CONTROL FUNCTIONS (CONT’D) Application Interface Outline (Cont’d) Accelerator filter The accelerator filter regulates the trade-off between acceleration/deceleration time and overshoot/undershoot during acceleration or deceleration. This feature is factory set appropriately at Bobcat, but a higher priority may have to be given to either the reduction of acceleration/deceleration time or the suppression of overshoot/undershoot depending on the engine applications. [Figure 10-40-46] shows the effect of the accelerator filter. The accelerator filter delays reaching the engine target speed, thereby avoiding overshoot and undershot while trading off the speed responsibility of the engine. By advancing the engine target speed change, the motion responsiveness at the time of engine acceleration/ deceleration can be improved. When the adjustment requirement is admitted in the engine application test in regard to the stabilization and responsiveness of engine speed mentioned above, Bobcat makes the adjustment to change the model-specific control map by this adjustment.
Figure 10-40-46 [Accelerator straight]
Over shoot
Target Speed
Engine Speed
Actual Speed
adapt α and β by installation test
Time Longer rise time
[Accelerator filter]
Engine Speed
β
α Time
10-40-42 90 of 182
E55W, E60, E80 Electronic Control System Manual
