JPH05170000A - Control device for differential motion limiting device - Google Patents

Control device for differential motion limiting device

Info

Publication number
JPH05170000A
JPH05170000A JP35647691A JP35647691A JPH05170000A JP H05170000 A JPH05170000 A JP H05170000A JP 35647691 A JP35647691 A JP 35647691A JP 35647691 A JP35647691 A JP 35647691A JP H05170000 A JPH05170000 A JP H05170000A
Authority
JP
Japan
Prior art keywords
differential limiting
road map
limiting device
differential
force
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.)
Granted
Application number
JP35647691A
Other languages
Japanese (ja)
Other versions
JP2722150B2 (en
Inventor
Junichi Kato
順一 加藤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hino Motors Ltd
Original Assignee
Hino Motors Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hino Motors Ltd filed Critical Hino Motors Ltd
Priority to JP3356476A priority Critical patent/JP2722150B2/en
Publication of JPH05170000A publication Critical patent/JPH05170000A/en
Application granted granted Critical
Publication of JP2722150B2 publication Critical patent/JP2722150B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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  • Arrangement And Mounting Of Devices That Control Transmission Of Motive Force (AREA)
  • Arrangement And Driving Of Transmission Devices (AREA)

Abstract

PURPOSE:To avoid frequent variation in differential motion limiting force in a low vehicle speed range during running on a public road so as to stabilize the control of a differential motion limiting device the differential motion limiting force of which is controlled, and which is released from the limitation of the differential motion when a foot brake is worked. CONSTITUTION:On a public road map 76 for designating a differential motion limiting force for a differential motion limiting device 10 during running on a public road, the differential motion limiting force is designated to zero in a low vehicle speed range. The differential motion limiting device 10 changes the differential motion limiting force in accordance with an internal pressure of a cylinder therefor. A CPU 50 controls a first solenoid selector valve 44 and a second solenoid selector valve 48 so as to change the internal pressure of the cylinder.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】この発明は、車両に搭載される差
動制限装置の制御装置に係り、詳しくは中高車速域にも
適当に差動制限を行って操向安定性(直進安定性)を得
る差動制限装置の制御装置に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for a differential limiting device mounted on a vehicle, and more particularly, to a steering stability (straight running stability) by appropriately limiting the differential in the middle and high vehicle speed ranges. The present invention relates to a control device for a limited slip differential device.

【0002】[0002]

【従来の技術】悪路脱出の改善等のために使用されてい
る差動制限装置は一般道の高速走行時の操向安定性の改
善にも利用可能である。そこで、特開平61−6762
9号公報では、差動制限装置の差動制限力を車速に応じ
て制御しているが、差動制限装置の差動制限力と走行路
面の摩擦係数とは無関係となっている。
2. Description of the Related Art A differential limiting device used for improving escape from a rough road can also be used for improving steering stability during high speed running on a general road. Therefore, Japanese Patent Laid-Open No. 61-6762
In JP-A-9, the differential limiting force of the differential limiting device is controlled according to the vehicle speed, but the differential limiting force of the differential limiting device and the friction coefficient of the road surface are irrelevant.

【0003】[0003]

【発明が解決しようとする課題】雪道の走行でも、高車
速域において差動制限装置の差動制限力を増大させて、
操向安定性を得ることが可能であるが、低摩擦路として
の雪道では、操向安定性より悪路からの脱出を重視する
必要があるため、差動制限装置の差動制限力を増大開始
する車速は、一般道の走行時よりも高くする必要があ
る。特開平61−67629号公報では一般道走行及び
雪道走行に関係なく差動制限装置の差動制限力が決めら
れるので、一般道及び雪道走行の一方に適切となるよう
に、差動制限装置の差動制限力を合わせると、他方が不
適切となる問題点がある。
Even when traveling on a snowy road, the differential limiting force of the differential limiting device is increased in the high vehicle speed range,
It is possible to obtain steering stability, but on snowy roads with low friction, it is necessary to prioritize escape from bad roads rather than steering stability. The vehicle speed at which the increase starts needs to be higher than that when traveling on a general road. In Japanese Patent Laid-Open No. 61-67629, the differential limiting force of the differential limiting device is determined irrespective of whether the vehicle is traveling on a general road or traveling on a snowy road. When the differential limiting forces of the devices are combined, there is a problem that the other becomes inadequate.

