Patent ID: 9561785
Date: 2017-02-07
CPC Classifications: B60T

Claim:
1. A vehicle rear wheel lift tendency judgment device which is installed in a vehicle including a front wheel and a rear wheel, and judges whether or not the rear wheel is likely to be lifted, wherein when in a side view, a first straight line represents a straight line which joins a center of gravity of the vehicle and a ground contact point of the front wheel; a second straight line represents a straight line which passes the center of gravity and is orthogonal to the first straight line; a first direction represents a direction which extends along the first straight line, and which points from the center of gravity to the ground contact point; and a second direction represents a direction which extends along the second straight line, and in which the vehicle turns forward around the ground contact point, the judgment device comprises: the judgment device judges that the rear wheel is likely to be lifted, when the first deceleration is greater in the first direction than a first threshold value, or when the second deceleration is greater in the second direction than a second threshold value, and the judgment device performs at least one of setting for shifting the first threshold value in a direction opposite to the first direction and setting for shifting the second threshold value in a direction opposite to the second direction, when a second-deceleration change rate, which is a change amount in the second deceleration per unit time, becomes greater in the second direction than a change-rate threshold value.