JP2006290041A - Electric power steering control device - Google Patents

Electric power steering control device Download PDF

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JP2006290041A
JP2006290041A JP2005110048A JP2005110048A JP2006290041A JP 2006290041 A JP2006290041 A JP 2006290041A JP 2005110048 A JP2005110048 A JP 2005110048A JP 2005110048 A JP2005110048 A JP 2005110048A JP 2006290041 A JP2006290041 A JP 2006290041A
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heat sink
control device
steering control
electric power
side heat
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JP4203035B2 (en
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Takayasu Ubukawa
貴康 生川
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To obtain an electric power steering control device which easily responds to the shape change of the part to be mounted by an existing manufacturing facility, simplifies the inventory management, and reduces the manufacturing cost. <P>SOLUTION: The electric power steering control device controls the drive of an electric motor outputting an auxiliary torque to a steering wheel of a vehicle, and is mounted to the part to be mounted. The electric power steering control device is equipped with a power substrate 1 having a bridge circuit composed of a plurality of semiconductor switching elements 7 for switching a current of the electric motor according to the auxiliary torque for the steering wheel, and a heat sink 4 provided on the power substrate 1 while making surface contact with it. The heat sink 4 is divided into a substrate side heat sink part 4A of the power substrate 1 side and a vehicle side heat sink part 4B mounted to the vehicle. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

この発明は、車両のハンドルに補助トルクを出力する電動モータの駆動を制御するとともに、被取付部に取り付けられる電動式パワーステアリング制御装置に関するものである。   The present invention relates to an electric power steering control device that controls driving of an electric motor that outputs auxiliary torque to a steering wheel of a vehicle and is attached to a mounted portion.

従来、ハンドルに対して補助するトルクに応じて電動モータの電流を切り換えるための複数の半導体スイッチング素子からなるブリッジ回路が搭載されたパワー基板と、このパワー基板に面接触して設けられたヒートシンクとを備え、ヒートシンクが車両の被取付部に取り付けられる電動式パワーステアリング制御装置が知られている（例えば、特許文献１参照）。   Conventionally, a power board on which a bridge circuit composed of a plurality of semiconductor switching elements for switching the current of the electric motor according to torque assisting the handle is mounted, and a heat sink provided in surface contact with the power board, There is known an electric power steering control device in which a heat sink is attached to a mounted portion of a vehicle (see, for example, Patent Document 1).

特許第３５５６１２１号公報（図１）。Japanese Patent No. 3556121 (FIG. 1).

上記構成の電動式パワーステアリング制御装置では、被取付部の形状変更に伴い、ヒートシンク全体の形状を変更しなければならないが、その変更内容によっては既存の製造設備で対応することが困難であるという問題点があった。
また、被取付部の形状変更に伴い、それに対応することができるヒートシンクを個別に揃えなければならず、それだけ在庫管理が困難になるという問題点もあった。
またヒートシンクの仕様変更に伴い、ヒートシンクと面接触したパワー基板等も個別に揃えなければならず、それらの在庫管理も困難になるという問題点もあった。
そして、上述した問題点は、何れも製造コストの増大につながるという問題点でもあった。 In the electric power steering control device configured as described above, the shape of the entire heat sink must be changed along with the change in the shape of the mounted portion, but depending on the content of the change, it is difficult to cope with existing manufacturing equipment. There was a problem.
In addition, with the change in the shape of the mounted portion, it is necessary to separately prepare heat sinks that can cope with it, and there is a problem that inventory management becomes difficult accordingly.
In addition, with the change in specifications of the heat sink, power boards and the like that are in surface contact with the heat sink must be individually prepared, and there is also a problem that inventory management thereof becomes difficult.
The above-mentioned problems are all problems that lead to an increase in manufacturing cost.

