Cruise Control
When active, the Cruise Control function controls the Drive By Wire Throttle in an attempt to maintain the vehicle speed at the set target speed. This function uses a single analogue input, with each button that is pressed resulting in a different resistance to signal ground.
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Wiring Tab
Options
Input Type
The Input Type must be set to analogue voltage
Enable Light Output Type
Select from the following:
Disabled
No output is used for the Cruise Control Enable Light
Digital - Switched
To be selected if the Cruise Control Enable Light is controlled from a Digital Pulsed Output (DPO) from the ECU
CAN Output - Switched
To be selected if the Cruise Control Enable Light is controlled via the vehicle CAN bus
Active Light Output Type
Select from the following:
Disabled
No output is used for the Cruise Control Active Light
Digital - Switched
To be selected if the Cruise Control Active Light is controlled from a Digital Pulsed Output (DPO) from the ECU
CAN Output - Switched
To be selected if the Cruise Control Active Light is controlled via the vehicle CAN bus
Connections
Input
The Cruise Control function uses a single analogue input where each button being pressed results in a different resistance to signal ground. An AVI (Analogue Voltage Input) or SPI (Synchronised Pulsed Input) should be used.
To make your own, simply have each switch connect a unique resistor between the AVI/SPI and Signal Ground. Ensure that the voltage readings are suitably far apart (minimum 0.1V).
AVI
An AVI (Analogue Voltage Input) is suggested.
Pull up
Enables a 1k pull up resistor to 5V.
Typically the pull up should be enabled for a cruise control input switch. If the input is being shared with another ECU, such as with a piggyback installation with an OEM ECU, then the other ECU will generally include a necessary pull up and this setting should be set to Disabled.
SPI
An SPI (Synchronised Pulsed Input) can be used where there are no available AVIs.
Sensor Type
Set to Hall Effect for all analogue inputs
Pull up
Enables a weak 10k pull up resistor to 5V.
Typically the pull up should be enabled for a cruise control input switch. If the input is being shared with another ECU, such as with a piggyback installation with an OEM ECU, then the other ECU will generally include a necessary pull up and this setting should be set to Disabled.
Enabled Output
The Cruise Control Enable Light is illuminated whenever the Cruise Control State is anything except Disabled. Select an available output wire, typically a DPO (Digital Pulsed Output) or Stepper Output that will be connected for the Enabled Light.
Active State
Controls the whether the output 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)
Active Output
The Cruise Control Active Light is illuminated whenever the Cruise Control State is Cruising, Accelerating or Coasting. Select an available output wire, typically a DPO (Digital Pulsed Output) or Stepper Output that will be connected for the Active Light.
Active State
Controls the whether the output 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)
General Tab
General
Minimum Speed
The minimum speed at which Cruise Control will function. If the vehicle speed falls below this value while cruise control is active, cruise control will disable. If the vehicle speed falls below this value, cruise control can not be set or resumed. Typically, OEM ECUs set this value to approximately 40 km/h (25mph).
Maximum Speed
The maximum speed at which Cruise Control will function. If the vehicle speed exceeds this value while cruise control is active, cruise control will disable. If the vehicle speed exceeds this value, cruise control can not be set or resumed.
Speed +/- Increment
How much the target speed will change with each short press of the Accel or Coast buttons
Buttons Tab
Unknown
Any button number which isn't needed should have it's function set to Unknown.
Rest Position
Used to distinguish between a valid and invalid input. Calibrate with no button pressed.
Voltage
The voltage read by the ECU from the switch when no button is pressed. Typically the voltage will be between 4 and 5 Volts while in the Rest Position.
Calibrate
By leaving the buttons unpressed and pressing Calibrate, the calibration voltage will be automatically set.
Enable
If state is Disabled this will change it to Ready
Voltage
The voltage read by the ECU from the switch when the Enable Button is pressed
Calibrate
By holding down the Enable button and pressing Calibrate, the calibration voltage will be automatically set.
Disable
Sets cruise control state to Disabled.
Voltage
The voltage read by the ECU from the switch when the DISable Button is pressed
Calibrate
By holding down the Disable button and pressing Calibrate, the calibration voltage will be automatically set.
Enable / Disable
Enable / Disable button is a push-on push-off button. If the cruise control state is Disabled, pressing this button will change the state to Ready, otherwise it sets cruise control state to Disabled.
Holding the button for the long press duration will disable cruise control.
