When it comes to Nissan, most domestic consumers may use keywords such as economics, practicality, spaciousness, and comfort to make keywords, while others will tell you about 370Z or even "God of War GT-R"... People learn from Infiniti Nissan’s interpretation of luxury has also seen Nissan’s strength in chassis tuning and engine development from a series of sportsmen and events, but when people talk about safety and new energy, they are rarely the first. Time to mention Nissan. In 2011, Nissan's advanced technology briefings made me discover that Nissan actually has a lot of capital that can be used to show off in these aspects.
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Nissan's new technologies displayed in this briefing are mainly divided into three aspects: safety, environmental protection (zero emission/low emission) and basic technology application. “Safety†is one of the most concerned topics in Japanese domestic cars, so we First of all, look at Nissan's achievements in this regard.
â— The concept of "Safetyshield"
Nissan has set a safety target of halving the number of casualties in traffic accidents in 2015 (based on the number of deaths/severe injuries per 10,000 Nissan vehicles), but this goal was basically achieved in advance in 2009, so Nissan is Under the basic concept of "car protector", the concept of "safety barrier" was introduced. This concept is easier to understand by using the moves in Chinese martial arts novels. It is like adding one after another to the car. "The Golden Bell" allows you to hit neither others nor be hit by others.
At present, the construction of “safety barrier†mainly relies on the vehicle panoramic monitoring system, radar equipment, and the excellent performance analysis system to monitor the environment around the vehicle in real time, and then intervene the driver's behavior through the vehicle control system and protect the occupant's safety. But the current system is costly.
In order to reduce the cost of the system and make it more widely applicable to low-end and mid-range models, Nissan has introduced a multi-sensor system that can provide "four front and rear" safety directions in four directions. This system has most of the functions of the current "safety barrier" and can be put into production cars at a lower cost, which will be a boon for the average consumer.
Forward/rear view multi-sensor system
----Super integrated function collision prevention / lane keeping / monitoring pedestrian vehicle / blind zone prompt...
The forward-looking multi-sensor system is very powerful, and its processor can automatically lock the vehicles and pedestrians in the front camera in real-time through the pre-stored information, and display them in different colors (Pedestrian Green, Vehicle Red), and will also The distance of the targets is displayed on the display. When there is a sudden vehicle or pedestrian exit in front of the vehicle, the system will issue an image and audible alarm to alert the driver.
It also provides lane keeping, which emits an audible and visual alarm when the vehicle crosses the lane without turning the turn signal. At present, it can only function as an alarm, and there is no function of intervention and correction. It may be bound with other modules in the future when it is equipped with a production car, providing more functions.
Rear view multi-sensor system
The rear view multi-sensor system is also based on a single rear camera, which takes into account more functions than the front view system. First of all, it can take on the function of the conventional reversing camera and provide image assistance for parking. Compared with the traditional video parking system, it is characterized by the ability to detect moving objects while detecting a wider angle. It can be behind the car. Sound and video alarms are issued when there are pedestrians and vehicles, which reduces collisions and pedestrian injuries during parking.
The rear view camera simultaneously assumes the function of monitoring the left and right side blind areas. When the vehicle approaches and enters the blind spot at the rear, the screen will prompt the driver, and the blind spot indicator at the position of the outer rear view mirror will also light up, prompting the rear blind spot. With vehicles, the blind spot reminder system of most of the previous vehicles is realized by the camera under the exterior rearview mirror or the parking radar. These two methods are higher in cost and the other system is not as good as Nissan in terms of function and visibility. . The rear-view multi-sensor system will be gradually installed in Nissan (Infiniti) new cars from 2012, and Chinese consumers are expected to use this configuration soon.
Practical review
The powerful real-time monitoring function of the forward-looking multi-sensor system not only automatically identifies vehicles and pedestrians, but also displays the distance between the current vehicle and them, helping the driver to make better judgments. This is very practical for small cities with crowded cities and small cities with disordered traffic. However, I believe that most Chinese will close the "lane departure warning system", because in the country, people always like to shuttle between the lanes... Chongqing Wuhan's driver friends know best...
Forward Collision Warning System (PFCW)
----Let you have a "perspective eye"
In terms of active safety, Nissan is not lagging behind German competitors. The DCAS (Distance Control Assist System) has been introduced 3 years ago, with Mercedes-Benz Pre-safe and Audi Pre- Like sense, it can automatically control the throttle opening and braking force, maintain the distance from the front car, and in extreme cases can provide the maximum braking force to avoid or reduce the damage caused by rear-end collision. The system can be below 60km/h. The speed is completely avoided (60km/h reduces damage during collision).
