Vehicle rear wheel lift tendency judgment device

摘要

A vehicle rear wheel lift tendency judgment device: includes a first deceleration obtaining device for obtaining a first deceleration along a first straight line, being a component in a first direction of an acceleration on a center of gravity, and a second deceleration obtaining device for obtaining a second deceleration along a second straight line, being a component in a second direction of the acceleration; judges that a rear wheel tends to be lifted, when the first deceleration is greater in the first direction than a first threshold, or when the second deceleration is greater in the second direction than a second threshold; and performs at least one of setting for shifting the first threshold in a direction opposite to the first direction and setting for shifting the second threshold in a direction opposite to the second direction, when a second-deceleration change rate being a change amount in the second deceleration per unit time becomes greater in the second direction than a change-rate threshold, enabling a quick judgment of a rear wheel lift tendency.

主权项

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:
a first deceleration obtaining device for obtaining a first deceleration which is a component in the first direction of an acceleration on the center of gravity; anda second deceleration obtaining device for obtaining a second deceleration which is a component in the second direction of the acceleration on the center of gravity, wherein 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.