BYD Tang 100 technology analysis of three points said the secret behind 4.9 seconds

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As early as the spring of 2014, BYD released the “542” strategy, accelerating within 5 seconds, driving 4 drives, and fuel consumption less than 2 liters per 100 kilometers. In the same period, we only saw that a handful of manufacturers are seriously making new energy vehicles. At that time, the BYD brand was not known, no one knew it. It can be said that it is the leader. Even the folks have the title of “new energy vehicles only buy BYD”.

After three years of tempering and numerous iterative upgrades, 542 technology has become the core of the brand, and it is still 542 that the market is most talked about. As the first model to brand the 542 tag, BYD Tang has been launching a new model in 2013, BYD Tang 100, a plug-in hybrid SUV that breaks the longest pure electric range. A brand-name model with the "Electric Future" brand. It appears to bring more quality choices to consumers, and before understanding it, I hope more people can understand the "black technology" behind it.

Core highlight one: the first three-engine drive, behind the 4.9 seconds is the cutting-edge technology

Opening the hood, a 151kW/320Nm 2.0T direct-injection supercharged engine is located in front of the front of the car. Apart from a few orange high-voltage wires, the rest is not much different from a regular petrol car. However, we will look down a little and find that a 110kW high-powered motor is installed above the front axle, and the line of sight is placed below the tail. Surprisingly, it is found that a 110kW large is installed on the transaxle like the front. Power motor.

The motor uses a permanent magnet synchronous motor with a maximum speed of 12,000 rpm/min. The same type of BMW i3 motor has a speed of only 11,400 rpm/min, while the TESLA Model S has a three-phase AC motor speed of only 8,600 rpm. Faster speeds are better at performance utilization. The motor has a power density of 3.9kW/kg and the BMW i3 is only 1.9kW/kg. In terms of competitiveness, BYD's 110kW motor has a maximum efficiency of 96%, while the Lexus LS600H has a motor power of only 95%. The combined product of the same type is only about 94%.

Tang's drive structure is quite special. The integrated output power can be calculated almost by “superimposition”, that is, the power of the front and rear motors adds up to 220 kW, and the maximum torque of 500 Nm. If the 2.0T 6HDT45 gearbox is superimposed with more power in the hybrid mode, the total power of the car is 371kW and the maximum torque is 820Nm. Perhaps it is not known what the concept of 820Nm is. For example, this torque value is equivalent to two Lamborghini Gallardo LP560-4 working on a treadmill at the same time.

When the throttle is stepped on the bottom, the motor takes priority over the internal combustion engine. The two 110kW/250Nm high-power drive motors instantaneously explode the full torque. In order to prevent the wheels from slipping due to high torque and ensure the balance of the power on both sides, the drive axle assembly is poorly open. Speeder. In the process of rapid acceleration, the vehicle still maintains a straight force, and then the intervention of the internal combustion engine is pushed to the "crazy" state, and the top speed reaches 180km/h.

The front and rear motors can work together within 20ms. When necessary, the dual motor drive brings the ultimate performance feeling. In most cities, the motor can be used as the main force of driving power generation. When necessary, the electric energy is transmitted to the rear motor. The flexible drive form of the internal combustion engine and the rear motor, in this mode, the fuel consumption per 100 kilometers of the whole vehicle is only 1.8 liters.

Core highlight two: Extreme speed electric four-wheel drive is easier to deal with a variety of road conditions, energy saving is one of them

After eliminating the important drive shafts in the traditional four-wheel drive module, the linkage bridges of the front and rear motors become a single wire. For example, Volkswagen Tiguan, Buick Angkewei, such a model to achieve four-wheel drive must have a bridge in the middle, we call the drive shaft. The meaning of the drive shaft is to transmit the power of the front output to the rear, which is the ideal solution for gasoline vehicles. However, its drawbacks are also quite obvious. First, the manufacturing cost is high. Secondly, the front and rear transmissions have a certain power loss. Finally, it can be seen that the second row of the central floor will arch a certain extent to affect the foot space.

