JPH0243672B2 - - Google Patents
Info
- Publication number
- JPH0243672B2 JPH0243672B2 JP58110397A JP11039783A JPH0243672B2 JP H0243672 B2 JPH0243672 B2 JP H0243672B2 JP 58110397 A JP58110397 A JP 58110397A JP 11039783 A JP11039783 A JP 11039783A JP H0243672 B2 JPH0243672 B2 JP H0243672B2
- Authority
- JP
- Japan
- Prior art keywords
- solenoid valve
- power cylinder
- steering
- vehicle speed
- select switch
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000010586 diagram Methods 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D6/00—Arrangements for automatically controlling steering depending on driving conditions sensed and responded to, e.g. control circuits
- B62D6/02—Arrangements for automatically controlling steering depending on driving conditions sensed and responded to, e.g. control circuits responsive only to vehicle speed
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
Description
【発明の詳細な説明】
＜産業上の利用分野＞
本発明は、動力舵取装置における操舵力制御装
置に関するものである。DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a steering force control device in a power steering device.
＜従来技術＞
動力舵取装置のパワーシリンダの両室を車速に
応じて制御されるソレノイドバルブによつて互い
に連通し、操舵力を変化させるいわゆる車速感応
形動力舵取装置は公知である。この種の動力舵取
装置において、パワーシリンダの一方室に通じる
通路中にオリフイスを設け、このオリフイスの開
口面積を小さくすることにより、高速時における
操舵力をより一層重くすることがき、高速安定性
を高めることができる。しかしながら、オリフイ
スの開口面積が小さいと、低速走行時に急ハンド
ルを切つたような場合に、ハンドルのひつかかり
現象を生じ、操舵の追従性が悪くなる。<Prior Art> A so-called vehicle speed sensitive power steering device is known in which both chambers of a power cylinder of the power steering device are communicated with each other by a solenoid valve controlled according to the vehicle speed to change the steering force. In this type of power steering device, an orifice is provided in the passage leading to one chamber of the power cylinder, and by reducing the opening area of this orifice, the steering force at high speeds can be further increased, resulting in improved high-speed stability. can be increased. However, if the opening area of the orifice is small, the steering wheel may become stuck when the vehicle suddenly turns the steering wheel while driving at low speed, resulting in poor steering followability.
従つて前記オリフイスを設ける場合には開口面
積として、低速走行時における操舵の追従性と、
高速走行時における操舵の安定性との双方を満足
する諸元を設定する必要があるが、設計の自由度
が少なく、その両立が難しい問題がある。 Therefore, when providing the above-mentioned orifice, the opening area is determined by the steering followability during low speed driving,
It is necessary to set specifications that satisfy both the stability of steering during high-speed driving, but there is a problem in that there is little freedom in design and it is difficult to achieve both.
＜発明の目的＞
本発明の目的は、低速走行時における操舵の追
従性を損なうことなく、高速走行時における操舵
の安定性をより一層向上できる操舵力制御装置を
提供することである。<Objective of the Invention> An object of the present invention is to provide a steering force control device that can further improve steering stability during high-speed driving without impairing steering followability during low-speed driving.
＜発明の構成＞
かかる目的を達成するために本発明は、パワー
シリンダの両室を車速に応じて連通するソレノイ
ドバルブに加えて、パワーシリンダの一方室に通
ずる通路の面積を制御するソレノイドバルブを設
け、このソレノイドバルブをセレクトスイツチの
切替えに基づいて制御し、前記通路の面積を走行
条件に応じ可変制御するようにしたものである。<Structure of the Invention> In order to achieve the above object, the present invention includes a solenoid valve that communicates between both chambers of the power cylinder depending on the vehicle speed, as well as a solenoid valve that controls the area of a passage leading to one chamber of the power cylinder. The solenoid valve is controlled based on the switching of a select switch, and the area of the passage is variably controlled depending on the driving conditions.
