JP2009215915A - Oil accumulation prevention device within intercooler - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an oil accumulation prevention device within an intercooler capable of preventing accumulation of oil within the intercooler. <P>SOLUTION: An engine has a turbocharger and the intercooler 12. An opening/closing lid 32 opens/closes a through-hole 31 of oil drainage provided in an oil receiving part 22 of the intercooler 12. A sensor 34 detects presence/absence of oil in the oil receiving part 22 of the intercooler 12. When oil is detected in the oil receiving part 22 of the intercooler 12 by the sensor 34, an engine ECU 35 controls drive equipment 33 at stop of the engine and drives the opening/closing lid 32 from the position for closing the through-hole 31 for oil drainage to the position for opening it. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an oil pool preventing device in an intercooler.

  In a diesel engine or a gasoline engine, when a turbocharger and an intercooler are mounted, oil mixed in the supply air piping from the turbocharger or blow-by gas reduction device (PCV) is likely to accumulate in the intercooler. Since the oil accumulated in the intercooler has no place to go, it is sucked into the intake manifold by the intake air of the engine and eventually burns in the engine.

  However, when the engine is under low load and rotation, the oil entering the intake manifold is difficult to flow from the intake manifold due to the small intake flow rate, and the oil adhering to the intake valve also burns because the combustion temperature in the combustion chamber is low. Absent. As a result, the oil that has solidified adheres to the intake valve, which causes the intake valve to close and cause a decrease in engine output.

  Patent Document 1 has a configuration in which a drain port is provided at the bottom of a drain pan of an intercooler of a marine engine equipped with a supercharger, and a float valve that closes by its own weight is seated on the drain port so as to be freely contacted and separated from above. It is disclosed. With this configuration, during operation of the engine, the internal pressure of the intercooler is used to keep the float valve closed, the drain port is closed to prevent air supply leakage, and the internal pressure of the intercooler when the engine is stopped When it drops, the float valve is lifted by the buoyancy of the condensed water to discharge the condensed water.

By using the technique of this patent document 1, it can be considered that oil accumulated in the intercooler is drained when the float valve is opened.
JP 2002-349273 A

  However, the configuration according to Patent Document 1 is for draining water, and when the oil deteriorates, the viscosity of the oil increases, and when the oil accumulated around the float valve is cooled, the float valve is fixed. In this way, when the float valve is opened, the deteriorated oil whose viscosity has increased cannot be removed through a slight gap between the drain port and the float valve. In particular, when the engine is in operation, the internal pressure of the intercooler is negative. Therefore, a device for taking out the highly viscous oil accumulated in the intercooler from the gap is required.

  The present invention has been made under such a background, and an object thereof is to provide an oil pool preventing device in an intercooler that can prevent oil from collecting in the intercooler.

  According to the first aspect of the present invention, in an engine provided with a supercharger and an intercooler, an opening / closing lid for opening / closing an oil draining through hole provided in an oil receiving portion of the intercooler, and the opening / closing lid, Drive means for driving the opening and closing positions of the through hole for extraction, a sensor for detecting the presence or absence of oil in the oil receiving portion of the intercooler, and the presence of oil in the oil receiving portion of the intercooler by the sensor The gist of the invention includes control means for controlling the driving means when the engine is stopped to drive the opening / closing lid from a position for closing the oil draining through hole to a position for opening.

  According to the first aspect of the present invention, when the control means has oil in the oil receiving portion of the intercooler by the sensor, the control means controls the driving means when the engine is stopped so that the opening / closing lid is closed from the position for closing the oil draining through hole. Drive to the open position. Thereby, the deteriorated oil in the oil receiving part of the intercooler, that is, the highly viscous oil can be reliably discharged. As a result, oil can be prevented from collecting in the intercooler.

  In the oil pool preventing device in the intercooler according to claim 1, if the opening / closing lid is configured to slide to open and close the oil draining through hole as described in claim 2, oil can be easily drained.

  In the oil pool preventing device in the intercooler according to claim 1, when the opening / closing lid is configured to rotate and open and close the oil draining through hole as described in claim 3, oil can be easily drained. .

  According to the present invention, it is possible to prevent oil from accumulating in the intercooler.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of the invention will be described with reference to the drawings.
In FIG. 1, the turbine wheel of the turbocharger 11 is provided in the exhaust system piping of the automobile diesel engine 1, and the turbine wheel of the turbocharger 11 is rotated by the exhaust gas discharged from the engine.

