JP5293295B2 - Internal combustion engine lubrication system - Google Patents

Description

  The present invention relates to a lubrication system for an internal combustion engine.

  Conventionally, as a lubrication system for an internal combustion engine, a lubrication system that stops oil supply to a piston by an oil jet during warm-up is known. For example, Patent Document 1 discloses a technique for stopping oil supply by an oil jet until the catalyst activity (that is, during warm-up).

JP-A-6-42346

  By stopping the oil supply by the oil jet at the time of warming up, the temperature of the piston can be raised quickly. However, when the oil supply by the oil jet is stopped at the time of warm-up, the heat reception of the oil is suppressed, so that it is difficult to raise the temperature of the oil early.

  The present invention provides a lubrication system for an internal combustion engine that can quickly raise the temperature of a piston and oil.

An internal combustion engine lubrication system according to the present invention is supplied to an operation information acquisition unit that acquires information related to an operation state of the internal combustion engine, an oil jet unit that supplies oil to a piston of the internal combustion engine, and the oil jet unit. Heating means for heating oil with the exhaust of the internal combustion engine, and control means for controlling the operation of the heating means and controlling the operation of the oil jet means based on the acquisition result of the operation information acquisition means. The operation information acquisition means includes piston temperature information acquisition means for acquiring information for determining the temperature of the piston among the information relating to the operation state of the internal combustion engine, and the information among the information relating to the operation state of the internal combustion engine. Oil temperature information acquisition means for acquiring information for determining the temperature of oil supplied to the oil jet means; Said control means, characterized in that on the basis of the piston temperature information acquiring means acquires the result to control the operation of the oil jet means, for controlling the operation of said heating means on the basis of the obtained result of the oil temperature information acquiring means It is what.

According to the lubrication system for an internal combustion engine according to the present invention, the temperature of the piston can be raised quickly by stopping the oil supply by the oil jet means. Moreover, oil can be heated up early by performing the heating by a heating means. Moreover, according to this structure, a piston can be heated up by stopping the oil supply of an oil jet based on the acquisition result of a piston temperature information acquisition means. Further, the oil can be heated by executing the heating of the oil by the heating means based on the acquisition result of the oil temperature information acquisition means. As a result, the temperature of the piston and the temperature of the oil can be appropriately increased.

The above configuration includes an exhaust gas recirculation path for returning a part of the exhaust gas of the internal combustion engine to intake air, and the heating means generates heat between the exhaust gas in the exhaust gas recirculation path and the oil supplied to the oil jet means. You may have the EGR cooler which performs exchange.

According to this configuration, part of the exhaust gas can be returned to the intake air, so that an EGR effect can be obtained.

In the above configuration, the control means controls the oil jet means so that the supply of oil to the piston is stopped when the temperature of the piston, which is an acquisition result of the piston temperature information acquisition means, is a predetermined value or less. And the oil supplied to the oil jet means when the temperature of the refrigerant of the internal combustion engine or the temperature of the oil supplied to the oil jet means, which is the acquisition result of the oil temperature information acquisition means, is below a predetermined value. The heating means may be controlled so as to be heated by the exhaust gas of the internal combustion engine.

According to this configuration, the temperature of the piston and the temperature of the oil can be appropriately increased.

  ADVANTAGE OF THE INVENTION According to this invention, the lubrication system of the internal combustion engine which can heat up a piston and oil early can be provided.

FIG. 1 is a schematic diagram illustrating a configuration of a lubrication system for an internal combustion engine according to a first embodiment. FIG. 2 is a schematic diagram illustrating a configuration of a lubrication system for an internal combustion engine according to the second embodiment.

  Hereinafter, modes for carrying out the present invention will be described.

  An internal combustion engine lubrication system 100 according to Embodiment 1 of the present invention will be described. FIG. 1 is a schematic diagram showing the configuration of the lubrication system 100. The lubrication system 100 mainly includes an internal combustion engine (engine) 10, various paths (an intake path 20, an exhaust path 21, an exhaust recirculation path 22, an oil path 23, and a refrigerant path 24), a temperature sensor 30, and an oil jet device. 40 (O / J), a first EGR cooler 50, a second EGR cooler 51, an EGR valve 60, a three-way valve 61, and an ECU 70.

