Patent ID: 7178953
Filing Date: 2007-02-20
Classification: B60Q

Abstract:
1. A vehicle headlight optical axis control unit comprising: inclination angle detecting means for detecting an inclination angle in a longitudinal direction of a vehicle; headlight driving means for tilting an optical axis of at least one headlight of the vehicle up and down; and control means for calculating a cumulative sum of a variable number of measured values of the inclination angle sampled by said inclination angle detecting means during running of the vehicle, and for adjusting an angle of an optical axis of the headlight by operating said headlight driving means according to a cumulative average value of the inclination angle obtained by averaging the cumulative sum, wherein the inclination angle detecting means comprises an inclination angle detecting sensor directly measuring the inclination angle between the vehicle and a road surface at one point, and wherein under assumptions that K(n) is a measured value of the inclination angle at nth sampling, and M is a specified positive integer, said control means calculates the cumulative sum ΣK(n)=ΣK(n−1)+K(n) and the average value=ΣK(n)/n when n≦M, and calculates the cumulative sum ΣK(n)=ΣK(n−1)−ΣK(n−1)/M+K(n) and the average value=ΣK(n)/M when n is greater than M.