DEVICE FOR DECIDING SPACE BETWEEN REAR SIDE OF AUTOMOBILE AND OBJECT LOCATED BEHIND AUTOMOBILE, AND DEVICE AND METHOD FOR STABILIZING COMBINATION VEHICLES

摘要

PROBLEM TO BE SOLVED: To provide a cost-effective device and method that both detect or prevent rocking movement of a trailer coupled to an automobile. SOLUTION: This device for deciding a space between a rear side 1a of an automobile 1 and an object or trailer 2 located behind the automobile 1 comprises ultrasonic sensors 3 for generating sensor signals indicative of a space between at least one place on the automobile rear side 1a and one place on that side 2a of the object 2 which faces the automobile 1, and an evaluator 4 for deciding the space value on the basis of the generated sensor signals. The evaluator 4 has means for determining the frequency characteristic of the decided space value.