Friends who often understand car knowledge should have heard this sentence, "Throttle hard, the rest to the quattro", but the Mitsubishi super four-wheel drive system and Acura SH-AWD four-wheel drive system is very unconvinced, these four-wheel drive systems are indeed excellent, but how many of the cars running on the street are real four-wheel drive? The cars we most often come into contact with are front-drive and rear-drive, for example, Wuling Hongguang MINIEV is a rear-drive car, so who has the advantage of front-drive and rear-drive on the ice and snow ramp? Uncle Che will analyze and analyze with you today.
Usually we think that the rear-drive car has an advantage in straight-line acceleration and handling, and it is true, otherwise Cadillac would not have caused such a big sensation when it launched the CT4, after all, this is the cheapest rear-drive car in the same class, so is the rear-drive car reliable when climbing on the ice and snow road? If there is a physicist reading this article at this time, then please take out a paper and pen, draw a force analysis map, and the scum can look at the painting of the bully.
When climbing uphill, the tire most needs is grip, which can be regarded as static friction between the tire and the road surface, and increasing the pressure can also increase the friction, as long as you understand this truth, all the problems will be solved. Whether it is a front-drive or a rear-drive vehicle, in the case of the front-facing layout of the engine, the load on the front axle is greater than that of the rear axle, and if the tire performance is the same, it means that the front-drive car will have a stronger grip, and climbing is naturally easier than the rear-drive car.
The so-called maneuverability of the rear-drive car is not good on the ice and snow road, when the rear wheel is crazy on the snow, the vehicle is very prone to the phenomenon of "pendulum", the front-drive car even if the skid will not be too large, the body is basically in a relatively stable state, so as a family car is a better choice. It should be noted that when driving up the ice and snow ramp, remember to turn off the ESP, this function was originally to help the driver stabilize the body, but in the event of skidding, esp will reduce the engine torque, or even directly cut off the power, resulting in insufficient power for the car to climb the slope, which is more dangerous.
It is not impossible for front-facing rear-drive models to climb the ice and snow ramp smoothly, mainly because of the counterweight, when the vehicle is fully loaded, there is more pressure on the rear axle of the rear-drive car, and the tires can be better attached to the ground, perhaps this is the meaning of turning pressure into power, and this is why vans generally use rear-wheel drive. Also climbing under full load, the front drive will be subjected to more gravity and force parallel to the ramp and downhill, at which point the front wheels will have insufficient grip and the vehicle will be difficult to climb uphill. So if you drive a rear-drive car but can't climb the snow ramp, you can borrow a few people from the owner of the front-drive car who also can't climb the slope.
When the wheel slips on the ice and snow road, the wheel is definitely not in contact with the road surface, and the snow chain is needed to assist, just like a cat needs to extend its claws when walking on the ice. We who have been in junior high school know that increasing the roughness of the contact surface can increase the friction, and the smaller the contact area, the greater the pressure, and these two physical knowledge is the working principle of the snow chain. At present, there are four kinds of snow chains that can be bought on the market, namely iron chains, beef tendon chains, rubber chains, wire rope snow chains, which also correspond to different working conditions, and there is a big difference in price, consumers must choose the right snow chain when purchasing, if the snow is not very thick, the use of iron chains will cause serious damage to the tires.
Uncle Che summed up
In recent years, more and more private cars have met everyone's travel needs, but the increasingly complex traffic situation has become a new problem, and how to ensure safe travel has become a hot topic for car owners. Today, Uncle Che and everyone jointly studied the advantages and disadvantages of front-drive and rear-drive vehicles on ice and snow ramps, if you encounter such a situation during the Spring Festival holiday, you can practice it. In addition, in this case, remember to keep the distance, even if your car can come and go freely on the ice and snow road, other owners may not have a car.