For anything you'd like to see added to Speeduino
By commrace
#5039
Can launch control be implemented with the use of speed input ?
i was thinking like multiple rev limit maps with an analog multistage switch .
for example if :
switch is on 0 possition - analog input 0v - no launch control ( normal rev limit )
switch is on 1 position - analog input 1v - launch control (rev limit) set at x value ( like 4200rpm)
switch is on 2 position - analog input 2v - launch control (rev limit) set at y value ( like 5000rpm)

all depending on VSS ( vehicle speed signal )
if input from vss missing use rev limit map 0,1,2 ( wich one is selected from switch )
if input from vss is greater than 5 km/h ( mph) whitch to base rev limit map

Thank you!
kind regards
Alex M
User avatar
By PSIG
#32151
Launch Control and power/flat-shift currently use RPM threshold as input. In the current form, you do not need a multi-position switch in order to have multiple rev-limit points. Only a single-position on/off switch and the clutch switch or button is necessary, and rev-limit is established by the switch-point set in TunerStudio.
commrace wrote:
Mon Jan 11, 2016 9:23 pm
switch is on 0 possition - analog input 0v - no launch control ( normal rev limit )
With an on/off switch, this "off" position simply deactivates the function.
commrace wrote:
Mon Jan 11, 2016 9:23 pm
switch is on 1 position - analog input 1v - launch control (rev limit) set at x value ( like 4200rpm)
In the "on" position, the system is armed, and waits for either a button or clutch press to activate. If switched at under the set threshold, it will hold the engine at ~4200 (or other selected) limit, until the clutch or button is released for launch.
commrace wrote:
Mon Jan 11, 2016 9:23 pm
switch is on 2 position - analog input 2v - launch control (rev limit) set at y value ( like 5000rpm)
This switch position is not used, and instead the threshold of a higher limit is set in TS. With the switch "on", the engine RPM is increased to the point you want it held, and the clutch or button pressed. The RPM will then hold at that selected point until the clutch or button is released. Note the order of switching may be reversed to same effect. ;)

The function does not care what the vehicle speed is in order to accomplish either mode at any time. Code could be modified to enable a VSS or other input to determine the threshold activation or RPM set-point. You would have to study the code to determine how you would modify it for the use parameters you desire. Alternatively, the VSS could be to or through a separate device, that simply outputs the on/off switch function automatically to Speeduino at the speed you select.

David

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