Technology Types Links Troubleshooting and Diagnostics

Technology Types Links Troubleshooting and Diagnostics
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Exhaust Gas Recirculation (EGR) Valves
EGR systems reduce the nitrogen oxides that are formed in the
combustion chamber of the engine, by lowering the combustion
temperature. EGR systems are widely recognised for reducing nitrogen
oxides in diesel engines. In petrol engines, EGR is primarily used for dethrottling the engine to reduce fuel consumption – the reduction of
nitrogen oxide is a secondary function.
Technology Types
The main types of EGR valve are pneumatic and electric:
Pneumatic EGR valve system features:
- Flexibility
- Lower energy consumption
- Low size and weight
- Low cost
- Controlled pneumatically – a vacuum controlled diaphragm
box actuates the valve stem in a manner that allows the
cross-section of the valve opening to be varied as needed
Electric EGR valve system features:
- Calibrated in the engines performance map
- Highly dynamic for fast adjustment of the operating point
- Good metering throughout the engines performance range
- High EGR rates
- Simple and direct control
- High reliability and operational performance
- No servo energy (no pneumatics)
- Low nitrogen oxide emissions
- Reduced fuel consumption in petrol engines
Troubleshooting and Diagnostics
The most common cause for malfunctions in the EGR system
are seized or carbonised EGR valves:
Causes
- Soot particulates, carbon deposits and oil are all
contaminates which can cause the valve to stick, potentially
preventing it from opening or closing.
- Damage to valves may also be caused by exposure to
excessively high temperatures.
- On pneumatic style valves, malfunctions may also be caused
by faults in other vacuum system components such as
vacuum pumps, vacuum lines and solenoid valves so these
should also be checked.
Symptoms
- Faulty EGR valves result in jerking, irregular idling or
insufficient engine power.
Solution
- If EGR valves are faulty then it is important to replace rather
than attempt to clean them.
-
Many EGR valves have to be adapted to the engine ECU after
being fitted. This can be done by self-adaptation of the
components with a test drive or through prompts that appear
on the diagnostic tool. Pierburg recommends adaptation to
be carried out via the diagnostic tool.
Links
Click on the links below
to find out more...
Range Coverage
Pierburg is the European market leader for EGR and emission control
with units being installed as OE in many modern vehicles.
For more information visit the Part Info website or speak to your local
motor factor…
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