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| Exhaust Gas Treatment |
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The exhaust gas treatment system includes a diesel particulate filter (DPF) to trap particulate matter (PM) in exhaust gas, and it controls exhaust gas temperature and fuel injections to burn the PM trapped by the DPF (DPF regeneration control), reducing emissions.
DENSO’s unique DPF and algorithm for the DPF regeneration control effectively reduce emissions without lowering engine performance.
How it works:
- PM in exhaust gas is trapped by the DPF as the exhaust gas passes through DPF walls.
- DPF pressure sensor detects a pressure loss in exhaust gas passing through the DPF, detecting an amount of trapped PM.
- When the trapped PM amount exceeds a certain degree, the engine ECU controls injection timings, and opening degrees of the EGR valve and/or the electronic throttle to raise exhaust gas temperature, which induces catalytic reactions to burn the PM in the DPF.
- The engine ECU also controls the multiple injections, especially the post injection, of the common rail system to produce hydrocarbons that are burned by catalyst to further increase the temperature of the DPF, facilitating burning of PM.
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Copyright ® 2005 DENSO CORPORATION. All rights reserved. |
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