Kubota L3901 Tractor Engine ECU Introduction

The engine ECU (1) controls the amount, timing,mixture and pressure of fuel that is injected. The engine ECU (1) operates each kind of control based on the signals from each type of sensor.

The actuator for controlling the amount, timing and mixture of fuel injection is the injector, while the actuator for controlling fuel pressure is the supply pump.

 

(1) Engine ECU (2) ECU Connector

 

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Fuel Quantity Control
The amount of fuel to be injected is determined using a basic injection amount, which is calculated based on the state of the engine and driving conditions, with corrections added for parameters such as water temperature, intake air temperature, intake pressure,etc.

Injection Timing Control
The ECU controls the timing for starting to energize the injectors, first determining the timing for the main injection and then setting the timing of other injections,such as pilot injections.

Fuel Mixture Control
By conducting a pilot injection, the initial fuel mixture is kept to a minimum, mitigating the explosive initial combustion and reducing NOx and noise.

Fuel Pressure Control
The ECU calculates the set fuel injection pressure based on the engine load (last injection amount and engine RPM) and controls the amount the supply pump supplies and the fuel pressure inside the rail.