| 摘要 |
PURPOSE: A controlling method of a distance between vehicles is provided to minimize rear-end collisions by controlling the distance between vehicles according to a braking state and a surrounding environment. CONSTITUTION: A controlling method of a distance between vehicles comprises: a step of sensing a front vehicle; a step of calculating rear brake state information to a required brake force; a step of calculating a brake prediction distance according to the rear brake state information and environment information. The controlling method of the distance between vehicles additionally comprises: a step of controlling a distance to a front vehicle according to the brake prediction distance. The second step comprises a step of calculating a wheel speed decrease rate to the required brake power by using a wheel-speed value; and a step of calculating rear brake information by judging a tire air-pressure state and deciding wheel-slip. [Reference numerals] (AA) Start; (BB,DD) No; (CC,EE) Yes; (FF) End; (S101) Sensing a front vehicle by radar; (S102) Calculating the brake state information of an actual vehicle to required brake force by calculating wheel speed reduction rate to the required brake force using a wheel speed sensor value, a G sensor value, and a tire air-pressure sensor value and deciding wheel-slip; (S103) Calculating a predicted braking distance using the brake state information of the calculated vehicle, the vehicle posture information of the G sensor, and the current driving speed information; (S104) Is the predicted braking distance more than a reference braking distance ?; (S105) Keeping a distance between vehicles according to the reference braking distance; (S106) Controlling the increase of the distance between the vehicles according to the predicted braking distance |
