JPH078615B2 - Power transmission device for four-wheel drive vehicle - Google Patents
Power transmission device for four-wheel drive vehicleInfo
- Publication number
- JPH078615B2 JPH078615B2 JP29912986A JP29912986A JPH078615B2 JP H078615 B2 JPH078615 B2 JP H078615B2 JP 29912986 A JP29912986 A JP 29912986A JP 29912986 A JP29912986 A JP 29912986A JP H078615 B2 JPH078615 B2 JP H078615B2
- Authority
- JP
- Japan
- Prior art keywords
- electric motor
- output
- power transmission
- set value
- transmission device
- 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 - Fee Related
Links
Landscapes
- Arrangement And Driving Of Transmission Devices (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は電動機による発電制動を利用した四輪駆動車の
動力伝達装置に関する。Description: TECHNICAL FIELD The present invention relates to a power transmission device for a four-wheel drive vehicle using dynamic braking by an electric motor.
（従来の技術） 本出願人は先に特願昭61−215375号において、駆動装置
の回転トルクを主駆動輪に直結して伝達するとともに従
駆動輪には、回転子と固定子の何れか一方に設けられた
出力端子に抵抗器を接続して成る電動機を介して伝達す
るようにした四輪駆動車（以下に4WD車と略称する）の
動力伝達装置を提案した。これによれば、電動機の発電
制動によって差回転−伝達トルク特性を容易、且つ広範
囲に変更することができる。(Prior Art) In the Japanese Patent Application No. 61-215375, the present applicant directly transmits the rotational torque of the driving device to the main driving wheel and transmits the rotational torque of the driving device to either the rotor or the stator. We proposed a power transmission device for a four-wheel drive vehicle (hereinafter abbreviated as a 4WD vehicle) in which transmission is performed via an electric motor in which a resistor is connected to an output terminal provided on one side. According to this, the differential rotation-transmission torque characteristic can be easily and widely changed by power generation braking of the electric motor.
（発明が解決しようとする問題点） ところが、電動機の出力端子を一定の負荷抵抗に接続し
ただけだと、電動機は回転数に比例した出力電流を発生
するため、高回転では電動機の吸収馬力と出力トルクが
過大となり、このために電動機の容量を大きくする必要
があり、装置の大型化、重量化を招くことになる。(Problems to be solved by the invention) However, if the output terminal of the electric motor is simply connected to a constant load resistance, the electric motor generates an output current proportional to the number of rotations. The output torque becomes excessively large, which makes it necessary to increase the capacity of the electric motor, resulting in an increase in size and weight of the device.
そこで本発明の目的は、回転トルクを従駆動輪に伝達す
る電動機の最大トルク、電流を制限することによって、
不必要に過大となるトルク、電流の発生を防止し、電動
機の容量を小さくして軽量コンパクト化が図れるように
した4WD車の動力伝達装置を提供するにある。Therefore, an object of the present invention is to limit the maximum torque and current of the electric motor that transmits the rotational torque to the driven wheels,
The purpose of the present invention is to provide a power transmission device for a 4WD vehicle that prevents unnecessary generation of excessive torque and current, reduces the capacity of the electric motor, and makes it lightweight and compact.
（問題点を解決するための手段） 以上の目的を達成すべく本発明は、駆動装置（１）の回
転トルクを主駆動輪（４），（４）に直結して伝達する
一方、従駆動輪（７），（７）には電動機（11）を介し
て伝達するようにした4WD車において、設定値以上の回
転数における電動機（11）の出力電流を設定値以下に制
限する制御装置（21）を設けたことを特徴とする。(Means for Solving the Problems) In order to achieve the above object, the present invention transmits the rotational torque of the drive device (1) directly to the main drive wheels (4) and (4) while transmitting the drive torque. In a 4WD vehicle in which the wheels (7) and (7) are transmitted via the electric motor (11), a control device that limits the output current of the electric motor (11) at a rotational speed equal to or higher than a set value to a value equal to or lower than the set value ( 21) is provided.
（作用） 電動機（11）の差回転（w1−w2）が設定値以上になる
と、その出力電流（ｉ）は制御装置（21）により設定値
以下に制限されるので、この出力電流（ｉ）に応じて出
力トルク（Ｔ）も一定値以下に制限される。即ち差回転
（w1−w2）が設定値以上に増えても、出力トルク（Ｔ）
は増えないので、差回転に出力電流を比例させたものに
比べて電動機（11）の出力軸の応力及び電流による発熱
が大幅に減少する。これにより電動機（11）の容量を小
さくして軽量コンパクト化を達成できる。(Operation) When the differential rotation (w 1 −w 2 ) of the electric motor (11) exceeds the set value, the output current (i) is limited to the set value or less by the control device (21). The output torque (T) is also limited to a certain value or less according to i). That differential rotation (w 1 -w 2) be increased to the set value or more, the output torque (T)
Does not increase, the heat generation due to the stress and current on the output shaft of the electric motor (11) is greatly reduced compared to the case where the output current is proportional to the differential rotation. As a result, the capacity of the electric motor (11) can be reduced to achieve a lightweight and compact design.
