JP5200500B2 - Power control device for electric power steering device - Google Patents

Power control device for electric power steering device Download PDF

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JP5200500B2
JP5200500B2 JP2007298867A JP2007298867A JP5200500B2 JP 5200500 B2 JP5200500 B2 JP 5200500B2 JP 2007298867 A JP2007298867 A JP 2007298867A JP 2007298867 A JP2007298867 A JP 2007298867A JP 5200500 B2 JP5200500 B2 JP 5200500B2
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JP2009124914A (en
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茂樹 長瀬
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JTEKT Corp
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Description

本発明は、電気二重層コンデンサからなる電源の制御装置、及び、電動パワーステアリング装置の電源制御装置に関する。   The present invention relates to a power supply control device including an electric double layer capacitor and a power supply control device for an electric power steering device.

例えば、自動車等の車両に搭載される電動パワーステアリング装置は、必要とされる操舵補助力が大きいほど、モータに大電流を流す必要があるので、車載バッテリだけでは電力が不足することがある。そこで、通常は主電源である車載バッテリからモータに電力を供給するが、据切り時や急操舵時等、必要とされる操舵補助力が大きい場合には、予め電力を貯えていた補助電源からも電力を供給し、車載バッテリの電力不足を補うようにした技術が提案されている（例えば、特許文献１参照）。この特許文献１では、補助電源として例えば電気二重層コンデンサ（キャパシタ）が用いられている。
特開２００３−３２０９４２号公報 For example, an electric power steering device mounted on a vehicle such as an automobile needs to pass a larger current through the motor as the required steering assist force is larger. Therefore, power is usually supplied to the motor from the in-vehicle battery, which is the main power source. However, if the required steering assist force is large, such as during stationary operation or sudden steering, the auxiliary power source that has previously stored the power Has also been proposed in which power is supplied to compensate for the shortage of electric power in the in-vehicle battery (see, for example, Patent Document 1). In Patent Document 1, for example, an electric double layer capacitor (capacitor) is used as an auxiliary power source.
JP 2003-320942 A

図５は電気二重層コンデンサの温度と静電容量との関係を示すグラフである。図５にハッチングを付して示すように、電気二重層コンデンサは約−２０℃よりも温度が低くなると静電容量が低下するとともに内部抵抗が大きくなり、効率が大幅に低下するという問題がある。寒冷地では、自動車の始動直後等にこのような低温状態で電気二重層コンデンサが使用されることがあり、この場合モータに十分な電力を供給することが困難となる。
このような問題を解消するために、低温状態にある電気二重層コンデンサをヒータで暖めることも考えられるが、ヒータを備えることによってコストが増大し、ヒータを作動させるための電力が新たに必要になる。 FIG. 5 is a graph showing the relationship between the temperature and capacitance of the electric double layer capacitor. As shown in FIG. 5 with hatching, the electric double layer capacitor has a problem that when the temperature is lower than about −20 ° C., the capacitance is lowered and the internal resistance is increased and the efficiency is greatly lowered. . In a cold region, the electric double layer capacitor may be used at such a low temperature immediately after starting the automobile, and in this case, it becomes difficult to supply sufficient electric power to the motor.
In order to solve such problems, it is conceivable to heat the electric double layer capacitor in a low temperature state with a heater. Become.

本発明は、ヒータを用いることなく電気二重層コンデンサからなる電源を昇温して効率の低下を防止する電動パワーステアリング装置の電源制御装置を提供することを目的とする。 The present invention aims to provide a power supply control apparatus for an electric double layer to increase the temperature of the power composed of a capacitor and efficiency to that electric power steering device prevents a decrease in without using a heater.

本発明の電動パワーステアリング装置の電源制御装置は、
電動パワーステアリング装置のモータに電力を供給する主電源と、
前記モータに電力を供給可能な電気二重層コンデンサからなる補助電源と、
前記補助電源の温度を測定する温度測定手段と、
前記補助電源の温度が所定の閾値以下となったときに、当該補助電源を繰り返し充放電させることにより当該補助電源の昇温制御を行う制御回路と、
前記昇温制御を行う場合に、前記補助電源の放電電流によって前記モータを駆動させることなく当該補助電源を強制的に放電させる強制放電手段と、
を備えていることを特徴とする。 The power control device of the electric power steering device of the present invention is
A main power source for supplying electric power to the motor of the electric power steering device;
An auxiliary power source comprising an electric double layer capacitor capable of supplying electric power to the motor;
Temperature measuring means for measuring the temperature of the auxiliary power source;
A control circuit for performing temperature increase control of the auxiliary power source by repeatedly charging and discharging the auxiliary power source when the temperature of the auxiliary power source becomes a predetermined threshold value or less;
When performing the temperature rise control, forced discharge means for forcibly discharging the auxiliary power without driving the motor by the discharge current of the auxiliary power,
It is characterized by having.

