Method and system for determining temperature setpoints in systems, including particulate filters with regeneration capabilities

摘要

A method of determining a setpoint Tset for the temperature at a particulate filter (44), wherein the setpoint Tset is used to control the regeneration of particulate trapped by the particulate filter, the method comprising: Determining a critical temperature value Tc for the filter, the value Tc corresponding to a maximum temperature that the filter can be exposed to during regeneration without risking overheating, Determining a temperature setting value Ta for the filter, the value Ta representing the thermal inertia of the filter during regeneration, and Determining the target value Tset in dependence on the values Tc and Ta and determining the value Tc as a function of the soot accumulation of the filter, the space velocity of the exhaust gases through a particulate canister (42), the oxygen concentration of the exhaust gases, the heat capacity of the exhaust gases, the mass flow rate of the exhaust gases through the particulate canister, and the thermal resistance of the filter.