Next, let's take a look at the "Star Core Power ET-i Full Engine Supermix" technology that does not change the soup, what are the technical highlights, and why it is called the most complex hybrid technology at present!
Dual motor drives are the capital of pride
First of all, this hybrid system still adopts the overall architecture of Chery Kunpeng DHT, which has the technical advantages of "3 engines, 3 gears, 9 modes and 11 speeds", but the core of the whole is the special gearbox for hybrid power, through the layout of the motor in different positions, so that a balance between performance and fuel consumption is achieved.
In addition to the traditional power source of the engine, the motor layout of "dual motor drive" is also adopted, of which the power parameter of the P2 motor is 55kW /160N·m, and the parameter of the P2.5 motor is 70kW /155N·m, which has a greater advantage in flexibility compared to geely's layout of only P2.5 drive motor. The four-wheel drive model will also be equipped with a P4 rear axle motor, thus forming a four-engine four-wheel drive power mode.
3-speed transmission is like the difference between ordinary bicycles and variable speed bicycles, 1 gear ratio setting is relatively large, mainly used for starting and accelerating; 3-speed ratio is relatively small, so that the vehicle speed and fuel consumption are at a low level, and can reduce noise. The emergence of the 2-speed ratio has played a role in carrying up and down, ensuring the smoothness of the gear change, while taking into account fuel consumption.
Due to the different working conditions, the Star Core Power ET-i full-engine supermix system can match the whole vehicle to achieve 9 working modes such as single motor pure electric, dual motor pure electric, engine direct drive, parallel drive, parking charging, and driving charging.
After matching different gears, it can be found that its overall gear combination is as many as dozens of types, and the engineers of Xingtu have selected gear combinations that can cover all car scenes, including starting, low and medium speed, elevated, overtaking, red light, congestion, high speed, long distance, mountain road, high speed steering, ice/mud/sand and other 11 car scenes.
Matching the driving conditions is key
The Starway Hybrid system uses a system architecture of one engine + P2, P2.5 motor + 3-speed dual-clutch transmission, in which the P2.5 motor and Geely's Ray God Engine Hi · The X-hybrid system is somewhat similar, but its position moves from an even-numbered axis on a dual-clutch transmission to an odd-numbered axis. Its complex working mode is as follows:
After such a combination of arrangements, all of its gear combinations are as many as 29, but the engineers only choose 11 driving conditions for intelligent switching, which has already met the daily car use scenario.
1
For example, in the initial stage, due to the lowest thermal efficiency of the engine and the largest energy consumption, in this stage, the pure electric drive of the dual motor is used;
2
When no particularly large torque is required at medium and low speeds, the system automatically selects one of the single motors for drive, which consumes less energy than the start-up phase.
3
When driving on the elevated road, the three-engine parallel mode is used during the overtaking process of medium and high speed to ensure sufficient power output.
4
The high-speed stage of the engine has reached its optimal thermal efficiency range, using the engine direct drive mode of driving, the overall fuel economy will be more excellent, excess energy can also be driven back-drag motor power generation, charging the battery.
Performance trade-offs with fuel consumption
The Weipai Machiduo DHT-PHEV special edition model is equipped with a 1.5L hybrid special engine + DHT100 powertrain, the system comprehensive power is 197kW, the acceleration of 100 kilometers is 7.2s, and the official comprehensive fuel consumption is 4.4L/100km.
From this, it can be seen that the StarWay Wind Chasing ET-i is taking the performance-oriented route, due to the addition of the dual-drive motor, there is a greater advantage in the acceleration of 100 kilometers, which is matched with a battery pack of 19.27kWh, with a pure electric driving range of 105km, and by matching different working modes, the comprehensive driving range exceeds 1000km.
In addition, the subsequent four-wheel drive version of the model, due to the addition of the P4 motor, the total power reached 338kW, the maximum wheel side torque exceeded 6300N·m, and the acceleration time of 100 kilometers will enter within 5 seconds.
How to solve the pain points of hybrid models?
I believe that when you take a pure electric vehicle, you can more or less hear some motors produce high-frequency acoustic noises, which are mainly caused by the harmonics of the inverter output. Dr. Zhou Zhiguang of Xingtu Brand said that first of all, starting from the design of the motor, through the optimization of the rotor, to avoid the emergence of abrupt sounds; the gear adopts high-precision gear design technology to control the backlash at a higher level, so as to avoid the occurrence of whistles and knocks in pure electric driving.
Another is the abruptness of the hybrid model when the engine is involved, and Xingtu Automobile has carried out refined development and calibration for the sliding start of the clutch, and adjusted different engine starting torques according to different temperatures, thereby improving the noise when the engine intervenes.
In addition, because this hybrid system adopts the architecture of a 3-speed dual-clutch transmission, how to improve the setback when changing gears is also the key to improving the quality of driving. First of all, the control of the shift point is very important, and it is necessary to choose a moderate engine speed for shifting, so as to ensure the smooth power output and the sound of the engine before and after the shift is basically the same.
The Star Core Power ET-i Full Engine Supermix System also uses TSD dual-shaft drive technology to ensure that there is no power interruption and power loss during the shifting process, and the overall torque before and after the shift does not undergo a large jump, thus ensuring the smoothness of the shift.
In terms of motors, ultra-high-density I-PIN flat wire motors, combined tooth surface two-way processing, low-towing clutch, high-efficiency oil pumps, main oil pressure following strategies and other technical measures are also used, making the maximum transmission efficiency of the system exceed 97.6%.
As for why you chose dual motor drive? Because the overall flexibility is higher than that of high-power single-motor drives, the energy conversion efficiency of single-motor drives will be higher when driving at low speeds. In addition, due to the position layout of multiple motors, the strength and accuracy of each component are reduced, which greatly reduces the manufacturing and research and development costs.
Summary of the full text
Star core power ET-i full engine supermix technology, compared with other hybrid systems, the overall structure is not particularly complex, and its biggest difficulty lies in the control and matching of the working mode. However, the adaptive power mode of the whole road condition also happens to be its highlight, coupled with the advantages in terms of power, I believe that there is still a strong sense of existence in the field of hybrids, but this depends on the position of "technology" in the consumer's heart. (Text: Pacific Auto Network Yayong)