New closed cylinder technology saves engine fuel economy by 20%

In the early days of automobile development, people were keen on increasing displacement and boosting horsepower in order to improve vehicle performance. With the economic crisis and energy shortage, people began to realize the importance of energy saving and emission reduction. Closed-cylinder technology has found a balance between energy saving and power. Today, the mechanical front line tells everyone about the engine variable displacement technology, commonly known as engine closed cylinder technology.

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Closed cylinder variable displacement technology

The application of driving computer control technology to adjust the number of cylinders of the engine to open and close, to stop the oil supply and close the valve, reduce the number of cylinders working in the engine, thereby improving the fuel economy of the vehicle and reducing the energy consumption.

V8 engine closed side valve open

History of closed cylinder technology

The first application of the closed cylinder technology was the Cadillac engine with the L62 V8-6-4. The technical name was DoD (Displacement on Demand), and the V-type engine could be changed from 8-cylinder to 6-cylinder or 4-cylinder. In the mode, the fuel saving effect is obvious, and the technical limitations at that time were stranded.

Cadillac L62 V8-6-4 engine

With the recognition of the closed-cell energy-saving concept, many auto manufacturers have begun to develop their own closed-cylinder technology. Mitsubishi's MD, Chrysler's MDS, Honda's VCM, Volkswagen's ACT, etc. have all launched their own closed-cylinder engines. Let us talk about the principle of closed cylinder engine.

Principle of closed cylinder engine

OHV tappet separation

Everyone knows that the United States is popular with muscle cars. For muscle cars with low rotational speed requirements, OHV bottom camshaft technology is widely used. Many Chrysler HEMI 5.7L engines use MDS technology. The ECU controls the hydraulic system and pushes the bayonet through the hydraulic system. The bayonet can make the tappet integral and push the valve.

Chrysler MDS tappet separation

Valve lift improvement

Valve lift technology is no secret to most automakers. By improving the valve lift technology, the valve closing can be achieved and the cylinder closing effect can be achieved. For example, Volkswagen's ACT, the main model is the EA211, and the in-line four-cylinder with a displacement of 1.4L TSI realizes the opening and closing of the cylinder through the movement of the camshaft. Its essence and valve lift are a principle.

Volkswagen's ACT, the main model is EA211, and the in-line four-cylinder with a displacement of 1.4L TSI

Connecting rod rocker synchronization and separation

Honda's VCM (Variable Cylinder Management) variable cylinder management, the main model is the J series engine, the application model is part of the eighth generation Accord. Many Honda V6 3.5L engines are now equipped with closed cylinder technology.

The ECU controls the hydraulic system, and the hydraulic system is combined with the rocker link to make it integrated, thereby controlling the valve opening and closing.

Valve separation

Since the OHV bottom camshaft can separate the tappet and the rocker link can be separated, why can the valve stem not be separated? Bosch's closed cylinder technology separates and combines the valve stem through the hydraulic system to realize the valve Opening and closing.

Bosch valves are separated and combined to achieve valve opening and closing

Closed-cylinder model

Coming soon to the new Audi A3/S3 model, 4 cylinders to 2 cylinders, Audi's siege lion brain is large enough; Lamborghini officially announced the launch of the new Huracan LP 610-4, the biggest highlight of the new car is its 5.2L V10 engine The closed-cylinder technology is adopted; the overseas ATS and CTS are equipped with a 3.5L V6 engine with start-stop technology and closed cylinder technology; Chrysler HEMI 5.7L engine with MDS technology, engine with closed cylinder technology; Honda eighth generation Accord 3.5 L V6 engine with closed cylinder technology, Honda's poetry and so on.

Chrysler HEMI Grand Cherokee

Eight generations of Accord equipped with 3.5L V6 engine

Summary: To open and close the valve of the closed cylinder technology, it is nothing more than making a fuss about the valve train (camshaft, valve stem, valve). The above is a classic four mechanical closed cylinder structure. With the development of electronic technology, electronically controlled valves will replace these mechanical structures in the future.

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