How does the QX55's variable compression technology work?

The variable compression technology in the QX55 is designed to enhance engine performance and efficiency by dynamically adjusting the compression ratio as needed. This feature allows the engine to optimize performance under various driving conditions, providing both power when necessary and improved fuel economy during lighter driving scenarios.

When the vehicle requires more power, such as during acceleration or when climbing hills, the system can increase the compression ratio to harness maximum energy from each power stroke. Conversely, when cruising or operating under less demanding conditions, it lowers the compression ratio to allow for more efficient fuel combustion. This adaptability is what sets this technology apart, making it effective across a range of driving situations.

The other choices suggest limitations or conditions that do not accurately represent how this technology functions or its benefits. Maintaining a fixed compression ratio would not allow for the flexibility required for both performance and efficiency, while only improving performance in sport mode or increasing fuel consumption contradicts the technology's purpose of enhancing efficiency along with power. Thus, the ability to adjust the compression ratio on-the-fly is key to the innovation and effectiveness of the QX55's engine performance.