초록 ▼

A suspension control system for an automotive vehicle is provided in which a movement of a sprung mass velocity is monitored, when the magnitude of the sprung mass velocity is below a predetermined threshold value, a control unit outputs a control signal to a pulse motor to vary the position of an a

A suspension control system for an automotive vehicle is provided in which a movement of a sprung mass velocity is monitored, when the magnitude of the sprung mass velocity is below a predetermined threshold value, a control unit outputs a control signal to a pulse motor to vary the position of an adjuster so that one of extension and compression stroke sides of a position member of a shock absorber, whose direction is the same as that of the sprung mass velocity provides a high damping coefficient, and when the magnitude of the sprung mass velocity is above the predetermined threshold value, a control constant for the damping coefficient is changed toward a high damping sensitivity range until the sprung mass velocity exceeding the predetermined threshold value is reduced below another predetermined threshold value, a magnitude of the other predetermined threshold value being lower than that of the predetermined threshold value.

대표청구항 ▼

A suspension control system for an automotive vehicle, comprising: a) at least one shock absorber, interposed between a sprung mass and an unsprung mass of the vehicle, having a piston member and a damping coefficient varying device disposed in the shock absorber, said damping coefficient varying de

A suspension control system for an automotive vehicle, comprising: a) at least one shock absorber, interposed between a sprung mass and an unsprung mass of the vehicle, having a piston member and a damping coefficient varying device disposed in the shock absorber, said damping coefficient varying device operatively changing positions in response to a control signal so that a damping coefficient of control signal so that a damping coefficient of either of an extension stroke side or a compression stroke side with respect to the piston member which is the same direction of the sprung mass movement is set to a target damping coefficient; b) determining means, having at least one acceleration sensor disposed on a part of the sprung mass adjacent to said shock absorber, for detecting a vertical acceleration of the sprung mass and for determining a vertical velocity of the sprung mass on the basis of a signal indicative of the vertical acceleration derived from said acceleration sensor; c) setting means for previously setting a first threshold value for the determined sprung mass velocity and a second threshold value therefor, said second threshold value having an absolute value which is lower than an absolute value of the first threshold value; d) monitoring means for monitoring a change with respect to time of the determined sprung mass velocity indicative signal derived from said determining means with respect to the first and second threshold values; and e) controlling means for generating and outputting said control signal to said damping coefficient varying device based upon inputs received from said determining means, said setting means, and said monitoring means so that the damping coefficient at either one of the extension and compression stroke sides, wherein the direction of the piston member is the same as that of the determined sprung mass velocity, is set to a predetermined high damping coefficient as the target damping coefficient when an absolute value of the determined sprung mass velocity is below the absolute value of the first threshold value, said controlling means having a control constant changing block that changes said control signal for changing a control constant for the damping coefficient of the shock absorber toward a higher damping sensitivity range so as to prevent the piston member from reaching a maximum stroke limit until the absolute value of the sprung mass velocity is reduced below that of the second threshold value, when the absolute value of the sprung mass velocity is above the absolute value of the first threshold value.