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[YesAuto Four-wheel drive detailed] Unknowingly, our “Fun Four-wheel Drive” has reached the 27th issue. If you are a friend who only pays attention to this content, and you don’t know much about four-wheel drive, you can click here (Click to view the basic knowledge of playing four-wheel drive) understand. In the previous article, we introduced the four-wheel drive types of today's SUVs and explained the classification of differentials that are closely related to four-wheel drive knowledge. Today, we bring you an introduction to the four-wheel drive model of a Japanese high-end brand SUV. It is the 2013 Lexus LX 570 (many people also like to call it LX570 for short). It currently has only one model to choose from in China. , There is no distinction between high-end models and low-end models. As Lexus' flagship SUV product, how will it perform in terms of four-wheel drive performance? Is it worthy of the title of flagship? Now, please walk into the test field with us to verify its performance.

  Model introduction:

The 2013 Lexus LX 570 was launched in February 2012 (hereafter referred to as “LX570”). It is a medium and large SUV with excellent road performance and off-road performance. Its interior style is also more luxurious. Speaking of it, I have to mention the Land Cruiser. Those who are concerned about SUV models are not unfamiliar with the Toyota Land Cruiser (the official name is Land Cruiser, but riders are even more familiar with it. Like to call it Lu Xun). The LX570 model is based on Toyota Land Cruiser and has a similar foundation, but the LX570 is relatively richer in four-wheel drive-related electronic equipment. Since we are only testing its four-wheel drive performance today, if you want to learn more about other aspects of this car, you can read the previous article: “Slightly upgraded big guys experience the new Lexus LX570” to understand.


Four-wheel drive structure:

From a structural point of view, a Torson torque-sensing self-locking differential is equipped between the front and rear wheels. The central differential can distribute the torque output by the engine according to the ratio of 40:60 to the front and rear wheels, which is biased towards the power of the rear drive. The distribution method makes daily driving relatively improved handling. The front and rear axles are also equipped with a jaw-type differential lock. In extreme situations, the driver can turn on the central differential lock for off-road relief. At this time, the front and rear wheels will receive a 50:50 torque distribution. Equipped with an open differential between the two front wheels, the same is true for the rear wheels. Of course, as a flagship product, the ability to get out of trouble does not stop there. Like other “professional” off-road vehicles, the LX570 is also equipped with a low-speed torque amplification function. Under low-speed four-wheel drive, the vehicle's torque will be amplified by 2.6 times.


Four-wheel drive performance:

Next, let's take a look at the performance of the four-wheel drive system of this flagship SUV of Lexus. Please follow us into the test field.

Lexus LX 2013 Model 570

Model Homepage| Parameters Configuration| Picture| Word of Mouth| Model Quotation
Manufacturer's guide price

1.74 million

Power distribution test of front and rear axles:

In the power distribution test between the front and rear axles, we let the two front wheels and two rear wheels of the vehicle lose their grip, respectively, and test to see if the vehicle can get out of trouble with the other two wheels with adhesion. The LX570's four-wheel drive system can be said to be very easy when facing this situation. The two wheels without grip almost have no idling. The power output by the engine is quickly distributed to the wheels with adhesion. In addition, the LX570 engine has The higher torque output makes it easy to get out of the car, and the whole process is very smooth.

Cross axis test:

This test mainly tests the limited slip capability between the two wheels of the vehicle. Since the front and rear axles of the LX570 use open differentials, the limited slip between the two wheels must rely on the electronic auxiliary braking system of the body to apply braking force to the slipping wheels, so that the wheels with adhesion on the other side can obtain sufficient torque. . Judging from the actual performance, its wheels will slip to a certain extent, but soon the electronic system began to intervene to intervene, and the wheels that were idling without adhesion were given sufficient braking force, and finally the LX570 could easily get out of trouble with two wheels.

