Apparatus for controlling air-fuel ratio of internal combustion

Details Apparatus for controlling air-fuel ratio of internal combustion Apparatus for controlling air-fuel ratio of internal combustion

1997-08-27

2000-07-18

Miller, Carl S.

Internal-combustion engines

Charge forming device

Having fuel vapor recovery and storage system

123198D, F02M 3302

Patent

active

060892102

ABSTRACT:
To control the air-fuel ratio of an internal combustion engine without variations and thus suppress deterioration of the exhaust gas, a canister for adsorbing evaporated fuel is connected to a fuel tank. A release passage connects the canister to an intake tube for an internal combustion engine. A purge duty cycle flow rate control valve is installed in this release passage. An ECU provides feedback control of the air-fuel ratio according to the oxygen concentration in exhaust gas, controls the idle speed via an ISC valve, and controls purge by the purge duty cycle vacuum switching valve. As the purge is carried out, evaporated gas is released from the canister and purged. The ECU makes a decision, in a non-purging mode, as to whether the amount of the purged gas reaches a purge limit that is a critical value tolerated at each instant of time. If the result is that the purge limit will be reached, the execution of the purge is inhibited. At this time, the purge limit is established according to a range of purged flow rates that might hinder the operation of the internal combustion engine.

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