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POWERTRAIN SYSTEMS
Delphi Ammonia Sensor
Delphi CorporationWorld Headquarters5725 Delphi DriveTroy,
Michigan 48098-2815 USA
Delphi Corporation. All Rights Reserved
Tel: (1) 248.813.2000 | www.delphi.com | 1
Description
The Delphi Ammonia Sensor uses aunique Delphi technology to
directlymeasure ammonia levels in the exhaustof diesel vehicles
equipped with aselective catalytic reduction (SCR)aftertreatment
system. The sensoroutput can be used to provide feedbackto the SCR
system helpingprovide optimal reduction of NOxemissions.
In a diesel engine SCR system, theammonia sensor is typically
situatedbehind the SCR catalyst. The SCR systemhelps reduce NOx
emissions in dieselpowertrain systems through a chemical
reaction in which ammonia reacts withNOx to produce nitrogen and
water.Ammonia is typically introduced into the exhaust stream
upstream from the SCR in theform of liquid urea. The ammonia sensor
detects excess ammonia in the exhaust gasallowing for more precise
dosing of urea. This added precision allows for optimal SCRsystem
efficiency and prevents the release of excess ammonia into the
atmosphere.
The Delphi Ammonia Sensor can detect ammonia within a range of 0
to 100 ppm. Ifthe sensor detects too much ammonia, it signals the
system to reduce the amount ofthe urea injection. The planar
alumina substrate in the Delphi Ammonia Sensorcombines an integral
temperature sensor with a thick-film heater for optimumperformance.
The Delphi Ammonia Sensor provides measurement of ammonia
withoutinterference from carbon monoxide and NOx.
Benefits
y Provides optimized performance of an SCR convertery Enables
the use of an optimally sized SCR convertery Provides diagnostics
capability for problems with urea storage, for example,
if the tank is empty or contains another substancey Helps
provide SCR system diagnosticsy Enables optimal aftertreatment
architecture (Eliminates requirement for a post
oxidation catalyst)
Delphi Ammonia Sensor
7/29/2019 et_ammonia.pdf
2/2
POWERTRAIN SYSTEMS
Delphi Ammonia Sensor
Delphi CorporationWorld Headquarters5725 Delphi DriveTroy,
Michigan 48098-2815 USA
Delphi Corporation. All Rights Reserved
Tel: (1) 248.813.2000 | www.delphi.com | 2
Typical Applications
The Delphi Ammonia Sensor is intended for use in vehicles
equipped with an SCRconverter system including light-duty,
medium-duty and heavy-duty diesel vehicles tohelp manufacturers
meet increasingly stringent NOx emissions regulations.
Availability
The Delphi Ammonia Sensor is currently in development and
targeted for production in2010. Engineering samples available upon
request. Contact Delphi for further information.
Performance Advantages
The Delphi Ammonia Sensor helps the SCR converter operate at
high efficienciesallowing for the most cost-effective means of
meeting stringent NOx emissionsregulations. The sensor provides
required diagnostic feedback for ureaquality/tampering and for
proper operation of the aftertreatment system.
The Delphi Advantage
Exhaust sensors are increasingly important elements in today's
engine managementsystems, helping to provide accurate engine
control and system diagnostics. Delphioffers a wide range of
exhaust sensors to help vehicle manufacturers meet current
andfuture emission regulations.
Delphi has one of the industry's most complete portfolios of
sensors and a thoroughunderstanding of the entire engine management
system. Delphi offers globalmanufacturing capabilities for sensors
and an in-depth knowledge of regional marketrequirements. With more
than 25 years of experience in exhaust sensor research
andproduction, Delphi can provide products tailored to specific
customer requirements.
