Patent ID: 8661672

Claim:
A method for manufacturing a motor vehicle exhaust gas purifying member, the purifying member comprising: a substantially cylindrical housing defining an exhaust gas channel, a substantially cylindrical exhaust gas purification block placed in the housing, and an exhaust gas purification block-retaining element, the exhaust gas purification block having a side wall ( 9 ) facing the housing and defining an annular space with said housing, said exhaust gas purification block retaining element being inserted in the annular space between the housing and the side wall of the exhaust gas purification block, and wherein said exhaust gas purification block retaining element is, during manufacture of said exhaust gas purifying member, made from a material including at least one nonfunctional component intended to disappear after a characteristic period of using said exhaust gas purifying member, and in that the method comprises the following steps: acquiring a first magnitude representative of a mass of the exhaust gas purification block retaining element; acquiring a second magnitude representative of a composition of the nonfunctional component of said exhaust gas purification block retaining element; determining, from the first and second acquired magnitudes, an equivalent mass corresponding to the mass of said exhaust gas purification block retaining element after said characteristic period of use of said exhaust gas purifying member; assessing a volume on the basis of the equivalent mass and a target installation density for said exhaust gas purification block retaining element in the annular space; determining a diameter of the housing on the basis of an outer diameter of the exhaust gas purification block and the volume; assembling the housing, said exhaust gas purification block retaining element and the exhaust gas purification block to obtain a housing whereof a diameter is equal to the predetermined diameter, the installation density of the exhaust gas purification block retaining element being equal to the target installation density after said characteristic period of use of said exhaust gas purifying member.