Full time 4WD What is the difference between time sharing 4WD and real time 4WD?

The same four-wheel drive system, timely, time-sharing, full-time is so different?

1. Time-sharing four-wheel drive.

The gear settings are: 2H (2WD high-speed), N (Neutral H (4WD high-speed L (4WD low-speed).

The time-sharing four-wheel drive must be adjusted manually.

The biggest problem of time-sharing four-wheel drive, there is no ** differential, 4H, 4L state does not steer on a good road, and the use of turning on a bad road is basically thrown over.

2. Timely four-wheel drive.

Generally, there is no gear, and no manual adjustment is required. Generally, it is only equivalent to a front-wheel drive car, and only when the "front axle" slips for more than 1 second will power be transmitted to the rear wheels.

But there are exceptions, such as the Nissan series, will equipment, 2h, 4h, 4h

lock (equivalent to the four-wheel drive high-speed of time-sharing four-wheel drive), which can be manually adjusted as needed. But relative time-sharing four-wheel drive, poor strength, 4h can walk on a good road and turn casually, there is a little full-time four-wheel drive meaning, but the response is far less than full-time four-wheel drive. 4h

Lock, which will automatically unlock to a 4h state after more than 40km h, to avoid steering rollover, side slippage or damage to the drive system.

The biggest problem with the timing 4WD is that the differential is slow or unable to lock completely.

3. Full-time four-wheel drive.

This is always a four-wheel drive state, which is generally the case for luxury cars, full-time four-wheel drive is more fuel-intensive, but the vehicle has good stability and good braking performance.

The three differ only in the way they are driven, and there is no other difference.

Full-time four-wheel drive is the four wheels have been driven independently, the four wheels have power distribution at any time, when a wheel slips, the system will automatically intervene, redistribute the power of the four wheels, to ensure that the four wheels get the highest grip at all times.

Four-wheel drive is a four-wheel drive system that allows the driver to manually select two-wheel drive or four-wheel drive, and the driver can change the drive mode of two-wheel or four-wheel drive by turning the transfer case on or off depending on the road conditions.

Just-in-time 4WD refers to a 4WD system that is activated only when the time is right, while in other cases it is still a two-wheel drive system.

Extended information: The vehicle with all-wheel drive has the following advantages:

1. Because all-wheeled vehicles can use the full weight of the car as the adhesion pressure, the adhesion is significantly increased, that is, the traction limit is extended.

2. The power of the engine can be transmitted to each wheel respectively, that is, the driving force burden of each driving wheel is reduced, so as to ensure that enough power is transmitted to the road surface without exceeding the tire friction limit (no wheel slippage), so that the car has strong off-road ability.

3. The wear and tear of the tire is uniform, which is conducive to prolonging the service life of the tire.

At the same time, the all-wheel drive type has the following drawbacks:

1. The transmission system is long, the structure is complex, the manufacturing cost is high, and the maintenance is difficult.

2. The noise is high, the vehicle is heavy, and the driving force transmission efficiency is low and the fuel consumption is large, that is, the fuel economy is not good.

The difference between full-time four-wheel drive and time-sharing four-wheel drive is: different drive schemes, different opening operations, and different transformation forms.

First, the drive scheme is different.

1. Full-time four-wheel drive: it cannot be turned off, and it is always in four-wheel drive mode.

2. Time-sharing four-wheel drive: You can control the four-wheel drive mode to turn on and off.

Second, the opening operation is different.

1. Full-time four-wheel drive: no operation required.

2. Time-sharing four-wheel drive: There is a special switch to switch between 2-wheel drive mode and four-wheel drive mode.

Third, the transformation form is different.

1. Full-time four-wheel drive: the driving force of four-wheel drive is realized by three differentials.

2. Time-sharing four-wheel drive: the driver artificially selects the driving force according to the road conditions.

What is the difference between timely four-wheel drive, time-sharing four-wheel drive, and full-time four-wheel drive, and which one is better?

Part-time four-wheel drive and full-time four-wheel drive is that the vehicle is not in the four-wheel drive state for a long time, under normal operation conditions, the use of two-wheel drive, when the need to go through the bad road, the driver can switch the two-wheel drive to four-wheel drive through the transfer lever in the cockpit, so that the four wheels provide driving force, so as to improve the passing performance of the vehicle. It has the advantage of being simple in structure. But the shortcomings are also very obvious, one is that the owner must operate manually, and some with free wheels also need to get off the car to operate, so that not only the operation is very troublesome, but also can not respond quickly when encountering bad road conditions, and often misses the best time to get out of trouble; Second, because the time-sharing four-wheel drive does not have a first-class differential, the four-wheel drive system cannot be used on hard ground (paved road), especially in the corner, which can not turn smoothly, causing great hidden dangers to driving safety.

