What does the Buick Excelle 6-speed DSS intelligent start-stop transmission mean?

[SadieMarie]

It refers to the system that controls the engine start and stop. Here is more related information: How the start-stop system works: 1. The working principle of the start-stop system is that when the vehicle stops moving due to congestion or at an intersection, the driver presses the brake pedal and shifts to neutral. At this time, the Start/Stop system automatically detects: the engine is idling and not in gear; the wheel speed sensor of the locking system shows zero; the electronic battery sensor shows there is enough energy for the next start. 2. After these three conditions are met, the engine automatically stops running. When the traffic light turns green, the driver presses the clutch, and then can activate the "start-stop device" to quickly start the engine. In automatic transmission models, as soon as the brake is released or the steering wheel is turned, the engine will automatically ignite immediately, and the driver can step on the accelerator to start, with the whole process remaining in D gear.

[McCecilia]

As a long-time owner of the Buick Excelle for five years, the most intuitive experience with this 6-speed DSS Intelligent Start-Stop Transmission is its fuel efficiency and smoothness. The six-gear design keeps the RPM lower during highway cruising, resulting in noticeable fuel savings. DSS stands for Dynamic Shift System, where the computer automatically matches the optimal gear based on throttle input, and it downshifts particularly quickly when climbing hills. The most practical feature is the start-stop function at red lights—the engine automatically shuts off and restarts instantly when you release the brake. However, I’ve noticed that in heavily congested traffic, this function can cause a slight delay in acceleration, so I manually turn off the start-stop button in such situations. I change the transmission fluid every two years as per the maintenance manual, and even after 80,000 kilometers, it still runs as smoothly as new.

[SanZoey]

As an auto mechanic, we've disassembled this type of transmission many times. The key lies in the integrated start-stop control module, which directly coordinates engine starting and transmission operation. When you brake to a stop at a red light, the system instantly cuts off power transmission while automatically shifting to neutral. Upon releasing the brake, the electronically controlled clutch can re-engage within 0.4 seconds, twice as fast as conventional transmissions. Special attention should be paid to its hydraulic control unit, which contains three independent solenoid valves specifically designed for start-stop conditions. During maintenance, dedicated Dexron VI transmission fluid must be used - regular ATF fluid will cause gearshift jerks. Additionally, AGM start-stop specific batteries are mandatory, as regular batteries would fail within six months due to frequent starting cycles.

[SanSerenity]

The salesperson gave me a detailed explanation of this system when I bought the car. Essentially, it integrates start-stop technology on top of a traditional 6AT transmission. The smartest feature is its predictive function: it anticipates traffic lights ahead based on navigation and adjusts gears in advance. For example, when I drive on Binjiang Avenue every day, it knows to downshift and slow down at the second intersection. The L gear on the gear lever is the low-speed mode, which is particularly powerful for climbing slopes in underground garages. However, the start-stop function becomes less frequent when the air conditioning is on in summer, as it prioritizes cooling. I remember the 4S dealership upgraded the transmission software for free during the first maintenance service, and now the gear shifts are smoother than before.

[KarterLynn]

Compared to my previous 4AT car, this transmission is a qualitative leap. The six gears keep the engine speed always in the optimal range, with urban fuel consumption controlled at around 7L/100km. The intelligent start-stop system isn't just about shutting off the engine - the entire power connection is handled with remarkable finesse. The system only activates when the brake is pressed to a specific depth, avoiding accidental triggering. Plus, with vibration suppression technology, you can barely feel any shake when the engine restarts. The transmission's lifetime maintenance-free design is worry-free, only requiring periodic fluid condition checks. If there's any drawback, it's that the start-stop is disabled for the first two minutes during cold starts, which consumes slightly more fuel in cold weather.

[LaAsher]

After studying General Motors' transmission technical documentation, DSS refers to Dynamic Shift Strategy. It doesn't solely rely on RPM for gear shifts, but comprehensively considers over twenty parameters including throttle opening, gradient, and load, essentially equipping it with a driving style learning chip. I've tested the sport mode, where downshifts and rev-matching are particularly aggressive, capable of dropping two gears when accelerating out of corners. The most critical component of the start-stop system is the reinforced starter, designed for a lifespan of 300,000 start-stop cycles. There's a practical tip: lightly pressing the brake won't trigger engine shutdown, only firm pressing will, allowing manual control over start-stop frequency. It's recommended to disable start-stop in prolonged congested traffic, as frequent starts can affect transmission fluid temperature.