CONTROL FUNCTIONS (CONT’D)

Application Interface Outline (Cont’d)

Accelerator input selection

Accelerator sensors are available in three types: standard (analog voltage), backup (analog voltage) and CAN communication (communication command) types [Figure 10-40-6]. Using accelerator sensor setting flags allows combined use of these sensors.

In standard mapping (1), the main accelerator sensor is solely used. In generator standard mapping (O), selecting a contact input can switch the engine speed without the use of accelerator sensors.

In option mapping (2), a higher speed setting is selected from the main accelerator sensor input and the backup sensor input. If one of the two sensors fails, the other is used to control the engine speed.

In option mapping (3), the engine target speed is commanded via CAN communication.

In option mapping (4), the engine target speed is commanded via CAN communication, and if CAN communication fails, the main accelerator sensor input is used for engine speed control.

In option mapping (6), the lastly used speed setting is selected from the main accelerator sensor input and the backup sensor input.

Initially, the main accelerator sensor is prioritized. If one of the two sensors fails, the other is used to control the engine speed.

When an accelerator sensor failure is detected while the engine is running, either (1) a value immediately before the failure is used for engine speed control, or (2) a value set in the accelerator sensor failure flag is used for engine speed control, can be selected.

•A value immediately before the failure is used for engine speed control (standard) When an accelerator sensor fails while the engine is running, a value immediately before the failure is used for engine speed control. When an accelerator sensor fails while the engine is at rest, a value set in the accelerator sensor failure flag is used for engine speed control.

NOTE:When an accelerator sensor fails due to the gradual change of the accelerator sensor value to the acceleration side, there are cases in which the target speed is held at the high idling speed.Oppositely, when an accelerator sensor fails due to the gradual change of the accelerator sensor value to the deceleration side, there are cases in which the target speed is held at the low idling speed.

•The engine runs at a speed determined by the accelerator sensor failure flag (optional). The engine always runs at a speed determined by the accelerator sensor failure flag. When an accelerator fails while the engine is running, the engine target speed changes until the speed setting at the rate of 100min-1/s (default is 1500min-1 but it can be changed optionally).

NOTE:Depending on the operation conditions, an accelerator sensor failure may cause the engine to accelerate. Because the speed setting is a target speed, the actual speed is decided by the load factor of the engine.

The speed determined as an accelerator sensor failure flag can be selected from (1) low idling, (2) 1500min1(standard), (3) 1800min-1, and (4) engine stop.