With the tightening of emission policies, electric vehicles have gradually become the first choice of many car owners.
However, many car owners only found out that pure electric vehicle has more abundant active and passive safety configuration and auxiliary control configuration than fuel vehicles, such as driving modes (ECO, NORMAL, SPORT...), Recovery mode (strong recovery, weak recovery...) and even pedal operation mode (single pedal, dual pedal), etc. How should the friends who have been driving fuel vehicles for a long time choose and operate?
Before buying a car, Xiao Deaf asked Tai Ge what is single pedal control, so today I will give you a brief introduction to single pedal control for pure electric vehicles.
Electric vehicles are equipped with kinetic energy recovery
We all know when learning to drive that when traditional fuel vehicles are decelerating and braking, the kinetic energy of the vehicle's movement is turned into heat energy through braking, and Released into the air, and in new energy vehicles and ordinary hybrid vehicles , this kind of kinetic energy wasted by braking can be converted into electrical energy and stored in the power battery through braking energy recovery technology.
Simply put, due to the characteristics of the motor, the forward rotation can drive the vehicle forward, and the reverse rotation can be the generator energy storage. The kinetic energy wasted by the brakes of the fuel vehicle can be used by the kinetic energy recovery system 's motor reverses to generate electricity, and converts part of the energy back into electrical energy and stores it in the battery.
When driving a new energy vehicle,When the accelerator pedal is released or the brake pedal is lightly stepped on, the obvious dragging sensation appears, that is, the kinetic energy recovery system is working. It is generally believed that about one-fifth of the ability of the vehicle in ordinary braking situations where the vehicle is not emergency braking It can be recycled through the kinetic energy recovery system. Compared with traditional power vehicles, new energy vehicles carry large-capacity battery packs, so that the recovered energy has a place to go. This is why most new energy vehicles are equipped with kinetic energy recovery systems.
Single pedal operation is a driving condition that uses the kinetic energy recovery system to the extreme.
Traditional fuel vehicles use mechanical brakes to waste the kinetic energy generated by fossil fuels through braking heat. New energy vehicles and hybrid vehicles fully recover this part of wasted energy through kinetic energy recovery. Through the optimization and upgrade of the kinetic energy recovery system of the JAC models in the figure, in the case of parallel energy recovery, the contribution rate of the NEDC operating range is 10%, and the NEDC operating mode endurance under the single-pedal operation energy recovery mode The mileage contribution rate reaches the level of 15-20%, which has a very obvious effect on the improvement of the endurance of new energy vehicles.
Offline, Tai Ge has also interviewed many online car-hailing drivers. Their main way to ensure the long driving time per day is to switch from traditional fuel vehicles to driving new energy vehicles to use strong kinetic energy recovery, and to reduce and drive at least The brakes are stepped on as frequently as on fuel vehicles, which affects the recovery of kinetic energy and wastes electrical energy.
Although the single pedal is good, the probability of accidentally stepping on the accelerator becomes higher
For those who are used to electric vehicles, the single pedal mode that New Energy likes is really useful. As long as the right foot controls the throttle, the car can accelerate and decelerate. Compared with fuel vehicles, the right foot needs to move back and forth repeatedly. The strong kinetic energy recovery logic can also effectively reduce maintenance costs caused by brake wear.
But in Taige's view,The single-pedal logic is very good, but it has a very big safety hazard for the owner to avoid danger in an emergency.
The reason is very simple. Before fully realizing automatic driving, the single-pedal logic means that the misoperation rate of car owners has been high. As one of the main inputs to the vehicle control software to translate the driver's intention, like the accelerator, the brake is not a simple "sensor" with only two states of "on" and "off", but a huge 3D or nD lookup table
Releasing the throttle can be understood as the driver wants to decelerate, but the one-dimensional variable of "on" and "off", the car cannot understand how much you need Deceleration, whether to brake hard or to slow down gently. If you want to brake suddenly but accidentally release the accelerator and the speed is slower, it is understood as only moderate braking, how do you remedy this time? Should I step on the accelerator again? However, on the one hand, this is only an auxiliary brake, and in many cases the driver still needs to apply the brake.
But a car mainly asks, many manufacturers have been pushing the single pedal mode to save effort and better?
is very simple. The ultimate purpose of the single-pedal braking function is not to "brake", but to improve the energy efficiency of the car and avoid unnecessary energy loss on the friction and heat of the brake pads. Therefore, most manufacturers' positioning of the single-pedal braking function is to provide the driver with a consistent motor braking experience when the driver releases the accelerator but does not step on the brake.
In many cases, the logic of this consistency is very simple, providing relatively stable braking force under different working conditions, even regardless of the speed of the throttle.
From the perspective of the human body, when encountering danger, it is nervous and hard. To give a simple example, we get goose bumps when we are nervous,The stiffness of the limbs is the tightening action after the muscles are tense, which means that when we are in danger, we tend to step on this action instead of loosening this counter-logic.
People are very prone to "stiffness" when they are nervous
Imagine another scenario, when cruising on a high speed and about to reach the toll gate, if there is no kinetic energy recovery, the most energy-efficient driving The method is to let the car slide as much as possible, and use all the kinetic energy to overcome wind resistance and tire rolling resistance. If the strong kinetic energy recovery mode is used, it means that you have to hold the "throttle" until you are less than 100 meters away from the toll station, then you can release the "throttle" to recover the kinetic energy, and the electricity collected at this time can also be used. Let the car drive tens of meters at a constant speed.
In addition, in the single-pedal mode, the driving quality of the vehicle will be greatly reduced, because if you want to maintain a uniform deceleration state, you must precisely control the "throttle" force, otherwise When the car starts, there is a meal. In this way, it becomes the driving state of "big foot throttle to big foot brake", which is not a smart way from the perspective of comfort and efficiency.
Therefore, it is basically impossible for ordinary car owners to rely on this single pedal operation to cover all driving environments and working conditions.
With a single pedal, no one in the car will feel motion sickness
The first time the owners of new energy vehicles use kinetic energy recovery, most of them are so frustrated that the whole car wants to vomit. So what can I do to play "single pedal"? First of all, when accelerating, try to step down at a constant speed, and don't slam the foot to the end; when decelerating, try to lift the pedal at a uniform speed instead of violently.
single pedal mode,It does not mean that the brake pedal is completely useless. In an emergency, you still need to use the brake pedal for emergency braking. Especially when driving at high speed, braking in an emergency still needs to be controlled by braking.
The logic of the single-pedal mode is excellent. It makes driving easier, but it is not easy for users to change their driving habits immediately. Including that many new energy vehicles on the market now combine the idle speed creep and single pedal mode. This mode is more like a compromise, a compromise on driving habits.
For most old drivers, the relationship between the brake pedal, accelerator pedal, and manual shift lever is like growing in the body and it is difficult to change. And considering the fragmented nature of the auto market, it is difficult for a company to jump out to promote the change of this habit. Therefore, to be conservative, most new energy vehicles will simulate the driving experience of an internal combustion vehicle, and keep creeping at idle speed.
With the realization of more and more intelligent auxiliary functions, our driving will definitely become easier and smarter. From the early three pedals to two pedals, who can be sure that the single pedal mode will not become the "standard" in the future.
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