用GM复杂问题解决工具RedX解决新产品开发过程中降低产品和工艺的风险归纳.pdf
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ABSTRACT
In today's dynamic automotive environment, reducing the
lead-time to introduce new product technologies to the
market place can be a key competitive advantage. Employing
proactive risk reduction techniques to define key product and
process relationships is essential to enhance the production
worthiness of a design while it is still in the advanced
development phase of the program.
This paper describes how Delphi Powertrain Systems applied
the Shainin proactive risk reduction methodology in
advanced product development to focus resources on
understanding and mitigating the risk associated with the
development of a new Delphi ammonia sensor.
Organizational and technical strategies to accelerate profound
knowledge capture, along with corresponding test results, are
presented and discussed.
Due to the proprietary nature of the Delphi ammonia sensor's
function and operation, this paper limits the disclosure of
detailed product characteristics and specifications to generic
nomenclature, while still maintaining the technical intent of
the paper.
INTRODUCTION
The Delphi ammonia sensor uses a unique Delphi technology
to directly measure ammonia levels in the exhaust of Diesel
vehicles equipped with a selective catalytic reduction (SCR)
aftertreatment system. The sensor output can be used to
provide feedback to the SCR system helping provide optimal
reduction of NO
x
emissions.
In a Diesel engine SCR system, the ammonia sensor is
typically situated behind the SCR catalyst. The SCR system
helps reduce NO
x
emissions in Diesel powertrain systems
through a chemical reaction in which ammonia reacts with
NO
x
to produce nitrogen and water. Ammonia is typically
introduced into the exhaust flow upstream from the SCR in
the form of liquid urea. The ammonia sensor detects excess
ammonia in the exhaust gas allowing for more precise dosing
of urea and onboard diagnostics (OBD) functionality. This
added precision allows for optimal SCR system efficiency
and prevents the release of excess ammonia into the
atmosphere.
The Delphi ammonia sensor is typically used to detect
ammonia within a range of 0 to 200 ppm. It is based on a
planar alumina substrate with an integral temperature sensor
and a thick-film heater for optimum performance. The sensor
is equipped with two sensing electrodes. The first electrode
outputs the concentration of ammonia as a voltage while the
second electrode outputs the concentration of NO
2
as a
voltage. Because the ammonia electrode is cross-sensitive to
NO
2
, the voltage from the NO
2
electrode is used as a
correction factor to improve the accuracy of the ammonia
sensor. [1]
AMMONIA SENSOR
The Delphi ammonia sensor (Figure 1) uses a unique Delphi
technology to directly measure ammonia levels in the exhaust
of a Diesel vehicle equipped with an SCR aftertreatment
system. Electrical power is supplied by a sensor controller
through an electrical harness with additional connector pins
for data communication.
Risk Reducing Product and Process Design During
New Product Development
2010-01-0391
Published
04/12/2010
Peter Bovenzi, Don Bender, Ray Bloink and Michael Conklin
Delphi Corporation Advanced Powertrain - USA
John Abrahamian
Shainin LLC
Copyright ? 2010 SAE International
czq131452007
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