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Automotive evaporative emission leak detection system and module

  • US 6,053,151 A
  • Filed: 03/06/1998
  • Issued: 04/25/2000
  • Est. Priority Date: 09/08/1997
  • Status: Expired due to Term
First Claim
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1. An automotive vehicle comprising:

  • a fuel-consuming internal combustion engine that powers the vehicle and comprises an intake manifold;

    a fuel storage system for storing volatile liquid fuel for consumption by the engine and comprising an evaporative emission space for containing fuel vapor;

    an evaporative emission control system comprising a vent valve for selectively opening and closing a vent path from the evaporative emission space to atmosphere, a fuel vapor collection medium disposed in the vent path for trapping fuel vapors so their escape to atmosphere through the vent path is prevented, and a purge valve for selectively opening and closing a vapor purge path from the evaporative emission space to the intake manifold to selectively purge fuel vapors from the evaporative emission space and medium to the engine; and

    a vacuum regulator valve for regulating vacuum in the evaporative emission space to a defined magnitude when the vent valve is closed, the purge valve is open, and the engine is running.

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