| 摘要 |
A method for determination of regulating parameters of a regulator (13) which forms part of a system for controlling the injection of reducing agent upstream of a catalyst in an exhaust line from a combustion engine and which, on the basis of a signal which is delivered by a comparator (12) and depends on the match between an actual value and a set-point value of a variable related to function of the catalyst and affected by the reducing agent injection, generates a control signal which acts upon the injection of reducing agent. The influence of the reducing agent injection on said variable is approximated as a first-order process with an amplification factor and a time constant. Instantaneous values of this amplification factor and time constant are determined on the basis of information from a computation model which continuously determines current states in the catalyst. Instantaneous values of regulating parameters of the regulator are determined on the basis of the thus determined values of said amplification factor and time constant. The invention relates also to a system of said type in which regulating parameters of the system's regulator are determined in this way. |
