JPH039472Y2 - - Google Patents
Info
- Publication number
- JPH039472Y2 JPH039472Y2 JP1984125908U JP12590884U JPH039472Y2 JP H039472 Y2 JPH039472 Y2 JP H039472Y2 JP 1984125908 U JP1984125908 U JP 1984125908U JP 12590884 U JP12590884 U JP 12590884U JP H039472 Y2 JPH039472 Y2 JP H039472Y2
- Authority
- JP
- Japan
- Prior art keywords
- wheel drive
- vehicle speed
- boundary
- vehicle
- switching
- 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
Links
- 230000001133 acceleration Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
Landscapes
- Arrangement And Mounting Of Devices That Control Transmission Of Motive Force (AREA)
- Feedback Control In General (AREA)
Description
【考案の詳細な説明】
産業上の利用分野
本考案は、二輪駆動と四輪駆動の切換えが可能
な四輪駆動車における切換制御の改良に関するも
のである。[Detailed Description of the Invention] Industrial Application Field The present invention relates to an improvement in switching control in a four-wheel drive vehicle capable of switching between two-wheel drive and four-wheel drive.
従来の技術
従来においても四輪駆動車はあつたが、運転者
の判断による手動操作で四輪駆動、そして二輪駆
動へと切換えるようにしたものであつた。Conventional Technology There have been four-wheel drive vehicles in the past, but they were designed to switch from four-wheel drive to two-wheel drive by manual operation based on the driver's judgment.
考案が解決しようとする課題
そして、従来の四輪駆動車が手動で運転者の判
断のもとに四輪駆動へ及び二輪駆動へと切換える
ものであつたため、その操作に煩らわしさがあつ
た。そこで、本考案の四輪駆動車は、発進時及び
低加速時に、低摩擦路であつてもスリツプしない
ように自動的に四輪駆動にし得るようにするもの
であつて、しかも、走行時に四輪駆動と二輪駆動
の切換が必要以上に頻繁に行われるのを防止する
ことを目的とするものである。Problems that the invention aims to solve Furthermore, because conventional four-wheel drive vehicles had to manually switch between four-wheel drive and two-wheel drive based on the driver's judgment, the operation was cumbersome. Ta. Therefore, the four-wheel drive vehicle of the present invention is capable of automatically switching to four-wheel drive when starting and at low acceleration to prevent slipping even on low-friction roads. The purpose of this is to prevent switching between wheel drive and two-wheel drive from being performed more frequently than necessary.
課題を解決するための手段
本考案は上記目的を鑑みて創案されたもので、
走行中の四輪駆動と二輪駆動との切換が車速によ
り制御される四輪駆動車において、増速時には車
速が比較的低速な第1境界車速を超えて同第1境
界車速より高速な第2境界車速以上になつた時に
駆動方式を四輪駆動から二輪駆動に切換え、減速
時には車速が上記第1境界車速以下になつた時に
駆動方式を二輪駆動から四輪駆動へ切換える手段
を有したことを特徴とするものである。Means for Solving the Problems This invention was devised in view of the above objectives.
In a four-wheel drive vehicle in which switching between four-wheel drive and two-wheel drive while driving is controlled by vehicle speed, when increasing speed, the vehicle speed exceeds a first boundary vehicle speed that is relatively low and a second boundary vehicle speed that is faster than the first boundary vehicle speed. The vehicle has a means for switching the drive system from four-wheel drive to two-wheel drive when the vehicle speed exceeds the threshold vehicle speed, and switching the drive system from two-wheel drive to four-wheel drive when the vehicle speed falls below the first threshold vehicle speed during deceleration. This is a characteristic feature.
作 用
加速時には、車速が第1境界車速を超えて同第
1境界車速より比較的高速な第2境界車速以上に
なつた時に駆動方式を四輪駆動から二輪駆動に切
換え、減速時には、車速が上記第1境界車速以下
になつた時に駆動方式を二輪駆動から四輪駆動へ
切換えるようにしたものである。Function When accelerating, the drive system is switched from four-wheel drive to two-wheel drive when the vehicle speed exceeds the first boundary vehicle speed and reaches a second boundary vehicle speed, which is relatively faster than the first boundary vehicle speed, and when decelerating, the vehicle speed changes. The drive system is switched from two-wheel drive to four-wheel drive when the vehicle speed falls below the first boundary speed.