（実施例） 以下に添付図面を基に実施例を説明する。(Examples) Examples will be described below with reference to the accompanying drawings.
第１図は本発明を適用した4WD車のパワートレインの一
例を示し、（１）はエンジンとトランスミッションから
成る駆動装置、（２）は推進軸、（３）はフロントデ
フ、（４）は主駆動輪をなす左右の前輪、（５）はその
駆動軸、（６）はリヤデフ、（７）は従駆動輪をなす左
右の後輪，（８）はその駆動軸であり、推進軸（２）を
リヤデフ（６）の手前で分割し、その分割部分には電動
機（11）を介設する。FIG. 1 shows an example of a power train of a 4WD vehicle to which the present invention is applied. (1) is a drive unit including an engine and a transmission, (2) is a propulsion shaft, (3) is a front differential, and (4) is a main The left and right front wheels that form the drive wheels, (5) the drive shaft, (6) the rear differential, (7) the left and right rear wheels that form the driven wheels, and (8) the drive shaft, the propulsion shaft (2 ) Is divided in front of the rear differential (6), and an electric motor (11) is interposed in the divided portion.
第２図にも示す如く電動機（11）は、回転子（12）と、
そのハウジングをなす固定子（13）と、回転子（12）に
設けた出力端子（14）に接続される抵抗器（15）とから
成り、固定子（13）を駆動装置（１）側に連結してい
る。これによれば、固定子（13）を入力軸、回転軸（1
2）を出力軸として抵抗器（15）の負荷抵抗（Ｒ）に応
じた発動制御が行なわれ、一般にその出力トルク（Ｔ）
は入出力軸の差回転（w1−w2）に応じて発生する。As shown in FIG. 2, the electric motor (11) includes a rotor (12),
It consists of a stator (13) that forms the housing and a resistor (15) connected to an output terminal (14) provided on the rotor (12). The stator (13) is placed on the drive device (1) side. It is connected. According to this, the stator (13) is connected to the input shaft and the rotary shaft (1
Actuation control is performed according to the load resistance (R) of the resistor (15) with 2) as the output shaft, and its output torque (T) is generally used.
Is generated according to the differential rotation (w 1 −w 2 ) of the input / output shaft.
斯かる電動機（11）の制御装置（21）は、マイクロコン
ピュータ（22）と、デジタル・アナログ変換器（26）
と、定電流回路（27）を構成するアンプ（28）、電界効
果トランジスタ（29）及び前記抵抗器（15）と、電動機
（11）の端子電圧（v1）を増幅する差動増幅器（16）と
から成る。マイクロコンピュータ（22）はROM（23）、C
PU（24）及び入出力回路（25）等を備え、端子電圧
（v1）は差動増幅器（16）から入出力回路（25）を介し
てマイクロコンピュータ（22）に取込まれる。The control device (21) for such an electric motor (11) includes a microcomputer (22) and a digital-analog converter (26).
An amplifier (28), a field effect transistor (29) and the resistor (15) that form a constant current circuit (27), and a differential amplifier (16) that amplifies the terminal voltage (v 1 ) of the electric motor (11). ) And. Microcomputer (22) is ROM (23), C
It has a PU (24), an input / output circuit (25) and the like, and the terminal voltage (v 1 ) is taken from the differential amplifier (16) into the microcomputer (22) via the input / output circuit (25).
ここで、電動機（11）の端子電圧（v1）は差回転（w1−
w2）にほぼ比例する。Here, the terminal voltage (v 1 ) of the electric motor (11) is the differential rotation (w 1 −
almost proportional to w 2 ).
そして前記定電流回路（27）は、デジタル・アナログ変
換器（26）を介してマイクロコンピュータ（22）から出
力される制御電圧（v2）に応じて抵抗器（15）を流れる
電動機（11）の出力電流（ｉ）を制御するもので、例え
ばその制御電圧（v2）がマップとしてROM（23）に格納
されている。斯かる制御電圧（v2）は、端子電圧（v1）
に対応した信号によりアクセスされ、前記定電流回路
（27）に出力される。而して電動機（11）の出力トルク
（Ｔ）が不必要に過大となる時の差回転（W0）に相当す
る電圧値（v0）に端子電圧（v1）が達するまでは出力電
流（ｉ）を、ｉ＝v1/Rの関係に保ち、端子電圧（v1）が
電圧値（v0）以上では出力電流（ｉ）を、ｉ＝v0/Rに制
限するよう前記制御電圧（v2）を予め設定する。The constant current circuit (27) is a motor (11) that flows through a resistor (15) according to a control voltage (v 2 ) output from a microcomputer (22) via a digital-analog converter (26). Of the control current (i), and its control voltage (v 2 ) is stored in the ROM (23) as a map. The control voltage (v 2 ) is the terminal voltage (v 1 )
Is accessed by a signal corresponding to and output to the constant current circuit (27). Therefore, the output current until the terminal voltage (v 1 ) reaches the voltage value (v 0 ) corresponding to the differential rotation (W 0 ) when the output torque (T) of the electric motor (11) becomes unnecessarily excessive. The above control is performed so that (i) is kept in the relationship of i = v 1 / R and the output current (i) is limited to i = v 0 / R when the terminal voltage (v 1 ) is equal to or higher than the voltage value (v 0 ). The voltage (v 2 ) is preset.
