Denso’s newly developed diesel exhaust temperature sensor
In an effort to contribute to cleaner emission and better fuel efficiency Denso corporation has developed a new diesel temperature sensor capable of controlling temperature for diesel particular filter(DPF) resulting in reduction in harmful diesel emissions and improved fuel efficiency. The DPF is the process of recovering the DPF’s filtering capability by burning the particulate matter (PM) which is trapped in the device due to catalytic reaction.
Denso achieved the improved sensor’s temperature accuracy by increasing the length of the probe by almost two fold of conventional product and further extended the sensing tip into the exhaust pipe according to DENSO. This achievement was result of developing a vibration resistant structure with an anti-resonance pipe to support the probe, or sheath pin at its optimal position. Since the temperature of DPF regeneration needs to be controlled under 650 degrees Celsius in order for the DPF to maintain its capability, the sensor is equipped with a newly developed thermistor, or sensing element capable of improving detection accuracy to plus or minus 10 degrees Celsius in comparison to the conventional product which is being plus or minus 30 degrees Celsius. These two developments contribute in improving the sensor’s temperature detection accuracy of the most intensely heated part of the DPF, its core.
The new temperature sensor is targeted to be installed on heavy duty and medium duty diesel vehicles to be sold in U.S. in fall of 2009 and it will be installed to vehicles to be sold in Japan and Europe in 2010.