Full-time four-wheel drive is a four-wheel drive system that keeps the four wheels of the car driven. Because it has the best differential, it avoids the drawbacks that the time-sharing four-wheel drive system can not be used on hard ground, and because the four wheels of the vehicle have driving force at any time, even if it encounters bad road conditions, it does not need the driver to get involved, and it can work directly, and the four-wheel drive is more reliable than the score. Part Time 4WD:

This is a four-wheel drive system that the driver can manually choose between two-wheel drive and four-wheel drive, and the driver changes the two-wheel drive or four-wheel drive mode by turning the transfer on or off according to the road conditions, which is also the most common drive mode for off-road vehicles or four-wheel drive SUVs.

The difference between full-time four-wheel drive, time-sharing four-wheel drive, and timely four-wheel drive is: different conversion timings, different modes, and different economies.

First, the timing of the conversion is different.

1. Full-time four-wheel drive: Full-time four-wheel drive cannot be converted to drive mode.

2. Time-sharing four-wheel drive: Time-sharing four-wheel drive can be changed by the driver according to the road conditions, by turning on or off the transfer case to change two-wheel drive or four-wheel drive.

3. Timely four-wheel drive: Timely four-wheel drive will only be converted to four-wheel drive when appropriate.

Second, the mode is different.

1. Full-time four-wheel drive: Full-time four-wheel drive vehicles only have one independent mode of four wheels.

2. Time-sharing four-wheel drive: Time-sharing four-wheel drive has two-wheel drive or four-wheel drive mode.

3. Timely four-wheel drive: Timely four-wheel drive has two-wheel drive or four-wheel drive mode.

Third, the economy is different.

1. Full-time four-wheel drive: Full-time four-wheel drive has good off-road and handling performance, but it cannot make adjustments to torque distribution according to road conditions, and the fuel consumption is large and the economy is poor.

2. Time-sharing four-wheel drive: Time-sharing four-wheel drive can ensure the power and passability of the vehicle, and can also take into account fuel economy.

3. Timely four-wheel drive: Timely four-wheel drive can not only effectively reduce costs, but also help reduce the weight of the whole vehicle, greatly reduce fuel consumption and improve economy.

Analysis of four-wheel drive characteristics (next episode).

There are three driving modes of four-wheel drive, namely time-sharing four-wheel drive, timely four-wheel drive, and full-time four-wheel drive.

Full-time four-wheel drive: simply put, the vehicle is a four-wheel independent drive device at any time, "all wheel drive" abbreviation "AWD" is its English abbreviation, full-time four-wheel drive car has a flexible connection of the ** differential, the front axle and the rear axle have independent differentials, through these two differentials to distribute the driving force to the four tires. There are two types of differentials, the first one:

Coupling; The second type: multi-clutch type, characterized by a fixed torque output distributed to the front and rear wheels, its handling and off-road ability are good, but the disadvantage is that fuel consumption is high. And its squeezing of space and the cost is also very high, usually, full-time four-wheel drive is used in more expensive SUVs, or hard-core off-road vehicles.

For example, the Lexus GX, Land Patrol and Mercedes-Benz Big G.

Timely four-wheel drive: it automatically distributes power to the rear wheels through the hydraulic coupler, compared with full-time four-wheel drive, the structure of timely four-wheel drive is simpler, usually, it only needs to use the computer to control the switch of four-wheel drive or two-wheel drive, to a certain extent, to achieve the effect of fuel saving, but there is a disadvantage of timely four-wheel drive, that is, it can not provide more than 50 percent of the power to the rear wheels, so it is not as good as full-time four-wheel drive in the ability to get out of trouble. Compared with models equipped with full-time four-wheel drive, it is generally not too expensive to use models with timely four-wheel drive**, such as CR-V.

Today, in fact, the four-wheel drive mode of many models has become blurred with the advancement of technology, and consumers do not need to pay too much attention to the problem of four-wheel drive, after all, if they are not off-road enthusiasts, they may be used very little.

1. The application models are different.

Full-time four-wheel drive is mostly used in luxury brands, such as Audi Q7, BMW X5 and Mercedes-Benz GLS, etc., and these luxury brands have their own names, Audi is called Quattro, BMW is called Xdrive, Mercedes-Benz is called 4matic, Acura is called SH-AWD, etc.

Time-sharing four-wheel drive is mostly used in hard-core off-road vehicles, such as models such as Mitsubishi Pajero, Nissan Tuda and Beijing BJ80.

Timely four-wheel drive is mostly used in urban SUVs, such as Honda CR-V, Nissan X-Trail and Hyundai Tucson. <>

2. The structure is different.

The structure of full-time four-wheel drive is more complex, the cost is higher, and the fuel consumption is relatively high.

The structure of time-sharing four-wheel drive is simple, stable and reliable, the off-road ability is extremely strong, and the 2H mode is relatively fuel-efficient.

