Exhaust gas recirculation valve

Claim 2

An exhaust gas recirculation control valve assembly for use on an internal combustion engine having an induction passage for air flow to the engine, a throttle disposed in said induction passage for controlling air flow therethrough, an exhaust passage for exhaust gas flow from the engine, and an exhaust gas recirculation passage having a first portion extending from said exhaust passage and a second portion extending to said induction passage downstream of said throttle, said control valve assembly comprising a valve body having an inlet for receiving exhaust gases from said first portion of said recirculation passage, an outlet for discharging exhaust gases to said second portion of said recirculation passage, a valve seat formed between said inlet and said outlet, a valve pintle associated with said valve Seat for controlling flow of exhaust gases therethrough, a valve stem extending from said pintle, a pressure responsive diaphragm connected to said valve stem, a cover associated with said diaphragm to form an enclosed chamber, and a passage extending from said chamber through said stem to an opening adjacent said pintle to thereby subject said diaphragm to exhaust gas pressure whereby said diaphragm positions said pintle to control the flow of exhaust gases through said valve seat in accordance with exhaust gas pressure, said opening having the smallest flow area of any location in said passage to thereby dampen exhaust gas pressure pulsations and prevent undue vibration of said diaphragm and valve pintle.

Claim 3

An exhaust gas recirculation control valve assembly for use on an internal combustion engine having an induction passage for air flow to the engine, a throttle disposed in said induction passage for controlling air flow therethrough, an exhaust passage for exhaust gas flow from the engine, and an exhaust gas recirculation passage having a first portion extending from said exhaust passage and a second portion extending to said induction passage downstream of said throttle, said control valve assembly comprising a valve body having an inlet for receiving exhaust gases from said first portion of said recirculation passage, an outlet for discharging exhaust gases to said second portion of said recirculation passage, a valve seat formed between said inlet and said outlet, a valve pintle associated with said valve seat for controlling flow of exhaust gases therethrough, a valve stem extending from said pintle, a pressure responsive diaphragm connected to said valve stem, a cover associated with said diaphragm to form an enclosed chamber, means exposing said chamber to exhaust gas pressure whereby said diaphragm positions said pintle to control the flow of exhaust gases through said valve seat in accordance with exhaust gas pressure, and a perforate member disposed intermediate said cover and said diaphragm to prevent any ice formed adjacent said cover from dislodging against said diaphragm.

Claim 4

An exhaust gas recirculation control valve assembly for use on an internal combustion engine having an induction passage for air flow to the engine, a throttle disposed in said induction passage for controlling air flow therethrough, an exhaust passage for exhaust gas flow from the engine, and an exhaust gas recirculation passage having a first portion extending from said exhaust passage and a second portion extending to said induction passage downstream of said throttle, said control valve assembly comprising a valve body having an inlet for receiving exhaust gases from said first portion of said recirculation passage, an outlet for discharging exhaust gases to said second portion of said recirculation passage, a valve seat formed between said inlet and said outlet, a valve pintle associated with said valve seat for controlling flow of exhaust gases therethrough, a valve stem extending from said pintle, a pressure responsive diaphragm connected to said valve stem, a cover associated with said diaphragm to form an enclosed chamber, means exposing said chamber to exhaust gas pressure whereby said diaphragm positions said pintle to control the flow of exhaust gases through said valve seat in accordance with exhaust gas pressure, and a perforate member disposed intermediate said cover and said diaphragm to prevent any ice formed adjacent said cover from dislodging against said diaphragm.

Claim 5

The valve assembly of claim 2 wherein said perforate member comprises a sheet metal member secured to said cover and having a multiplicity of holes formed therein.

Claim 6

An exhaust gas recirculation control valve assembly for use on an internal combustion engine having an induction passage for air flow to the engine, a throttle disposed in said induction passage for controlling air flow therethrough, an exhaust passage for exhaust gas flow from the engine, and an exhaust gas recirculation passage having a first portion extending from said exhaust passage and a second portion extending to said induction passage downstream of said throttle, said control valve assembly comprising a valve body having an inlet for receiving exhaust gases from said first portion of said recirculation passage, an outlet for discharging exhaust gases to said second portion of said recirculation passage, a valve seat formed between said inlet and said outlet, a valve pintle associated with said valve seat for controlling flow of exhaust dampen therethrough, a valve stem extending from said pintle, a pressure responsive diaphragm connected to said valve stem, a pressure responsive diaphragm connected to said valve stem, a cover associated with said diaphragm to form an enclosed chamber, a passage extending from said chamber through said stem to an opening adjacent said pintle to thereby subject said diaphragm to exhaust gas pressure whereby said diaphragm positions said pintle to control the flow of exhaust gases through said valve seat in accordance with exhaust gas pressure, said opening having the smallest flow area of any location in said passage to thereby dampe exhaust gas pressure pulsations and prevent undue vibration of said diaphragm and valve pintle, and a sheet metal member secured to said cover and having a multiplicity of holes formed therein, said member preventing any ice formed on said cover from dIslodging against said diaphragm.

