초록 ▼

A vehicle navigator for calculating a running distance of a vehicle from output data of an acceleration sensor, an increase of accumulated errors during the calculation of the vehicle running distance being suppressed. The vehicle navigator has an acceleration sensor for detecting an acceleration of

A vehicle navigator for calculating a running distance of a vehicle from output data of an acceleration sensor, an increase of accumulated errors during the calculation of the vehicle running distance being suppressed. The vehicle navigator has an acceleration sensor for detecting an acceleration of the vehicle; a velocity calculator for calculating a first velocity of the vehicle on the basis of an acceleration detected by the acceleration sensor; a GPS receiver for receiving radio waves from artificial satellites and obtaining a second velocity; a velocity correcting unit for correcting the first velocity by using the second velocity; a running distance calculator for calculating the running distance of the vehicle from the velocity corrected by the velocity correcting unit; and a velocity limiter for setting a velocity limit value range relative to the first velocity if the second velocity cannot be obtained from the GPS receiver, in order to control the first velocity so that it does not exceed the velocity limit value range.

대표청구항 ▼

[ What is claimed is:] [1.] A vehicle navigator for receiving radio waves from artificial satellites and outputting present position information, said vehicle navigator comprising:acceleration detecting means for detecting an acceleration of a vehicle;velocity calculating means for calculating a fir

[ What is claimed is:] [1.] A vehicle navigator for receiving radio waves from artificial satellites and outputting present position information, said vehicle navigator comprising:acceleration detecting means for detecting an acceleration of a vehicle;velocity calculating means for calculating a first velocity of the vehicle on the basis of an acceleration detected by said acceleration detecting means;receiving means for receiving radio waves from artificial satellites and obtaining a second velocity;velocity correcting means for correcting the first velocity by using the second velocity;running distance calculating means for calculating a running distance of the vehicle from the velocity corrected by said velocity correcting means; andvelocity limiting means for setting a velocity limit value range relative to the first velocity if the second velocity is judged to be unobtainable from said receiving means, in order to control the first velocity not to exceed the velocity limit value range, said velocity limiting means using as a reference velocity the first velocity calculated by said velocity calculating means if the second velocity is judged to be unobtainable from said receiving means, obtaining upper and lower velocity limit values through addition and subtraction of a predetermined value to and from the reference velocity, and adopting one of the upper and lower velocity limit values as the velocity limit value.