実施例
以上、図示により説明すると、第1図に示す如
く、車速センサ1により車速をパルス信号として
検出し、演算手段2により演算する。この演算結
果は車速判定手段3に入力されるが、該車速判定
手段3には発進より必ず四輪駆動とされる低い車
速位置、即ち、第1境界車速(例えば30Km/h)
とそれよりやや高速な第2境界車速(例えば40
Km/h)とを設定してある。そして、入力された
車速信号の属する車速区画を判定し、その判定さ
れた車速区画が出力判断手段4へ出力される。こ
の信号を受けた出力判断手段4では、上記第1境
界車速以下のときは必ず四輪駆動とし、上記第1
境界車速から上記第2境界車速までは、加速時に
は四輪駆動とし、減速時には二輪駆動とする判断
をして出力として4WD切換手段のソレノイド5
に発信し励磁させる。また、上記第2境界車速を
越えたときには、タイマ6により一定時間がカウ
ントされ、一定時間内であるときは、加速時は四
輪駆動へ、減速時は二輪駆動とする命令をソレノ
イドに発信する。なお、ここでは演算手段2、車
速判定手段3、出力判断手段4及びタイマ6がコ
ントローラCに一体に組込まれている。Embodiment To explain the above using illustrations, as shown in FIG. 1, the vehicle speed is detected as a pulse signal by the vehicle speed sensor 1, and is calculated by the calculation means 2. This calculation result is input to the vehicle speed determining means 3, which determines the low vehicle speed position where four-wheel drive is always applied from the start, that is, the first boundary vehicle speed (for example, 30 km/h).
and a second boundary vehicle speed that is slightly higher than that (for example, 40
km/h). Then, the vehicle speed section to which the input vehicle speed signal belongs is determined, and the determined vehicle speed section is output to the output determining means 4. Upon receiving this signal, the output determining means 4 always selects four-wheel drive when the vehicle speed is below the first boundary speed.
From the boundary vehicle speed to the above-mentioned second boundary vehicle speed, it is determined that four-wheel drive is used during acceleration and two-wheel drive is used during deceleration, and the solenoid 5 of the 4WD switching means is output.
It transmits and excite it. Additionally, when the second boundary vehicle speed is exceeded, the timer 6 counts a certain period of time, and if it is within the certain period of time, a command is sent to the solenoid to switch to four-wheel drive when accelerating and to two-wheel drive when decelerating. . Note that here, the calculation means 2, the vehicle speed determination means 3, the output determination means 4, and the timer 6 are integrated into the controller C.
上述したコントローラCを備えた四輪駆動車
は、第2図、第3図に示す如く、コントローラC
の制御によりソレノイド5が励磁され、アクチユ
エータ7が作動し、該アクチユエータの作動で四
輪駆動切換クラツチ8が操作され、該クラツチが
入れられたときにはエンジン9からの駆動トルク
をプロペラシヤフト10を介して後輪11に伝達
させて四輪駆動とし、クラツチが入らないときに
は駆動トルクがプロペラシヤフト10に伝達され
ずに二輪駆動とするように構成されている。 A four-wheel drive vehicle equipped with the controller C described above is equipped with a controller C as shown in FIGS. 2 and 3.
The solenoid 5 is energized and the actuator 7 is operated, and the actuation of the actuator operates the four-wheel drive switching clutch 8. When the clutch is engaged, the drive torque from the engine 9 is transferred via the propeller shaft 10. The driving torque is transmitted to the rear wheels 11 to provide four-wheel drive, and when the clutch is not engaged, the driving torque is not transmitted to the propeller shaft 10, resulting in two-wheel drive.
なお、12はフロントデイフアレンシヤルであ
り、13はリヤデイフアレンシヤルである。 Note that 12 is a front differential, and 13 is a rear differential.
以上を第4図に示すフローチヤート基づいて説
明すると、検出された車速が第1境界車速(例え
ば30Km/h)以下ならば、4WDフラグのセツト
がなされて四輪駆動となる。また、車速が上記第
1境界車速以上でかつ第2境界車速(例えば40
Km/h)未満の場合は、車速の増加する加速状態
時には四輪駆動に、反対の減速状態時には二輪駆
動に各々切換えられる。さらに、車速が上記第2
境界車速以上の場合には4WDフラグがリセツト
されて二輪駆動となる。 The above will be explained based on the flowchart shown in FIG. 4. If the detected vehicle speed is below the first boundary vehicle speed (for example, 30 km/h), the 4WD flag is set and the vehicle becomes 4-wheel drive. Further, the vehicle speed is equal to or higher than the first boundary vehicle speed and the second boundary vehicle speed (for example, 40
Km/h), the vehicle is switched to four-wheel drive during an acceleration state where the vehicle speed increases, and to two-wheel drive during a deceleration state. Furthermore, the vehicle speed is the second
If the vehicle speed is above the boundary speed, the 4WD flag is reset and the vehicle becomes two-wheel drive.
