KR960021617A - Apparatus and method for controlling damping force characteristics of vehicle shock absorber - Google Patents

Abstract

In an apparatus and method for controlling the damping force characteristic of a vehicle shock absorber, the vertical spring structure speed signal V _n is determined based on the vertical G sensor output signal as a control signal. When the control unit changes the damping force characteristic of the piston stroke of the shock absorber or contraction stroke side in accordance with the control signal, the control gain increases as the moving average of the highest value of the vertical spring structure speed signal V _n decreases.

Description

Apparatus and method for controlling damping force characteristics of vehicle shock absorber

As this is a public information case, the full text was not included.

1 is an explanatory perspective view of a vehicle equipped with a damping force characteristic control apparatus for a vehicle shock absorber of the first embodiment,

2 is a circuit block diagram of the shock absorber damping force control device of the first embodiment,

3 is a partial cross-sectional view of a representative shock absorber SA used in the first embodiment shown in FIGS.

Claims (14)

A device for controlling damping force characteristics of a suspension system of a vehicle, the apparatus comprising: a damping force characteristic changing member arranged so that the damping force coefficient of the expansion nucleation side of the piston or the piston contraction side of the piston can be changed according to an input drive signal input thereto. At least one buffer manufactured to be positioned between the spring structure and the non-spring structure, detecting means for detecting a vertical acceleration of the spring structure with respect to the direction of gravity, and an acceleration of the vertical spring structure detected by the detecting means. Deriving a speed of the vertical spring structure based on the control unit and deriving the damper force characteristic of the shock absorber through the driving signal inputted to the damping force characteristic changing member of the shock absorber based on the magnitude and direction of the derived speed of the vertical spring structure. Means and the derived vertical spring structure Sampling and maintaining a plurality of peaks in time, calculating a moving average of the plurality of sampled and held peaks, and setting the damping force characteristic when the damping force characteristic changing member changes the damping force characteristic of the shock absorber according to a drive signal input thereto. And computing means for increasing and adjusting the control gain if the calculated moving average for the drive signal for the speed of the derived vertical spring structure decreases. The apparatus of claim 1, wherein a predetermined load is added to the plurality of peaks, and the predetermined load is set according to a derivation order of the plurality of peaks. 2. The apparatus of claim 1, wherein a load is added to a plurality of peaks sampled and maintained according to the frequency of the speed indicating signal of the derived vertical spring structure. 2. A device according to claim 1, wherein the load is added to the plurality of peaks in accordance with the real value of the power ratio between the frequency of the derived vertical spring structure speed of the vehicle and the resonant frequency of the spring structure of the vehicle. In the apparatus for controlling the damping force characteristics of the vehicle shock absorber respectively positioned between the spring structure of the vehicle body and the corresponding non-spring structure of the wheel, the damping force characteristics of the piston expansion stroke side or the piston contraction stroke side of each shock absorber is input thereto. A damping force characteristic change plate to be changed according to the stir signal, an acceleration sensing means of the vertical spring structure which detects the acceleration of the vertical spring structure located adjacent to the buffer and outputs the acceleration signal of the vertical spring structure indicating the same, and the detected vertical spring structure Determine the speed of the vertical spring structure based on the acceleration signal of and determine the change of the damping force characteristics of each shock absorber so as to be able to output a control signal based on the direction mill size of the velocity of each determined vertical sprig structure. Vertical spring structure Sampling means and maintaining a plurality of speed peaks of the determined vertical spring structure, deriving a moving average from said sampled and maintained plurality of peaks for each shock absorber, or extending the stroke of each shock absorber piston, or And derivation means for setting the corresponding control gain for each shock absorber when the moving average derived for the drive signal for the speed of the vertical spring structure becomes small when the damping force characteristic of the contraction stroke is changed according to the stir signal. Device characterized in that. 6. The plurality of low frequencies as claimed in claim 5, wherein the vertical spring structure determining means is adapted to integrate the acceleration signal input of the vertical spring structure with time and to provide the speed signal of the vertical spring structure as a control signal V _n for derivation means. A pass filter (LPF 2) and a plurality of band pass filters (BPF) configured to filter a frequency in a range including a spring structure resonant frequency from a velocity signal input of the vertical spring structure. 