Bi-directional quickshifter Ī bi-directional quickshifter is a quickshifter that works on both directions of gearshift - upshifts and downshifts. Since the engine load is both reduced and reinstated in a precise and controlled manner (if tuned correctly) by the microcontroller, using a quickshifter is less damaging to the transmission than clutchless gear shifting without a quickshifter. To achieve this at least two separate control channels are required. To avoid a hard shock reaction on the chain drive, stand-alone modules can activate the cut cylinders in a staggered, controlled manner. After the shift is completed, the engine torque i.e., load needs to return to the level prior to the shift to continue accelerating. The load on the transmission is generally reduced (or " unloaded") by cutting off the ignition and/or fuel supply of the engine, or by disengaging the clutch. They can provide a near-perfect gear shift in tens of milliseconds. On modern motorcycles the engine management ECU itself performs the required calculations for the intervention. Often an after-market stand-alone module, separate from the engine control unit (ECU), is used on older motorcycles. The control module generally intervenes on the ignition and/or fuel supply to reduce the load on the transmission while shifting. The electronic sensor design is more complex and expensive but other than the above-mentioned advantages, may also be more reliable since it has no moving parts. In comparison with the mechanical type these relevant features ensure a more accurate, error free, shift detection for after-market applications, depending on rider preference, use case and set correctly, do reduce wear on the transmission gear selection system. A dedicated micro controller, either purposely part of the sensor system alone or fully integrated in a quick shift module, normally has the flexibility to both set the required upshift direction (push / pull) and force sensitivity to detect the correct shift moment. The design is typically linear (rod mounted) but can also be rotative (axle mounted). Mechanical, linear, sensors typically close a micro switch at a factory preset force level in one particular direction only.Ī more versatile sensor design uses a strain gauge, which effectively allows to measure the actual level of the applied force in any direction. Depending on the shift linkage design the sensor specifically reacts either on a push or pull action. The shift action by the rider, results in an actuation force on the sensor. Typically, the sensor is mounted in a way that it is a functional part of the gear shift linkage. However, the method of sensing and reducing the load can vary. Working mechanism Īlmost all quickshifters, used for upshifts on motorcycles, work on the same basis a sensor detects the gear shift action, a microcontroller processes the data (and calculates the timing) and typically cuts off ignition momentarily, resulting in a reduction of the load at the transmission allowing the engine speed to match the transmission speed of the next gear and permit the gear to slip (and engage) into place. This can increase the safety and comfort of the vehicle and allow for faster gear shifting (usually shifting in less than 50 milliseconds) and is thus a popular performance enhancement for motorcycles.
0 Comments
Leave a Reply. |