LPG GAS CONVERSIONS
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LPG GAS CONVERSIONS, AIR CONDITIONING,  ENGINE MANAGEMENT PROBLEMS
 

 

   

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Tel: (01302) 722282 Fax: (01302) 337127
E-mail: info@centralgaragecarcroft.co.uk

Central Garage (Carcroft)
Proprietor: J.& A. Padgett

AG AUTOGAS SYSTEMS

AG AUTOGAS SYSTEMSTechnical developments are advancing with increasing speed in the field of static ignition and multipoint-fuel systems for petrol engines.

The LPG in the current DGC autogas systems, is fed into the engine’s intake system centrally (singlepoint).
In the future the singlepoint system will be increasingly difficult to apply within the concept of an engine developed for multipoint injection. In spite of the very good results being achieved with current DGC systems.

AG Autogas Systems has the solution:


DGI - Digital Gas Injection.

DGI high-tech MULTIPOINT GASEOUS LPG injection system
AG Autogas Systems has developed the DGI high-tech MULTIPOINT GASEOUS LPG injection system over a period of 6 years.
The LPG injection which injects the LPG in pulses independently timed for each cylinder, is a new feature of this innovative system.

AG LPG INJECTORJust as with a petrol injector, the quantity of LPG injected is regulated by varying the duration of opening. In the heart of the injector, a large plunger is drawn up electronically, after which an LPG pulse is injected.

The DGI computer receives information from an orifice meter which measures the volume of the LPG injected. Situated behind the orifice meter, a splitter divides the main pulse exactly into three or four equal parts.

The Closed-loop-flow feedback system compensates automatically and immediately for variations in LPG pre-pressure or injector behaviour so that this has no repercussions for the injection programming.

DGI computer
The advanced DGI management computer uses engine-speed and load sensor signals to calculate the basic quantity of LPG injected for each engine revolution. This quantity is corrected by lambda regulation, using the lambda signal in the exhaust pipe, and any variations are stored in a memory index field. During acceleration, extra fuel is injected for a short time at high frequency while during deceleration the LPG fuel supply is shut off. A unique feature is the electric drive for the LPG injectors which is completely flow-regulated and is thus independent of battery voltage and/or temperature variations. The closed-loop flow regulation for the injector uses the feedback flow-signal to control the duration of opening so that the correct amount of LPG is injected.

DGI Example Emission Results

DGI Example Power Output Results

Diagnosis
For system control and diagnosis, the dealer can use the Organizer from the AG test kit to establish direct contact with the DGI computer.
All signals, self-learning data or error code data can thus be checked and read out.
After installation, the DGI system must be briefly programmed via this Organizer. In all cases, the R&D department can be requested to perform a remote diagnosis via a modem link and offer help where possible.

Advantages:

  • DGI Multipoint LPG Injection greatly reduces the risk of backfire.
  • The difference in engine power-output between LPG and the petrol original is almost zero, thanks to the absence of a venturi choke.
  • Better fuel-economy through shutting off of LPG injection during deceleration.
  • Exhaust emissions satisfy the stringent European demands and the Dutch G3 test.
  • Because of the injector's high speed and wide opening, the DGI system is not prone to fouling. This guarantees optimum performance in summer and winter.

View pictures of a Range Rover 4.6 converted to LPG with a DGI system


 

SGI - Sequential Gas Injection

AG Autogas SGI Systems - The new LPG system for today and the future
Now from AG Autogas Systems,
SGI Sequential Gas Injection.

AG Autogas Systems has developed a new LPG system that has almost identical characteristics to original petrol-injection systems. This new system, Sequential Gas Injection (SGI), has been developed at the request off, and in close collaboration with various automobile manufacturers. AG has based the development of SGI on their wishes with regard to the performance and quality of LPG systems.

For the first time, attempts to design a LPG system while retaining the original characteristics of the car have been successful. This means that after the SGI system has been installed, reliability and quality remain pretty well unchanged. Comparisons of the car’s driving characteristics before and after installation have shown very positive results.

