Denso Corp. said it has improved the temperature detection ac- curacy of its newly developed
diesel exhaust temperature sensor. The
new sensor will be installed on medium-and heavy-duty diesel vehicles sold in
Japan and Europe. It will also be used in
vehicles sold in the U.S.A.
“Denso’s improved exhaust gas
temperature Sensor is a result of the
company’s continuous efforts to develop
products that enable our customers to
reduce emissions and improve fuel econ-
omy of diesel systems,” said Doug Patton,
senior vice president of Engineering at
Denso International America. “The accu-
racy improvement, due to the extended
probe length, will allow customers to
more precisely control their diesel
aftertreatment systems, helping improve
the emissions and fuel economy.”
The sensor is positioned in front of the
diesel particulate filter (DPF). To improve
the sensor’s temperature accuracy,
Denso said it increased the probe length
to almost twice that of the conventional
product and extended the sensing tip
into the exhaust pipe. This was achieved
by developing a vibration-resistant struc-
ture with an anti-resonance pipe to sup-
port the probe at its optimal position.
While the temperature of DPF regeneration needs to be controlled under
650°C for the DPF to maintain its capability, the sensor is equipped with a newly
developed thermistor designed to
improve detection accuracy to ± 10°C.
These two developments improved the
sensor’s temperature detection accuracy of the most intensely heated part of
the DPF — its core.
With the improved temperature detection performance, the new sensor helps
regenerate DPFs more efficiently, resulting in cleaner emissions, as well as
increased fuel efficiency due to less fuel
required in the DPF regeneration process,
the company said. In addition, because
IMPROVED EXHAUST GAS TEMPERATURE
SENSOR FOR DIESEL AFTERTREATMENT
Denso said it has improved the temperature detection accuracy of its newly developed diesel exhaust temperature sensor, which is used as part of the aftertreatment
system in medium- and heavy-duty vehicles.
less fuel is needed for DPF regeneration,
less fuel is mixed in the engine oil, which
Denso said helps extend oil service life.
“With more stringent emissions regulations and increasing environmental
awareness, Denso expects an increase
in requirements to improve diesel exhaust aftertreatment technologies,
which also will increase the demand for
highly precise and extended exhaust
gas temperature sensors,” said Masahiko
Miyaki, managing officer responsible for
Denso’s Powertrain Control Systems
Business Group.
The new sensor technology is also
being applied in petrol engines, the
company said, in response to the continuing emphasis on improved power
density from smaller engine platforms.
Denso said it will apply its vibration-resistant technology to a petrol exhaust
temperature sensor that can withstand
heavy vibrations when mounted near
the turbocharger. ;
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