User Manual

Chapter 13
BOSCH HDI EDC 15C2 INJECTION SYSTEM AND PARTICLE FILTER
112
III - PARTICLE FILTER LOAD LEVEL MONITORING FUNCTION
A - ROLE
- To determine the condition of the particle filter (clogging level)
- To request activation of the regeneration assistance function, when necessary
- To ensure the effectiveness of the regeneration assistance function.
Main information used for monitoring the particle filter:
• pressure differential,
• exhaust gas temperature (downstream of the catalytic converter),
• exhaust gas temperature (upstream of the catalytic converter),
• number of miles travelled,
• inlet air flow.
Note: This information depends on the load level of the particle filter.
B - WORKING OUT THE PARTICLE FILTER LOAD LEVEL
The amount of particles present in the filter varies its load loss (inlet / outlet
pressure differential).
This permanently measured value represents the load level of the particle filter.
The cartographic maps of the injection ECU have 6 operating levels determined
by curves, from the volume flow of exhaust gases.
The volume flow of exhaust gases is essentially calculated from the following
parameters:
• pressure differential,
• inlet air flow,
• atmospheric pressure,
• exhaust gas temperature (downstream of the catalytic converter).
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