LPG and CNG

• Sequent Plug & Drive is the new system for LPG/CNG conversion developped by BRC.

• Designed on the basis of the previous Sequent systems but characterised by a totally new approach of gas flow management.

• Main innovation is in the software for engine management. Thanks to its new algorithms, it allows an optimised feeding of gas fuel, in a simply and intuitive way.

• Some of more advanced functions have been integrated and others have been added in order to simplify the calibration procedure.

Sequent Plug & Drive

SEQUENT PLUG & DRIVE – LPG KIT

Into the kit

• LPG Solenoid valve ET98

• Genius MB/Max reducer (water temperature sensor 2 poles)

• Fuel Rail with BRC injectors and PTS sensor (brown connector)

• MAP Sensor with integrated connector (grey)

• ECU

• Harness

• Change-over switch one-touch with buzzer

• Gas filter FJ1 HE

Out of the kit

• Harness for petrol injector cutting (dx, sx, etc.)

• High pressure pipe (copper or flexible at choice)

LPG SYSTEM

SEQUENT PLUG & DRIVE – CNG KIT

Into the kit

• VM A3/E solenoid valve

• Zenith reducer (water temperature sensor 2 poles)

• Fuel Rail with BRC injectors and PTS sensor (black connector)

• MAP Sensor with integrated connector (grey)

• ECU

• Harness

• Change-over switch one-touch with buzzer

Out of the kit

• Harness for petrol injector cutting (dx, sx, etc.)

• High pressure pipe (copper or flexible at choice)

• Filling nozzle

CNG SYSTEM

HARNESS

HARNESS

To connectTo connect

• Power

• Ignition on

OptionalOptional

• Connection to OBD plug depending on type of connection

• Lambda oxygen sensor IN

““In case of need”In case of need”

• Lambda oxygen sensor OUT

• External timing advancer(for CNG)

• RPM signal

Connection 6-7-8-9 1-2-3

Type CAN BUS K LINE

PIN 6 - 14 7

NEW GAS ECU

HARDWARE INNOVATION

• Communication with new change-over switch and PC on same K line

• Communication with petrol OBD on K line or dedicated CAN

• Output for timing advancer external unit (for CNG)

SOFTWARE INNOVATION• Totally revised

− Injection Control− Self-mapping− Leaning in Open Loop− Tip-in / Tip-out and Setup already activated

New functions thanks to communication to OBD.

WHAT’S NEW: what you can see

WHAT’S NEW: what you CAN’T see

• Improvement in Fuel Control management

• Improvement in RPM reading from petrol injector’s Ton: consequently, RPM signal is no more necessary

• A new grafic for the interface sw has been created with same lay-out with all other Sequent systems

BASIC CONCEPTS

Sequent PLUG & DRIVEsystem

INSTALLATION SEQUENT

PLUG & DRIVE

SELF MAPPING

CHECK THE MAP AND

VEHICLE PERFORMANCE

IS VEHICLE

OK?(OPEN LOOP

condition)

DELIVER THE CAR

TO CUSTOMER

IS VEHICLE

OK?(TIP-IN, TIP-OUT,

RETURN TO IDLE)

IS VEHICLE

OK?

DRIVEABILITY:O.L. STRATEGY

DRIVEABILITY À : REFINE TIP-IN, TIP-OUT,

RETURN TO IDLE

CHECK MECHANICALINSTALLATION

NO

NO

NO

YES

YES

YES

INSTALLATION AND CALIBRATIONPROCEDURE FOR SEQUENT PLUG & DRIVE

Injection: Calculation

+12 V

PETROL flow

calculation

MAP

T gasP1

Gas flow

Petrol INJECTOR

+12 V

Gas INJECTOR

Petrol ECU

TonP

Violet

Orange

GAS ECU

TonG

TonP reading

Step1

Ton G calculatio

n

Step3

GAS flow calculatio

n

Step2

Petrol flow

BRC injectors characteristic

s

+12 V

GAS EQUIPMENT CARACTERISATION

START PROCEDURE

SELECT TYPE EQUIPMENT(Step 1)

SETUP EQUIPMENTAND TYPE OF INJECTORS

(Step 2)

SAVE FILE .FPD(Step 3)

SELF-MAPPING(Step 4)

END OF PROCEDURE

SELF-MAPPING PROCEDURE SEQUENT PLUG & DRIVE

SAVE FILE .FPD(Step 5)

SELF-MAPPING

SELF-MAPPING

Start procedure

3 accelerations

Sequential Change-overAutomatic fromPetrol to Gas:

1st Correction Gas Map

Idle in petrol … what’s 1st

Correction

Gas Map?

1° STEP

2° STEP

3° STEP

4° STEP

Gas Injectorswitched

Gas maperror

1st Correction Gas Map

SELF-MAPPING

Start procedure

3 accelerations

Sequential Change-overAutomatic fromPetrol to Gas:

1° Correction Gas MapSwitch to Petrol

Switch to gas: 2° Correction Gas Map

End procedure

Idle in petrol

CHECK DATA GAS MAP

3° Correction Gas MapOKOK

KOKO

MANUAL CHECKING GAS MAP

Correction at idle

Correction at medium and high

power

OBD parametersbank 1 OBD parameters

bank 2

CLOSE LOOP = Map refinement

CLOSED LOOP = Map refinement

Correction at idle

Gear correction

OBD parameters bank 1

OBD parameters bank 2

“Easy Refinement”

CNG map parameter

CLOSED LOOP = Map refinement

Ton at idle (in Gas operation)

Map refinement @ idle

Ride “Easy Refinement”

“Easy Refinement”: points on petrol

“Easy Refinement”: points on gas

“Easy Refinement”: gas map modification

“Easy Refinement”: gas map modification

Warning!

