§
Luxuse
Patent Intelligence
Sign In
← Back to Patent Explorer
US4249503A Expired / Lapsed US ⏱️ 0.0 years remaining

Exhaust gas recirculation for engine

Assignee: Honda Motor Co Ltd
•
Filing: 1979-08-27
•
Granted: 1981-02-10
•
Expires: 1999-08-27
📄 Original PDF 🌐 Google Patents 🔄 Sync Now

Abstract

Abstract An exhaust gas recirculation system for an internal combustion engine employs an exhaust gas recirculation control valve in a passageway connecting the engine exhaust passage to the engine intake passage downstream from the throttle valve. The intake passage also provides a choke valve and a carburetor venturi section between the valves. An air conduit having an air control valve therein connects the intake passage between the throttle valve and the choke valve to the intake passage downstream from the throttle valve. Vacuum responsive actuators are provided for each of the control valves and they are operated by vacuum pressure regulated by a regulating valve, which is itself responsive to differential pressure between vacuum intensity in the intake passage upstream from said throttle valve and modified atmospheric pressure. The modified atmospheric pressure is obtained downstream of a restriction in the air conduit. Closing of the choke valve on a cold start of the engine causes high vacuum intake to the air conduit, reducing the exhaust gas recirculation through the exhaust gas recirculation control valve.

Inventors

  • 👤 Takeshi Noguchi
  • 👤 Hiroyuki Nishimura
  • 👤 Takashi Umemoto

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-31 17:57
CPC Classifications
F; F02; F02M; F02M23/00; F02M23/04; F02M23/08; F02M23/09; F02M26/00; F02M26/52; F02M26/55; F02M26/56; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12

Claims Analysis

Total Claims: 2
Claim 1
Independent Claim 233 words
In an internal combustion engine having an intake passage for delivering an air-fuel mixture into the engine, a throttle valve in the intake passage, a choke valve in the intake passage, and an exhaust passage for carrying exhaust gases from the engine, the improvement comprising, in combination: a passageway connecting the exhaust passage to the intake passage downstream from the throttle valve for recirculating exhaust gases into said engine, an exhaust gas recirculation control valve in said passageway, an air conduit connecting said intake passage downstream from said throttle to the intake passage downstream of the choke valve, an air control valve in said air conduit, said air conduit having a restriction device located between its upper opening and said air control valve, a branch conduit connected to said air conduit between said restriction device and air control valve, a regulating valve in said branch conduit, each of said two control valves and said regulating valve having a vacuum responsive actuator, a vacuum line connected to said intake passage upstream from said throttle valve, said regulating valve responsive to differential pressure between vacuum pressure in said vacuum line and vacuum pressure in said air conduit, a control pipe system connecting said vacuum responsive actuators to said intake passage near said throttle valve, means whereby said regulating valve acts through said control pipe system to act upon vacuum responsive actuators for said control valves.
Claim 2
Dependent Claim 233 words
In an internal combustion engine having an intake passage for delivering an air-fuel mixture into the engine, a throttle valve in the intake passage, a choke valve in the intake passage, and an exhaust passage for carrying exhaust gases from the engine, the improvement comprising, in combination: a passageway connecting the exhaust passage to the intake passage downstream from the throttle valve for recirculating exhaust gases into said engine, an exhaust gas recirculation control valve in said passageway, an air conduit connecting said intake passage downstream from said throttle to the intake passage downstream of the choke valve, an air control valve in said air conduit, said air conduit having a restriction device located between its upper opening and said air control valve, a branch conduit connected to said air conduit between said restriction device and air control valve, a regulating valve in said branch conduit, each of said two control valves and said regulating valve having a vacuum responsive actuator, a vacuum line connected to said intake passage upstream from said throttle valve, said regulating valve responsive to differential pressure between vacuum pressure in said vacuum line and vacuum pressure in said air conduit, a control pipe system connecting said vacuum responsive actuators to said intake passage near said throttle valve, means whereby said regulating valve acts through said control pipe system to act upon vacuum responsive actuators for said control valves.

References Cited (Backward Citations)

US3739797A Cited
US3884200A Cited
US3818880A Cited
US3779222A Cited
US3915136A Cited
US3970061A Cited
US4033308A Cited
GB1486093A Cited
GB1486651A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1984-02-10 1984-08-11 1985-02-10 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1988-02-10 1988-08-11 1989-02-10 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1992-02-10 1992-08-11 1993-02-10 $7700.00 Window Closed / Lapsed

Assigned Categories & Tags

No categories assigned to this patent yet.

Assign Category Tag