Patent ID: 11912311
Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLC
Field: Transport (Mechanical engineering)
Classification: CPC B | IPC B

Claim 6:
7. The method of claim 1, wherein determining whether the movement of the target vehicle in the lane meets at the least one predetermined condition for being the erratic vehicle includes:
determining whether a Condition A is True and at least one of: a Condition B, a Condition C, and a Condition D is True, wherein:
the Condition A=True when [Kthrsh0>=ABS(ΔXtgt)>=Kthrsh1]
the Condition B=True when {ABS(Δytgt)>=Kthrsh2 AND freqtgt,lane,cntr>=Kthrsh3}
the Condition C=True when Std(vtgt-vlane,avg)>=Kthrsh4 
the Condition D=True when Δttgt,btwn,LaneChange<=Kthrsh5]
wherein:
Δxtgt=Longitudinal distance to the target vehicle;
Δytgt=Lateral distance of a center line of the target vehicle from a centerline of the lane;
vtgt=Target vehicle longitudinal speed;
vlane,avg=Target vehicle average lane speed;
freqtgt,lane,cntr=Detected frequency of the centerline of the target vehicle crosses over the centerline of the lane;
Δttgt,btwn,LaneChange=Detected elapsed time period between lane change of the target vehicle;
Kthrsh0=Minimal effective external sensor range that is a calibratable threshold (distance) as functions of host vehicle velocity;
Kthrsh1=Maximum effective external sensor range that is a calibratable threshold (distance) as functions of host vehicle velocity;
Kthrsh2=Predetermined calibratable threshold (distance) of the centerline of the target vehicle from the centerline of the lane;
Kthrsh3=Predetermined frequency of the target vehicle is moving over the centerline of the lane;
Kthrsh4=Predetermined threshold of the target vehicle velocity variance; and
Kthrsh5=Predetermined threshold time between the target vehicle lane changes.