What does the auto hold function in cars mean?

[VanRichard]

The auto hold function in cars is an automatic braking feature that simplifies operation by eliminating the need to use the handbrake or electronic parking brake once activated. In some car models, this function is labeled as AUTOHOLD, while in others, it is represented by a pair of semicircles enclosing the letter A inside a circle. Despite the different designs, the button serves the same purpose. Below is an introduction to the auto hold function: 1. The auto brake feature is an extension of the Electronic Stability Program (ESP), utilizing ESP to control the braking of all four wheels. 2. During this process, the ECU (Engine Control Unit) uses sensors installed on the vehicle to monitor the car's levelness and wheel torque, determining whether braking is necessary to prevent rolling. The braking force applied to the wheels is minimal—just enough to stop the vehicle from moving—ensuring that there is no severe lurch forward when the accelerator is pressed again to proceed.