【0004】そこで、本出願人は、平成3年6月12日
付け特許出願において、一般道の走行に適した差動制限
力を指定している一般道マップと、雪道の走行に適した
差動制限力を指定している雪道マップとの2種のマップ
を用意し、スリップ率等から一般道走行か雪道モード走
行かを検出して、一般道マップ及び雪道マップの一方を
自動的に選択する差動制限装置の制御装置を提案した。
Therefore, in the patent application dated June 12, 1991, the applicant of the present invention applied a general road map that specifies a differential limiting force suitable for traveling on a general road and a general road map suitable for traveling on a snowy road. Two types of maps, a snow road map that specifies the differential limiting force, are prepared, and one of the general road map and the snow road map is detected by detecting whether the road is running on the normal road or the snow road mode from the slip ratio. We proposed a control device for a limited slip differential that automatically selects.

【0005】一方、フートブレーキが踏み込まれたとき
は、差動制限装置の差動制限を解除する必要があり、一
般道走行時の差動制限装置の差動制限力を指定した一般
道マップにおいて、低車速域も差動制限装置による差動
制限が生じるように、差動制限力が設定されていると、
一般道走行時の低車速域における頻繁なフートブレーキ
の作動、非作動に対して差動制限装置の差動制限力が零
と一般道マップの設定値との間において頻繁に変動す
る。一般的な差動制限装置の制御装置では、差動制限力
は電磁切替弁による差動制限装置の空気圧の制御を介し
て制御されるようになっているので、作動制限力の頻繁
な変動は電磁切替弁の切替頻度を増大させて、制御を不
安定にさせることになる。
On the other hand, when the foot brake is depressed, it is necessary to cancel the differential limiting of the differential limiting device, and in the general road map in which the differential limiting force of the differential limiting device during traveling on a general road is designated. , If the differential limiting force is set so that the differential limiting device also causes the differential limiting in the low vehicle speed range,
The differential limiting force of the differential limiting device frequently fluctuates between zero and the set value on the general road map with respect to frequent activation and non-operation of the foot brake in the low vehicle speed range during traveling on a general road. In a general control device for a differential limiting device, the differential limiting force is controlled by controlling the air pressure of the differential limiting device by means of an electromagnetic switching valve, so frequent fluctuations in the operating limiting force do not occur. The switching frequency of the electromagnetic switching valve is increased to make the control unstable.

【0006】さらに、一般道マップと雪道マップとの自
動切替はスリップ率等の検出に基づいて行われるので、
車両が一般道から雪道へ移るとき、雪道へ実際に移っ
て、スリップ率等が変化してから、雪道マップに切り替
わることになり、雪道へ移った当初は、なお、一般道マ
ップに基づいて差動制限装置の差動制限力の制御が行わ
れており、不適切になっている。
Furthermore, since automatic switching between the general road map and the snow road map is performed based on the detection of the slip ratio, etc.,
When a vehicle moves from a general road to a snow road, it will actually switch to the snow road, and after the slip ratio changes, it will switch to the snow road map. The differential limiting force of the differential limiting device is controlled based on the above, which is inappropriate.

【0007】請求項1の発明の目的は、一般道走行時の
低車速域における制御の安定性を高めることができる差
動制限装置の制御装置を提供することである。請求項2
の発明の目的は、車両が一般道から雪道へ移るときに雪
道マップへ速やかに切り替えることができる差動制限装
置の制御装置を提供することである。
An object of the invention of claim 1 is to provide a control device for a differential limiting device capable of enhancing the stability of control in a low vehicle speed range during traveling on a general road. Claim 2
SUMMARY OF THE INVENTION It is an object of the invention to provide a control device for a differential limiting device that can quickly switch to a snow road map when a vehicle moves from a general road to a snow road.

