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System Features & Function
The ThermaCat™ filter system is a combined technology comprised of a regeneration component by means of external fuel injection and a passive component by means of a catalytically coated filter substrate.
The system is intended to operate on vehicles with severe duty cycles, where low exhaust gas temperatures are predominant and traditional passive DPF system would not be suitable.
The ThermaCat™ filter regeneration is electronically controlled and occurs automatically during normal vehicle operation, transparent to the operator.
As long as the vehicle is operated at a sufficient load, i.e. with exhaust gas temperatures above 500ºF, the particulate filter will regenerate itself by means of the catalytic filter.
In conditions where the vehicle runs for longer periods of time without higher loads and the exhaust gas temperatures are below 500ºF, then the filter will accumulate soot particles and the system backpressure will increase.
Once the exhaust gas backpressure reaches a preset value the system automatically activates the diesel post-injection. The injected fuel into the exhaust stream is converted into heat which increases the diesel filter inlet temperature sufficiently to cause a burn off (regeneration) of diesel Particulate Matter.