For Nissan, the system will also be a thing of the past. The current front collision prevention systems (including the basic adaptive cruise control system) are all vehicles in front of the vehicle. Many of the rear-end collisions are actually sudden braking of the vehicle in front of the front car, and the front car suddenly changes line, and the vehicles behind it are too late to take measures. PFCW (predictive forward collision warning) solves such a problem. Its front-end ranging radar forms a fan shape with a radius of about 150 meters and 30 degrees. It monitors two cars in this scanning range. The current car is off-line and the front car When the front car quickly approaches (brake), the vehicle will sound and the instrument image will alarm. What if the front car did not go off the line? The DCAS system works directly.
Practical review
In Japan, such rear-end collisions caused by braking of vehicles outside the field of vision have a high incidence, and this problem is also faced in countries with chaotic traffic, whether it is urban or highway, PFCW is practical. The value is very obvious, especially for new drivers with insufficient driving experience and slow response speed. This system can prompt the driver to intervene in time, and can prevent the reaction from being unsatisfactory due to insufficient concentration. , the situation of rear-end collision.
However, from a general point of view, it is not difficult to find that this system is based on the evolution of the panoramic monitoring system, and most of the systems equipped with this system are high-end Infiniti products, which means that the system does not It is likely to appear on low-end models. Engineers also said that Infiniti products will be the first to carry this system.
Accidental pedal acceleration suppression system
Extended application of radar system and 360 body vision system
The panoramic image monitoring system is not a new configuration for the current passenger car, but Nissan gives the system a higher degree of intelligence. It can judge whether the vehicle is in the parking lot by identifying the ground marking. When the system considers that the vehicle is parked in the parking lot, the "false pedal acceleration suppression system" is activated. When the system is working, the action of slamming the accelerator pedal is ineffective, the vehicle will not accelerate forward, and the parking radar system of the vehicle will automatically brake when the vehicle is too close to obstacles (walls, etc.). Stop to prevent accidents. Moreover, it is important to note that this system can also function when reversing.
Practical review
In China, there have indeed been many accidents caused by newcomers who mistake the throttle as brakes. However, many parking lots in China do not have marking lines. How is this system recognized? On this question, what I got from Nissan's staff is the answer: in this case, although the panoramic detection system cannot make a judgment, the radar system of the vehicle is always working when the vehicle hits the obvious obstacle. At the same time, the radar system will still intervene to brake. For domestic consumers, this technology I think can be understood as an evolution of panoramic monitoring technology, and its function is not only to prevent mistakes - to prevent accidental stepping on the accelerator pedal, it can be further guaranteed by active braking The safety of the vehicle is still valuable to domestic consumers, especially newcomers, but the practicality is not as attractive as the previous technologies.
â— Basic technology application
1.2Gpa high strength steel application
---- Not because of the yield strength of the cow X, but because of the excellent ductility!
Nissan and Nippon Steel and Kobe Steel have developed 1.2Gpa ultra-high strength steel. 1.2Gpa is actually 1200Mpa, don't get dizzy by this new unit. Many people may not agree with this value. Yes, it is not uncommon for the industry to use steel with more than 1000Mpa on structural parts. It is also not news to use steel of more than 1500Mpa.
However, the focus of this high-strength steel is not the yield strength, but the high ductility of the steel. The advantages of high-strength steel are very clear. The same yield strength, high-strength steel is lighter in weight and can guarantee strength. At the same time, it provides a lightweight body, which has a significant contribution to the economic and vehicle handling performance. However, the ductility of ultra-high-strength steels is often poor, the formability is not good, and the processing is difficult, and the highlight of this ultra-high-strength steel jointly developed by Nissan and the steel company is here! It achieves a yield strength of 1.2Gpa, and the ductility is comparable to that of the traditional 780Mpa high-strength steel material! The corresponding structural parts no longer require heat treatment and can be directly cold formed into stamping. At the same time, it matches the high-strength steel spot welding technology developed by Nissan. This high-strength steel can be used more widely on the vehicle body than before. This steel will be used in the structural parts of Nissan's new car from 2013. We can wait to see the crash test results of major institutions to verify its effect.
The new ergonomic chair is "tired"?
----Chair from space
Nissan engineers have developed a new car seat with reference to NASA's “Minimum Load on the Human Body†design. The back of the chair is designed with a folding support to keep the torso relaxed, reducing the burden on the muscles and spine. Also not easy to fatigue.
Through the repeated trial and comparison of the human muscle model and the seat simulator, the engineers found the ideal backrest angle. We can find the new seat through the pressure distribution map obtained by the same person in the traditional seat and the new seat. The contact area with the back of the human body is larger, and the stress on the back muscles and lumbar vertebrae is significantly lower than that of the conventional seat, and the comfort is higher.
â— The future of power technology "zero emissions" is the core
Nissan has introduced the concept of zero emission and pure drive. Pure dirve is a technology that targets “near zero emissionsâ€, including new hybrid, gearbox and engine technologies.
