What is the Start-Stop Function?
3 Answers
Start-stop function refers to the engine automatic start-stop function. The engine automatic start-stop means that when the vehicle temporarily stops during driving (such as waiting for a traffic light), the engine automatically shuts off. When it is time to move forward again, the system will automatically restart the engine. It is abbreviated as STT, which is a system that controls the engine's start and stop. Below is a partial introduction to the start-stop function: 1. Function: The function of the automatic start-stop is that when the vehicle is driving and needs to stop, the engine will automatically shut off; when it is time to drive again, simply depress the clutch, and the engine will automatically start, saving time. 2. Working Principle: The working principle of the start-stop system is that when the vehicle needs to stop due to congestion or at an intersection, the driver can press the brake pedal, stop, and shift to neutral. At this time, the Start/Stop system automatically detects conditions such as: the engine is idling and not in gear, the wheel speed sensors of the anti-lock system show zero, and the electronic battery sensor indicates there is sufficient energy for another start. The entire process remains in D gear.
When I first bought my car, I found the start-stop function quite interesting—it automatically shuts off the engine when stuck in traffic or waiting at a red light, then silently restarts when I press the accelerator. This clever design saves a lot of fuel; during my daily 30-minute city commute, it probably reduces fuel consumption by around 10%. At first, though, the sudden engine shutdown felt a bit disorienting, especially on hot days when the restart caused a slight vibration, but I got used to it after a few weeks. Environmentally, I’ve heard it helps reduce emissions and combat air pollution. Of course, in heavy traffic, the starter wears out faster—my neighbor complained about quicker battery drain—but overall, it’s worth it, especially with rising fuel prices. Every bit saved is a bit earned.
Having worked as a car mechanic for over a decade, I see the start-stop function as an ingenious automated device: It uses sensors to constantly monitor vehicle speed and brake status. When the car stops for a few seconds, the ECU commands the engine to shut off, and it instantly restarts when the accelerator is pressed. This can save 5%-15% of fuel consumption in daily driving and reduce pollution, but the drawbacks are also evident. For instance, the battery must be upgraded to a durable AGM type, otherwise regular batteries can't withstand frequent starts. I've repaired many cars where this function caused premature battery failure, requiring nearly a thousand yuan for replacement. There's also the risk of starter wear, but the overall design is safe—owners just need to check the electrical system more often during maintenance. Modern cars have optimized anti-shake features, so there aren't major issues. If you drive more on long trips, the system will be more durable.
