communication passage 9 into the jet passage 8, and is jetted from each oil jet 10 to each piston 3.
[0012]
When the process proceeds to step S4 as described above, oil injection to each piston 3 is controlled according to the operating state of the engine 1, so that the cooling performance of the piston can be changed according to the operating state.
[0013]
On the other hand, in step S2, when the temperature information ts is equal to or lower than the minimum temperature information tw, that is, when the water temperature correlated with the viscosity of the oil is equal to or lower than the predetermined temperature, the process proceeds to step S3, and the electromagnetic valve 11 is opened. That is, even if the accelerator opening θs information and the engine speed Ne are input, the control of the electromagnetic valve 11 is not performed based on the information, and the control unit 12 operates the electromagnetic valve 11 based on the temperature information ts. For this reason, when the temperature is low and the viscosity of the lubricating oil is high, oil is injected from each oil jet 10, so that the oil pressure can be reduced. That is, by injecting viscous oil from each oil jet 10 when the temperature is low and the viscosity of the lubricating oil is high, the oil jet 10 functions as a hydraulic release valve, and the load on the oil pump 7 is reduced. Can be. Further, even at such a low temperature, viscous oil is injected into each piston 3, so that the oil is heated by the heat generated by the reciprocating motion of the pinton 3, and the load on the engine 1 is also reduced.
[0014]
In this embodiment, -10 degrees Celsius is set as the minimum temperature information tw. Generally, antifreeze is used for the cooling water, so that the temperature of the cooling water can be detected. In the present embodiment, the temperature of the cooling water is used as a parameter correlated to the oil viscosity. However, a control mode in which the temperature of the oil is detected and the determination is made in step S2 in FIG. The sensor for detecting the water temperature may be usually provided at the engine cooling water outlet. In this embodiment, the accelerator opening θs information is used as the load information. However, the map shown in FIG. 2 may be created using the throttle valve opening, the intake / intake air amount, the target load information, the fuel injection amount, and the like as the load information. Good.
[0015]
【The invention's effect】
According to the present invention, when the temperature of the lubricating oil or the temperature of a parameter related thereto is lower than the predetermined temperature, the oil supply unit is opened by the solenoid valve and the lubricating oil is injected from the oil jet to the piston. As a result, an increase in the oil pressure is suppressed, and the engine load can be reduced and the fuel efficiency can be improved while obtaining the cooling performance corresponding to the engine operation range.
[Brief description of the drawings]
FIG. 1 is a schematic diagram showing a configuration of an embodiment of the present invention.
FIG. 2 is a map showing a basic operation area amount of an oil jet by opening and closing an electromagnetic valve according to an operation state.
FIG. 3 is a flowchart for controlling the operation of an electromagnetic valve based on temperature information.
[Explanation of symbols]
Reference Signs List 1 engine 1A cylinder block 2 cylinder 3 piston 5 first flow path 7 oil pump 8 second flow path 9 connecting path 10 oil jet 11 solenoid valve 12 control means 15 temperature detection means 20 oil supply unit ts temperature information tw predetermined temperature

Claims (2)

An oil jet that injects lubricating oil of an oil supply unit toward a piston that reciprocates in a cylinder; and an electromagnetic valve that is provided upstream of the oil jet and that opens and closes the oil supply unit. An oil jet control apparatus comprising: the control unit that controls an opening and closing operation of the solenoid valve according to an operation state of an engine.
Having a temperature detecting means for detecting temperature information of the temperature of the lubricating oil or a parameter correlated thereto,
The control unit compares the temperature information from the temperature detection unit with a predetermined temperature set in advance, and when the temperature information is equal to or lower than the predetermined temperature, gives priority to opening / closing control of the solenoid valve according to the operation state. And controlling the operation of the solenoid valve to open the oil supply unit. The oil jet control device according to claim 1,
The oil supply unit is formed in a cylinder block of the engine, one end of which is connected to an oil pump driven by the driving force of the engine through a first flow path, and the other end of the first flow path is connected through a connection path. And a second flow path connected by
The oil jet control device, wherein the oil jet is provided in the second flow path, and the solenoid valve is provided in the cylinder block that opens and closes the connection path.

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