2025 comprehensive mixing reveals the inside story of Qilang Power.
[car home Engine Technology] At this year’s Beijing Auto Show, GAC Chuanqi officially released Julang Power Platform, and the powertrain derived from this platform will become the most important part of the core competitiveness of Chuanqi brand new models. When it comes to Julang Power, it includes not only the traditional fuel engine, but also the special hybrid engine, the traditional gearbox and the hybrid gearbox. In order to find out more about Julang Power, I visited Dr. Qi Hongzhong, Deputy Director of Power Center of Guangzhou Automobile Research Institute. What is the technical inside story of Julang Power? Let’s take a closer look!
In this article, you will see:
1. Introduction of Julang Power Product Line
2. Current performance level of Julang Power Products
3. Secret of the latest hybrid system technology of Julang Power
● The goal of giant wave power
The inspiration of "Julang" in Julang Power comes from the word "Julang", which well explains the development goal of Julang Power-that is, to provide users with surging and endless power like huge waves.
In order to meet the increasingly stringent emission regulations and provide customers with better fuel economy, it is necessary to upgrade the thermal efficiency and emissions, so that the engine can achieve a better balance in various comprehensive performances.
The goal of GAC Chuanqi is to electrify all models in 2025.The so-called electrification simply means mixing. To achieve this goal, hybrid powertrain is an extremely important technical reserve.
● List of product lines derived from Julang Power
The first generation engine of GAC Chuanqi was imported from Fiat’s technology. The second generation engine is independently developed. With the technical accumulation of the first and second generation products, GAC Chuanqi has mastered the core technology, and by the third generation products, an engine platform with two displacements of 1.5L and 2.0L has been formed.
As for the gearbox, as an externally introduced resource,The 6AT and 8AT automatic manual transmissions from Aisin will continue to be used. The self-developed 7-speed WDCT wet dual-clutch gearbox will derive a low-torque version with a maximum bearing torque of 300 Nm and a high-torque version with a maximum bearing torque of 400 Nm.To match the traditional fuel engine in Julang Power product series. This gearbox won the title of Top Ten in the third "Top Ten Transmissions in the World" of "Longpan Cup" sponsored by Automotive Evaluation and Research Institute.
In terms of transmission efficiency, engineers comprehensively optimized each efficiency loss point by adopting more efficient bearing scheme, better lightweight design, better gear box oil stirring design and electronic pump+mechanical pump mixed oil supply system, thus improving the transmission efficiency of the gearbox to the international leading level.
For example, the shift oil circuit of electro-hydraulic control module is optimized in hardware, and the excellent shift comfort is finally achieved by designing intelligent adaptive software control strategy and fine calibration of shift performance for different matching vehicles in software. From the current practical experience, the shifting performance of the 7-speed WDCT wet dual-clutch gearbox of GAC Chuanqi has reached the level of the traditional 6AT gearbox, and even some performance parameters are more advantageous.This WDCT wet dual clutch gearbox will be further technically iterated, and it is expected to be upgraded from 7th gear to 9th gear in the future., further improve the transmission ratio range and optimize transmission efficiency, thus improving the fuel economy level of powertrain.
For large-size vehicles, the current G-MC dual-motor system can cover them, but for performance-oriented vehicles, the system will give users a weak dynamic feeling. To this end, GAC will introduce other technical solutions to meet the needs of customers in the future.The manufacturing cost of dual-motor hybrid power system is a crucial issue.This is true for Honda and Toyota, and it is also true for GAC Chuanqi. In order to meet the needs of small-scale and low-cost vehicles,Guangzhou Automobile Chuanqi may develop a single-motor hybrid system with special configuration in the future.. The lower manufacturing cost will give the new model stronger price competitiveness.
● The difference between hybrid special engine and traditional fuel engine.
The hybrid engine is mentioned above. What is the difference between this engine and the traditional fuel engine? What are the difficulties in development? This should be a problem that most netizens are very concerned about.
In addition to some hardware differences that can be seen on the surface, the control strategy of hybrid special engine is very different from that of traditional fuel engine.
Academically, we call this practice the transformation from area working condition to area working condition or even point working condition. To put it in a better language,Let the engine work in a specific speed and torque output area or working point with particularly high thermal efficiency.Thus contribute to that low fuel consumption property of the hybrid system.As for the power and performance-related parts, they are reinforced by the motor..GAC Chuanqi’s practice is actually moving closer to Toyota’s hybrid thinking, but it will pay more attention to the balance between power and fuel economy.Instead of Toyota’s preference for fuel economy.
● Thermal efficiency is called Mazda Chuangchi Blue Sky X?
In terms of the highest thermal efficiency of the engine, the thermal efficiency of Chuanqi 2.0L Atkinson cycle hybrid special engine of 42.1% is already outstanding, but it does not exceed the thermal efficiency of Mazda 2.0L Chuangchi Blue Sky X engine of 43%. However, we can’t ignore that this engine of Chuanqi is a special engine for hybrid power. According to the test data, this engine will work in the working range of 42.1% thermal efficiency for more than 90% of the time under daily driving conditions, so as to keep the fuel consumption level of the vehicle low.
In fact, GAC Chuanqi has also studied the compression ignition engine like Mazda Chuangchi Blue Sky X, and the effect of compression ignition on improving thermal efficiency is very obvious.
For GAC Chuanqi, the cost of compression ignition engine is too high, but the improvement of fuel saving rate is limited.Considering the input-output ratio comprehensively, GAC Chuanqi chose the technical route of hybrid power..