Patent ID: 7086276
Filing Date: 2006-08-08
Classification: F02M

Abstract:
1. A method of diagnosing an evaporative emission control system to determine if a leak is present in the system, the method comprising: sealing the system from external influences; monitoring a pressure level with in the system over a cooling period, the monitoring including: computing the temperature-compensated pressure as a function of the pressure at a first point in time and the temperature measured at substantially the first point, and at a second point, in time, wherein the function comprises the expression: where P c is the temperature-compensated pressure, P 1 is the pressure measured at the first point in time, T 1 is the temperature measured at substantially the first point in time, and T 2 is the temperature measured at the second point in time; and indicating a potential leak condition through a comparison of the pressure level within the system and a given threshold.