How to Solve the Jerking Sensation of a 7-Speed Dual Clutch?
2 Answers
7-speed dual clutch jerking can be resolved by optimizing the hydraulic cylinder control unit. The hydraulic cylinder pushes the clutch plates to create friction, reducing vibration and thereby minimizing jerking. Below is relevant information about dual clutches: 1. Types: Dual clutches come in wet and dry types. Compared to wet dual clutches, dry dual clutches have relatively poorer stability, mainly because the clutch assembly is not immersed in oil, which prevents heat dissipation. This is particularly problematic in urban traffic congestion where semi-engaged states are frequent, leading to increased friction and heat generation. In such cases, clutch plate materials with better heat resistance can be used. Since semi-engaged states can reach temperatures around 300°C, materials with superior heat resistance must be selected. 2. Causes of Jerking: Dual clutch transmissions are prone to jerking at low speeds, primarily because they lack a torque converter. Instead, they rely on friction plates to directly transfer torque to the drive shaft. While this avoids the power loss associated with torque converters, the absence of a torque converter's cushioning effect means that the two sets of clutch plates can create a noticeable impact during gear shifts. Similar to manual transmissions, dual clutch transmissions also experience a semi-engaged state during power transfer. To reduce clutch plate wear, engineers design the clutch pressure plate and friction plates to engage quickly. However, if there is a significant difference between the engine output speed and the transmission output speed, jerking can occur.
After driving for so many years, I've encountered the jerking issue with 7-speed dual-clutch transmissions quite often, especially in low-speed situations like traffic jams. Possible causes include worn clutch plates needing replacement, or the transmission control software requiring an update. You could first try simple solutions, like visiting the dealership for a software refresh - this is called TCU flashing, which often resolves the jerking. Another common issue is dirty or aged transmission fluid; changing it every 40,000 kilometers or so can improve smoothness. Driving habits matter too - avoid frequent braking and accelerating at low speeds, and practice gentle starts and gear shifts. If these don't work, then the clutch assembly needs inspection, and repairs could cost several thousand yuan. Don't delay to prevent worsening problems. Remember, regular maintenance is key. Warming up for a minute or two before long drives can extend transmission lifespan.
