China’s Chery Holding has announced the completion of initial testing on its first mass-production-ready diesel-hybrid engine, developed under the new RLEY Power Technology brand. This 2.5-liter turbocharged unit marks a significant step for the company and the Chinese automotive industry, representing the nation’s first domestically-produced diesel-hybrid powertrain slated for mass production. The new engine is the result of a joint venture between Chery and Quanchai Power, and aims to balance performance with increasingly strict emissions standards.
Chery Holding’s new power brand, RLEY Power Technology, successfully completed initial testing of its first mass-production-ready diesel-hybrid engine this fall. The 2.5-liter, turbocharged diesel unit was specifically designed for hybrid powertrains and is the first of its kind to reach the manufacturing stage in China. This milestone signals a new direction in diesel-hybrid development and represents a key component of Chery’s performance-focused engine strategy.
Strategic Move in Diesel-Hybrid Development
The new brand is a joint venture between Chery and Quanchai Power, created to introduce a modern diesel-hybrid system to the company’s product offerings. The collaboration combines Chery’s expertise in powertrain development with Quanchai’s experience in diesel engine manufacturing, alongside support from local industrial development initiatives. This approach integrates government guidance, industry collaboration, and market insights, enabling rapid technological advancement and large-scale production.
The new diesel-hybrid engine focuses on reducing mechanical losses and ensuring quick, precise control. Optimized specifically for hybrid systems, the engine’s calibration strikes a balance between power, fuel efficiency, and driving comfort, making it suitable for a variety of applications. This development comes as automakers globally explore alternative powertrain solutions to meet increasingly stringent emissions standards.
High Efficiency, Compact Design, Smooth Operation
Development of the engine incorporated a modern combustion chamber design, electronically controlled high-pressure common rail fuel injection, an efficient turbocharger, and a variable displacement oil pump. By minimizing friction losses and optimizing bearings, the engine achieves a thermal efficiency of 47% even under heavy load. Emissions are reduced through a built-in EGR module and direct placement of exhaust gas treatment, resulting in a responsive and clean operation.
Addressing the weight and space constraints inherent in hybrid powertrains was a key priority. Developers focused on a lightweight structure and integrated component design. Combining multiple functions into single units reduces the number of parts, while the use of modern, high-strength lightweight materials minimizes overall weight. The integrated structural layout and topological optimization result in an engine approximately 10% lighter than previous generations.
Frequent start-stop cycles, characteristic of hybrid systems, present unique acoustic and vibration challenges. These were addressed during the design phase through computer simulations and combustion chamber optimization, achieving lower noise and vibration levels for a smoother driving experience during mode transitions.
Designed for Global Applications
The diesel-hybrid system is initially featured in the RELY P3X model, which debuted at the Chengdu Auto Show in August. The engine’s high efficiency and low fuel consumption offer advantages in vehicle markets where long-distance driving or versatile use are key considerations. According to the manufacturer, the thermal efficiency and range exceeding 1300 kilometers demonstrate that hybrid powertrains aren’t limited to gasoline engines.
Chery aims to have a presence in traditional gasoline, electrified, and now diesel-hybrid technologies, building a comprehensive powertrain portfolio. The launch of RLEY Power completes this structure and contributes to strengthening the international presence of Chinese diesel technology.
Source: cherycvglobal.com
GÉPmax Knowledge Base: Diesel-Hybrid – A hybrid powertrain where electric motor(s) and a battery work in conjunction with a diesel engine: the diesel provides range and efficiency under heavy load, while electric assistance improves responsiveness, reduces consumption, and minimizes noise and vibration, particularly beneficial for frequent start-stop driving, towing, or long-distance operation.
