Leak detector for fuel vapor purge system

Details Leak detector for fuel vapor purge system Leak detector for fuel vapor purge system

2007-10-23

2007-10-23

Miller, Carl S. (Department: 3747)

Internal-combustion engines

Accessories

Covers, trays, vibrators, corrosion inhibitors, air filters

C123S520000, C073S118040

Reexamination Certificate

active

11264152

ABSTRACT:
A suction pump introduces negative pressure into a reference-pressure-detecting portion. A driving voltage V of the suction pump is adjusted in such a manner that pressure Pr in the reference-pressure-detecting portion is within a target pressure range. When the pressure Pr is brought into the target pressure range, the driving voltage V of the suction pump is stored as a first driving voltage V1and the pressure Pr is stored as a reference pressure Pr. When pressure detection and leak detection process are conducted, the suction pump is driven at the first driving voltage V1to introduce the negative pressure. The computer compares the pressure Pr with a leak determination value to determine whether a leak exists.

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