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. Quickshifter on a BMW S1000RR motorcycle.Ī quickshifter (or quick shifter) is a device that eliminates the need to use the clutch or throttle when shifting gears on a manual transmission.
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