考案の効果
以上から明らかなように、本考案によれば、旋
回時において四輪駆動と二輪駆動の切換によるコ
ーナリング特性の変化を極力抑えることができる
ので、ドライバーが想定する軌跡を車両が乱すこ
となく安定した旋回をすることができると共に、
直進時においても四輪駆動と二輪駆動の切換によ
る車両の挙動に変化を極力抑えることができると
いう効果を奏する。また、切換え操作が自動的に
なされるため、運転者の煩らわしさも解消され
る。Effects of the invention As is clear from the above, according to the invention, changes in cornering characteristics caused by switching between four-wheel drive and two-wheel drive when turning can be minimized, so that the vehicle does not disturb the trajectory expected by the driver. In addition to being able to make stable turns without
This has the effect of minimizing changes in vehicle behavior caused by switching between four-wheel drive and two-wheel drive even when driving straight. Furthermore, since the switching operation is performed automatically, the driver's annoyance is eliminated.
第1図は本考案の発進より低車速までの四輪駆
動を制御するコントローラの機能を実現するブロ
ツク図であり、第2図はコントローラにより制御
された四輪駆動車の全体配置図であり、第3図は
コントローラのハードウエア関連図であつて、第
4図はコントローラのソフトウエアを示すフロー
チヤートである。
1……車速センサ、2……演算手段、3……車
速判定手段、4……出力判断手段、5……ソレノ
イド、6……タイマ、7……アクチユエータ、8
……4WD切換クラツチ、10……プロペラシヤ
フト。
Fig. 1 is a block diagram that realizes the function of the controller that controls four-wheel drive from start to low vehicle speed according to the present invention, and Fig. 2 is an overall layout diagram of a four-wheel drive vehicle controlled by the controller. FIG. 3 is a diagram related to the hardware of the controller, and FIG. 4 is a flowchart showing the software of the controller. DESCRIPTION OF SYMBOLS 1... Vehicle speed sensor, 2... Calculating means, 3... Vehicle speed determining means, 4... Output determining means, 5... Solenoid, 6... Timer, 7... Actuator, 8
...4WD switching clutch, 10...propeller shaft.
Claims (1)
より制御される四輪駆動車において、増速時には
車速が比較的低減な第1境界車速を超えて同第1
境界車速より高速の第2境界車速以上になつた時
に駆動方式を四輪駆動から二輪駆動に切換え、減
速時には車速が上記第1境界車速以下となつた時
に駆動方式を二輪駆動から四輪駆動へ切換える手
段を有したことを特徴とする四輪駆動車。 In a four-wheel drive vehicle in which switching between four-wheel drive and two-wheel drive while driving is controlled by vehicle speed, when increasing speed, the vehicle speed exceeds a relatively low first boundary vehicle speed.
When the vehicle speed reaches a second boundary vehicle speed higher than the boundary vehicle speed, the drive system is switched from four-wheel drive to two-wheel drive, and during deceleration, when the vehicle speed falls below the first boundary vehicle speed, the drive system is changed from two-wheel drive to four-wheel drive. A four-wheel drive vehicle characterized by having a means for switching.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12590884U JPS6141035U (en) | 1984-08-21 | 1984-08-21 | four wheel drive vehicle |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12590884U JPS6141035U (en) | 1984-08-21 | 1984-08-21 | four wheel drive vehicle |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6141035U JPS6141035U (en) | 1986-03-15 |
JPH039472Y2 true JPH039472Y2 (en) | 1991-03-08 |
Family
ID=30684596
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP12590884U Granted JPS6141035U (en) | 1984-08-21 | 1984-08-21 | four wheel drive vehicle |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6141035U (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0794209B2 (en) * | 1986-06-30 | 1995-10-11 | アイシン精機株式会社 | Control device for four-wheel drive vehicle |
GB2488527A (en) * | 2011-02-18 | 2012-09-05 | Land Rover Uk Ltd | Vehicle with speed threshold for transition to two or multi wheel drive |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5513103B2 (en) * | 1974-10-14 | 1980-04-07 |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS619791Y2 (en) * | 1978-07-12 | 1986-03-28 |
-
1984
- 1984-08-21 JP JP12590884U patent/JPS6141035U/en active Granted
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5513103B2 (en) * | 1974-10-14 | 1980-04-07 |
Also Published As
Publication number | Publication date |
---|---|
JPS6141035U (en) | 1986-03-15 |
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