Exhaust gas recirculation control

Claim 2

An internal combustion engine comprising an induction passage for air flow to the engine, an exhaust passage for exhaust gas flow from the engine, opening means connecting said exhaust passage and said induction passage for recirculation of exhaust gases from said exhaust passage to said induction passage, a control valve in said opening means movable to various positions for varying the exhaust gas flow area therethrough to thereby control recirculation of exhaust gases, an air valve in said induction passage movable to various positions for varying the air flow area therethrough, means positioning said air valve to maintain a substantially constant pressure differential thereacross whereby the position of said air valve is a measure of the rate of air flow throUgh said induction passage, and means linking said air valve and said control valve for simultaneous movement whereby the position of said control valve is determined by the rate of air flow through said induction passage and recirculation of exhaust gases is appropriately controlled in accordance therewith.

Claim 3

An internal combustion engine comprising 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, opening means connecting said exhaust passage and said induction passage downstream of said throttle for recirculation of exhaust gases from said exhaust passage to said induction passage, a control valve in said opening means movable to various positions for varying the exhaust gas flow area therethrough to thereby control recirculation of exhaust gases, an air valve disposed in said induction passage downstream of said throttle and movable to various positions for varying the air flow area therethrough, means positioning said air valve to maintain a substantially constant pressure differential thereacross whereby the position of said air valve is a measure of the rate of air flow through said induction passage, and means linking said air valve and said control valve for simultaneous movement whereby the position of said control valve is determined by the rate of air flow through said induction passage and recirculation of exhaust gases is appropriately controlled in accordance therewith.

Claim 4

An internal combustion engine comprising 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, opening means connecting said exhaust passage and said induction passage downstream of said throttle for recirculation of exhaust gases from said exhaust passage to said induction passage, a control valve in said opening means movable to various positions for varying the exhaust gas flow area therethrough to thereby control recirculation of exhaust gases, an air valve disposed in said induction passage downstream of said throttle and movable to various positions for varying the air flow area therethrough, means positioning said air valve to maintain a substantially constant pressure differential thereacross whereby the position of said air valve is a measure of the rate of air flow through said induction passage, and means linking said air valve and said control valve for simultaneous movement whereby the position of said control valve is determined by the rate of air flow through said induction passage and recirculation of exhaust gases is appropriately controlled in accordance therewith.

Claim 5

An internal combustion engine comprising an induction passage for air flow to the engine, said induction passage including a plenum chamber and a riser bore opening into said plenum chamber at the juncture therebetween an exhaust passage for exhaust gas flow from the engine, opening means connecting said exhaust passage and said induction passage for recirculation of exhaust gases from said exhaust passage to said induction passage, a control valve in said opening means movable to various positions for varying the exhaust gas flow area therethrough to thereby control recirculation of exhaust gases, an air valve in the form of a flat disc member disposed in said induction passage at said juncture and reciprocable to various positions for varying the air flow area therethrough, means positioning said disc member to maintain a substantially constant pressure differential thereacross whereby the position of said disc member is a measure of the rate of air flow through said induction passage, and means linking said disc member and said control valve for simultaneous movement whereby the position of said control valve is determined by the rate of air flow through said induction passage and recirculation of exhaust gases is appropriately controlled in accordance therewith.

Claim 6

An internal combustion engine comprising an induction passage for air flow to the engine, said induction passage including a plenum chamber and a riser bore opening into said plenum chamber at the juncture therebetween an exhaust passage for exhaust gas flow from the engine, opening means connecting said exhaust passage and said induction passage for recirculation of exhaust gases from said exhaust passage to said induction passage, a control valve in said opening means movable to various positions for varying the exhaust gas flow area therethrough to thereby control recirculation of exhaust gases, an air valve in the form of a flat disc member disposed in said induction passage at said juncture and reciprocable to various positions for varying the air flow area therethrough, means positioning said disc member to maintain a substantially constant pressure differential thereacross whereby the position of said disc member is a measure of the rate of air flow through said induction passage, and means linking said disc member and said control valve for simultaneous movement whereby the position of said control valve is determined by the rate of air flow through said induction passage and recirculation of exhaust gases is appropriately controlled in accordance therewith.