New hybrid system, two clutches + single motor
For the rear-wheel drive and the front-wheel drive models, Nissan has introduced two new hybrid systems, the most unique of which is the design of two clutches + single motor, controlled by the opening and closing combination of the two clutches in front of the motor. The flow of power, the motor is the second job, both for the motor used for driving and for the generator.
We briefly experienced the Nissan FUGA hybrid model (FUGA is the domestic Infiniti M35), and the 3.5LV6 engine combined with the 50 kW, 270 Nm motor can achieve a fuel consumption level of 5.26 liters / 100 km.
Another hybrid system for front-wheel drive vehicles is still in the research and development stage. It uses a small-displacement four-cylinder supercharged engine as the main power. It also uses two sets of clutch + single motor design ideas, and the fuel consumption level will be better than The V6's rear-wheel drive hybrid system is also superior.
The new look of the CVT gearbox
Nissan also showed us the new Xtronic continuously variable transmission for 2.0-3.5 liter displacement and the Xtronic CVT transmission for displacement below 1.8 liters. The latter is more familiar to us, it is SUNNY in China. Sunshine and Xindada have been matched on the models. The main features are compact structure and auxiliary shifting mechanism. In fact, the planetary gear structure of this auxiliary shifting mechanism is common on other CVTs. It is controlled by clutch control to switch forward/reverse and Neutral, except for Nissan, in addition to this function, the function of twisting the planetary gear is also used. Simply understand, you can think of Nissan moving the position of the planetary gear from behind the torque converter to the final drive (of course it's more than that simple...).
The other "new" CVT gearbox for medium and large displacements has expanded the speed ratio range (6.0 to 7.0), through the use of low viscosity oils, increased partitions, lower oil levels and reduced oil pumps. The friction of the new gearbox has been reduced by 40% and the economy has increased by 10%. Although it looks more like “optimization†or “improvementâ€, considering that about 60% of the entire gearbox has been redesigned or optimized, it is still acceptable to call it “newâ€.
The gearbox has evolved in logic control and function. The adaptive speed ratio control system that adjusts through throttle and steering wheel changes can better meet the driver's needs. For example, the gearbox will remain fixed in a multi-bend mountain road. The speed ratio allows the driver to get the power he needs in time to better experience the mountain driving pleasure, while working in the most economical state when driving and cruising in the city. From a short experience, this gearbox can give you a feeling of a strong start, not obviously suppressing the engine's power output at the beginning of the start, and the response to the accelerator pedal is very agile during the acceleration, but the continuous curve is too Less, there is no chance to appreciate the improvement it has made in this aspect.
More compact fuel cell
Japan is one of the few countries in the world that actively promotes the commercialization of fuel cells. Therefore, Japanese auto companies have more or less relevant fuel cell products. Nissan has already launched a proven fuel cell in 2005. This time for the participants, it is a more compact new generation fuel cell product.
The so-called fuel cell is to make the chemical reaction between the fuel and the oxidant, and to form a current through electron transfer, which converts the chemical energy directly into electric energy, and the obtained electric energy is used to drive the high-efficiency electric motor. It is different from the electric car. By "powering up", you need to refuel without charging. At present, the fuel of most fuel cells is hydrogen, and the product of oxygen and water is water, and the carbon emission is zero, which is completely harmless.
However, fuel cell vehicles are highly dependent on infrastructure construction. To achieve normal operation, a large number of hydrogen refueling stations like gas stations are needed. The current production cost of hydrogen is still high, and low-cost manufacturing methods are mostly in the scientific research stage. And hydrogen storage and transportation have higher risks, these factors have affected the development speed of hydrogen fuel cells.
Listening to the wind electric car - technology and experience
The wind electric vehicle is the backbone of Nissan's “zero emission†target, and domestic consumers are already very familiar with it. It is equipped with a permanent magnet synchronous motor with an output of 80 kW and a maximum torque of 280 Nm. The maximum speed is 90 mph (about 144 km/h). Powering the motor is a lithium battery pack consisting of 48 battery modules with a total capacity of 24 kWh. The compact design of the cascading makes the lithium battery smaller. The maximum output is 90 kW and the cruising range is 100 miles (about 160 km) when fully charged.
The wind provides two types of charging methods, namely, household charging and fast charging, and provides dedicated slots for the two methods. In Japan (200V) and Europe and the United States (240V/230V) in the domestic power grid environment, it takes 8 and 7 hours to fully charge the battery pack. Under dedicated fast charging conditions (3-phase AC 200V, 50 kW power), it can be filled with 80% of electricity in just 30 minutes.
In the experience of listening to the wind, I found that engineers can make the driving of this car as simple as ordinary cars. For consumers who are used to "cough, cough, sputum~~", this kind of wind The silent start will inevitably make people unaccustomed, so when the vehicle starts, there will be a preset sound, telling you that the car has been activated without knowing it. For pedestrians outside the car, this quiet electric car can also make some sounds through the external speakers as they approach them, to ensure that people can notice that there is a car.
