| 摘要 |
An apparatus and method for non-intrusive testing of the rate and total amount of vapor flow through the canister purge line in a motor vehicle. The apparatus includes a clamping structure, adapted for temporary attachment to the purge line leading from the evaporative canister to the engine's intake manifold. A vapor flow sensing system is provided within the structure. Both thermal loss and acoustical phase shift detection based sensing systems are disclosed herein. An operator secures the clamp over any portion of the purge line, and the vehicle's engine is put through a driving test cycle. The output of the sensing system is displayed, recorded, and integrated, for a subsequent pass/fail determination using predetermined vapor flow values.
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