Operation Section
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DM02VA, DM02P Diesel Engine
Introduction
The DM02VA, DM02P engine which is a high-power engine in compliance with the Stage5 and TIER4 Engine
Emissions Standard is provided with various systems. The DM02VA, DM02P engine is equipped with a turbo-
charger intercooler system that compresses and cools air and feed it to the intake manifold. Here, AMF sensor
and temperature/pressure sensors detect the air condition and transmit the data to the ECU which controls fuel
injection rate according to the engine load, speed and air quantity. Fuel is supplied to a high pressure pump
through a fuel filter. The fuel compressed in the high pressure pump is transferred to common rail and injected
by injectors in controlled order. Surplus fuel after injection returns to the fuel tank via a return hose. The exhaust
gas recirculation (EGR) system controls the quantity of recirculating air according to the engine speed and load
in order to comply with applicable exhaust gas emission standards.
The DOC (Diesel Oxidation Catalyst) uses a chemical process to reduce hydrocarbons (HC) and carbon
monoxide (CO). DPF (Diesel Particulate Filter) as after-treatment is the process by which the oxides of nitrogen
(NOx) contained in diesel exhaust are reduced to nitrogen (N2) and water (H2O).
The figure below shows the positions of the electronic control system and sensors.
NOTICE
It is normal to hear a slight operating sound after Key Switch On/Off.
This is the ECU checking the actuator before/after engine running.
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