| 摘要 |
A system for verifying fuel cap engagement utilizes a transducer coupled to a purge line of a fuel vapor recovery system to generate an electrical signal corresponding to one of the vapor pressure and the vapor flow rate in the purge line. A monitor receives the electrical signal and estimates the vapor pressure when the electrical signal corresponds to the vapor flow rate. The monitor likewise estimates the vapor flow rate when the electrical signal corresponds to the vapor pressure. The monitor also correlates the electrical signal and the estimate to generate a dataset relating vapor pressures to corresponding vapor flow rates at predetermined time intervals, computes a linear approximation of pressure versus flow rate, and computes a curve approximation of pressure versus flow rate. An indicator is actuated by the monitor when the difference between the computed linear and curve approximations is less than a predetermined threshold value.
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