Note: Refer HERE for a general overview of Gear Shift Control.
Note: Examples of using Gear Shift Control are given HERE.
Engine torque is reduced during driven shifts by one of the following methods.
·Ign % Cut - Ignition events will be cut to limit engine torque.
·Fuel % Cut - Fuel events will be cut to limit engine torque.
Gear Shift Control will not begin a shift sequence unless Engine Speed is above this value. This setting can be set to 0 to disable RPM lockout. Gear Shift Status will display RPM Low Lockout when this lockout is active.
Gear Shift Control will not begin a shift sequence unless Throttle Position is above this value. This setting can be set to 0 to disable TP lockout. Gear Shift Status will display TP Low Lockout when this lockout is active.
Gear Shift Control will not begin a shift sequence unless Driven Wheel Speed is above this value. This setting can be set to 0 to disable speed lockout. Gear Shift Status will display Speed Lockout when this lockout is active.
Prevents a gear shift sequence occurring if the driver is trying to up shift from top gear or down shift from first gear. For the end of gears lockout to function correctly, a driver request input that can detect up shift and down shift is required (ie bidirectional strain lever, two digital inputs or gear position sensor). As up shifts and down shifts can not be detected on an H pattern shifter, this function applies to sequential gear boxes only. Options are:
·OFF - End of gears lockout is not used.
·ON - Shift sequence will be prevented from starting if the driver attempts to shift outside the available gear range.
The number of the highest gear is set in the Chassis and Body -> Gear Detection -> Number Gears setting.
Gear Shift Status will display End Of Gears when this lockout is active.
The conditions required to start a shift must be present for this long before a shift sequence will begin. This effectively provides filtering on the drivers shift request signal. Depending on the type of sensor used for the drivers shift request, validation time has a slightly different meaning:
·Digital Inputs - The shift request digital input (either Up Shift or Down Shift) must be Active for the validation time before a shift sequence will start.
·Strain Lever - Gear Lever Force must be above Gear Lever Force Upshift Force or below Gear Lever Force Downshift Force for the validation time before a shift sequence will begin.
·Gear Position Sensor - The gear position sensor voltage must be above the normal voltage for the current gear plus the Start Shift Voltage Threshold for the validation time to start an up shift OR gear position sensor voltage must be below the normal voltage for the current gear minus the Start Shift Voltage Threshold for the validation time to start a down shift.
Typical value 20-50 ms.
Prevents a down shift from starting if the current engine speed is above this value for the current gear. This is to prevent over-rev when down shifting by delaying a down shift until it can be safely achieved. The value used for this setting applies to the gear being shifted out of. Eg if the 3rd gear RPM is 5000, a down shift out of third gear will be prevented until RPM falls below 5000. Enter a high value in this table to prevent it from being used if required. For the maximum down shift RPM to function correctly, a driver request input that can detect up shift and down shift is required (ie bidirectional strain lever, two digital inputs or gear position sensor)
Gear Shift Status will display RPM High Lockout while a down shift is being prevented.
Determines how the driver requests a gear shift.
·OFF - Gear Shift Control is disabled.
·Digital Input - One or two digital inputs are used to indicate the driver is requesting to shift gears. This mode should be used if the gear lever is fitted with an up and down shift micro switch OR when using a clutch switch.
·Gear Lever Force (Seq) - A strain gauge is fitted to the gear lever on a sequential box and can determine up and down shifts.
·Gear Lever Force (H) - A strain gauge is fitted to the gear lever on an H pattern gear shifter. In this mode up shifts and down shifts can not be directly detected due to H pattern. Up shifts and down shifts are determined using gear lever force and Throttle Position.
·Gear Barrel Position - An analog sensor is fitted to determine gear position. A gear shift request is determined by the sensors voltage change when force is applied to the lever. Sequential gear boxes only.
This setting works in combination with End Shift Mode to determine the conditions that start and end a shift sequence.
Controls what conditions are used to determine when a shift sequence has completed.
·Time - The shift will end at a fixed time after it has started. This option is used when there is no means to determine when a shift has ended. Shift duration is set in the Driven Up Shift Torque Reduction Time, Driven Down Shift Torque Reduction Time, Overrun Up Shift Torque Increase Time and Overrun Down Shift Torque Increase Time tables.
·Digital Input - The shift will end when the digital input that started the shift is no longer active. Use this option to keep the shift active the whole time the request digital input is active. Use this option for a clutch switch activated shift. This mode is only relevant when Start Shift Mode is set to Digital Input.
·Gear Barrel Position - The shift sequence ends when it is determined that the gearbox has selected the next gear. This provides closed loop shifting.
This setting works in combination with Start Shift Mode to determine the conditions that start and end a shift sequence.
This setting is only available when Start Shift Mode is set to Digital Input.
Selects the Digital Input that is used to indicate the driver has requested an up shift. When using a clutch switch to indicate shift request, set this to the digital input wired to the clutch switch. When using a gear lever with micro switches, set to the input wired to the up shift micro switch (sequential gear boxes only).
This setting is only available when Start Shift Mode is set to Digital Input.
Selects the Digital Input that is used to indicate the driver has requested a down shift. When using a clutch switch to indicate shift request, this must be set to OFF. When using a gear lever with micro switches, set to the input wired to the down shift micro switch (sequential gear boxes only).
This setting is only available when Start Shift Mode is set to Gear Lever Force (Seq) or Gear Lever Force (H).
Selects which Analog Input is being used for the Gear Lever Force measurement.
