Patent ID: 7058491

Claim:
An abnormality detecting apparatus for wheel speed sensors detecting abnormality of wheel speed sensors arranged at each of driving wheels and idler wheels of a vehicle, wherein said wheel speed sensors detect rotational speeds of corresponding said driving wheels and said idler wheels, said abnormality detecting apparatus for wheel speed sensors comprises: a wheel speed calculating portion calculating wheel speeds of said driving wheels and wheel speeds of said idler wheels based on the detected rotational speeds of said driving wheels and the detected rotational speeds of said idler wheels, respectively; and an abnormality detecting portion detecting abnormality of said wheel speed sensors based on the calculated wheel speeds, wherein said abnormality detecting portion detects the abnormality of said wheel speed sensors based on: a first wheel speed that is at least one of the wheel speeds of said driving wheels and said idler wheels being substantially zero; at least one of the wheel speeds except for said first wheel speed being greater than a prescribed threshold value; and an average wheel speed of left and right said idler wheels being greater than an average wheel speed of left and right said driving wheels.