7. The apparatus of claim 6, further comprising: comparing means for comparing the direction and magnitude of the velocity signal of each spring structure to be in a rectangular region defined by two values of an upper threshold V _NC-δ and a lower threshold V _NC-C , And the control signal is outputted to the damping force characteristic changing means in accordance with the comparison result by the comparing means. 8. The method according to claim 7, wherein when any one of the speed signals of the vertical spring structure falls within the dead zone range, the corresponding shock absorber is controlled via the control signal such that both the extension stroke and the contraction stroke side are relatively weak. In the damping force characteristic 55, and when any one of the speed signals of the vertical spring structure exceeds the positive threshold V _NC-T , the extension stroke proportional range is determined by η _T extending the extension stroke proportional range adjustment coefficient. , V _n1 , V _n2 ,... The highest value in every half period of the vertical spring structure velocity signal to which V _nn corresponds is the number of subscripts 1, 2,... As n increases in number, K ₁ , K ₂ ... When K _n represents an extension stroke coefficient, V _HT = η _T · (K ₁ · Vn ₂ +… + K _n · V _nn ) / (K ₁ + K ₂ +… K _n ) One of the corresponding buffers is derived so that the position of the damping force coefficient fluctuation means is derived as P _T = (P _{max -TVNC-T} ) / (V _HT -V _NC-T ), and its extension stroke side damping force And the coefficient is controlled to be controlled with a relatively strong damping force coefficient on the extension stroke side and a relatively weak damping force coefficient on the contraction stroke side. 9. The method of claim 8, wherein when any one of the speed signals of the vertical spring structure is equal to or less than the negative threshold V _NC-C , the contraction stroke scaffold range V _{HC is} η _C is the contraction stroke proportional range adjustment coefficient, V _n1 , V _n2 ,... The highest value in every half cycle of the vertical spring structure velocity signal to which V _nn corresponds is the number of subscripts 1, 2,... , n represents the past extrapolated data as its order value increases, K ₁ , K ₂ ,. . When K _n represents the shrinkage stroke side load coefficient, V _HC = η _C · (K ₁ · V _n1 K ₂ +… + K _n · V _nn ) / (K ₁ + K ₂ +… K _n ) Derived from the equation, and the damping force characteristic position is derived from the equation of P _C = P _max-C · (│V _n │-│V _NC-C │) / (│V _HC│ -│V _NC-C│ ), And the corresponding shock absorber is controlled with a relatively strong damping force characteristic on the contraction stroke side and a relatively severe damping force characteristic on the stretch stroke side. 10. The apparatus according to claim 9, wherein the majority _extrapol is the past four values as V _nm = (V _n1 , V _n2 ,..., V _n4 ). 10. The apparatus of claim 9, wherein the peak is set in accordance with the frequency of each of the vertical spring structure velocity signals that occur. 10. The apparatus of claim 9, wherein the highest value is set by multiplying the coefficients f _m (f ₁ , f ₂ ,..., F _n ). 10. An apparatus according to claim 9, wherein the peak is corrected to V _m (V ₁ , V ₂ ,... V _n ) in accordance with the appearing frequency of the corresponding vertical spring structure velocity signal. A method of controlling the damping force characteristic of a vehicle suspension, the method comprising: detecting a vertical acceleration of a spring structure with respect to a direction of gravity; a derivation step of deriving a speed of the vertical spring structure based on the detected acceleration of the vertical spring structure; And controlling the damping force characteristic of the shock absorber based on the magnitude and direction of the velocity of the derived vertical spring structure via the driving signal inputted to the damping force characteristic changing member of the shock absorber. The derivation set when sampling and maintaining a plurality of peaks of velocity over time, calculating a moving average of the sampled and held peaks, and changing the damping force characteristics outside the shock absorber according to a drive signal input thereto. Drive for speed of vertical spring structure Increasing the control gain if the moving average calculated for the call decreases. ※ Note: The disclosure is based on the initial application.