Patent ID: 7227332
Filing Date: 2007-06-05
Classification: B60L,Y02T

Abstract:
1. A driving control device for an electric vehicle, comprising: an electric machine which is driven by a current supplied from a battery; a transmission which is drivingly coupled with the electric machine and performs shifting at a predetermined gear ratio; a charging state detecting portion which detects an electric variable that shows a charging state of the battery; a fail determination processing device that determines whether the electric variable exceeds a first threshold value and makes a fail determination when the electric variable exceeds the first threshold value; a charging control processing device that decreases a rotational speed of the electric machine when the fail determination is made; an electric machine rotational speed calculation processing device which calculates a rotational speed of the electric machine; and an overspeed determination processing device which determines whether the rotational speed of the electric machine exceeds a second threshold value and makes an overspeed determination when the rotational speed of the electric machine exceeds the second threshold value, wherein the charging control processing device decreases the rotational speed of the electric machine when the fail determination and the overspeed determination are made, and the charging control processing device decreases the rotational speed of the electric machine by decreasing the gear ratio.