Blow-by gas recirculation device for internal combustion engine

Abstract

If the pressure of the section of the air intake path downstream of a compressor wheel becomes higher than the pressure of the section on the upstream side, a flow of air is produced in a bypass pipe and an ejector draws in blow-by gas from within a first gas pipe. The blow-by gas sucked into the ejector from the first gas pipe flows into the section of the air intake path upstream of the compressor wheel by way of the bypass pipe. The blow-by gas recirculation device has a structure in which the section of at least the bypass pipe or the first gas pipe that connects to the other components separates at the same time the other piping located in the vicinity of the internal combustion engine separates. The other piping is piping that will affect a monitorable engine operation state when separated.

1 - 9 . (canceled) 
     
     
         10 . A blow-by gas recirculation device applied to an internal combustion engine in which a forced-induction device provided in an intake passage performs forced induction, the device comprising:
 a gas pipe into which blow-by gas that has flowed out of a combustion chamber of the internal combustion engine flows;   a bypass pipe, which connects a section of the intake passage upstream of the forced-induction device and a section of the intake passage downstream of the forced-induction device to each other; and   an ejector provided in the bypass pipe, wherein the gas pipe is connected to the ejector, and the ejector recirculates the blow-by gas to the intake passage via the bypass pipe by drawing in the blow-by gas in the gas pipe using the flow of air in the bypass pipe, wherein   at least one of the bypass pipe and the gas pipe is coupled to a different pipe located in the vicinity of the internal combustion engine,   the different pipe is a pipe that, if detached, would have an influence on a monitorable engine operating state, and   the device monitors the engine operating state that is influenced by detachment of the different pipe, and detects detachment, from a connected component, of a connection portion of at least one of the bypass pipe and the gas pipe that is coupled to the different pipe, based on a change in the engine operating state.   
     
     
         11 . The blow-by gas recirculation device according to  claim 10 , further comprising a stop valve that operates to permit and block flow of the blow-by gas that has flowed out of the combustion chamber of the internal combustion engine toward the gas pipe,
 wherein, when detecting detachment, from the connected component, of the connection portion of at least one of the bypass pipe and the gas pipe that is coupled to the different pipe, the blow-by gas recirculation device inhibits the flow of the blow-by gas toward the gas pipe by closing the stop valve.   
     
     
         12 . The blow-by gas recirculation device for an internal combustion engine according to  claim 10 , wherein the different pipe is a negative pressure pipe for causing intake negative pressure of the engine to act on an actuator that is driven by the intake negative pressure to adjust forced-induction pressure of the internal combustion engine generated by the forced-induction device. 
     
     
         13 . The blow-by gas recirculation device for an internal combustion engine according to  claim 10 , wherein
 the gas pipe is a first gas pipe, and a throttle valve is provided in the intake passage, and   the different pipe is a second gas pipe that allows the blow-by gas that has flowed out of the combustion chamber to flow to the section of the intake passage downstream of the throttle valve.   
     
     
         14 . The blow-by gas recirculation device for an internal combustion engine according to  claim 10 , wherein detachment of the connection portion of at least one of the bypass pipe and the gas pipe from the connected component is detachment of the bypass pipe from the intake passage. 
     
     
         15 . A blow-by gas recirculation device applied to an internal combustion engine in which a forced-induction device provided in an intake passage performs forced induction, the device comprising:
 a gas pipe into which blow-by gas that has flowed out of a combustion chamber of the internal combustion engine flows;   a bypass pipe, which connects a section of the intake passage upstream of the forced-induction device and a section of the intake passage downstream of the forced-induction device to each other; and   an ejector provided in the bypass pipe, wherein the gas pipe is connected to the ejector, and the ejector recirculates the blow-by gas to the intake passage via the bypass pipe by drawing in the blow-by gas in the gas pipe using the flow of air in the bypass pipe, wherein   at least one of the bypass pipe and the gas pipe is coupled to a different pipe located in the vicinity of the internal combustion engine, and   the different pipe is a negative pressure pipe for causing intake negative pressure of the internal combustion engine to act on an actuator that is driven by the intake negative pressure to adjust forced-induction pressure of the internal combustion engine generated by the forced-induction device.   
     
     
         16 . A blow-by gas recirculation device applied to an internal combustion engine in which a forced-induction device provided in an intake passage performs forced induction, the device comprising:
 a gas pipe into which blow-by gas that has flowed out of a combustion chamber of the internal combustion engine flows;   a bypass pipe, which connects a section of the intake passage upstream of the forced-induction device and a section of the intake passage downstream of the forced-induction device to each other; and   an ejector provided in the bypass pipe, wherein the gas pipe is connected to the ejector, and the ejector recirculates the blow-by gas to the intake passage via the bypass pipe by drawing in the blow-by gas in the gas pipe using the flow of air in the bypass pipe, wherein   at least one of the bypass pipe and the gas pipe is coupled to a different pipe located in the vicinity of the internal combustion engine,   the gas pipe is a first gas pipe, and a throttle valve is provided in the intake passage, and   the different pipe is a second gas pipe that allows the blow-by gas that has flowed out of the combustion chamber to flow to the section of the intake passage downstream of the throttle valve.   
     
     
         17 . The blow-by gas recirculation device for an internal combustion engine according to  claim 10 , wherein at least one of the bypass pipe and the gas pipe is mechanically coupled to the different pipe. 
     
     
         18 . The blow-by gas recirculation device for an internal combustion engine according to  claim 10 , wherein at least one of the bypass pipe and the gas pipe is integrally formed with the different pipe. 
     
     
         19 . The blow-by gas recirculation device for an internal combustion engine according to  claim 10 , wherein at least one of the bypass pipe and the gas pipe is connected to the different pipe by welding or by a bundling tool. 
     
     
         20 . The blow-by gas recirculation device for an internal combustion engine according to  claim 15 , wherein at least one of the bypass pipe and the gas pipe is mechanically coupled to the different pipe. 
     
     
         21 . The blow-by gas recirculation device for an internal combustion engine according to  claim 15 , wherein at least one of the bypass pipe and the gas pipe is integrally formed with the different pipe. 
     
     
         22 . The blow-by gas recirculation device for an internal combustion engine according to  claim 15 , wherein at least one of the bypass pipe and the gas pipe is connected to the different pipe by welding or by a bundling tool. 
     
     
         23 . The blow-by gas recirculation device for an internal combustion engine according to  claim 16 , wherein at least one of the bypass pipe and the gas pipe is mechanically coupled to the different pipe. 
     
     
         24 . The blow-by gas recirculation device for an internal combustion engine according to  claim 16 , wherein at least one of the bypass pipe and the gas pipe is integrally formed with the different pipe. 
     
     
         25 . The blow-by gas recirculation device for an internal combustion engine according to  claim 16 , wherein at least one of the bypass pipe and the gas pipe is connected to the different pipe by welding or by a bundling tool.