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Control Strategy
Based on the functional requirements, usage scenarios, reliability, and applicability of the customer's control object, control strategies and technical specification documents can be developed using Rapid Control Prototyping (RCP) tools. Parent company E-Quality and Kreation are particularly skilled in control strategies for diesel/natural gas engines, fuel cells, AMT transmissions, construction machinery, vehicle functions, powertrain domain control, NOx sensor control, O2 sensor control, ultrasonic sensor control, and more.
Application Software
Model-Based Software Development (MBSD) technology is used to develop application software models, conduct offline simulation tests (open-loop, closed-loop, etc.), and perform data calibration based on control strategies. According to U.S. industry experience, model-based software development is five times faster than hand-written code.
Basic Software
Includes scheduling systems (complex controls require an operating system), simple drivers (input signal acquisition, actuator drive signal implementation such as relay switch drives, PWM drives, high-side drives, low-side drives, etc.), and complex drivers (for differential signal processing or timing-based signal drives).
Hardware Design
Based on the requirements of different types of controllers, the design of input signal processing circuits, power supply circuits, communication circuits, MCU system circuits, and drive circuits is completed, along with PCB design. Functional and performance tests are conducted during the A-sample phase. The B-sample phase involves DV testing (including functional tests, environmental reliability, and EMC tests) and sample finalization. Complex controllers typically undergo C-sample phase for PV testing, small-scale production, and trial deployment.
Testing and Verification
Following the V-model development process, testing activities are integrated throughout the development cycle. Testing begins with system requirement decomposition and planning, followed by test case design during software development. Test execution includes laboratory bench tests, engine bench validation, and vehicle validation.
The NOx sensor is one of the core components of the diesel engine exhaust aftertreatment system—SCR (Selective Catalytic Reduction). It provides fundamental NOx concentration data for the SCR control system. Based on the NOx concentration, the SCR controller calculates the appropriate urea mass to be injected at the SCR inlet, resulting in low NOx emissions at the SCR outlet, typically 20-30 ppm for Euro VI/China VI standards.
The three core components of NOx sensors: SCU (Sensor Control Unit), ceramic chip, and product packaging. The first two are more technically challenging, while product packaging requires engineering expertise and debugging.
Kreation's latest generation of products meets the emission regulations of Europe (Euro VI), China (China VI), the U.S., Japan, South Korea, and other regions, achieving OEM-level quality.
The NOx Sensor Control Unit (SCU) is one of the three core components of the product. Kreation uses self-developed ASIC chips to design control schematics and PCBs, along with intelligent control algorithm groups. Through intelligent software and hardware, the system achieves high precision, reliability, and stability.
Caption:
Based on self-developed ASIC chips, the schematic and PCB are designed. A 32-bit high-performance MCU is used to implement three-stage coupled oxygen pump control, heating control, CAN communication, and fault diagnosis control based on zirconia solid electrolyte (coupling control of three current-type and three voltage-type solid electrolyte cells).
Oxygen pump control, heating control, CAN communication, and fault diagnosis control rely not only on hardware but also on software control strategies and algorithms. Kreation's software algorithm groups not only achieve these functions but also address the issue of inconsistent static accuracy of the probe. Additionally, the underlying software implements XCP calibration (automotive industry standard), J1939 communication protocol, and CAN communication flashing (no need to open the casing for flashing).
The third core technology of the NOx sensor is product packaging and testing. Automated processes are used to fill sealing materials around the complex ceramic chip, assemble the inner/middle/outer protective covers, and perform base riveting and welding, as well as connecting the harness probe. Each probe undergoes leak testing and height testing. After packaging, the probes undergo a long-term (12+ hours) activation test.
