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EVAPORATIVE FUEL PROCESSING SYSTEM

  • US 20150285170A1
  • Filed: 03/30/2015
  • Published: 10/08/2015
  • Est. Priority Date: 04/07/2014
  • Status: Active Grant
First Claim
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1. An evaporative fuel processing system that guides evaporative fuel generated in an inside of a fuel tank, which stores fuel of an internal combustion engine, to an air intake system of the internal combustion engine, the evaporative fuel processing system comprising:

  • a canister that is communicated with the inside of the fuel tank and recovers the evaporative fuel of the fuel tank;

    a purge conduit that forms a purge passage, which communicates between an inside of the canister and an air intake passage of the air intake system;

    a purge valve that is installed in the purge conduit to communicate or discommunicate between the inside of the canister and the air intake passage;

    a purge valve control device that controls the purge valve to open or close the purge valve;

    a purge pump that is installed in one of;

    an atmosphere communication conduit, which forms an atmosphere communication passage that communicates between the inside of the canister and atmosphere; and

    the purge conduit, wherein the purge pump pumps the evaporative fuel, which is recovered by the canister, to the air intake system;

    a pump electric power supply device that supplies an electric power to the purge pump; and

    a pressure sensing device that senses a pressure of the air intake passage and outputs a signal, which corresponds to the pressure of the air intake passage, wherein;

    the pump electric power supply device supplies the electric power to the purge pump to form a flow of gas from the inside of the canister to the air intake passage during a running period of the internal combustion engine; and

    the pump electric power supply device changes an amount of the electric power supplied to the purge pump based on the signal outputted from the pressure sensing device at a time of opening the purge valve during the running period of the internal combustion engine.

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