Every time you mention the quality problem of Audi's double clutch, there is a large number of "lever essences" that reply to you with such words, have you heard of PDK? Ultra-luxury brand Porsches all use a double clutch, must be you will not open.
It is precisely because of Porsche's endorsement that in the eyes of many Chinese people, the double clutch is advanced and represents the future! The structure is complex! Transmission is efficient! The result is fuel efficient! Audi is conscientious! Dual clutch is not bad! Low-speed bumps don't exist, that's your footwork! Overheat protection is impossible, that's your violent driving! But the question is, are Porsche's dual clutches the same thing as Audi's dual clutches? Aside from being both dual-clutch transmissions, what do they have in common? Just like you and Ma Huateng are both surnamed Ma, you tell me Ma Huateng cow x, so you also cow x, I can go to your bar! PDK's set of dual clutches can buy a golf! How big is the difference between PDK's dual clutch and Audi's dual clutch?
The structure is actually similar, whether it is Audi or PDK's dual-clutch transmission, the structure is actually similar. Both are via two input axes, one clutch for odd gears and the other for even gears. When the vehicle is put into one gear, the other clutch and the corresponding next gear are already in the ready state, as long as the current gear is separated, the next gear can be immediately engaged.
Because of the lack of hydraulic torque converter cushioning, the engine and the gearbox are directly rigid connections, and the impact of the gear shift is strong, so even the PDK's dual clutch can not avoid low-speed setbacks. If Porsche is priced so high, why doesn't PDK add a torque converter? That's because Porsche is a sport luxury brand, performance is also its focus, if equipped with torque converter, no matter how evolved, can not break through the 90% soft connection efficiency ceiling, and mechanical hard connection efficiency can reach more than 90%. The real gap between Audi and PDK's dual clutch is that the cost PDK transmission is jointly developed and manufactured by Porsche and ZF, and the cost is very high, and the cost of a gearbox is close to that of a Golf vehicle. On the hardware side, due to the use of alloy materials with better heat resistance and wear resistance, and even two separate circulating oil circuits to help cool the gearbox, the life and thermal decay performance of the gearbox are significantly improved. In the software, a huge amount of money was spent to optimize the transmission control logic, making the gear shift operation of this gearbox more intelligent. The effect of this is also very obvious, in normal mode, PDK dual-clutch shift time is only 0.04 seconds, sports mode can reach 0.02 seconds, can withstand 50 consecutive ejections without attenuation, can withstand up to 1000N.md torque. All of this results in the PDK Dual Clutch – the best dual-clutch transmission in the world.
All in all, the strength of the Porsche PDK is that because it is mounted on Porsche, it can allow it to improve its own shortcomings at any cost, even if this gearbox has the disadvantage of low speed and setback, but whether it is shift speed, shift logic, service life, extreme sports performance, and Audi dual-clutch transmission can not be the same day. In addition to the PDK dual-clutch other dual-clutch transmissions, sorry, I chose the AT.