In BYD Tang, even on all models equipped with 542 technology, not only the second row is not affected by the platform, but also the efficiency of the four-wheel drive is at least double that of the traditional structure. More importantly, when the gasoline car is still optimizing the front and rear gear ratios, the ultra-fast electric four-wheel drive can achieve the most extreme 50:50 transmission efficiency, and it is better than the traditional structure to have multiple modes to deal with different Road conditions.

The most powerful mode: four-wheel drive HEV

After selecting the “sports” driving mode in the HEV hybrid mode, the three engines jointly released the maximum power, and the measured speed of 1.89 seconds of 100 kilometers has become the performance benchmark in this field.

The most economic mode: four-wheel drive economy EV

After selecting the “Economy” driving mode in EV pure mode, the front and rear motors work together to reduce the output power to the most economical mode when necessary. The measured 100-kilometer pure electric energy consumption is only 17kWh/100km, compared to Tesla Model S. The 90D's 24kWh/100km is lower.

Driving mode

During the driving process, the user can adjust the preset value of the remaining SOC power. Once the remaining power is about to be less than the preset value, the system automatically switches to the “driving power generation mode”. The front motor is switched to the power generation mode, and the rear motor is combined with the internal combustion engine to form a front-oil electric drive. Driving in an urban environment, it can be supplemented with 1-2% of electric energy every 1.5km. When running long distances, the battery can be recharged to 70%, which will bring strong power protection for the next section of the city.

Idle power generation mode

Even if the SOC is less than 15%, the system automatically switches to the internal combustion engine to charge the battery when the traffic light is waiting. The actual measurement can supplement 1-2% of energy in about 5 minutes. Forced in-situ power generation can be used when necessary, and the throttle can be activated by pressing it in the P-stop mode. This mode is mainly used for emergency use. Once it encounters a natural disaster, the battery can be charged in this form to ensure the output of the VTOL 220V power supply.

Core Highlights 3: Those highlights of the silent innovation ternary lithium battery comes with a star aura

From lithium iron phosphate battery to ternary lithium battery, it mainly caters to the Ministry of Industry and Information Technology hopes that in 2020, the electric motor power density of the electric vehicle industry will be 3.5kW/kg, and the energy density of the battery will reach 250WH/kg. Lithium iron phosphate battery is currently the most mature car battery, limited to energy density relationship, lithium iron phosphate battery will be mainly used for public transport, and new energy passenger car gradually adopts ternary lithium battery.

The density of the old lithium iron phosphate battery is 170mAh/g, and the energy density of the 23kWh ternary lithium battery on Tang 100 is 277mAh/g, and the energy density is increased by 60%. In other words, in the same space, the battery pack of BYD Tang 100 has not only expanded, but also improved the pure electric life of 20 kilometers compared with the old model. And it is certain that the position of the battery pack is more ideal, so that the center of the body and the front and rear specific gravity are more upgraded. For the new battery module manufacturer, the battery will not decay more than 8% per year, and the remaining battery power will be 80% after 6 years.

In addition to these highlights, BYD Tang 100's NVH, suspension, throttle response and steering wheel directivity have been upgraded and optimized. Recently, Tang 100's gearbox driver software has been released to the old Tang upgrade, making the BYD Tang all models available. There is a big improvement in driving quality.

Summary of the full text: superior three-electric technology with more mature training

There is no doubt that BYD Tang 100 is the performance benchmark in the field of new energy vehicles. It has the strongest three-electric technology, the most ideal battery solution, and more importantly, from research and development to production of every component. It is undertaken by BYD, and the advantages in product consistency and safety control are very obvious.

BYD Tang's engineers also made it clear that each new product is not only optimized in terms of user feedback, but more importantly, a little breakthrough in the technical field, from 4.9 seconds to 3.9 seconds to 2.9 seconds in the future. The goal is to force the product to stand out from the crowd in every iteration. Technology is BYD's best field and the most proud of BYD people. As the brand's flagship model, BYD Tang 100 is leading the development of the new energy industry, while still affecting a group of fans of technology fever, in their words: BYD 542 technology is the key to their car purchase, but also the current new energy in China The only car in the automotive field that can be called Tesla technology.