SYSTEM / Control System Engine Control Dial Control, ECO Control Purpose: Controls the engine speed according to the rotation angle of engine control dial. (Engine control dial control) Reduces the engine speed to 1600 min -1 in order to reduce fuel consumption and noise level when all the control levers are in neutral. (ECO control) Engine speed is reduced to 1600 min -1 when the control levers are in neutral. Engine Speed Operation: 1. MC sends the signals equivalent to target engine speed to ECM by using CAN communication ac- cording to rotation angle of the engine control dial. 2. ECM controls the engine speed according to the signal received by using CAN communication. 3.
When the engine control dial is beyond 1600 min -1 and all the control levers are turned to the neutral position (all pressure sensors: OFF), MC changes the signal to send to ECM as 1600 min -1 after one second. 4. ECM reduces the engine speed to 1600 min -1 . Engine Con- trol Dial Posi- tion Slow Idle Fast Idle NOTE: MC sends the target engine speed to ECM every 10 ms (0.01 second). MC changes the data to send to ECM according to the status. NOTE: When the engine speed set by the engine control dial is slower than 1600 min -1 , the engine speed does not change as this speed is slower than the engine speed in ECO control.
This control is done regardless of whether the auto-idle control is done or not. The fast idle speed (P mode engine speed) of engine can be corrected by Dr. ZX. NOTE: The control (ECO control) in operation steps 3, 4 is deactivated by Dr. ZX tempo- rarily or permanently. T2-2-6