Voltage
The voltage read by the ECU from the switch when the Enable / Disable Button is pressed
Calibrate
By holding down the Enable / Disable button and pressing Calibrate, the calibration voltage will be automatically set.
Cancel
If state is Cruising: Pauses Cruise Control by setting state to Ready.
Voltage
The voltage read by the ECU from the switch when the Cancel Button is pressed
Calibrate
By holding down the Cancel button and pressing Calibrate, the calibration voltage will be automatically set.
Set
If Cruise Control state was Ready: changes to Cruising and sets the current speed as the target speed.
Also sets the current speed as the target speed (this also works while cruising to change your target speed).
Voltage
The voltage read by the ECU from the switch when the Set Button is pressed
Calibrate
By holding down the Set button and pressing Calibrate, the calibration voltage will be automatically set.
Set / Cancel
If Cruise Control state was Ready: changes to Cruising and sets the current speed as the target speed.
If state is Cruising: Pauses Cruise Control by setting state to Ready.
Voltage
The voltage read by the ECU from the switch when the Set / Cancel Button is pressed
Calibrate
By holding down the Set button and pressing Calibrate, the calibration voltage will be automatically set.
Accel
If Cruise Control state was Cruising: Holding the button will cause the car to continue accelerating until the user releases the button. The target speed becomes the speed that the car was travelling at when the button was released.
Voltage
The voltage read by the ECU from the switch when the Accel Button is pressed
Calibrate
By holding down the Accel button and pressing Calibrate, the calibration voltage will be automatically set.
Coast
If Cruise Control state was Cruising: Holding the button will cause the car to coast until the user releases the button. The target speed becomes the speed that the car was travelling at when the button was released.
Voltage
The voltage read by the ECU from the switch when the Coast Button is pressed
Calibrate
By holding down the Coast button and pressing Calibrate, the calibration voltage will be automatically set.
+ / -
If Cruise Control state was Cruising: A short press increases/decreases the target speed by the value of the Speed +/- Increment setting.
Voltage
The voltage read by the ECU from the switch when the + or - Button is pressed
Calibrate
By holding down the + / - button and pressing Calibrate, the calibration voltage will be automatically set.
Set / Accel / +
If Cruise Control state was Ready: changes to Cruising and sets the current speed as the target speed.
If Cruise Control state was Cruising: A short press increases the target speed by the value of the Speed +/- Increment setting. Holding the button will cause the car to continue accelerating until the user releases the button. The target speed becomes the speed that the car was travelling at when the button was released
Voltage
The voltage read by the ECU from the switch when the Set / Accel / + Button is pressed
Calibrate
By holding down the Set / Accel / + button and pressing Calibrate, the calibration voltage will be automatically set.
Set / Coast / -
If Cruise Control state was Ready: changes to Cruising and sets the current speed as the target speed.
If Cruise Control state was Cruising: A short press decreases the target speed by the value of the Speed +/- Increment setting.
Holding the button will cause the car to coast until the user releases the button. The target speed becomes the speed that the car was travelling at when the button was released
Voltage
The voltage read by the ECU from the switch when the Set / Coast / - Button is pressed
Calibrate
By holding down the Set / Coast / - button and pressing Calibrate, the calibration voltage will be automatically set.
Resume
If Cruise Control state was Ready: changes to Cruising and the target speed gets set to the last valid target speed. Note that this will do nothing if the user has not pressed Set since key on.
Voltage
The voltage read by the ECU from the switch when the Resume is pressed
Calibrate
By holding down the Resume button and pressing Calibrate, the calibration voltage will be automatically set.
Resume / Cancel
If Cruise Control state was Ready: changes to Cruising and the target speed gets set to the last valid target speed. Note that this will do nothing if the user has not pressed Set since key on.
If state is Cruising: Pauses Cruise Control by setting state to Ready.
Voltage
The voltage read by the ECU from the switch when the Resume / Cancel is pressed
Calibrate
By holding down the Resume / Cancel button and pressing Calibrate, the calibration voltage will be automatically set.
Resume / Accel / +
If Cruise Control state was Ready: changes to Cruising and the target speed gets set to the last valid target speed.
If Cruise Control st ate was Cruise: a short press increases the target speed by the value of the Speed +/- Increment setting.
