What Means CGI Mercedes – Pros And Cons Of It

As the problem of reducing automobile emissions becomes increasingly urgent, car brands are constantly coming up with new technologies to solve this problem.

In particular, CGI Mercedes is one of the pioneer names in this field.

So what means CGI Mercedes? Scroll down and get the answer.

What Means CGI Mercedes?

what means cgi mercedes
Mercedes CGI Price

During the years of development, every time Mercedes launches a new car line, its “name” always makes customers curious and excited.

CGI stands for Charged Gasoline Injection or direct-injection petrol engine.

It directly injects fuel into the engine combustion chamber instead of right at the intake port like a manifold injection system.

It limits deposits on the intake pipe right in front of the valve, helping to increase operating capacity, reduce emissions, and save fuel.

In 1954, Mercedes first applied this technology to the legendary 300 SL Coupe, but it did not receive the attention of the automotive industry at the time.

However, with pressure on emission standards, the problem of maximizing fuel efficiency is becoming more and more acute.

Not giving up, this company constantly improves and perfects its structure and operating principles to achieve the highest efficiency.

In 2002, the next model using CGI technology was born, and this time their 1.8-liter engine quickly resonated in the market.

This system is becoming increasingly popular and expanding its operations to the Canadian market and Japanese market. Currently, it is present in most modern cars.

How Does The Mercedes CGI Engine Work?

Simply put, this system pours fuel directly from the injectors at the vehicle’s intake port (fuel injection port) into the combustion process chamber without a lean mixture of it with air and threading it around the intake valve.

Its operating principle is similar to that of a diesel engine, but the main difference lies in the electric spark to ignite the carburetor and includes 2 main charging modes.

The cascaded loading mode is used in small and medium loads. The system injects fuel into the compression stroke close to the ignition timing.

Only a small amount of fuel is concentrated right in front of the spark plug, but the amount of NOx (NO, N2O, NO2, N2O3, etc.) is so large that the EGR valve will increase in time to reduce the NOx concentration.

In heavy load mode, the fuel in the intake stroke helps the carburetor achieve uniformity.

The engine operates with a slightly rich or balanced carburetor; the EGR valve does not work because the NOx ratio is low.

CGI determines the intake mode based on the air-to-air ratio. The vehicle’s black box selects the appropriate way to create stability in engine operation.

What Are The Advantages Of A Direct Fuel Injection Engine? 

what does blue efficiency mean on mercedes
Advantages Of A Direct Fuel Injection Engine

Fuel Economy

Thanks to the two basic intake modes, the air-to-air ratio in the uniform intake mode can reach the ideal threshold of 14.7:1 and is thinner in the stratified intake mode of about 65:1.

Along with that is the combination of ultra-precise computer management to help the system better control the fuel injection.

It is the amount of fuel injected and the time of injection, the point of receiving energy when inserted into the cylinder.

The position of the injectors also allows for a more optimal injection pattern that breaks down the gasoline into smaller droplets.

The result is a complete combustion process. In other words, more gasoline is burned, resulting in more power.

CGI Mercedes helps save up to 15% fuel compared to other fuel injection systems.

Power Increase

The CGI betters a 10% higher compression ratio than gasoline-injected engines of the same capacity.

When the compression ratio increases, the compression pressure of the machine also increases, helping the car operate more powerfully.

When the engine operates at a high load, the fuel enters the intake stroke to create a mixture formation.

More energy is introduced, combined with the incoming air intake, to help the fuel and air mixture mix more evenly.

Burning more carburetors increases the engine speeds, which is suitable for high-load operation. This brings to drivers superior driving experience.

Reducing Emissions Causing Environmental Pollution

The actual operation of vehicles equipped with the direct-injection petrol engine shows that the A/F ratio in the uniform charging mode is very balanced, and the amount of NOx emissions released into the environment is also low.

In the cascaded intake mode, NOx appeared more, but the timely activation of the EGR exhaust gas recirculation valve helped reduce this harmful emission.

From 1970 to now, the European Union and North America have adopted 6 strict emission standards to reduce the burden of automobile emissions on the environment.

This advantage is an extremely effective solution for many car manufacturers.

What Are Mercedes CGI Problems?

mercedes cgi problems
Mercedes CGI Issue

Besides the outstanding advantages, the direct-injection petrol engine also has some disadvantages, such as:

Accumulation Of Dirt On The Intake Valve Surface

Because the CGI system works on injecting fuel directly into the combustion chamber, not through the intake valve, the intake valve is closed with carbon deposits after about 90,000 – 100,000 km of use.

Long-term accumulation of dirt causes compressed air leaks and affects engine power. The carbon deposit on the intake valve also restricts the airflow, reducing the vehicle’s power when traveling at high speeds.

This thick deposit in the system will cause fuel consumption, which breaks its original purpose of fuel saving.

In the case of an engine that uses a turbocharger, carbon deposits can damage the turbine blades of that unit.

High Repair And Maintenance Costs

The CGI structure is quite complex, requiring more high-pressure pumps than traditional petrol engines, so the maintenance process is also more complicated.

Replacing assembly components is also expensive and requires highly qualified technicians.

Because of the more complex structure, the installation of this system also puts more pressure on the cost of the vehicle. It’s not an outstanding economy four-wheel drive.

Although it is becoming increasingly popular, most manufacturers only use it for the high-end segment, luxury automotive like C300 luxury sedan, C-Class Coupé Sport, etc.

They are constantly researching and looking for solutions to overcome these disadvantages.

What Does Blue Efficiency Mean On Mercedes?   

CDI BlueEFFiCIENCY (abbreviated as BE) is a Mercedes-Benz technology that makes cars more environmentally friendly. A vehicle with this technology consumes less fuel and emits less CO2.

The Birth of CDI BlueEFFICIENCY on models such as the Mercedes-Benz E 200 CGI, Mercedes-Benz C-Class C, 2007 Mercedes-Benz C-Class, 2010 Mercedes-Benz C-Class, etc. offers great performance.

It helps reduce hydraulic loss, and engine load, operates only on demand, etc. It also converts the kinetic energy of the motor into a reusable form.


Above is the information about the question: what means CGI Mercedes?

Hopefully, with our sharing above, readers will understand more about it before deciding whether to buy a car using this technology.

Thanks for reading, and see you in the next articles.

Leave a Comment