Blowby-gas reflux system, blowby-gas reflux-system control device, and recording medium

Abstract

A blowby-gas reflux system 60 has: a blowby-gas reflux path 70; an atmospheric release mechanism 90 that releases, into the atmosphere, blowby gas Gb that has passed through an oil separator 80; and a control device 50. The control device 50 is provided with: a determination unit 51 that determines whether oil caulking occurs in a compressor 41 on the basis of the operating state of the compressor; and a control unit 51 that stops the release of the blowby gas into the atmosphere performed by the atmospheric release mechanism if the determination unit determines that oil caulking does not occur, and that causes the atmospheric release mechanism to release the blowby gas into the atmosphere if the determination unit determines that oil caulking occurs.

1 . A blow-by gas reflux system comprising:
 a blow-by gas reflux path causing a blow-by gas discharged from an internal combustion engine to pass through an oil separator, which is configured to remove oil from the blow-by gas, and then refluxing the blow-by gas to an intake passage of the internal combustion engine positioned on a further upstream-side than a compressor of a supercharger disposed on the intake passage;   an atmospheric release mechanism disposed at a position further downstream side of the blow-by gas reflux path than the oil separator, the atmospheric release mechanism being configured to release the blow-by gas after passing through the oil separator into an atmosphere; and   a control device; configured to:
 determine whether oil caulking occurs in the compressor, based on an operating state of the compressor, the oil caulking being caused due to oil contained in the blow-by gas after passing through die oil separator;
 in a case it is determined that the oil caulking does not occur, stop the release of the blow-by gas into the atmosphere performed by die atmospheric release mechanism; and 
 in a case it is determined that the oil caulking occurs, control the atmospheric release mechanism to release the blow-by gas into the atmosphere. 
 
   
     
     
         2 . The blow-by gas reflux system according to  claim 1 ,
 wherein the control device is configured to further determine whether an atmospheric temperature is equal to or lower than a predetermined threshold value,   wherein in a case it is determined that the oil caulking occurs and also determined that the atmospheric temperature is equal to or lower than the threshold value, the control device is configured to stop the release of the blow-by gas into the atmosphere performed by the atmospheric release mechanism, and   wherein in a case it is determined that the oil caulking occurs and also determined that the atmospheric temperature is not equal to or lower titan the threshold value, the control device is configured to control the atmospheric release mechanism to release the blow-by gas into the atmosphere.   
     
     
         3 . A control device applied to a blow-by gas reflux system,
 the blow-by gas reflux system comprising: a blow-by gas reflux path for causing a blow-by gas discharged from an internal combustion engine to pass through an oil separator, which is configured to remove oil from the blow-by gas, and then refluxing the blow-by gas to an intake passage of the internal combustion engine positioned on a further upstream-side than a compressor of a supercharger disposed on the intake passage; and an atmospheric release mechanism disposed at a further downstream-side part of the blow-by gas reflux path than the oil separator and configured to release the blow-by gas after passing through the oil separator into an atmosphere,   the control device being configured to:
 determine whether oil caulking occurs in the compressor, based on an operating state of the compressor, the oil caulking being caused due to oil contained in the blow-by gas after passing through the oil separator;
 in a case it is determined that the oil caulking does not occur, stop the release of the blow-by gas into the atmosphere performed by the atmospheric release mechanism; and 
 in a case it is determined that the oil caulking occurs, control the atmospheric release mechanism to release the blow-by gas into the atmosphere. 
 
   
     
     
         4 . A non-transitory computer-readable storage medium storing a computer program readable by a computer of a vehicle,
 the vehicle comprising a blow-by gas reflux system comprising: a blow-by gas reflux path for causing a blow-by gas discharged from an internal combustion engine to pass through an oil separator configured to remove oil from the blow-by gas and then refluxing the blow-by gas to an intake passage of the internal combustion engine positioned on a further upstream-side than a compressor of a supercharger disposed on the intake passage; and an atmospheric release mechanism disposed at a further downstream-side part of the blow-by gas reflux path than the oil separator and configured to release the blow-by gas after passing through the oil separator into an atmosphere,   the computer program, when executed by the computer, causes the vehicle to perform:
 determining whether oil caulking occurs in the compressor, based on an operating state of the compressor, the oil caulking being caused due to oil contained in the blow-by gas after passing through the oil separator; 
 in a case it is determined that the oil caulking does not occur, stopping the release of the blow-by gas into the atmosphere performed by the atmospheric release mechanism; and 
 in a case it is determined that the oil caulking occurs, causing the atmospheric release mechanism to release the blow-by gas into the atmosphere. 
   
     
     
         5 . The non-transitory computer-readable storage medium according to  claim 4 , wherein the computer program, when executed by the computer, causes the vehicle to further execute:
 determining whether an atmospheric temperature is equal to or lower than a predetermined threshold value, when it is determined that the oil caulking occurs;   in a case it is determined that the oil caulking occurs and it is also determined that the atmospheric temperature is equal to or lower than the threshold value, stopping the release of the blow-by gas into the atmosphere performed by the atmospheric release mechanism; and   in a case it is determined that the oil caulking occurs and it is also determined that the atmospheric temperature is not equal to or lower than the threshold value, causing the atmospheric release mechanism to release the blow-by gas into the atmosphere.