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Leak-check apparatus of fuel-vapor-processing system, fuel-temperature estimation apparatus and fuel-temperature-sensor diagnosis apparatus

  • US 20030019286A1
  • Filed: 07/25/2002
  • Published: 01/30/2003
  • Est. Priority Date: 07/25/2001
  • Status: Active Grant
First Claim
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1. A leak-check apparatus for an engine'"'"'s fuel-vapor-processing system wherein:

  • a canister is provided on a connecting pipe linking a fuel tank to an intake pipe of the engine;

    fuel evaporation gas resulting from evaporation of fuel in the fuel tank is absorbed into the canister;

    the amount of the fuel evaporation gas purged from the canister to the intake pipe is controlled by opening and closing a purge valve provided on the downstream side of the canister according to a running state of the engine; and

    a fresh air passage of the canister is opened and closed by a canister valve, the leak-check apparatus comprising;

    an engine-running-state leak-check means for checking a leak in the fuel-vapor-processing system in a running state of the engine; and

    an engine-stopped-state leak-check means for checking a leak in the fuel-vapor-processing system in a stopped state of the engine, wherein the engine-stopped-state leak-check means checks a leak in the fuel-vapor-processing system when the engine-running-state leak-check means determines existence of a leak in the fuel-vapor-processing system.

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