US 12,228,474 B2
Leakage detector
Yuya Tanida, Obu (JP)
Assigned to AISAN KOGYO KABUSHIKI KAISHA, Obu (JP)
Filed by AISAN KOGYO KABUSHIKI KAISHA, Obu (JP)
Filed on Jul. 22, 2022, as Appl. No. 17/871,039.
Claims priority of application No. 2021-129132 (JP), filed on Aug. 5, 2021.
Prior Publication US 2023/0043915 A1, Feb. 9, 2023
Int. Cl. G01M 3/32 (2006.01); F02M 25/08 (2006.01)
CPC G01M 3/3236 (2013.01) [G01M 3/3209 (2013.01); F02M 25/0818 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A leakage detector for a fuel vapor processing system having a canister, the leakage detector comprising:
a sealing system connected to the canister and configured to selectively seal an inspection area that includes the canister; and
a control unit comprising a programmed processor, wherein:
the control unit is configured to calculate an amount of a fuel vapor in the canister,
the control unit is configured to select a leakage detection method from a group consisting of a positive pressure type method and a negative pressure type method based on the calculated amount of fuel vapor in the canister, and
the control unit is configured to perform the selected leakage detection method and to determine whether a leak is present based on a change in an internal pressure of the inspection area closed by the sealing system over a period of time.