Patent ID: 9316558
Filing Date: 2016-04-19
CPC Classification: F02D,F02M,G01L,Y02T

Claim Text:
1. A system comprising: a pressure sensor that generates a first pressure signal indicating a first pressure within a fuel system of an engine when the engine is started and when a purge valve of the fuel system is closed; and a controller configured to: detect when the engine is started, determine an amount of variation in the first pressure signal over a first period, determine a state of the pressure sensor based on the amount of variation in the first pressure signal over the first period, and determine that the pressure sensor operates normally if the amount of variation in the first pressure signal is less than a first threshold and that the pressure sensor is faulty if the amount of variation in the first pressure signal is greater than or equal to the first threshold, wherein the first threshold is determined based on a leakage rating of the purge valve, and wherein the leakage rating of the purge valve is non-zero.