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2. 发明专利

DE102009021950A1 未知
公开(公告)号：DE102009021950A1
公开(公告)日：2009-12-03
申请号：DE102009021950
申请日：2009-05-19
申请人： HITACHI LTD , KOBE UNIVERSITY KOBE
发明人： ITAGAKI NORIAKI , ICHIMARU NOBUYUKI , KOBAYASHI TAKAHIDE , GANKAI TATSUYA , FUKAO TAKANORI
IPC分类号： B60G17/00
摘要： The present invention provides a suspension control apparatus capable of an excellent vibration control by a model thereof designed to incorporate nonlinearity and a time-lag element of a control damper. The present invention employs the backstepping method which is one of nonlinear control methods, and is designed so as to incorporate the nonlinearity of a damper 4. In addition, a nonlinear controller 5 uses a damping force Fu obtained by expressing the dynamics of a damping force characteristic variable portion [damping force Fu(v, i)] by a first-order lag system, so as to compensate the dynamics of the damper 4, whereby a control system is formed so as to incorporate the time-lag element of the control damper. As a result, it is possible to reduce time lag, and to practically adjust a control force according to the characteristics of the control damper.

3. 发明专利

DE19736426B4 未知
公开(公告)号：DE19736426B4
公开(公告)日：2006-01-12
申请号：DE19736426
申请日：1997-08-21
申请人： HITACHI LTD
发明人： ICHIMARU NOBUYUKI
IPC分类号： B60G17/015 , B60G17/06 , B60G23/00 , H01F7/18
摘要： In the suspension control apparatus of the present invention, a CPU determines a desired damping force, based on an acceleration of a car body in a vertical direction, which is detected by an acceleration sensor, and also determines a PWM duty ratio corresponding to an intensity of a target current (an average intensity of the applied current) required for generating the desired damping force. Further, the CPU detects a voltage provided by a battery and adjusts the PWM duty ratio, based on the detected voltage value, so as to maintain a dither amplitude at a predetermined level. A PWM signal having the adjusted duty ratio is outputted to a transistor, to thereby apply a current which is obtained by superimposing a dither on the target current. By this arrangement, the dither amplitude can be maintained at a predetermined level, even when the voltage value changes, so that an undesirable increase in hysteresis with respect to a damping force can be avoided and pronounced noise and vibration of a proportional solenoid valve can be suppressed.

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