Holding the button will cause the car to accelerate until the user releases the button. The target speed becomes the speed that the car was travelling at when the button was released
Voltage
The voltage read by the ECU from the switch when the Resume / Accel / + Button is pressed
Calibrate
By holding down the Resume / Accel / + button and pressing Calibrate, the calibration voltage will be automatically set.
Resume / Coast / -
If Cruise Control state was Ready: changes to Cruising and the target speed gets set to the last valid target speed.
If Cruise Control state was Cruise: a short press decreases the target speed by the value of the Speed +/- Increment setting.
Holding the button will cause the car to coast until the user releases the button. At that point the target speed gets set to whatever the current speed is.
Voltage
The voltage read by the ECU from the switch when the Resume / Coast / - Button is pressed
Calibrate
By holding down the Resume / Coast / - button and pressing Calibrate, the calibration voltage will be automatically set.
Resume / Coast / Cancel
If Cruise Control state was Ready: changes to Cruising and the target speed gets set to the last valid target speed. Note that this will do nothing if the user has not pressed Set since key on.
Holding the button will cause the car to coast until the user releases the button. At that point the target speed gets set to whatever the current speed is.
If state is Cruising: Pauses Cruise Control by setting state to Ready.
Voltage
The voltage read by the ECU from the switch when the Resume / Coast /Cancel is pressed
Calibrate
By holding down the Resume / Coast / Cancel button and pressing Calibrate, the calibration voltage will be automatically set.
Common Button Settings
Voltage Tolerance
The voltage amount added either side of the calibrated voltage for each button. For example, if the voltage received by the ECU falls within this distance from the calibrated voltage for a particular button position, the button is assumed to be pressed.
Long Press Time
The amount of time a button must be in a depressed state for before the secondary long-press functions are enabled.
Associated Tables
Tuning Settings
Under ECU Navigator>Cruise Control>select Tuning Settings
Max Control System Error
This value (speed in km/h) signifies the error limit (+/- this value) that is used to calculate the control system error. Where the control system error is the target speed minus the current speed. This is used to reduce any aggressive acceleration when resuming cruise control from a speed far below the target.
Max Throttle Ramp Rate
This is the maximum rate at which the throttle will open of close while cruise control is active. This is to ensure ensures acceleration from far below the target is comfortable, deceleration from far above the target is comfortable. Lower values will also be easier on the suspension and transmission components.
Proportional Gain
Under ECU Navigator>Cruise Control>select Proportional Gain
Tuning Tips
The Proportional Gain controls the magnitude of response to speed error when cruise control is active. A higher Proportional Gain will result in more throttle and a faster response, however may become unstable. High Proportional Gain when close to target speed can cause subtle hunting (and consequently some motion sickness). A Proportional Gain of 1000 gives 1% throttle per 1 km/h of speed error.
Integral Gain
Under ECU Navigator>Cruise Control>select Integral Gain
Tuning Tips
The Integral Gain controls the response to speed error over time. A greater amount of time spent not at target speed will cause an increasing throttle response. Integral Gain is necessary to properly achieve your target speed, as acts to fully eliminate any error over time. A higher Integral Gain will result in a faster throttle response, though too high will cause overshoot of the target speed. An Integral Gain of 1000 gives 1% throttle per 1 km/h of error sustained over one second.
Derivative Gain
Under ECU Navigator>Cruise Control>select Derivative Gain
Tuning Tips
The Derivative Gain dampens the rate of change of the error, decreasing the throttle response as to not accelerate too rapidly toward the target speed, and therefore reduces the chance of overshooting the target speed. A higher Derivative Gain will take away more throttle, and thus Proportional and Integral Gains can be higher before the controller becomes unstable. However, higher Derivative Gain when close to target can cause subtle hunting (and consequently some motion sickness). A Derivative Gain of 1000 takes away 1% throttle per 1 km/h speed increase sustained over one second.
Associated Channels
Cruise Control State
Indicates whether the cruise control is Disabled; Ready; Cruising; Accelerating; or Coasting
Cruise Control Disable Reason
If something is preventing Cruise Control from being active; this channel will show why.
Cruise Control Input State
Shows which input buttons are currently being pressed.
Cruise Control Target Speed
Shows the target speed if Cruising; Accelerating or Coasting. Shows 0 if Disabled or Ready
Cruise Control Speed Error
Shows the difference between the current speed and target speed if Cruising; Accelerating or Coasting. This is used for the PID control.
Cruise Control Output
How much the Cruise Control is attempting to open the Drive By Wire Throttle
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