Patent ID: 9097165
Filing Date: 2015-08-04
Classification: F01N,F02B,Y02A,Y02T

Abstract:
1. A vehicle having a system of diagnosing a secondary air injection apparatus, comprising: an engine generating power by burning an air/fuel mixture; an intake line supplying air to the engine; an exhaust line exhausting exhaust gas produced at the engine to an exterior of the vehicle; a secondary air injection (SAI) line branching off at a branch point of the intake line and being joined to the exhaust line at a joining point of the exhaust line; a first pressure sensor mounted at the intake line and detecting pressure or amount of intake air flowing through the intake line; a catalytic converter mounted at the exhaust line and removing noxious material contained in the exhaust gas; a first oxygen sensor mounted at the exhaust line between the joining point and the catalytic converter and detecting an air/fuel ratio in the exhaust line; an SAI pump mounted at the SAI line and pumping the air flowing through the intake line to the SAI line; an SAI valve mounted at the SAI line and selectively communicating the SAI line with the exhaust line; and a control portion controlling the SAI pump and the SAI valve so as to perform catalyst heating, wherein the control portion determines an air/fuel ratio of secondary combustion in a state where secondary air injection (SAI) is executed by driving the SAI pump and opening the SAI valve, determines an air/fuel ratio of a combustion chamber in a state where the SAI valve is closed after the catalyst heating is completed by driving the SAI pump and opening the SAI valve, and determines fault by comparing the air/fuel ratio of the secondary combustion or the air/fuel ratio of the combustion chamber with the air/fuel ratio of the exhaust line detected by the first oxygen sensor.