Exhaust gas cleaning device

Claim 2

An exhaust gas cleaning device for cleaning the exhaust gases of an engine mounted on a vehicle by burning said exhaust gases in an exhaust gas combustion chamber, provided intermediate of the exhaust pipe of the engine, with secondary fuel and secondary air supplied to said combustion chamber, said device comprising said combustion chamber for re-burning the exhaust gases being led into the exhaust pipe of the engine, means for supplying the secondary air into said combustion chamber for re-burning the exhaust gases, first valve means for regulating the quantity of the secondary air supplied to the combustion chamber, means for supplying the secondary fuel into the combustion chamber for re-burning the exhaust gases, second valve means for regulating the quantity of the secondary fuel and means for operating said first and second valve means according to the temperature of said exhaust gas combustion chamber, the suction vacuum of the engine and the vehicle speed, whereby the quantities of the secondary fuel and the secondary air are regulated in at least five stages, i.e. the stage in which the temperature of the combustion chamber rises to the normal reaction temperature and the engine is quickly accelerated after the engine has been started, the stage in which the engine is in the idling phase after the temperature of the combustion chamber has reached the normal reaction temperature, the stage in which the engine is decelerated, the stage in which the temperature of the combustion chamber rises to an excessively high level and the stage in which the engine is in other operating phases, wherein said combustion chamber has a head chamber and said secondary air and secondary fuel introduced into said head chamber are ignited therein with the resulting combustion gases jetting into the combustion chamber, whereby the unburned components in the exhaust gases of the engine led into said combustion chamber are completely burned and cleaned, and wherein said head chamber has a central opening for introducing air and fuel therethrough and a porous body surrounding said central opening, and said secondary fuel is supplied into said head chamber through said central opening and said porous body.

Claim 3

An exhaust gas cleaning device for cleaning the exhaust gases of an engine mounted on a vehicle by burning saiD exhaust gases in an exhaust gas combustion chamber, provided intermediate of the exhaust pipe of the engine, with secondary fuel and secondary air supplied to said combustion chamber, said device comprising said combustion chamber for re-burning the exhaust gases being led into the exhaust pipe of the engine, means for supplying the secondary air into said combustion chamber for re-burning the exhaust gases, first valve means for regulating the quantity of the secondary air supplied to the combustion chamber, means for supplying the secondary fuel into the combustion chamber for re-burning the exhaust gases, second valve means for regulating the quantity of the secondary fuel and means for operating said first and second valve means according to the temperature of said exhaust gas combustion chamber, the suction vacuum of the engine and the vehicle speed, whereby the quantities of the secondary fuel and the secondary air are regulated in at least five stages, i.e. the stage in which the temperature of the combustion chamber rises to the normal reaction temperature and the engine is quickly accelerated after the engine has been started, the stage in which the engine is in the idling phase after the temperature of the combustion chamber has reached the normal reaction temperature, the stage in which the engine is decelerated, the stage in which the temperature of the combustion chamber rises to an excessively high level and the stage in which the engine is in other operating phases, wherein said first valve means for regulating the quantity of the secondary air includes a first valve for opening and closing a passage leading from air supply means to said combustion chamber, a second valve for closing said passage to release the air into the atmosphere and a third valve having apertures formed therein and located downstream of said first valve, and operations of said valves are controlled by said controlling means according to the temperature of the combustion chamber, the suction vacuum of the engine and the vehicle speed, whereby while the temperature of the combustion chamber rises to the normal reaction temperature and the engine is quickly accelerated and while the engine is idling, cruising and quickly accelerated after the engine has been warmed up, said first and third valves are opened and said second valve is closed to supply a large quantity of air into said combustion chamber, and said first valve is opened and said second and third valves are closed to supply a small quantity of air into said combustion chamber through the apertures formed in said third valve, respectively, whereas when the combustion chamber is overheated, said first valve is closed and said second valve is opened to release the air into the atmosphere.

