ELECTRIC CIRCUIT
5 - 12
CASE TRAINING CENTER
AUGUST 2000
2) Fuel consumption control
1. The engine electronic control box (6) calculates the target speed based on:
- working mode data sent via CAN communications from the main electronic control box (5),
- voltage signals from the acceleration control (3),
- voltage signals from the water temperature sender (10),
- voltage signals (starter motor switch 1) which feed the engine electronic control box.
2. The engine electronic control box calculates the fuel flow from the difference between the target speed (electronic
acceleration tachometric sender) and the real speed (engine speed detector 8),
3. The engine electronic control box converts the fuel flow at the target position of the electronic acceleration rack (7)
and corrects that target position in accordance with the regulating resistance (9).
3) Engine starting control
1. When the contact switch (1) is in the starting position the starting signal is sent simultaneously to the starter
motor and the engine electronic control box.
2. The engine electronic control box determines the fuel injection flow. This flow is determined from the water
temperature data and the real number of revolutions of the engine.
3. Once the starting signal is extinguished, the engine electronic control box changes from starting fuel control to
normal fuel injection flow control.
4) Engine stop control
When the engine stop signal is received (when the ignition switch is turned off or the emergency stop control is (2)
is operated), the engine electronic control box transmits the rack position signal "no injection" to the electronic
acceleration and activates the engine stop signal.
5) Electronic acceleration assistance error and emergency mode
1. The rack detector signal reaches the engine electronic control box.
2. The engine electronic control box compares the target position and the real position of the rack.
3. If the engine electronic control box determines that the rack is not in the correct target position, it will consider it to
be an assistance error and will stop the engine.
4. If the emergency mode is activated when an electronic acceleration assistance error occurs, the engine operates in
emergency mode (See "Emergency Mode" Section).
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