What are the components of an electronically controlled automatic transmission?
2 Answers
An electronically controlled automatic transmission mainly consists of a torque converter, planetary gear transmission system, shift actuator, hydraulic control system, electronic control system, cooling device, etc. Among them, the torque converter is an important component of the hydraulic automatic transmission, installed on the engine's flywheel. Here are the extended details: 1. The torque converter increases the engine's output torque and transmits it to the planetary gear system, enabling continuously variable transmission within a certain range. 2. The gear transmission system achieves the ultimate goal of changing the transmission ratio and direction. 3. The shift actuator drives the planetary gear mechanism to work, forming a new power transmission path, which is the so-called "shifting." 4. The hydraulic control system uses solenoid valves to control the action of the shift valve based on the driver's intention and changes in driving conditions to achieve the shifting process. 5. The electronic control system mainly determines the gear and shift points based on signals from the vehicle speed sensor and throttle position sensor, outputs shift commands, and generates hydraulic signals through solenoid valves to control the action of the shift valve, realizing the automatic shifting process. 6. The cooling device maintains the oil temperature within the range of 80°C to 90°C.
As a car enthusiast, I often ponder the inner workings of transmissions. An electronically controlled automatic transmission has several key components. First is the torque converter, which transfers power through fluid and acts as a buffer; then comes the planetary gear set, consisting of components like the sun gear and planet carrier, enabling gear shifts. The hydraulic system includes an oil pump to generate pressure and a valve body that directs fluid flow to clutch packs or brake bands, facilitating gear changes. The electronic control relies on various sensors—such as the vehicle speed sensor and throttle position sensor—to gather data, which is sent to the ECU (Electronic Control Unit). The ECU analyzes this data and drives solenoid valves to execute precise shifts. Collectively, these components work in harmony to ensure smooth, seamless gear transitions, enhancing driving comfort. Regular transmission fluid changes help prevent valve body clogging and extend service life. I've tried maintaining it myself a few times and found it quite rewarding.
