Method and apparatus for generating and indicator of a risk level in operating systems
A method and apparatus for generating an indicator of a risk level in motor vehicle and notifying vehicle systems when a risk level is above a specific threshold includes, receiving a plurality of driver distraction indicators, assigning a weighting value to each indicator, applying a scaling factor to the weighting value assigned to those indicators which are identified as being related, and summing the weighting values to produce an output value indicating a risk level. Distraction indicators can include on-board system and sensor outputs and stored data relating to driver attributes. Related indicators may comprise those distraction indicators relating to environmental conditions (eg. rain and low ambient light levels), or to vehicle performance to driver concentration level (eg. in-car phone and navigation system). The scaling step allows the weighting process to be refined based on the status of other received indicators.
1. An apparatus for generating an indicator of a risk level in an operating system, the apparatus comprising:
a first module arranged to receive a plurality of distraction indicators, wherein at least one of said distraction indicators is designated as being related to at least one other of said distraction indicators;
a memory for storing weighting values;
a second module arranged to assign a stored weighting value to each of said distraction indicators;
a third module arranged to identify distraction indicators which are related;
storage circuitry for storing scaling factors;
a fourth module arranged to modify the weighting values assigned to those distraction indicators which are identified as being related; and
a summer for summing the weighting values to produce an output value indicating a risk level.
2. The apparatus of claim 1 further comprising: a comparator arranged to compare the output value with a predetermined threshold value, and if the threshold value is exceeded, generate a modified output signal indicating a risk level.
3. The apparatus of claim 1 wherein related distraction indicators comprise at least two distraction indicators relating to environmental conditions, or to system performance, or to an operator concentration level.
4. The apparatus of claim 1 wherein a received distraction indicator is assigned a weighting value which is dependent on the degree to which the distraction indicator constitutes a risk.
5. The apparatus of claim 1 wherein a distraction indicator comprises at least one selected from a group consisting of a vehicle on-board sensor output, a vehicle driving condition indicator output, stored data relating to vehicle driver attributes, a vehicle on-board navigation system output.
6. A vehicle comprising the apparatus of claim 1 .
7. The apparatus according to claim 1 wherein the apparatus is implemented in an integrated circuit.