Except for the "gear lever", basically the feel of driving is not significantly different from that of a regular car. The motor responded very quickly to the "throttle" pedal. Despite the strict speed requirements during the test drive, I found that it is very difficult to slow down such a car. With a little "throttle", it will actively run forward. The kind of frivolity is really like its car name "leaf" (leaf), you may even think that the wind is blowing this guy forward.
Although there is no shrill and tremor of the traditional engine, the torque of the motor up to 280 Nm can press you more directly on the seat at the start, because the battery pack is at the bottom of the car and The position of the center of the vehicle makes the center of gravity of the vehicle more rearward than the front-wheel drive model and has a lower center of gravity. It has better stability and a good handling foundation, and the presence of the battery bracket also plays a role in strengthening the rigidity of the body, further enhancing The rigidity of the vehicle, the texture of the control will make you feel more stable than the hatchback sedan of the same size. Just, I don't know why, the brake pedal of the wind is very "hard" because the power of the electric vacuum booster pump is not enough?
At the briefing, Nissan introduced that the wind has an advanced IT system. The function is far above the scope of “CARWINGSâ€. Many online functions sound really new, but the hasty experience does not give us time to feel these. In the details, I hope to have the opportunity to elaborate on its intelligent interactive system in the future.
The wind has a big advantage in production, that is, it can be produced in line with ordinary models, and the installation of components is perfectly integrated into the production station of ordinary models, but these still fail to reduce its cost to The level of conventional power models is comparable. Although you don't need to pay for the replacement of "oil", "air filter", "vapor filter", "official belt", "spark plug", etc., but high-capacity and high-density batteries and electric drive cores are expensive, you are When you buy the wind, you spend a lot more money than the same model. The starting price of the wind in Japan is 3.76 million yen. Even if the government subsidy of 780,000 yen is removed, it still needs nearly 3 million yen (about 250,000 yuan). This price can buy two cars.
At present, the main bottleneck of electric vehicles is the problem of battery cost and capacity. In terms of capacity, the cruising range of about 160 kilometers of the wind can basically meet the daily travel needs of consumers in big cities in China, but it is not possible to drive long distances. On the other hand, the length of the electric vehicle is subject to infrastructure construction. Take Japan as an example. Although we have seen the privately-owned wind-driven electric vehicles on the streets of Yokohama, there is no such thing as Nissan and GRANDDRIVE. In other places where the vehicle's charging facilities, the construction of the charging network is not yet popular. Moreover, the problem of charging speed will also restrict the use of electric vehicles in the future. Even using a fast charging station takes half an hour to charge. In contrast, gasoline and diesel vehicles only need a few minutes to refuel, in this respect fuel The battery has an advantage. The above factors make it difficult for users who do not have charging conditions in their homes (such as most Chinese) to use electric vehicles.
In the wind, there are two more avant-garde technologies that are more futuristic.
--Wireless charging technology and Leaf to home power supply technology
Using the principle of electromagnetic induction, Nissan developed wireless charging technology for the wind, which makes the vehicle charging more convenient. The main equipment is the power supply system and two sets of coils, one set at the charging equipment terminal and the other assembled in the wind bottom. position.
The wireless charging technology uses a household power supply with a power of 3 to 6 kilowatts, and the efficiency can reach 80% to 90% of wired household charging equipment. My only concern is: The wireless charging device base forms an open electromagnetic field when charging. What is its radiation intensity? Will it affect the health of the human body?
The answer we got was that Nissan's charging equipment meets the safety standards of relevant departments in terms of the amount of electromagnetic radiation. In the future, the introduction of wireless charging devices in countries such as Europe and the United States will also comply with relevant local standards and regulations.
Nissan’s engineers even had an unexpected “feedback†idea on the wind, and a wind with a 24 kWh battery could meet the electricity consumption of a Japanese family for two days. It can be used for families in the event of a power outage. Power supply can also supply power to vehicles such as campers in places where there is no power. At the same time, the wind can also be used as energy storage equipment for home solar/wind power systems. Why not? The power of the venue we attended that day was provided by the outdoor listening wind.
summary:
In the above-mentioned dazzling technical display, a considerable part of it is still in development, it will take some time to match the production car, but CVT transmission, hybrid technology, rear view multi-sensor system, etc. have been or will soon Will come to us, I am concerned about the degree of popularity of these technologies that Nissan wants to “popularizeâ€, and whether it can really give most domestic consumers the opportunity to experience the advanced concepts of Nissan in technology. Through this brief experience of the wind, I am also looking forward to the future of the "Qinchen" brand of Dongfeng Nissan to introduce electric vehicles produced by the company.
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