以上の構成によれば、電気二重層コンデンサからなる補助電源の温度を測定手段によって測定し、当該温度が所定の閾値以下となったときは、当該補助電源からモータへの電力供給の要否に関わらず、当該補助電源を繰り返し充放電させる。この充放電により補助電源に電流が流れると、当該補助電源は内部抵抗によって自己発熱し、昇温する。これにより、当該補助電源の温度を閾値以上にして効率低下を防止することができる。そのため、当該補助電源をヒータ等によって外部から昇温させる必要がなくなり、コスト増を抑制することができる。 According to the above configuration, the temperature of the auxiliary power ing from the electric double layer capacitor was measured by the measuring means, when said temperature is equal to or less than a predetermined threshold, power to the auxiliary power source or et motor Regardless of the necessity of supply, the auxiliary power supply is repeatedly charged and discharged. When the current to the auxiliary power source by the charging and discharging flow, the auxiliary power source is self-heated by the internal resistance, the temperature is raised. As a result, the temperature of the auxiliary power source can be set to a threshold value or more to prevent efficiency reduction. Therefore, it is not necessary to raise the temperature of the auxiliary power source from the outside with a heater or the like, and an increase in cost can be suppressed.

本発明によれば、電気二重層コンデンサからなる電源が低温状態になっても、ヒータ等を用いることなく昇温することができ、低コストで効率の低下を防止することができる。   According to the present invention, even when a power source composed of an electric double layer capacitor is in a low temperature state, the temperature can be raised without using a heater or the like, and a reduction in efficiency can be prevented at a low cost.

図１は、本発明の第１の実施の形態に係る電動パワーステアリング装置１のモータ制御装置（電源制御装置）１０を示すブロック回路図である。図１において、車両のステアリング装置２は、ステアリングホイール（操舵部材）３に加わるドライバーの操舵動作に応じて、図示しないタイヤ（操向車輪）の向きを変えるための操舵軸２ａを備えている。そして、電動パワーステアリング装置１は、必要に応じてブラシレスモータ等のモータ４の動力（操舵補助力）を操舵軸２ａに付与することによってドライバーによる操舵負担を軽減するものとなっている。   FIG. 1 is a block circuit diagram showing a motor control device (power supply control device) 10 of the electric power steering apparatus 1 according to the first embodiment of the present invention. In FIG. 1, a vehicle steering device 2 includes a steering shaft 2 a for changing the direction of a tire (steering wheel) (not shown) in accordance with a steering operation of a driver applied to a steering wheel (steering member) 3. The electric power steering device 1 reduces the steering burden on the driver by applying the power (steering assisting force) of the motor 4 such as a brushless motor to the steering shaft 2a as necessary.

モータ制御装置１０は、主電源１１、補助電源１２、充電回路１３、放電回路１４、リレー回路１５、モータ駆動回路５等を備えている。主電源１１は、車載バッテリ及びオルタネータによって構成されている。車載バッテリ及びオルタネータは、電動パワーステアリング装置１を含む車両の各種電気機器に電力を供給し、車載バッテリはオルタネータにより充電される。主電源１１は、給電電路１６を介してモータ駆動回路５に接続されている。   The motor control device 10 includes a main power supply 11, an auxiliary power supply 12, a charging circuit 13, a discharging circuit 14, a relay circuit 15, a motor driving circuit 5, and the like. The main power supply 11 is composed of an in-vehicle battery and an alternator. The in-vehicle battery and the alternator supply electric power to various electric devices of the vehicle including the electric power steering device 1, and the in-vehicle battery is charged by the alternator. The main power supply 11 is connected to the motor drive circuit 5 via a power feeding circuit 16.

