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The Akme LPG/CNG Sequential Gas Injection System

The Akme LPG/CNG Sequential (vaporized) Gas Injection System is designed for vehicles with advanced petrol supply diagnostics system (OBD II/EOBD), with catalytic converter and Lambda sensors, and meets the EURO 4 fuel emission standards.

The Akme system can be adapted to fit all engines with multi-point fuel injection, as well as sequential, semi-sequential or fullgoup.

The use of a very fast microcontroller, acting as a signal proccessor and a “smart” controller of the output unit of the gas injectors, enables precise and instantaneous control of the gas-air mixture at the same moment (time point) at which the petrol ECU would inject fuel for the current cylinder. The very precise and time-synchronized gas injection means that no difference is felt between running on gas and petrol. There is no significant loss of power or difference in the vehicle’s dynamics, and the vehicle offers the same acceleration when running on gas as with petrol.

The operation principle of the Akme system bases on the petrol injection system – separately and independently for each channel. At every moment while the engine is running, the petrol ECU’s strategy of the fuel supply is used. The gas injectors are controlled by means of the signals which control the operation of the petrol injectors, which in turn come out of the current engine need (required for power and dynamics).

The vehicle with the Akme LPG/CNG Sequential Gas Injection System will continue to meet fuel emission standards and will meet OBD II/EOBD requirements without additional emulators.

The vaporized gas is supplied immediately in front of the valves – as in petrol system – which eliminates the possibility of explosions (caused by accumulation of gas in the large volume of the intake manifold).

All engine management and diagnostic functions remain unchanged.

The Akme system has an innovative algorithm, introduced by KME, for calibration of the vehicle during a road test. In all range of loads, the gas control unit collects points reflecting the operation of the engine on petrol and gas, creating maps of the operations of the vehicle. Comparison of those maps makes possible a precise configuration of the vehicle on gas, by establishing a map for gas indentical to that for petrol. Previously this could only be done by means of time-consuming tests using vehicle test benches (chassis dynometer).

The gas control unit has a built-in mechanism for self-diagnosis.

Small enclosure dimensions and a mounting bracket allows a flexible installation in the engine compartment. Te control unit may operate with eight sections of petrol injectors and with many kinds of gas injectors (Matrix, Valtek, Kehin, etc.). It also operates correctly with vehicles without the full injection sequence and with semi-sequential petrol injection, because every channel works separately. Various techniques improving those systems are also implemented.

The Akme system is very simple for installers to calibrate, and is transparent to the user thanks to the automatic switching mode. If the gas tank is almost empty the system switches automatically to petrol supply, and this is indicated by a sound signal (buzzer).

Vehicle driver controls switching between petrol and gas and may observe led-visualized gas tank level with sub-miniature control panel. DIEGO bases its calculations on the petrol injection time calculated by petrol electronic control unit. Then using current parameters from sensors (temperature, pressure, etc.) DIEGO sets up the correct gas injection time and controls gas valves.

The software for Windows 95/98/2000/XP allows to start automatic calibration of the system in order to find correct parameters for the particular vehicle. Installer has also the possibility to manually adjust many parameters and track current readouts.

The Akme system is available in 4-, 6- and 8- channel version for 3, 4, 5, 6, 8 cylinder engines.

We also offer OEM version for customers creating kits themselves.

PC software

Here you can find present versions of Akme PC software.

Kilknij, by powiększyć The software for the DIEGO unit allows to monitor live parameters like:
- open time of the petrol injectors (each one separately or average value),
- open time of the gas injectors (each one separately or average value),
- engine speed (RPM),
- reducer temperature,
- gas temperature,
- current fuel type (petrol/gas),
- pressure on the injector rail,
- vacuum in the engine inlet (if the additional sensor is connected – tab “Map”),
- system supply voltage,
- oxygen sensor (lambda) voltage and state (if connected).

 

Kilknij, by powiększyć There are many configuration option in the device. Using the software one may modify e.g.:
- minimum reducer temperature and minimum engine speed to switch to gas (switching threshold),
- number of injectors (3 to 8 depending on the device type),
- source of engine speed impulses,
- gas injectors type,
- tank level sensor type,
- type of gas fuel (LPG/CNG),
- type of connected oxygen sensor (voltage and state of the oxygen sensor is an information readout only and do not influence the device operation).

In devices starting from 1.3b version, it is possible to set up the conditions of return to petrol in the case of low pressure of the gas. One may modify pressure level and the time of low pressure recognition. It is necessary to use at least 1.3.0.0 version of the PC software.

 

Kilknij, by powiększyć The device has a built-in autodiagnosis system, which greatly simplify finding malfunction or mistake in the installation. It monitors not only the gas system components, but also the elements of the original petrol system (e.g. lack of signal from the petrol injector). Multilevel thermal and current protection allows a secure (for a device and for the user) disabling of the system in case of external components malfunction.
In units starting from 1.3c DIEGO operates correctly with the traction control systems TC/ASR.

 

 

Kilknij, by powiększyć DIEGO gas injection system has a feature of automatic calibration for a particular vehicle. To start the procedure, after verification of the configuration options, it necessary to use option “Autocalibration”. The device will make a several steps procedure and then will set up appropriate parameters for the mathematical model in order to get a corretly burned air-gas mixture. During the calibration it is necessary to read and execute commands written on the screen. Optimally we shall do the autocalibration wit the engine speed around 2500 rpm.

 

 

Kilknij, by powiększyć After the procedure of autocalibration, the basic parameters of the model can be modified by the installer. During the operation of the device, the clearly visible point on the chart shows the current working parameters. It is possible to enrich or lean the mixture for the specific load segments (in this case open time for petrol injectors) or for the entire range. Parameter “Mult” allows modifying (with percents accuracy) the gas-air mixture with the respect to petrol-air mixture. Parameter “Offset” allows adding a constant value to the open time of the petrol injectors, which may be useful e.g. to adjust for the different gas injectors.

 

 

Kilknij, by powiększyć In order to verify the correctness of the settings and ensure that the vehicle works correctly in the whole range of the engine loads, it is necessary to create so called “map” of the unit. Maps are created during driving on the petrol (we treat this map as a base) and then driving on the gas. To start the map creation process it is necessary to connect additional pressure sensor (calibration set) to the device and then make a road test. The device will automatically store the point of the map. During the test it is required to keep the engine speed around 2500 rpm (2200-2800 rpm) and different but stable loads. The given part of the road one must drive twice, once on the petrol, then on the gas. During the test it is possible to see the results on the connected PC (using the PC is not necessary). The PC software (staring from version 1.3.0.0) allows visualization of the map points on the “modeling” tab. It can also calculate new parameters based on the map (option “recalculate model” on the “map” tab). This greatly simplifies finding correct parameters of the model. It is needed to set “mult” and “offset” parameters in order to cover the map points by the red line of the model.

Configuration options, model and the map one may save in the file on the disk and then load them to the device (see “file” menu). Inside the PC software one may find a connection diagram of the device. Using the option “print” from the “file menu” it is possible to print it on the printer.

The interface for the programming is available in our offer. It is exactly the same interface used for BINGO-S and BINGO-M lambda systems.

The device is certified according to Regulation no. 67R01. Type-approval numbers you may find here

 

Infoline & technical support for foreign and mobile connections: 0048 422 999 139

*From Polish landline call 0801 563 563 or 0801 KME KME
KME Poland - Teresy 103a, PL-91-222 Lodz, tel. +48 (42) 6110026, fax +48 (42) 6118252, http://www.kme.com.pl
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