この発明は、上記のような問題点を解決するためになされたもので、被取付部の形状変更に対して、既存の製造設備で対応し易くなるとともに、在庫管理も簡単化され、製造コストが低減される電動式パワーステアリング制御装置を提供することを目的とする。   The present invention has been made to solve the above-described problems, and it is easy to cope with a change in the shape of the attached portion with existing manufacturing equipment, and the inventory management is simplified, thereby reducing the manufacturing cost. It is an object of the present invention to provide an electric power steering control device in which the power consumption is reduced.

この発明に係る電動式パワーステアリング制御装置は、車両のハンドルに補助トルクを出力する電動モータの駆動を制御し、被取付部に取り付けられる電動式パワーステアリング制御装置であって、前記ハンドルに対して補助するトルクに応じて前記電動モータの電流を切り換えるための複数の半導体スイッチング素子からなるブリッジ回路が搭載されたパワー基板と、このパワー基板に面接触して設けられたヒートシンクとを備え、前記ヒートシンクは、パワー基板側の基板側ヒートシンク部と、前記被取付部に取り付けられる被取付部側ヒートシンク部とに２分割されている。   An electric power steering control device according to the present invention is an electric power steering control device that controls driving of an electric motor that outputs auxiliary torque to a steering wheel of a vehicle and is attached to a mounted portion. A power board on which a bridge circuit composed of a plurality of semiconductor switching elements for switching the current of the electric motor according to the assisting torque is mounted; and a heat sink provided in surface contact with the power board. Is divided into two parts: a board-side heat sink part on the power board side, and a attached-part-side heat sink part attached to the attached part.

この発明に係る電動式パワーステアリング制御装置によれば、被取付部の形状変更に対して、既存の製造設備で対応し易くなるとともに、在庫管理も簡単化され、製造コストが低減される。   According to the electric power steering control device according to the present invention, it becomes easy to cope with a change in the shape of the mounted portion with existing manufacturing equipment, and the inventory management is simplified, and the manufacturing cost is reduced.

実施の形態１．
図１は電動式パワーステアリング制御装置（以下、制御装置と略称する）の分解斜視図、図２は図１の制御装置の組み立て途中の図である。
この制御装置は、パワー基板１と、箱形形状のハウジング２と、絶縁プリント基板からなる制御基板３と、パワー基板１と重なったヒートシンク４と、内部にパワー基板１、ハウジング２及び制御基板３等を覆って電磁ノイズを遮断する金属製のケース６とを備えている。 Embodiment 1 FIG.
FIG. 1 is an exploded perspective view of an electric power steering control device (hereinafter abbreviated as a control device), and FIG. 2 is a diagram in the middle of assembly of the control device of FIG.
This control device includes a power board 1, a box-shaped housing 2, a control board 3 made of an insulating printed board, a heat sink 4 overlapping the power board 1, and a power board 1, housing 2 and control board 3 inside. And a metal case 6 that covers electromagnetic field noise and covers electromagnetic noise.

パワー基板１は、熱伝導性に優れたアルミニウム等の金属基板上に絶縁層を介して配線パターンが形成されている。パワー基板１上の配線パターンには、電動モータ（図示せず）の電流を切り替えるためのブリッジ回路を構成する半導体スイッチング素子７、電動モータの電流を検出するためのシャント抵抗器９等の大電流部品が搭載されている。   In the power substrate 1, a wiring pattern is formed on a metal substrate such as aluminum having excellent thermal conductivity via an insulating layer. The wiring pattern on the power substrate 1 includes a large current such as a semiconductor switching element 7 constituting a bridge circuit for switching the current of an electric motor (not shown), a shunt resistor 9 for detecting the current of the electric motor, and the like. Parts are mounted.

制御基板３上の配線パターンには、マイクロコンピュータ、駆動回路及びモータ電流検出回路を含む周辺回路素子（小電流部品）が、半田付けにより実装されている。なお、図面では、マイクロコンピュータ、小電流部品は省略されている。   On the wiring pattern on the control board 3, peripheral circuit elements (small current components) including a microcomputer, a drive circuit, and a motor current detection circuit are mounted by soldering. In the drawing, the microcomputer and the small current component are omitted.

