Internal-combustion engines – Charge forming device – Having fuel vapor recovery and storage system
Patent
1992-07-22
1994-02-08
Miller, Carl S.
Internal-combustion engines
Charge forming device
Having fuel vapor recovery and storage system
123198D, F02M 3704
Patent
active
052841219
ABSTRACT:
An internal combustion engine has an evaporated fuel purge system for directly feeding evaporated fuel of a fuel tank into an intake pipe of the engine during the engine is running. This system comprises a purge control valve for opening or closing a flow line which connects an upper space of the fuel tank with the intake pipe, a controller for controlling the operation of the valve, a throttle section formed in series with the purge control valve, and pressure and temperature sensors which are located on the upstream side of the throttle section for detecting a pressure and a temperature of the evaporated fuel. When a value detected by the pressure sensor exceeds a predetermined value of pressure for providing a critical pressure ratio at which a flow rate of the evaporated fuel at the throttle section substantially equals to a sonic velocity, the controller opens the purge control valve to cause a purged flow of the evaporated fuel whose flow rate is constant. Simultaneously, the controller calculates a purged flow rate of the evaporated fuel from the detected values of the pressure and temperature sensors and a time period during which the purge control valve is opened. On the basis of the calculated purged flow rate, a reduction correction is made to an amount of the fuel to be supplied to the engine in order to maintain an air-fuel ratio in the optimum condition. The calculated purged flow rate may be indicated.
REFERENCES:
patent: 4748959 (1988-06-01), Cook
patent: 4949695 (1990-08-01), Uranashi
patent: 5048492 (1991-09-01), Davenport
patent: 5054454 (1991-10-01), Hamburg
patent: 5067469 (1991-11-01), Hamburg
patent: 5080078 (1992-01-01), Hamburg
Iida et al Appln. No. 07/863091, Filed Apr. 3, 1992.
Nakashima et al Appln. No. 07/864728, Filed Apr. 7, 1992.
Abe Seiko
Igashira Toshihiko
Sakakibara Yasuyuki
Miller Carl S.
Nippon Soken Inc.
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