Exhaust gas recirculation measurement device

An exhaust gas recirculation (EGR) measurement device for recirculating at least a portion of exhaust gas of an internal combustion engine, said at least a portion of exhaust gas flowing in a forward direction in said EGR measurement device to an intake of the internal combustion engine, and a reverse direction opposite to said forward direction, said EGR measurement device comprising:

• an exhaust gas inlet section having a substantially cylindrical shape;
• a first tap in fluidic communication with said exhaust gas inlet section to allow measurement of a first pressure indicative of pressure of said exhaust gas in said exhaust gas inlet section;
• a convergent cone section connected to said exhaust gas inlet section, said convergent cone section including a cone inlet, a throat portion, and a cone outlet that is radially smaller than said cone inlet;
• a second tap positioned downstream of said first tap to allow measurement of a second pressure indicative of pressure of said exhaust gas downstream of said first tap;
• a diffuser section connected to said cone outlet, said diffuser section including a diffuser inlet, and a diffuser outlet that is radially larger than said diffuser inlet;
• and
• an extension portion that extends substantially over said second tap to define an alcove that is fluidically open in said forward direction, said alcove allowing accurate measurement of exhaust gas flow based on said first pressure and said second pressure when said exhaust gas flows in said reverse direction.

An exhaust gas recirculation (EGR) measurement device for recirculating at least a portion of exhaust gas of an internal combustion engine, said at least a portion of exhaust gas flowing in a forward direction in said EGR measurement device to an intake of the internal combustion engine, and a reverse direction opposite to said forward direction, said EGR measurement device comprising:

• an exhaust gas inlet section having a substantially cylindrical shape;
• a first tap in fluidic communication with said exhaust gas inlet section to allow measurement of a first pressure indicative of pressure of said exhaust gas in said exhaust gas inlet section;
• a convergent cone section connected to said exhaust gas inlet section, said convergent cone section including a cone inlet, a throat portion, and a cone outlet that is radially smaller than said cone inlet;
• a pitot tube positioned at substantially center of said throat portion of said convergent cone section, said pitot tube having an opening fluidically open in said forward direction to allow measurement of a second pressure indicative of pressure of said exhaust gas in said throat portion of said convergent cone section, said pitot tube allowing accurate measurement of exhaust gas flow based on said first pressure and said second pressure when said exhaust gas flows in said reverse direction;
• and
• a diffuser section connected to said cone outlet, said diffuser section including a diffuser inlet, a divergent conical portion, and a diffuser outlet that is radially larger than said diffuser inlet.

An exhaust gas recirculation (EGR) measurement device for recirculating at least a portion of exhaust gas of an internal combustion engine, said at least a portion of exhaust gas flowing in a forward direction in said EGR measurement device to an intake of the internal combustion engine, and a reverse direction opposite to said forward direction, said EGR measurement device comprising:

• an exhaust gas inlet section having a substantially cylindrical shape;
• a convergent cone section connected to said exhaust gas inlet section, said convergent cone section including a cone inlet, a throat portion, and a cone outlet that is radially smaller than said cone inlet;
• a first pitot tube positioned at substantially center of said throat portion of said convergent cone section, said first pitot tube having an opening fluidically open in said reverse direction to allow measurement of a first pressure;
• second pitot tube positioned at substantially center of said throat portion of said convergent cone section, said second pitot tube having an opening fluidically open in said forward direction to allow measurement of a second pressure to allow accurate measurement of exhaust gas flow based on said first pressure and said second pressure when said exhaust gas flows in said reverse direction;
• and
• a diffuser section connected to said cone outlet, said diffuser section including a diffuser inlet, a divergent conical portion, and a diffuser outlet that is radially larger than said diffuser inlet.