Patent ID: 7827784
Filing Date: 2010-11-09
Classification: F01N,F02D,Y02T

Abstract:
1. An exhaust gas control apparatus for an internal combustion engine, comprising: an exhaust gas purification catalyst device provided in an exhaust passage of the internal combustion engine; an HC adsorption portion, provided in the exhaust passage, which adsorbs hydrocarbon in exhaust gas; passage switching means for switching a passage through which the exhaust gas flows between a passage in which the HC absorption portion is provided, and a passage that bypasses the HC absorption portion, using a negative pressure in an intake pipe of the internal combustion engine; and intake pipe negative pressure control means for controlling the negative pressure in the intake pipe to operate the passage switching means by executing at least one of a timing advance control that advances a valve timing of an intake valve, and a control that reduces an opening amount of a throttle valve, at a time of start of the internal combustion engine, wherein when the rotational speed of the internal combustion engine is below a predetermined value, the intake pipe negative pressure control means sets the advance amount, by which the valve timing of the intake valve is advanced, to substantially zero, or a value smaller than a value to which the advance amount is set when the rotational speed of the internal combustion engine is equal to or above the predetermined value, and wherein the exhaust gas control apparatus includes means for cutting off fuel supply during a period from when operation of the passage switching means starts, until when the passage switching means completes switching of the passage through which the exhaust gas flows.