Patent ID: 8371109
Filing Date: 2013-02-12
Classification: B60K,F01N,Y02A,Y02T

Abstract:
1. An exhaust emission control device having a particulate filter incorporated in an exhaust pipe for capturing particulates in exhaust gas and a selective reduction catalyst downstream of said particulate filter and capable of selectively reacting NO x with ammonia even in the presence of oxygen, urea water as reducing agent being addable between said selective reduction catalyst and said particulate filter, the exhaust emission control device comprising: the particulate filter arranged along a frame of a vehicle and in a forward-and-aft direction of the vehicle, and the particulate filter is arranged laterally inward of the vehicle relative to the frame, the selective reduction catalyst arranged in a vicinity of an inlet end of said particulate filter and directed laterally outward of the vehicle, and the selective reduction catalyst is arranged laterally outward of the vehicle relative to the frame, a communication passage arranged to guide the exhaust gas from an outlet end of the particulate filter to an inlet end of the selective reduction catalyst in a forward fold-back manner, the communication passage connecting the outlet end of the particulate filter with the inlet end of the selective reduction catalyst and including a urea water adding device provided at a midway of the communication passage to add urea water, the gas collection chamber including the urea water adding device, and the urea water adding device being arranged upstream of the mixing pipe.