Trans-Brake

Trans-Brake

The Trans-Brake function allows the Elite ECU to control a trans-brake in an automatic transmission. The Trans-Brake allows the engine to develop full power without that power being transmitted into the drive-train. This is achieved by using a trans-brake solenoid, which locks the transmission into both first and reverse gears simultaneously, locking the output of the transmission.

This function can be used in a drag racing situation, where the driver can use the trans-brake to assist in the staging process. Due to the significant delay in the time it takes for a vehicle to reach maximum launch power (where the trans-brake can then be released), there is a Bump and Creep function included within the Trans-Brake Settings. Bumping/Creeping allows for the vehicle to roll while still maintaining maximum launch power. Bumping or Creeping is achieved by pulsing the trans-brake solenoid on and off at a certain frequency and duty cycle - a ‘Bump’ is a predetermined time that the ECU will pulse the output to the solenoid, and a ‘Creep’ is a user-controlled time where the ECU will pulse the output to the solenoid. The driver can start this process on the first beam (the pre-stage) and then ‘bump’ or ‘creep’ the vehicle into the 2nd beam (full stage).

Wiring Tab

Options

Trans-Brake Control

Select which mode of Trans-Brake Control is desired.

Not Used

Select when the Trans-Brake is not to be used

Input Only

Select when only an input is to be used for the function

Input and Output

Select when both an input and an output is to be used for the function

Bump Box Function

Not Used

Select when neither the Bump nor the Creep function are to be used

Bump

Select when only the Bump function is to be enabled

Creep

Select when only the Creep function is to be enabled

Connections

Trans-Brake Input

Select an appropriate input to use for the Trans-Brake input. An AVI (Analogue Voltage Input) or an SPI (Synchronised Pulsed Input) should be used.

SPI

An SPI (Synchronised Pulsed Input) requires configuring of the edge and the type of Sensor to be connected.

Edge Select

Falling is used when the input is grounded when the switch is activated. Rising is used when the input is supplied voltage when the switch is activated.

Sensor Type

Set to Hall Effect for all switch inputs

Pullup

Enables a pullup if required to generate a voltage when the switch is off.

AVI

An AVI will require Switch On and Switch Off voltages to be configured so the Elite ECU can know which voltages on the AVI meet the conditions required.

Switch On Voltage

The voltage either above or below where the switch is considered to be ON. When selecting an appropriate value some consideration should be given to allow for voltage fluctuations.

Switch Off Voltage

The voltage either above or below where the switch is considered to be OFF. When selecting an appropriate value some consideration should be given to allow for voltage fluctuations. Eg. if the switch is at 5V when it is Off and is grounded to 0V when the switch is On, you would set the On voltage to 1.0V and the Off Voltage to 4.0V.

Example 1

The switch is at 5V when it is Off and is grounded to 0V when the switch is On. Correct settings with tolerance would be to set the On voltage to 0.5V and the Off Voltage to 4.5V. i.e. when the voltage falls below 0.5V it is considered to be ON, and when it rises back above 4.5V it is considered to be OFF.

Example 2

The switch is at 2.5V when it is OFF, and is at 12V when it is ON. Correct settings with tolerance would be to set the On Voltage to 4.5V and the Off Voltage to 3.0V. i.e. when the voltage rises above 4.5V it is considered to be ON, and when it falls back below 3.0V it is considered to be OFF.

Bump/Creep Input

Select an appropriate input to use for the Bump/Creep input. An AVI (Analogue Voltage Input) or an SPI (Synchronised Pulsed Input) should be used.

Bump/Creep Output

Select an available output wire, typically a DPO (Digital Pulsed Output) or Stepper Output that will be connected for the Bump/Creep Output.

NOTE: The current from the ECU will not be sufficient to support the trans-brake solenoid, thus it is necessary to use the ECU output to trigger a relay (solid state if being used for bump/creep) that then operates the solenoid.

Active State

Controls the whether the output to the solenoid is normal or inverted. Low will ground the output wire when the output is set to be On. Setting to High will invert this signal, with the output wire being grounded when the output is set to be Off, and not grounded when it is set to be On. (Default = Low)

Trans-Brake Output

Select an available output wire, typically a DPO (Digital Pulsed Output) or Stepper Output that will be connected for the Trans-Brake Output.

NOTE: The current from the ECU will not be sufficient to support the trans-brake solenoid, thus it is necessary to use the ECU output to trigger a relay (solid state if being used for bump/creep) that then operates the solenoid.

Active State

Controls the whether the output to the solenoid is normal or inverted. Low will ground the output wire when the output is set to be On. Setting to High will invert this signal, with the output wire being grounded when the output is set to be Off, and not grounded when it is set to be On. (Default = Low)


Settings Tab

Settings

RPM Limiter Method

Select the cut method you wish to use for the Trans Brake RPM Limiter

None

Disables the RPM Limiter

Fuel

Fuel injection outputs will be cut to limit engine power.

Ignition

Ignition outputs will be cut to limit engine power. This is the more common method

RPM Limit

The RPM limit that is applied when the Trans-Brake function is enabled

Delay

The Delay between releasing the trans-brake input and releasing the trans-brake output .

Bump/Creep Frequency

The output frequency when the Bump/Creep button is pressed

Bump Time

The Time which the Bump output is active when the Bump button is pressed.

Trans-Brake Enable Condition

This allows setting of the ECU condition to activate the Trans-Brake function.

Select

Select the ECU channel to be used.

Maths

A selection of Equal To, Not Equal To, Greater Than, Less Than, Greater Than Or Equal To, Less Than Or Equal To that is to be used.

Value

The value the maths must meet to enable the condition.



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