Method for monitoring the operation of a traffic signal system and traffic control traffic signal system

摘要

Method for monitoring the operation of a traffic signal system (30) with a number of signal generator units (26), in particular traffic signal generator units (26), each comprising a light emitting device (1) with a number of light emitting semiconductor devices (3) and a control circuit (2) for control a flux current (IL) through the light emitting device (1), wherein in this method to the driver circuit (2) of the signal generator unit (26) from a light signal control device (31) emitted signal generator current (IS1, IS2, IS3) for evaluating the function of the light emitting device (1) is monitored by means of a function monitoring unit (35) and wherein the flux current (IL) is controlled by the light emission device (1) by a method comprising the following method steps: - determination of a first characteristic value (UL2) having a forward voltage (UL) represented at the light emission device (1), - determination ei second characteristic value (UIL), which represents the flow current (IL), - determination of a control value (PA) from the first characteristic value (UL2) and the second characteristic value (UIL), - provision of a reference value (PR) for the control value (PA) In that the control value (PA) approaches the reference value (PR) and / or substantially reaches the reference value (PR), wherein a functional restriction of at least one light emitting device (1) located in the signal transmitter unit (26) ) is detected by the fact that the signal generator units (26) emitted signal generator current (IS1, IS2, IS3) reaches or falls below a predetermined limit value (ISG1, ISG2, ISG3) or reaches or exceeds a predetermined limit.