US 5,349,934 A · Evaporative emission control system for internal combustion engines

Abstract

An evaporative fuel emission control system for an internal combustion engine has a canister connected to a fuel tank of the engine. The canister temporarily stores evaporative fuel generated from the fuel tank. The evaporative emission control system also includes a purging passage connecting the canister and a portion of an intake passage at a location downstream of a throttle valve arranged in the intake passage. An amount of evaporative fuel is increased which is generated from the fuel tank. In a preferred form, the system includes a second fuel tank arranged between the first-mentioned fuel tank and the canister. Evaporative fuel is increased by evaporating fuel in the second fuel tank.

Claims11

Dependent claims

An evaporative emission control system for an internal combustion engine having an intake passage, a a throttle valve arranged in said intake passage, and a fuel tank, comprising:

a canister connected to said fuel tank for temporarily storing evaporative fuel generated from tank;
a purging passage connecting between said canister and a portion of said intake passage at a location downstream of said throttle valve;
and
evaporative fuel-increasing means for increasing an amount of evaporative fuel generated from said fuel tank,
said evaporative fuel-increasing mean including a second fuel tank arranged between said first-mentioned fuel tank and said canister, and fuel-vaporizing means arranged in said second fuel tank.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application

08/078,010Filed 14 Jun 1993

Priority

JP 4-18583719 Jun 1992

Granted

27 Sep 1994

Term ends

Not estimatedThe source records don’t support an estimate.

Classification8 codes

F02M 25/08
Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture:…
F02D 41/0032
Adding fuel vapours, e.g. drawn from engine fuel reservoir: controlling the purging of the canister as a function of the engine operating conditions
F02M 31/18
Other apparatus for heating fuel: to vaporise fuel
Y02T 10/12
Internal combustion engine [ICE] based vehicles: improving ICE efficiencies

Evaporative emission control system for internal combustion engines

Life of this patent

Evaporative emission control system for internal combustion engines

Life of this patent

Abstract

Claims11