Operation Section
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Split Injection
- The purpose of split injection is to improve the startability of a cold engine. Before the conventional main injection
takes place, this function injects two or more extremely small injections of fuel.
Multi-Injection Control (Only for Some Models)
- Multi-injection control is when small injections (up to four times) are carried out before and after the main injection
in accordance with the state of the main injection and engine operation. This interval (the time A-D in the diagram
below) is based on the final injection quantity, engine speed, coolant temperature, and atmospheric pressure (map
correction). The interval during start-up is based on the coolant temperature and engine speed.
(6) Fuel Injection Pressure Control
• The engine ECU calculates the fuel injection pressure, which is determined by the final injection quantity and the en-
gine speed. The calculation is based on the coolant temperature and engine speed during start-up.
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Main Injection
Main Injection
Pilot Injection
Pilot Injection
Pilot Injection
Multi-Injection
This is the same as conventional
fuel injection.
Before the main injection, a small
quantity of fuel is injected.
If the temperature is low when the engine
starts, a small quantity of fuel is injected
divided over multiple injections before the
main injection.
Pre-Injection
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TDC
A
C
D
B
TDC (G) Pulse
Injection Rate
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Engine Speed
Final Injection Quantity
Rail Pressure
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