Internal-combustion engines – Charge forming device – Having fuel vapor recovery and storage system
Patent
1992-07-29
1993-03-23
Miller, Carl S.
Internal-combustion engines
Charge forming device
Having fuel vapor recovery and storage system
123518, F02M 3302
Patent
active
051954958
ABSTRACT:
An evaporative fuel-purging control system for an internal combustion engine having a canister in which evaporative fuel from a fuel tank is adsorbed. One or more purging control valves are arranged across a purging pipe extending between the canister and an intake system. An ECU integrates an estimated value of a flow rate of evaporative fuel supplied to the engine, which is estimated as a purging flow rate in the purging pipe, in accordance with engine operating conditions when a specific one of the purging control valves is opened to thereby obtain an integrated purging flow rate value, and subtracts a predetermined decremental value from the integrated purging flow rate value when the specific one purging control valve is closed. When the integrated purging flow rate value is equal to or smaller than a predetermined lower limit value, the ECU decreases the flow rate of the evaporative fuel supplied to the intake system, based on the integrated purging flow rate value obtained above. When an air-fuel ratio correction coefficient value is equal to or greater than a predetermined value and at the same time the integrated purging flow rate value is equal to or greater than a predetermined value, the ECU increases the flow rate, based upon the integrated purging flow rate value.
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patent: 5020503 (1991-06-01), Kanasashi
Fujimoto Sachito
Hosoda Fumio
Kitamoto Masakazu
Moriwaki Hideo
Honda Giken Kogyo Kabushiki Kaisha
Miller Carl S.
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