Patent ID: 7693641

Claim:
A vehicle speed control system for driving a vehicle on a chassis dynamometer, comprising: a controller having: a vehicle speed command anticipating section configured to input a vehicle speed command and to output an anticipated vehicle speed command with a delay factor of a control system of the vehicle taken into account; a driving force calculating section configured to input the anticipated vehicle speed command outputted from the vehicle speed command anticipating section, a vehicle mass, and a running resistance as input data, wherein the driving force calculating section is configured to calculate a driving force from the input data and to output a driving force command; a driving force characterizing section configured to input the driving force command outputted from the driving force calculating section and a vehicle speed, and configured to output an accelerator opening command using a driving force characteristic map where a relationship between the driving force, the vehicle speed and an accelerator opening is previously stored; a proportion calculating section configured to amplify a deviation between the vehicle speed command and the vehicle speed, and to output a vehicle speed deviation correction command; a first adder configured to add the driving force command to the vehicle speed deviation correction command, and to correct the driving force command by the vehicle speed deviation; an acceleration force calculating section configured to input the vehicle speed, and to calculate an actual acceleration force; a second adder configured to add the acceleration force outputted from the acceleration force calculating section and a running resistance of a chassis dynamometer load, and configured to output a detection driving force; a proportional-plus-integral calculator configured to subtract the detection driving force outputted by the second adder from an output of the first adder, to integrate a deviation of the subtraction, and to output a driving-force-correction accelerator opening command; and an accelerator opening control section configured to input a corrected accelerator opening command that is obtained by adding the driving-force-correction accelerator opening command outputted from the proportional-plus-integral calculator to the accelerator opening command outputted from the driving force characterizing section, and configured to output an accelerator opening, and wherein the system is configured such that the vehicle speed is controlled by operating an accelerator of the vehicle using the accelerator opening outputted from the accelerator opening control section.