Improved Mosfet switching circuit for powering Hydrogen fuel system
Improved power supplies
Hve been doing a many hours R and D on development of a new improved power supply for hydrogen fuels systems. The Issue I have experienced is the excessive wastage of electrical energy in operating a power supply originally designed to power DC motors , that have an excessive amount of electrical circuitry whose only function is to prevent back voltage that reduces the efficiency and Power output of an inductive DC motor circuit.
There are many potential sites available online , both on you tube and on research URL sites that describe effective DC control / switching circuits that use MOSFET components . Many of these are still biased to DC motor circuits but we have managed to modify several simple circuits that use Banks of MOSFET’s connected in parallel with biasing 10k pots , to control / switch the current on in these Electrolysis circuits , without wasting excessive voltage on the internal circuitry.
After many many many hours of operation and testing of these switching Power supply circuits we will now get them made professionally and install them in the latest models of hydrogen fuel systems.
There are several advantages of the new circuitry
- All available battery voltage / electrical energy is available for the electrolysis cells
- No overvoltage is wqsted through the PWM heat sink , thus preventing problem s of electronic thermal runaway problem
- The MOSFET is a VOLTAGE CONTROLLED DEVICE rather than a current controlled device as in transistors ad IC’s thus leaving little chance of thermal runaway damage and making it easier to set, control and use
- Less parts , simpler construction and less maintenance problems
- Truly able to use as a set and forget technology
- Cheaper to manufacture and cheaper to repair if so needed.
Recommended Mosfets for these systems are the 10 amp 12 volt MOSFETS, – 5 OF THEM CONNECTED IN PARALLEL. Providing control for up to 50 amp of current .
Once the systems are manufactured professionally by our fabricator, they will be mounted into a protective ventilated cage onto a designed circuitboard
Photos will follow soon and schematics will be available on this site
“Just 20% of hydrogen mixed with normal diesel fuel will instantly reduce emissions by a whopping 40%. Dr Vishy Karri at the University of Tasmania is working on this technology as an add-on to existing vehicles – starting with a postie’s bike.”
hydrogen–diesel duel fuel testing at University of Tasmania 2006
As Part of this website , and with being a Qualified Astro-Physicist, Chemist and Civil Engineer , I have decided to publish a series of interactive PDF documents with the aim of educating our young girls and boys interested in studying Physics and Chemistry.
INITIALLY these documents / posts will be mixed in with the hydrogen fuel systems posts. The aim of these posts is to help my year 12 Physics students working on Particle-physics and the structure of matter — Australian Science Curriculum
M9re to follow
Hydrogen fuel systems
Hydrogen systems for Diesel Engines University Research
Hydrogen fuel systems. Today October 3 2017, On Holidays at Ramada resort, Dunsborough WA, I was conducting research online for the following research topic
“hydrogen systems for diesel engines university research”
I was able to find many authentic research articles including ones from a group from with URL address
Science direct is a University research URL requiring membership., However there are many reference links showing authors and published papers which can be easily located online through a google search
One such paper I found to start with was headed “Combustion characteristics of diesel-hydrogen dual fuel engine at low load” and was located at the URL1-s2.0-S1876610213000040-main hydrogen dual fuel
Which I downloaded and have copied onto this post
The research report was well written and a clear concise document providing proof of the use of Hydrogen as a duel fuel for use with diesel
Hydrogen fuel systems
“In the present study, hydrogen utilization as diesel engine fuel at low load operation was investigated. Hydrogen cannot be used directly in a diesel engine due to its auto ignition temperature higher than that of diesel fuel. One alternative method is to use hydrogen in enrichment or induction. To investigate the combustion characteristics of this dual fuel engine, a single cylinder diesel research engine was converted to utilize hydrogen as fuel. Hydrogen was introduced to the intake manifold using a mixer before entering the combustion chamber. The engine was run at a constant speed of 2000 rpm and 10 Nm load. Hydrogen was introduced at the flow rate of 21.4, 36.2, and 49.6 liter/minute. Specific energy consumption, indicated efficiency, and cylinder pressure were investigated. At this low load, the hydrogen enrichment reduced the cylinder peak pressure and the engine efficiency.”
Hydrogen fuel systems
“The advantages of using hydrogen as fuel for internal combustion engine is among other a long-term renewable and less polluting fuel, non-toxic, odorless, and has wide range flammability. Other hydrogen properties that would be a challenge to solve when using it for internal combustion engine fuel, i.e.: low ignition energy, small quenching distance, and low density”
Hydrogen fuel systems
“5. Conclusion Experiments and simulation works were conducted on DI diesel engine with hydrogen in the dual fuel mode. Under constant load and speed engine operation, hydrogen induction into the intake manifold 10 W.B. Santoso et al. / Energy Procedia 32 ( 2013 ) 3 – 10 reduces the diesel fuel consumption. Diesel reduction of 50, 90, and 97% was achieved during the investigation. These relatively high percentages of hydrogen fuel are detrimental to the engine performance in terms of energy consumption and efficiency. An increasing hydrogen flow rate at the low load operation results in a higher SEC. It means that more fuel is necessary to produce the same power output. At this low load operation, the efficiency decreases with hydrogen enrichment. This condition affects the values of SEC. Measurement of in-cylinder pressure was carried out to investigate the combustion process inside the combustion chamber. Hydrogen enrichment reduced the peak pressure and retarded the start of combustion. CFD simulation reveals that hydrogen enrichment in such a high percentage resulted in slower reaction progress due to lower combustion rate of reaction. Temperature distributions along the cut plane at the spray axis showed the progress of the combustion processes. Acknowledgment The authors wish to thank Universiti Malaysia Pahang for supporting this research under GRS 100303. Fully support from LIPI by providing the experiment and simulation facilities are grateful acknowledged.
