What are the pros and cons of the auto hold function in cars?
2 Answers
Advantages of auto hold: In situations requiring short stops such as traffic lights, the system automatically brakes the wheels after the vehicle comes to a complete stop to prevent rolling. During hill starts, the system automatically applies brakes to prevent backward sliding, and releases the wheels automatically when starting to move forward. There's no need to pull the handbrake when parking and locking the car - the system will automatically brake the wheels (though this feature is only available on certain models). Disadvantages of auto hold: If the auto hold function remains active during reversing, it means the vehicle cannot be controlled for slow movement by braking. Poor throttle control in this situation may lead to accidents. The auto hold function also produces noticeable jerking when engaged. The working principle of auto hold: For temporary stops when quick restart is needed, the parking brake is controlled by ESP. The computer uses multiple sensors to measure vehicle levelness and wheel torque, determines any rolling tendency, and applies appropriate braking force to keep the vehicle stationary. When temporary parking exceeds a set duration, the braking system switches to mechanical rear-wheel parking instead of the initial four-wheel hydraulic braking. When preparing to move forward, the electronic system detects throttle pressure and (for manual transmission models) clutch pedal travel to determine when to release the brakes.
As a commuter who drives in the city every day, the auto-hold function is a lifesaver for me! Especially during the morning rush hour in congested areas, I don't have to keep my foot on the brake pedal, which makes driving much more relaxed. It also eliminates the fear of rolling back when starting on a slope, significantly improving safety. However, there are noticeable downsides: when reversing, you need to lightly press the accelerator to disengage it, and once I almost hit the garage wall; during parking waits, the system continuously applies pressure to the brake discs, which may increase fuel consumption and brake system wear over time. Additionally, if you're unaware of the auto-hold status when starting, there's a half-second delay in throttle response, which can lead to impatient honking from drivers behind.