＜実施例＞
以下本発明の実施例を図面に基づいて説明す
る。第１図において、１０は動力舵取装置を示
し、この動力舵取装置１０はサーボバルブ１７
（第２図）を収納したバルブハウジング１１と、
ピストン１８（第２図）を嵌装したパワーシリン
ダ１２とを一体的に固着してなり、ハンドル操作
によりサーボバルブ１７が作動されると、操舵用
ポンプ１３より供給口１４を介して供給された圧
油がパワーシリンダ１２の一方室に分配され、パ
ワーシリンダ１２の他方室の油は排出口１５より
タンク１６に排出される。前記パワーシリンダ１
２には車速に応じてパワーシリンダ１２の両室を
連通する第１のソレノイドバルブ２１と、前記パ
ワーシリンダ１２の一方室に通ずる通路面積を走
行条件に応じて制御する第２のソレノイドバルブ
２２が取付けられている。<Examples> Examples of the present invention will be described below based on the drawings. In FIG. 1, 10 indicates a power steering device, and this power steering device 10 includes a servo valve 17.
(Fig. 2);
It is integrally fixed with a power cylinder 12 in which a piston 18 (Fig. 2) is fitted, and when the servo valve 17 is actuated by operating the handle, water is supplied from the steering pump 13 through the supply port 14. Pressure oil is distributed to one chamber of the power cylinder 12, and oil in the other chamber of the power cylinder 12 is discharged from the discharge port 15 to the tank 16. The power cylinder 1
2 includes a first solenoid valve 21 that communicates between both chambers of the power cylinder 12 according to the vehicle speed, and a second solenoid valve 22 that controls the passage area leading to one chamber of the power cylinder 12 according to the driving conditions. installed.
第２図は、前記動力舵取装置１０の流体回路を
等価的に示したもので、２５は前記第１のソレノ
イドバルブ２１によつて制御される第１の絞り
部、２６は前記第２のソレノイドバルブ２２によ
つて制御される第２の絞り部である。第１の絞り
部２５は通常は閉止されてパワーシリンダ１２の
両室の連通を遮断しており、第１のソレノイドバ
ルブ２１に電流が印加されるとその印加電流に応
じた吸引力が作用する図略の可動スプールの変位
により開口され、パワーシリンダ１２の両室を互
いに連通させるようになつている。また第２の絞
り部２６は通常はパワーシリンダ１２の一方室に
通ずる通路の面積が大きい状態に保持されている
が、第２のソレノイドバルブ２２に電流が印加さ
れるとその印加電流に応じた吸引力が作用する図
略の可動スプールの変位により、通路面積を減少
させるようになつている。 FIG. 2 equivalently shows the fluid circuit of the power steering device 10, where 25 is a first throttle section controlled by the first solenoid valve 21, and 26 is a first throttle section controlled by the first solenoid valve 21. This is the second constriction controlled by the solenoid valve 22. The first throttle section 25 is normally closed to cut off communication between the two chambers of the power cylinder 12, and when a current is applied to the first solenoid valve 21, an attractive force is applied according to the applied current. It is opened by displacement of a movable spool (not shown), and allows both chambers of the power cylinder 12 to communicate with each other. Further, the second constriction part 26 is normally maintained in a state where the area of the passage leading to one chamber of the power cylinder 12 is large, but when a current is applied to the second solenoid valve 22, the area of the passage leading to one chamber of the power cylinder 12 is kept large. The passage area is reduced by displacement of a movable spool (not shown) to which suction force is applied.
２７は車速センサで、この車速センサ２７は車
速に比例した信号を発生する。２８は車室内のパ
ネル上に設置されたセレクトスイツチで、このセ
レクトスイツチ２８は運転者により低速あるいは
高速等の走行条件に応じて切替えられ、走行条件
に応じた信号を発生する。２９は例えばマイクロ
コンピユータからなる制御回路で、この制御回路
２９は前記車速センサ２７の信号をそれに比例し
た制御電流に演算し、この制御電流を前記第２の
ソレノイドバルブ２１に供給するとともに、前記
セレクトスイツチ２８からの信号をそれに応じた
制御電流に演算し、この制御電流を前記第２のソ
レノイドバルブ２２に供給する。 27 is a vehicle speed sensor, and this vehicle speed sensor 27 generates a signal proportional to the vehicle speed. Reference numeral 28 denotes a select switch installed on a panel inside the vehicle, and this select switch 28 is switched by the driver according to the driving conditions such as low speed or high speed, and generates a signal according to the driving conditions. Reference numeral 29 denotes a control circuit composed of, for example, a microcomputer, and this control circuit 29 calculates the signal from the vehicle speed sensor 27 into a control current proportional to the signal, supplies this control current to the second solenoid valve 21, and also supplies the control current to the second solenoid valve 21. The signal from the switch 28 is calculated into a corresponding control current, and this control current is supplied to the second solenoid valve 22.
