Patent ID: 6128572
Filing Date: 2000-10-03
Classification: G01C,G01P

Abstract:
A vehicle direction correcting apparatus for correcting an output voltage of relative direction detecting means based upon a central point potential in the output voltage of said relative direction detecting means for detecting direction of a vehicle in such a manner that a drift error contained in said output voltage is eliminated, said apparatus comprising:first filter means for passing therethrough a low frequency component contained in the output voltage of said relative direction detecting means to thereby produce a first output voltage;second filter means having delay time different from that of said first filter means, for passing therethrough a low frequency component contained in the output voltage of said relative direction detecting means to thereby produce a second output voltage;voltage judging means for judging as to whether or not said first output voltage of the first filter means is made coincident with said second output voltage of the second filter means within a predetermined error range; andcontrol means for setting an output voltage of said relative direction detecting means as the central point potential in the case that said voltage judging means judges that said first output voltage is made coincident with said second output voltage within said predetermined error range.