Patent ID: 8627650

Claim:
An exhaust gas purification device, comprising: a bypass passage disposed in an exhaust passage of an internal combustion engine; an adsorbent which is disposed in the bypass passage, and adsorbs unburned components in exhaust gas at a low temperature and desorbs the adsorbed unburned components at a high temperature; an exhaust gas purification catalyst which is disposed in the exhaust passage at a downstream side of a portion where the bypass passage merges, and purifies the unburned components in exhaust gas; an electronic control unit, including program logic, configured to output control signals; and a switching valve configured to adjust a desorption amount of the unburned components adsorbed by the adsorbent based on an adjusting-desorption-amount control signal output from the electronic control unit; wherein the adjusting-desorption-amount control signal output from the electronic control unit is based on an integrated fuel cut air amount, which is an integrated value of an air amount taken into a combustion chamber of the internal combustion engine during execution of fuel cut; and wherein the electronic control unit, including the program logic, is configured to: output an increasing-desorption-amount control signal to the switching valve to increase the desorption amount as the integrated fuel cut air amount increases; output a not-increasing-desorption-amount control signal to the switching valve to not increase the desorption amount when a determination is made that the unburned components desorbed from the adsorbent have not been purified in the exhaust gas purification catalyst; and output a decreasing-desorption-amount control signal to the switching valve to decrease the desorption amount when a determination is made that a state is established where the internal combustion engine discharges a large amount of exhaust gas to the exhaust passage.