The structure of the four-wheel drive is simple, the cost is low, and the weight is light (fuel-saving). <

3. The operation is different.

Full-time four-wheel drive is a four-wheel independent movement at any time on any road, simple to operate, always turn on four-wheel drive mode, and equipped with full-time four-wheel drive SUV steering is very moderate, it does not have the problem of understeer like front-wheel drive cars, nor does it have the problem of oversteer like rear-wheel drive cars.

Time-sharing four-wheel drive realizes the switch between two-wheel drive and four-wheel drive through the transfer case, which is manually controlled by the driver, and the operation is very complicated, and even the operation has to be stopped, and it is possible to miss the best time to get out of trouble.

Timely four-wheel drive through the computer to sense the road conditions in the appropriate case it will use four-wheel drive, generally mainly two-wheel drive, and do not need the driver to switch manually, but the physical structure limit is low, the ability to get out of trouble is poor. <>

Time-sharing four-wheel drive, through manual control of the drive, cheap power, easy to wear, drive power distribution evenly However, this technology is too old, the fuel consumption is large, the timely four-wheel drive electronic control drive, four-wheel drive ability, full-time four-wheel drive, always maintain the intelligent four-wheel drive state.

The full-time all-wheel drive car has a softly connected ** differential, and the front and rear axles also have separate differentials, through which the driving force is distributed to the four tires.

The structure of the four-wheel drive is simpler at the right time, and under normal circumstances, it only needs to use the computer to control the switching of the four-wheel drive or two-wheel drive, to a certain extent, to achieve the effect of fuel saving.

The difference is that the form of the drive is different.

By the way, it may be the balance when driving, and the difference in its power.

I think the main thing is that there is a difference in the powertrain.

What is the difference between timely four-wheel drive, time-sharing four-wheel drive, and full-time four-wheel drive? Which is better?

The difference is that each of them has different motivations.

The main thing is that the power system is not the same. And cause these.

The drive and power will vary.

The main thing is that there are some differences in the powertrain.

To a certain extent, the effect of fuel saving is achieved, and the power system is enhanced.

Full-time four-wheel drive means that the vehicle has been maintained in the form of four-wheel drive throughout the driving process, and the engine output torque is distributed to the front and rear wheels in a fixed proportion, which can have better off-road and handling performance at any time, but can not make adjustments to torque distribution according to road conditions, and fuel consumption is higher.

In normal road surface, the vehicle is driven in two-wheel drive mode, and when encountering off-road roads or wheel slippage, the computer will detect and automatically distribute the power to the other two wheels. For the real-time four-wheel drive mode, the quality of the control program will affect the intelligence of the drive mode switching.

In addition, there is also a part-time 4WD that is manually controlled by the driver to switch the drive form. Nowadays, many SUVs and off-road vehicles have one or more of the above four-wheel drive modes at the same time to complement each other's short and long.

The so-called time-sharing four-wheel drive refers to a four-wheel drive system that the driver can manually choose between two-wheel drive and four-wheel drive. In operation, the driver can choose to turn on or off the transfer case according to the specific road surface and driving conditions to change the two-wheel drive or four-wheel drive mode, 4S in the vehicle sales, but also tend to "four-wheel drive" as a selling point for sale, many friends do not understand the "four-wheel drive" type, they are confused to pay for the bill, and then often say that their car is "four-wheel drive" can easily off-road, the first four-wheel drive system because there is no transfer case so it does not have the engine torque amplification function, That is to say, what is the peak torque of the engine, and the maximum can only play so much; And the main role of this type of four-wheel drive is to improve the stability of road driving, and the clutch structure is a limited-slip differential.

In addition to the changes in the exterior and interior, the most important change is to change the full-time four-wheel drive to time-sharing four-wheel drive. This has attracted a large number of netizens to complain and abuse, the regression of the times, Toyota's differential treatment of Chinese, reduction and a series of irrational remarks. Generally, economy car brands, such as Toyota, Honda, and Volkswagen, will use a timely four-wheel drive system for their SUV models; Luxury brands, such as Mercedes-Benz, BMW, and Audi, have full-time all-wheel drive systems for some of their SUVs.

The principle of time-sharing four-wheel drive is that the output power of the engine is transmitted to the front and rear axles through the transfer case, and the switching of two-wheel drive, high-speed four-wheel drive and low-speed four-wheel drive is realized through the transfer case. Most timeshare 4WD transfer cases are not equipped. The time-sharing four zones are manually controlled by the driver, it is through the transfer case to complete the switch between the two zones and the four zones, its stability is good and very durable, the structure is simple, it is the manual operation of the four zones and the switch of the two zones, the driving in the two zones is more fuel-efficient, the off-road performance is extremely strong in the four zones, and the vehicles are four wheels independent pushing device.

AWD) full-time four-wheel drive is based on the principle of distributing the power provided by the engine to the four wheels through the flexible connection of the ** differential, and the independent differential on the front and rear axles. to drive the vehicle forward or backward.