Claim 4

An exhaust gas cleaning device for cleaning the exhaust gases of an engine mounted on a vehicle by burning saiD exhaust gases in an exhaust gas combustion chamber, provided intermediate of the exhaust pipe of the engine, with secondary fuel and secondary air supplied to said combustion chamber, said device comprising said combustion chamber for re-burning the exhaust gases being led into the exhaust pipe of the engine, means for supplying the secondary air into said combustion chamber for re-burning the exhaust gases, first valve means for regulating the quantity of the secondary air supplied to the combustion chamber, means for supplying the secondary fuel into the combustion chamber for re-burning the exhaust gases, second valve means for regulating the quantity of the secondary fuel and means for operating said first and second valve means according to the temperature of said exhaust gas combustion chamber, the suction vacuum of the engine and the vehicle speed, whereby the quantities of the secondary fuel and the secondary air are regulated in at least five stages, i.e. the stage in which the temperature of the combustion chamber rises to the normal reaction temperature and the engine is quickly accelerated after the engine has been started, the stage in which the engine is in the idling phase after the temperature of the combustion chamber has reached the normal reaction temperature, the stage in which the engine is decelerated, the stage in which the temperature of the combustion chamber rises to an excessively high level and the stage in which the engine is in other operating phases, wherein said first valve means for regulating the quantity of the secondary air includes a first valve for opening and closing a passage leading from air supply means to said combustion chamber, a second valve for closing said passage to release the air into the atmosphere and a third valve having apertures formed therein and located downstream of said first valve, and operations of said valves are controlled by said controlling means according to the temperature of the combustion chamber, the suction vacuum of the engine and the vehicle speed, whereby while the temperature of the combustion chamber rises to the normal reaction temperature and the engine is quickly accelerated and while the engine is idling, cruising and quickly accelerated after the engine has been warmed up, said first and third valves are opened and said second valve is closed to supply a large quantity of air into said combustion chamber, and said first valve is opened and said second and third valves are closed to supply a small quantity of air into said combustion chamber through the apertures formed in said third valve, respectively, whereas when the combustion chamber is overheated, said first valve is closed and said second valve is opened to release the air into the atmosphere.

Claim 5

An exhaust gas cleaning device as defined in claim 1, wherein the secondary air supplied to said head chamber and the exhaust gases supplied to said combustion chamber are introduced into the respective chambers in such a manner as to form swirling flows in said chambers.

Claim 6

An exhaust gas cleaning device as defined in claim 1, characterized in that, said exhaust gas and said secondary air are respectively introduced into said combustion chamber in a tangential direction of said chamber so as to form swirling flows in said chambers.

Claim 7

An exhaust gas cleaning device for cleaning the exhaust gases of an engine mounted on a vehicle by burning said exhaust gases in an exhaust gas combustion chamber, provided intermediate of the exhaust pipe of the engine with secondary fuel and secondary air supplied to said combustion chamber, said device comprising said combustion chamber for re-burning the exhaust gases being led into the exhaust pipe of the engine, means for supplying the secondary air into said combustion chamber for re-burning the exhaust gases, first valve means for regulating the quantity of the secondary air supplied to the combustion chamber, means for supplyiNg the secondary fuel into the combustion chamber for re-burning the exhaust gases, second valve means for regulating the quantity of the secondary fuel and means for operating said first and second valve means according to the temperature of said exhaust gas combustion chamber, the suction vacuum of the engine and the vehicle speed, whereby the quantities of the secondary fuel and the secondary air are regulated in at least five stages, i.e. the stage in which the temperature of the combustion chamber rises to the normal reaction temperature and the engine is quickly accelerated after the engine has been started, the stage in which the engine is in the idling phase after the temperature of the combustion chamber has reached the normal reaction temperature, the stage in which the engine is decelerated, the stage in which the temperature of the combustion chamber rises to an excessively high level and the stage in which the engine is in other operating phases, characterized in that, said combustion chamber comprises a head chamber having a central opening around which a porous body is provided, said central opening is adapted for letting the secondary fuel and a portion of the secondary air go through into said head chamber enhancing the atomization of said fuel by said portion of air, said porous body is adapted for evaporating said secondary fuel from the surface thereof being supplied with secondary fuel independently of said secondary fuel to be atomized, the remaining portion of said secondary air is blown into said head chamber in a tangential direction thereof, said exhaust gases, are introduced into a portion of said combustion chamber other than the portion of said head chamber in a tangential direction of said combustion chamber.

