Discussion
A diesel particulate filter regenerates every \( 500 \) km on a vehicle covering \( 25000 \) km a year. The number of regenerations a year is
Answer: C
Correct answer: 50
Divide the annual distance by the regeneration interval:
\[ \frac{25\,000}{500} = 50 \]
Each regeneration raises the exhaust temperature enough to burn off the soot, usually by injecting extra fuel, so fifty of them a year carry a real fuel penalty. The interval also depends on how the vehicle is used: heavy urban duty loads the filter faster and, worse, may never allow regeneration to complete.
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