Differences Between BYD DM-i, DM-p, and EV
In BYD's powertrain planning, DM (Dual Mode) plug-in hybrid is divided into two branches: i and p. The former emphasizes fuel efficiency and offers a lower starting price, while the latter focuses on performance, commanding a higher price. EV (Electric Vehicle) represents purely electric drive; both belong to the category of new energy vehicles.

DM-i stands for DualMode-intelligent, signifying an intelligent, efficient dual-mode system. It mainly relies on high-power electric motor drive and a large-capacity power battery for energy, with the engine playing a secondary role. The system operates with high efficiency, aiming primarily at fuel economy. In DM-i, the traditional gasoline engine plays a crucial role in influencing overall efficiency. It pairs with BYD's Xiaoyun series engine, which boasts a top thermal efficiency of 43%, ranking among the best in current mass-produced engine thermal efficiencies.

DM-p stands for DualMode-powerful, indicating a dual-mode system that emphasizes robust power performance. It primarily consists of two architectures: one is "three engines, four-wheel drive" (i.e., P0+P3+P4), and the other is "dual engines, four-wheel drive" (i.e., P0+P4), focusing on acceleration and stability in handling.

For instance, considering the Tang DM-p, it has a combined power of up to 452kW (615 horsepower), accelerating from 0-100 km/h in just 4.3 seconds. The super-smart electric four-wheel-drive system, through the vehicle's torque control and distribution strategy, allocates the appropriate torque to the front and rear drive units based on different speed curves under different speeds and loads. This ensures a stable vehicle posture under varying road conditions.
https://www.ml-vehicle.com/info/differences...econdary%20role.