On March 26, the "China Heart" 2022 Annual Power Day was held in a combination of online and offline, and was divided into three selections: "China Heart" 2021 Top Ten Engines, Top Ten New Energy Vehicle Power Systems, and PowerTrain Parts. Among them, the "Heart of China" 2021 Top Ten Energy Vehicle Power System and its installed models include electric, plug-in hybrid, and range extender all three technical routes. FAW-Volkswagen Audi e-tron successfully selected the "Heart of China" 2021 Top Ten New Energy Vehicle Power System, and the excellent electric drive system is the key to its success.
Advanced and efficient three-electric system leads the era of luxury electric
The battery can be described as one of the cores of pure electric vehicles, and its importance is self-evident. The Audi e-tron battery pack has a total capacity of 96.7 kWh, an energy density of 142.00Wh/kg, a total voltage of 396 V, and a maximum cruising range of up to 500 km (NEDC). With Super Fast Charge, it only takes 40 minutes to move the battery from 5% to 80% of the total capacity.
As the signature technology of the Audi brand, the quattro four-wheel drive lays the foundation for Audi's proud handling advantage in the era of fuel vehicles. The e-quattro equipped with the Audi e-tron is an epoch-making upgrade of the quattro technology. As an electric four-wheel drive, the e-quattro can realize stepless distribution of front and rear torque, and the instantaneous torque output of the motor makes the response time (30 milliseconds) only a quarter of the mechanical quattro, so that the handling performance has evolved to a whole new level.
The Audi e-tron uses Audi's own AC asynchronous motor, which does not have high temperature demagnetization problems compared with permanent magnet synchronous motors, and has better consistency under long-term use. Secondly, the operating efficiency at high speed is higher than that of the permanent magnet synchronous motor, and there is no back-drag of the permanent magnet synchronous motor. When driving in two-wheel drive mode, the rolling resistance and power consumption of non-drive motors (to counteract the power consumption of backwing) are much smaller than those of permanent magnet synchronous motors.
The motor controller, which is highly integrated with the motor assembly, brings a 60-liter front load compartment to the Audi e-tron. The motor of the rear axle uses the coaxial structure form, although the manufacturing process is very complex, but the space is small, the structure is compact, it is the only model in the same class that adopts this structure, and also allows the trunk to make better use of the Z-direction space, with a volume of 660 liters.
The intelligent global thermal management system makes winter life worry-free
The low temperature endurance caused by the cold climate in winter is greatly reduced, on the one hand, due to the electrochemical principle, and the increase in the internal resistance of the battery caused by the low temperature makes the usable capacity decrease. At the same time, in order to maintain the activity of chemical elements in the battery, it is also necessary to achieve battery insulation by discharging, which invisibly increases the power consumption. After the heat generated by the traditional internal combustion engine is reduced, most electric vehicles need to use PTC (thermistor) for heating, and in extreme cases, the winter mileage of electric vehicles can even be reduced by about half.
In order to successfully solve this consumer pain point, Audi e-tron uses 22 liters of large-capacity coolant and tens of meters of cooling line in the thermal management system, with an operating temperature range from -30 degrees to 50 degrees, 4 sets of thermal management circuits and 11 working modes. Fully connect the cooling and heating needs between the motor, battery pack and cockpit, and do not waste every cent of energy, for example, the heat generated by the motor can be used to keep the battery pack warm.
The Audi e-tron also comes standard with a heat pump air conditioner that is more energy efficient than PTC (thermistor). Heat pump air conditioning can absorb and carry heat from the environment into the interior of the vehicle, and the thermal efficiency is much higher than PTC, thus contributing to the increase of the mileage in winter.
The Audi e-tron also provides users with a preheating function that allows the vehicle to charge the battery to a preset level near the departure time, and makes full use of the fast-charge power to heat the battery to raise the battery temperature to the appropriate temperature, significantly improving charging efficiency. By preheating the battery, the loss of mileage during driving is greatly reduced. Regardless of the extreme conditions, the efficient and intelligent thermal management system keeps the Audi e-tron's battery packs within the optimum operating conditions from 25°C to 35°C, resulting in excellent winter endurance.
For many car companies, especially new energy vehicles, there are still many challenges to go forward. In March this year, the State Administration for Market Regulation issued the "Notice on the Recall of Automobiles and Consumer Goods in 2021", showing that in 2021, the mainland implemented 59 recalls of new energy vehicles, involving 830,000 vehicles, accounting for 9.5% of the total number of car recalls in the whole year; the number of new energy vehicle recalls and the number of recalls accounted for 29.3% of the total number of recalls in the whole year, accounting for 52.5% of the defect clues of new energy vehicles.
This also warns companies to always put the safety of new energy vehicles in the same important position as market growth. With its excellent car manufacturing concept and rigorous vehicle testing, Audi e-tron first ensures driving safety and solves users' car purchase concerns. In such a big environment, the competition between traditional car-making enterprises and new forces in the new energy track is worth looking forward to.