Note: Refer HERE for a detailed explanation of Gear Shift Control settings (or click on a setting listed below).

Note: Examples of using Gear Shift Control are given HERE.

 

Gear Shift Control provides engine output torque control to assist with gear shifting. Gear Shift Controls primary function is to temporarily reduce torque during up shifts (gear cut) and increase torque output during down shifts (throttle blipping).

 

Gear Shift Control offers full configurability allowing it to be used in applications from a simple clutch switch based up shift cut right through to full closed loop control for clutch-less shifting of sequential dog gear boxes.

 

Gear Shift Control has provision for:

·Clutch switch based WOT up shifting,

·Determination of different shift types - Driven up shift, Overrun down shift, Driven down shift, Overrun up shift.

·Full set of adjustments for each gear and each shift type.

·Softened torque introduction for power shifts.

·Digital input, strain gauge and analog gear position sensor determination of requested gear shift.

·Closed loop shifting started from gear lever force or analog position sensor and ended by next gear engagement.

·Lockouts for RPM, speed, throttle position and trying to shift past the end of gear range.

·Reactivation lockout to prevent repeated shifts.

·Maximum down shift RPM to prevent over rev.

·Throttle blipping for down shifting using electronic throttle or an actuator. Blip for entire cut or blip end prediction to prevent overrun.

 

Gear Shift Control can be used with or without gear detection. To use closed loop gear shift control or to have per gear settings for shifts then gear detection must be set up. This is done under Chassis and Body -> Gear Detection. If no gear detection is used then the 0 cell is used in all tables. To fully benefit from Gear Shift Control it is recommended that gear position and gear ratios are correctly configured.

 

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Operation

The basic operation (and settings) of Gear Shift Control apply to the various stages of the shift process as shown in the following sections.

 

1 - Start Shift

The conditions that determine if a shift is being requested.

·RPM Lockout - Gear shift control will not operate below this Engine Speed.

·TP Low Lockout - Gear shift control will not operate below this Throttle Position.

·Speed Lockout - Gear shift control will not operate below this Driven Wheel Speed.

·End of Gears Lockout - If on prevents a shift start if trying to go outside the available gear range.

·Start Shift Validation Time - The conditions required to start a shift must be present for this long before a shift will start.

·Maximum Down Shift RPM - Prevents a down shift starting if engine speed is above this value.

·Start Shift Mode - Determines how the driver requests a gear shift.

·Digital Input

·Up Shift Digital Input - The digital input channel used to detect up shifts.

·Down Shift Digital Input - The digital input channel used to detect down shifts.

·Gear Lever Force (H or Seq)

·Gear Lever Force Offset - The voltage on the analog input when the strain sensor is unloaded.

·Gear Lever Force Gradient - The scaling from Volts to Newtons force for the strain sensor.

·Gear Lever Force Up Shift Force - The force required to trigger an up shift.

·Gear Lever Force Down Shift Force - The force required to trigger a down shift.

·Gear Barrel Position

·Start Shift Voltage Threshold - The voltage by which the gear position sensor must change to trigger an up or down shift.

 

2 - Shift Duration

The conditions present during the shift.

·Drive/Overrun TP - Used in combination with the condition that started the shift to determine which one of the four shift types has occurred.

·Driven Up and Down Shifts

·Driven Up/Down Shift Torque Reduction Time - The duration of the shift in Timed End Shift Mode.

·Driven Up/Down Shift Cut - The percentage of ignition or fuel events cut to reduce torque.

·Driven Up/Down Shift Ignition Trim - The ignition retard applied to reduce torque.

·Driven Up/Down Shift Fuel Trim - The fuel correction applied during the shift.

·Overrun Up and Down Shifts

·Overrun Up/Down Shift Torque Increase Time - The duration of the shift in Timed End Shift Mode.

·Overrun Up/Down Shift Throttle Trim - The increase in throttle position during the shift.

·Blip End Mode - Determines if the throttle trim is applied or prediction is used to end the blip early to prevent overrun.

·Blip Response Time - Used when Blip End Mode is set to Predictive to specify throttle response time.

 

3 - End Shift

The condition that determines a shift is complete.

·End Shift Mode - Specifies how the end of shift is determined.

·Max Shift Time - The absolute maximum time a shift can last.

 

4 - Post Shift

Torque introduction after the shift has been completed.

·Driven Up/Down Shift Torque Introduction Time - The time cut percent, ignition retard and fuel trim are reduced.

·Reactivation Timeout - The delay before the next shift can be started

 

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Runtime Values

Gear Shift Control provides the following runtime values to monitor status:

·Gear Shift Status - The current state of the Gear Shift Control system.

·Gear Shift Count - The number of gear shifts that have occurred.

·Gear Shift Last Shift Period - The time duration of the last gear shift.

·Gear Lever Force - Shows the current force applied to th strain lever.

·Gear Shift Ign Trim - Shows the real time ignition trim applied during shifts.

·Gear Shift Fuel - Shows the real time percentage fuel trim applied during shifts.