AutomaticThe functionality (auto hold) is becoming more common in day-to-day driving, but many car owners know only that it can “stop and lock” without knowing the technical logic behind it. Based on years of experience, i've seen a lot of small problems caused by a car owner's mishandling, and today i've deciphered its core principles from a professional point of view, helping you to get a complete picture of this practical configuration
Automatic stationing is not a stand-alone function, but is carried out through a coordinated effort by the body stabilization system (esp) and the electronic handbrake (epb). When the vehicle reaches full brake status (usually 5 km/h), the system passes by wheel speedSensorsWhen the wheel is static, commands are automatically sent to the electronic handbrake module, the driver's clamps are locked and the wheel drive is completed. During this process, esp will collect body attitude data (e. G. Slopes, horizontal acceleration) in real time, and dynamically adjust brake strength (e. G., on ramps), the system will proactively increase power to prevent vehicles from slipping by gravity. And when the driver stomps on the gas, the system detects engine output twists, confirming that the power is enough to overcome static resistance before the electronic hand brakes are removed in an instant
Trigger and release mechanisms: precision of the sensor and algorithm
The trigger for the automatic stationing requires two requirements: first, that the vehicle has been activated and that the driver presses the physical “auto hold” button (when the dashboard light is on); and, second, that part of the model requires the driver to fasten his seat belt, which is a security design consideration — to avoid the operator having an error in the system trigger while at the driving position. Dismantling mechanisms are more intelligent: for automatic blockages, light step on the oil door is sufficient; manual blockages need to be accompanied by both “step-down” and “strike-in-the-step” actions, and the system determines the driver's start-up intent through the signal of the clutch position sensor and the blocker sensor, and is then deactivated. It should be noted that if a vehicle is static for a long time (usually more than 30 minutes, with slightly different models set), the system may switch to a long-actuated stationary mode, at which point it will be necessary to press the electronic handbrake manually to disarm
Different from the nature of the traditional electronic handbrake
Many car owners confuse automatic stationing and electronic hand brakes, which are completely different applications and control logic. The traditional electronic handbrake (epb) is essentially a “manual electronic version handbrake”, which requires the pilot to press the pressure button to activate or deactivate it for long periods of time (e. G. Roadside fire breakers, etc.); while the automatic stationing is a “smart temporary brake”, which automatically triggers and deactivates the entire journey and is specially designed for short periods of time (e. G. Red lights, congestion sections and vehicles). In control logic, electronic hand brakes are fixed, while automatic stationary power adjusts to the dynamics of the body — for example, on the wet slide surface, the system reduces the power output threshold at the break and avoids wheel slippage. Based on experience, the correct distinction between the two scenarios can effectively prolong the life of the electronic hand brake module
Automatic stationing has replaced traditional hand-to-hand brake operations with smart algorithms that have significantly reduced driving fatigue in urban congestion, especially when the ramp starts to break the pain of “sliding cars”. But what needs to be reminded is that it's only auxiliary, not a complete substitute for the driver's sense of safety. – for example, in extreme road conditions (e. G. Ice and snow) there is still a need to operate the gas doors and brakes carefully to ensure the safety of the cars. I hope this piece of dismantling will help us use auto-stationing more scientifically and make driving easier
