How to tell if there is a brake priority system?

The method of distinguishing the brake priority system is as follows:

1. Try to keep the throttle fully open or full throttle, and brake hard with your left foot, which is different from letting go of the throttle with your left foot. If there is no obvious difference in braking effect, it means that the braking priority system is installed. If you can clearly feel that the braking force is insufficient and the engine speed does not fall back to the idle state quickly, it means that the brake priority system is not installed.

But this method is harmful and dangerous to the car body. Don't try it yourself.

2. There is a simple quantitative detection method. That is, the brake and the accelerator are pressed at the same time, and the tachometer is observed. If the speed is lower than 1000 rpm, it is considered that BOS is installed. If the speed is above 1500 rpm, even if the car slows down and stops, it is considered that the system is not installed.

Extended data:

Brake override system (BOS) refers to a system that allows the driver to stop the car by depressing the brake pedal even when the accelerator pedal is depressed and the accelerator is fully open (that is, the accelerator pedal is depressed to the bottom), that is, when the brake override system detects that the driver's attempt to brake is unsuccessful, it will automatically switch the engine to the idle state.

Working principle of brake priority system:

Brake priority means that under any circumstances, when the driver steps on the brake pedal, the brake system will work and execute instructions.

In previous cars, the brakes were very dependent on the engine. When the engine throttle is fully open, most of the braking force will be lost. Nowadays, with the support of electronic system, cars can often change independently of engine speed. Netizens who have paid attention to the brake door incident know that most of the accidents occurred when the engine accelerator was deeply stepped on. Therefore, the specific function of brake priority is to ignore the throttle signal when braking and forcibly reduce the engine speed, even if the engine is running at high speed.

References:

Brake priority system-Baidu encyclopedia