上記した構成において、市街地を走行する低速
走行時においては、セレクトスイツチ２８が側
（操舵力「軽」）に切替えられており、これによつ
て制御回路２９より第２のソレノイドバルブ２２
に供給される制御電流は０となり、パワーシリン
ダ１２の一方に通ずる通路中の第２の絞り部２６
を最大限に開口させている。従つて低速走行時に
急ハンドルを切つたような場合でも、ハンドルの
ひつかかりが生ずることがなく、操舵の追従性を
良好に保持できるようになる。この際の操舵特性
を第３図の実線で示す。 In the above configuration, when driving at low speeds in the city, the select switch 28 is switched to the side (steering force "light"), and the control circuit 29 then controls the second solenoid valve 22.
The control current supplied to the second constriction section 26 in the passage leading to one side of the power cylinder 12 becomes zero.
is opened to the maximum extent. Therefore, even if the steering wheel is suddenly turned while driving at low speed, the steering wheel will not become stuck, and the steering followability can be maintained well. The steering characteristics at this time are shown by the solid line in FIG.
しかる状態で高速走行に移行し、車速が所定速
度以上となると、第１のソレノイドバルブ２１に
供給される制御電流による吸引力によつて図略の
可動スプールが変位され始め、第１の紋り部２５
が開口し始める。これによつてパワーシリンダ１
２の両室は第１の絞り部２５を介して互いに連通
され、しかしてかかる第１の絞り部２５の開口面
積は第１のソレノイドバルブ２１に供給される制
御電流に比例して増大するので、パワーシリンダ
１２の両室の間でバイパスされるバイパス流量が
車速の増大に応じて増加され、操舵特性は第３図
の破線Ａに示すように変化する。従つて車速の上
昇に応じて操舵力が重くなる高速安定性がもたら
される。 In this state, when the vehicle shifts to high-speed running and the vehicle speed exceeds a predetermined speed, the movable spool (not shown) begins to be displaced by the attraction force generated by the control current supplied to the first solenoid valve 21, and the first spool starts to move. Part 25
begins to open. By this, power cylinder 1
The two chambers are communicated with each other via the first constriction section 25, and the opening area of the first constriction section 25 increases in proportion to the control current supplied to the first solenoid valve 21. , the bypass flow rate bypassed between both chambers of the power cylinder 12 increases as the vehicle speed increases, and the steering characteristics change as shown by the broken line A in FIG. 3. Therefore, high-speed stability is achieved in which the steering force increases as the vehicle speed increases.
このような高速走行時にセレクトスイツチ２８
を側（操舵力「重」）に切替えると、この切替
信号に基づいて制御回路２９は第２のソレノイド
バルブ２２に予め定められた制御電流を供給し、
この制御電流による吸引力によつて図略の可動ス
プールが所定量変位され、第２の絞り部２６の開
口面積が縮小される。これによつて操舵力はさら
に重くなり、操舵特性は第３図の破線ＡからＢの
ように変化し、高速安定性がより一層高められ
る。 When driving at such high speeds, the select switch 28
When the steering force is switched to the side (steering force "heavy"), the control circuit 29 supplies a predetermined control current to the second solenoid valve 22 based on this switching signal,
The movable spool (not shown) is displaced by a predetermined amount by the attraction force generated by this control current, and the opening area of the second constriction portion 26 is reduced. As a result, the steering force becomes heavier, the steering characteristics change as shown by the broken line A to B in FIG. 3, and high-speed stability is further improved.
