On October 13th, the “China Heart†2016 New Energy Vehicle Power System was selected for the real vehicle test. The reporter interviewed the experts of the on-site jury. On the one hand, experts have affirmed the progress made by new energy auto companies in power system matching and vehicle assembly technology over the past five years; on the other hand, they have proposed six specific problems related to vehicle power systems. It is the main direction of the company's future product improvement.
Question 1: Battery placement takes up too much space
At the beginning of the evaluation of the first car, Hou Fushen, deputy secretary-general of the China Automotive Engineering Society, did not go to the front of the car, but stopped at the side of the car, squatting down and carefully observing the bottom of the car. “A lot of electric vehicles are directly transformed on traditional cars, and the whole battery is placed on the bottom of the car. The huge battery will occupy the space inside the car, causing the rear passengers to collapse in a sitting position, which is half-turned. If the car company adjusts the shape of the battery , the alien design, you can improve the space." Hou Fushen told reporters.
Question 2: Battery protection design is at risk
As the core component of the new energy vehicle power system, the battery's protective performance is also a key concern of the judges. One of the key indicators of this evaluation is whether the battery full seal design protection level is greater than IP65, and whether it has anti-collision design.
"Some car companies failed to achieve the integrated design of the battery, just put the battery in the bottom of the traditional car chassis, battery protection and air resistance and other issues are not considered enough." Associate Professor of Automotive Engineering Department of Tsinghua University, Vice President of the China-US Clean Automobile Alliance Director Wang Hewu mentioned that the battery is suspended in the middle of the chassis, and some models are more prominent, and there is a risk of directly smashing the ground.
Question 3: Brake energy recovery effect needs to be improved
Wang Hewu analyzed after the test drive that the braking energy recovery technology has a greater impact on the vehicle energy consumption index, which is related to the driving comfort of the vehicle. In actual driving, the effect of braking energy feedback technology of each vehicle is quite different.
“The braking energy recovery effect of individual models is not obvious, indicating that the energy recovery system has low working efficiency and should be improved as soon as possible.†Jiang Jiuchun, a professor at the School of Electrical Engineering of Beijing Jiaotong University, told reporters.
Problem 4: Low integration of powertrain components
In the static evaluation of the new energy power system, one of the most concerned issues of the judges is the layout of the space in the front engine compartment, which directly reflects the integration ability of the vehicle manufacturers, and the placement of various components of the power system of individual models is relatively messy. Not well designed and combed.
Zhou Rong, chief engineer of the Automotive Standardization Research Institute of China Automotive Technology and Research Center, believes that the high-integration new energy power system will perform very well in terms of reliability. Strengthening the integration of components such as electronic control, motor and reducer is an enterprise effort. direction.
Question 5: Low-speed creeping is frustrating and not smooth enough
The vehicles participating in the real vehicle test showed poor overall performance at low speed. Wang Hewu criticized: "When some electric vehicles are in low-speed creeping state or reversing, there is still a significant sense of frustration, indicating that the company's research on vehicle motor control systems is not deep enough, and data accumulation is not much, and it needs to continue to improve and improve."
Question 6: There is a gap in the assembly process of the vehicle
Vehicles that have been tested by real vehicles, after receiving various subsidies, can still sell for more than 100,000 yuan, but some of the vehicle manufacturing processes and driving quality are far from the traditional power cars at the price level, braking system performance, and some parts. The installation process should continue to improve, especially in terms of driving noise suppression.
Yin Chengliang, deputy dean of the Automotive Research Institute of Shanghai Jiaotong University, believes that these vehicles have made great progress in suppressing the noise and noise of the motor current, but there is still much room for improvement in the level of the whole vehicle, and it is the driver’s experience to provide a comfortable driving experience. The key to consumer recognition.
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