Move the gearbox shift lever up or down on command, faster and more repeatably than a driver's foot.
A dual-acting pneumatic cylinder on the shift lever, fed by two solenoids. On an upshift request the actuator is preloaded for 100 ms before torque reduction begins, which alone saves over 150 ms of shift time; on a downshift the same preload saves over 100 ms.
Full calculations are required for air cylinder bore sizing as well as line inner diameter. Pneumatic cylinder sizing is recorded as one of the last areas showing potential for significant improvement, with a test bench and a mathematical model in Excel, MATLAB or Simulink identified as the route to it.
Shift time measured on track: average 65 ms with closed-loop control against 85 ms without. Mock acceleration comparison: shift 1 full slip 87 ms, shift 2 partial slip 54 ms, shift 3 full traction 45 ms with closed loop, against 85 ms for all three without. The 1-2 shift is unlikely to go below 85 ms because of the extended lever travel between first and second.
Purchased.
Purchased pneumatic cylinder. From the cost report drawings and CAD: From the cost report drawings: Aluminum (Shift Lever Actuator).
None recorded. This part has no entry in Knowledge_Transfer/Issue Logging/Fault Vault.xlsx, in either Issue Log.xlsx, in CR22/Issue Tracking/Shakedown 7-15-23.xlsx, or in any design review issue list found in CrimsonStorage or Box.
Dimensions called out on the cost report drawings. These are the figures printed on the drawing, not a labelled specification; open the drawing itself for what each one refers to. Shift Lever Actuator (as drawn): 27.50, 2.75, 168.15, 16.81, 28.45, 2.84, 14.22, 1.42, 22.10, 2.21 Shift Lever Actuator Drawing (as drawn): 27.50, 2.75, 168.15, 16.81, 28.45, 2.84, 14.22, 1.42, 22.10, 2.21 Source: Cost report drawings: CR25/Powertrain/Design/Y - Cost Report Drawings/Shifting/Shift Lever Actuator.PDF; CR26i/Powertrain - IC/Design/Y - Cost Report Drawings/Shifting/Shift Lever Actuator Drawing.pdf; CR26i/Powertrain - IC/Design/Y - Cost Report Drawings/Shifting/Shift Lever Actuator.PDF; CR27i/.Powertrain/Design/Y - Cost Report Drawings/Shifting/Archive/Shift Lever Actuator Drawing.pdf and 1 more Quantity per car, as costed: 1
Nothing in CrimsonStorage covers these yet.