すなわち、第２図の方向に圧力流体が流れる
場合には、第２の絞り部２６による圧力降下
（ΔP）分だけパワーシリンダ１２の右室の圧力が
減じられ、逆に方向に圧力流体が流れる場合に
は、第２の絞り部２６による紋り降下によつてパ
ワーシリンダ１２の右室に背圧（ΔP′）が発生さ
れ、この結果パワーシリンダ１２の両室の圧力差
がΔPあるいはΔP′（≒ΔP）だけ減じられ、操舵
力が重くなる。 That is, when the pressure fluid flows in the direction shown in FIG. 2, the pressure in the right chamber of the power cylinder 12 is reduced by the pressure drop (ΔP) due to the second restrictor 26, and the pressure fluid flows in the opposite direction. In this case, a back pressure (ΔP') is generated in the right chamber of the power cylinder 12 due to the drop caused by the second throttle part 26, and as a result, the pressure difference between the two chambers of the power cylinder 12 becomes ΔP or ΔP'. (≒ΔP), and the steering force becomes heavier.
上記実施例においては、セレクトスイツチ２８
を走行条件に応じて２位置に切替え、通路面積を
２段階に制御する例について説明したが、その他
山路走行等の各種条件に応じて通路面積を多段に
制御することもできるものである。 In the above embodiment, the select switch 28
Although an example has been described in which the passage area is controlled in two stages by switching between two positions depending on the driving conditions, the passage area can also be controlled in multiple stages according to various other conditions such as driving on a mountain road.
＜発明の効果＞
以上述べたように本発明においては、パワーシ
リンダの両室を車速に応じて連通するソレノイド
バルブに加えて、パワーシリンダの一方室に通ず
る通路の面積を制御するソレノイドバルブを設
け、このソレノイドにより高速時にセレクトスイ
ツチが切替えられた場合には前記通路面積を縮小
するようにしたので、低速走行時における操舵の
追従性を損なうことなく、高速走行時における操
舵のより一層の安定性を容易に達成できる効果が
ある。<Effects of the Invention> As described above, in the present invention, in addition to the solenoid valve that communicates between both chambers of the power cylinder depending on the vehicle speed, a solenoid valve that controls the area of the passage leading to one chamber of the power cylinder is provided. Since this solenoid reduces the passage area when the select switch is switched at high speeds, the steering stability at high speeds is improved without compromising steering followability at low speeds. There are effects that can be easily achieved.
図面は本発明の実施例を示すもので、第１図は
動力舵取装置を示す図、第２図は操舵力制御装置
を系統的に示す図、第３図は操舵特性を示す図で
ある。
１０……動力舵取装置、１２……パワーシリン
ダ、２１，２２……ソレノイドバルブ、２５……
第１の絞り部、２６……第２の絞り部、２７……
車速センサ、２８……セレクトスイツチ、２９…
…制御回路。
The drawings show an embodiment of the present invention; FIG. 1 is a diagram showing a power steering device, FIG. 2 is a diagram systematically showing a steering force control device, and FIG. 3 is a diagram showing steering characteristics. . 10... Power steering device, 12... Power cylinder, 21, 22... Solenoid valve, 25...
First aperture section, 26... Second aperture section, 27...
Vehicle speed sensor, 28...Select switch, 29...
...control circuit.
