System for assisting the regeneration of a particle filter comprised in the exhaust pipe of a diesel vehicle engine

Calculator (18) collects engine data such as differential temperature and actual temperatures (20,21,22,23) at the catalyser and particle filter and exhaust gas oxygen content (24). The data are used to control the timing and amount of multiple fuel injections for the regeneration of the catalyser/particle filter which are initiated during favorable engine modes as determined by the calculator from vehicle speed and accelerator pedal position.