Emergency Engine Stop Function - Kubota V3600-E3 Shop Manual

V3-E3B SERIES, V3-E3CB SERIES, V3-E3BG SERIES, WSM

(4) Emergency Engine Stop Function

(1) Battery
(2) Key Switch
(3) Alternator L Terminal
1. Circuit design
The ECU consists of the following function: speed control, delay timer that serves to delay detection until the oil
pressure rises; sensor function that senses an oil pressure, water temperature or battery charge error and holds
the error status; emergency stop function that deactivates the delay timer and lock-in circuits and forces the ECU
to turn on.
2. Function details (See the block diagram.)
- Speed control
Rotational speed is constantly maintained at the prescribed level, even if the load changes, fuel control according
to isochronous control of the Proportional Solenoid.
- Delay timer function
The timer provides for a delay from the instant the starter is released to the instant the sensors get started. The
timer is activated by the voltage at the key switch's No. 50 terminal.
- Sensor function
This function serves to sense the oil pressure switch, water temperature switch, alternator L terminal and engine
speed sensor. If any of the 4 elements gets grounded for a specified time or longer, the function is activated to
hold this status.
- Emergency stop function
The function is used to deactivate the delay timer and force the engine to a stop.
3. Circuit behavior
For a certain time after the key switch has been set to the ST position to get the engine started, the oil pressure,
water temperature and battery charge status are not detected for an error and an emergency stop.
When the key switch has been returned from the ST to ON position (AC terminal active), the ECU gets ready for
error detection after a specified delay time.
If the key switch is placed to the OFF position or any of the water temperature, oil pressure switch, battery charge
circuit and engine speed sensor is detected, the ECU is activated to turn off the solenoid power.
(4) Oil Pressure Switch
(5) Water Temperature Switch
(6) Option
(7) Engine Speed Sensor
M-16
DIESEL ENGINE
(8) ECU
(9) Proportional Solenoid