Measuring and testing – With fluid pressure – Motor part or auxiliary
Patent
1996-12-03
1998-04-14
Dombroske, George M.
Measuring and testing
With fluid pressure
Motor part or auxiliary
73 405R, 731181, 123519, 340451, G01M 1500, F02M 2508, F02B 7708
Patent
active
057394210
ABSTRACT:
A leak diagnosis system for an evaporative emission control system executes a correction process of diagnosis decision value. When the purge control of the evaporative emission control system is not executed, a purging line of the system is set in the atmospheric condition for a predetermined time. A pressure sensor installed in the purging line detects a pressure value V.sub.A0 in the atmospheric condition. A control unit of the leak diagnosis system determines a leak decision value V.sub.P0 on the basis of the atmospheric pressure detection value and an equation V.sub.P0 =V.sub.A0 +.DELTA.V.sub.0 where .DELTA.V.sub.0 is a difference between the output value in the predetermined positive pressure P.sub.0 and the output value V.sub.A0 in the atmospheric pressure condition and is constant. Therefore, it becomes possible to accurately execute the leak diagnosis.
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patent: 5560346 (1996-10-01), Isobe et al.
Goto Ken-ichi
Iochi Atsushi
Dombroske George M.
Nissan Motor Co.Ltd.
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