This setting is only available when Start Shift Mode is set to Gear Lever Force (Seq) or Gear Lever Force (H).
Sets the voltage offset for when the strain gauge gear lever is in its unloaded state. Most signal conditioned strain gauge gear levers have an unloaded output of approx 2.5 V.
This setting is only available when Start Shift Mode is set to Gear Lever Force (Seq) or Gear Lever Force (H).
Sets the scaling from Volts to Newtons force for the strain sensor. Use the Gear Lever Force runtime value to see the real time scaled force applied to the lever.
Note: A negative value will reverse the direction of the force.
Note: that it is not necessary to exactly calibrate the sensor to display actual Newtons force. In fact, with most strain levers this is not possible and will vary depending on where the lever is pulled. Instead it may be desirable to calibrate the lever to display for example 100 N when the driver is pulling it much harder than normally required for shifting.
Gear Lever Force Up Shift Force - The force required to trigger an up shift.
This setting is only available when Start Shift Mode is set to Gear Lever Force (Seq) or Gear Lever Force (H).
This value determines the amount of force required to indicate that the driver is requesting an up shift.
Gear Lever Force Down Shift Force
This setting is only available when Start Shift Mode is set to Gear Lever Force (Seq) or Gear Lever Force (H).
This value determines the amount of force required to indicate that the driver is requesting a down shift.
This setting is only available when Start Shift Mode is set to Gear Barrel Position.
The voltage by which the gear position sensor must vary from its normal in gear voltage before it is decided that the driver is requesting a shift.
Used in combination with the drivers request to start a shift, this setting determines which one of the four possible shift types has occurred. If Throttle Position is greater than this value then it is assumed that the shift is being made under power (drive), otherwise it is assumed that the shift is being made during overrun.
Possible shift types are:
·Driven Up Shift - Changing up gears under power.
·Overrun Up Shift - Changing up gears during overrun.
·Driven Down Shift - Changing down gears under power.
·Overrun Down Shift - Changing down gears during overrun.
Note depending on the Start Shift Mode, not all of these shift types can be achieved. For example, on an H pattern box with a strain lever or with a clutch switch initiated shift, only these shift types can be achieved:
·Driven Up Shift
·Overrun Down Shift
Driven Up Shift Torque Reduction Time and Driven Down Shift Torque Reduction Time
These settings are only available when End Shift Mode is set to Timed.
Sets the time duration that cut, retard and fuel trim will be applied for during driven shifts to reduce engine torque. The table value used is the one corresponding to the gear being shifted out of (the gear used before the start of shift).
Driven Up Shift Cut and Driven Down Shift Cut
The percentage of ignition or fuel events cut to reduce torque during driven shifts. The table value used is the one corresponding to the gear being shifted out of (the gear used before the start of shift).
Driven Up Shift Ignition Trim and Driven Down Shift Ignition Trim
The ignition retard applied to reduce torque during driven shifts. The table value used is the one corresponding to the gear being shifted out of (the gear used before the start of shift).
Driven Up Shift Fuel Trim and Driven Down Shift Fuel Trim
The fuel correction applied during driven shifts. The table value used is the one corresponding to the gear being shifted out of (the gear used before the start of shift).
Overrun Up Shift Torque Increase Time and Overrun Down Shift Torque Increase Time
These settings are only available when End Shift Mode is set to Timed.
The duration of the torque increase (throttle blip). The table value used is the one corresponding to the gear being shifted out of (the gear used before the start of shift).
If a dog box is being used a throttle blip either through E-throttle or a blip solenoid is needed for both overrun up shifts and overrun down shifts to disengage the dogs before the shift can be performed. Rev-matching can also be performed for a downshift but a blip is required for both.
Overrun Up Shift Throttle Trim and Overrun Down Shift Throttle Trim
The increase in throttle position during the shift for torque increase (throttle blip). This is added to the current throttle position. The table value used is the one corresponding to the gear being shifted out of (the gear used before the start of shift).
Set these values to 0 to prevent the use of throttle trim.
Determines if the throttle trim is applied for the entire duration of the shift or prediction is used to end the blip early to prevent overrun. Options are:
·Shift End - The throttle trim is removed once the shift has completed.
·Predictive - The rate of RPM increase is monitored to determine when the throttle trim should be removed. This mode requires a correctly filled out Gear Ratio Table.
Used when Blip End Mode is set to Predictive to specify throttle response time.
Typical value is 40-80 ms.
Used to select the auxiliary output being used for the blip solenoid.
The absolute maximum time a shift can last. If the end of shift condition has not occurred after this long since the shift start then the shift is ended and torque reintroduction begins (if required). This prevents the engine getting permanently stuck in a torque reduction or torque increase should the input signals fail.
Driven Up Shift Torque Introduction Time and Driven Down Shift Torque Introduction Time
After a shift has been completed (end shift condition met), if torque has been reduced, it can be introduced again gradually to prevent a sudden torque increase. This value sets the time duration of the torque introduction. A larger number will result in a softer torque introduction. Set the value to 0 to immediately return the engine to full power. The table value used is the one corresponding to the gear being shifted out of (the gear used before the start of shift). During the torque introduction time, cut, ignition retard and fuel trim are progressively reduced.
Gear Shift Status will display Torque Introduction while a down shift is being prevented.
The delay before the next shift can be started. This delay begins from the end of the torque introduction. This prevents accidental repeated shifts or can be used to ensure there is a minimum amount of time between shifts.