Claims (1)
通、遮断する第１のソレノイドバルブと、前記パ
ワーシリンダの一方室に通ずる通路の面積を制御
する第２のソレノイドバルブと、車速を検出する
車速センサと、低速あるいは高速等の走行条件に
応じて切替えられるセレクトスイツチと、前記車
速センサの信号に応答し前記パワーシリンダの両
室を車速に応じて連通させるべく前記第１のソレ
ノイドバルブを制御し、かつ前記セレクトスイツ
チの切替え信号に応答し前記通路の面積を縮小さ
せるべく前記第２のソレノイドバルブを制御する
制御回路とを備えてなる動力舵取装置における操
舵力制御装置。1. A first solenoid valve that communicates with and blocks both chambers of the power cylinder of the power steering device, a second solenoid valve that controls the area of a passage leading to one chamber of the power cylinder, and a vehicle speed sensor that detects vehicle speed. a select switch that is switched depending on driving conditions such as low speed or high speed; and a select switch that controls the first solenoid valve in response to a signal from the vehicle speed sensor to communicate the two chambers of the power cylinder in accordance with the vehicle speed; and a control circuit for controlling the second solenoid valve to reduce the area of the passage in response to a switching signal from the select switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11039783A JPS601073A (en) | 1983-06-20 | 1983-06-20 | Steering force controlling device for power steering device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11039783A JPS601073A (en) | 1983-06-20 | 1983-06-20 | Steering force controlling device for power steering device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS601073A JPS601073A (en) | 1985-01-07 |
| JPH0243672B2 true JPH0243672B2 (en) | 1990-10-01 |
Family
ID=14534768
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11039783A Granted JPS601073A (en) | 1983-06-20 | 1983-06-20 | Steering force controlling device for power steering device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS601073A (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0659836B2 (en) * | 1986-09-29 | 1994-08-10 | 日産自動車株式会社 | Control valve for power steering device |
| JPH0657533B2 (en) * | 1986-09-30 | 1994-08-03 | 日産自動車株式会社 | Power steering hydraulic control device |
| JP2543511B2 (en) * | 1986-12-27 | 1996-10-16 | 日産自動車株式会社 | Power steering hydraulic control device |
| JPS63166657A (en) * | 1986-12-27 | 1988-07-09 | Nissan Motor Co Ltd | Hydraulic controller for power steering |
| JPH0815866B2 (en) * | 1986-12-27 | 1996-02-21 | 日産自動車株式会社 | Power steering hydraulic control device |
| JPS63166658A (en) * | 1986-12-27 | 1988-07-09 | Nissan Motor Co Ltd | Hydraulic controller for power steering |
| JP2503218B2 (en) * | 1986-12-27 | 1996-06-05 | 日産自動車株式会社 | Power steering hydraulic control device |
| JP2532081B2 (en) * | 1987-01-30 | 1996-09-11 | 日産自動車株式会社 | Power steering hydraulic control device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5295424A (en) * | 1976-02-05 | 1977-08-11 | Toyota Motor Corp | Speed sensitive type power steering |
| JPS5579754A (en) * | 1978-12-08 | 1980-06-16 | Kayaba Ind Co Ltd | Power steering system |
-
1983
- 1983-06-20 JP JP11039783A patent/JPS601073A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5295424A (en) * | 1976-02-05 | 1977-08-11 | Toyota Motor Corp | Speed sensitive type power steering |
| JPS5579754A (en) * | 1978-12-08 | 1980-06-16 | Kayaba Ind Co Ltd | Power steering system |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS601073A (en) | 1985-01-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPH0316305B2 (en) | ||
| KR940008993A (en) | Power steering | |
| JPH0256274B2 (en) | ||
| JPH0243672B2 (en) | ||
| JPS63188574A (en) | Hydraulic control device for power steering | |
| JPH0653497B2 (en) | Power steering for a motor vehicle with a control valve for generating a reaction pressure | |
| JP2503574B2 (en) | Vehicle power steering device | |
| JPS63166657A (en) | Hydraulic controller for power steering | |
| JP3188067B2 (en) | Power steering device | |
| JP3006777B2 (en) | Load sensing hydraulic circuit | |
| JPS5929569A (en) | Power steeering gear | |
| US5090726A (en) | Suspension control system | |
| JPH0124664B2 (en) | ||
| JPS6042158A (en) | Automatic variable controller for reaction force in power steering | |
| KR970062217A (en) | Speed regulator of crawler excavator driving motor | |
| JP2617750B2 (en) | 4-wheel steering system | |
| JPS609098Y2 (en) | Steering force control device in power steering device | |
| JPS6378930A (en) | Oil-pressure traveling circuit for oil-pressure shovel | |
| JP2520540Y2 (en) | Flow control device for power steering | |
| JP3188043B2 (en) | Hydraulic power steering | |
| KR100280307B1 (en) | Vehicle speed sensitive steering gear | |
| JP2608423B2 (en) | Speed-sensitive power steering device | |
| JPH0152229B2 (en) | ||
| JP3737715B2 (en) | Power steering device | |
| JPH0147346B2 (en) |