On 5.1 Labor Day this year, counting the two transfers, 5 days off. There is still plenty of time to take a road trip. Pull up three or five friends, visit the great rivers and mountains, wonderful. Wear clothing, driving directions, and accommodation tickets, which must be prepared in advance. In addition, the car is best to go to the 4S shop to do a system troubleshooting to ensure that it is foolproof to the greatest extent.
However, friends who drive electric vehicles will have to spend more time, and they must query and collect information, and then do a charging strategy.
Most car companies such as Weilai, the comprehensive mileage of their pure electric vehicles, is tested in the NEDC working conditions. NEDC is the energy consumption test standard designed in the 1980s, and after it was launched, it has been changed intermittently, and the adjustment is not large, and it is not different. The NEDC energy consumption test method is to place the car on the rolling rack of the laboratory and simulate the urban area at an average speed of 18.5 km/h, and the average speed of the simulated suburb is 62 km/h.
A complete set of NEDC energy consumption tests, including 4 urban conditions and 1 simulated suburban condition. In addition, electrical equipment such as air conditioners, headlights and audio-visual equipment was turned off during the test. It is not difficult to find that the simulated driving conditions of NEDC are far from the actual driving environment. Not to mention whether to turn on the air conditioner and play music, the average speed of 18.5km/h in the urban area is not less than the sound of the horn, and there is also the sound of scolding. Therefore, the comprehensive mileage under NEDC conditions, I am afraid that a 20% discount is the real data.
NEDC working condition test is not accurate, so China Automobile Research Institute took the lead in organizing, investigating China's domestic road conditions, and formulating China's automobile driving conditions (CATC), of which CLTC is suitable for pure electric passenger car energy consumption test. Relatively speaking, the speed, frequency and environment of CLTC tests are more complex, but the comprehensive working conditions are not much different, and there is also a certain amount of moisture in the test data, which is about to be 90% off. The range of EPA and WLTP tests is closest to the real data, but unfortunately no manufacturer is willing to use it.
That is to say, no matter what brand of pure electric car you buy, the real mileage cannot reach the height of the manufacturer's publicity, but this is not the end.
Regardless of whether it is lithium iron carbonate or ternary lithium material, the battery energy will be affected by temperature, but the degree of attenuation is not the same. Batteries are like humans, the weather is hot to sweat, the weather is cold to shiver, this series of reactions will accelerate the body's internal consumption. Only at room temperature does the identity endocrine system function properly. Manufacturers have equipped an energy management system for the battery, but even if people blow cold air in the air-conditioned room, they cannot completely offset the impact of the heat on the body, otherwise your drinking water will be higher than that in spring and autumn.
In addition, driving in the summer is not allowed to blow an air conditioner, the road is far away can not play some music, mobile phones, tablets may also be plugged in USB charging. The activation of electrical equipment will accelerate the energy loss of the battery. One after another, the mileage will be at least 10% out. The most important thing is that whether it is to go to the surrounding counties and cities or cross-city travel, there is a high probability of running the highway, which just happens to point to the "death hole" of pure electric vehicles.
Anyone who has driven a fuel car knows that the fuel consumption is the lowest at high speed and the highest in the urban area, and the energy consumption of pure trams is just the opposite. The road conditions in the urban area are complex, and they are often stopped and flowing, resulting in inefficient operation of the internal combustion engine. Internal combustion engines with a maximum thermal efficiency of 40 percent may be less than 20 percent in urban environments. The internal combustion engine cannot be in an efficient working state, which will cause some waste of energy consumption and fuel consumption. The high speed is generally a smooth driving, the internal combustion engine operation efficiency is high, and the fuel consumption naturally comes down. The wind resistance that needs to be overcome at high speed is no longer important.
The motor efficiency of pure trams is almost unaffected by the speed, so it can maintain high efficiency operation in urban areas and high speeds, of course, there will be some slight differences in efficiency values. Pure trams drive on highways, and energy consumption is proportional to wind resistance. Fluid mechanics has said that the wind resistance is proportional to the square of the velocity. In other words, the faster the speed, the greater the wind resistance, and the natural power consumption is also greater. It's like a person running, wanting to be fast, and the legs must be more forceful. Make more strength, the consumption will be larger, and it will not take long to drink water to replenish energy. Of course, the highway may also be stop-and-go, but how long can the power be sustained?
There is no way to run at high speed, which is the "death hole" of pure electric vehicles. Even if there may be charging equipment along the way, charging efficiency, number of equipment and operation efficiency will greatly affect the energy storage experience of pure trams. All in all, to drive a pure tram self-driving tour, you must do a good job of charging strategies.
If you are too lazy to do it, either do not run far to play a tour around, or drink tea in the city (home) to cool off.