以上の電流制御によれば、電動機（11）の出力トルク
（Ｔ）は、出力電流（ｉ）及び制御電圧（v2）に比例関
係にあるので、第４図に示す如き出力トルク特性が得ら
れる。そして電動機（11）の発生馬力、即ちパワー
（Ｐ）は、Ｐ＝Ｔ×（w1−w2）であるから、第５図に示
す如きパワー特性が得られる。According to the above current control, the output torque (T) of the electric motor (11) is proportional to the output current (i) and the control voltage (v 2 ), so that the output torque characteristic as shown in FIG. 4 is obtained. To be The occurrence horsepower of the electric motor (11), or power (P), since a P = T × (w 1 -w 2), the power characteristic as shown in FIG. 5 is obtained.
このように、v1＜v0では、v1に比例する出力トルク
（Ｔ）と、v1の２乗に応じたパワー（Ｐ）とが得られ
る。そして、v1≧v0になると、Ｔは一定に保たれ、Ｐは
v1に比例する。尚、特性図中、k1,k0は定数である。Thus, when v 1 <v 0 , the output torque (T) proportional to v 1 and the power (P) corresponding to the square of v 1 are obtained. Then, when v 1 ≧ v 0 , T is kept constant and P is
proportional to v 1 . In the characteristic diagram, k 1 and k 0 are constants.
ところで、以上の制御では、v1≧v0で出力トルク（Ｔ）
は一定になり、機械的な強度面での制限を行えるが、パ
ワー（Ｐ）は差回転に比例して増加し、電動機（11）の
発熱が問題になることがある。By the way, in the above control, when v 1 ≧ v 0 , the output torque (T)
Becomes constant and the mechanical strength can be limited, but the power (P) increases in proportion to the differential rotation, and heat generation of the electric motor (11) may become a problem.
そこで、v0以上の差回転でトルクが必要ない場合には、
第６図のように、v0以上の回転数で電流値（ｉ）を回転
数の逆数に比例して制御することにより、第７図に示す
如くパワー（Ｐ）を一定に保つことができる。Therefore, when torque is not required for differential rotation of v 0 or more,
As shown in FIG. 6, by controlling the current value (i) in proportion to the reciprocal of the rotational speed at the rotational speed of v 0 or higher, the power (P) can be kept constant as shown in FIG. .
次に第３図は制御装置（21）の第２実施例を示し、本実
施例では差動増幅器（16）に代えて電動機（11）の入出
力回転数を回転数検出器（17），（18）によりそれぞれ
ピックアップし、これにより差回転を検出して以下は同
様の制御を行うようにした。Next, FIG. 3 shows a second embodiment of the control device (21). In this embodiment, the input / output rotational speed of the electric motor (11) is replaced by the rotational speed detector (17) instead of the differential amplifier (16). (18) picked up each, and the differential rotation was detected by this, and the same control was performed thereafter.
尚、4WD車のパワートレイン及び電動機の入出力関係は
実施例構造のみに限られるものではない。The input / output relationship of the power train and the electric motor of the 4WD vehicle is not limited to the structure of the embodiment.
（発明の効果） 以上のように本発明によれば、駆動装置の回転トルクを
主駆動輪に直結して伝達する一方、従駆動輪には電動機
を介して伝達するようにした4WD車において、設定値以
上の回転数における電動機の出力電流を設定値以下に制
限する制御装置を設けたため、不必要に過大となるトル
クの発生を防止することができ、従って電動機の容量を
小さくして軽量コンパクト化を達成することができる。(Effects of the Invention) As described above, according to the present invention, in the 4WD vehicle in which the rotation torque of the drive device is directly connected to the main drive wheels and is transmitted, while the sub-drive wheels are transmitted via the electric motor, Since a control device that limits the output current of the electric motor at the number of revolutions above the set value to the set value or less is provided, it is possible to prevent the generation of unnecessarily excessive torque, thus reducing the capacity of the electric motor and making it lightweight and compact. Can be achieved.