Claim 7

An exhaust gas recirculation control valve assembly for use on an internal combustion engine having an induction passage for air flow to the engine, a throttle disposed in said induction passage for controlling air flow therethrough, an exhaust passage for exhaust gas flow from the engine, and an exhaust gas recirculation passage having a first portion extending from said exhaust passage and a second portion extending to said induction passage downstream of said throttle, said control valve assembly comprising a valve body having an inlet for receiving exhaust gases from said first portion of said recirculation passage, an outlet for discharging exhaust gases to said second portion of said recirculation passage, a valve seat formed between said inlet and said outlet, a valve pintle associated with said valve seat for controlling flow of exhaust dampen therethrough, a valve stem extending from said pintle, a pressure responsive diaphragm connected to said valve stem, a pressure responsive diaphragm connected to said valve stem, a cover associated with said diaphragm to form an enclosed chamber, a passage extending from said chamber through said stem to an opening adjacent said pintle to thereby subject said diaphragm to exhaust gas pressure whereby said diaphragm positions said pintle to control the flow of exhaust gases through said valve seat in accordance with exhaust gas pressure, said opening having the smallest flow area of any location in said passage to thereby dampe exhaust gas pressure pulsations and prevent undue vibration of said diaphragm and valve pintle, and a sheet metal member secured to said cover and having a multiplicity of holes formed therein, said member preventing any ice formed on said cover from dIslodging against said diaphragm.

Claim 8

An exhaust gas recirculation control valve assembly for use on an internal combustion engine having an induction passage for air flow to the engine, a throttle disposed in said induction passage for controlling air flow therethrough, an exhaust passage for exhaust gas flow from the engine, and an exhaust gas recirculation passage having a first portion extending from said exhaust passage and a second portion extending to said induction passage downstream of said throttle, said control valve assembly comprising a valve body having an inlet for receiving exhaust gases from said first portion of said recirculation passage, an outlet for discharging exhaust gases to said second portion of said recirculation passage, a valve seat formed between said inlet and said outlet, a valve pintle associated with said valve seat for controlling flow of exhaust gases therethrough, a valve stem extending from said pintle, a pressure responsive operating member connected to said valve stem, means associated with said operating member to form an enclosed chamber, and a passage extending from said chamber through said stem to an opening adjacent said pintle to thereby subject said chamber to exhaust gas pressure whereby said operating member positions said pintle to control the flow of exhaust gases through said valve seat in accordance with exhaust gas pressure, said opening having the smallest flow area of any location in said passage to thereby dampen exhaust gas pressure pulsations and prevent undue vibration in said valve assembly.

Claim 9

An exhaust gas recirculation control valve assembly for use on an internal combustion engine having an induction passage for air flow to the engine, a throttle disposed in said induction passage for controlling air flow therethrough, an exhaust passage for exhaust gas flow from the engine, and an exhaust gas recirculation passage having a first portion extending from said exhaust passage and a second portion extending to said induction passage downstream of said throttle, said control valve assembly comprising a valve body having an inlet for receiving exhaust gases from said first portion of said recirculation passage, an outlet for discharging exhaust gases to said second portion of said recirculation passage, a valve seat formed between said inlet and said outlet, a valve pintle associated with said valve seat for controlling flow of exhaust gases therethrough, a valve stem extending from said pintle, a pressure responsive operating member connected to said valve stem, means associated with said operating member to form an enclosed chamber, and a passage extending from said chamber through said stem to an opening adjacent said pintle to thereby subject said chamber to exhaust gas pressure whereby said operating member positions said pintle to control the flow of exhaust gases through said valve seat in accordance with exhaust gas pressure, said opening having the smallest flow area of any location in said passage to thereby dampen exhaust gas pressure pulsations and prevent undue vibration in said valve assembly.