Operation Section
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(3) Fuel Injection Quantity Control
General Description
• This control determines the fuel injection quantity by adding coolant temperature, fuel temperature, intake air temper-
ature, and intake air pressure corrections to the basic injection quantity. The engine ECU calculates the basic injection
quantity based on the engine operating conditions and driving conditions.
Injection Quantity Calculation Method
• The calculation consists of a comparison of the following two values: 1. The basic injection quantity that is obtained
from the governor pattern, which is calculated from the accelerator position and the engine speed. 2. The injection
quantity obtained by adding various types of corrections to the maximum injection quantity obtained from the engine
speed. The lesser of the two injection quantities is used as the basis for the final injection quantity.
Q000887E
Engine Speed
Engine Speed
Accelerator Opening
Injection
Quantity
Injection
Quantity
Accelerator Opening
Engine Speed
Basic Injection Quantity
Maximum Injection Quantity
Low
Quantity
Side Selected
Corrected
Final Injection
Quantity
Injector Actuation
Period Calculation
Individual Cylinder
Correction Quantity
Intake Air Pressure Correction
Atmospheric Pressure Correction
Cold Engine Maximum Injection Quantity Correction
Ambient Temperature Correction
Intake Air Temperature Correction
Speed Correction
Injection Pressure Correction
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