At present, many domestic automotive manufacturers are actively developing their own hybrid vehicles based on the Honda i-MMD hybrid system. This article explores the key technologies that make the i-MMD system a standout in the world of hybrid powertrains.
The Honda Accord i-MMD hybrid system is designed with a unique configuration, consisting of an Atkinson cycle engine, a clutch, and two motors arranged in a three-axis layout. The engine is connected to the output shaft via a clutch, while the generator is connected through a gear before the clutch. The motor is directly linked to its output shaft, and a third shaft between the engine and motor transmits power to the wheels.
The system operates in three main drive modes: pure electric (EV), series hybrid, and parallel hybrid. In EV mode, the engine is off, and the motor provides power directly through the gear mechanism. In series hybrid mode, the engine generates electricity, which powers the motor. In parallel hybrid mode, both the engine and motor contribute to driving the vehicle.
What makes the i-MMD system intelligent is its advanced control strategy, which optimizes fuel efficiency across all operating conditions. The system not only improves efficiency within each mode but also intelligently switches between modes to maximize overall performance.
In hybrid and engine drive modes, the controller adjusts the engine’s operating point to enhance efficiency. This is illustrated on an engine map showing different operating points under varying conditions. By optimizing these points, the system ensures the engine runs at its most efficient level.
The switch between EV and hybrid modes allows for intermittent hybrid operation, improving speed in low-load situations. Similarly, switching between hybrid and engine drive modes helps maintain efficiency during different driving scenarios—such as high-speed cruising or intense acceleration.
The iMMD system also features an Atkinson cycle engine, known for its excellent fuel economy but lower power output. However, this is balanced by the electric motor, which compensates for the lack of power. The engine uses a dual-cam system (VTEC + EVTC) to switch between Otto and Atkinson cycles, enhancing efficiency without sacrificing performance.
In terms of motor design, the first-generation iMMD motor incorporates reluctance torque to improve efficiency under low-load conditions. It also uses a high-voltage system (up to 700V) to achieve compactness and strong performance.
Overall, the Honda i-MMD hybrid system represents a significant advancement in hybrid technology, combining smart control, efficient engine design, and powerful motor systems to deliver superior fuel economy and driving experience.
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