【0008】[0008]

【課題を解決するための手段】この発明を、実施例に対
応する図面の符号を使用して説明する。請求項1の前提
となる差動制限装置(10)は、差動制限力が調整自在であ
り、フートブレーキの作動時では差動制限を解除され
る。そして、請求項1の差動制限装置(10)の制御装置(1
2)は、低車速域では差動制限力を零とし中高車速域では
一般道の走行に適した差動制限力を指定する一般道マッ
プ(76)と、この一般道マップ(76)に基づいて差動制限装
置(10)の差動制限力を制御する制御手段(50)とを有して
なる。
The present invention will be described using reference numerals in the drawings corresponding to the embodiments. The differential limiting device (10) which is the premise of claim 1 is capable of adjusting the differential limiting force, and the differential limiting is released when the foot brake is actuated. And a control device (1) of the differential limiting device (10) according to claim 1.
2) is based on the general road map (76), which specifies the differential limiting force to be zero in the low vehicle speed range and specifies the differential limiting force suitable for running on the general road in the medium and high vehicle speed range, and this general road map (76). And a control means (50) for controlling the differential limiting force of the differential limiting device (10).

【0009】請求項2の前提となる差動制限装置(10)は
差動制限力が調整自在である。そして、請求項2の差動
制限装置(10)の制御装置(12)は、一般道の走行に適した
差動制限力を指定している一般道マップ(76)と、雪道の
走行に適した差動制限力を指定している雪道マップ(78)
と、一般道マップ(76)と雪道マップ(78)とが自動的に切
り替えられる自動モード(90)と雪道マップ(78)のみが選
択される雪道モード(92)とを切り替えるモード切替手段
(94)と、このモード切替手段(94)において切り替えられ
たモードに従って選択された一般道マップ(76)又は雪道
マップ(78)に基づいて差動制限装置(10)の差動制限力を
制御する制御手段(50)とを有してなる。
The differential limiting device (10) which is the premise of claim 2 is adjustable in differential limiting force. Then, the control device (12) of the differential limiting device (10) according to claim 2 is a general road map (76) which specifies a differential limiting force suitable for traveling on a general road, and a traveling road on a snowy road. Snow road map specifying the appropriate differential limiting force (78)
And, the mode switch to switch between the automatic mode (90) where the general road map (76) and the snow road map (78) are automatically switched and the snow road mode (92) where only the snow road map (78) is selected. means
(94) and the differential limiting force of the differential limiting device (10) based on the general road map (76) or the snow road map (78) selected according to the mode switched by the mode switching means (94). And a control means (50) for controlling.

【0010】[0010]

【作用】請求項1の差動制限装置(10)の制御装置(12)に
おいて、制御手段(50)は一般道マップ(76)に基づいて差
動制限装置(10)の差動制限力を制御する。低車速域で
は、差動制限装置(10)の差動制限力は零となり、すなわ
ち、差動制限装置(10)による差動制限は解除状態になっ
ている。
In the controller (12) of the differential limiting device (10) according to claim 1, the control means (50) controls the differential limiting force of the differential limiting device (10) based on the general road map (76). Control. In the low vehicle speed range, the differential limiting force of the differential limiting device (10) is zero, that is, the differential limiting device (10) is in the released state.

【0011】請求項2の差動制限装置(10)の制御装置(1
2)において、運転手は、モード切替手段(94)を操作し
て、自動モード(90)及び雪道モード(92)を切り替える。
自動モード(90)が選択された場合は、スリップ率等の検
出データから一般道走行か雪道走行かが自動判別され、
その判別結果に基づいて一般道マップ(76)又は雪道マッ
プ(78)が選択され、制御手段(50)は一般道マップ(76)及
び雪道マップ(78)の選択された方に基づいて差動制限装
置(10)の差動制限力を制御する。雪道モード(92)が選択
された場合は、制御手段(50)は雪道マップ(78)に基づい
て差動制限装置(10)の差動制限力を制御する。
A control device (1) for the differential limiting device (10) according to claim 2.
In 2), the driver operates the mode switching means (94) to switch between the automatic mode (90) and the snowy road mode (92).
When the automatic mode (90) is selected, it is automatically determined whether it is running on a general road or running on a snowy road from the detection data such as the slip ratio,
The general road map (76) or the snow road map (78) is selected based on the discrimination result, and the control means (50) is based on the selected one of the general road map (76) and the snow road map (78). Controls the limiting force of the limiting device (10). When the snow road mode (92) is selected, the control means (50) controls the differential limiting force of the differential limiting device (10) based on the snow road map (78).

