In April 2025, Cummins officially launched the industry's first turbocharger specifically designed for hydrogen internal combustion engines (H2-ICE) used in highway commercial vehicles. This product is not a simple adaptation of diesel or gasoline engine turbos; rather, it has been systematically restructured based on the combustion mechanisms of hydrogen, intake and exhaust characteristics, and emission requirements. It precisely addresses the unique challenges posed by hydrogen's low energy density, susceptibility to backfire, and the need for large amounts of air, providing crucial technical support for achieving "near-zero carbon emissions" in heavy-duty trucks and long-distance buses through green hydrogen internal combustion engines, thereby accelerating the engineering implementation of the hydrogen internal combustion engine route. Why must hydrogen internal combustion engines use "dedicated" turbos? Unlike traditional fuel vehicles, the combustion characteristics of hydrogen internal combustion engines impose new requirements on the boosting system: Increased air demand: To output the same power as diesel, hydrogen requires 2-3 times the amount of air (in a lean combustion state). However, the exhaust energy of hydrogen internal combustion engines is relatively low, and traditional turbos are inefficient at low exhaust temperatures and have poor stability at low flow rates, making it impossible to meet the demand for large air supply. Stringent safety boundaries: Hydrogen has a low ignition point and fast flame propagation, making the intake system prone to backfire and pressure fluctuations. Ordinary turbos lack sufficient safety redundancy, which could damage the compressor and intercooler. Special emission control requirements: Hydrogen internal combustion engines often use lean combustion to reduce NOx, necessitating precise control of exhaust temperature and back pressure to maintain the activity of after-treatment systems (such as SCR). The control precision of traditional turbos does not meet the standards. Core technological breakthroughs: Precise adaptation to hydrogen internal combustion engine operating conditions This dedicated turbo has achieved three major technological upgrades addressing the pain points of hydrogen internal combustion engines: Efficient aerodynamic dual-zone design: The compressor features a new generation of impellers and volute channels, covering both "high flow low pressure ratio" and "medium flow high pressure ratio" efficient ranges. This design meets the large air demand of hydrogen internal combustion engines while ensuring stable pressure output at low exhaust temperatures, resolving the contradiction of "high air demand + low exhaust temperature drive." Transient response optimization: By using lightweight impellers to reduce rotor inertia, the time from "accelerating to boost establishment" is significantly shortened, avoiding torque fluctuations and NOx peaks during acceleration, thus enhancing driving smoothness. Predictive intelligent control: The turbo integrates high-speed rotational speed and temperature-pressure sensors, operating in coordination with the engine ECU to predict control models. It can anticipate boost demands based on throttle changes, vehicle load, and road conditions, accurately matching air volume and reducing the risk of backfire and misfire from the source. Meeting safety and regulatory standards to support industry implementation To address the backfire risk in hydrogen internal combustion engines, the product is equipped with dual safety redundancies: the compressor reserves ample surge margin, combined with a rapid pressure relief valve to promptly release abnormal pressure; the system includes a backfire trigger mechanism that quickly reduces load and relieves pressure by linking the throttle and ignition system upon detecting anomalies, ensuring component safety. In terms of emission adaptation, the turbo can precisely control exhaust temperature and back pressure, helping the SCR system to activate quickly and maintain activity, consistently meeting future stringent emission regulations such as Euro VII, National VI, and the U.S. EPA 2027, particularly excelling in real driving emissions (RDE) scenarios. Industrial significance: Providing diversified options for zero-carbon transportation This turbocharger fills a critical gap in the powertrain of hydrogen internal combustion engines, making it possible for the hydrogen internal combustion engine route to transition from the laboratory to actual operation. Compared to fuel cells, hydrogen internal combustion engines can leverage existing commercial vehicle manufacturing and service networks, requiring lower initial investment costs, and can assist logistics and passenger transport fleets in achieving a zero-carbon transition during the phase of incomplete hydrogen infrastructure. As green hydrogen supply an
