Sequential Auto Shift

Third-party ETS2LA plugin that shifts a sequential gearbox with a throttle-interpolated shift schedule, checks the shift against the truck's gear ratios before sending anything, and verifies that the gear actually changed.

How it decides

• Shift lines are interpolated across throttle travel, not a single fixed engine speed: Upshift RPM (no throttle) .. Upshift RPM (full throttle) and Downshift RPM (no throttle) .. Kickdown RPM (full throttle). The upshift line is capped at 97% of the truck's redline, so it can never demand a shift the engine would not reach.
• Every upshift is projected through the gear ratios. If the engine would land below Downshift RPM + Landing margin, the shift is skipped and the gear is held. Because the ratio span differs per gear, this produces per-gear shift points (short low gears are held longer, tall top gears shift early) and it removes 1-2-1 hunting at any throttle position.
• Every downshift is projected too, and skipped if the landing rpm would come out above 94% of redline.
• An upshift is still forced at 97% of redline, so a gear can never be held into the limiter.
• Braking suppresses upshifts but not downshifts, so the truck keeps walking down through the gears for engine braking; the retarder or engine brake being on also holds the gear.
• Downshifting into 1st is only allowed at a crawl, since 1st is a launch gear.
• Load and gradient are estimated from "throttle demanded but the truck is not accelerating" plus truck mass, and raise both lines when the truck is working hard (Adapt to load and gradient).
• Inputs use the throttle and brake the game actually applied (gameThrottle / gameBrake merged with the pedal values), so cruise control, ACC and other plugins are seen correctly.
• Shifts are verified. After a gear-up/gear-down pulse the plugin waits for the gear to change; it retries, and after three ignored requests it stops shifting for 20 s and raises a notification instead of pushing the truck through the gates.
• A gear change the plugin did not request, or clutch travel above the threshold, is treated as the driver taking over and pauses automatic shifting.
• Minimum time in gear counts from the shift that actually completed.

Notes

• ETS2/ATS must be configured so gearup and geardown control inputs work for the selected transmission mode. The plugin does not write a target gear; it simulates sequential shift button presses through ETS2LA's public output API. If the game ignores the pulses, the plugin notices and says so rather than repeating them forever.
• The status panel shows both shift lines, the projected landing rpm for the next gear, resistance, shift/veto/failure counters and the transmission mode reported by telemetry - enough to calibrate the schedule from one drive.
• Defaults are starting points for a typical stock truck. Tune Landing margin and the four RPM lines after testing with your truck.
• Settings live in %APPDATA%/ETS2LA/SequentialAutoShift.json. Version migrations only replace values that still match the default of the previous version, so tuned numbers survive updates.