References  Fulton J, Lynch F, Marmora R. Hydrogen for reducing emissions from alternative fuel vehicle. SAE Technical Paper 1993;No. 931813.
 Saravanan N, Nagarajan G. An experimental investigation of hydrogen-enriched air induction in a diesel engine system. Int J Hydrogen Energy. 2008; 33:1769-1775
.  Pundir BP, Kumar R. Combustion and smoke emission studies on a hydrogen fuel supplemented DI diesel engine. SAE Technical Paper. 2007;No. 2007-01-0055.
 Saravanan N, Nagarajan G, Kalaiselvan KM, Dhanasekaran C. An experimental investigation on hydrogen as a dual fuel for diesel engine system with exhaust gas recirculation technique. Renewable Energy. 2008;33:422-427.
 McWilliam L, Megaritis T, Zhao H. Experimental investigation of the effects of combined hydrogen and diesel combustion on the emissions of a HSDI diesel engine. SAE Technical Paper. 2008;No. 2008-01-1787.
 Saravanan N, Nagarajan G, Dhanasekaran C, Kalaiselvan KM. Experimental investigation of hydrogen port fuel injection in DI diesel engine. Int J Hydrogen Energy. 2007;32:4071-4080.
 Lilik GK, Zhang H, Herreros JM, Haworth DC, Boehman AL. Hydrogen assisted diesel combustion. Int J Hydrogen Energy. 2010;35:4382-4398.
 Saravanan N, Nagarajan G, Dhanasekaran C, Kalaiselvan KM. Experimental investigation of hydrogen fuel injection in DI dual fuel diesel engine. SAE Technical Paper. 2007;No. 2007-01-1465.
 Saravanan N, Nagarajan G. An experimental investigation on a diesel engine with hydrogen fuel injection in intake manifold. SAE Technical Paper. 2008;No. 2008-01-1784.
 Saravanan N, Nagarajan G. Performance and emission studies on port injection of hydrogen with varied flow rates with Diesel as an ignition source. Applied Energy. 2010;87:2218-2229.
 Bose PK, Maji D. An experimental investigation on engine performance and emissions of a single cylinder diesel engine using hydrogen as inducted fuel and diesel as injected fuel with exhaust gas recirculation. Int J Hydrogen Energy. 2009;34:4847- 4854.
 Szwaja S, Grab-Rogalinski K. Hydrogen combustion in a compression ignition diesel engine. Int J Hydrogen Energy. 2009;34:4413-4421
Hydrogen Generator systems for heavy duty trucking
Hydrogen Generator. Recently HFS were commissioned By Coogee chemicals Pty Ltd , west Australia to produce a new configuration of Hydrogen fuel systems to save fuel on their Cummins Powered Kenworth trucking.
The New configuration was mounted into a stainless steel enclosure box with stainless steel piping and stainless steel recycling container which is used to collect the hydrogen gas and pass it through the engine.
The new configuration is designed to be rhobust and capable of handling extreme conditions or rough driving terrain , high temperature . The enclosure box is made from stainless steel 316 and 2.5 mm thick material – easily able to handle reasonable impact loads . The Pumping system is 12V- 24 V with a pressure head od 8 m and only used for mixing the solution.
A digital electronic fuel enhancer module is used to adjust the sensor signals from the 1. Manifold air pressure sensor, 2, Coolant temperature sensor and 3. Air intake temperature sensor – so as to modify the engine fuel map save fuel and increase engine power and torque
The aim of the EFIE is to reduce MAP settings by 10%, increase the AIT settings by 50celcius and CTS settings by 7 celcius.
Photos below show the position of the hydrogen fuel system and efie.
Recently I purchased a 3D printer with then aim of making and testing new designs in both hydrogen generator systems as well as In magnetic generators
After copying a number of designs for system modifictions finally found a program called Tinkercad.com which enabled me to quickly create , modify , adjust , print and test a number of plastic units to be used in systems.
The Beauty of this program Tinkercad.com is that is able accurately and cheaply manufacture multiple versions of a system component without the high cost of a CNC machine
Also provided with this program is an excellent set of training videos to teach you how to get the best of the 3D printer
These devices were used to 3d print scaled versions of both plastic and metal parts for construction of the hydrogen generator system as well as the magnetic motor system.
I will be sharing some of these designs for the world to view , , use, modify as required in building the new generator systems.
New Hydrogen systems installed Coogee chemicals
New Hydrogen systems installed Coogee chemicals heavy haulage trucks
improvement in fuel economy 20%— 16 Litre cummins diesel engine 600 HP – new engine