Important concepts Map Refinement – Close Loop

• Idle control: taking into consideration MAP variation and checking Lambda sensor trend, check that, when switching from petrol to gas, TonP is still the same. When possible, connect EOBD tester to check self-adapting parameters

• Gear control: check the map with TonP more than that at idle. I.e. 9-10 ms

• If connection to EOBD plug is present, check the self-adapting parameters

• Ton Min Gas = value of TonP at idle during gas mode

• Map parameters: after map refinement, always check that numeric value of Q is negative (<0). If positive, some flow will be delivered by gas injectors even when petrol ECU is in cut-off (TonP=0)

SETUP

DRIVEABILITY

BEFORE STARTING A DRIVEABILITY SETUP, BE SURE THAT GAS FLOW IS

CORRECT CHECKING IT BY

MAP REFINEMENT.

In the Closed Loop management, the petrol injection supplies the optimal fuel quantity in order to obtain a stoichiometric mixture (QPStoich.).

The gas flow (QG) is calculated starting exactly from this petrol quantity.

QPStoich. QG

In the Open Loop management of the petrol injection, the stoichiometric conditions are usually abandoned in favour of a mixture richer in petrol (QBStoich.+ ENO.L.), of considerable percentages too (for instance 30%).

QPStoich. + ENO.L. QG + ENO.L.

QPStoich. + 30% QG + 30%

For instance:

OPEN LOOP = Leaning in O.L.

Working of the leaning in O.L. strategyThe aim of the leaning in O.L. strategy is to limit the enrichment with which the petrol setup is calibrated for the working in Open Loop.

OPEN LOOP = Leaning in O.L.

On the basis of the parameters acquired during the self-mapping, the strategy recalculates in a independent way the optimal petrol quantity (QPoptimal) needed to keep a rich calibration for the Open Loop condition, but limited compared to the original one. However, enrichment is always possible if needed. (EN LIMIT).

QPStoich. + ENO.L. QG

QPOptimal (Rich) QPStoich + EN LIMIT=

o When petrol ECU, working on gas, requires an higher enrichment compared to the Optimal Limited one, Sequent P&D will calculate gas flow starting from the Optimal Limited.

When the leaning in O.L. strategy is enabled, system compares the Real Petrol Flow to the Optimal Limited one (recalculated by Plug&Drive system) to select on which one calculate the Gas flow.

QPStoich. + ENO.L. QPOptimal (Rich)

o If the Real Petrol Flow required by petrol ECU is lower than the Optimal Limited one, Sequent P&D will not make any cutting and gas flow will be

calculated on the Real Petrol Flow

>

QG

QPStoich. + ENO.L. QPOptimal (Rich)<

QG

OPEN LOOP = Leaning in O.L.

OPEN LOOP = Leaning in O.L.

Description:

• Vertical line is RPM indication.

• BLUE line is the calculated amount of petrol without “Wall Wetting” strategy (Optimal Limited)

• red points are values of lambda oxygen sensor, acquired during self-mapping

• green points are actual fuel quantity required by petrol ECU.

o If green points are above the blue line, strategy actually leans, down taking the fuel quantity to the blue points level, instead of level of green points

o For RPM in which green points are below of the blue line, leaning is not done and gas quantity is the same required by petrol ECU, that of green point

OPEN LOOP = Leaning in O.L.

OPEN LOOP = Leaning in O.L.

OPEN LOOP = Leaning in O.L.

Tip-in / Tip-out

Cold Strategy

Return to Idle

DATA MONITORING

Data Monitoring

EOBD PARAMETERS

EOBD Parameters

Tester EOBD (N° Connection)

Communication Protocol

Type connection

Pin to connectAvailability

Communication SP&D

1 ISO 9141 slow K LINE 7 YES

2 ISO 14230 fast K LINE 7 YES

3 ISO 14230 slow K LINE 7 YES

4SAE J1850

VPM-- -- NO

5SAE J1850

PWM-- -- NO

6CAN 250 Kbit/s

– 11 bitsCAN BUS 6 - 14 YES

7CAN 250 Kbit/s

– 29 bitsCAN BUS 6 - 14 YES

8CAN 500 Kbit/s

– 11 bitsCAN BUS 6 - 14 YES

9CAN 500 Kbit/s

– 29 bitsCAN BUS 6 – 14 YES

Resuming Table for EOBD connections

• Connection to EOBD PLUG is not necessary for the good working of the vehicle in gas.

• Some parameters read by EOBD plug are used by Sequent PLUG & DRIVE for further refinement of the fuel control.

• In addition, these parameters make it easier the manual refinement of gas map, showing the value of the self-adapting parameters in the Map Refinement page.

• EOBD parameters are also shown and should be recorded during the normal acquisition of gas paramenters in Data Monitoring page.

EOBD Parameters

ECUVERSION

SEQUENT PLUG & DRIVE

ECU LIFE

FORCED GAS STARTING COUNTER

ECU Version