Hello, yes.
The 1.5GDIT engine independently developed by Great Wall Motors won the title of "Top Ten Engines" in the "Heart of China" annual top ten engine selection event, and has become a star in the industry. The 1.5GDIT engine uses real book data to show its superior performance and low fuel consumption, putting other engines to shame. There is no doubt about its powerful advantages, but it is not clear why it is so advanced and what technical problems it has overcome. Today we will talk about this topic.
The core technology highlight of the 1.5GDIT engine is the first domestic application of CVVL technology, which is the key factor that makes this engine so excellent. The self-designed CVVL technology was the result of Great Wall Motor's huge investment in research and development. It took five years to successfully develop the technology. It has applied for 39 patents for CVVL technology, making it the first independent brand to apply this technology.
CVVL is continuously variable valve lift technology. It is a high-precision technology in the industry. It is not cool to describe and is easy to understand. The traditional valve lift of traditional engines is fixed, but the operating conditions of the engine have different valve lift requirements. High-speed and large-load conditions require large valve lift and long duration, while low-speed and small-load conditions require small valve lift and short duration. The traditional valvetrain can only optimize the engine under certain working conditions and cannot satisfy all working conditions. CVVL technology solves this problem. It can adjust the valve lift size so that the engine can obtain the required valve lift in both high-speed and low-speed areas, thereby improving the engine's high-speed power and low-speed torque.
This CVVL technology, which is difficult to overcome, can intelligently control and adjust valve lift. So how is it implemented? The CVVL mechanism controls the lift through the eccentric shaft, adjusting arm, and connecting arm. First, the CVVL controller accurately controls the CVVL motor through the program. The CVVL motor drives the eccentric shaft to rotate through the worm gear and worm mechanism. When the eccentric shaft rotates clockwise, the adjusting arm pushes the middle swing arm to move to the left, and the lift becomes smaller. When the eccentric shaft rotates counterclockwise, the adjusting arm pushes the middle swing arm to move to the right, and the lift becomes larger.
CVVL technology brings many practical benefits to consumers, the most important of which is reduced fuel consumption. Because at small loads, lift control is used instead of throttle control, the throttling loss at the throttle is reduced, the intake pressure increases, the in-cylinder pressure is higher, the ventilation process consumes less work, and the pumping loss is reduced , engine models using CVVL technology can reduce fuel consumption by up to 8.4% (common working conditions on urban roads).
CVVL continuously variable valve lift control further reduces pumping loss based on dual VVT, and achieves intake flexibility control under different loads, making the engine power output higher. In the low-speed zone, the CVVL system suppresses air leakage by changing the intake valve overlap timing, and optimizes the intake valve closing timing and speed to increase engine torque; in the high-speed zone, it can extend the valve opening time to increase the intake air volume, thus Make power output higher. Of course, using CVVL technology, the engine responds more quickly and the emissions are cleaner.
In addition to being the first domestic application of CVVL technology, the 1.5GDIT engine also adopts a cylinder head integrated water-cooled exhaust manifold, overhead mid-mounted injector, electronically controlled supercharger, dual VVT and variable speed engine. Displacement oil pump and other technologies. This is why this engine can achieve such outstanding indicators as maximum torque of 285Nm, torque per liter of 187Nm/L, and comprehensive fuel consumption of 6.8L/100KM. The new Haval H6, the first to be equipped with 1.5GDIT, has market competitiveness that other products cannot match, opening a new chapter in Haval's history.