  The intake path 20 is a path for guiding intake air to the intake port of the internal combustion engine 10. The exhaust path 21 is a path for discharging the exhaust discharged from the exhaust port of the internal combustion engine 10 to the outside of the lubrication system 100. The exhaust gas recirculation path 22 is connected to the midway of the exhaust path 21 and the midway of the intake path 20, and is a path for guiding a part of the exhaust flowing through the exhaust path 21 to the intake path 20. A part of the exhaust gas that is returned to the intake path 20 (that is, the exhaust gas in the exhaust gas recirculation path 22) is referred to as EGR gas.

  The oil path 23 is a path through which oil circulating between the oil jet device 40 and the second EGR cooler 51 flows. The refrigerant path 24 is a path through which a refrigerant (for example, water) circulating between the internal combustion engine 10 and the first EGR cooler 50 flows.

  The temperature sensor 30 acquires the temperature of the refrigerant circulating between the internal combustion engine 10 and the first EGR cooler 50 and transmits the acquisition result to the ECU 70. The temperature of the refrigerant changes according to the operating state of the internal combustion engine 10. The temperature sensor 30 functions as an operation information acquisition unit that acquires information regarding the operation state of the internal combustion engine 10. Moreover, the temperature of the refrigerant has a correlation with the temperature of the oil. Therefore, the temperature sensor 30 functions as an oil temperature information acquisition unit that acquires information for determining the temperature of the oil. The temperature sensor 30 is not limited as long as it is a means for acquiring information that can determine the temperature of the oil. For example, instead of the temperature sensor 30 that acquires the temperature of the refrigerant, a temperature sensor that directly acquires the temperature of the oil may be used.

  The oil jet device 40 is a device that receives oil from the oil passage 23 to the piston of the internal combustion engine 10 in response to an instruction from the ECU 70. That is, the oil jet device 40 functions as an oil jet means for supplying oil to the piston of the internal combustion engine 10. When the oil is supplied from the oil jet device 40, the piston is cooled. The oil supply location to the piston of the oil jet device 40 is not particularly limited as long as the piston can be cooled by supplying oil. In the present embodiment, the oil jet device 40 injects oil toward the lower surface side (crank side) of the piston.

  The first EGR cooler 50 is a device that performs heat exchange between the exhaust gas (that is, EGR gas) in the exhaust gas recirculation path 22 and the refrigerant in the refrigerant path 24. In the first EGR cooler 50, the EGR gas is cooled by the refrigerant.

  The second EGR cooler 51 is a device that exchanges heat between the EGR gas and the oil in the oil passage 23. In the second EGR cooler 51, the oil in the oil passage 23 is heated by the EGR gas.

  The EGR valve 60 is disposed downstream of the first EGR cooler 50 and the second EGR cooler 51 in the exhaust gas recirculation path 22. The EGR valve 60 is a valve that opens and closes in response to an instruction from the ECU 70. When the EGR valve 60 is open, the first EGR cooler 50, the second EGR cooler 51, and the intake passage 20 are in communication.

  The three-way valve 61 is disposed upstream of the first EGR cooler 50 and the second EGR cooler 51 in the exhaust gas recirculation path 22. The three-way valve 61 receives an instruction from the ECU 70 and causes the EGR gas to flow into one of the first EGR cooler 50 and the second EGR cooler 51. When the three-way valve 61 causes the EGR gas to flow into the second EGR cooler 51 and the EGR valve 60 is opened, heat exchange is performed between the oil in the oil path 23 and the EGR gas in the second EGR cooler 51. That is, the second EGR cooler 51, the EGR valve 60, and the three-way valve 61 function as a heating unit that heats the oil supplied to the oil jet device 40 with the exhaust gas of the internal combustion engine 10. On the other hand, when the three-way valve 61 allows the EGR gas to flow into the first EGR cooler 50 and the EGR valve 60 is opened, heat exchange is performed between the refrigerant in the refrigerant path 24 and the EGR gas in the first EGR cooler 50.

  The ECU 70 is a microcomputer having a CPU 71, a ROM 72 and a RAM 73. The ECU 70 has a map of the fuel injection amount. The ECU 70 estimates the piston temperature based on the fuel injection amount. That is, the ECU 70 functions as a piston temperature information acquisition unit that acquires information for determining the temperature of the piston. Note that the ECU 70 may determine the temperature of the piston, for example, based on the accelerator opening acquired by the accelerator opening sensor. In this case, the accelerator opening sensor corresponds to piston temperature information acquisition means.

