Dongfeng Motor has unveiled its self-developed Mach 1.5-litre turbo hybrid petrol engine, which has achieved a maximum thermal efficiency of 48.09% and received the "Energy Efficiency Star" certification, according to a local news agency.

This is the first hybrid petrol engine in the Chinese market to surpass the 48% thermal efficiency threshold. The engine uses a specific combustion method, a compression ratio exceeding 15.5, a high-energy ignition system, and a 500-bar fuel-injection system. These features are intended to improve fuel combustion efficiency and speed.

Key hybrid-specific components, including a variable-geometry turbocharger, valve-seat-free design, and electric variable valve timing, have been optimised to maintain airflow across the full engine speed range.

Additional technical measures include an integrated electric-motor oil pump and a thermal-spray coating of the cylinder bore, along with more than ten other design elements.

These measures reduce mechanical losses, allowing the engine's high-efficiency operating range to cover more than 50% of its total operation.

According to Dongfeng, these modifications affect fuel efficiency and power delivery across various driving conditions, from urban traffic to highway cruising. The company states that the engine allows an approximate 10% increase in range under equivalent fuel conditions.

In comparison with other automakers, the Mach 1.5-litre turbo's 48.09% thermal efficiency exceeds commonly cited benchmarks.

Toyota's hybrid Atkinson-cycle engines, including those in the Prius and the Dynamic Force family, achieve around 40-41% efficiency under optimal conditions.

Recent Chinese hybrid engines, such as those from BYD, have reported thermal efficiencies of approximately 46-46.5%.

The Mach 1.5-litre turbo engine adds to China's range of hybrid powertrains as automakers adjust to stricter fuel consumption standards and increasing demand for lower-emission vehicles.