Installation method and an apparatus of a sensor based on strain gauges to generate deformation signals caused by an applied force

An installation method comprising:

• providing a vehicle including a frame, an axle fixed to the frame in a non-movable manner relative to the frame, a hub rotatable on the axle, a pedal rotatably mounted to the frame, and a driving chain extending between the pedal and the hub, with the frame including a right chain stay, wherein the chain stay includes first and second elongated portions integrally connected at a bend having an obtuse angle between the first and second elongated portions;
• and
• installing a strain gauge sensor at an installation location of the right chain stay situated on a side surface facing the hub and spaced from the axle and the pedal, wherein the strain gauge sensor spans between the first and second elongated portions and over the obtuse angle of the bend, with the strain gauge sensor generating a deformation signal measuring a pushing/pulling force applied by the driving chain, with the installation location of the strain gauge sensor satisfying the following conditions:
• Condition 1:
• when the pushing/pulling force is applied by the pedal to the installation location of the vehicle, the installation location is deformable and a deforming action force is directly proportional to the pushing/pulling force;
• Condition 2:
• when the pushing/pulling force is applied, the vehicle deforming direction at the installation location is independent to a pushing/pulling force moving direction;
• and
• Condition 3:
• a strain detecting direction of the strain gauge sensor is in a same direction as a vehicle deforming direction at the installation location.