補助電源１２は、電気二重層コンデンサによって構成され、主電源１１によって充電されると共に、必要に応じて電動パワーステアリング装置１のモータ４に電力を供給する。補助電源１２の一方の端子１２ａは、給電電路１６に接続された充電電路１８と、放電電路１９とに接続されている。補助電源１２の他方の端子１２ｂは、第１切換スイッチ２０を介して給電電路１６又は接地電位に接続されている。充電電路１８には逆流防止用のダイオード２１が設けられ、このダイオード２１と第１切換スイッチ２０によって充電回路１３が構成されている。   The auxiliary power source 12 is constituted by an electric double layer capacitor, is charged by the main power source 11, and supplies power to the motor 4 of the electric power steering apparatus 1 as necessary. One terminal 12 a of the auxiliary power source 12 is connected to a charging electric circuit 18 connected to the power supply electric circuit 16 and a discharging electric circuit 19. The other terminal 12 b of the auxiliary power supply 12 is connected to the power feeding circuit 16 or the ground potential via the first changeover switch 20. The charging circuit 18 is provided with a diode 21 for preventing backflow, and the diode 21 and the first changeover switch 20 constitute a charging circuit 13.

放電電路１９は、第２切換スイッチ２２を介してモータ駆動回路５に接続されている。第２切換スイッチ２２は、モータ駆動回路５を給電電路１６と放電電路１９とに切り換えて接続する。この第２切換スイッチ２２によって放電回路１４が構成されている。リレー回路１５は、制御回路２４等に異常が発生した場合に主電源１１の電流がモータ４へ流れないように給電電路１６を遮断する。   The discharge electric path 19 is connected to the motor drive circuit 5 via the second changeover switch 22. The second changeover switch 22 switches the motor drive circuit 5 between the power feeding circuit 16 and the discharge circuit 19 and connects them. The discharge circuit 14 is configured by the second changeover switch 22. The relay circuit 15 interrupts the power feeding circuit 16 so that the current of the main power supply 11 does not flow to the motor 4 when an abnormality occurs in the control circuit 24 or the like.

モータ駆動回路５、充電回路１３、放電回路１４、及びリレー回路１５は、制御回路２４の制御信号を受けて動作する。この制御回路２４には、運転者によるステアリングホイール３の操舵トルクを検出するトルクセンサ２５や、車速センサ２６からの検出結果が入力されるようになっており、制御回路２４はこれらの検出結果に応じて適切な操舵補助力を発生させるべく、モータ４を駆動させる。   The motor drive circuit 5, the charging circuit 13, the discharging circuit 14, and the relay circuit 15 operate in response to a control signal from the control circuit 24. Detection results from a torque sensor 25 for detecting the steering torque of the steering wheel 3 by the driver and a vehicle speed sensor 26 are input to the control circuit 24, and the control circuit 24 receives these detection results. Accordingly, the motor 4 is driven to generate an appropriate steering assist force.

充電回路１３を構成する第１切換スイッチ２０が実線で示すａ位置に切り換えられると、補助電源１２の他方の端子１２ｂが接地電位に接続される。この状態で、放電回路１４を構成する第２切換スイッチ２２が実線で示すｃ位置に切り換えられると、給電電路１６がモータ駆動回路５に接続される。これにより、主電源１１の電力が給電電路１６を介してモータ駆動回路５に供給され、補助電源１２が充電電路１８を介して主電源１１によって充電される。したがって、補助電源１２の電力はモータ駆動回路５には供給されない。   When the first changeover switch 20 constituting the charging circuit 13 is switched to the position a shown by the solid line, the other terminal 12b of the auxiliary power supply 12 is connected to the ground potential. In this state, when the second changeover switch 22 constituting the discharge circuit 14 is switched to the position c indicated by the solid line, the power feeding circuit 16 is connected to the motor drive circuit 5. As a result, the electric power of the main power supply 11 is supplied to the motor drive circuit 5 through the power supply circuit 16, and the auxiliary power supply 12 is charged by the main power supply 11 through the charging electric circuit 18. Therefore, the power of the auxiliary power source 12 is not supplied to the motor drive circuit 5.

一方、第１切換スイッチ２０が点線で示すｂ位置に切り換えられると、補助電源１２の他方の端子１２ｂが主電源１１に直列に接続される。この状態で、第２切換スイッチ２２が点線で示すｄ位置に切り換えられると、放電電路１９がモータ駆動回路５に接続され、主電源１１及び補助電源１２の電力がモータ駆動回路５に供給される。   On the other hand, when the first changeover switch 20 is switched to the position b indicated by the dotted line, the other terminal 12b of the auxiliary power supply 12 is connected to the main power supply 11 in series. In this state, when the second changeover switch 22 is switched to the position d indicated by the dotted line, the discharge circuit 19 is connected to the motor drive circuit 5 and the electric power of the main power supply 11 and the auxiliary power supply 12 is supplied to the motor drive circuit 5. .

