Cutting-edge technology
The first E-class equation game held in Beijing allows the car to boil, and it also proves that the series is not a head. In this fierce event, the champion event was finally obtained by the Audi Sport ABT team before F1 drivers Lucas di grassi. The average speed of Di Grassi was 127.5 km per hour (79.2 miles per hour) in a total of 52 minutes. In the second one is the Andretti team's foreleno F1 test driver and the three-level equation player FRANCK MONTAGNY, the score is only 2.9 seconds behind.
Although the performance of the E-class equation is excellent, it does not have much surprises from car engineers engaged in commercial EV design. Although the latest EV multi-purpose lithium ion power supply group, the energy density is approximately 700 watts / liters, far below the 10 kWh / liters of gasoline, but EV does not discharge toxic gases, and some other advantages. The key point is that the efficiency of the motor is higher than the gas engine, and the conversion rate of EV electrical energy to the mechanical energy is 75% to 85%, while the gas engine chemical can be converted to mechanical energy. 25%. To 30%. Second, the EV motor is more compact, saving more space than the gasoline engine, so you can accommodate more batteries and bring greater overall energy. (figure 1)
Figure 1: EV electric motor, such as this used in BMW I3, more lightweight is smaller. (Copyright: BMW)
Despite this, the overall performance of traditional cars is better compared with the EV of the mid-range, and the cruise range is also larger. Correct reasons, mainly because the internal combustion engine has more than 130 years of historical research and development accumulation. Although the EV itself may be earlier than everyone - battery power cars dates back to the 1930s, maybe even earlihood - but only over the past 20 years, major automakers have put into available resources for EV Inter-intensive development.
Such a result is that electric cars are quickly caught up with fuel cars. For example, Tesla's latest product, Model S, is a rear wheel-driven electric vehicle, its power derived from a lithium-ion battery group at 60 or 85 kWh. The MODEL S has a three-phase four-pole AC induction copper rotor motor mounted in the middle of the rear axle, with a liquid cooling power assembly, which can drive 2100 kg (4630 lbs) of 210 km / h (130 miles) The highest speed is driving, and the battery is 425 km (265 miles). This taller has other features, including a variable frequency drive and a brake system with energy recovery.
The torque and power generated in the gas engine during low speeds are small, which means that the engine can quickly increase the speed to achieve a good acceleration effect by a series of gears. Even so, the maximum power and torque are limited only to the relatively narrow rotation speed section, and the speed of the maximum value is half the maximum value of the maximum torque, and the maximum speed is close to the maximum limit, so that in order to meet the different road conditions, it is necessary to frequent Shift (Figure 2). In contrast, EV can output maximum torque at the beginning, and smoothly provide power, only in the highest speed of the tail of the tail. Accordingly, the output power of the motor will be smoothly increased over the entire speed range, even if the tail of the speed limit is substantially not decreased (Fig. 3).
Figure 2 The internal stretch engine speeds half of the maximum value at the peak torque output, and the peak power output is limited to relatively narrow speed range. (Copyright: Woodbank Communication Co., Ltd.)
Figure 3 The motor starts output peak torque from the zero speed, and the vehicle accelerates very fast. (Copyright: McAllar wheel application technology)
Since the motor output power is special, EV with lower nominal performance is close to a traditional vehicle that is close to a performance. For example, Model S has a 310 kW (416 hp) engine whose output torque is 600 Nm (443 pounds), which can push the vehicle from 0 to 100 km / h (62 miles) within 4.2 seconds. This acceleration effect even exceeds BMW M5, you know that the latter is a high-performance European sports car, with the same size similar to the former, only slightly low (1945 kg (4288 lbs)), but there is a 418 kWW (560 horsepower), 680 Num (500 pounds) fuel engine. Read more
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