Single-round landing test:

The first two tests are easily passed, and finally try the hardest project. We will let the front wheel and the rear wheel of the LX570 have adhesion, and the other three wheels will lose their grip on the pulley block. When only one wheel has adhesion, it is no longer so easy to get out of trouble. During the test, the three wheels without adhesion showed a certain degree of slippage, but the powerful electronic assistance system of the LX570 itself is very fast. Just step in and apply effective braking force to the slippery wheels. At this time, you only need to slowly step on and hold the accelerator while holding the steering wheel. In the end, the LX570 is still not stumped, relying only on an adherent wheel. Successfully escaped.

After actual measurement, we can draw the following conclusions for this four-wheel drive system:

Advantages: General off-road relief is relatively easy for Lexus LX. The electronic assist system has an obvious limited-slip braking effect on the wheels and responds quickly. The powerful torque output by the engine can be quickly distributed to the wheels with adhesion to help the vehicle get out of trouble.

Disadvantages: Although the Lexus LX is equipped with a powerful electronic auxiliary system, whether the reliability can be as reliable as the traditional mechanical differential lock is indeed a bit worrying.

to sum up:

In general, as a flagship SUV product of Lexus, the LX’s four-wheel drive performance is commendable. Whether it is testing the power distribution capability of the front and rear axles or the limited slip capability between the wheels, it has performed well, and it seems that there is nothing. Too difficult. In the extreme case where only one wheel has adhesion in the face of the test, it can also finish the test smoothly and has excellent off-road ability. The powerful torque output of the engine and the responsive electronic assistance system are also the keys to help it get out of trouble smoothly. In all fairness, LX has such test results can be regarded as matching its million-class SUV worth. However, it is not equipped with a traditional mechanical differential lock between the first two wheels and the rear two wheels. Instead, it is replaced by an electronic auxiliary system. Its reliability during frequent off-roading inevitably makes us a little worried. After all, there are times when the electronic system may not be mechanical. Reliable. But think about it, who would drive such a luxurious and comfortable SUV every day to go off-road frequently? I have to say that while taking into consideration luxury and comfort, the off-road capability of the Lexus LX is sufficient.

Next, I bring you a hard-core off-road vehicle that shares the platform with the “Prado”. It is the 2014 Lexus GX400. The Lexus GX is a luxury SUV positioned between the LX series and the RX series. The face design is even more domineering, with a practical non-carriage body and a full-time four-wheel drive system as a whole. Can such a perfect combination really meet our challenges? Let's take a look at its four-wheel drive performance.

Lexus GX 2014 400 Deluxe Edition

Model Homepage| Parameters Configuration| Picture| Word of Mouth| Model Quotation
Manufacturer's guide price

848 thousand

Model introduction:

The Lexus GX400 was launched in October 2013. The price of the low-profile model is 75,000 different from the old model. The price/performance ratio has been improved. The panoramic camera, LED headlights, steering wheel heating and other luxurious configurations are integrated. It is an off-road performance and comfortable driving. Riding in a perfectly integrated medium and large SUV, low-speed four-wheel drive torque amplification, all-terrain feedback system, central differential lock manual locking function, strong climbing and escape capabilities, can easily cope with various complex road conditions. If you want to learn more about other aspects of this car, you can read the previous article: “Add family elements to make a real shot of the 2014 Lexus GX400” to read it.

Four-wheel drive structure:

From the structural point of view, the GX400 is basically the same as the Toyota Prado 4.0L four-wheel drive system of the same family. Its core component is the transfer case in the middle and the electronically-locked Torson limited-slip differential. At the same time, the four wheels have With electronic auxiliary braking function, it can calmly cope with various complicated road conditions. In extreme situations, the driver can turn on the central differential lock and the front and rear wheels will get the torque distribution at a ratio of 50:50. Of course, as a hardcore SUV, the ability to get out of trouble off-road is more than that. Under the low-speed four-wheel drive, the torque of the vehicle will be enlarged by 2.6 times.

Power distribution test between shafts :

The test between the front and rear axles did not pose a big test for the GX400. Whether it is the loss of adhesion of the two front wheels or the two rear wheels, it is not difficult for it to successfully get out of trouble.

Cross axis test :

Place the two pulley blocks on the front axle and the rear axle respectively to simulate the situation of one wheel slipping on the front and rear axles. At this time, the Torson differential will detect the torque loss and automatically lock, plus the front and rear wheel electronics The intervention of the auxiliary system helps the vehicle to get out of trouble smoothly.

