What Causes the Abnormal Noise in Dual-Clutch Transmissions?
4 Answers
Abnormal noise primarily stems from the sound generated by the shift fork operation during gear changes in the transmission. To reduce this noise, improvements in the transmission's NVH (Noise, Vibration, and Harshness) performance are necessary, along with coordinated optimization in the vehicle's overall NVH development. Therefore, some level of abnormal noise is inherent in transmissions. Additional relevant information is as follows: 1. Note: Currently, the jerking issue in dual-clutch transmissions cannot be entirely avoided, but it can be largely mitigated through proper driving techniques, such as smoother throttle control with the right foot and mutual adaptation between the driver and the vehicle. 2. Advantages: Dual-clutch transmissions offer lower fuel consumption compared to traditional transmissions and provide nearly seamless gear shifts, giving them a significant edge over both automatic and manual transmissions.
I've been driving cars with dual-clutch transmissions for several years, and I often encounter abnormal noises. The most common causes are worn clutch plates or insufficient oil. The internal structure of a dual-clutch transmission is quite complex, like two manual transmissions put together. If you frequently use the semi-engaged state in stop-and-go traffic, the friction plates can wear thin and start making noise. Last time, I heard a clicking sound when shifting gears, and after inspection, it turned out the oil pressure sensor was also broken, affecting lubrication. If not addressed promptly, the gears could get damaged, leading to a major overhaul. So, even minor noises should prompt a check of the fluid levels and clutch condition. Maintaining smooth driving and avoiding hard acceleration is crucial.
My dual-clutch transmission had been making squeaking noises during starts for the past few days. After inspection by a mechanic, it was found to be a control module issue along with synchronizer wear causing abnormal sounds. Dual-clutch designs are precise but vulnerable to high ambient temperatures or excessive dust. When lubricant deteriorates, insufficient lubrication leads to gear collisions and noise. Frequent stops, starts, and acceleration in urban areas increase clutch load. I've also heard that electronic control unit failures can cause rough shifting and various strange noises. It's recommended to check transmission fluid at least annually, and avoiding sudden acceleration can delay the onset of abnormal sounds.
Dual-clutch rattling usually indicates mechanical issues, such as excessive gear clearance or bearing damage causing internal friction noise. I've experienced this problem and found the sound is most noticeable at low speeds, possibly due to excessive oil temperature causing expansion. Delaying repairs can jeopardize the entire transmission system, posing significant safety hazards. The most accurate diagnosis requires a professional scan tool at a repair shop—don't attempt DIY guesses.