ハウジング２は、側面にパワーコネクタ１０が形成されている。ハウジング２には、パワーコネクタ１０のリード端子、中継導電線がインサートモールド成形により一体化されている。このリード端子は、中継導電線を介してパワー基板１の配線パターンに設けられた電極１２に接続されている。
ハウジング２には、配線パターンが形成されている。この配線パターンには、モータ電流を通電、遮断する電源リレー１３、ブリッジ回路のスイッチング動作時に発生する電磁ノイズを外部に流出するのを防止するコイル１４、電動モータに流れるモータ電流のリップル成分を吸収するための大容量のコンデンサ１５等が接続されている。 The housing 2 has a power connector 10 formed on the side surface. In the housing 2, the lead terminal of the power connector 10 and the relay conductive wire are integrated by insert molding. This lead terminal is connected to the electrode 12 provided in the wiring pattern of the power board 1 through the relay conductive wire.
A wiring pattern is formed in the housing 2. The wiring pattern absorbs the ripple component of the motor current flowing in the electric motor, the power supply relay 13 for energizing and interrupting the motor current, the coil 14 for preventing the electromagnetic noise generated during the switching operation of the bridge circuit from flowing out to the outside. A large-capacitance capacitor 15 or the like is connected.

アルミニウム製のヒートシンク４は、２分割構造であり、平板状でパワー基板１に取り付けられた基板側ヒートシンク部４Ａと、被取付部である車両の形状に対応した形状の車両側ヒートシンク部４Ｂとから構成されている。基板側ヒートシンク部４Ａと、被取付部側ヒートシンク部である車両側ヒートシンク部４Ｂとの間には、両者間の熱抵抗を低減させる熱抵抗低減手段である高熱伝導性樹脂１７が設けられている。この高熱伝導性樹脂１７は、例えば熱伝導性エポキシ樹脂に銅の金属粉末が混入されて構成されている。   The heat sink 4 made of aluminum has a two-part structure, and is composed of a flat plate-like board-side heat sink portion 4A attached to the power board 1 and a vehicle-side heat sink portion 4B having a shape corresponding to the shape of the vehicle as the attached portion. It is configured. Between the board-side heat sink portion 4A and the vehicle-side heat sink portion 4B which is the attached portion-side heat sink portion, a high thermal conductive resin 17 which is a thermal resistance reducing means for reducing the thermal resistance therebetween is provided. . The high thermal conductive resin 17 is configured, for example, by mixing a copper metal powder in a thermal conductive epoxy resin.

次に、上記構成の制御装置の組み立て手順について説明する。
先ず、各電極にクリーム半田を塗布したパワー基板１上に、半導体スイッチング素子７、シャント抵抗器９等の電気部品を載置する。このパワー基板１上に、リード端子セット１６が取り付けられたハウジング２を配置する。その後、周囲の雰囲気全体を熱し、先に塗布したクリーム半田を溶かし、各上記電気部品を半田付けする。これによって、パワー基板１と各電気部品とが電気的に接続され、またパワーコネクタ１０とパワー基板１とが中継導電線、電極１２を介して電気的に接続される。
次に、開口された状態のハウジング２の片側底面からコンデンサ１５、電源リレー１３及びコイル１４をハウジング２の内部に収めた後、中継用導電線と半田により接続する。 Next, a procedure for assembling the control device having the above configuration will be described.
First, electrical components such as the semiconductor switching element 7 and the shunt resistor 9 are placed on the power substrate 1 in which cream solder is applied to each electrode. On the power board 1, the housing 2 to which the lead terminal set 16 is attached is disposed. Thereafter, the entire surrounding atmosphere is heated to melt the previously applied cream solder, and each of the electrical components is soldered. Thereby, the power board 1 and each electric component are electrically connected, and the power connector 10 and the power board 1 are electrically connected via the relay conductive wire and the electrode 12.
Next, after the capacitor 15, the power relay 13 and the coil 14 are housed in the housing 2 from the bottom of one side of the housing 2 in the opened state, they are connected to the relay conductive wire by soldering.

