Internal-combustion engines – Charge forming device – Including exhaust gas condition responsive means
Patent
1991-08-07
1992-09-01
Nelli, Raymond A.
Internal-combustion engines
Charge forming device
Including exhaust gas condition responsive means
123520, 123698, F02D 4114
Patent
active
051430401
ABSTRACT:
An evaporative fuel control apparatus of an internal combustion engine for controlling a purge correction amount and a fuel injection amount in response to a concentration of fuel vapor in intake mixture. The apparatus includes a detection part for detecting operating conditions of the engine and for supplying signals indicative of the operating conditions, a purge valve for controlling a flow of fuel vapor from a fuel tank to an intake passage, and a calculation part for calculating the fuel injection amount in response to the signals. The apparatus also includes a first 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 with the feedback correction factor, a second injection control part for correcting the fuel injection amount in response to the fuel vapor concentration which is determined from the varied feedback correction factor, and a purge correction part for correcting a purging amount of fuel vapor being fed by the purge valve to the intake passage in response to the fuel vapor concentration.
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Mizuno Hiroyuki
Norota Kazuhiko
Okawa Koji
Nelli Raymond A.
Toyota Jidosha & Kabushiki Kaisha
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