Regarding the configuration of the car, there are actually some configurations that seem to be useful, but are actually very bad.
It's like saying: some restaurants look clean and palatial, but in fact, the kitchen is dirty and dirty, and you will have diarrhea immediately after eating happily.
Welcome pedals
What is the first such configuration called? "Welcome pedal". A lot of people still spend money on retrofitting, right?
Hu Minzhe of Hunan University has a paper, "SUV Ergonomics Research", which mentioned above: The factors affecting the convenience of occupants getting on and off mainly include the inclination of the door column, the width of the access and disembarkation channel, and the inclination of the sidewall of the body.
The impact of the chassis height is not so obvious, unless the chassis is very high, one step can not be stepped on, please refer to the big truck.
In fact, many urban SUVs are developed on the same platform as cars, and the chassis is not much higher than that of cars.
Take more than 100,000 home-class SUVs for example, and the minimum ground clearance of many models is less than 200mm.
For example: Honda CR-V, Toyota Rongfang, etc., and the gap between the car is mostly about a few centimeters, and it is not exaggerated enough to need a pedal to get on the car more conveniently.
And some cars actually did not design this part with heart, and the manufacturers purely regarded the pedals as accessories to enhance the visual effect of the appearance over there, which is good-looking.
For example, a certain model also mentioned in the paper just now, after actual calculations, it is equipped with pedals, and the utilization rate when getting off is less than 0.6%, and 1% is less than 1%.
Skip the pedal without stepping, directly get on and off the car, all this way, but it is possible to dirty the pants legs, which can be said to be a very chicken rib.
External spare tire
The second one to talk about is the external spare tire. Some urban SUVs like to use this to set off the "off-road temperament".
In some cases, the external spare tire does have certain advantages.
Wang Zhang et al. published a paper in the journal "Vehicle and Power Technology", "Vibration Fatigue Analysis and Test Verification of External Spare Tire Bracket", which has been mentioned above.
The external spare tire can increase the departure angle of the vehicle, improve the passability, free up the chassis space to install the auxiliary fuel tank, improve the mileage, and ensure that the spare tire can be easily taken out when trapped.
However, these advantages are almost not used on these paved roads in the city. The paper also said that the plug-in spare tire has many side effects.
First of all, the total weight of the aluminum alloy wheels and tires of the spare tire is basically more than 25kg, which is almost equivalent to the weight of a large air trunk filled.
This will greatly increase the load of the tailgate system, in the daily opening, the tailgate system for a long time to withstand the alternating load caused by the external spare tire, will bring a lot of impact to the door hinge and spare tire bracket.
Over time, it is possible to produce a "creaking" noise, difficulty in opening and closing the rear tailgate, and so on, and if the installation position is not good, it will also block the line of sight of the rear window.
Pure virtual keys
The third configuration to say is the pure virtual button design of the center console, intelligent and advanced, right?
The big screen enhances the sense of technological atmosphere of the vehicle interior, looks good, the car is easy to sell, and it seems to have a lot of functions, right? Now more and more cars are car central control looks like a large-screen mobile phone, right?
However, all the physical buttons have been eliminated, and the use of pure virtual buttons still has a little more gimmick than the actual use.
Jiang Xiaopu et al. published a paper in the journal Packaging Engineering, "Research on Safety Principles in Automotive Center Console Design".
As mentioned above: In the design of the car, the principles of ease of use, visibility and reasonable feedback should be followed to reduce the cognitive load of the driver.
Pure virtual buttons in this regard to do the same as the physical buttons, it takes a lot of effort.
And some manufacturers do not do very well in this regard, but put some commonly used functions below the secondary menu of the UI interface, making simple things complicated.
Once the virtual button or UI interface is not done, the driver will be distracted to operate the screen, it is possible to blindly operate this kind of thing.
Now it has become a car while playing with mobile phones, air conditioning here, temperature, temperature, do not get ahead of the crash, then there is danger.
Mazda once conducted a study that turned out to be that drivers inadvertently apply torque to the steering wheel when they touch the touchscreen interface in any vehicle.
As far as you look to the right, when you press, the steering wheel of the car may be deflected to the right, which will cause the vehicle to deviate from the lane, which will increase the risk of accidents, I do not recommend you to try it, they investigate that this is it.
Pedestrian protection hood
The fourth configuration to be said is the pedestrian protection hood.
This configuration is meant to protect pedestrians, and it can reduce damage when hitting, right? The head or something has a clear protective effect.
But in fact, the car with this configuration on the market now does not perform as well as we think.
Liu Tingzhi of South China University of Technology has a paper, "Research and Development of Bouncing Hood Based on Pedestrian Protection".
Above: This device requires the hood to be lifted to a height within 50ms of the accident, so a large energy source is required.
What are the more common ones at the moment? Spring type, pyrotechnic type, electric motor type and so on. However, these forms of ejection systems can cause damage to the hood to a greater or lesser extent.
For example, the spring type and part of the pyrotechnic type will destroy the hinge of the hood, and some pyrotechnic type, each time triggered, the complex structure of the gas generator will be replaced.
To put it simply: the disposable chopsticks "snap" open, people know that the chopsticks have been used, to make a new one, almost this meaning.
That will lead to very expensive maintenance costs, some cars after the hood pops out, the maintenance cost of the 4S shop is as high as tens of thousands of yuan.
Tens of thousands of yuan don't care about it, human life can be retained, the money anyway, the insurance company can help us bear it, right? After all, it is a matter of goodwill.
But the problem is that this system also has a failure rate, and everything has a failure rate, which is easier to trigger by mistake.
Sometimes it's possible to bump into something on the road or a slight rear-end, or the toll collector is slapping at your hood: "Pay the parking fee!" ”
If it is not good, the "bang" will directly pop out, which is very pitted, but there is no danger to produce danger, and further optimization is needed.
Some configurations seem useful but are actually not easy to use
So, in general, some of the configurations on the car seem to be very useful, in fact, it may not be said that it is useless, and the counter-effect may be there, and there are still many such things.
That kind of similar configuration, friends have not encountered the one that has not been mentioned, may wish to discuss and discuss it together in the comment area.
5 must-have configurations for novice drivers to buy a car
Just talked about is not very recommended configuration, so novice friends to buy a car, which 5 configurations are almost mandatory? After buying the beggar's version of the car, what are the 4 most worth adding?
The 5 most chicken ribs on the car, what is the tasteless food and the pity of abandonment? How do we identify it in our own car?
For everyone to sort out a lot of information and list, a full 8 dry goods, want to see is very simple.
Keyword: configuration
Pay attention to the WeChat public account "spare tire car", reply to the keyword "configuration" can be.
I this public number, every day will give you a piece of car practical small dry goods, text version, audio version, video version have, pick your favorite version on it, "spare tire said car" waiting for you to play Oh.
bibliography
Hu Minzhe. Research on ergonomics of SUV[D].Hunan University,2012.
Wang Zhang,Wang Lei,Nie Chunhong,Ma Zhongmin,Wan Zhen,Xiao Jieping. Vibration fatigue analysis and test verification of external spare tire bracket[J].Vehicle and Power Technology, 2020.
Jiang Xiaopu,Xingxiang,Hu Shuke. Research on safety principles in automobile center console design[J].Packaging Engineering, 2020.
LIU Tingzhi. Research and development of bouncing hood based on pedestrian protection[D].South China University of Technology,2012.