Patent ID: 9689325
Date: 2017-06-27
CPC Classifications: F02D

Claim:
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: 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.