その後、ハウジング２上に、各電極に半田付けによりマイクロコンピュータ、小電流部品が電気的に接続された制御基板３を載置し、半田付けにより制御基板３をハウジング２に接続する。このとき、リード端子セット１６を介して制御基板３とパワー基板１とが電気的に接続される。
その後、ねじ１８により、ハウジング２、パワー基板１及び基板側ヒートシンク部４Ａを螺着し、またねじ２１により、ハウジング２及び基板側ヒートシンク部４Ａを螺着し、さらに、ねじ１９により、ケース６，ハウジング２、パワー基板１及び基板側ヒートシンク部４Ａを螺着することで、図２に示す制御装置本体２０が製造される。 Thereafter, the control board 3 in which a microcomputer and a small current component are electrically connected to each electrode by soldering is placed on the housing 2, and the control board 3 is connected to the housing 2 by soldering. At this time, the control board 3 and the power board 1 are electrically connected via the lead terminal set 16.
Thereafter, the housing 2, the power board 1 and the board-side heat sink 4 </ b> A are screwed together with the screws 18, the housing 2 and the board-side heat sink 4 </ b> A are screwed together with the screws 21, and the case 6 The control device main body 20 shown in FIG. 2 is manufactured by screwing the housing 2, the power substrate 1, and the substrate-side heat sink portion 4 </ b> A.

次に、表面に高熱伝導性樹脂１７が塗布された車両側ヒートシンク部４Ｂをねじ５を用いて基板側ヒートシンク部４Ａに組付けることで制御装置の組み立てが終了する。   Next, the assembly of the control device is completed by assembling the vehicle-side heat sink 4B having the surface coated with the high thermal conductive resin 17 to the board-side heat sink 4A using the screws 5.

その後、この制御装置に電動モータを組み付けることで、電動式パワーステアリング装置の組み立てが完了する。   Thereafter, the assembly of the electric power steering device is completed by assembling the electric motor to the control device.

上記構成の制御装置では、マイクロコンピュータは、トルクセンサ（図示せず）から操舵トルク、回転位置センサ（図示せず）から電動モータの回転子の回転位置と取り込み、また車両側信号を取り込み、シャント抵抗器９からモータ電流を電流検出手段を介してフィードバック入力し、パワーステアリングの回転方向指令、及び補助トルクに相当する電流制御量をそれぞれ生成し、駆動回路に入力する。駆動回路は、回転方向指令及び電流制御量が入力されると、ＰＷＭ駆動信号を生成し、ブリッジ回路の半導体スイッチング素子７に印加する。これにより、バッテリから外部配線、パワーコネクタ１０、コイル１４、ブリッジ回路、電源リレー１３、モータコネクタを介して電動モータに電流が流れ、所要方向に所要量の補助トルクが出力される。   In the control device having the above configuration, the microcomputer captures the steering torque from the torque sensor (not shown), the rotational position of the rotor of the electric motor from the rotational position sensor (not shown), the vehicle side signal, and the shunt. The motor current is fed back from the resistor 9 through the current detection means, and current control amounts corresponding to the rotational direction command of the power steering and the auxiliary torque are generated and input to the drive circuit. When the rotation direction command and the current control amount are input, the drive circuit generates a PWM drive signal and applies it to the semiconductor switching element 7 of the bridge circuit. As a result, a current flows from the battery to the electric motor via the external wiring, power connector 10, coil 14, bridge circuit, power supply relay 13, and motor connector, and a required amount of auxiliary torque is output in the required direction.