Single-round landing test:

After seeing the cross-shaft test, let us see how it copes with the most difficult three-wheel block test. The three wheels of the vehicle are in a state of losing adhesion, and only one wheel can be used to get out of the problem. The whole test result is very smooth. The electronic assistance system exerts effective braking force on the three wheels, and transmits the engine power through the Torson differential to the unslip wheels to get out of trouble and pass the barrier smoothly.

After actual testing, we can draw the following conclusions for the Lexus GX four-wheel drive system:

Advantages: The multi-terrain electronic assistance system is simple to operate and can cope with various complex situations.

Disadvantages: There is no hardware locking system between the front and rear axles. It only relies on VSC (that is, ESP or ESC we often call) electronic braking. It is not difficult to cope with short-term relief, but long-term high-intensity relief may lead to electronic The system is overheated and the possibility of failure to escape is higher.

to sum up:

After completing the four-wheel drive test of Lexus GX400, we can clearly see that there is no pressure to cope with simple escape. However, when we see the electronic system that has been tested for many times overheating, we should not blindly and confidently take it to the high Intensity cross-country venues are better.

As the newest member of the Lexus SUV family, Lexus NX shows the latest family design style in appearance, and the shape is very avant-garde and dynamic. What is the difference between the four-wheel drive system of the NX300h we tested this time and the previous models, and how the specific performance is, let us take a look.

Model introduction:

Lexus NX 2015 200t All-wheel Drive Fengshang Edition

Model Homepage | Parameter Configuration | Picture | Word of Mouth | Model Quote
Manufacturer's guide price

39.80 million

Lexus NX was launched in November 2014. Its appearance is sharp, with prominent lines and a sporty style. The car has three different power systems to choose from, with a 2.0L naturally aspirated engine, a 2.0T turbocharged engine and a 2.5L hybrid system. In terms of four-wheel drive system, NX200 and NX200t models use a timely four-wheel drive system, while NX300h models use an electric four-wheel drive system.

Lexus NX 2015 300h All-wheel Drive Edge Edition

Model Homepage | Parameter Configuration | Picture | Word of Mouth | Model Quote
Manufacturer's guide price

59.90 million

NX200/NX200t four-wheel drive structure:

NX200/NX200t adopts a timely four-wheel drive system and a multi-disc clutch type central differential. In theory, the front and rear axle power can be freely distributed between 100:0-50:50. In normal driving, the vehicle is front-wheel drive, and the power is automatically distributed to the rear wheels when the front wheels slip. When the vehicle is turning, the system calculates the power required by the front and rear wheels based on information such as steering angle and vehicle speed, and automatically adjusts it. The four-wheel drive version also has a LOCK function, which can forcefully maintain the multi-disc clutch for a long time in a low-speed state (about 40km/h) to cope with light off-road conditions.

NX300h four-wheel drive structure:

The NX300h itself uses a hybrid system and a 2.5L engine with Atkinson cycle. The maximum power of the gasoline engine is 115 kW (156 hp) at 5700 rpm, the maximum torque is 206 N·m/4400-4900 rpm, the maximum power of the electric motor is 105 kW (143 hp), the maximum torque is 270 N·m, and the overall system power is 145 kW (197 hp) , Matched with a 6-speed ECVT continuously variable transmission.

The NX300h’s four-wheel drive system is also special. There is no drive shaft connection between its front and rear axles. Only one cable is responsible for transmitting power. The rear wheels are driven by a separate electric motor. The maximum power of the electric motor is 50 kilowatts (68 horsepower). The maximum torque is 139 N·m. The power distribution of the front and rear axles is done entirely by computer. Both front and rear axles use open differentials, and the four wheels are braked by electronic systems for limited slip.

Power distribution test of front and rear axles:

We mainly test the NX300h model. Its electric four-wheel drive structure is rare in the market. Let's take a look at its performance. In the power distribution test between axles, we let the two rear wheels and two front wheels of the vehicle lose their grip, respectively, to see whether the vehicle can get out of the trap with the two wheels with adhesion. The NX300h's four-wheel drive system has no difficulty in coping with this situation, and will be able to get out of trouble without excessive slippage. Of course, this is also the most basic project, and it is not difficult to pass this project.

