Presentation on theme: "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."— Presentation transcript:
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)
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
T TT To connect Power Ignition on Optional Connection to OBD plug depending on type of connection Lambda oxygen sensor IN In case of need Lambda oxygen sensor OUT External timing advancer (for CNG) RPM signal Connection TypeCAN BUSK LINE PIN
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.
WHATS NEW: what you can see
WHATS NEW: what you CANT see Improvement in Fuel Control management Improvement in RPM reading from petrol injectors 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 & DRIVE system
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 MECHANICAL INSTALLATION NO NO NO YES YES YES INSTALLATION AND CALIBRATION PROCEDURE 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 calculation Step3 GAS flow calculation Step2 Petrol flow BRC injectors characteristics +12 V GAS EQUIPMENT CARACTERISATION
START PROCEDURE SELECT TYPE EQUIPMENT (Step 1) SETUP EQUIPMENT AND 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 Start procedure 3 accelerations Sequential Change-over Automatic from Petrol to Gas: 1 st Correction Gas Map Idle in petrol … whats 1 st Correction Gas Map?
1° STEP 2° STEP 3° STEP 4° STEP Gas Injector switched Gas map error 1 st Correction Gas Map
SELF-MAPPING Start procedure 3 accelerations Sequential Change-over Automatic from Petrol to Gas: 1° Correction Gas Map Switch to Petrol Switch to gas: 2° Correction Gas Map End procedure Idle in petrol CHECK DATA GAS MAP 3° Correction Gas Map OK KO
MANUAL CHECKING GAS MAP
Correction at idle Correction at medium and high power OBD parameters bank 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)
Ride Easy Refinement
Easy Refinement: points on petrol
Easy Refinement: points on gas
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 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)
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 (Q PStoich. ). The gas flow (Q G ) is calculated starting exactly from this petrol quantity. Q PStoich. QGQG In the Open Loop management of the petrol injection, the stoichiometric conditions are usually abandoned in favour of a mixture richer in petrol (Q BStoich.+ EN O.L. ), of considerable percentages too (for instance 30%). QP Stoich. + EN O.L. Q G + EN O.L. Q PStoich. + 30% Q G + 30% For instance: OPEN LOOP = Leaning in O.L.
Working of the leaning in O.L. strategy The 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). Q PStoich. + EN O.L. QGQG Q POptimal (Rich) Q PStoich + 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. Q PStoich. + EN O.L. Q P Optimal (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 > QGQG Q PStoich. + EN O.L. Q POptimal (Rich) < QGQG 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.
Tip-in / Tip-out
Return to Idle
Tester EOBD (N° Connection) Communication Protocol Type connection Pin to connect Availability Communication SP&D 1 ISO 9141 slowK LINE7YES 2 ISO fastK LINE7YES 3 ISO slowK LINE7YES 4 SAE J1850 VPM -- NO 5 SAE J1850 PWM -- NO 6 CAN 250 Kbit/s – 11 bits CAN BUS6 - 14YES 7 CAN 250 Kbit/s – 29 bits CAN BUS6 - 14YES 8 CAN 500 Kbit/s – 11 bits CAN BUS6 - 14YES 9 CAN 500 Kbit/s – 29 bits CAN BUS6 – 14YES 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
SEQUENT PLUG & DRIVE ECU LIFE FORCED GAS STARTING COUNTER ECU Version