  On the other hand, an air cleaner 10, a compressor wheel of a turbocharger 11, an intercooler 12, and an intake manifold 13 are connected to the air supply system piping of the diesel engine 1 in order from the outside air side. Then, outside air is introduced into the air supply pipe through the air cleaner 10, the intake air is compressed by the compressor wheel of the turbocharger 11, and the compressed intake air is cooled by passing through the intercooler 12. It is sent to the combustion chamber via the manifold 13. Oil is used for lubrication in the turbocharger 11, and the oil supplied from the engine side lubricates and cools the bearing portion (the bearing portion that supports the shaft connecting the turbine wheel and the compressor wheel) and returns it to the engine side. It is. At this time, oil leaks into the air supply system in the turbocharger 11.

  Further, the cylinder head cover 14 of the engine 1 and the air cleaner 10 and the turbocharger 11 in the air supply system pipe are connected by a pipe (PCV pipe) 15 of the blow-by gas reduction device. The cylinder head cover 14 and the case of the air cleaner 10 may be connected by the PCV pipe 15.

  About the above-mentioned intercooler 12, the housing | casing 20 has comprised the cylinder shape extended up and down. An air-cooled heat exchanger 21 is disposed in the central portion of the casing 20 in the vertical direction. An oil receiving portion 22 is provided below the heat exchanger 21 in the housing 20.

  An air introduction pipe 23 is connected to the lower part of the casing 20, and compressed air from the turbocharger 11 is introduced into the casing 20 through the air introduction pipe 23. An air discharge pipe 24 is connected to the upper portion of the housing 20, and the compressed air is discharged to the air discharge pipe 24 toward the intake manifold 13. When compressed air passes through the housing 20 from the bottom to the top, the air-cooled heat exchanger 21 exchanges heat with the outside air. Therefore, the air compressed and heated by the turbocharger 11 is cooled by passing through the heat exchanger 21, and the cooled air is sent to the combustion chamber via the intake manifold 13. The heat exchanger 21 may be a water cooling type instead of the air cooling type.

  Further, an oil pool preventing device 30 in the intercooler is provided. Hereinafter, the oil pool preventing device 30 in the intercooler will be described with reference to FIG. 2 in which the lower part of the intercooler 12 is enlarged.

An oil draining through hole 31 is provided in the oil receiving portion 22 of the intercooler 12, and an opening / closing lid 32, a driving device 33, a sensor 34, and the like are disposed.
In FIG. 2, a circular oil removal through hole 31 is formed on the bottom surface of the oil receiving portion 22 of the intercooler 12. An open / close lid 32 is provided on the oil receiving portion 22 of the intercooler 12. The opening / closing lid 32 can open and close the through hole 31 for oil removal. During engine operation, the oil draining through hole 31 is closed by the opening / closing lid 32, so that the air supply does not leak. The opening / closing lid 32 can be driven to a position for closing and opening the through hole 31 for oil removal by a driving device 33 as a driving means.

  An infrared sensor 34 is provided on the ceiling of the oil receiver 22 in the intercooler 12. The infrared sensor 34 emits infrared rays toward the bottom surface of the lower oil receiver 22 and receives the reflected light. The reflected light is strong when there is no oil in the oil receiver 22, but the reflected light becomes weak when there is oil in the oil receiver 22, so that the presence or absence of oil in the oil receiver 22 of the intercooler 12 can be detected. It has become.

  On the other hand, the drive device 33 and the sensor 34 are connected to an engine ECU (electronic control unit) 35. The engine ECU 35 receives an ignition switch operation signal, a signal from an engine speed sensor, and the like. As a result, the engine ECU 35 can detect whether or not the engine is stopped.

FIG. 3 shows an example of the opening / closing lid 32 and the driving device 33. FIG. 3A is a longitudinal sectional view, and FIG. 3B is a bottom view of the intercooler 12, that is, a view as seen from the direction of arrow A in FIG.
In FIG. 3, the bottom of the oil receiving portion 22 of the intercooler 12 extends in the horizontal direction. A circular through hole 31 is formed at the center of the bottom of the oil receiving portion 22. A rectangular slide plate 40 is disposed on the bottom surface of the bottom of the oil receiving portion 22, and a pair of L-shaped guide rails 41 and 42 are provided at locations corresponding to the long sides of the rectangular slide plate 40. Yes. The pair of L-shaped guide rails 41 and 42 enables the slide plate 40 to slide in the horizontal direction along the lower surface of the oil receiving portion 22.