Cross axis test:

Passing the inter-axle test is just the most basic item. Next, we will place the pulley block on the right front and left rear wheels respectively to simulate the cross-axle working condition on flat ground. This project mainly tests the vehicle's inter-wheel limited slip capability. Since the front and rear axles of the NX300h are all open differentials, the limited slip between the wheels relies on the body stability control system to apply braking force to the slipping wheels, so that the wheels with adhesion on the opposite side can obtain sufficient torque. From the actual performance point of view, its wheels will have obvious slippage, but the electronic system will intervene in time to apply sufficient braking force to the idling wheels to allow the power to flow to the wheels that still have adhesion to help the vehicle get out of trouble.

Single-round landing test:

The last is the most difficult single-wheel landing test project. When only one wheel has adhesion, see if the vehicle can get out of trouble. The actual situation is that when there is only one wheel on the ground, the vehicle has slipped for a long time, and the electronic system does not have enough braking force on the slipping wheels, so that the wheels with adhesion cannot get enough power to get out of the trap, and finally fail to pass. test.

After actual measurement, we can make the following conclusions for the NX300h four-wheel drive system:

Advantages: Full computer control, no manual operation, simple and easy to use.

Disadvantages: Can not get out of trouble in the extreme situation of dealing with a single-wheel landing.

to sum up:

The four-wheel drive system of Lexus NX300h is more unique in structure. The design of independently configuring the electric motor for the rear wheel is also the development direction of the electric four-wheel drive system in the future. Judging from the actual test performance, this system performed well in the two projects of power distribution between axles and power distribution between wheels (cross axles), and they can easily pass the test. The inability to get out of the trap in the single-wheel landing project indicates that there is room for improvement in the cooperation of the electric motor and the electronic brake system.

● Model introduction:

Lexus RX series models are urban SUVs launched under its brand for urban road conditions. Except for the RX270, which is a front-wheel drive, the RX350 and 450h are all timely four-wheel drive vehicles. What we are testing today is an RX350. So, what is the performance of this urban SUV's four-wheel drive? Let's take a look at the actual test situation below.

Lexus RX 2013 350 Deluxe Edition

Model Homepage| Parameters Configuration| Picture| Word of Mouth| Model Quotation
Manufacturer's guide price

78.70 million

The RX series models currently on sale have three power configurations. The RX270 is equipped with a 2.7-liter four-cylinder naturally aspirated engine with a maximum power of 188 horsepower; the RX350 is equipped with a V6 engine with a maximum power of 277 horsepower; RX450h The power system is a hybrid form of oil and electricity. The maximum power of the 3.5-liter V6 engine is 249 horsepower, and the maximum power of the electric motor is 173kW (235 horsepower). Among them, RX270 and RX350 are matched with a 6-speed manual transmission, and RX450h is matched with a CVT continuously variable transmission.

● Four-wheel drive structure:

The RX350 uses a timely four-wheel drive system with an electronically controlled multi-disc clutch limited-slip differential in the middle and no electronic brake assist device. From the configuration point of view, this system has a certain degree of stability when driving in bends and ensures that it can obtain higher traction on slippery roads or non-paved roads. However, the vehicle will face great difficulties if it encounters relatively harsh off-road conditions such as cross axles.

● Power distribution test of front and rear axles:

● Cross axis test:

● Single-round landing test:

Advantages: Four-wheel drive at the right time, easy to operate.
Disadvantages: There is no electronic brake assist, and the ability to escape difficulties is poor.

to sum up:

From the above tests, we can see that the off-road capability of the RX350 equipped with a timely four-wheel drive is worrying. When you need to drive in the wild, you need to pay more attention to the road conditions. Aiming at the positioning of urban SUVs, it mainly tends to show comfort and daily driving stability. However, it still feels a bit awkward without electronic brake assistance, after all, the price of the vehicle has exceeded 700,000.