A motor vehicle exhaust line monitoring system

The invention is applicable to the technical field of environment friendliness and provides a tail gas monitoring system for a motor vehicle. The tail gas monitoring system for the motor vehicle comprises an ultraviolet monitoring channel, an infrared monitoring channel and a main control unit, wherein the ultraviolet monitoring channel is used for emitting ultraviolet to a monitoring region and acquiring an ultraviolet signal absorbed by tail gas emitted by the motor vehicle when the motor vehicle runs into the monitoring region; the infrared monitoring channel is used for emitting infrared to the monitoring region and acquiring an infrared signal absorbed by the tail gas emitted by the motor vehicle when the motor vehicle runs into the monitoring region; and the main control unit is connected with the ultraviolet monitoring channel and the infrared monitoring channel simultaneously and used for calculating component content of the tail gas of the motor vehicle according to the optical signals acquired by the ultraviolet monitoring channel and the infrared monitoring channel. In the tail gas monitoring system, the content of corresponding gas components of the tail gas of the motor vehicle can be monitored through the two channels, namely the ultraviolet monitoring channel and the infrared monitoring channel, so that unmanned full-automatic online monitoring can be realized; furthermore, a real tail gas emission situation of the motor vehicle during running can be mastered, so that a user can immediately manage vehicles with severe pollution.