Patent ID: 8607552
Filing Date: 2013-12-17
Classification: F01N,F01P

Abstract:
1. An emission control system comprising: an absorbent provided in a passage through which an exhaust emission of an internal combustion engine flows, the exhaust emission containing a particular component, the absorbent acting to absorb the particular component with a temperature thereof being lower than a first temperature, the absorbent acting to desorb therefrom the absorbed particular component with the temperature thereof being equal to or higher than the first temperature; a catalyst provided in the passage, the catalyst acting to convert the particular component desorbed from the absorbent into another component with a temperature thereof being equal to or higher than a second temperature, the second temperature being higher than the first temperature; a heat recovery device disposed in the passage upstream of the absorbent and configured to recover heat from the exhaust emission by heat exchange between a heat-transfer medium and the exhaust emission; an adjusting unit configured to adjust an amount of heat to be recovered by the heat recovery device to thereby adjust a temperature state of the exhaust emission; a circulating unit configured to circulate the heat-transfer medium through the heat recovery device, wherein the adjusting unit is configured to adjust a quantity of flow of the heat-transfer medium to be circulated to the heat recovery device to thereby adjust the amount of heat to be recovered by the heat recovery device; a temperature state determining unit configured to determine whether a temperature of the exhaust emission upstream of the heat recovery device is in a high-temperature state with the temperature of the exhaust emission being equal to or higher than the second temperature or a low-temperature state with the temperature of the exhaust emission being lower than the second temperature, wherein the adjusting unit is configured to adjust the quantity of flow of the heat-transfer medium to be circulated to the heat recovery device to a first value when it is determined that the temperature of the exhaust emission upstream of the heat recovery device is in the high-temperature state and to a second value when it is determined that the temperature of the exhaust emission upstream of the heat recovery device is in the low-temperature state, the first value being lower than the second value.