Evaporative fuel discharge-preventing device for engine

• US 5,546,913 A
• Filed: 05/16/1995
• Issued: 08/20/1996
• Est. Priority Date: 08/10/1994
• Status: Expired due to Fees

• Current Assignee: Suzuki Motor Corporation
• Original Assignee: Suzuki Motor Corporation
• Inventors: Aoki, Masahiro
• Primary Examiner(s): MILLER, CARL STUART
• Application Number:
  US08/442,476
• Time in Patent Office: 462 Days
• Field of Search: 123/520, 123/521, 123/516, 123/518, 123/519, 123/198 D
• US Class Current: 123/520
• CPC Class Codes: F02M 25/0854 Details of the absorption canister

Abstract

An evaporative fuel discharge-preventing device for an engine which comprises a surge tank for leveling out fluctuations in the amount of evaporated fuel so as to provide a stabilized engine rotational speed, and to prevent the impairment of drivability. The surge tank has outlet and inlet side pipes arranged at a height position to avoid storing the evaporated fuel in a liquid state within the surge tank. The surge tank, having a predetermined volumetric capacity, is disposed midway of an air communication passage between an intake manifold and a purge valve, and is located at a height position greater than the intake manifold.

Claims

1. In an evaporative fuel discharge-preventing device for an engine, having a canister provided midway along an air communication passage which intercommunicates the inside of a fuel tank and an air intake passage of an engine intake manifold, and a purge valve provided in said air communication passage between said canister and said intake manifold, in which said canister absorbingly retains evaporated fuel during stopping of said engine, said evaporated fuel being generated in said fuel tank, but releases said absorbingly retained fuel from said canister during operation of said engine by fresh air being introduced into said canister, whereby said evaporated fuel is supplied to said air intake passage, the improvement comprising:

a surge tank, having a predetermined volumetric capacity, disposed in said air communication passage between said intake manifold and said purge valve, said surge tank being located at a position greater in height than said intake manifold and said surge tank having an outlet side pipe positioned at a lower portion thereof and an inlet side pipe located at a position above said outlet side pipe.