Internal-combustion engines – Charge forming device – Having fuel vapor recovery and storage system
Patent
1992-04-07
1993-11-09
Wolfe, Willis R.
Internal-combustion engines
Charge forming device
Having fuel vapor recovery and storage system
G01F 128, F02M 3302
Patent
active
052593550
ABSTRACT:
A fuel evaporative emission flow rate detecting system is capable of detecting a small flow rate of the fuel evaporative emission. The system includes an electromagnetic valve (22) in a communication passage (21). The pressure of the fuel evaporative emission in the fuel tank is detected by means of a magnetic flux detector or so forth. A control circuit is responsive to the pressure of the fuel evaporative emission reaching 15 mmHg, for example, while the communication passage (21) is held closed, to open the communication passage (21). On the other hand, the control circuit closes the communication passage when the pressure of the fuel evaporative emission becomes lower than or equal to 8 mmHg. Depending on a period, in which the communication passage (21) is held open, the flow rate of the fuel evaporative emission is calculated.
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Iida Hisashi
Isomura Shigenori
Koseki Hideki
Nakashima Akihiro
Tsuji Takao
Moulis Thomas
Nippondenso Co. Ltd.
Ubukata Industries Co., Ltd.
Wolfe Willis R.
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