【0012】[0012]

【実施例】以下、この発明を図面の実施例について説明
する。図4は差動制限装置10及びその制御装置12の構成
図である。差動制限装置10において、入力軸14は、車両
の前後方向へ延び、キャリアケース16に回転自在に軸支
され、先端にピニオン18を有している。駆動軸20a,20b
は、キャリアケース16の左右両側から車両の左右方向へ
水平に突出し、外側の端部において駆動輪(図示せず)
へ連結し、デフケース22は、駆動軸20a,20bの端部を包
囲している。リングギヤ24は、デフケース22と一体的に
回転し、ピニオン18にかみ合っている。スパイダ26は、
駆動軸20a,20bの端の間を貫通し、両端部においてデフ
ケース22に固定され、デフケース22と一体的に回転す
る。ピニオン28a,28bはスパイダ26に回転自在に軸支さ
れ、サイドギヤ30a,30bは、それぞれ駆動軸20a,20bの
端部にスプライン嵌合し、ピニオン28a,28bに同時にか
み合っている。多板クラッチ32は、デフケース22と内周
側において駆動軸20bにスプライン嵌合しているスリー
ブ34との接続を制御するもので、ピストン38を摺動自在
に内部に収容するシリンダ36を備える。シリンダ36内へ
の加圧エアの供給によりピストン38による押圧力が増大
し、多板クラッチ32の係合力が増大する。多板クラッチ
32の係合力が増大する程、駆動軸20bの回転速度がリン
グギヤ24の回転速度に接近し、差動制限装置10の差動制
限力が増大する。エアパイプ40は、ジョイントリング42
を介してシリンダ36内へ連通し、キャリアケース16内を
延びている。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the accompanying drawings. FIG. 4 is a block diagram of the differential limiting device 10 and its control device 12. In the differential limiting device 10, the input shaft 14 extends in the front-rear direction of the vehicle, is rotatably supported by the carrier case 16, and has a pinion 18 at its tip. Drive shafts 20a, 20b
Are horizontally projected from the left and right sides of the carrier case 16 in the left-right direction of the vehicle, and have drive wheels (not shown) at the outer end portions.
The differential case 22 surrounds the ends of the drive shafts 20a and 20b. The ring gear 24 rotates integrally with the differential case 22 and meshes with the pinion 18. Spider 26
It penetrates between the ends of the drive shafts 20a and 20b, is fixed to the differential case 22 at both ends, and rotates integrally with the differential case 22. The pinions 28a and 28b are rotatably supported by the spider 26, and the side gears 30a and 30b are spline-fitted to the ends of the drive shafts 20a and 20b, respectively, and are meshed with the pinions 28a and 28b at the same time. The multi-plate clutch 32 controls the connection between the differential case 22 and the sleeve 34 that is spline-fitted to the drive shaft 20b on the inner peripheral side, and includes a cylinder 36 that slidably accommodates the piston 38 therein. By supplying the pressurized air into the cylinder 36, the pressing force by the piston 38 increases, and the engaging force of the multi-plate clutch 32 increases. Multi-plate clutch
As the engaging force of 32 increases, the rotation speed of the drive shaft 20b approaches the rotation speed of the ring gear 24, and the differential limiting force of the differential limiting device 10 increases. Air pipe 40, joint ring 42
It communicates with the inside of the cylinder 36 via and extends inside the carrier case 16.

