Patent ID: 7775034
Filing Date: 2010-08-17
Classification: F01N

Abstract:
1. A control device of an exhaust purification device for an engine, comprising: a plurality of addition valves that supply an additive to a plurality of separate exhaust purification catalysts; a supply passageway that is provided between a pump and the plurality of addition valves, and that supplies the additive to each of the plurality of addition valves from the pump, the supply passageway including branch portions that are connected to the plurality of addition valves, and a common portion to which the branch portions are joined and that is connected to the pump; at least one controller that controls operation of the plurality of addition valves based on a supply pressure in the common portion of the supply passageway, and that controls operation of the plurality of addition valves such that an addition period of a first addition valve of the plurality of addition valves is set to begin at a different time than an addition period of a second addition valve of the plurality of addition valves, wherein the plurality of addition valves are located downstream of a plurality of exhaust valves provided to respective cylinders of the engine.