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(11) | EP 1 722 088 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | Exhaust gas treatment system for internal combustion engine |
| (57) In an exhaust gas treatment system for an internal combustion engine, a basic (post-injection)
fuel injection quantity is calculated at block 62a based on an operating condition
of the engine, a corrected fuel injection quantity is calculated at blocks 62b1, 62b2
to correct the basic supply quantity based on an exhaust gas temperature TEX1 at a
location upstream of the oxidation catalytic converter, and a final (post-injection)
fuel injection quantity is calculated in blocks 62c to 62f based on the calculated
quantities and injected into the engine 10. Thus the detected exhaust gas temperature
TEX1 is not affected by the combustion in the DPF or the mass thereof, nor is it affected
by the combustion in the converter or the mass thereof, so that the fuel supply for
regeneration can be achieved with good accuracy, thereby improving the DPF regeneration
efficiency.
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