Patent ID: 8151555

Claim:
A power source system of an internal combustion engine, comprising: an exhaust gas purifying device purifying an exhaust gas of said internal combustion engine; a performance recovering unit executing a performance recovery process of recovering exhaust gas purifying performance of said exhaust gas purifying device by removing matters accumulated in said exhaust gas purifying device as said exhaust gas purifying device purifies the exhaust gas in a way that heats said exhaust gas purifying device; and an electric heater generating the heat by energization, and heating said exhaust gas purifying device, wherein if said internal combustion engine stops during execution of the performance recovery process by said performance recovering unit, the performance recovery process stops before the internal combustion engine starts up a next time, and said electric heater is inhibited from being energized during a predetermined period after starting up said internal combustion engine next time, wherein the predetermined period during which the electric heater is inhibited from being energized is a time required for substantial completion of a reaction of a residual reducing agent in the exhaust gas purifying device.