Method and system for diesel particle filter regeneration

A method according to any one of the foregoing claims, whereby said first value is a suitable temperature below 500° C.

A method according to any one of the foregoing claims, whereby in said first mode the engine (101) is controlled in such a way that a substantially maximised exhaust temperature is achieved.

A method according to any one of the foregoing claims, whereby in said first mode the efficiency of the engine (101) is lowered to a low level so that a larger proportion of the energy changes to heat.

A method according to any one of the foregoing claims, whereby, at least in said first mode, the load upon the combustion engine (101) is increased by increasing

• a pumping work Mgas, and/or
• a braking torque Magg generated by ancillaries with which the vehicle is fitted.

A method according to any one of the foregoing claims, whereby in said second mode at least 50% higher content of nitrogen oxides is generated than in said first mode.

A method according to any one of the foregoing claims, whereby said first and second temperatures are determined by means of one or more temperature sensors (210-212) situated in or near to said particle filter (202).

A method according to any one of the foregoing claims, whereby said first and second temperatures are determined by means of a temperature sensor (210-212) situated in the exhaust flow, in conjunction with a model of said exhaust treatment.

A method according to any one of the foregoing claims, whereby in said first mode fuel is injected at least partly after a piston in said engine has passed top dead centre.

A method according to any one of the foregoing claims, whereby in said first mode fuel is injected at a later time and/or injection angle during said combustion than in the case of injection of fuel according to said second mode.

A method according to any one of the foregoing claims, whereby said regeneration method is a method for NO2 based regeneration of said particle filter (202).

A system for regeneration of a particle filter (202) pertaining to a combustion process, which filter is intended to treat exhaust gases arising from combustion in a combustion engine (101), which system is adapted to controlling said engine (101) according to at least a first mode and a second mode, in which first mode the engine (101) is controlled in such a way that a high exhaust temperature is generated, which system further comprises:

• means of determining a temperature for said particle filter (202) and
• means for controlling said engine (101) according to said first mode when said temperature determined is below a first value.