Claim 7

An internal combustion engine comprising an induction passage for air flow to the engine, said induction passage including a plenum chamber and a riser bore opening into said plenum chamber at the juncture therebetween, an exhaust passage for exhaust gas flow from the engine, opening means connecting said exhaust passage and said plenum chamber for recirculation of exhaust gases from said exhaust passage to said induction passage, said opening means being coaxial with said riser bore, an orifice member disposed in said opening means, a control valve pintle reciprocable in said orifice member for varying the exhaust gas flow area therethrough to thereby control recirculation of exhaust gases, a flat disc member disposed in said induction passage at said juncture and reciprocable to various positions for varying the air flow area therethrough, spring means biasing said disc member toward said riser bore and positioning said disc member to maintain a substantially constant pressure differential thereacross whereby the position of said disc member is a measure of the rate of air flow through said induction passage, and a stem linking said disc member and said pintle for simultaneous movemenT whereby the position of said pintle is determined by the rate of air flow through said induction passage and recirculation of exhaust gases is appropriately controlled in accordance therewith.

Claim 8

An internal combustion engine comprising an induction passage for air flow to the engine, said induction passage including a plenum chamber and a riser bore opening into said plenum chamber at the juncture therebetween, an exhaust passage for exhaust gas flow from the engine, opening means connecting said exhaust passage and said plenum chamber for recirculation of exhaust gases from said exhaust passage to said induction passage, said opening means being coaxial with said riser bore, an orifice member disposed in said opening means, a control valve pintle reciprocable in said orifice member for varying the exhaust gas flow area therethrough to thereby control recirculation of exhaust gases, a flat disc member disposed in said induction passage at said juncture and reciprocable to various positions for varying the air flow area therethrough, spring means biasing said disc member toward said riser bore and positioning said disc member to maintain a substantially constant pressure differential thereacross whereby the position of said disc member is a measure of the rate of air flow through said induction passage, and a stem linking said disc member and said pintle for simultaneous movemenT whereby the position of said pintle is determined by the rate of air flow through said induction passage and recirculation of exhaust gases is appropriately controlled in accordance therewith.

Claim 9

An internal combustion engine comprising an induction passage for air flow to the engine, a throttle disposed in said induction passage for controlling air flow therethrough, said induction passage including a plenum chamber downstream of said throttle and a riser bore extending from said throttle and said plenum chamber at the juncture therebetween, an exhaust passage for exhaust gas flow from the engine, opening means connecting said exhaust passage and said plenum chamber for recirculation of exhaust gases from said exhaust passage to said induction passage, said opening means being coaxial with said riser bore, an orifice member disposed in said opening means, a control valve pintle reciprocable in said orifice member for varying the exhaust gas flow area therethrough to thereby control recirculation of exhaust gases, a flat disc member disposed in said induction passage at said juncture and reciprocable to various positions for varying the air flow area therethrough, spring means biasing said disc member toward said riser bore and positioning said disc member to maintain a substantially constant pressure differential thereacross whereby the position of said disc member is a measure of the rate of air flow through said induction passage, and a stem linking said disc member and said pintle for simultaneous movement whereby the position of said pintle is determined by the rate of air flow through said induction passage and recirculation of exhaust gases is appropriately controlled in accordance therewith.

Claim 10

An internal combustion engine comprising an induction passage for air flow to the engine, a throttle disposed in said induction passage for controlling air flow therethrough, said induction passage including a plenum chamber downstream of said throttle and a riser bore extending from said throttle and said plenum chamber at the juncture therebetween, an exhaust passage for exhaust gas flow from the engine, opening means connecting said exhaust passage and said plenum chamber for recirculation of exhaust gases from said exhaust passage to said induction passage, said opening means being coaxial with said riser bore, an orifice member disposed in said opening means, a control valve pintle reciprocable in said orifice member for varying the exhaust gas flow area therethrough to thereby control recirculation of exhaust gases, a flat disc member disposed in said induction passage at said juncture and reciprocable to various positions for varying the air flow area therethrough, spring means biasing said disc member toward said riser bore and positioning said disc member to maintain a substantially constant pressure differential thereacross whereby the position of said disc member is a measure of the rate of air flow through said induction passage, and a stem linking said disc member and said pintle for simultaneous movement whereby the position of said pintle is determined by the rate of air flow through said induction passage and recirculation of exhaust gases is appropriately controlled in accordance therewith.