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Stellantis has introduced a new 1.6-liter turbocharged 4-cylinder hybrid powertrain that combines performance, efficiency, and capability without the need for plugging in. This innovative system integrates a turbocharged engine with a two-motor hybrid transmission, delivering an estimated 37 mpg combined city/highway while providing seamless electric power for optimal results. It debuts in the 2026 Jeep Cherokee, offering 210 horsepower and 230 lb.-ft. of torque, setting a benchmark in the midsize SUV segment.
Key Highlights
- Hybrid Efficiency: Achieves an estimated 37 mpg combined through a proprietary Hybrid Drive Control Unit that optimizes power distribution between the engine, motor-generators, and battery.
- No-Plug Design: The system integrates electric power without requiring a plug, enabling short-distance EV mode up to 62 mph using a 1.03-kWh lithium-ion battery.
- Engine Specs: The 1.6-liter turbocharged 4-cylinder produces 177 horsepower at 5,500 rpm and 221 lb.-ft. of torque between 2,000-3,500 rpm, assembled at the Dundee Engine Plant in Michigan.
- Transmission Features: Includes two motor-generators and a planetary gearset for dual power flows—electrical and mechanical—supporting modes like EV, hybrid, and regenerative braking.
- 4×4 Capability: Standard Jeep Active Drive I system with Selec-Terrain modes (Auto, Sport, Snow, Sand/Mud) for automatic torque distribution between axles.
- Emissions Compliance: Meets SULEV 30 standards with a close-coupled catalytic converter and is adaptable to future regulations.
The powertrain balances performance and efficiency with a variable power split transmission. Stellantis’ proprietary software continuously manages interactions between the engine and transmission components. The engine, originally developed in Europe and adapted for U.S. hybrid use, features a high-pressure direct injection fuel system. It operates with a 11.3:1 compression ratio and Miller Cycle combustion, which delays intake valve closing for better efficiency. A liquid charge air cooler reduces intake air temperature, while the turbocharger provides up to 38 psi of boost. The engine block and head are made from high-pressure die-cast aluminum.
Electrically driven pumps for engine and battery cooling, along with the air conditioning compressor, reduce engine load to enhance overall efficiency. The hybrid transmission splits engine power into two flows using key components like two motor-generators and a planetary gearset. At startup, motor-generator 1 uses battery energy to spin the engine, eliminating a traditional starter.
In EV mode, with sufficient battery charge and light driver demand, motor-generator 2 delivers torque through the gearset for zero-emission driving at low speeds. Hybrid mode allows the engine to generate electricity via motor-generator 1 while providing wheel torque, with motor-generator 2 supplementing as needed. Regenerative braking captures kinetic energy, converting it to electricity stored in the battery, which also handles reverse propulsion.
The system includes a Dual Motor Power Inverter (DMPI) with an integrated DC-DC converter to maintain the vehicle’s 12-volt supply and boost high voltage for extra torque. The liquid-cooled high-voltage lithium-ion battery supports propulsion up to 62 mph for short distances and powers the AC compressor, reducing engine runtime during city driving for better fuel economy and lower emissions.
Capability is a hallmark of the Jeep brand, and the Cherokee maintains this with standard all-wheel drive. The Jeep Active Drive I 4×4 system features a Drivetrain Control Module (DTCM) that enables front-wheel drive for efficiency or four-wheel drive for performance. It automatically adjusts torque between front and rear axles based on demand, with Selec-Terrain offering modes for various conditions.
Stellantis, a leading global automaker, focuses on customer freedom in mobility through technologies and value creation. Its portfolio includes brands like Chrysler, Dodge//SRT, Jeep, Ram, Alfa Romeo, FIAT, and Maserati. For more details, visit the company blog.
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