つまり、第１，第２切換スイッチ２０，２２を実線で示す位置ａ，ｃに切り換えると補助電源１２が充電状態になり、第１，第２切換スイッチ２０，２２を点線で示す位置ｂ，ｄに切り換えると補助電源１２が放電状態になる。   That is, when the first and second change-over switches 20 and 22 are switched to the positions a and c indicated by solid lines, the auxiliary power supply 12 is charged, and the first and second change-over switches 20 and 22 are indicated by positions b and d indicated by dotted lines. When switched to, the auxiliary power supply 12 is discharged.

上記の構成において、必要とされる操舵補助力が比較的小さいときは、制御回路２４は第１，第２切換スイッチ２０，２２をそれぞれ位置ａ，ｃに切り換えて補助電源１２を充電状態にする。これにより、主電源１１の電力がモータ駆動回路５に供給され、モータ駆動回路５が制御回路２４による制御信号に基づいてモータ４を駆動する。   In the above configuration, when the required steering assist force is relatively small, the control circuit 24 switches the first and second changeover switches 20 and 22 to the positions a and c, respectively, to bring the auxiliary power source 12 into a charged state. . Thereby, the electric power of the main power supply 11 is supplied to the motor drive circuit 5, and the motor drive circuit 5 drives the motor 4 based on the control signal from the control circuit 24.

一方、必要とされる操舵補助力が比較的大きく、主電源１１のみではまかないきれないときは、制御回路２４は、第１，第２切換スイッチ２０，２２をそれぞれ位置ｂ，ｄに切り換えて補助電源１２を放電状態にする。これにより、主電源１１と補助電源１２とが互いに直列に接続された状態で、両者の電力がモータ駆動回路５に供給される。   On the other hand, when the required steering assist force is relatively large and cannot be covered by the main power supply 11 alone, the control circuit 24 switches the first and second changeover switches 20 and 22 to the positions b and d, respectively. The power supply 12 is discharged. Thereby, the electric power of both is supplied to the motor drive circuit 5 in a state where the main power supply 11 and the auxiliary power supply 12 are connected in series.

本実施の形態のモータ制御装置１０の制御回路２４は、必要とされる操舵補助力に応じて主電源１１及び補助電源１２の電力をモータ４に供給するための上述の制御（通常制御）を行うだけでなく、補助電源１２が低温状態にある場合に当該補助電源１２を昇温させるための昇温制御をも行うようになっている。   The control circuit 24 of the motor control device 10 of the present embodiment performs the above-described control (normal control) for supplying the power of the main power supply 11 and the auxiliary power supply 12 to the motor 4 according to the required steering assist force. In addition to this, when the auxiliary power source 12 is in a low temperature state, temperature increase control for increasing the temperature of the auxiliary power source 12 is also performed.

電気二重層コンデンサからなる補助電源１２は、低温になるとその静電容量が低下し、内部抵抗が大きくなることが知られている。そのため、補助電源１２が低温状態にあり且つ必要とされる操舵補助力が大きくなった場合には、補助電源１２からモータ４へ十分な電力を供給できなくなる可能性が高くなる。そこで、本実施形態では、補助電源１２の温度を監視すると共に当該温度が所定の閾値よりも低下したときに補助電源１２を昇温させるための昇温制御を行う。以下、その詳細について説明する。   It is known that the auxiliary power source 12 composed of an electric double layer capacitor has a lower capacitance and a higher internal resistance when the temperature is lowered. Therefore, when the auxiliary power source 12 is in a low temperature state and the required steering assist force increases, there is a high possibility that sufficient power cannot be supplied from the auxiliary power source 12 to the motor 4. Therefore, in this embodiment, the temperature of the auxiliary power supply 12 is monitored, and temperature increase control is performed to raise the temperature of the auxiliary power supply 12 when the temperature falls below a predetermined threshold. The details will be described below.

補助電源１２にはサーモセンサ（温度測定手段）２７が取り付けられており、このサーモセンサ２７によって補助電源１２の温度が常時測定され、その測定結果が制御回路２４に入力される。制御回路２４は、入力された測定結果に基づき充電回路１３及び放電回路１４を制御する。具体的には、サーモセンサ２７によって測定された補助電源１２の温度が所定の閾値以下のとき、制御回路２４は、補助電源１２の充電と放電とを繰り返し行うように第１，第２切換スイッチ２０，２２を制御する。   A thermosensor (temperature measuring means) 27 is attached to the auxiliary power supply 12, and the temperature of the auxiliary power supply 12 is constantly measured by the thermosensor 27, and the measurement result is input to the control circuit 24. The control circuit 24 controls the charging circuit 13 and the discharging circuit 14 based on the input measurement result. Specifically, when the temperature of the auxiliary power supply 12 measured by the thermosensor 27 is equal to or lower than a predetermined threshold, the control circuit 24 first and second changeover switches so as to repeatedly charge and discharge the auxiliary power supply 12. 20 and 22 are controlled.

