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Reduces power during gear shift.

Note: Advanced features in combination with sequential gearbox control is also available.

 

Switch activation can be triggered by either a physical digital input or using the Internal output system.

 

 

Shiftcut

 

Enable shiftcut

How to activate shiftcut function.

enabled - Shiftcut functionality is always enabled.

enabled by digital input - Activation of the function requires the digital input function Shiftcut enable to be activated.

 

Shiftcut mode

Specifies the shiftcut control method

Timed pulse (shiftcut input) - When the digital input function shiftcut input is triggered, shiftcut function is activated during the cut time period.

Timed pulse with table (shuftcut input) - When the digital input function shiftcut input is triggered, shiftcut function is activated with a table, and also extra options to control the ramp back time, see shiftcut ignition retard options below.

Timed pulse from sequential gearbox control - Uses the shiftcut time table, where shiftcut can be stopped if a analog gear position sensor is fitted, see analog gear sensor feedback below.

Input controlled (shiftcut input) - When the digital input function shiftcut input is triggered, shiftcut function is activated as long as the shiftcut input is active.

Input controlled (clutch switch input) - When the digital input function clutch switch input is triggered, shiftcut function is activated as long as the clutch switch input is active.

shift force controlled (strain gauge) - Uses the AIN (0-5V) shift force sensor class to activate the shiftcut function.

 

Cut time

Specifies the time (in seconds) engine power is reduced (shiftcut).

 

Cut output

Specifies engine cut method to reduce power

Cut ignition - Only cut ignition.

Cut fuel - Only cut fuel.

Cut fuel and ignition - Uses both fuel and ignition cut.

Drop % with tables - Drop either fuel or ignition, or both with tables.

 

analog gear sensor feedback

Used to stop an ongoing shiftcut when an analog gear position sensor sends a valid "new gear" signal. Used to minimize the shiftcut time.

 

Gear Counter Feedback

Ends the shift cut as soon as the gear counter increases/decreases. Can be used with sequential and H-pattern transmissions.

Set the time table to the max time and let the gear counter feedback end the cut as soon as the shift is completed. Uses VSS GEAR as the gear source.

 

 

Shift force trigger settings

 

positive/NEGATIVE trigger force

Starts the shiftcut when the Shift Force analog input(shift force sensor) is above/below the set threshold. The length of the shiftcut is set by the shiftcut time table.

Gear Counter feedback / Analog Gear sensor feedback can be used to stop the cut as soon as possible.

 

auto-zero rate

The force signal is continuously zeroed to correct for sensor drift and small external forces.

 

re-trigger delay

The min allowed time between 2 shift triggers. Used to ignore short force pulses that can happen during or right after the shift.

 

 

Shiftcut conditions

 

Enable cut above TPS

Enable shiftcut activation only above this TPS value.

 

Enable cut above RPM

Enable shiftcut activation only above this RPM.

 

activation delay time

Specifies the time in seconds to delay the shiftcut function when the digital input shiftcut is triggered.

 

reactivation time

Specifies the reactivation time before any new shiftcut signal will be taken into account.

Note: any shiftcut signal will be discarded within the reactivation time.

 

max cut time

Specifies the maximum cut time (in seconds).

 

 

Shiftcut time (table)

 

Cut time

Specifies the time (in seconds) engine power is reduced (shiftcut).

 

 

Shiftcut ignition retard (and ramp back during time)

 

Retard angle

Extra options to retard timing during shiftcut.

 

hold time

A time table (in seconds) to hold the above retard angle ignition timing.

 

ramp back time

When the above hold time is reached, this table is used to ramp back the ignition advance to table values during the specified time.

 

Note: The retard and ramp back functions is used to smoothly increase power under a short period of time to let gearbox to "settle" and reduce torque.

 

 

Examples

 

Shiftcut mode: Timed pulse (shiftcut input).

clip0076

When Shiftcut input is triggered, in this example MaxxECU cuts ignition for 250ms if all conditions is valid for activation (over 5% TPS, over 1500RPM). Max cut time, fail-safe max cut time.

 

 

Shiftcut mode: Timed pulse with table (Shiftcut input) / Timed pulse from sequential gearbox control.

clip0077

When Shiftcut input is triggered, in this example MaxxECU cuts injection using the shiftcut time table when shiftcut conditions are met.

Note: You can always change axis sources, for example to use an external potentiometer, button or switch to alter shiftcut times.

 

Shiftcut mode: Input controlled (Shiftcut input/Clutch switch input).

clip0078

When Shiftcut input / clutch switch input is triggered, in this example MaxxECU cuts fuel injection during the period the input is triggered, but for maximum 3 seconds when Shiftcut conditions are met.

 

See also, sequential gearbox control.