このとき、モータ電流は、シャント抵抗器９及びモータ電流検出手段を介して検出され、マイクロコンピュータにフィードバックされることにより、モータ電流指令と一致するよう制御される。また、モータ電流は、ブリッジ回路のＰＷＭ駆動時のスイッチング動作によりリップル成分を含むが、大容量のコンデンサ１５により平滑されて制御される。さらに、コイル１４は、上記ブリッジ回路がＰＷＭ駆動時に、スイッチング動作することにより発生するノイズが外部に放出されて、ラジオノイズとなることを防止する。   At this time, the motor current is detected via the shunt resistor 9 and the motor current detection means, and is fed back to the microcomputer, thereby being controlled to coincide with the motor current command. Further, the motor current includes a ripple component due to the switching operation at the time of PWM driving of the bridge circuit, but is smoothed and controlled by the large-capacitance capacitor 15. Further, the coil 14 prevents the noise generated by the switching operation during the PWM drive of the bridge circuit from being emitted to the outside and becoming radio noise.

以上説明したように、この実施の形態による制御装置によれば、ヒートシンク４は、パワー基板１側の基板側ヒートシンク部４Ａと、被取付部である車両に取り付けられる車両側ヒートシンク部４Ｂとに２分割されているので、車両の形状変更によっては、制御装置本体２０の仕様を変更することなく、車両側ヒートシンク部４Ｂのみの変更で対応することができる。
従って、ヒートシンク４の仕様変更に対して既存の製造設備で対応することが容易となり、また在庫管理が簡単化され、さらに制御装置本体２０の規格を統一化することができるので、製造コストが低減される。 As described above, according to the control device according to this embodiment, the heat sink 4 is divided into two parts: the board-side heat sink part 4A on the power board 1 side and the vehicle-side heat sink part 4B attached to the vehicle that is the attached part. Since it is divided, depending on the change in the shape of the vehicle, it is possible to cope with the change only in the vehicle-side heat sink portion 4B without changing the specifications of the control device main body 20.
Therefore, it becomes easy to cope with the specification change of the heat sink 4 with the existing manufacturing equipment, the inventory management is simplified, and the standard of the control device main body 20 can be unified, thereby reducing the manufacturing cost. Is done.

また、基板側ヒートシンク部４Ａと車両側ヒートシンク部４Ｂとの間に、高熱伝導性樹脂１７が介在しており、基板側ヒートシンク部４Ａと車両側ヒートシンク部４Ｂとは、高熱伝導性樹脂１７を介して密着し、両者間の熱抵抗が低減され、制御装置本体２０の放熱性が向上する。
なお、高熱伝導性樹脂としては、高熱伝導性のエンジニアリングプラスチックであってもよい。 Further, a high thermal conductive resin 17 is interposed between the board-side heat sink portion 4A and the vehicle-side heat sink portion 4B, and the substrate-side heat sink portion 4A and the vehicle-side heat sink portion 4B are interposed via the high thermal conductive resin 17. The heat resistance between the two is reduced, and the heat dissipation of the control device main body 20 is improved.
The high thermal conductive resin may be a high thermal conductive engineering plastic.

また、熱抵抗低減手段として、例えば弾性を有する銅からなる高熱伝導性平板であってもよい。ヒートシンク４がアルミニウム製であるときに、アルミニウムよりも熱伝導率が高い銅からなる平板を用いたときには特に効果が大である。
また、高熱伝導性平板として、Ａｌ２Ｏ３、Ｓｉ３Ｎ４、ＡｌＮ等からなるセラミックであってもよい。 Moreover, as a thermal resistance reduction means, the high heat conductive flat plate which consists of copper which has elasticity, for example may be sufficient. When the heat sink 4 is made of aluminum, the effect is particularly great when a flat plate made of copper having a higher thermal conductivity than aluminum is used.
Moreover, the ceramic which consists of Al2O3, Si3N4, AlN etc. may be sufficient as a highly heat conductive flat plate.

この発明の実施の形態１における電動式パワーステアリング制御装置の分解斜視図である。解斜視図である。1 is an exploded perspective view of an electric power steering control device according to Embodiment 1 of the present invention. FIG. 図１の電動式パワーステアリング制御装置の製造途中の斜視図である。It is a perspective view in the middle of manufacture of the electric power steering control device of FIG.

