METHOD AND DEVICE FOR SERVICEABILITY CHECK OF CATALYST CONVERTER Russian patent published in 1998 - IPC

FIELD: cleaning exhaust gases of internal- combustion engines. SUBSTANCE: method for serviceability check of catalyst converter connected to vehicle internal-combustion engine and incorporating carrying structure and catalytically active medium bonded with the latter involves following operations: measuring temperature (T_c) of catalytically active layer and/or of catalyst converter structure at least at one point; measuring exhaust gas temperature (T_g) in counter- current flow upstream of this point of catalyst converter; shaping at least one time derivative of both temperatures; shaping difference of time derivatives; recording moment (t_i) after engine starting at which difference reverses its polarity. Method implementing this method has at least one sensing element for measuring carrier structure and/or catalytically active layer (T_c), at least one sensing element for measuring exhaust gas temperature (T_g), differentiating circuit for shaping time derivatives of measured temperatures (T_c,T_g), differential circuit for shaping difference form both time derivatives, first and second comparison circuits, first and second storage devices for saving desired values and/or temperatures measured earlier. EFFECT: timely detection of troubles in catalyst converter including its cold-starting operating period. 13 cl, 1 dwg