DENSO Develops Exhaust Gas Temperature Sensor With Improved Temperature Detection Accuracy
21 April 2009
DENSO extended the length of the probe and developed a vibration-resistant structure to support it. Click to enlarge. |
DENSO Corporation has improved the temperature detection accuracy of its newly developed diesel exhaust temperature sensor. The new sensor, which is located in front of the diesel particulate filter (DPF) and used to control temperature for DPF regeneration, helps reduce harmful diesel emissions and improves fuel efficiency by enabling more precise control of aftertreatment systems.
To improve the sensor’s temperature accuracy, DENSO increased the probe length to almost twice that of the conventional product and extended the sensing tip into the exhaust pipe. The company achieved this by developing a vibration-resistant structure with an anti-resonance pipe to support the probe, or sheath pin, at its optimal position.
Also, 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, or sensing element, which improves detection accuracy to plus or minus 10 degrees Celsius compared to that of the conventional product of plus or minus 30 degrees Celsius. 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. In addition, because less fuel is needed for DPF regeneration, less fuel is mixed in the engine oil, which helps prevent the engine oil from deteriorating.
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.
—Masahiko Miyaki, managing officer responsible for DENSO's Powertrain Control Systems Business Group
In addition, DENSO also expects an increase in gasoline-powered vehicles with turbochargers to meet the demand for higher engine power as downsizing progresses. To help control the turbocharging system’s temperature more precisely, the company plans to apply the new vibration-resistant technology to a gasoline exhaust temperature sensor that can withstand heavy vibrations when mounted near the turbocharger.
The new probe will be installed on heavy duty and medium duty diesel vehicles sold in the US in fall of 2009. It will also be installed to vehicles sold in Japan and Europe in 2010.
Nice one DENSO.
I am so tired of everyone wondering if someone would EVER produce a really good diesel exhaust temperature sensor.
This just might be it.
Posted by: ToppaTom | 21 April 2009 at 10:56 PM
I AM CURIOUS AS TO THE APPLICATIONS FOR THE AIRCRAFT INDUSTRY. JET ENGINES NOTORIOUSLY BURN TONS OF FUEL. APPLY ALSO TO AUXILLIARY POWER UNITS. GAS TURBINE SYSTEMS. CONSIDERING THE GLOBAL SCALE OF APPLICATION TO HIGH TEMP SYSTEMS, BLANKET APPLICATION COULD MEAN REAL NUMBERS REDUCTIONSIN CO2. AFTER MARKET/RETROFIT APPLICATIONS COULD HELP
Posted by: GLENBECK | 24 April 2009 at 07:33 PM