SWL Series Skid Steer Loader
33
12) Water temperature combined instrument（4F） The instrument uses CAN bus
communication to obtain the display of engine water temperature, speed, fault
flashover code and so on. The dial calibration is linearized by using digital
processing method with microcontroller as the core and driving pointer of imported
stepper motor. The pointer deflection angle is 240 degrees, and the control error is <
0.5 degrees. The dot matrix LCD display can display the working time, the rotational
speed can be displayed when the rotational speed is greater than 600 rpm/min, and
the fault code will be preferentially displayed when the engine fault flashing code
alarm is received.
13） Control of diesel particulate filter (DPF) system
The engine ECU determines the PM accumulation status from information from each
sensor and sets regeneration or
cleaning level and timing.
1. Automatic active regeneration
When the PM level reaches 1, the engine ECU performs regeneration control to burn the
PM that has been accumulated.
If the DOC temperature (value of exhaust gas temperature sensor T0) is 250 ℃ (482 ℉)
or higher, the engine ECU gives instruction to the injector to perform post injection.
Unburned fuel is combusted in the DOC raising the exhaust gas temperature to 550 ℃
(1022 ℉) or higher and combusting the PM in the DPF.
If the DOC temperature is less than 250 ℃ (482 ℉), the fuel will not burn even if a post
injection is performed so post injection is not performed.
Therefore, regeneration is also not performed.
If the DOC temperature is 550 ℃ (1022 ℉) or higher, the PM combusts on its own so
post injection is not performed (Passive regeneration state).
In addition, if auto regeneration is not completed within specified time while in PM level
2 state, the engine ECU requests parked regeneration.
2. Parked active regeneration
When the PM level reaches 3, the engine ECU sends a warning to the machine on which it
is equipped to perform parked regeneration and commands output restriction.
During parked regeneration, pre-programmed operation processes are performed
automatically.
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