Excuse me, what is the common meaning of Ecotec DVVT technology for automobile engines?

The predecessor of Ecotec engine was developed and produced by Opel and its subsidiaries. By 2000, GM had assembled excellent global engineering and technical forces such as its power department, Horton Company and Opel R&D organization, and completed large-scale research and development of the four-cylinder "global engine" series, which was named Ecotec engine and produced by major powertrain plants around the world.

DVVT engine is the most competitive new mainstream based on VVT engine technology, which has been used in high-end models such as BMW 325DVVT. Although the principle adopted by DVVT engine is similar to that of VVT engine, VVT engine can only adjust intake valve, while DVVT engine can adjust intake valve and exhaust valve at the same time. DVVT can also realize continuous linear adjustment of valve phase within a certain angular range according to different engine speeds, and has excellent characteristics of low speed, high torque, high speed and high power.

Technical details of VVT electronic dual-valve variable intake and exhaust timing system;

Both the intake valve and the exhaust valve adopt a continuously variable timing system, which is the most advanced form of this technology and the most commendable place of the LaCrosse engine.

At present, there are two methods to adjust the valve variable timing system: one is to adjust the "breathing" amount by adjusting the opening and closing time of the valve; The other is to change the intake air flow per unit time by adjusting the valve stroke. The former is represented by Camry VVT-i engine, while the latter is represented by Accord i-VTEC engine. Technically, the Accord's variable valve stroke is slightly better.

However, due to the intervention of multi-rocker arm and cam group mechanism, the valve distribution system of Accord engine is relatively complicated, the running noise is high, and the maintenance cost is greatly increased. LaCrosse Ecotec? Engine engine adopts the principle similar to Camry, and uses a relatively simple hydraulic cam system to realize its function. The difference is that Camry and Accord engines can only adjust the intake valve, while LaCrosse engine can adjust the intake valve and exhaust valve at the same time. Technically, it is at an absolute leading level.

It is worth mentioning that LaCrosse Ecotec? The engine can output 90% torque between 1800-5800 rpm, especially when starting, overtaking and changing lanes. Because of the increase of low and medium speed torque output, the driving maneuverability is greatly enhanced and the response time of the engine is greatly improved. At high speed, the horsepower is high and the power is continuous, which makes the driver full of confidence.

Double counter-rotating balance shaft

LaCrosse Ecotec? The two balance shafts of the engine run at twice the speed of the crankshaft to eliminate inertial vibration. It counteracts the reciprocating inertial vertical vibration generated when the in-line four-cylinder engine is running, and provides excellent noise reduction and shock absorption characteristics. The design ensures the smooth running of the engine, and then achieves the ride comfort of V6 engine.

Author's point of view: In fact, I think every variable timing system has its advantages, and each family is updating its own timing technology, such as Toyota's double YYT-i technology. However, Volkswagen and GM, which can balance high and low torque output at present, are doing well. I hope it helps you!