Recently, Sensata Technologies Holding N.N.V., The world's leading manufacturer of sensors and controls , successfully developed the second-generation differential pressure sensor (DPS), based on its industry-leading accuracy in emissions control And durability and get the attention of diesel car customers. High precision power emissions compliance <br> Sensata European micro-electromechanical systems (MEMS) engineering manager ArnoutvandenBos introduction, there are several factors that make Sensata DPS different. For example, a typical DPS product uses two sensing elements to measure differential pressure, whereas the Sensata DPS uses only one sensing element to measure differential pressure and achieves extremely high accuracy. Combining technology with digital signals A key dilemma for DPS manufacturers is ensuring that sour diesel exhaust will not damage the sensor or cause false pressure readings. Wrong pressure readings can cause the filter to fire at the wrong time, seriously damaging the exhaust system.
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TimTiek, global marketing manager for internal combustion engines and emissions at Sensata, says there was virtually no sensor available for emissions systems 10 years ago. Emissions systems are complex today, with automakers having to keep adding sensors to keep the system working.
DPS measures the differential pressure across the upstream and downstream of particulate filtration systems that capture harmful particulate emissions from diesel passenger cars and light commercial vehicles. When the differential pressure across the exhaust filter reaches a certain critical value, the DPS pressure reading triggers the filtration system to work: Increasing the temperature of the exhaust emission will reduce particulates and prevent clogging of the filter.
Tiek added that, based on customer feedback, Sensata's sensors are superior to similar products in terms of overall performance and accuracy.
Sensina USA MEMS design engineering manager GinamariaEspinoza-Garcia pointed out that this product design has several aspects that make it particularly strong and accurate. Sensata sensors deliver over 97% accuracy at low temperatures and over 99% accuracy at high temperatures, enabling superior emission control even at pressures below 1Bar. The DPS can operate from -40 degrees Celsius to 140 degrees Celsius (-40 degrees Fahrenheit to 284 degrees Fahrenheit).
In addition, the DPS signal enables a vehicle's electronic control unit to verify that the particle filter is functioning correctly, which is also a legal requirement. This feature, along with other capabilities of Sensata products, enables carmakers to meet the most stringent emission standards in the world.
JingChang, vice president and general manager of China's Sensor Business Unit, said that this has brought significant benefits to Chinese customers because the product technology can reduce diesel emissions that lead to large particles entering the air. With this product, Sensata China is currently supporting more than 80% of China's POC (particulate oxidation catalyst) and DPF (diesel particulate filter) projects.
Sensata worked with leading car manufacturers to conduct research and development to find the materials, processes and designs that best withstand acid exhaust. Sensata combined this knowledge with its state-of-the-art MEMS and single-edge SENT digital output signal conditioning to create a unique, second-generation DPS (patent pending) that is considered to be accurate and robust Industry Standard.
According to Tiek, Sensata's MEMS technology and SENT digital signals provide high accuracy and unparalleled robustness over the life of the sensor. SENT technology also enables Sensata's DPS to transmit temperature, transfer curves and other data simultaneously without the need for additional connectors and wires. As a result, customers can measure what they want to monitor with just a single DPS.
DPS is one of several robust sensor families that Sensata supplies for exhaust and aftertreatment systems. Another example is Sensata's high common-mode sensor (HCM) for the HVOR market. The sensor utilizes the same superior DPS technology to provide low-voltage accuracy in high-voltage environments.
Tiek also noted that Sensata serves clients in difficult applications where few companies are willing to cope. We continually capitalize on our extensive knowledge and expertise in exhaust gas atmospheres to further improve our DPS, HCM, high temperature sensors and other products designed for demanding operating environments.
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