Independant Emissions Testing Lab (IETL)* result verification on the effect of a Webasto pre-heater on the emissions performance of a diesel engine. PM Emissions & DPF Performance
Results Summary
1. Engine start-up temperature has a huge impact on the emissions levels emitted by the engine
2. The test results show a 29% reduction in CO during winter conditions, and a 62% reduction during normal ambient conditions.
3. Pre-heating the engine does not have a significant effect on the Hydrocarbon emissions.
4. NO x emissions were reduced by around 40% by pre-heting the engine to 155 ° F.
5. PM emissions have a significant effect and were reduced by 66% by pre-heating the engine during the cold weather conditions. Pre-heating also provided a 27% reduction in PM emissions during normal ambient conditions. This will help in longevity of the DPF life and can avoid more frequent regenerations and cleaning intervals.
How Engine-Off Heating technology works
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1. Engine running: The engine generates heat, which is circulated via the heater core.
2. With Engine-Off Heating technology – Quick stop: Residual heat in the engine is used by the heater, as the Webasto circulation pump keeps residual heat moving through the cooling system. The temperature in the cabin interior remains stable.
3. With Engine-Off Heating technology – Longer stop: If the engine continues to cool down, the webasto coolant heater also switches on automatically. The temperature of the engine and cabin remain stable.
4. Without Engine-Off Heating technology – Engine off: When the engine is switched off, heat is no longer distributed to the cabin interior through circulating coolant. The thermal energy stored in the engine is lost; the cabin interior and engine cool down.
Engine
Coolant heater
Pump on
Pump off
Cabin interior heat exchange system
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