Exhaust particulate filter

A control system for regenerating a particulate filter for an exhaust system configured to receive an exhaust flow, the control system comprising:

• a fuel injector disposed for injecting a source of hydrocarbon into the exhaust flow upstream of the filter;
• a temperature sensor for sensing a temperature change at the filter in response to oxidation of the hydrocarbon and a resulting temperature rise within the filter, the temperature rise being initiated at a downstream end of the filter by virtue of the direction of exhaust flow;
• a controller responsive to the temperature sensor for adjusting the amount of hydrocarbon being injected into the filter to increase the temperature within the filter above a defined threshold from the downstream end to an upstream end of the filter, the defined threshold temperature being sufficient to oxidize soot, the elevated temperature above the defined threshold temperature thereby serving to regenerate the filter;
• the controller being responsive to the temperature sensor for adjusting the amount of injected hydrocarbon from the fuel injector to cause a temperature rise at the upstream end of the filter to be substantially equal to or greater than a temperature rise at the downstream end of the filter as the internal filter temperature rises above the threshold temperature;
• and
• a sensor for sensing an operational parameter indicative of the filter regeneration being complete;
• wherein the controller is responsive to the sensed operational parameter to prevent further injection of the hydrocarbon into the exhaust flow in response to the filter regeneration being complete.