Patent ID: 8078380

Claim:
A control device for a vehicle automatic running control comprising: an electronic throttle control system for a vehicle having, a vehicle speed sensor for detecting an actual running speed of the vehicle, a vehicle speed setting switch for setting a first preset vehicle speed, an electrical driving device for operating a throttle valve, and an electronic control unit for controlling an opening degree of the throttle valve by operating the electrical driving device in accordance with a signal from the vehicle speed setting switch, so that the vehicle runs at the first preset vehicle speed set by a vehicle driver; and an external module for outputting a signal for a second preset vehicle speed depending on a vehicle running condition; wherein the electronic control unit comprises: a speed selecting portion for selecting one of the first and second preset vehicle speeds, which is smaller than the other; a calculating portion for calculating a feed-back amount of a vehicle acceleration based on the preset vehicle speed selected at the speed selecting portion as well as the actual running speed of the vehicle; a calculating portion for calculating a demand vehicle acceleration based on the feed-back amount of the vehicle acceleration; a calculating portion for calculating a demand vehicle driving power based on the demand vehicle acceleration; a calculating portion for calculating a demand engine torque based on the demand vehicle driving power; and a calculating portion for calculating a target opening degree of the throttle valve based on the demand engine torque, so that the throttle valve is actuated to move to a position corresponding to the target opening degree.