  • Performance equal to petrol injector

  • Injection per cylinder with Sequential strategy

  • Compact components

AG Autogas SGI Performance REsults

Liquid gas flows form the LPG tank to the regulator in the engine compartment. The liquid gas is then vaporised in this regulator and the LPG pressure adjusted to a stable value. The LPG then flows through the common rail to the SGI Injectors, which are attached to every inlet manifold.
The SGI computer calculates the desired injection moment and the duration of injection for each cylinder required independently.

Advantages of the SGI System

  • Performance and driving characteristics almost identical to petrol
  • Quality and reliability conform to automobile industry standards
  • Suitable for worldwide retrofit market
  • SGI meets new emission requirements and complies with EOBD
  • Significantly lower fuel consumption

SGI meets EURO 4 emissions
Emissions result in EURO 4 test tested at TNO:

CO 0,97 gr/ km
HC 0,05 gr/ km
NOX 0,04 gr/ km
  SGI
  Petrol
  EURO 4 limit

AG Autogas SGI Emissions Test Results


 

DEVELOPMENT OF THE LPG MARKET

In Europe, the requirements regarding exhaust emissions are being continuously tightened and this attention to the environment is leading governments to encourage driving on LPG. LPG is also receiving greater attention worldwide. A great many large cities are increasingly permitting access to LPG cars only in order to prevent smog.

The LPG market is clearly going to see further positive development in the coming years. The demand for LPG systems that satisfy the most stringent demands is keeping pace with this. In the Netherlands, considerable reduction in road-tax for cars equipped with the so-called ‘G3’ autogas system will increase drastically the demand for LPG systems.

THE NEW G3 REQUIREMENTS

For AG Autogas Systems, investment in developing systems which satisfy the latest requirements was obvious from the very beginning. Having anticipated changing requirements, AG is now in a position to offer a fully operational DGI system which not only achieves emissions of at least 30% below the standard for petrol (in accordance with the new G3 requirements), but which also eliminates the difference in performance between petrol and LPG for the driver.
Digital Gas Injection is a self-learning, non-adjustable system providing optimum engine performance and low exhaust emissions and is developed by a company that satisfies the stringent ISO 9001 standards.
DGI satisfies all the G3 requirements which enable, in the Netherlands for instance, an immediate and considerable reduction in road-tax for driving on LPG after installation of the system.
The new Sequential Gas Injection system is an excellent performing LPG/CNG system that is able to meet EURO4 emissions limits and complies with EOBD (European On Board Diagnostics) regulation.

Another advantage of using a DGI or SGI system is that there is no risk of backfiring in the intake manifold.

 

ON A WORLDWIDE SCALE

AG Autogas Systems AG Autogas Systems is one of the top autogas systems suppliers and has been active worldwide in the market for more than 25 years. This market has developed to a high level in the Netherlands and Italy in particular, and is why AG is chiefly based in these countries. Close cooperation with a large number of car manufacturers and importers means that the AG systems can be offered on a worldwide scale.

AG has worked to a clear philosophy regarding quality.
The ISO 9001 certification.

Visit the AG Autogas website


 

RANGE ROVER 4.6 CONVERTED TO LPG WITH A DGI SYSTEM

RANGE ROVER 4.6 CONVERTED TO LPG WITH A DGI SYSTEM RANGE ROVER 4.6 CONVERTED TO LPG WITH A DGI SYSTEM
RANGE ROVER 4.6 CONVERTED TO LPG WITH A DGI SYSTEM RANGE ROVER 4.6 CONVERTED TO LPG WITH A DGI SYSTEM
RANGE ROVER 4.6 CONVERTED TO LPG WITH A DGI SYSTEM


To find out which LPG system is recommended for your vehicle, please speak to John at Central Garage.

TEL: 01302 722282
Email:
info@centralgaragecarcroft.co.uk

 
       


Central Garage (Carcroft)
Proprietor: J.& A. Padgett
Unit 19, Victoria Road Industrial Estate,
Victoria Road, Adwick_le_Street, Doncaster,
South Yorkshire DN6 7AZ

 
       
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