Selective catalytic reduction (SCR) is a chemical process converting nitrogen oxides (NOx) into diatomic nitrogen and water as well as a small amount of carbon dioxide. This process is facilitated by the addition of automotive-grade urea – known as Diesel Exhaust Fluid (DEF) or commercial brands like AdBlue and Bluetech – to convert hazardous NOx emissions from diesel engines into harmless nitrogen and water.
SCR功能块的工作原理
SCR模块控制泵从储罐中抽出DEF，并用适当的计量阀将其注入柴油机废气中。为了优化燃油效率，在催化还原过程之后使用气体传感器，然后将气体传感器的信息输送到柴油引擎ECU，后者将该信息与引擎状态相结合，向SCR单元提供有关待释放的正确DEF液体量的准确信息。
我们的产品和解决方案
我们为常用的无刷直流（BLDC）电机提供一系列三相栅极驱动器和功率MOSFET，以及SPC5 32位微控制器和带有调压器和CAN与LIN接口IC的专用电源管理IC，从而简化高效解决方案的设计过程。
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eDesignSuite
eDesignSuite is a comprehensive set of easy-to-use design-aid utilities ready to help you streamline the system development process with a wide range of ST products.
Thermal-electrical Simulators for Components
Power Management Design Center
Choose design tool: 
Select ratings and application waveforms Get junction temperature and blocking voltage graphs Search and sort suitable devices 
Select ratings and application waveforms Estimate power losses Search and sort suitable devices 
Supports long mission profiles Provides power loss and temperature graphs Helps define heatsink thermal properties 
Help select the right ViPOWER Automotive power device Supports load-compatibility, wiring harness optimization, fault condition impact and diagnostic analysis Supports various PCB configurations 
Specify system ratings and surge waveform Search and sort suitable devices
AC Switches Simulator
Select ratings and application waveforms Get junction temperature and blocking voltage graphs Search and sort suitable devices Rectifier Diodes Simulator
Select ratings and application waveforms Estimate power losses Search and sort suitable devices STPOWER Studio
Supports long mission profiles Provides power loss and temperature graphs Helps define heatsink thermal properties Twister Sim
Help select the right ViPOWER Automotive power device Supports load-compatibility, wiring harness optimization, fault condition impact and diagnostic analysis Supports various PCB configurations TVS Simulator
Specify system ratings and surge waveform Search and sort suitable devices Choose design tool: 
SMPS design, by topology, by type and by product PFC design with analog and digitial control Supports various PCB configurations 
Handles AC-DC and DC-DC design in common topologies Displays interactive and annotated schematic Provides current/voltage graphs, Bode plots, efficiency curves and power-loss data 
Provides a step-by-step optimized design of power section and control loop Generates the STM32Cube embedded software package for custom applications and allows firmware project generation, compatible with multiple STM32 IDEs 
Specify input/output power for each node in the tree Check for consistency Design each individual node
Power Supply Design Tool
SMPS design, by topology, by type and by product PFC design with analog and digitial control Supports various PCB configurations Choose type: DC/DC AC/DC 太阳能电池充电器
LED Lighting Design Tool
Handles AC-DC and DC-DC design in common topologies Displays interactive and annotated schematic Provides current/voltage graphs, Bode plots, efficiency curves and power-loss data Choose type: DC/DC AC/DC
Digital Power Workbench
Provides a step-by-step optimized design of power section and control loop Generates the STM32Cube embedded software package for custom applications and allows firmware project generation, compatible with multiple STM32 IDEs Choose type: LLC VIENNA
Power Tree Designer
Specify input/output power for each node in the tree Check for consistency Design each individual node Power Supply Design Tool
Power Supply Design Tool
Active Filters
Comparators
Current Sensing
LED Lighting Design Tool
Rectifier Diodes Simulator
STPOWER Studio
AC Switches Simulator
Power Supply Design Tool
TVS Simulator
Power Supply Design Tool
LED Lighting Design Tool
NFC Tuning Circuit
NFC Inductance