Engine General Information And Diagnosis; General Description; Injection Timing Description - Suzuki VLR1800 Service Manual

1A-1 Engine General Information and Diagnosis:

Engine General Information and Diagnosis

Engine

Injection Timing Description

Injection Time (Injection Volume)
The factors to determine the injection time include the basic fuel injection time, which is calculated on the basis of the
intake air pressure, engine speed and throttle opening angle, and various compensations. These compensations are
determined according to the signals from various sensors that detect the engine and driving conditions.
Compensation of Injection Time (Volume)
The following different signals are output from the respective sensors for compensation of the fuel injection time
(volume).
Signal
ENGINE COOLANT TEMPERATURE SENSOR
SIGNAL
INTAKE AIR TEMPERATURE SENSOR SIGNAL
OXYGEN SENSOR SIGNAL
(For E-02, 19, 24, 33)
BATTERY VOLTAGE SIGNAL
STARTING SIGNAL
ACCELERATION SIGNAL/DECELERATION
SIGNAL

General Description

When engine coolant temperature is low, injection time (volume)
is increased.
When intake air temperature is low, injection time (volume) is
increased.
Air/fuel ratio is compensated to the theoretical ratio from density
of oxygen in exhaust gasses. The compensation occurs in such a
way that more fuel is supplied if detected air/fuel ratio is lean and
less fuel is supplied if it is rich.
ECM operates on the battery voltage and at the same time, it
monitors the voltage signal for compensation of the fuel injection
time (volume). A longer injection time is needed to adjust injection
volume in the case of low voltage.
When starting engine, additional fuel is injected during cranking
engine.
During acceleration, the fuel injection time (volume) is increased,
in accordance with the throttle opening speed and engine rpm.
During deceleration, the fuel injection time (volume) is decreased.
Descriptions
B822H11101001
I718H1110268-03