1. the BOS brake priority system
brake priority system (Brake Override System, BOS) is a means to let the driver depresses the accelerator pedal and the accelerator is fully opened (i.e., throttle in the end) of the case, when the brake pedal is still able to stop the car system, which means that brake override system detects the driver tried to brake is not successful, the engine automatically switches to the idle state.
Compared with the vehicle brake priority system without this system, the braking distance will be significantly shorter, thus greatly improving safety of the vehicle.
brake override works
ldquo; brake override system rdquo; working principle is: first, to start the throttle when the brakes to work state, which means that the vehicle the process of moving, we first accelerator pedal and keep the depth, followed by the left foot under the brake pedal, then the computer will pass the signal to the throttle sensor and the fuel injection signal to a minimum. The system is divided into: mechanical throttle cable with electronic throttle and electronically controlled, but no matter what the form of implementation, the final results are the same, brake and throttle to avoid a fight, resulting in brake failure. In an example cable type accelerator pedal, the engine has a throttle switch at the top, have an upper semicircular wire pulled. The wire leads directly to the throttle pedals. When a step on the gas pedal, the wire pulled the throttle switch to open the throttle. But in fact there is the wire connecting two throttle switch. Wherein a is the gateway to the accelerator pedal, the other buffer is pulling a throttle. Because if there is no buffer, when a foot release the gas pedal, throttle back to idle immediately, then in the car will feel ldquo; thump rdquo; about channeling the car, very comfortably with the car. So when release the throttle, throttle due to a buffer, not all of a sudden the throttle down, but slow down. When the accelerator pedal is depressed greater the intensity, the more obvious the effect of the throttle buffer. So when looseOpen the throttle to step on the brakes, the car brakes brake is not just inertia, as well as high-speed operation of the engine! Because the throttle is not yet fully returned to idle. Brake priority system allows the throttle oil supply system immediately return to the idle position, even if the other foot to step on the accelerator, or throttle stuck, do not give the engine fueling. Even normal braking (braking is not under such extreme conditions while throttle condition), and a vehicle equipped with a brake system without the system preferentially compared to the braking distance will be significantly shortened, so the safety performance of vehicles It has greatly improved.