第１図は本発明を適用した4WD車の一例を示すパワート
レイン図、第２図は電動機及び第１実施例に係る制御装
置の構成図、第３図は第２実施例を示す同様の構成図、
第４図及び第５図は設定値以上の回転数で出力電流を一
定に維持する制御によるトルク特性図とパワー特性図、
第６図及び第７図は同出力電流を回転数の逆数に比例し
て制御した場合のトルク特性図とパワー特性図である。 尚、図面中（１）は駆動装置、（２）は推進軸、（３）
はフロントデフ、（４）は主駆動輪、（５）は駆動軸、
（６）はリヤデフ、（７）は従駆動輪、（８）は駆動
軸、（11）は電動機、（12）は回転子、（13）は固定
子、（14）は出力端子、（15）は抵抗器、（16）は差動
増幅器、（17），（18）は回転数検出器、（21）は制御
装置、（22）はマイクロコンピュータ、（26）はデジタ
ル・アナログ変換器、（27）は定電流回路、（28）はア
ンプ、（29）は電界効果トランジスタである。FIG. 1 is a powertrain diagram showing an example of a 4WD vehicle to which the present invention is applied, FIG. 2 is a configuration diagram of an electric motor and a control device according to the first embodiment, and FIG. 3 is a similar configuration showing the second embodiment. Figure,
FIG. 4 and FIG. 5 are a torque characteristic diagram and a power characteristic diagram under the control of keeping the output current constant at the rotational speed higher than the set value,
6 and 7 are a torque characteristic diagram and a power characteristic diagram when the same output current is controlled in proportion to the reciprocal of the rotational speed. In the drawing, (1) is a drive device, (2) is a propulsion shaft, and (3)
Is the front differential, (4) is the main drive wheel, (5) is the drive shaft,
(6) is a rear differential, (7) is a driven wheel, (8) is a drive shaft, (11) is an electric motor, (12) is a rotor, (13) is a stator, (14) is an output terminal, (15) ) Is a resistor, (16) is a differential amplifier, (17) and (18) are rotation speed detectors, (21) is a controller, (22) is a microcomputer, (26) is a digital-analog converter, (27) is a constant current circuit, (28) is an amplifier, and (29) is a field effect transistor.
Claims (3)
て伝達するとともに従駆動輪には、回転子と固定子の何
れか一方に設けられた出力端子に抵抗器を接続して成る
電動機を介して伝達するようにした四輪駆動車におい
て、 設定値以上の回転数における前記電動機の出力電流を設
定値以下に制限する制御装置を設けたこと、 を特徴とする四輪駆動車の動力伝達装置。1. A rotary torque of a drive device is directly connected to a main drive wheel for transmission, and a resistance is connected to an output terminal provided on either the rotor or the stator of the sub drive wheel. In a four-wheel drive vehicle configured to transmit via an electric motor, a control device for limiting the output current of the electric motor at a rotation speed equal to or higher than a set value to a set value or less is provided, Power transmission device.
前記出力電流を一定に維持して制御すること、 を特徴とする四輪駆動車の動力伝達装置。2. The four-wheel drive system according to claim 1, wherein the control device controls the output current by keeping the output current constant when the rotation speed of the electric motor is equal to or higher than a set value. Vehicle power transmission device.
前記出力電流を該回転数の逆数に比例して制御するこ
と、 を特徴とする四輪駆動車の動力伝達装置。3. The control device according to claim 1, wherein the control device controls the output current in proportion to a reciprocal of the rotational speed when the rotational speed of the electric motor is equal to or higher than a set value. Power transmission device for four-wheel drive vehicle.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29912986A JPH078615B2 (en) | 1986-12-16 | 1986-12-16 | Power transmission device for four-wheel drive vehicle |
| DE19873730653 DE3730653A1 (en) | 1986-09-12 | 1987-09-11 | POWER TRANSMISSION DEVICE FOR VEHICLE WITH FOUR-WHEEL DRIVE |
| GB8721549A GB2194928B (en) | 1986-09-12 | 1987-09-14 | Power transmitting apparatus for four-wheel-drive vehicle |
| FR8712700A FR2603847A1 (en) | 1986-09-12 | 1987-09-14 | POWER TRANSMISSION DEVICE FOR A FOUR-DRIVE VEHICLE |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29912986A JPH078615B2 (en) | 1986-12-16 | 1986-12-16 | Power transmission device for four-wheel drive vehicle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63151521A JPS63151521A (en) | 1988-06-24 |
| JPH078615B2 true JPH078615B2 (en) | 1995-02-01 |
Family
ID=17868498
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29912986A Expired - Fee Related JPH078615B2 (en) | 1986-09-12 | 1986-12-16 | Power transmission device for four-wheel drive vehicle |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH078615B2 (en) |
-
1986
- 1986-12-16 JP JP29912986A patent/JPH078615B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63151521A (en) | 1988-06-24 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |