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on may 27 this year, the ministry of industry and information technology publicly solicited opinions on the "technical requirements and test methods for passenger car braking systems", which added "for type a and vehicles with both type a and type b electric regenerative braking systems, in advance "the braking effect achieved by releasing the accelerator pedal cannot decelerate the vehicle to a stop".

this is the so-called "single pedal mode", which improves the vehicle's cruising range by enhancing the efficiency of kinetic energy recovery. however, lifting the accelerator pedal has a significant deceleration effect and can even stop the vehicle completely. the document stated that drivers may develop corresponding driving habits by controlling the accelerator pedal for braking and parking for a long time, causing them to mistakenly press the pedal during emergency braking conditions.

this regulation was originally made for driving safety, but xiaotong noticed that in the new draft opinion released recently, the ministry of industry and information technology made adjustments to the content of "prohibiting single-pedal complete braking mode of cars". for type a and vehicles with both type a and type b electric regenerative braking systems, the following requirements should be met:

1. in the default working state, the braking effect achieved only by releasing the accelerator pedal should not decelerate the vehicle to a stop;

2. if the electric regenerative braking system has more than one working state, it should re-enter the default working state after each power-on or set the working state according to the driver's requirements. the vehicle manufacturer should provide free instructions through user manuals or electronic data records. provides setting methods for working status;

3. if the electric regenerative braking system is outside the default working state, optical signals should be used to continuously remind the driver. the prompt information should be clearly visible even in the daytime.

the concepts of "single pedal mode" and "kinetic energy recovery" are similar, but the final effect of the two is different. the former is the vehicle stopping, while the latter is idling. the original regulations only allowed "kinetic energy recovery", but the new regulations allow "single pedal mode", but car companies cannot set it as the default state, and users should enter the default settings or user-set mode every time they start. , and finally provide continuous optical signal prompts after entering this mode, that is, displayed on the instrument panel, central control screen or hud.

in addition, the document also changes the brake light power requirements during energy recovery. for specific changes, please see the table produced by xiaotong. you should know that the requirement for the "type a electric regenerative braking system" in the "gb 21670-2008" standard is that it "cannot light up", and the final adjustment can promptly remind the rear vehicles and other traffic participants to avoid as much as possible traffic accidents such as rear-end collisions.

but it makes people think deeply: why can a small "single pedal mode" attract the continued attention of the ministry of industry and information technology? from "complete ban" to gradual relaxation, what changes have car companies made in their philosophy on the "single pedal model"?

will the return of "single pedal mode" make car driving more humane?

when it comes to "single pedal mode", many consumers may think of tesla immediately. in fact, tesla is not the inventor of "one-pedal mode" but bmw. the first-generation bmw i3 was equipped with "one-pedal mode", and products such as nissan leaf and chevrolet bolt launched at the same time all provided similar function.

however, tesla has been caught in the vortex of public opinion about "braking failure" many times, and tesla's own high popularity has caused many users to discuss the "single pedal mode". recently, a multi-vehicle collision at zhuzhou qiaotou has caused heated discussions. although the official cause of the accident has not been announced yet, because the vehicle involved in the accident was a pure electric vehicle, "single pedal mode" has once again become a keyword discussed by netizens.

in fact, whether it is "single pedal mode" or "kinetic energy recovery", this tram regenerative braking system actually has certain advantages. in addition to increasing the pure electric cruising range, it can also use the characteristics of the motor to replace traditional braking methods. it can extend the service life of brake pads and brake discs, and by recovering kinetic energy to stop the vehicle, it can also alleviate the nodding phenomenon that may occur when traditional brakes are stopped.

however, consumers who oppose the "single pedal mode" also have their own opinions. there are two main reasons. first, in the "single pedal mode", pedal control is very difficult, and rear passengers are more likely to get motion sickness. second, the "single pedal mode" is contrary to the traditional "step on the accelerator diagonally, press on the brake forward" operation method. in an emergency, in this case, there may be a possibility of accidentally pressing the pedal. if the industry allows the existence of "single pedal mode", drivers may not be able to establish a unified operating memory, which is not conducive to driving safety.

many car owners who claim that they did not press the accelerator as a brake may actually be accustomed to the "single pedal mode" and did not press the brake pedal at the first time, resulting in "brake failure" in the end.

therefore, this adjustment to the new standard seems very humane.

on the one hand, there is no prohibition on "single pedal mode" to meet the driving needs of some consumers; on the other hand, manufacturers are prohibited from setting "single pedal mode" as the default mode, and every time it is started, it enters the default setting or the mode set by the user. this is a "warm reminder" to the driver. once the possibility of "brake failure" is ruled out in a traffic accident, the driver will be the main person responsible for the accident.

of course, designs such as steering wheel buttons and turn signals that are different from the driving intuition of current traditional models have hidden dangers to driving safety. xiaotong believes that these designs can also refer to the new standards and give drivers more freedom, but the default designs and accessories are consistent with traditional models, so that users’ individual needs can be met and manufacturers can avoid more controversy.

times have changed and "single pedal mode" is no longer a good selling point

in the initial era of domestic new energy, product endurance and charging systems were limited. in order to increase the endurance of pure electric vehicles, car companies launched the "single pedal mode", but at the expense of driving comfort. with the rapid development of the industry, the cruising range of pure electric vehicles has increased to a level that at least will not cause range anxiety for urban users, and with the efforts of tesla, nio and other car companies, the charging system has gradually been improved. , even driving a pure electric vehicle to some well-known scenic spots without worrying about battery life.

under such a premise, "single pedal mode" no longer becomes the highlight of technology promotion by car companies, and the "comfort braking" function gradually becomes the new favorite of car companies. models of zhiji automobile, xpeng motors and other brands are equipped with similar functions. .

as the name suggests, the "comfort braking" function adjusts the application of braking force to reduce the nodding phenomenon of the vehicle during braking, thereby improving the comfort during braking. however, from a technical perspective, comfort braking mode will have a certain impact on the vehicle's battery life. energy recovery will convert part of the kinetic energy from kinetic energy to improve endurance. in the comfort braking mode, the vehicle will reduce the intensity of energy recovery or delay the intervention of energy and recovery to ensure a smoother braking experience, but in contrast, the energy recovery efficiency decreases.

from "single pedal mode" to "comfortable braking", it is not difficult to see the change in the attitude of car companies in terms of battery life - from the past pure pursuit of battery life to a gradual transformation towards taking into account driving comfort. furthermore, battery life and comfort are both indispensable for car owners. with the development of pure electric vehicles, car companies have found new ways to make up for the decline in battery life caused by comfortable braking, such as optimizing batteries and energy. management system, lighter body design, battery thermal management system, etc.

the "single pedal mode" is retained in the new standard, which means that the "single pedal mode" will not disappear from the stage of history in the short term. however, judging from the provisions of the new standards, the "single pedal mode" will only become a "personalized option" for the driver, but to truly avoid the phenomenon of "brake failure" caused by driving habits, drivers need to be aware , "single pedal mode" is just a "first aid method" for car owners when the vehicle's battery life is extremely low.

of course, this regulation is still in a state of soliciting opinions and has not yet been fully implemented, but xiaotong believes that only when the "single pedal mode" is no longer the driver's first choice for daily driving, can the relevant debates truly come to an end.