Method and system for monitoring the proper operation of a debiting device

A method for monitoring correct operation of an electronic debiting appliance which is arranged in a vehicle and makes log entries on a mobile memory module in the context of a use accounting system for use of a road network or for entering a stipulated geographical zone by the vehicle, use of the road or geographical zone which is subject to charges being automatically recognized by the debiting appliance based on data which is held in a carried memory device and identifies the roads or geographical zones which are subject to charges, and based on data which can be received wirelessly in the vehicle from a navigation satellite system for purposes of determining a particular current geographical vehicle position, comprising the steps of:

• transmitting an “in order” signal from the vehicle if the debiting appliance is operating correctly;
• additionally recording identifying data for the uses section of the road network or of the entered geographical zone in the log entries on the mobile memory module, and also for the time of use, as a receipt;
• wirelessly addressing the debiting appliance by a control device arranged outside the vehicle;
• recording a time of address both in the control device and in the debiting appliance on a respective nonvolatile memory;
• additionally transmitting an appropriate status message wirelessly from the debiting appliance to the control operation;
• storing information in the control device, when there is no status message signaling correct operation of the debiting appliance, to identify the vehicle passing the control device and later subjecting the vehicle to a control;
• receiving data from the navigation satellite system in the control device;
• in addition to the time of address, recording the respective data received from the navigation satellite system at this time on the respective nonvolatile memory in both the control device and the debiting appliance;
• and checking to determine whether the navigation satellite system's data recorded in the nonvolatile memory in the vehicle at the time of address by the control device corresponds to the navigation satellite system's data recorded for this time by the control device itself during a later control on the debits entered on the mobile storage medium in the vehicle being controlled.