Tomtom Global Content B.v.

Other

Tele Atlas N.v.

Tomtom Germany Gmbh & Co. Kg

Tomtom Belgium N.v.

Robert Joannes Van Essen

Volker Hiestermann

Stephen T'Siobbel

Edwin Bastiaensen

Claus Dorenbeck

Probe data collected at times of low traffic density is analyzed to derive a Raw Road Design Speed Limit (RRDSL,) for each road segment or group of segments in a digital map. The RRDSL (), comprised of longitudinally distributed speeds, is associated with the road segment and stored in a digital medium to indicate the limits of the road section in free flow traffic. The longitudinally distributed speeds may be limited by local speed limits or other business logic to establish a Legal Raw Road Design Speed Limit (LRRDSL,). Either the RRDSL () or the LRRDSL () can be further modified to smooth acceleration and deceleration rates between changes in the longitudinally distributed speeds to create an Optimal Longitudinal Speed Profile (OLSP,), which represents optimized energy consumption. A signal can be produced if a driver's current speed rises unacceptably above a longitudinally distributed speed in real time. The signal can be audible, visible and/or haptic. Real-time traffic density information can be inferred by comparing current speed data to the longitudinally distributed speed for that position. If the current speed is consistently lower than the longitudinally distributed speed for that position, an inference is drawn that the road section is inefficient. Road efficiency assessments can be transmitted to a service center and/or other vehicles, and used by navigation software.

Method for creating speed profiles for digital maps

Probe data is analyzed to derive Longitudinal Speed Profiles (LSPs) and an Optimal Longitudinal Speed Profile () for each road segment or link in a digital map network. The Longitudinal Speed Profiles (LSPs) profiles are calculated during defined time spans whereas the Optimal Longitudinal Speed Profile () is based on the LSP for the time span corresponding only to free flow traffic conditions. All of the LSPs can used to create a respective energy cost for each time span, or only the OLSP () can be used (or alternatively the RRDSLor LRRDSL) to calculate an energy cost for the free flow conditions only. The energy cost can be used to predict the energy required by a vehicle to traverse the link. Navigation software can use the energy cost to plan the most energy efficient route between two locations in the digital map. Sensory signals can be activated if a driver strays from the Optimal Longitudinal Speed Profile () to achieve extremely high levels of energy efficiency.

Method for computing an energy efficient route

System for protecting data on a data carrier on which is stored an accessible medium code and data only accessible after presenting an access code, comprises: a) an apparatus incorporating, a programmed processor, a user interface, a mobile telephone incorporating a SIM-card, b) a central station incorporating a further programmed processor cooperating with a number of memories storing valid medium SIM and access codes. The processor can be connected through the telephone and a suitable communication network to the further processor in the central station whereby the SIM-code of the telephone and the medium code of the carrier are transferred to the further processor to be processed into an access code. The resulting combination of codes is compared with codes stored in memories, and in case of a valid code combination a coded access permission is sent to the processor enabling the software to read data from the data carrier.

System for securing data on a data carrier

Growing community of inventors

Amsterdam, Netherlands

Robert Joannes Van Essen