Fuel consumption analysis of petrol and diesel engines

gasoline engine fuel consumption graph
gasoline engine fuel consumption graph

It can be seen from the gasoline engine fuel consumption graph that the fuel consumption of the engine is the lowest in the range of 2000rpm, 150NM–250NM. This range has the best fuel economy, and the engine burns the most fuel efficiently. At 1000rpm~4000rpm, the fuel consumption is relatively high in the area of 20NM~100NM. That is, the fuel economy is poor, and the combustion efficiency of the engine is very low. The fundamental reason is that gasoline flame spreads slowly. This results in incomplete gasoline combustion during engine acceleration and under heavy loads. Therefore, an area of low combustion efficiency is formed. The car is in this condition most of the time, so the fuel consumption is also relatively high.

fuel consumption chart for a diesel engine
fuel consumption chart for a diesel engine

This is a fuel consumption chart for a diesel engine. The working condition with the lowest fuel consumption of the vehicle is 1400rpm, 500NM–600NM, and the fuel consumption is 195. The truck is often in the working condition of 2000rpm–2200rpm, 500NM–700NM, and the fuel consumption is 220 at this time. This is because the fuel burns for different lengths of time inside the engine. Moreover, under heavy load conditions, the engine needs to inject enough fuel, which makes the engine more fuel-injected and shortens the combustion time, resulting in lower fuel combustion efficiency and lower fuel economy. To put it simply, whether it is a gasoline engine or a diesel engine, under normal driving conditions, the engine will inject more fuel for a long time, and the fuel combustion time will be shortened, resulting in a decrease in fuel combustion efficiency. Fuel consumption will inevitably increase. The most fundamental reason is that the flame propagation speed of fuel oil is relatively slow, and it is difficult to fully burn all the fuel oil in a very short combustion time. Some of the unburned fuel will be exhausted with the exhaust, resulting in reduced fuel economy and increased exhaust hazards.

The characteristics of hydrogen and how hydrogen can support the combustion of gasoline/diesel.

The flame propagation speed of hydrogen is 8 times that of gasoline. The flame of hydrogen can ignite all the gasoline injected into the engine in a very short time and support the combustion of gasoline. This improves the combustion efficiency of the engine. Make the fuel burn fully, provide more energy and improve fuel economy. Hydrogen enters the engine together with the air, and it plays a combustion-supporting effect on the fuel, rather than replacing the fuel or substituting part of the fuel.

How to produce hydrogen

There are two ways to generate hydrogen gas to aid combustion in the car in real time. The first method uses an alkaline hydrogen generator to electrolyze water to produce hydrogen and oxygen gas. Used sing stainless steel as the electrodes, KOH or NaOH is added to the water as a catalyst, and 12V, 5A~20A of electricity is ufor electrolysis, which consumes 60W–200W of power to produce hydrogen gas. This is a big burden for the car’s generator, and the hydrogen gas produced by the electrolyzer containing KOH and NaOH has corrosivity, which can cause damage to the engine. The second method is a PEM pure water hydrogen generator, using a proton membrane and iridium oxide layer as catalysts, without the need to add alkaline or acidic catalysts, just adding pure water is enough. The hydrogen and oxygen gas produced by electrolysis is very clean and does not harm the engine(PEM electrolyzer VS Alkaline electrolyzer). It requires 2V-4V, 5A-15A of power and consumes 10W–60W of power to produce hydrogen and oxygen, without extra burden to the car’s generator. The only downside is that it is more expensive. After 8 years of testing and comparison, we have finally chosen a PEM pure water electrolytic cell to produce hydrogen gas.

How much hydrogen do we need

This is the most contradictory point in the whole product concept. The electricity for electrolysis to produce hydrogen comes from the engine, the more hydrogen produced, the greater the electricity consumed, which increases the burden of the generator, thus increasing the fuel consumption of the engine. In addition, the large amount of hydrogen produced entering the engine may increase the thermal load of the engine and aggravate the thermal fatigue of the engine, which is also unfavorable.
With less hydrogen, less electricity is consumed and the burden of the generator is not increased. Moreover, a small amount of hydrogen is very safe and will not cause combustion or increase the thermal load of the engine. However, using a small amount of hydrogen to assist combustion of the engine fuel has little effect.
Our SENZA hydrogen truck kit uses a microchip algorithm control + a small amount of hydrogen to assist combustion of the engine. A small amount of hydrogen is injected into the engine, and due to the fast flame propagation speed of hydrogen, fuel can be assisted in combustion in a very short time. In addition, with high-precision and accurate control of the engine ECU, parameters such as injection timing and ignition timing are optimized in real time, which not only can maximize the combustion effect of hydrogen in the engine cylinder, but also fully ensure safety and stability. Therefore, we use the method of microchip program control and hydrogen injection. The configuration of hydrogen for small cars is 100ml/min-300ml/min; The configuration of hydrogen for trucks and large trucks is 150ml/min-1000ml/min, according to different displacements configure different amounts of hydrogen.

Composition and function of SENZA hydrogen truck kit

Hydrogen truck kit
Hydrogen truck kit
  • Microcomputer: The microcomputer optimizes important parameters such as the fuel injection timing and ignition timing of the engine in real time according to the amount of hydrogen, so that the hydrogen can maximize the combustion-supporting effect.
  • PEM Electrolyzer: The electrolyzer electrolyzes pure water into hydrogen and oxygen.
  • Transformer: Convert 12V/24V voltage into 5V voltage to provide power to the hydrogen electrolyzer.
  • Water tank: store pure water.
  • Water and gas separation bottle: filter and purify the water in the hydrogen and oxygen produced by electrolysis
  • Water pump: pressurize pure water to supply the electrolyzer
  • Water level sensor: detect the water volume of the water tank
  • Vibration sensor: When the engine is started, the hydrogen production equipment is also started

How much better fuel economy can be improved after installing a hydrogen truck kit

According to our actual tests on trucks of different brands, models, and years, there will be a 10%-18% increase in fuel economy.The truck is a FAW JieFang heavy-duty semi-trailer with a displacement of 11.05 liters and 460 horsepower. We conduct a same distance, same section, same driver,150KM driving test.

Firts test

We don’t install anything. Let the truck run 150.9KM
Average MPG : 33.5L/100KM
Consumption : 50.9L
Mileage : 150.9KM

truck first test
truck first test

Second test

We installed the senza hydrogen truck kit. and then ran the truck for the same distance.
Average MPG : 27.8L/100KM
Consumption : 42.0L
Mileage : 150.6KM

second test
second test

Test results

Average MPG :

First : 33.5L/100KM
Second : 27.8L/100KM

Consumption :

First : 50.9L
Second : 42L

Fuel economy improved by 17.1%
After our many tests, we found that the trucks using the hydrogen truck kit can improve the fuel economy by 10%-18%.

Hydrogen truck kit being installed
Hydrogen truck kit being installed

The service life and maintenance method of hydrogen truck kit

The effective service life of the product is 12000 hours. About three years in a car and about two years in a van. The product is guaranteed for 2 years.
Maintenance method: need to add pure water, not mineral water. Replace the resin every 6 months.

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