Method of and apparatus for detecting fuel system leak
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United States of America Patent
Stats
-
Nov 21, 1995
Grant Date -
N/A
app pub date -
Feb 14, 1994
filing date -
Feb 13, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The existence of an unacceptable vapor leak can be determined by monitoring the pressure within a fuel system of an internal combustion engine. Once the engine is switched off, a period is timed to allow pressure variations due to movement of the fuel to subside to an acceptable level. The fuel system is closed and a first rate of pressure increase is determined by measuring a first time taken for the pressure to rise by a predetermined amount. A leak of a predetermined size is then introduced and a second rate of pressure increase is determined by measuring a second time taken for the pressure to rise by a predetermined amount. The first and second times are then compared to detect whether or not an unacceptable leak exists.
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