  The rectangular slide plate 40 has a circular through hole 40a. Further, the slide plate 40 is urged leftward by a compression spring 43 as indicated by a force F1 in FIG. An open / close lid 32 is constituted by the slide plate 40 and the guide rails 41 and 42.

  A cylinder 44 as an actuator is attached to the lower surface of the oil receiving portion 22 of the intercooler 12, and a rod 44a of the cylinder 44 can be projected and retracted. When the cylinder 44 is not operated, the slide plate 40 is positioned on the left side by the biasing force of the spring 43, and the through hole 31 of the oil receiving portion 22 of the intercooler 12 is closed by the slide plate 40. On the other hand, the slide plate 40 slides against the urging force of the spring 43 by the protruding operation of the rod 44 a of the cylinder 44. As a result, the circular through hole 31 of the oil receiving portion 22 of the intercooler 12 and the circular through hole 40a of the slide plate 40 overlap, the through hole 31 of the oil receiving portion 22 is opened, and the oil receiving portion of the intercooler 12 is opened. The inside of 22 is in communication with the outside of the intercooler 12.

The cylinder 44 and the compression spring 43 constitute a drive device (drive means) 33 that drives the open / close lid 32 to a position for closing and opening the oil draining through hole 31.
Next, the operation of the oil pool preventing device 30 configured as described above will be described.

  The oil generated from the turbocharger 11 and the blow-by gas reduction device (PCV) enters the combustion chamber through the intake manifold 13 to a certain extent and is combusted. Oil is likely to accumulate in the oil receiving portion 22 at the lower portion of 12.

  In FIG. 3, the sensor 34 detects the presence or absence of oil in the oil receiver 22 of the intercooler 12. On the other hand, the engine ECU 35 determines whether or not the engine is stopped. If there is no oil in the oil receiving portion 22 of the intercooler 12, the engine ECU 35 keeps the through hole 31 closed by the slide plate 40 even when the engine is stopped.

On the other hand, when the oil 36 is present in the oil receiving portion 22 of the intercooler 12, as shown in FIG.
The sensor 34 detects that oil is present in the oil receiver 22 of the intercooler 12, and this oil detection signal is sent to the engine ECU 35. When the engine ECU 35 detects that the oil 36 is present in the oil receiving portion 22 of the intercooler 12, it determines whether the ignition switch is turned off or the engine speed has become zero. The engine ECU 35 drives the cylinder 44 to cause the cylinder rod 44a to protrude when the engine is stopped. As a result, the slide plate 40 slides to the right in FIG. 4 so that the circular through hole 31 of the oil receiving portion 22 of the intercooler 12 and the circular through hole 40a of the slide plate 40 overlap, and the oil receiving portion of the intercooler 12 is overlapped. The inside of 22 is in communication with the outside. As described above, the engine ECU 35 as the control means controls the driving device 33 when the engine is stopped when the oil receiving portion 22 of the intercooler 12 is oiled by the infrared sensor 34, and opens and closes the opening / closing lid 32. The through hole 31 for driving is driven from a position to close to a position to open.

  Thereby, the through hole 31 is completely opened, and deteriorated oil in the oil receiving portion 22 of the intercooler 12, that is, high-viscosity oil 36 is discharged outside through the through hole 31 of the oil receiving portion 22. As a result, oil can be prevented from collecting in the intercooler 12. Therefore, it is difficult for oil to go to the downstream side of the intercooler 12, and it is possible to prevent the intake valve from closing due to the solid oil adhering to the intake valve of the engine.

This will be described in more detail.
Conventionally, the oil accumulated in the oil receiving portion 22 of the intercooler 12 is sucked into the intake manifold 13 by the intake force, and eventually the solid oil is attached to the intake valve of the engine, causing the intake valve to be closed and performance. Decreases.

  On the other hand, in this embodiment, if the oil is present in the oil receiving portion 22 of the intercooler 12 by the sensor 34, the oil is automatically discharged when the engine is stopped. As a result, the oil accumulated in the intercooler 12 can be prevented from being sucked into the intake manifold 13 due to the influence of intake air (preventing oil from flowing into the intake manifold 13), and the solid shape to the intake valve can be prevented. Can prevent stickiness of oil. This prevents the valve from being closed. As a result, engine performance can be maintained over time, even with the use of a car.

According to the above embodiment, the following effects can be obtained.
(1) The oil pool preventing device 30 in the intercooler includes a slide type opening / closing lid 32 that opens and closes an oil draining through hole 31 provided in the oil receiving portion 22 of the intercooler 12. When there is oil in the 12 oil receiving portions 22, the oil draining through hole 31 is opened by the driving device 33 when the engine is stopped. Therefore, oil can be prevented from collecting in the intercooler 12.

