Exhaust gas recycling system

Claim 2

In an exhaust gas recycling system for an internal combustion engine having an intake system for introducing a fuel-air mixture into said engine, an exhaust system for discharging exhaust gases from said engine to the atmosphere, a recycling pipe connected to both said intake system and said exhaust system, and means for modifying the volume of the recycling exhaust gas through said recycling pipe responsive to changes in the pressure in an intake manifold of said inlet system, including means for sensing the intake manifold pressure, the improvement that comprises a sensing means including; a diaphragm chamber, a diaphragm positioned in said diaphragm chamber, an induction pipe connected to both said intake manifold and said diaphragm chamber through which the pressure in said intake manifold propagates to said diaphragm chamber, and means for retarding the propagation of the intake manifOld pressure to said diaphragm chamber, said retarding means comprising: a wall installed in said induction pipe for closing said induction pipe, said wall having therein two holes through which said diaphragm chamber is communicated to said intake manifold, and a normally closed check valve means disposed in said wall at one of said holes, said check valve means being adapted to open said hole when the pressure in said diaphragm chamber is higher than that in said intake manifold, the other of said holes being open.

Claim 3

The exhaust gas recycling system in claim 1, wherein said check valve means comprises: a flexible plate fixed on said wall at some part thereof inside said chamber, normally closing said hole, said flexible plate being adapted to bend to open said hole when the pressure in said diaphragm chamber is higher than that in said intake manifold.

Claim 4

In an exhaust gas recycling system for an internal combustion engine having an intake system for introducing a fuel-air mixture into said engine, an exhaust system for discharging exhaust gases from said engine to the atmosphere, a recycling pipe connected to both said intake system and said exhaust system, and means for modifying the volume of the recycling exhaust gas through said recycling pipe responsive to changes in the pressure in an intake manifold of said inlet system, including means for sensing the intake manifold pressure, the improvement that comprises a sensing means including; a diaphragm chamber, a diaphragm positioned in said diaphragm chamber, an induction pipe connected to both said intake manifold and said diaphragm chamber, and extending into said diaphragm chamber, through which the pressure in said intake manifold propagates to said diaphragm chamber, and means for retarding the propagation of the intake manifold pressure to said diaphragm chamber attached at the end of said induction pipe in said diaphragm chamber, said retarding means comprising: a second chamber communicated to said intake manifold, said chamber having in a wall thereof two holes through which said second chamber communicates with said diaphragm chamber; and a normally closed check valve means disposed in a wall of said second chamber at one of said holes, said check valve means being adapted to open said hole when the pressure in said diaphragm chamber is higher than that in said intake manifold.

Claim 5

In an exhaust gas recycling system for an internal combustion engine having an intake system for introducing a fuel-air mixture into said engine, an exhaust system for discharging exhaust gases from said engine to the atmosphere, a recycling pipe connected to both said intake system and said exhaust system, and means for modifying the volume of the recycling exhaust gas through said recycling pipe responsive to changes in the pressure in an intake manifold of said inlet system, including means for sensing the intake manifold pressure, the improvement that comprises a sensing means including; a diaphragm chamber, a diaphragm positioned in said diaphragm chamber, an induction pipe connected to both said intake manifold and said diaphragm chamber, and extending into said diaphragm chamber, through which the pressure in said intake manifold propagates to said diaphragm chamber, and means for retarding the propagation of the intake manifold pressure to said diaphragm chamber attached at the end of said induction pipe in said diaphragm chamber, said retarding means comprising: a second chamber communicated to said intake manifold, said chamber having in a wall thereof two holes through which said second chamber communicates with said diaphragm chamber; and a normally closed check valve means disposed in a wall of said second chamber at one of said holes, said check valve means being adapted to open said hole when the pressure in said diaphragm chamber is higher than that in said intake manifold.

Claim 6

The exhaust gas recycling system in claim 3, wherein said check valve means comprises: a flexible plate fixed on said wall at some part thereof inside said second chamber, normally closing said hole, said flexible plate being adapted to bend to open said hole when the pressure in said diaphragm chamber is higher than that in said intake manifold.