【0013】制御装置12において、第1の電磁切替弁44
は、加圧エアを貯蔵するエアタンク46とエアパイプ40と
の接続を制御し、第2の電磁切替弁48はエアパイプ40か
らの加圧エアの排出を制御する。CPU50は、多板クラ
ッチ32のシリンダ36内の圧力を検出する圧力センサ52、
車速を検出する車速センサ54、駆動輪の回転速度を検出
する車輪速度センサ56、及びフートブレーキ(図示せ
ず)の作動及び非作動を検出するブレーキセンサ58等か
らの検出データに基づいて第1の電磁切替弁44及び第2
の電磁切替弁48へ制御信号を送る。第1の電磁切替弁44
及び第2の電磁切替弁48がそれぞれ開及び閉であると
き、エアタンク46内の加圧エアが多板クラッチ32のシリ
ンダ36内へ導入され、差動制限装置10の差動制限力が増
大する。第1の電磁切替弁44及び第2の電磁切替弁48が
それぞれ閉及び開であるとき、多板クラッチ32のシリン
ダ36内から加圧エアが排出され、差動制限装置10の差動
制限力が減少する。
In the control device 12, the first electromagnetic switching valve 44
Controls the connection between the air tank 46 for storing the pressurized air and the air pipe 40, and the second electromagnetic switching valve 48 controls the discharge of the pressurized air from the air pipe 40. The CPU 50 has a pressure sensor 52 for detecting the pressure in the cylinder 36 of the multi-plate clutch 32,
The first based on detection data from a vehicle speed sensor 54 that detects the vehicle speed, a wheel speed sensor 56 that detects the rotational speed of the drive wheels, a brake sensor 58 that detects the operation and non-operation of a foot brake (not shown), and the like. Solenoid switching valve 44 and second
A control signal is sent to the electromagnetic switching valve 48 of. First solenoid switching valve 44
And when the second electromagnetic switching valve 48 is opened and closed, respectively, the pressurized air in the air tank 46 is introduced into the cylinder 36 of the multi-plate clutch 32, and the differential limiting force of the differential limiting device 10 is increased. .. When the first electromagnetic switching valve 44 and the second electromagnetic switching valve 48 are closed and open, respectively, pressurized air is discharged from the cylinder 36 of the multi-plate clutch 32, and the differential limiting force of the differential limiting device 10 is reduced. Is reduced.

【0014】図1は1例としての一般道マップ76及び雪
道マップ78において指定されている車速と差動制限装置
10の差動制限力との関係を示すグラフである。一般道マ
ップ76では、差動制限力は、低車速域に当たる0〜30
km/hにおいて零となってとおり、30km/hにおいて所
定値に立ち上がり、中車速域に当たる30〜70km/h
において漸増し、高車速域に当たる70km/h以上の範
囲では、完全な、すなわち100%の差動制限状態にな
っている。これに対し、雪道マップ78では、差動制限装
置10の差動制限力は、悪路からの車両の脱出を確保する
ため、低中車速域である0〜70km/hの範囲において
一般道マップ76の30km/hの時の値に保持され、70
〜140km/hの高車速域では70km/hの値から100
%まで漸増するように指定されている。なお、上記の数
値はあくまでも1例であり、これに限定されず、上記の
数値を車両により又は必要に応じて任意に変更すること
が可能である。
FIG. 1 shows a vehicle speed and a differential limiting device specified in a general road map 76 and a snow road map 78 as an example.
10 is a graph showing the relationship with 10 differential limiting forces. On the general road map 76, the differential limiting force is 0 to 30, which corresponds to the low vehicle speed range.
30 to 70 km / h, which is zero at 30 km / h and rises to a specified value at 30 km / h, which corresponds to the middle vehicle speed range
In the range of 70 km / h or more, which corresponds to a high vehicle speed range, it is in a complete, ie, 100%, differential limitation state. On the other hand, in the snow road map 78, the differential limiting force of the differential limiting device 10 ensures that the vehicle escapes from a rough road in the low to medium vehicle speed range of 0 to 70 km / h. It is maintained at the value at 30 km / h on Map 76, 70
In the high vehicle speed range of ~ 140km / h, the value of 70km / h becomes 100.
It is specified to gradually increase to%. Note that the above numerical values are merely examples, and the present invention is not limited to this, and the above numerical values can be arbitrarily changed depending on the vehicle or when necessary.

