Low Level Function
5.15.1.6 Detect Road Surface State in Host Vehicle vicinity

Overview

This Function shall be capable of providing the following facilities:

(1) The ability to take responsibility for processing information from sensors that detect the state of the road surface near to the Host Vehicle, i.e. the Vehicle in which it is operating.
(2) The ability to process the sensor data to determine if road surface is good, or if not what is the problem (e.g. slippery, broken) and why (e.g. oil spill, ice, mud, worn).
(3) Once processing is complete, the ability to send the data in digital form to the Determine and store local Host Vehicle Conditions Function.

Functional Requirements

(a) continuously monitor the flow of input data
(b) analyse the data in (a) to determine the state of the road surface immediately around the host vehicle
(c) where the road surface state is found to be less than good, determine the reason, e.g. ice, rain, oil, mud.
(d) if necessary convert the results from (b) and (c) into digital data
(e) whenever the state of the road surface changes and/or at other intervals, send the results of (d) to the Determine and store local Host Vehicle conditions function in the local vehicle road surface conditions data flow.

Diagrams

The Diagram(s) is (are) the diagram(s) where you can find the function :
  • DFD 5.15.1 Provide Detection for the Vehicle Surroundings
  • Functional Tree of Area 5

    • Parent Higher Level Function

    Input logical dataflows

    Output logical dataflows

    User needs

    Number

    Description

    7.4.1.37
    Hazardous Location Notification - The system shall be able to warn driver, via an in-vehicle device, of adverse driving conditions ahead (e.g. slippery road, low visibility, queuing traffic) and advise on the appropriate action (e.g. speed).
    7.4.1.38
    Hazardous Location Notification - The system shall be able to warn drivers, via a road-side device, of adverse driving conditions ahead (e.g. slippery road, low visibility, queuing traffic) and advise on the appropriate action (e.g. speed).
    7.4.1.40
    Hazardous Location Notification - The system shall be able to warn the driver, via an in-vehicle device, that the host vehicle is about to enter a section of road whose surface has less grip than normal (low "mu").
    7.4.1.45
    Hazardous Location Notification - The system shall be able to estimate the condition of the road surface in the vicinity of the host vehicle and send warnings to other vehicles.
    7.4.1.46
    Hazardous Location Notification - The system shall be able to estimate the condition of the road surface in the vicinity of the host vehicle and send warnings to a road-side device.
    7.4.1.7
    (X)FCD - The system shall be able to infer XFCD, i.e. the road conditions (e.g. reduced friction, aquaplaning) and traffic conditions (e.g. vehicle breakdown, traffic incident), from the state of the host vehicle systems’ data (e.g. speed, acceleration, brakes, lights).