Method and apparatus for monitoring off-duty times of a driver

A driver assistance system (1) for a vehicle (2), comprising:

• a tracking module (10) configured to track on-duty time intervals, during which the vehicle is operated, and off-duty time intervals, during which the vehicle is not operated or is operated for personal use;
• a calculation module (20) configured to calculate a start time, which indicates to the driver how much off-duty time the driver still needs to spend and/or a stop time, which indicates to the driver how much on-duty time the driver has remaining, the calculation module (20) being further configured to:
• obtain on-duty time intervals and off-duty time intervals of a driver, wherein each off-duty time interval comprises a workshift reset time interval having a first minimum length and/or an extra off-duty time interval having a second minimum length, wherein the first minimum length is greater than the second minimum length,
• initialize a required extra off-duty time interval with a predefined value,
• scan the off-duty time intervals to identify any extra off-duty time intervals that have a length more than the second minimum length and less than the first minimum length,
• subtract any extra off-duty time intervals identified in the scanning step from the required extra off-duty time interval to obtain a first residual required extra off-duty time,
• if the first residual required extra off-duty time interval is greater than 0, analyze the workshift reset time interval and determine if the workshift reset time interval comprises an extra off-duty time interval, which cannot be used as the workshift reset time interval,
• subtract the analyzed extra off-duty time interval from the first residual required extra off-duty time interval to obtain a second residual required extra duty-off time,
• if the second residual required extra off-duty time interval is greater than 0, analyze the workshift reset time interval and shift, at least partly, the workshift reset time interval from today to tomorrow to create extra off-duty time interval today,
• subtract the created extra off-duty time interval from the second required extra off-duty time interval to obtain a third residual required extra duty-off time interval,
• monitor whether the third residual required extra off-duty time interval is greater than 0,
• sum the extra off-duty time intervals, compare the sum to the third residual extra off-duty time interval and output a warning if the sum is not greater than the third required extra off-duty time interval, and
• output a warning if the third residual required extra off-duty time interval is greater than 0,
• wherein the calculated start time and/or stop time depends on duration and times of previously-tracked on-duty and off-duty time intervals;
• and
• an output module (30), configured to output the start time and/or stop time to the driver.