What is the difference between DM and DM-i?
2 Answers
Here are the specific differences between BYD's DM-i and DM technologies: 1. Advantages: The DM-i Super Hybrid system is based on a high-capacity battery and high-power electric motor, relying primarily on the electric motor for vehicle propulsion. The gasoline engine mainly functions to charge the battery and only directly drives the wheels when additional power is needed, working in tandem with the electric motor to reduce load. This hybrid technology differs from traditional hybrid systems that depend heavily on the engine, resulting in more effective fuel consumption reduction. 2. Core components: The key component of BYD's DM-i Super Hybrid technology is the newly developed Xiaoyun plug-in hybrid dedicated engine, which comes in two versions – a 1.5L engine mainly used in Qin PLUS and Song PLUS models, and a 1.5T turbocharged engine for larger models like the Tang DM-i. 3. Driving modes: When the battery is sufficiently charged, the DM-i model's electric motor provides adequate power for all road conditions. When battery power is low, the DM-i system automatically determines whether to use electricity or fuel, or a combination of both, based on system operating conditions.
From a technical perspective, BYD's DM and DMI systems differ significantly. DM is a dual-mode hybrid system focused on power performance, featuring a larger battery that supports pure electric and hybrid switching, making it ideal for those who enjoy rapid acceleration. In contrast, DMI is a dual-mode intelligent hybrid system optimized with an improved engine and E-CVT, delivering lower fuel consumption—potentially under 4 liters per 100 km in daily driving—and smoother operation. In real-world tests, DM excels in high-speed hill climbing, while DMI proves more fuel-efficient and quieter during frequent urban starts. For those prioritizing daily economy and environmental friendliness, DMI is the better choice, whereas DM suits those seeking driving excitement. The two systems also differ in control logic, with DMI's intelligent algorithm ensuring the engine operates only within its most efficient range, a smarter approach than traditional designs.
