1 drive form
The so-called drive mode refers to the form of arrangement of the engine and the number of drive wheels, position. Usually vehicles have front and rear two rows of wheels, wherein the rotatable driven directly by the engine, so as to promote (or pulls) the drive wheel is advancing wheels of the car. The most basic classification is in accordance with the number of drive wheels, it can be divided into two-wheel drive and four-wheel drive two categories.
two drive
two drive
in the form of two-wheel drive, the position of the engine according to the position of the vehicle and the drive wheels are subdivided into rear-drive (FR), pre-precursor (FF), the rear drive (RR), rear center drive (MR) and the like. Currently, two-drive sport utility vehicle and sedan is the most common form of front-engine, rear-wheel-drive layout.
of FF (FF):
The so-called front engine front drive, front engine means, front wheel drive driving form. This is true only after the 1970s and the rise in technology to improve the driving form, present in most small cars have adopted this form of drive. Which made the transmission and the drive axle is integrally fixed to the engine next to the power delivered directly to the front wheel drive vehicle forward, with the image of the words, it is ldquo; pull rdquo; the vehicle forward.
rear-drive (FR):
The so-called rear-drive, front engine means, the form of a driving rear wheel drive. This is a traditional form of driving, Guangzhou people are familiar with the Guangzhou Peugeot sedan, the latter is typical of rear-drive cars. With this form of drive sedan, which is responsible for the task of steering the front wheel, rear-wheel drive undertake the work. Engine output power delivered to the driver through the clutch, transmission, drive shaft bridge, so that the rear wheel drive car forward, with the image of the words, is ldquo; pushing rdquo; the vehicle forward. Front-engine, rear-wheel-drive layout vehicle prone to oversteer when corneringHappening.
rear center drive (MR):
placed in front of the engine, between the rear axle, while the rear-wheel drive, a similar arrangement f1 racing. Another ldquo; after the front-engine front axle rdquo ;, i.e., the engine is placed, before the occupant, like fr, but as the mr can be attained over the axle load distribution, thus improving handling. Mr advantage is that: even axle load distribution, handling characteristics having a very neutral. The disadvantage is: the engine takes up space in the cockpit, reducing space utilization and practicality, so mr big is the pursuit of sports car handling performance.
After the rear drive (RR):
Early widely used in micro-car, multi-application now on the bus, the car has been rarely used, but Porsche 911 ldquo; flick rdquo; it is famous due to rr. Rr advantages are: compact, no heavy shaft, no complicated drive mechanism and a steering wheel. Disadvantages are: larger rear axle bearing, and ff will have the opposite tendency to oversteer in terms of handling.
four-wheel drive (4WD)
No matter which of the above layout, all-wheel drive can be used up before the off-road vehicle applications, but with the limit slip differential technology development and application of four-wheel drive system has been precisely formulated torque distribution between the wheels, the GT improve handling considerations for increasing use four-wheel drive. 4wd advantages are: maximum power has four wheels, the adhesion rate of the ground, and by a good dynamic.
The so-called four-wheel drive, there is an automobile front and rear wheel driving force, according to the state of the road surface with the engine output torque in different proportions distributed on all the front and rear wheels, in order to improve the car’s driving ability. General use 4X4 or 4WD be said that if you see a car marked with the above words, it means that the vehicle has four-wheel drive capabilities. In the past, four-wheel drive sport utility vehicle but unique, in recent years, a number of high-end luxury sedans and sports cars gradually acquired this configuration.
have four-wheel drive following classification:
four-wheel drive (Part-time 4WD)
This is a driver can manually select between two-wheel drive and four-wheel drive system, according to road conditions by the driver, by turning on or off to change two splitter wheel drive or four-wheel drive model, the most common of which is the general four-wheel drive sport utility vehicle or SUV driving mode. The most significant advantage is that the driving mode can be selected according to the actual situation, more economical. Used on the highway wheel-drive gear; snow road conditions encountered when selecting four-wheel drive, to enhance the adhesion and handling of the vehicle:
AWD (Full-time 4WD)
the drive system is not required to select the driver operation, front and rear wheels will always maintain four wheel drive mode, the engine output torque when driving by front and rear wheels is set at 50:50 on the front and rear wheels to maintain the same amount of torque. Full-time drive system has a good driving handling and tracking of travel, with full-time four-wheel drive system, you can successfully driving on paved roads covered. But its disadvantages are also obvious, and that is a comparison of oil, the economy is not good enough. Moreover, there is no device to control the vehicle tire speed difference, once a tire off the ground, tend to make you stuck in there, we can not move forward. However, this year also developed some intelligent all-wheel-drive system, such as Audi’s quattro, the face of special road, he can redistribute torque, more torque on the allocation without slipping wheel, thus solving the old AWD drawbacks.
timely drive (Real-time 4WD)
using timely drive system of the vehicle may be controlled to select for the current situation by the computer driving mode . In normal road, rear-wheel drive vehicles generally the way. Once the wheel slip or poor road surface conditions encountered, the computer automatically detects the engine output torque is immediately assigned to the two front wheels and four-wheel drive is switched to the natural state, eliminating the driver’s judgment and manual operation, application easier. However, compared with the computer brain, slow reaction after all, and in so doing, also they lack the sense of conquest that everything is under control and driving pleasure.
face in the vaporCar market in all kinds of vehicles, shop around, do not forget to carefully consider their actual needs. While bargaining, carefully look at the performance of the drive system and off-road vehicles, to choose the right way to drive the car of your choice is more suitable for your needs.