Patent ID: 8406947
Filing Date: 2013-03-26
Classification: B60L,B60T,G01P,Y02T

Abstract:
1. A vehicle body speed calculation device comprising: a wheel speed derivator to derive wheel speeds based on detection signals from wheel speed sensors which detect the speeds of wheels of a vehicle; a rotational speed derivator to derive a rotational speed based on a detection signal from a rotational speed detection sensor which detects the rotational speed of an energy conversion device, the energy conversion device being connected to the wheels and being capable of mutual conversion between electric energy and rotational energy; and a body speed calculator to calculate a body speed by using the rotational speed of the energy conversion device derived by the rotational speed derivator when the vehicle is travelling in a predetermined low speed range and for calculating the body speed by using the wheel speeds derived by the wheel speed derivator when the vehicle is travelling in a predetermined high speed range which is higher in speed than the predetermined low speed range, wherein, when the vehicle is travelling in a switching range between the predetermined low speed range and the predetermined high speed range, the body speed calculator calculates the body speed after weighting a first body speed calculated by using the wheel speeds derived by the wheel speed derivator and weighting a second body speed calculated by using the rotational speed derived by the rotational speed derivator, wherein, in the switching range, the body speed calculator performs the switching between the first body speed and the second body speed while changing weightings on the first and second body speeds, wherein the body speed calculator provides an up/down limiting guard against changing the weightings, and wherein the up/down limiting guard is varied in dependence on a speed difference between the first body speed and the second body speed.