  Further, the ECU 70 functions as a control unit that controls the operation of the oil jet device 40 and the operation of the heating unit based on the temperature of the piston estimated and calculated based on the fuel injection amount and the acquisition result of the temperature sensor 30. To do. Specifically, the ECU 70 controls the oil jet device 40 so that the oil supply by the oil jet device 40 is executed or stopped based on the estimated temperature of the piston. More specifically, the ECU 70 controls the oil jet device 40 so that oil supply to the piston is stopped when the estimated temperature of the piston is equal to or lower than a predetermined value. In this case, since the cooling of the piston with oil is stopped, the temperature of the piston can be raised quickly. On the other hand, when the estimated temperature of the piston is not equal to or lower than the predetermined value, the ECU 70 controls the oil jet device 40 so that oil supply is executed. In this case, the piston is cooled by oil.

  Further, the ECU 70 controls the three-way valve 61 and the EGR valve 60 based on the acquisition result of the temperature sensor 30. More specifically, the ECU 70 sets the three-way valve 61 so that the EGR gas flows into the second EGR cooler 51 when the acquisition result of the temperature sensor 30 is equal to or lower than a predetermined temperature (for example, about 80 degrees) that requires warm-up. And the EGR valve 60 is controlled to be opened. In this case, in the second EGR cooler 51, the oil is heated by the EGR gas. Thereby, oil can be heated up early. The EGR gas that has passed through the second EGR cooler 51 flows into the intake path 20. Thereby, the EGR effect can be obtained.

  On the other hand, the ECU 70 controls the three-way valve 61 so that EGR gas flows into the first EGR cooler 50 because warm-up is not required when the acquisition result of the temperature sensor 30 is not below the predetermined temperature. In this case, the oil heating in the second EGR cooler 51 is stopped. Note that when EGR gas flows into the first EGR cooler 50 and the EGR valve 60 is further controlled to open, the EGR gas cooled by the first EGR cooler 50 flows into the intake passage 20. Thereby, the EGR effect is obtained.

  The ECU 70 may control the oil jet device 40, the three-way valve 61, and the EGR valve 60 based on any one of the temperature of the piston and the result obtained by the temperature sensor 30. For example, the ECU 70 controls the oil jet device 40 so that the oil supply is stopped and the oil heating in the second EGR cooler 51 is executed when the acquisition result of the temperature sensor 30 is equal to or lower than a predetermined temperature. And the EGR valve 60 may be controlled. Also in this case, execution and stop of oil supply by the oil jet device 40 and execution and stop of oil heating by the EGR gas can be performed according to the operating state of the internal combustion engine 10. Thereby, the temperature of the piston and the oil can be raised quickly. However, as in this embodiment, the ECU 70 controls the oil jet device 40 based on the temperature of the piston, and controls the three-way valve 61 and the EGR valve 60 based on the acquisition result of the temperature sensor 30. And it is preferable in that the temperature of the oil can be raised more appropriately.

  Next, an internal combustion engine lubrication system 100a according to Embodiment 2 of the present invention will be described. FIG. 2 is a schematic diagram showing the configuration of the lubrication system 100a. The lubrication system 100a does not include the EGR mechanism (the first EGR cooler 50, the second EGR cooler 51, the refrigerant path 24, the exhaust gas recirculation path 22, the EGR valve 60, and the three-way valve 61). Different. The lubrication system 100a is different from the lubrication system 100 of FIG. 1 in that it includes a heat exchanger exhaust path 25, a heat exchanger 52, an on-off valve 62, and an on-off valve 63.

  The heat exchanger exhaust path 25 is a path for circulating the exhaust of the exhaust path 21 between the heat exchanger 52 and the exhaust path 21.

  The heat exchanger 52 is a device that performs heat exchange between the oil in the oil path 23 and the exhaust gas in the heat exchanger exhaust path 25.

