Patent ID: 7039519

Claim:
A vehicle weight estimating device comprising; an acceleration detecting means for detecting an acceleration of a vehicle; a driving force estimating means for estimating a driving force of the vehicle; a filtered acceleration obtaining means for obtaining a filtered acceleration by eliminating a low frequency component from the detected acceleration; a filtered driving force obtaining means for obtaining a filtered driving force by eliminating a low frequency component from the estimated driving force; an acceleration integrating means for obtaining an acceleration integration by integrating a value corresponding to an absolute value of the filtered acceleration during a predetermined period; a driving force integrating means for obtaining a driving force integration by integrating a value corresponding to an absolute value of the filtered driving force during the predetermined period; a vehicle weight estimating means for estimating the vehicle weight based on the acceleration integration and the driving force integration; a vehicle weight averaging means for inputting the estimated vehicle weight and an estimating number of the vehicle weight and averaging the estimated vehicle weight; a limiter determining means for setting a limiter initial value, providing an upper limiter and a lower limiter passing the limiter initial value, and setting an initial area framed by the limiter initial value, the upper limiter and the lower limiter, and a vehicle weight correcting means for correcting the average vehicle weight based on the initial area during an initial estimation of the vehicle weight.