Patent ID: 8126609

Claim:
A vehicle driving assist system comprising: a traveling situation detecting section configured to output a traveling situation detection result based on at least a following distance between a host vehicle and a preceding obstacle and a host vehicle speed of the host vehicle; a risk potential calculating section configured to calculate a risk potential indicative of a degree of convergence between the host vehicle and the preceding obstacle based on the traveling situation detection result of the traveling situation detecting section; an actuation reaction force calculating section configured to calculate an actuation reaction force to be exerted by an accelerator pedal of the host vehicle based on the risk potential calculated by the risk potential calculating section; an actuation reaction force generating section configured to cause the accelerator pedal to exert the actuation reaction force calculated by the actuation reaction force calculating section; a failure detecting section configured to detect a failure of an operating condition of the actuation reaction force generating section; and an engine torque characteristic correcting section configured to correct an engine torque characteristic, which is a function of an engine torque versus an accelerator pedal actuation amount, based on a detection result of the failure detecting section.