(2) Since the opening / closing lid 32 is configured to slide to open / close the oil draining through hole 31, the oil can be easily drained.
The embodiment is not limited to the above, and may be embodied as follows, for example.

  In FIG. 3, the slide-type opening / closing lid 32 is used, but a hinge-type opening / closing lid may be used. For example, as shown in FIGS. 5A and 5B, the shaft 51 is rotatably supported by a pair of bearing plates 52 and 53, and the rotating plate 50 is fixed to the shaft 51. The shaft 51 is provided with an urging mechanism (for example, a torsion coil spring) 54, and an urging force F <b> 10 is applied to the rotating plate 50 by the urging mechanism 54, whereby the rotating plate 50 closes the through hole 31. A motor 57 is coupled to the shaft 51 via gears 55 and 56. By driving the motor 57, the rotation plate 50 is rotated from the horizontal direction to the vertical direction against the urging force F10 by the urging mechanism 54 to open the through hole 31. The bearing plates 52 and 53, the shaft 51, and the rotation plate 50 constitute an opening / closing lid, and the urging mechanism 54 and the motor 57 constitute a driving device (driving means). In this way, the opening / closing lid is configured to rotate to open and close the oil draining through hole 31, so that oil can be easily drained.

  -As shown in FIG. 6, the structure of the oil receiving part of the intercooler may be a structure that is sharper toward the lower side. A through hole 31 may be provided in the side surface of the lower tip portion of the oil receiving portion of the intercooler, closed with an opening / closing lid 32, and opened with a driving device (driving means) 33.

  Although an infrared sensor is used as a sensor, a temperature sensing sensor may be used instead. In other words, a temperature-sensitive sensor is arranged at the bottom of the oil receiver 22 of the intercooler, and it can be detected that there is no oil if the sensed temperature is low, and that oil is present if the sensed temperature is high. . If this temperature sensing type sensor is used, it becomes possible to detect oil quantitatively (it becomes possible to determine that the amount of oil is larger as the temperature is higher).

  A dedicated controller may be used in place of the engine ECU, and an operation signal from the ignition switch and a signal from the oil detection sensor of the intercooler may be taken into the controller to control the drive device (drive means).

  Although FIG. 1 etc. demonstrated the engine provided with the exhaust turbine drive supercharger, it is also possible to apply to the engine provided with the machine drive supercharger in FIG. That is, it is good also as a structure which prevents that the oil by a blow-by gas reduction apparatus (PCV) accumulates in an intercooler.

・ It can be applied to gasoline engines in addition to diesel engines.
Instead of opening / closing the opening / closing lid 32 by a driving device (driving means), the oil draining through hole 31 may be opened / closed by manually opening / closing the opening / closing lid 32.

The block diagram of the engine periphery in this embodiment. The block diagram of an oil pool prevention apparatus. (A) is a longitudinal cross-sectional view of an oil pool prevention apparatus, (b) is a bottom view of (a). (A) is a longitudinal cross-sectional view of an oil pool prevention apparatus, (b) is a bottom view of (a). (A) is a longitudinal cross-sectional view of another example of an oil reservoir prevention device, (b) is a bottom view of (a). The longitudinal cross-sectional view of the oil retention apparatus of another example.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Engine, 11 ... Turbocharger, 12 ... Intercooler, 22 ... Oil receiving part, 30 ... Oil accumulation prevention device, 31 ... Oil drain through-hole, 32 ... Opening / closing lid, 33 ... Drive equipment, 34 ... Sensor, 35 ... Engine ECU.

Claims (3)

In an engine with a supercharger and an intercooler,
An opening and closing lid for opening and closing an oil draining through hole provided in an oil receiving portion of the intercooler;
Driving means for driving the opening / closing lid to a position for closing and opening the through hole for oil drainage;
A sensor for detecting the presence or absence of oil in the oil receiver of the intercooler;
Control means for controlling the driving means when the engine is stopped when the oil is received in the oil receiving portion of the intercooler by the sensor to drive the opening / closing lid from a position to close the through hole for oil drainage. When,
A device for preventing oil accumulation in the intercooler. 2. The oil pool preventing device in an intercooler according to claim 1, wherein the opening / closing lid slides to open and close the oil draining through hole. 2. The oil pool preventing device in an intercooler according to claim 1, wherein the opening / closing lid rotates to open / close the through hole for oil draining.

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