Core Viewpoint - Great Wall Motors emphasizes its Hi4 hybrid technology as a more efficient alternative to Range-Extended Electric Vehicles (REEV), highlighting its advantages in energy management and performance under various driving conditions [1][5]. Group 1: REEV Pain Points - REEVs typically use a series structure where the engine only generates electricity, leading to issues with power consistency, especially at low battery states [2]. - A specific REEV model shows a significant drop in total driving power when the battery is low, resulting in reduced acceleration and potential safety risks [2]. - Energy loss in REEVs is inherent due to the lack of mechanical direct connection, with an estimated loss of about 10% [2]. Group 2: Hi4 Hybrid Technology - Great Wall's Hi4 hybrid technology, introduced in 2023, is designed for "all-condition travel," optimizing efficiency through dynamic switching and intelligent energy management [5]. - Hi4 technology is divided into two types: Hi4-T, which uses a mechanical drive, and Hi4-Z, which relies on electric motors for improved energy efficiency in urban settings [7]. - Hi4-Z features a power-splitting hybrid system with a longitudinal engine, multi-speed transmission, and two electric motors, allowing for versatile driving modes [9][11]. Group 3: Hi4-Z Performance and Efficiency - The Hi4-Z system can operate in various driving modes, including pure electric front-wheel drive and four-wheel drive, depending on the conditions [13]. - The maximum power output of the Hi4-Z system reaches 863 horsepower with a torque of 1195 Nm, while achieving a fuel consumption of 8.6L/100km under WLTC conditions [14]. - The system's complexity, including multiple components and power-splitting mechanisms, poses challenges for reliability and tuning, which may affect driving quality [14].