Based on the M.T.M. Co.’s long experience in thedesigning and construction of LPG and CNG

gaseous injection systems called SEQUENT,the new multipoint sequential system consti-

tutes the peak of the current technology in the fieldof the gaseous injection for running engines at a con-

trolled ignition.

The system is the result of the M.T.M. Co.’s engagement tomeet the technological requirements of the current and futuregenerations of vehicles, not only as to the mandatory emissionstandards, but also as to the diagnostic and the integrationwith the original system, according to the provisions of themodern norms on the EOBD.

The M.T.M. Co.’s response is a systembased on electro-injectors (tested follow-ing the standards of the car-makers)assuring the better integration, both elec-tronically and for communication(through K serial line and CAN BUS), andin the mechanical and fluid dynamic con-text of the vehicle.

The system make-up

The BRC multipoint sequential injection system is based oncomponents validated in the automotive field by carmakers,such as:the refuelling point, the tank, the pipes reaching the front ofthe vehicle, the gas cut-off solenoid valve, the reducer-vapor-iser of the GENIUS and GENIUS MAX type, the injectors, therubber connection pipes, the gas/petrol changeover switchwith gas level gauge, the gas pressure and temperature sen-sors and the MAP sensor, the gas level sensor;and on innovative components conceived to assure andimprove safety or to implement new functions, such as: the Europa multivalve, the Fly SF ECU, the injectors rail.

Functions

The control of the fuel-air mixture titer is assured by the origi-nal petrol ECU while running on gas too (system of the seriestype); the gaseous injection system is only aimed at turningthe control sent from the petrol ECU to the injectors into anequivalent control to the gas injectors. The whole diagnosticperformed by the petrol ECU is this way preserved and kepton working while running on gas too (apart from the controlof the petrol injectors that are excluded while running on gas),assuring the OBD compatibility. The petrol injection times-gasinjection times translation is carried out through predictivealgorithms enabling the gas injection in every cylinder duringthe petrol injection on the corresponding injector.

The Fly SF ECU measures the gas pressure that feeds the injec-tors and rectifies the gas injection times depending on thevalue read, it makes practically the gas quantity injected inde-pendent compared with the small pressure variations.

The series operation of the system assures and preserves thestrategies used by the carmaker, as the management of theout-of-revs and of the cut-off in tip-out, the drive control, thecut-off of injectors on the cylinders where the missed ignitionsare spotted, and the control of carburetion during the drainphase of the can.

The petrol injection times-gas injection times translation mapsare functions of the engine r.p.m. and of the manifoldabsolute pressure (MAP) and are automatically varied by aself-adaptative strategy that pursues the possible wear andtear of both systems. We assure this way that the gas systembehaviour repeats, in very instant of the system life, the behav-iour of the specific vehicle being equipped.

The OBD compatibility is assured by thesystem working principle of the seriestype and by the sophisticated diagnosticof the sensors and of the actuators carriedout by the gas ECU. In the event of failureof an original component of the vehicle,the petrol ECU will be able to regularlydiagnose it. The vehicle will be thereforealways able to run in observance of theOBD norms. Therefore the vehicle will be

always able to work respecting the OBDrules.

In case of exhaustion of LPG, the changing-over to petroloccurs automatically. It is especially comfortable and safe asthe user can keep on driving undisturbed, without operatingon the changeover switch. The automatic changing over topetrol could be immediately indicated to the driver, through abuzzer and special optical signals. Also the changeover froma fuel to another is in sequential way. By following a patent-ed strategy, the Fly SF ECU is able to act the changeover oneach cylinder one at a time, making so unnoticed the changefrom a condition to the other in every driving condition.

It has been paid particular attention, in order to obtain anadvanced gas feeding system with the maximum technologi-cal knowledge, but in the meantime versatile and easy to use.For this reason SEQUENT is a “open” system, usable both onvehicles developed by BRC, and on those vehicles directlydeveloped by installers duly trained.In the point of view to assure a rugged and reliable system,all the protections and precautions asked to BRC by the car-makers have been taken (filters, waterproof connections, pro-tections from installation mistakes, etc…).

The sequential injection of SEQUENT allows to obtain excel-lent results for what concerns polluting emissions, alwaysassuring the performances and a very good driving level.

The capacities to feed are over 30 kW per injector, beingable to pilot up to 8 injectors, 240 kW in all correspondingto 326 HP; vehicles provided with aspirated or superchargedengines can be installed indifferently.

