Patent ID: 7213452
Filing Date: 2007-05-08
Classification: B60C

Abstract:
1. A device for mounting on a wheel for monitoring a physical variable of the wheel fitted on a vehicle, the device comprising: an electrical energy source being an electrical energy storage device for supplying other components with electrical energy; a sensor for ascertaining the physical variable; a transmitter for transmitting a radio message containing data supplied by said sensor; an operations detector for generating an operation signal indicating whether the vehicle is moving, said operations detector simultaneously being a generator converting mechanical energy into electrical energy and feeding the electrical energy into said electrical energy source; a control device connected to said electrical energy source, said sensor, said transmitter and said operations detector, said control device configured for disconnecting said electrical energy source electrically from said sensor and/or said transmitter and for placing said sensor and/or transmitter in an energy saving mode for reducing energy consumption when the vehicle is not moving; and an evaluation device connected to said control device and to said generator, said evaluation device being able to calculate on a basis of the electrical energy output from said generator and its variability with time a digital or continuous wheel rotation signal serving as a criterion for an operational status of the vehicle.