Patent ID: 6560959
Filing Date: 2003-05-13
Classification: B01D,F01N,F02D,Y02T

Abstract:
An early-warming control apparatus for warming a catalyst for purifying exhaust gas of an internal combustion engine at an early time, said early-warming control apparatus comprising:an exhaust-gas-heating control means for executing ignition retard control to raise the exhaust gas temperature making a rich component of the exhaust gas burnable inside a path on an upstream side of the catalyst through which the exhaust gas flows during execution of control to heat the catalyst at an early time; a cylinder deactivation operation control means for halting injection of fuel into at least one cylinder of said internal combustion engine and operating the internal combustion engine by using remaining cylinders during execution of the control to heat the catalyst at an early time; and a variable valve timing means for changing a valve timing of each exhaust valve provided in the internal combustion engine, wherein said cylinder deactivation operation control means changes the valve timing of the exhaust valve provided for each of the halted-injection cylinders during a cylinder deactivation operation in accordance with the valve timing of the exhaust valve provided for each of working cylinders so that high-temperature gas exhausted from said remaining cylinders is merged and mixed with unburned air exhausted from said at least one, halted-injection cylinder at a merge portion in an exhaust manifold of the cylinders to enable after-burning of a burnable component of the exhaust gas in the path upstream of said catalyst.