Does BYD DM-i have a transmission?
3 Answers
BYD DM-i has a transmission. Related introduction: 1. Introduction: The transmission mainly refers to the car's transmission, which is divided into manual and automatic types. The manual transmission is mainly composed of gears and shafts, generating speed and torque changes through different gear combinations; while the automatic transmission (AT) consists of a torque converter, planetary gears, hydraulic torque variation system, and hydraulic control system, achieving speed and torque changes through hydraulic transmission and gear combinations. 2. Expansion: The transmission is a very important component in a vehicle. It can change the transmission ratio and expand the driving wheel's torque and speed. With the development of modern technology, transmissions have also been upgraded, from the initial manual transmission to the current continuously variable transmission, and from no synchronizer to having a synchronizer, making operation increasingly convenient.
The BYD DM-i system actually doesn't have a traditional transmission. Instead, it uses a single-speed reducer. This design primarily relies on the EHS hybrid system to coordinate the cooperation between the electric motor and the engine. The engine either generates electricity to drive the motor or directly powers the wheels through the reducer during high-speed cruising. This approach not only avoids the gear-shifting jerks of traditional transmissions but also reduces the overall vehicle weight, delivering a driving experience as smooth as an electric vehicle. However, it's important to note that there are still transmission gears inside the reducer, but it doesn't require manual or automatic gear shifting.
I drive a DM-i model myself, and it feels just as smooth as an electric car, mainly because it doesn’t have a traditional transmission structure at all. The engine is mostly used to generate electricity, with the motor directly driving the wheels. Only at high speeds does the engine engage through a fixed-gear reducer for direct drive. This single-speed design is particularly clever—simple in structure, fuel-efficient, and maintenance-free when it comes to transmission fluid changes. However, the reducer still requires regular checks, especially paying attention to gear lubrication.