符号の説明Explanation of symbols

１ パワー基板、２ ハウジング、３ 制御基板、４ ヒートシンク、４Ａ 基板側ヒートシンク部、４Ｂ 車両側ヒートシンク部（被取付部側ヒートシンク部）、７ 半導体スイッチング素子、１７ 高熱伝導性樹脂（熱抵抗低減手段）、２０ 制御装置本体。   DESCRIPTION OF SYMBOLS 1 Power board, 2 Housing, 3 Control board, 4 Heat sink, 4A Substrate side heat sink part, 4B Vehicle side heat sink part (attachment part side heat sink part), 7 Semiconductor switching element, 17 High thermal conductive resin (thermal resistance reduction means) 20 Control device body.

Claims (4)

車両のハンドルに補助トルクを出力する電動モータの駆動を制御し、被取付部に取り付けられる電動式パワーステアリング制御装置であって、
前記ハンドルに対して補助するトルクに応じて前記電動モータの電流を切り換えるための複数の半導体スイッチング素子からなるブリッジ回路が搭載されたパワー基板と、
このパワー基板に面接触して設けられたヒートシンクとを備え、
前記ヒートシンクは、パワー基板側の基板側ヒートシンク部と、前記被取付部に取り付けられる被取付部側ヒートシンク部とに２分割されていることを特徴とする電動式パワーステアリング制御装置。 An electric power steering control device that controls driving of an electric motor that outputs auxiliary torque to a steering wheel of a vehicle and is attached to a mounted portion,
A power board on which a bridge circuit composed of a plurality of semiconductor switching elements for switching the current of the electric motor according to torque assisting the handle is mounted;
A heat sink provided in surface contact with the power board,
2. The electric power steering control device according to claim 1, wherein the heat sink is divided into a board-side heat sink part on the power board side and a mounted part-side heat sink part attached to the mounted part. 前記基板側ヒートシンク部と前記被取付部側ヒートシンク部との間に、基板側ヒートシンク部と被取付部側ヒートシンク部との間の熱抵抗を低減させる熱抵抗低減手段が設けられている請求項１に記載の電動式パワーステアリング制御装置。   2. A thermal resistance reducing means for reducing a thermal resistance between the substrate side heat sink portion and the attached portion side heat sink portion is provided between the substrate side heat sink portion and the attached portion side heat sink portion. The electric power steering control device described in 1. 前記熱抵抗低減手段は、金属粉末が混入された高熱伝導性樹脂である請求項２に記載の電動式パワーステアリング制御装置。   The electric power steering control device according to claim 2, wherein the thermal resistance reducing means is a high thermal conductive resin mixed with metal powder. 前記熱抵抗低減手段は、弾性を有する高熱伝導性平板である請求項２に記載の電動式パワーステアリング制御装置。   The electric power steering control device according to claim 2, wherein the thermal resistance reducing means is a highly heat conductive flat plate having elasticity.
JP2005110048A 2005-04-06 2005-04-06 Electric power steering control device Expired - Fee Related JP4203035B2 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008290616A (en) * 2007-05-25 2008-12-04 Nsk Ltd Electric power steering device
JP2009189111A (en) * 2008-02-05 2009-08-20 Panasonic Corp Motor driving device
KR100922057B1 (en) * 2007-05-07 2009-10-16 미쓰비시덴키 가부시키가이샤 Electronic control apparatus

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100922057B1 (en) * 2007-05-07 2009-10-16 미쓰비시덴키 가부시키가이샤 Electronic control apparatus
US7643297B2 (en) 2007-05-07 2010-01-05 Mitsubishi Electric Corporation Electronic control apparatus
JP2008290616A (en) * 2007-05-25 2008-12-04 Nsk Ltd Electric power steering device
JP2009189111A (en) * 2008-02-05 2009-08-20 Panasonic Corp Motor driving device

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