Method, apparatus, and system for optimizing exhaust backpressure of internal combustion engine

Abstract

A method for optimizing exhaust backpressure of an internal combustion engine, comprising the following steps: 1) arranging a damping component in an exhaust passage of the internal combustion engine, and allowing an exhaust discharged by the internal combustion engine to pass through the damping component; and 2) allowing the exhaust to be cooled prior to passing through the damping component, or allowing the exhaust to be cooled while passing through the damping component. The method allows for relatively high exhaust backpressure when the internal combustion engine has a low load, and for preventing the exhaust pressure from rising excessively rapid when the internal combustion engine has a heavy load. The apparatus and system for optimizing exhaust backpressure of an internal combustion engine is also provided.

What is claimed is: 
     
         1 . A method for optimizing exhaust backpressure of an internal combustion engine, comprising:
 1) providing a damping member in an exhaust passage of an internal combustion engine, and making exhaust gas discharged from said internal combustion engine passing through said damping member;   2) cooling the exhaust gas before passing through said damping member, or cooling the exhaust gas while passing through said damping member.   
     
     
         2 . A method as claimed in  claim 1 , wherein said damping member is a member able to reduce a cross-section of the exhaust passage. 
     
     
         3 . A method as claimed in  claim 2 , wherein said member able to reduce a cross-section of the exhaust passage is an exhaust pipe with abruptly reduced cross-sections. 
     
     
         4 . A method as claimed in  claim 2 , wherein said member able to reduce a cross-section of the exhaust passage is a member having pores disposed in the exhaust pipe. 
     
     
         5 . A method as claimed in  claim 1 , wherein said damping member is a member that is able to split the exhaust gas into a plurality of small tributaries. 
     
     
         6 . A method as claimed in  claim 1 , wherein said damping member is an exhaust pipe able to change a flow direction of the exhaust gas. 
     
     
         7 . A method as claimed in  claim 1 , wherein a method of cooling the exhaust gas is: dividing the exhaust gas into a plurality of small tributaries, and then making the scattered small tributaries exchange heat with a cooling medium. 
     
     
         8 . A method as claimed in  claim 1 , wherein a method of cooling the exhaust gas is: making the exhaust gas and a cooling liquid come into contact with each other. 
     
     
         9 . A method as claimed in  claim 1 , wherein a method of cooling the exhaust gas is: making the exhaust gas pass through a member having a large number of gaps to be divided into a plurality of small tributaries, and making said small tributaries and a cooling liquid come into contact in said gaps. 
     
     
         10 . A method as claimed in  claim 1 , wherein said damping member is located within a housing, and the exhaust gas discharged from an internal combustion engine is cooled within the housing, wherein said method further comprises: making the exhaust gas discharged from the internal combustion engine enter into an interior of said housing through a exhaust gas inlet of said housing, and then making the cooled exhaust gas discharge out of said housing through a exhaust gas outlet of said housing. 
     
     
         11 . A method as claimed in  claim 10 , wherein an abrupt expansion of cross-sections is formed from said exhaust gas inlet to the interior of said housing. 
     
     
         12 . A method as claimed in  claim 11 , wherein the cross-section area of said exhaust gas inlet is 0.05 to 0.5 times the cross-sectional area of said housing. 
     
     
         13 . A method as claimed in  claim 1 , wherein a method of cooling the exhaust gas is: making the exhaust gas and a cooling liquid come into contact with each other in an interior of a housing, wherein said method further comprises: making the cooling liquid enter into an interior of the housing through a cooling water inlet of said housing, and discharging the cooling liquid having absorbed heat of the exhaust gas from the housing through a cooling water outlet of said housing. 
     
     
         14 . A method as claimed in  claim 13 , wherein said cooling liquid is cooling water in natural water body, wherein said method further comprises: extracting cooling water from natural water body and conveying it to said housing. 
     
     
         15 . A method as claimed in  claim 13 , wherein said cooling liquid is cooling water of an internal combustion engine, wherein said method further comprises: conveying cooling water of an internal combustion engine to said housing. 
     
     
         16 . A method as claimed in  claim 13 , wherein said method further comprises: conveying the cooling liquid having absorbed heat of the exhaust gas to a heat utilization apparatus or a heat exchanger. 
     
     
         17 . A method as claimed in  claim 1 , wherein said method further comprises: the exhaust gas discharged from an internal combustion engine flowing through impellers of a turbocharger working prior to entering said housing. 
     
     
         18 . An apparatus for optimizing exhaust backpressure of an internal combustion engine, comprising:
 1) a housing;   2) a exhaust gas inlet provided on the housing allowing a exhaust gas to enter into an interior of the housing, a exhaust gas outlet provided thereon allowing a exhaust gas to be discharged out of the housing;   3) a damping member provided in the interior of the housing or on the housing;   4) a cooling member provided in the interior of the housing for cooling a exhaust gas.   
     
     
         19 . An apparatus as claimed in  claim 18 , wherein an abrupt expansion of cross-sections is formed from said exhaust gas inlet to the interior of said housing. 
     
     
         20 . An apparatus as claimed in  claim 19 , wherein the cross-section area of said exhaust gas inlet is 0.05 to 0.5 times the cross-sectional area of said housing. 
     
     
         21 . An apparatus as claimed in  claim 18 , wherein said damping member is a padding layer of paddings filled in said housing with gaps therebetween. 
     
     
         22 . An apparatus for optimizing exhaust backpressure of an internal combustion engine, comprising:
 1) a housing;   2) a exhaust gas inlet provided on the housing allowing a exhaust gas to enter into an interior of the housing, a exhaust gas outlet provided thereon allowing a exhaust gas to be discharged out of the housing;   3) a damping member provided in an interior of the housing or on the housing;   4) a cooling water inlet provided on the housing allowing cooling water to enter into the housing, a cooling water outlet provided thereon allowing cooling water to be discharged out of the housing;   said cooling water inlet, cooling water outlet, exhaust gas inlet and exhaust gas outlet configured so that cooling water and exhaust gas able to come in to contact with each other in an interior of the housing.   
     
     
         23 . A system for optimizing exhaust backpressure of an internal combustion engine, comprising an exhaust passage of an internal combustion engine, wherein said system further comprises an apparatus for optimizing exhaust backpressure of an internal combustion engine as claimed in  claim 22 , which is mounted in said exhaust passage of an internal combustion engine. 
     
     
         24 . A system as claimed in  claim 23 , further comprising an apparatus for allowing exhaust gas emission to generate pressure drop, mounted in said exhaust passage of an internal combustion engine, and located downstream of said apparatus for optimizing exhaust backpressure of an internal combustion engine. 
     
     
         25 . A system as claimed in  claim 23 , further comprising: an apparatus able to extract cooling water from natural water, and convey it to said housing. 
     
     
         26 . A system as claimed in  claim 23 , further comprising: an apparatus able to convey cooling water of an internal combustion engine to said housing. 
     
     
         27 . A system as claimed in  claim 23 , further comprising a heat utilization apparatus or heat exchanger, and a pipe able to convey fluid from said housing to said heat utilization apparatus or heat exchanger. 
     
     
         28 . A system as claimed in  claim 23 , further comprising a turbocharger, said exhaust passage of an internal combustion engine is a exhaust gas passage connected to an exhaust port at the exhaust gas side of said turbocharger. 
     
     
         29 . A method for muffling exhaust gas of an internal combustion engine, comprising: discharging a high-temperature exhaust gas from an internal combustion engine entering into an interior of a housing through a exhaust gas inlet on the housing, and further comprising: allowing the high-temperature exhaust gas entering into an interior of the housing and a cooling liquid come into contact with each other.