What is the A-circle button in an automatic transmission?

[LaAlyssa]

Automatic transmission A-circle button is the Auto Hold system. The Auto Hold system is a technological application that enables automatic handbrake functionality while the car is in motion. This technology allows drivers to avoid prolonged braking when the vehicle comes to a stop, and it prevents unnecessary rolling of the vehicle when the automatic electronic parking brake is engaged. Below is an introduction to the Auto Hold system: Principle: The working principle of the Auto Hold system lies in the brake management system controlling the four-wheel brakes through the extended functionality of the electronic parking brake (EPB). In other words, the Auto Hold system is an extension of the electronic parking brake (EPB), controlled by the ESP component. Working process: When the vehicle is temporarily stopped and needs to be restarted within a short period, the parking function is handled by the ESP-controlled brakes. The computer uses a series of sensors to measure the vehicle's levelness and wheel torque, determining any tendency for the vehicle to roll. It then applies an appropriate braking force to the wheels to keep the vehicle stationary.