What is brake priority?

1. Definitions

In 2002, it was developed a “brake override system”, the Chinese translation for the brake (braking) priority system, referred to as BOS, that is, as long as you hit the brakes, regardless of throttle signal is What, fuel system once the oil is reduced to a minimum, along with the engine to idle status, the English called idle. Developed since 2002, this system has been unknown until it broke Toyota “pedal door”, announced after the massive global recall of a possible failure car, this security system is only known to most riders. “Brake override system” can ensure the owner in case of emergency is still able to stop the car, and will not finally lost their lives.

2, the working principle

“brake override system” works: first, to start the throttle when the brakes to work state, which means that the vehicle is running, I

[ 123] Pentium B50 schematic brake priority system to have the depth of accelerator pedal is depressed and held, followed by the left foot on the brake pedal, then the computer will transmit signals 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 at once, then it will feel “thump” in the car 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. and soWhen the foot off the accelerator to hit 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. 3, how to identify whether the car brake override system popular online There are currently two methods

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a try while maintaining the throttle opening degree or larger full throttle brake left foot, left foot off the accelerator and the brake, if the braking effect is no significant difference between that described with brake priority system, if they can clearly feel the braking force is insufficient, and the engine speed is not rapidly down to an idle state , it shows the brake override system is not installed. However, this method to be hurt on the body, and secondly, there is a certain risk, owners should try it yourself.

Second, there is a simple quantitative detection method. When both the brakes and the accelerator observed tachometer, if the rotational speed falls 1000rpm or less, is considered the BOS installed, if the rotational speed of 1500rpm or more, even if the deceleration of the car does not stop to the installation of the system considered.

4, prospects and significance

It is reported that Germany in the 1980s requires vehicles with brake override system devices, and now most German cars are equipped with this device; GM, Chrysler Some models are also equipped with a brake override system device; 2010, Japanese cars only a small percentage of the system is not installed, Korean cars are basically not installed the system. But with the occurrence of Toyota events, it was reported this technology is expected to become standard in the automotive industry. But to some extentPoint of view, this system is not practical such as ESP security configuration so strong. First, even if the accelerator is stuck, it can also form neutral gear, cutoff engine power input. Before much of the media has been done in the absence of this system, the braking distance is longer. But even without this system did not do, doing the same brake when the gear in neutral and will have much difference with the usual driving distance. Although not measured, it can be determined when the in-gear would certainly shorter distance, meaning that even without this system, a similar function can be achieved by other methods of operation. In addition, even a novice, there will only be possible to move the gas pedal as the brake pedal, but almost does not occur, step on the accelerator and brake with the situation. So the chance of this system really works is very small. So if it is not the vehicle throttle control problems, opportunities brake override system that can use very little. So now the riders too much attention on their own models whether to install the system does not make much sense. However, for riders, we still hope that you can install this system, after all, just spend 30-50 dollars in costs, can reduce the risk factor of driving, this is we are more willing to accept.