PRIMARY AIR SUPPLYING MEANS FOR AN INTAKE SYSTEM OF INTERNAL COMBUSTION ENGINE

• US 3,752,131 A
• Filed: 06/03/1971
• Issued: 08/14/1973
• Est. Priority Date: 06/04/1970
• Status: Expired due to Term

• Current Assignee: Koso Iida, Terutoshi Tsumura
• Original Assignee: Koso Iida, Terutoshi Tsumura
• Inventors: Tsumura, Terutoshi, Iida, Koso
• Primary Examiner(s): Goodridge, Laurence M.
• Assistant Examiner(s): Cox, Ronald B.
• Application Number:
  US05/149,543
• Time in Patent Office: 803 Days
• Field of Search: 123/97B,119D 261/DIG.19,117A
• US Class Current: 123/327
• CPC Class Codes: F02M 23/09 using valves directly opened by low pressure
• CPC Class Codes: Y02T 10/12 Improving ICE efficiencies
• CPC Class Codes: Y10S 261/19 Degassers

Abstract

A primary air supplying means for an intake system of an internal combustion engine having a valve member adapted to permit the flow of a primary air during the deceleration of the engine, said valve member forming an orifice in cooperation with a valve housing for housing said valve member, and a sensing tube opened at the upstream of the orifice of the valve member when said valve member is in the open condition and opened at the downstream of a valve seat when said valve member is in the closed condition, the pressure present in said sensing tube being equalized to the negative pressure during the normal drive of the engine and to the atmospheric pressure during the deceleration thereof.

Claims

1. An air supplying arrangement for an air intake system of an internal combustion engine;

said arrangement comprising; and

air source for supplying primary air, an inlet passage arranged downstream of an engine throttle valve for supplying air and fuel to combustion chambers of the engine, a primary air passage extending between said air souce and said inlet passage, primary air valve means arranged in said primary air passage adjacent said inlet passage and including means for opening said primary air passage to said inlet passage in response to engine deceleration conditions and including means for closing said primary air passage with respect to said inlet passage in response to operation of the engine under other than deceleration conditions, a sensing tube, means for directly communicating said sensing tube with the pressure in said primary air passage at a position upstream of said primary air valve means when said primary air valve means is open, means for directly communicating said sensing tube with the pressure in the inlet passage when said primary air valve means is closed, and control device means operatively connected to said sensing tube for controlling operating parameters of the engine in direct response to the pressure existing in the sensing tube.

2. An arrangement according to claim 1, wherein said means for directly communicating said sensing tube with the pressure in the inlet passage includes an orifice arranged in one of a valve member of said primary air valve means and a wall of said primary air passage adjacent said valve member, said orifice being dimensioned such that, when the primary air valve means is open, a pressure differential exists at opposite sides of the orifice with the side of the orifice communicating with the sensing tube being at the pressure in said primary air passage and with the side of the orifice communicating with the inlet passage being at the pressure in said inlet passage, whereby said sensing tube experiences the pressure in said primary air passage substantially unaffected by the pressure in said inlet passage when said primary air valve means is open.

3. An arrangement according to claim 2, wherein said means for opening said primary air passage includes the dimensioning of said valve member such that increased negative pressure in said inlet passage during Deceleration conditions effects the movement of said valve member to the open position.

4. An arrangement according to claim 3, wherein said means for closing said primary air passage includes resilient means continually pushing said valve member toward the closed position.

5. An arrangement according to claim 2, wherein said valve member is surrounded by a chamber leading from and arranged above the intake passage, said orifice being positioned between an outer edge of the valve member and wall portions of said chamber, said sensing tube being open to said chamber at a position above said orifice.

6. An arrangement accord ng to claim 2, wherein a valve seat for said valve member includes an inclined surface which forms a wall of said chamber, said sensing tube being opened at said inclined surface.

7. An arrangement according to claim 2, wherein said orifice extends through a part of said valve member.

8. An arrangement according to claim 2, wherein a valve seat for said valve member is provided with an aperture communicating with the sensing tube, which aperture is open to said primary air passage when said primary air valve means is open and is closed to said primary air passage when said primary air valve means is closed.

9. An arrangement according to claim 4, wherein said control device means includes primary air valve assisting means for assisting in closing and opening said primary air valve means.

10. An arrangement according to claim 9, wherein said primary air valve assisting means comprises a diaphragm device including a diaphragm and a diaphragm chamber, said diaphragm being rigidly connected with said valve member and said diaphragm chamber being communicated with said sensing tube whereby said valve member can maintain the primary air passage in the closed condition by the resilient means and the negative pressure introduced from said inlet passage through said sensing tube to said diaphragm chamber during the normal drive of the engine and can maintain the primary air passage in the open condition by the negative pressure acting on the valve member and the primary air pressure introduced from said primary air passage through said sensing tube to said diaphragm chamber during the deceleration of the engine.

11. An arrangement according to claim 10, wherein said control device means includes additional means for controlling operating parameters of the engine other than the flow of primary air.