JPH0281278U

JPH0281278U -

Info

Publication number: JPH0281278U
Application number: JP16157488U
Authority: JP
Priority date: 1988-12-13
Filing date: 1988-12-13
Publication date: 1990-06-22
Anticipated expiration: 2003-12-13
Also published as: JPH0740461Y2

Description

[Brief explanation of drawings]

第１図ないし第１３図は本考案の実施例を示し
、第１図はこの発明の後輪操舵装置を適用した四
輪操舵装置を示す構成図、第２図は進相機構を示
す一部切欠した斜視図、第３図はその二組の遊星
歯車機構廻りを示す断面図、第４図は進相機構の
コントロールバルブの構造を示す断面図、第５図
は同相用のコントロールバルブを示す断面図、第
６図は逆相及び進相用コントロールバルブを示す
断面図、第７図はその制御の電流値と差圧の関係
を示す線図、第８図はエンジン駆動の定流量のオ
イルポンプの特性を示す線図、第９図はＣＰＵ内
の制御動作を表わしたフローチヤート図、第１０
図は車速Ｖと係数Ｋの関係を示すマツプ図、第１
１図は進相制御を示す線図、第１２図は位相制御
を示す線図、第１３図はその合成力を示す線図、
第１４〜１６図はその他の実施例を示す第１０図
対応図、第１７図は従来例を示すシステム図であ
る。１ａ，１ｂ……前輪、６……パワーステアリン
グ、１４……進相機構、８２ａ，８２ｂ……後輪
、９８……同相用のコントロールバルブ、９７ａ
，９７ｂ……リヤパワーシリンダの同相用左右室
、１００……逆相及び進相用のコントロールバル
ブ、９２ａ，９２ｂ……リアパワーシリンダの逆
相用シリンダ室、１２６……ＣＰＵ、１２７……
ハンドル角速度センサ、１２８……車速センサー
。 1 to 13 show an embodiment of the present invention, FIG. 1 is a configuration diagram showing a four-wheel steering device to which the rear wheel steering device of the invention is applied, and FIG. 2 is a part showing a phase advance mechanism. A cutaway perspective view, Fig. 3 is a sectional view showing the two sets of planetary gear mechanisms, Fig. 4 is a sectional view showing the structure of the control valve of the phase advancement mechanism, and Fig. 5 shows the control valve for the same phase. 6 is a sectional view showing the reverse phase and phase advancing control valves, FIG. 7 is a diagram showing the relationship between the control current value and differential pressure, and FIG. 8 is a constant flow oil flow diagram for engine drive. Figure 9 is a diagram showing the characteristics of the pump, and Figure 9 is a flowchart showing the control operation within the CPU.
The figure is a map showing the relationship between vehicle speed V and coefficient K.
Figure 1 is a diagram showing phase advance control, Figure 12 is a diagram showing phase control, Figure 13 is a diagram showing the resultant force,
14 to 16 are diagrams corresponding to FIG. 10 showing other embodiments, and FIG. 17 is a system diagram showing a conventional example. 1a, 1b...front wheel, 6...power steering, 14...phase advance mechanism, 82a, 82b...rear wheel, 98...control valve for same phase, 97a
, 97b...Rear power cylinder left and right chambers for in-phase, 100...Control valve for reverse phase and phase advance, 92a, 92b...Cylinder chamber for reverse phase of rear power cylinder, 126...CPU, 127...
Handle angular velocity sensor, 128...Vehicle speed sensor.

Claims

[Scope of utility model registration request]

An in-phase steering mechanism is provided to steer the rear wheels in the same phase direction as the front wheels in response to the hydraulic pressure generated by the front wheel power steering device, and an anti-phase steering mechanism is provided to steer the rear wheels in the opposite phase direction from the front wheels. an actuator, a phase advance steering actuator provided to increase the steering angle of the front wheels independently of the operation of the steering wheel, a vehicle speed sensor that detects vehicle speed, a steering sensor that detects the steering state of the steering wheel; A four-wheel steering system comprising: a controller that integrally controls the operation of the reverse phase steering actuator and the phase advance steering actuator based on a vehicle speed detected by a vehicle speed sensor and a steering speed detected by a steering sensor, A four-wheel steering system characterized in that the controller is configured to change the sensitivity characteristic of the command value for controlling the operation of each actuator to the steering angular velocity stepwise according to the vehicle speed range.