ANTI-stall protection table which defines:
- above what RPMs (row 2) GCU will force activation of take-up table regardless if accelerator pedal is pressed or not (ALSO USED IN CLOSED LOOP TAKEUP)
- below what RPMs (row 1) GCU will use take-up table values (used for low speed take-up mode reactivation, and also won’t allow to use clutch pressure tables below those RPM even if clutch slip exists no more),
- below what RPMs (row 0) GCU will disengage take-up mode and go into idle mode (ALSO USED IN CLOSED LOOP TAKE-UP).
Advice: Row 2 is also used to trigger take-up table if car starts to roll, or is still rolling while (usually when stopping). Makes coasting re-entering take-up speeds way nicer avoiding dropping RPMs to idle while still in motion (of course if take-up pressures are high enough to maintain drive delivery)
Good idea is to set row 0 to RPMs just below idle RPM, row 1 around 300-400 RPMs higher, and row 2 just above stable idle point 🙂
Frequent issue #1: Take-up is late and very harsh.: Increase values around idle and up to the point where harsh engagement happens. It means that drivetrain has insufficient take-up pre-load.
Frequent issue #2: Take-up bouncy – RPMs jump high, and then suddenly fall trying to pull away.: Idle pre-load is too low. Inhibit engine will to rev with additional clutch engagement
Frequent issue #3: After take-up when I brake engine stalls.: Values below idle are too high, decrease them gradually as RPMs drop to take load off from the engine. Adjust anti-stall table.
Frequent issue #4: Rapid take-up is slipping extensively: Until clutch slip is closed (exists no more) in take-up state GCU will be applying clutch pressure according to take-up table. Frequent mistake is making RPM axis ending with too low RPMs. Being anywhere above highest RPMs in take-up mode will still use pressures from last row. Make sure to make RPM axis ending with higher than usually met RPMs and apply clutch pressures that would cause full clutch engagement (f. eg. RPM axis 800, 1000, 1200 (…) 2200, 2400, 3000, 4000, 5000 and knowing that take-up takes place anywhere between 1000 and 2500 rpms apply more pressure for higher RPMs, so if for take-up transmission requires around 10-20% pressure then for higher RPMs apply i.eg. 40%, 60%, 80% for additional protection in case of extensive clutch slip during take-up).
Jump to -> Take-up