Claim 8

An exhaust gas cleaning device for cleaning the exhaust gases of an engine mounted on a vehicle by burning said exhaust gases in an exhaust gas combustion chamber, provided intermediate of the exhaust pipe of the engine with secondary fuel and secondary air supplied to said combustion chamber, said device comprising said combustion chamber for re-burning the exhaust gases being led into the exhaust pipe of the engine, means for supplying the secondary air into said combustion chamber for re-burning the exhaust gases, first valve means for regulating the quantity of the secondary air supplied to the combustion chamber, means for supplyiNg the secondary fuel into the combustion chamber for re-burning the exhaust gases, second valve means for regulating the quantity of the secondary fuel and means for operating said first and second valve means according to the temperature of said exhaust gas combustion chamber, the suction vacuum of the engine and the vehicle speed, whereby the quantities of the secondary fuel and the secondary air are regulated in at least five stages, i.e. the stage in which the temperature of the combustion chamber rises to the normal reaction temperature and the engine is quickly accelerated after the engine has been started, the stage in which the engine is in the idling phase after the temperature of the combustion chamber has reached the normal reaction temperature, the stage in which the engine is decelerated, the stage in which the temperature of the combustion chamber rises to an excessively high level and the stage in which the engine is in other operating phases, characterized in that, said combustion chamber comprises a head chamber having a central opening around which a porous body is provided, said central opening is adapted for letting the secondary fuel and a portion of the secondary air go through into said head chamber enhancing the atomization of said fuel by said portion of air, said porous body is adapted for evaporating said secondary fuel from the surface thereof being supplied with secondary fuel independently of said secondary fuel to be atomized, the remaining portion of said secondary air is blown into said head chamber in a tangential direction thereof, said exhaust gases, are introduced into a portion of said combustion chamber other than the portion of said head chamber in a tangential direction of said combustion chamber.

Claim 9

An exhaust gas cleaning device as claimed in claim 5, wherein a heat accumulator is disposed in said combustion chamber, which when red heated provides an ignition source for the exhaust gas.

Claim 10

An exhaust gas cleaning device as defined in claim 5, characterized in that said first valve means for regulating the quantity of the secondary air includes a first valve for opening and closing a passage leading from said air supply means to said central opening and a tangentially orientated port provided at said head chamber, a second valve for closing said passage to release the air into the atmosphere, and a third valve having apertures formed therein and located at the downstream of said first valve, and operation of said valves are controlled by said controlling means according to the temperature of said combustion chamber, the suction vacuum in the intake pipe and the vehicle speed, whereby while the temperature of the combustion chamber rises to the normal reaction temperature and while the engine is idling, cruising and quickly accelerated, said first and third valves are opened with said second valves being closed to supply a large quantity of air into said head chamber, and while the engine is decelerated said first valve is opened with said second and third valve being closed to supply a small quantity of air into said head chamber through the apertures formed in said third valve, whereas when the combustion chamber is overheated, said first valve is closed and said second valve is opened to release the air into atmosphere; and characterized in that said second valve means for regulating the quantity of the secondary fuel includes a first valve for opening and closing a passage leading from said means for supplying the secondary fuel to said central aperture, a second valve for opening and closing a passage leading from said means for supplying the secondary fuel to said porous body and a third valve which is adapted for opening and closing another passage leading from said means for supplying the secondary fuel to said porous body, and the operation of said valves of the second valve means are controlled by said controlling means according to the temperature of the combustion chamber, the suction vacuum of the enGine and the vehicle speed, whereby while the temperature of the combustion chamber rises to the normal reaction temperature and while the engine is quickly accelerated said first and second and third valves are opened to supply a large quantity of the second fuel into said combustion chamber, while the engine is idling and decelerated said first and second valves are closed with said third valve being opened to supply minimum quantity of the second fuel only to said porous body, while the engine is in cruising condition said first valve is closed with said second and third valves being opened to supply a proper quantity of second fuel only to said porous body, whereas then the combustion chamber is overheated said three valves are all closed to shut the second fuel off.

Claim 11

An exhaust gas cleaning device as claimed in claim 7, wherein a heat accumulator is disposed in said combustion chamber, which when red heated provides an ignition source for the exhaust gas.

