To meet increasingly strict emission regulations, modern direct injection (DI) combustion engines rely heavily on advanced exhaust aftertreatment systems. These systems are essential for converting harmful nitrogen oxides (NOx) into harmless substances and filtering out particulate matter (PM) from both gasoline and diesel exhausts. Continental has introduced innovative sensor solutions that enhance the control and efficiency of these aftertreatment systems, ensuring compliance with emission standards in China and globally.
The post-processing system integrates Continental's intelligent high-temperature sensor (HTS) and differential pressure sensor (DPS), offering fast response times and precise measurements. The second-generation HTS not only improves performance but also reduces system costs and maintenance efforts, making it a more efficient solution for manufacturers.
Mr. Fan Mingxiang, Sales Director of Continental’s Sensors and Actuators business unit in China, emphasized the growing importance of the aftertreatment market: “From a global perspective, this is a highly promising sector, and we have seen particularly strong demand in China. To meet these needs, Continental continues to develop new technologies aimed at reducing emissions. We are proud to introduce our second-generation high-temperature and differential pressure sensors to the Chinese market, helping our customers meet emission standards efficiently and reliably.â€
The current diesel exhaust gas cleaning process involves a diesel particulate filter (DPF), a diesel oxidation catalyst (DOC), and a selective catalytic reduction (SCR) unit. These components work together to ensure maximum conversion efficiency and filtration performance. Monitoring the entire system is crucial to maintain optimal operation under varying conditions.
Intelligent High Temperature Sensors (HTS) play a key role in this process. They provide critical temperature data across different parts of the exhaust system, ensuring that the aftertreatment system operates within the correct temperature range. Continental’s second-generation HTS uses thermocouple technology to convert temperature readings into accurate digital signals, which are then sent to the engine control unit (ECU). This enables optimal catalytic conversion and improved onboard diagnostics. In addition to enhancing performance, these sensors simplify system layout by using multiple probes for close monitoring and offer overheat protection for critical components like turbochargers. Since 2016, the second-generation HTS has been produced in Changchun, China.
Differential Pressure Sensors (DPS) are equally important, especially in gasoline direct injection (GDI) engines, which produce higher levels of particulate matter compared to traditional fuel-injected engines. The DPS works in conjunction with the particulate filter to measure the pressure difference across the filter, allowing the system to detect when soot accumulation reaches a critical level. At a predetermined pressure threshold, the engine control unit initiates a regeneration process to clean the filter and restore normal exhaust flow.
Continental’s PFD (Particulate Filter Differential Pressure Sensor) provides either an analog or digital output proportional to the pressure difference, enabling precise control and timely regeneration. This technology ensures that the particulate filter remains effective over time, contributing to cleaner emissions and better engine performance.
Mr. Fan Mingxiang added, “Continental’s sensor and actuator team has strong capabilities in the development and production of these critical components. I believe our local team will continue to deliver excellent service and support to our customers in China.â€
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