【0015】図3は差動制限装置10の制御のフローチャ
ートである。ステップ60において、故障診断、故障表示
が行われ、続いて、ステップ62において、作動表示が行
われる。ステップ64において、車輪速度、舵角及び車速
を入力し、これらに基づいて、ステップ66において、各
駆動輪ごとのスリップ率が算出される。発進時のスリッ
プ率は、ステップ68において記憶され、ステップ74にお
いて学習される。ステップ72では、スリップが両輪で生
じているかそれとも片輪のみかを判別し、両輪スリップ
であれば、ステップ82においてエア圧を減少させて、差
動制限装置10の差動制限力を低下させる。また、片輪ス
リップであれば、ステップ84においてエア圧を増大させ
て、差動制限装置10の差動制限力を増大させる。ステッ
プ72では、モードが自動モードか雪道モードかを判別
し、自動モードであれば、ステップ74の学習結果に基づ
いて一般道走行か雪道走行かを判別し、その判別結果に
基づいて一般道マップ76又は雪道マップ78を自動選択す
る。ステップ80において、圧力センサ52(図4)により
検出された多板クラッチ32のシリンダ36のエア圧Pと、
一般道マップ76又は雪道マップ78に基づいて算出された
エア圧P0とを比較し、P>P0のときはステップ82にお
いてシリンダ36内のエア圧を減少し、P<P0のときは
ステップ84においてシリンダ36内のエア圧を増大し、P
=P0のときはシリンダ36内のエア圧を維持する。
FIG. 3 is a flowchart of the control of the differential limiting device 10. In step 60, failure diagnosis and failure display are performed, and subsequently, in step 62, operation display is performed. In step 64, the wheel speed, the steering angle, and the vehicle speed are input, and based on these, the slip ratio for each drive wheel is calculated in step 66. The starting slip ratio is stored in step 68 and learned in step 74. In step 72, it is determined whether the slip occurs in both wheels or only one wheel. If both slips occur, the air pressure is reduced in step 82 to reduce the differential limiting force of the differential limiting device 10. If it is a one-wheel slip, the air pressure is increased in step 84 to increase the differential limiting force of the differential limiting device 10. In step 72, it is determined whether the mode is the automatic mode or the snowy road mode. If the mode is the automatic mode, it is determined whether the road is running on the ordinary road or the snowy road based on the learning result of step 74, and based on the result of the determination, the general mode is determined. The road map 76 or the snow road map 78 is automatically selected. In step 80, the air pressure P of the cylinder 36 of the multi-plate clutch 32 detected by the pressure sensor 52 (FIG. 4),
The air pressure P0 calculated based on the general road map 76 or the snow road map 78 is compared. When P> P0, the air pressure in the cylinder 36 is decreased in step 82, and when P <P0, the step 84 is executed. The air pressure in the cylinder 36 is increased to P
= P0, the air pressure in the cylinder 36 is maintained.

