This product is specifically designed for the BYD472QA 1.5L Xiaoyun plug-in hybrid专用engine in the BYD Qin PLUS DM-i. It is a core sensing component in the engine electronic control management system—the crankshaft position sensor. The crankshaft position sensor acts as the engine's "heartbeat monitor," detecting the crankshaft's rotational angle and speed in real time, providing the ECU with precise reference signals for ignition timing, fuel injection control, and speed monitoring, ensuring smooth engine starts and efficient operation.

The Xiaoyun 1.5L naturally aspirated engine in the BYD Qin PLUS DM-i features Atkinson cycle operation with an ultra-high compression ratio of 15.5:1 and a maximum thermal efficiency exceeding 43% [11†L16-L17]. This engine has extremely stringent requirements for ignition timing and injection precision. The crankshaft position sensor serves as the "timing commander" of the engine management system, with its signal accuracy directly affecting power performance, fuel economy, and emissions compliance [5†L3-L4]. This product is developed and manufactured strictly according to BYD OEM technical standards, utilizing Hall effect operating principles with high-precision integrated circuits to detect changes in the crankshaft trigger wheel teeth, outputting stable and reliable square wave signals. The product passes rigorous high-low temperature cycle tests and durability tests, providing direct replacement for faulty original sensors to restore normal engine operation.