Patent ID: 9075076
Filing Date: 2015-07-07
Classification: B62J,G01C,G01P

Abstract:
1. A sensor apparatus ( 1 ) for determining both a cadence of a crank ( 15 , 15 ′) and a travelling speed of a bicycle, comprising: a. a housing ( b. an accelerometer ( c. a wireless transmitter ( d. a power source ( wherein the accelerometer ( 4 ), the wireless transmitter ( 6 ) and the power source ( 8 ) are contained in the housing ( 2 ), and wherein the housing ( 2 ) comprises an attachment means ( 3 ) arranged for attaching the housing ( 2 ) to a wheel ( 11 , 11 ′) of the bicycle, and wherein the sensor apparatus ( 1 ) further comprises a first means arranged for determining the cadence from the rate at which consecutive changes of polarity occur in the first signal, or from the rate at which consecutive positive and negative extreme values occur in the first signal, and a second means arranged for determining the travelling speed from the rate at which consecutive maximum and minimum peak values occur in the second signal.