【0016】図2は制御装置12の制御ブロック図であ
る。CPU50は第1の電磁切替弁44及び第2の電磁切替
弁48の開閉を介して差動制限装置10の差動制限力を制御
する。モード切替手段94は、運転手により操作され、自
動モード90及び雪道モード92の一方を選択する。CPU
50は、さらに、車速、フートブレーキの作動状態等の各
種検出データを入力され、自動モード90が選択された場
合には、一般道走行か雪道走行かをスリップ率等から検
出して、それぞれ一般道マップ76及び雪道マップ78に基
づく差動制限力に差動制限装置10がなるように、第1の
電磁切替弁44及び第2の電磁切替弁48を制御し、雪道モ
ード92が選択されている場合には、雪道マップ78に基づ
く差動制限力に差動制限装置10がなるように、第1の電
磁切替弁44及び第2の電磁切替弁48を制御する。一般道
マップ76では、低車速域における差動制限装置10の差動
制限力が、図1に示されているように、零と指定されて
いるので、すなわち差動制限装置10の差動制限力を解除
する状態になっているので、フートブレーキの作動及び
非作動に関係なく、第1の電磁切替弁44及び第2の電磁
切替弁48はそれぞれ閉及び開に維持され、第1の電磁切
替弁44及び第2の電磁切替弁48の頻繁な切替が防止され
る。また、車両が一般道から雪道へ移るときは、運転手
が、移行と同時にモード切替手段94を操作して、雪道モ
ード92へ切り替えるので、雪道走行の初期から雪道マッ
プ78が使用され、差動制限装置10の差動制限力が適切に
なる。
FIG. 2 is a control block diagram of the controller 12. The CPU 50 controls the differential limiting force of the differential limiting device 10 by opening and closing the first electromagnetic switching valve 44 and the second electromagnetic switching valve 48. The mode switching means 94 is operated by the driver and selects one of the automatic mode 90 and the snowy road mode 92. CPU
In addition, 50 is input with various detection data such as vehicle speed and foot brake operating state, and when the automatic mode 90 is selected, it detects whether it is running on a general road or snowy road from the slip ratio, etc. The first electromagnetic switching valve 44 and the second electromagnetic switching valve 48 are controlled so that the differential limiting device 10 has a differential limiting force based on the general road map 76 and the snow road map 78, and the snow road mode 92 is set. When it is selected, the first electromagnetic switching valve 44 and the second electromagnetic switching valve 48 are controlled so that the differential limiting device 10 has a differential limiting force based on the snow road map 78. In the general road map 76, the differential limiting force of the differential limiting device 10 in the low vehicle speed range is designated as zero, as shown in FIG. Since the force is released, the first electromagnetic switching valve 44 and the second electromagnetic switching valve 48 are maintained closed and open regardless of whether the foot brake is activated or deactivated, and the first electromagnetic switching valve 44 and the second electromagnetic switching valve 48 are maintained. Frequent switching of the switching valve 44 and the second electromagnetic switching valve 48 is prevented. Further, when the vehicle shifts from a general road to a snowy road, the driver operates the mode switching means 94 at the same time as shifting to switch to the snowy road mode 92, so that the snowy road map 78 is used from the beginning of the snowy road running. As a result, the differential limiting force of the differential limiting device 10 becomes appropriate.

【0017】[0017]

【発明の効果】請求項1の発明では、一般道マップは、
低車速域における差動制限装置の差動制限力を零と指定
しており、これは差動制限装置の作動制限の解除と同じ
になっているので、一般道走行時の低車速域における頻
繁なフートブレーキの作動、及び非作動に対して、差動
制限装置の差動制限力の変動が抑制され、制御の安定性
を得ることができる。
According to the invention of claim 1, the general road map is
The differential limiting force of the differential limiting device in the low vehicle speed range is specified as zero, which is the same as the release of the operation limiting of the differential limiting device. The fluctuation of the differential limiting force of the differential limiting device is suppressed with respect to the operation and non-operation of the various foot brakes, and the stability of the control can be obtained.

【0018】請求項2の発明では、運転手の判断により
モード切替手段の操作により自動モードと雪道モードと
を切り替えれるようになっているので、一般道から雪道
への移行時では、移行とほぼ同時に雪道モードへ切り替
えられることにより、差動制限装置の差動制限力を雪道
走行の初期から雪道マップに基づいて制御することがで
きる。
According to the second aspect of the invention, the automatic mode and the snowy road mode can be switched by operating the mode switching means according to the judgment of the driver. By switching to the snow road mode almost at the same time, the differential limiting force of the differential limiting device can be controlled based on the snow road map from the beginning of snowy road running.

【図面の簡単な説明】[Brief description of drawings]

【図1】一般道マップ及び雪道マップにおいて指定され
ている車速と差動制限装置の差動制限力との関係を1例
として示すグラフである。
FIG. 1 is a graph showing, as an example, a relationship between a vehicle speed specified in a general road map and a snow road map and a differential limiting force of a differential limiting device.

【図2】制御装置の制御ブロック図である。FIG. 2 is a control block diagram of a control device.

【図3】差動制限装置の制御のフローチャートである。FIG. 3 is a flowchart of control of the differential limiting device.

【図4】差動制限装置及びその制御装置の構成図であ
る。
FIG. 4 is a block diagram of a differential limiting device and its control device.

