Internal-combustion engines – Charge forming device – Including exhaust gas condition responsive means
Patent
1991-08-07
1992-09-29
Neill, Raymond A.
Internal-combustion engines
Charge forming device
Including exhaust gas condition responsive means
123520, F02M 5100
Patent
active
051506866
ABSTRACT:
An evaporative fuel control apparatus of an internal combustion engine is provided with a purge correction prohibition part. The apparatus includes a detection part for detecting operating conditions of the internal combustion engine and for supplying signals indicative of the operating conditions, a purge control valve for controlling a flow of fuel vapor to an intake passage of the engine, a calculation part for calculating a fuel injection amount in response to the signals, and a fuel injection control part for varying a feedback correction factor of an air-fuel ratio in response to the signals so as to maintain the air-fuel ratio at a stoichiometric value and for correcting the fuel injection amount on the basis of the feedback correction factor. The apparatus also includes a purge correction part for correcting a purging amount of fuel vapor which is fed into the intake passage, in response to the feedback correction factor, so that the feedback correction factor is adjusted to be within a predetermined range, and a prohibition part for preventing the purge correction part from adjusting the purging amount of fuel vapor when the feedback correction factor is not within the predetermined range and it is determined in response to the signals that the feedback correction factor changes from a value outside the range to a value within the range.
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Norota Kazuhiko
Okawa Koji
Neill Raymond A.
Toyota Jidosha & Kabushiki Kaisha
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