SEQUENT: BRC MULTIPOINT SEQUENTIAL INJECTION SYSTEMAPPLICATION RANGE OF THE SYSTEM

TA01

Z00

6I-1

- 09

.06

- U

ff. P

&P

MT

M

Multipoint sequentialinjection system

with BRC electro-injector

SEQUENT: BRC MULTIPOINT SEQUENTIAL INJECTION SYSTEMFEATURES OF COMPONENTS

BOTTOM FEEDFloating shutter during friction absenceImpedance: 2.04 Ω / 2.35 mH a 20 °CVibrations: 1,5 g between 50 Hz and 400 HzTemperature: -40 °C ÷ 120 °CVoltage: 6 V ÷ 16 VTightness: rubber on metalNoise: < 90 dBRegulation: R67-01; R110

Electro-injector BRC “IN03”

Values by way off example only.

Sequent LPG GENIUS Reducer/Vaporizer Diaphragm single-stage typeSet out pressure:120 kPa or 150 kPa related to the air-intake manifold pressureNo bleeding neededMax. capacity to feed with SEQUENT system: 140 kWRegulation: R67-01

Genius MAX LPG Reducer/Vaporizer Diaphragm single-stage typeSet out pressure: 150 kPa related to the air-intake manifold pressureNo bleeding neededMax. capacity to feed with SEQUENT: 240 kWRegulation: R67-01

LPG feeding capacitiesGenius 800 Genius 1200 Genius 1500 Genius MAX

Inj. Normal Type Aspirated 17 kW/cylinder 21 kW/cylinder 23 kW/cylinder -Supercharged 22 kW/cylinder 26 kW/cylinder 28 kW/cylinder -

Inj. Max Type Aspirated - 26 kW/cylinder 30 kW/cylinder 30 kW/cylinderSupercharged - 32 kW/cylinder 36 kW/cylinder 36 kW/cylinder

Inj. Super Max Type Aspirated - - 35 kW/cylinder 35 kW/cylinderSupercharged - - 42 kW/cylinder 42 kW/cylinder

LPG INLETWATER

LPG OUTLET

TEMPERATURE SENSOR

RETROACTION

WATER

LPG VAPORIZED LIQUID INLET

TEMPERATURE SENSOR

LIQUID INLET

WATER

LPG VAPORIZED

RETROACTION

SEQUENT is a versatile system thanks to powerful interface software developed by BRC. By means of a portable PC, the software allows to communicate with the FlySF ECU and reach all its functionalities.

FLY SF ECU Programming.The programming of the gas ECU necessary to obtain the correct working of the equipped vehicle is simple and quick when the configurations are already availablefrom the BRC web-site, from local dealers or from previous installations made by installers. A simple and drivenprocedure instead allows developing independently the configurations for those cars which are still not availablefrom other sources.

Diagnostic.Thanks to the diagnostic functions it is simple to verify the correct installation or find out the causes of malfunction.The ECU inspection on input and output faults and the consequent error message, the possibility to act actuators toverify the correct working, the alphanumerical and graphical monitoring of all data related to the system workingmake this interface software like an instrument able to simplify the complex things.

Offline/utility.A series of functions, qualified even if disconnected from the Fly SF ECU, allows to check and manipulate data andconfigurations previously filed, organising kike that an archive or preparing a subsequent work.

SEQUENT: BRC MULTIPOINT SEQUENTIAL INJECTION SYSTEMFEATURES OF COMPONENTS

THE INTERFACE SOFTWARE

Opel Zafira 1.8i Euro 4 LPG – Emissions cycle ECE-EUDC

Microcontroller automotive 32 bit 20 MHzOperating Temperature: -40 °C + 125 °C

Waterproof tightness for immersionObservance of the automotive rules on protections and input/output signals

Operating voltage: 6.5 V ÷ 18 VSensors diagnosis and compatible actuators with EOBD

Communicates and it is re-programmable by PC through K lineSupports the communication protocol KWP2000

Supports CAN 2.0 communicationEMC compliant

Pilots : up to 4 injectors in the version with one connectorup to 8 injectors in the two connectors version

Integrated injectors cut-offIntegrated timing advance processor

R.P.M. signal reading also from crankshaftRegulation: R67-01; R110

FLY SF electronic control unit

Working diagram

A system that guarantees all advantages of LPG feeding without worsening theoriginal power of the engine is the aim achieved with SEQUENT.

The precise fuel dosage linked to the possibility to optimize spark advances,allows to obtain optimal performances.

Cartridge filterLoad loss:

35 kPa with Q= 18000 Nl/h (test fluid air)Regulation: R67-01; R110

FJ1 HE Gaseous Phase Filter

Emissions (g/km) Euro 4 Limits (g/km)