초록 ▼

A wireless, in-road traffic sensor system using sensors that are small, low-cost, and rugged. The sensors may be capable of measuring the speed of passing vehicles, identifying the type of passing vehicle and measuring information about roadway conditions, e.g., wet or icy. The sensor includes a wir

A wireless, in-road traffic sensor system using sensors that are small, low-cost, and rugged. The sensors may be capable of measuring the speed of passing vehicles, identifying the type of passing vehicle and measuring information about roadway conditions, e.g., wet or icy. The sensor includes a wireless transmitter and may be configured for installation beneath a roadway surface. The sensors may be configured as a traffic sensor system including distributed sensors across a roadway system, concentrators for receiving the sensor broadcasts and a central computer for accumulating and organizing the sensed information. The sensed information may also be made available responsive to user requests via the Web through such reports as traffic delays, alternate route planning and travel time estimates. Alternatively, the sensed information may also be used to control traffic through a traffic control means, such as a traffic signal.

대표청구항 ▼

A wireless, in-road traffic sensor system using sensors that are small, low-cost, and rugged. The sensors may be capable of measuring the speed of passing vehicles, identifying the type of passing vehicle and measuring information about roadway conditions, e.g., wet or icy. The sensor includes a wir

A wireless, in-road traffic sensor system using sensors that are small, low-cost, and rugged. The sensors may be capable of measuring the speed of passing vehicles, identifying the type of passing vehicle and measuring information about roadway conditions, e.g., wet or icy. The sensor includes a wireless transmitter and may be configured for installation beneath a roadway surface. The sensors may be configured as a traffic sensor system including distributed sensors across a roadway system, concentrators for receiving the sensor broadcasts and a central computer for accumulating and organizing the sensed information. The sensed information may also be made available responsive to user requests via the Web through such reports as traffic delays, alternate route planning and travel time estimates. Alternatively, the sensed information may also be used to control traffic through a traffic control means, such as a traffic signal. l system and a vehicle-speed control system is activated, a first setpoint variable being input during an activation of the at least one of the distance control system and the vehicle-speed control system, an engine of the motor vehicle being controllable as a function of the first setpoint variable, the device comprising: an arrangement for limiting at least one of the first setpoint variable and a derived value of the first setpoint variable to provide at least one of a limited setpoint variable and a limited derived value; an arrangement for setting a gear ratio as a function of the at least one of the limited setpoint variable and the limited derived value, in response to a first operating state and for setting the gear ratio as a function of the at least one of the first setpoint variable and the derived value in response to a second operating state; an arrangement for ascertaining another setpoint variable from an accelerator-pedal value using a nonlinear first engine characteristics map; an arrangement for ascertaining a virtual accelerator-pedal value from a second engine characteristics map by using the first setpoint variable when the at least one of the distance control system and the vehicle-speed control system is activated, and by using the another setpoint variable when the at least one of the distance control system and the vehicle-speed control system is not activated, an arrangement for setting the gear ratio as a function of the virtual accelerator-pedal value; wherein: a driver of the motor vehicle inputs an accelerator-pedal value representing the position of an accelerator pedal of the motor vehicle by operating the accelerator pedal; and the arrangement for limiting is operable for limiting an inverse accelerator-pedal value. 6. The device of claim 5, further comprising: an arrangement for ascertaining an actual quantity representing at least one of an instantaneous output torque and an instantaneous power output of an engine of the motor vehicle; and an arrangement for detecting the second operating state when the actual quantity deviates from the at least one of the first setpoint variable and the derived value, the second operating state existing when the at least one of the first setpoint variable and the derived value exceeds the actual quantity by a first threshold value; and wherein the first setpoint variable represents a setpoint value for at least one of an output torque and a power output of an engine. 7. The device of claim 6, wherein the second operating state exists when an absolute value of the actual quantity exceeds a second threshold value. 8. The device of claim 5, wherein: the second engine characteristics map is laid out inversely to the nonlinear first engine characteristics map.