Patent ID: 7481045

Claim:
A device for the post-injection of a regeneration liquid, particularly for the regeneration of a device for filtering exhaust gases produced by a diesel engine, and comprising at least one exhaust pipe, at least one oxidation catalyst and a filtration device for retaining particulates after they have been sent to the oxidation catalyst, said device for the post-injection of a regeneration liquid further comprising: a regeneration liquid supply device, a device for supplying pressurized gaseous fluid, a post-injection device including: at least one injector, at least one injector-holder, on which said injector is arranged, at least one capillary starting from the injector and terminating in at least one exhaust pipe via at least one opening, upstream of the catalyst, at least one tube connected to the device for supplying pressurized gaseous fluid, and terminating in the exhaust pipe(s), via at least one opening, the capillary and the tube are concentric and coaxial, like their respective openings which terminate in the exhaust pipe(s), the capillary is contained in the tube, said post-injection device comprising means for injecting, upstream of the catalyst: on the one hand, the regeneration liquid, and on the other, the pressurized gaseous fluid, this regeneration liquid and this pressurized gaseous fluid together forming an aerosol suitable for spraying the regeneration liquid into the exhaust gases and for increasing their temperature, so as to accelerate the oxidation rate of said particulates and thereby contribute to the regeneration of the filtration device, optionally at least one temperature sensor for measuring θ m , arranged on the exhaust pipe(s), upstream of the catalyst, optionally at least one pressure sensor for measuring P m in the exhaust pipe(s) and arranged on said pipe(s) upstream of the catalyst, at least one computer for controlling the post-injection, to which are subjected the regeneration liquid supply device, the device for supplying pressurized gaseous fluid, the post-injection device, and the temperature or pressure sensor(s), if any.