User Manual

Chapter 13
BOSCH HDI EDC 15C2 INJECTION SYSTEM AND PARTICLE FILTER
121
C - INLET AIR HEATER
The inlet air heater is used:
• to facilitate the rise in temperature of the exhaust gases,
• to quickly place the engine operating point within conditions allowing effective
post-injection.
Note: The temperature of the air entering the engine must be between 40°C
and 70°C to allow efficient post-combustion.
D - POST-INJECTION
The catalytic converter, located upstream of the particle filter, is an oxidation
catalytic converter.
In the presence of unburned hydrocarbons (HC), the heat efficiency of the
catalytic converter increases.
The temperature of the exhaust gases increases.
During post-injection:
• the fuel is injected after Top Dead Centre (20 - 120° crankshaft),
• the temperature of the exhaust pipe increases progressively up to the
regeneration limit.
Once the regeneration limit has been reached, post-injection is maintained until
all of the pollutant particles have been eliminated.
The post-injection flow and time are determined by cartographic maps, taking
into account the engine operating conditions.
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