【符号の説明】[Explanation of symbols]

10 差動制限装置 12 制御装置 50 CPU(制御手段) 76 一般道マップ 78 雪道マップ 90 自動モード 82 雪道モード 94 モード切替手段 10 differential limiting device 12 control device 50 CPU (control means) 76 general road map 78 snow road map 90 automatic mode 82 snow road mode 94 mode switching means

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 差動制限力が調整自在であり、フートブ
レーキの作動時では差動制限を解除される差動制限装置
(10)において、低車速域では差動制限力を零とし中高車
速域では一般道の走行に適した差動制限力を指定する一
般道マップ(76)と、この一般道マップ(76)に基づいて前
記差動制限装置(10)の差動制限力を制御する制御手段(5
0)とを有してなることを特徴とする差動制限装置の制御
装置。
1. A differential limiting device in which the differential limiting force is adjustable, and the differential limiting is released when the foot brake is actuated.
In (10), there are a general road map (76) that specifies the differential limiting force as zero in the low vehicle speed range and a differential limiting force that is suitable for running on the general road in the medium and high vehicle speed range, and this general road map (76). Based on the control means (5) for controlling the differential limiting force of the differential limiting device (10) based on
0) and a control device for a limited slip differential device.
【請求項2】 差動制限力が調整自在である差動制限装
置(10)において、一般道の走行に適した差動制限力を指
定している一般道マップ(76)と、雪道の走行に適した差
動制限力を指定している雪道マップ(78)と、前記一般道
マップ(76)と前記雪道マップ(78)とが自動的に切り替え
られる自動モード(90)と前記雪道マップ(78)のみが選択
される雪道モード(92)とを切り替えるモード切替手段(9
4)と、このモード切替手段(94)において切り替えられた
モードに従って選択された前記一般道マップ(76)又は前
記雪道マップ(78)に基づいて前記差動制限装置(10)の差
動制限力を制御する制御手段(50)とを有してなることを
特徴とする差動制限装置の制御装置。
2. A differential road limiting device (10) having an adjustable differential limiting force, wherein a general road map (76) specifying a differential limiting force suitable for running on a general road and a snow road A snow road map (78) that specifies a differential limiting force suitable for running, and an automatic mode (90) in which the general road map (76) and the snow road map (78) are automatically switched and Mode switching means (9) for switching between the snow road mode (92) in which only the snow road map (78) is selected
4) and the differential limiting device (10) based on the general road map (76) or the snow road map (78) selected according to the mode switched by the mode switching means (94). A control device for a differential limiting device, comprising a control means (50) for controlling force.
JP3356476A 1991-12-25 1991-12-25 Control device for differential limiting device Expired - Fee Related JP2722150B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3356476A JP2722150B2 (en) 1991-12-25 1991-12-25 Control device for differential limiting device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3356476A JP2722150B2 (en) 1991-12-25 1991-12-25 Control device for differential limiting device

Publications (2)

Publication Number Publication Date
JPH05170000A true JPH05170000A (en) 1993-07-09
JP2722150B2 JP2722150B2 (en) 1998-03-04

Family

ID=18449208

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3356476A Expired - Fee Related JP2722150B2 (en) 1991-12-25 1991-12-25 Control device for differential limiting device

Country Status (1)

Country Link
JP (1) JP2722150B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010149850A (en) * 2010-01-27 2010-07-08 Toyota Motor Corp Vehicle control device
US8447460B2 (en) 2007-11-20 2013-05-21 Toyota Jidosha Kabushiki Kaisha Vehicle operation method presentation device and method, and vehicle control device

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62275836A (en) * 1986-05-23 1987-11-30 Fuji Heavy Ind Ltd Torque distribution control device for four-wheel drive vehicle
JPS6311427A (en) * 1986-06-30 1988-01-18 Aisin Warner Ltd Four wheel drive vehicle

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62275836A (en) * 1986-05-23 1987-11-30 Fuji Heavy Ind Ltd Torque distribution control device for four-wheel drive vehicle
JPS6311427A (en) * 1986-06-30 1988-01-18 Aisin Warner Ltd Four wheel drive vehicle

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8447460B2 (en) 2007-11-20 2013-05-21 Toyota Jidosha Kabushiki Kaisha Vehicle operation method presentation device and method, and vehicle control device
US9128816B2 (en) 2007-11-20 2015-09-08 Toyota Jidosha Kabushiki Kaisha Vehicle operation method presentation device and method, and vehicle control device
JP2010149850A (en) * 2010-01-27 2010-07-08 Toyota Motor Corp Vehicle control device

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