  The on-off valve 62 is disposed in the oil path 23. The on-off valve 62 stops and starts the inflow of oil to the heat exchanger 52 in response to an instruction from the ECU 70. When the on-off valve 62 is closed, the oil inflow to the heat exchanger 52 is stopped, and when the on-off valve 62 is open, the oil inflow to the heat exchanger 52 is started. The on-off valve 63 is disposed in the heat exchanger exhaust path 25. The on-off valve 63 stops and starts the inflow of exhaust gas to the heat exchanger 52 in response to an instruction from the ECU 70. When the on-off valve 63 is closed, the exhaust inflow to the heat exchanger 52 is stopped, and when the on-off valve 63 is open, the exhaust inflow to the heat exchanger 52 is started. That is, the heat exchanger 52, the on-off valve 62, and the on-off valve 63 have a function as a heating unit that heats the oil in the oil passage 23 with the exhaust gas of the internal combustion engine. The lubrication system 100a may include only one of the on-off valve 62 and the on-off valve 63.

  The ECU 70 controls the operation of the oil jet device 40 based on the temperature of the piston estimated and calculated based on the fuel injection amount. Since the detailed description of this control is the same as that of the first embodiment, it is omitted.

  Further, the ECU 70 controls the operations of the on-off valve 62 and the on-off valve 63 based on the acquisition result of the temperature sensor 30. Specifically, the ECU 70 opens and closes the on-off valve 62 so that heat exchange is performed in the heat exchanger 52 when the acquisition result of the temperature sensor 30 is equal to or lower than a predetermined temperature (for example, about 80 degrees) that requires warm-up. And the on-off valve 63 is opened. In this case, in the heat exchanger 52, the oil is heated by the exhaust gas. Thereby, oil can be heated up early. On the other hand, the ECU 70 controls the on-off valve 62 and the on-off valve 63 so that the heat exchange in the heat exchanger 52 is stopped because warm-up is not required when the acquisition result of the temperature sensor 30 is not below the predetermined temperature. To do. In this case, oil heating in the heat exchanger 52 is stopped.

  Also in the lubrication system 100a according to the present embodiment, the temperature of the piston and oil can be raised quickly.

  Although the preferred embodiments of the present invention have been described in detail above, the present invention is not limited to such specific embodiments, and various modifications and changes can be made within the scope of the gist of the present invention described in the claims. It can be changed.

DESCRIPTION OF SYMBOLS 10 Internal combustion engine 22 Exhaust gas recirculation path 30 Temperature sensor 40 Oil jet apparatus 50 1st EGR cooler 51 2nd EGR cooler 52 Heat exchanger 60 EGR valve 61 Three-way valve 62 Open / close valve 63 Open / close valve 70 ECU
100 Internal combustion engine lubrication system

Claims (3)

Driving information acquisition means for acquiring information relating to the operating state of the internal combustion engine;
Oil jet means for supplying oil to the piston of the internal combustion engine;
Heating means for heating oil supplied to the oil jet means by exhaust gas of the internal combustion engine;
Controlling the operation of the oil jet means based on the acquisition result of the operation information acquisition means, and a control means for controlling the operation of the heating means ,
The operation information acquisition means includes piston temperature information acquisition means for acquiring information for determining the temperature of the piston among information relating to the operation state of the internal combustion engine, and the oil jet among information relating to the operation state of the internal combustion engine. Oil temperature information acquisition means for acquiring information for determining the temperature of oil supplied to the means,
The control means controls the operation of the oil jet means based on the acquisition result of the piston temperature information acquisition means, and controls the operation of the heating means based on the acquisition result of the oil temperature information acquisition means. An internal combustion engine lubrication system. An exhaust gas recirculation path for returning a part of the exhaust gas of the internal combustion engine to intake air;
2. The internal combustion engine lubrication system according to claim 1 , wherein the heating unit includes an EGR cooler that exchanges heat between the exhaust gas in the exhaust gas recirculation path and the oil supplied to the oil jet unit . The control means controls the oil jet means so that the supply of oil to the piston is stopped when the temperature of the piston, which is the acquisition result of the piston temperature information acquisition means, is a predetermined value or less, When the temperature of the refrigerant of the internal combustion engine or the temperature of the oil supplied to the oil jet means, which is the acquisition result of the oil temperature information acquisition means, is not more than a predetermined value, the oil supplied to the oil jet means is the internal combustion engine. The lubrication system for an internal combustion engine according to claim 1 or 2, wherein the heating means is controlled so as to be heated by the exhaust gas .

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