2.2
DYNAMIC DIGITAL FUEL INJECTION (DDFI)
INTRODUCTION
TOOL NAME
PART NUMBER
DIGITAL TECHNICIAN
HD-44750
The Buell Dynamic Digital Fuel Injection (DDFI) System
provides microprocessor-based electronic engine management
for the 984cc and 1203cc high performance engines. The DDFI
system has the following features:
•
Independently mapped spark and fuel control.
•
Engine and air temperature compensated fuel delivery.
•
Engine load measurement through throttle position.
•
Single point spark delivery (no waste spark).
•
Sequential port indirect (manifold) fuel injection.
•
Open/closed-loop air/fuel control.
•
Automatic enrichment at start-up.
•
Electric cooling fan for improved thermal management.
•
Engine speed position determined using a single sensor
Crankshaft Position (CKP) Sensor.
•
Engine idle speed managed electronically with idle air
control (IAC) motor.
•
Full diagnostic capability compatible with the DIGITAL
TECHNICIAN (Part No. HD-44750).
•
Returnless fuel system (excess pressure relieved in tank
by Fuel Pressure Regulator Valve).
•
Interactive muffler control with muffler valve position
feedback for 1203cc engines only.
The DDFI system uses ten sensors to monitor the operating
conditions of the engine and make decisions as to ignition and
starter enable, spark and fuel delivery. These sensors are:
•
Throttle Position (TP) sensor.
•
Crankshaft Position (CKP) sensor.
•
Engine Temperature (ET) sensor.
•
Intake Air Temperature (IAT) sensor.
•
Oxygen (O
2
) sensor.
•
Bank Angle Senor (BAS).
•
Side stand sensor.
•
Clutch switch.
•
Neutral switch.
•
Vehicle speed sensor.
The DDFI system also analyzes how the engine performs
during a ride. It then stores his information internally so it will
be available for the next ride
The 1200 models utilize an interactive exhaust system which
has an electronically controlled actuator that activates a but-
terfly valve that controls exhaust flow in the dual-chamber
muffler. The Electronic Control Module (ECM) monitors engine
speed and throttle position while activating the valve. See
2.33 DTC P1470 (21), P1471 (21), P1477 (21), P1478 (21)
GENERAL
The Buell DDFI operates both as an open and closed loop
system which allows it to adjust for all possible operating con-
ditions. During open loop operation, the system utilizes pro-
grammed fuel and spark maps in the ECM which provide ease
of cold starting and maximum power at wide open throttle
(WOT). The adaptive fuel value which is "learned" during closed
loop operation is applied during open loop operation to adjust
fuel and spark maps for optimum performance.
During closed loop operation, the system relies on input from
the O
2
sensor to provide for the optimal air fuel mixture which
results in reduced emissions, good fuel economy and power.
In order for the system to enter closed loop operation, the fol-
lowing conditions must be met:
•
O
2
Sensor at operating temperature (Engine at normal
operating temperature).
•
Operation below 4000 RPM with engine under steady or
light load conditions.
By using both open and closed loop systems, engine perform-
ance is continuously tuned to compensate for changing condi-
tions and provide maximum performance.
FOR MORE INFORMATION
To learn more about the Buell DDFI system, read the following
topics in this section. A system diagram can be found in
.
Troubleshooting
•
•
2.4 CHECKING FOR TROUBLE CODES
•
2.5 CHECK ENGINE LAMP DIAGNOSTICS
•
•
2-2 2008 Buell XB Diagnostics: Engine Management
Содержание 2008 XB SERIES
Страница 1: ...2008 Buell XB Models Electrical Diagnostics Manual 99493 08Y 2007 Buell Motorcycle Company ...
Страница 4: ...Blank Text Here ...
Страница 6: ...NOTES ...
Страница 14: ...NOTES ...
Страница 50: ...NOTES ...
Страница 72: ...ed01568 Figure 2 16 Checking for Leaks 2 22 2008 Buell XB Diagnostics Engine Management ...
Страница 128: ...ed01338 Figure 2 61 Speedometer Tester Part No HD 41354 2 78 2008 Buell XB Diagnostics Engine Management ...
Страница 202: ...NOTES ...
Страница 224: ...A 22 2008 Buell XB Diagnostics Appendix A Connector Repair NOTES ...
Страница 225: ...SUBJECT PAGE NO B 1 CONNECTORS B 1 B 2 WIRING DIAGRAMS B 3 APPENDIX B WIRING DIAGRAMS ...
Страница 226: ...NOTES ...
Страница 232: ...Figure B 2 Figure B 2 Main Harness Ulysses and Lightning Main Harness Ulysses and Lightning ...
Страница 234: ...Figure B 3 Figure B 3 Main Harness Firebolt Main Harness Firebolt ...
Страница 236: ...Figure B 4 Figure B 4 Engine Management Circuit All Models Engine Management Circuit All Models ...
Страница 238: ...Figure B 5 Figure B 5 Lighting Circuit Ulysses and Lightning Lighting Circuit Ulysses and Lightning ...
Страница 240: ...Figure B 6 Figure B 6 Lighting Circuit Firebolt Lighting Circuit Firebolt ...
Страница 242: ...Figure B 7 Figure B 7 Component Circuits All Models Component Circuits All Models ...
Страница 244: ...Figure B 8 Figure B 8 Horn and Instruments Circuit All Models Horn and Instruments Circuit All Models ...
Страница 246: ...Figure B 9 Figure B 9 Starting Circuit Ulysses and Lightning Starting Circuit Ulysses and Lightning ...
Страница 248: ...Figure B 10 Figure B 10 Starting Circuit Firebolt Starting Circuit Firebolt ...
Страница 250: ...Figure B 11 Figure B 11 Charging Circuits All Models Charging Circuits All Models ...
Страница 252: ...Figure B 12 Figure B 12 Heated Handlebar Grips Ulysses only Heated Handlebar Grips Ulysses only ...
Страница 266: ...B 40 2008 Buell XB Diagnostics Appendix B Wiring Diagrams NOTES ...
Страница 267: ...SUBJECT PAGE NO C 1 METRIC CONVERSION C 1 C 2 FLUID CONVERSIONS C 2 C 3 TORQUE CONVERSIONS C 3 APPENDIX C CONVERSIONS ...
Страница 268: ...NOTES ...
Страница 272: ...C 4 2008 Buell XB Diagnostics Appendix C Conversions NOTES ...
Страница 273: ...SUBJECT PAGE NO D 1 GLOSSARY D 1 APPENDIX D GLOSSARY ...
Страница 274: ...NOTES ...
Страница 278: ...D 4 2008 Buell XB Diagnostics Appendix D Glossary NOTES ...
Страница 282: ...IV TOOLS NOTES ...
Страница 284: ...VI TORQUE VALUES NOTES ...
Страница 287: ...INSIDE BACK COVER GOES HERE ...
Страница 288: ...OUTSIDE BACK COVER GOES HERE ...