Claim 12

An exhaust gas cleaning device for cleaning the exhaust gases of an engine mounted on a vehicle by burning said exhaust gases in an exhaust gas combustion chamber, provided intermediate of the exhaust pipe of the engine with secondary fuel and secondary air supplied to said combustion chamber, said device comprising said combustion chamber for re-burning the exhaust gases being led into the exhaust pipe of the engine, means for supplying the secondary air into said combustion chamber for re-burning the exhaust gases, first valve means for regulating the quantity of the secondary air supplied to the combustion chamber, means for supplying the secondary fuel into the combustion chamber for re-burning the exhaust gases, second valve means for regulating the quantity of the secondary fuel and means for operating said first and second valve means according to the temperature of said exhaust gas combustion chamber, the suction vacuum of the engine and vehicle speed, whereby the quantities of the secondary fuel and the secondary air are regulated in at least five stages, i.e. the stage in which the temperature of the combustion chamber rises to the normal reaction temperature and the engine is quickly accelerated after the engine has been started, the stage in which the engine is in the idling phase after the temperature of the combustion chamber has reached the normal reaction temperature, the stage in which the engine is decelerated, the stage in which the temperature of the combustion chamber rises to an excessively high level and the stage in which the engine is in other operating phases, characterized in that said first valve means for regulating the quantity of the secondary air includes a first valve for opening and closing a passage leading from said air supply means to said combustion chamber, a second valve for closing said passage to release the air into the atmosphere and a third valve having apertures formed therein and located at the downstream of said first valve, and the operations of said valves are controlled by said controlling means according to the temperature of the combustion chamber, the suction vacuum in the intake pipe and the vehicle speed, whereby while the temperature of the combustion chamber rises to the normal reaction temperature and while the engine is idling, cruising and quickly accelerated after the engine has been warmed up, said first and third valves are opened and said second valve is closed to supply a large quantity of air into said combustion chamber, and while the engine is decelerated said first valve is opened and said second and third valves are closed to supply a small quantity of air into said combustion chamber through the apertures formed in said third valve, whereas when the combustion chamber is overheated, said first valve is closed and said second valve is opened to release the air into the atmosphere.

Claim 13

An exhaust gas cleaning device for cleaning the exhaust gases of an engine mounted on a vehicle by burning said exhaust gases in an exhaust gas combustion chamber, provided intermediate of the exhaust pipe of the engine with secondary fuel and secondary air supplied to said combustion chamber, said device comprising said combustion chamber for re-burning the exhaust gases being led into the exhaust pipe of the engine, means for supplying the secondary air into said combustion chamber for re-burning the exhaust gases, first valve means for regulating the quantity of the secondary air supplied to the combustion chamber, means for supplying the secondary fuel into the combustion chamber for re-burning the exhaust gases, second valve means for regulating the quantity of the secondary fuel and means for operating said first and second valve means according to the temperature of said exhaust gas combustion chamber, the suction vacuum of the engine and vehicle speed, whereby the quantities of the secondary fuel and the secondary air are regulated in at least five stages, i.e. the stage in which the temperature of the combustion chamber rises to the normal reaction temperature and the engine is quickly accelerated after the engine has been started, the stage in which the engine is in the idling phase after the temperature of the combustion chamber has reached the normal reaction temperature, the stage in which the engine is decelerated, the stage in which the temperature of the combustion chamber rises to an excessively high level and the stage in which the engine is in other operating phases, characterized in that said first valve means for regulating the quantity of the secondary air includes a first valve for opening and closing a passage leading from said air supply means to said combustion chamber, a second valve for closing said passage to release the air into the atmosphere and a third valve having apertures formed therein and located at the downstream of said first valve, and the operations of said valves are controlled by said controlling means according to the temperature of the combustion chamber, the suction vacuum in the intake pipe and the vehicle speed, whereby while the temperature of the combustion chamber rises to the normal reaction temperature and while the engine is idling, cruising and quickly accelerated after the engine has been warmed up, said first and third valves are opened and said second valve is closed to supply a large quantity of air into said combustion chamber, and while the engine is decelerated said first valve is opened and said second and third valves are closed to supply a small quantity of air into said combustion chamber through the apertures formed in said third valve, whereas when the combustion chamber is overheated, said first valve is closed and said second valve is opened to release the air into the atmosphere.

Claim 14

An exhaust gas cleaning device as defined in claim 9, characterized in that said second valve means for Regulating the quantity of the secondary fuel includes a first valve for opening and closing a passage leading from said means for supplying the secondary fuel to said combustion chamber, a second valve for opening and closing a passage leading from said means for supplying the secondary fuel to a porous body provided within said combustion chamber, and a third valve which is adapted for opening and closing another passage communicating said means for supplying the secondary fuel to said porous body, and the operations of said valves of the second valve means are controlled by said controlling means according to the temperature of the combustion chamber, the suction vacuum of the engine and the vehicle speed, whereby while the temperature of the combustion chamber rises to the normal reaction temperature and the engine is quickly accelerated, said first and second and the third valves are opened to supply a large quantity of the second fuel into said combustion chamber, while the engine is idling and decelerated said first and second valves are closed with said third valve being opened to supply minimum quantity of the second fuel only to said porous body, while the engine is in cruising condition said first valve is closed with said second and said third valves being opened to supply a proper quantity of second fuel only to said porous body, whereas when the combustion chamber is overheated said three valves are all closed to shut the second fuel off.