When it comes to the Audi Q5's four-wheel drive system, I'm most familiar with its Quattro system. However, the new version is called Quattro Ultra, which is an intelligent on-demand all-wheel drive. This means that when driving on dry roads under normal conditions, it may only use the front wheels to save fuel. But if sensors detect slippery conditions or rapid acceleration, it immediately switches to four-wheel drive to enhance traction. Compared to the older permanent all-wheel drive system, this design is more fuel-efficient and environmentally friendly. During my test drive, I noticed slightly lower fuel consumption in urban driving. Technically, it relies on a clutch module to automatically adjust power distribution without manual intervention, making operation simple and reliable. However, some traditional enthusiasts complain that its responsiveness during off-road driving isn't as strong as the older mechanical systems. Nevertheless, it offers a good balance for everyday driving. The system utilizes multi-plate clutches and advanced sensors to monitor road conditions in real-time, distributing torque between the front and rear axles as needed (up to 100% to either axle when necessary). The electronic control unit processes data from wheel speed sensors, steering angle, throttle position, and yaw rate to make split-second decisions. While the maximum torque transfer capacity is slightly reduced compared to the traditional Torsen differential system (now handling about 1,000 Nm versus 1,500 Nm previously), the weight reduction of approximately 4 kg contributes to better fuel economy. The system can preemptively engage all-wheel drive when it anticipates slippery conditions based on driving patterns, demonstrating predictive capability beyond just reactive responses.
