How are electric cars different from petrol cars?
Similar to a petrol engine, the power of an electric motor is also expressed in terms of power and torque. However, the operation of these two engines is not the same. Theoretically, the electric motor reaches peak power and torque at the moment of stepping on the gas, but with the petrol engine, the power only peaks if it reaches enough rpm.
To learn more about this difference, technology expert Bach Thanh Trung of vOz forum tested the VinFast VF e34 electric car with a Dynamometer (referred to as Dyno) – a device that measures power and torque at the wheel. This device will output parameters based on the vehicle’s performance in a simulated environment, which can indicate the actual speed of the vehicle achieved by the vehicle’s end drive at the wheel (which is very different from the actual vehicle speed). manufacturer’s engine parameters when measuring traction at the engine core), as well as knowing the most optimal engine rpm of the vehicle when shifting gears through the graph showing the results.
Electric vehicle capacity peaks at the moment of pedaling
VinFast VF e34 is being run on a Dyno machine.
The results of running on Dyno machine show that the maximum power of VinFast VF e34 at the wheel will be different in each Eco, Comfort and Sport modes, respectively 104 hp, 114-115 hp and 116.5 hp, respectively. . Thus, in Comfort and Sport modes, the car provides nearly equivalent power, but the feeling of the accelerator and steering wheel in Sport mode will be different, creating a sportier driving experience.
A special feature of the VF e34 electric car is that the power peaks at the moment of stepping on the gas pedal and maintains the peak power until it reaches the limited speed of 130km/h and then lowers. As for the gasoline engine, the power will increase slowly, peak and then lower.
The graph of the power and torque measurement results of the VF e34 on the Dyno machine.
Accordingly, the maximum torque of VinFast VF e34 reaches 590 Nm right at the speed range of 50 km/h in Sport mode. For Eco mode, this figure is 424 Nm. This maximum torque level is achieved immediately after stepping on the accelerator and gradually decreases when accelerating to the speed limit. This proves that the ability to accelerate from the first water of the electric car VF e34 is extremely strong. In terms of power, the VF e34 engine also peaks at a measured power of 116.5 hp immediately when the accelerator is pressed and stays that way until the speed limit is reached at 130 km/h.
This measurement result has a difference from the parameters announced by the manufacturer. Specifically, measured at the Dyno machine, the power is 31.5 hp lower and the torque is higher up to 248 Nm. According to expert Bach Thanh Trung, the measured maximum torque is many times higher than announced by the manufacturer because the figure of 242 Nm is measured in the electric motor, and at the wheel there will be a pair of reduction gears to help multiply higher torque.
As for the measured power loss of about 21.29%, although it is not large compared to models using internal combustion engines, it may still not be the actual number because the test conditions are not suitable. suitable for accurate peak power results. The powertrain of VinFast VF e34 is relatively streamlined, so the actual power loss is expected to be even more optimal.
VinFast VF e34 is suitable for urban operation
From the above results, expert Bach Thanh Trung concluded, VinFast VF e34 is not too strong in terms of power at the wheel, but this capacity is always ready at any time, stepping on the gas is immediately available. Therefore, the car feels stronger than the announced parameters. Torque is also instant and very strong. Even, the level of 590 Nm at the speed range of 50 km / h is only slightly less than the BMW M6 luxury sports car with 640 Nm of torque when measured with the same “running” Dyno base.
“With such parameters, the VF e34 is very suitable for urban driving, the speed is below 100 km/h. The car is strong and responds very well, not weak in any operating conditions. Over 100 km/h h, the car still has the force to accelerate straight to the limit of 130 km / h easily. But it should be noted, at this speed the battery drains very quickly, “said the expert.
In Sport mode, expert Bach Thanh Trung recommends that novice drivers be very careful because of very high levels of torque and power. At the time of receiving the car, the expert had stepped on the gas to test the engine power, so he encountered a wheel spin, then the anti-slip system had to intervene immediately.
Electric cars in general and VinFast VF e34 in particular also have the advantage of less heat generation. Any gasoline car model when “running” Dyno generates a lot of heat because the car is stationary and the engine is operating at full capacity. However, electric cars are the opposite. After “running” Dyno, the VinFast VF e34 engine compartment is still cool, some details are at a warm temperature, and others are still cold. To prove it, the expert put his hand in the engine compartment to test the temperature.
This is a remarkable advantage when the weather in Vietnam is often hot and sunny. The use of electric cars not only reduces harmful emissions into the environment, but also contributes to reducing urban heating, especially at off-hours in Hanoi and Ho Chi Minh City.
After nearly 4 months of being handed over to customers, VinFast VF e34 has gradually proven its strong performance, meeting most of the transportation needs while still saving fuel costs that are superior to cars. Petroleum. This is the foundation for electric cars to completely replace petrol cars soon become a reality.
at Blogtuan.info – Source: autopro.com.vn – Read the original article here
