Determining The Final Injection Duration - Yamaha XV1700PCRC Service Manual

Determining the final injection duration

The intake air volume determines the basic injection duration. However, at a given intake air vol-
ume, the volume of fuel that is required varies by the engine operating conditions such as accelera-
tion or deceleration, or by weather conditions. This system uses various sensors to precisely check
these conditions, applies compensations to the basic injection duration, and determines the final
injection duration based on the operating condition of the engine.
Intake air pressure
Engine rpm
Degree of
opening of
throttle
The fuel is cut off under conditions that do not require fuel, in order to stop the injection.
È
É
1 Injection at start *1
2 After-start enrichment *2
3 Warm-up enrichment *3
4 Acceleration compensation *5
5 Fuel cut-off Deceleration
compensation *5
6 Basic injection duration
Basic injection
quantity
Composition of final injection duration
Ê Ë
Ñ
Ð
1
2
3
6
7 Voltage compensation duration
È RPM
É Injection duration
Ê Cranking
Ë Warm-up
Ì Idle
1 - 19
FEATURES
Atmospheric
Battery voltage
pressure
Compensation
Engine Intake air
temperature temperature
Ì Í Î Ï
4
5
7
Í Acceleration
Î Constant
Ï Deceleration
Ð Start
Ñ After start
GEN
INFO
Injection
command
Ì