
Both types of transmissions are available. The differences between them are as follows: 1. Principle: The 6AT, due to the insufficient range of automatic torque variation by the hydraulic torque converter, connects several rows of planetary gears behind the turbine to improve efficiency. The hydraulic control system automatically operates the planetary gears according to changes in engine operation, thereby achieving automatic speed and torque variation. The CVT's conical discs can tighten or loosen under the thrust of hydraulic pressure, squeezing the steel belt to adjust the width of the V-shaped groove. When the conical discs move inward and tighten, the steel belt is pushed outward from the center of the circle under the pressure of the discs, and vice versa. This changes the diameter of the disc driven by the steel belt, thus altering the transmission ratio. 2. Usage: The 6AT does not require a clutch to shift gears, has fewer gear changes but larger variations, and provides smooth connections, making it easy to operate. It offers convenience for the driver and comfort for passengers. The CVT, lacking the transmission gears of a conventional automatic transmission, eliminates the gear-shifting process of an automatic transmission, thereby removing the associated gear-shift jerkiness. As a result, the CVT's power output is linear, providing a very smooth driving experience in actual use.

I often talk about cars with others, and when it comes to transmissions, it's not as simple as just saying CVT or AT. Toyota has many models, like the well-known Corolla or Vios, which are compact cars mostly equipped with CVT continuously variable transmissions. They drive smoothly without any jerking and are particularly fuel-efficient, though some people feel the power response is a bit slow during sudden acceleration. For the SUV series like the RAV4 or Highlander, some newer models use AT automatic transmissions, such as the 8AT structure, which shifts crisply and is suitable for off-road needs. Hybrid models like the Prius use e-CVT, a name that sounds like CVT but is actually a planetary gear system that ensures smooth acceleration. So when buying a car, you need to look at the specific model—not all Toyotas are the same—and I recommend test driving to feel the differences.

From a technical perspective, Toyota's transmission choices are based on vehicle design. The CVT (Continuously Variable Transmission) is used in economy models, where continuous gear shifting allows the engine to operate at peak efficiency, significantly reducing fuel consumption. I've tried my friend's Corolla CVT version, and it's indeed smooth. The AT (Automatic Transmission) is more common in traditional combustion vehicles, featuring multiple physical gears. The 8AT used in the RAV4 is a typical example, offering direct and reliable power delivery. Toyota's hybrid series refers to its system as e-CVT, but it's actually a motor-driven system that seamlessly connects to avoid gear-shift shocks. The key lies in driving preferences: CVT is comfortable for city commuting, while AT performs better on rugged terrain.

I've been driving a hybrid for years. The transmission in the hybrid system is called e-CVT, with its core being two motors working in tandem with a planetary gear set, delivering an almost imperceptible acceleration process and ultra-quiet operation. Conventional gasoline cars like the Corolla gasoline version mostly feature pure CVT, which is compact and fuel-efficient but requires regular fluid maintenance for long-term use. Off-road models like the Prado use AT to handle heavy loads with stability and durability. In conclusion, choose the appropriate transmission type based on your needs.

When servicing vehicles, common transmission issues require distinguishing between CVT and AT. CVTs are prone to slippage due to delayed oil changes, while ATs have a simpler structure, longer lifespan, but slightly higher fuel consumption. Toyota typically equips sedans with lightweight CVTs, while SUVs feature transmissions like 8AT to ensure traction. Hybrid e-CVTs require less maintenance. It's recommended to choose based on usage habits and conduct regular inspections to prevent failures.

Transmission Evolution: From Early 4AT to Modern CVT, Pursuing Eco-Efficiency. Models like Vios Adopt CVT for Fuel Economy, While SUVs Like Land Cruiser Stick to AT for Enhanced Performance. Hybrid e-CVT Introduces Innovative Design. Choose Based on Budget and Usage to Match Lifestyle Needs.


