On the road to the new energy era, hybrid vehicles are an excellent intermediate solution. They can not only effectively reduce fuel consumption, but also avoid some of the disadvantages of current pure electric vehicles. However, hybrid technology has been dominated by Japanese car companies. So far, the hybrid models sold by the Toyota brand in China have accounted for about 15%, of which models such as the Avalon can even reach as high as 30%. Because of the very high technical barriers and patent protection, even among European and American car companies, there are only a few who can break through.
On December 15, Great Wall Motors’ lemon hybrid DHT made its global debut. This is a breakthrough for independent brands to monopolize hybrid technology. China's goal is to reduce average fuel consumption to 4L/100km by 2025. Without the support of hybrid technology, this is very difficult to achieve. Great Wall's breakthrough this time is of great significance.
01?High speed has more advantages
Currently, there are two major schools in the hybrid industry. One is Toyota’s planetary gear set series structure, and the universal hybrid system is also of this school. The other is One is Honda's parallel structure. This time Great Wall Motor's hybrid belongs to the latter faction. The advantages and disadvantages of Toyota's planetary gear set structure are obvious. The advantage is that if the driver drives within the optimal speed range of this system, its transmission efficiency and fuel saving are very high. The disadvantage is that when the vehicle reaches high speed, the efficiency and power of this system are greatly reduced.
Great Wall's hybrid system can give drivers a very good power feel and relatively high transmission efficiency at high speeds. This system is currently matched with three different specifications of powertrains. Under the two architectures of HEV/PHEV, there are "1.5L?+DHT100" and "1.5T?+DHT130" powertrains. Under the PHEV architecture, there is also a "1.5T+DHT13P4" four-drive powertrain.
The HEV two-wheel drive system has a maximum power system power of 180kW, and the total power of the PHEV two-wheel drive system can reach 240kW. The HEV architecture uses a 1.8kWh battery, which increases the battery capacity by more than 30% compared to traditional hybrid systems. The PHEV architecture is equipped with a 45kWh battery that can be charged to 80% in 30 minutes. It currently provides an 8-year/150,000-kilometer warranty. The PHEV+P4 structure's front and rear axle motors can output power at the same time, and the maximum total system power can reach 320kW.
02? Four operating modes
Like Toyota and Honda's hybrid systems, Great Wall's system is roughly divided into four operating states.
EV mode energy flow: In EV working mode, the TM motor can directly drive the wheels, keeping the engine in a high-efficiency area and maximizing power performance.
Series mode energy flow: Series mode is suitable for urban driving conditions. The engine drives the GM to generate electricity, and the TM motor directly drives the wheels. In series hybrid mode, the fuel saving rate can reach 35%-50% %.
Parallel mode energy flow: High-speed driving conditions are more suitable for parallel mode. It is driven by the engine to directly drive the wheels. The GM motor and TM motor are responsible for adjusting the engine operating point and auxiliary driving wheels. This kind of engine is directly driven. By placing the working point directly in the high-efficiency area, fuel consumption can be reduced by 10% to 15% compared to the series mode.
Energy recovery mode energy flow: The energy recovery mode is suitable for braking conditions. The TM motor directly recovers energy, which not only improves the working efficiency of the vehicle and increases the cruising range, but also further reduces fuel consumption, thus better Optimize energy usage.
The release of Great Wall Motor's hybrid power system represents a technological breakthrough for its own brand. Prior to this, except for the hybrid systems of the Japanese Toyota and Honda, only the general-purpose hybrid system could stand at this level. The release of the Lemon DHT hybrid system is a major step forward for Great Wall Motors on behalf of Chinese car companies.
This article comes from the author of Autohome Chejiahao and does not represent the views and positions of Autohome.