前記閾値は、補助電源１２である電気二重層コンデンサの温度が当該閾値以下となると、静電容量が低下するとともに内部抵抗の増大し、効率が低下してしまうような値として設定される。例えば、補助電源１２が図５に示す特性を示す場合、閾値を−２０℃に設定する。補助電源１２の温度が閾値である−２０℃を超えていれば、補助電源１２が本来備えている性能を発揮できる。一方、補助電源１２の温度が−２０℃以下となると、静電容量の低下によりモータに十分な電力を供給できなくなる。   The threshold value is set as a value such that when the temperature of the electric double layer capacitor serving as the auxiliary power source 12 is equal to or lower than the threshold value, the capacitance decreases, the internal resistance increases, and the efficiency decreases. For example, when the auxiliary power supply 12 exhibits the characteristics shown in FIG. 5, the threshold value is set to −20 ° C. If the temperature of the auxiliary power supply 12 exceeds the threshold value of −20 ° C., the performance of the auxiliary power supply 12 can be exhibited. On the other hand, when the temperature of the auxiliary power supply 12 is −20 ° C. or lower, sufficient electric power cannot be supplied to the motor due to a decrease in capacitance.

このような低温状態で補助電源１２の充放電を繰り返し行うと、補助電源１２には頻繁に電流が流れ、内部抵抗により自己発熱する。そのため、外部から補助電源１２を暖めなくても補助電源１２の温度を所定の閾値以上に上昇させることができ、補助電源１２の効率低下を防止することが可能となる。   If the auxiliary power supply 12 is repeatedly charged and discharged in such a low temperature state, a current frequently flows through the auxiliary power supply 12 and self-heats due to internal resistance. Therefore, the temperature of the auxiliary power supply 12 can be raised to a predetermined threshold or higher without heating the auxiliary power supply 12 from the outside, and the efficiency of the auxiliary power supply 12 can be prevented from decreasing.

図２は、制御回路２４による補助電源１２の昇温制御の手順を示すフローチャートである。
自動車のエンジンを始動するとモータ制御装置１０が起動し、制御回路２４は、主電源１１によって補助電源１２を充電するように第１，第２切換スイッチ２０，２２を切り換える（ステップＳ１）。一方、補助電源１２の温度はサーモセンサ２７により測定され、その測定結果は、制御回路２４に入力されるとともに所定の閾値と比較される（ステップＳ２）。補助電源１２の温度が閾値よりも高い場合（Ｎｏ）、制御回路２４は通常制御を行い、必要とされる操舵補助力に応じて補助電源１２を充放電させる。 FIG. 2 is a flowchart showing a procedure for controlling the temperature increase of the auxiliary power supply 12 by the control circuit 24.
When the automobile engine is started, the motor control device 10 is activated, and the control circuit 24 switches the first and second changeover switches 20 and 22 so as to charge the auxiliary power supply 12 by the main power supply 11 (step S1). On the other hand, the temperature of the auxiliary power supply 12 is measured by the thermosensor 27, and the measurement result is input to the control circuit 24 and compared with a predetermined threshold value (step S2). When the temperature of the auxiliary power source 12 is higher than the threshold (No), the control circuit 24 performs normal control, and charges and discharges the auxiliary power source 12 according to the required steering assist force.

一方、補助電源１２の温度が所定の閾値以下の場合（Ｙｅｓ）、制御回路２４は補助電源１２の放電を行うように第１，第２切換スイッチ２０，２２を切り換える（ステップＳ３）。そして、所定時間経過後又は所定の放電量に達した後、ステップＳ１に戻り、再度補助電源１２の充電を行うように第１，第２切換スイッチ２０，２２を切り換える。その後、制御回路２４は、補助電源１２の温度を所定の閾値と再度比較し（ステップＳ２）、充放電によって補助電源１２の温度が所定の閾値よりも高くなった場合（Ｎｏ）には通常制御を行い、依然として閾値以下の場合（Ｎｏ）は補助電源１２の充放電動作を繰り返し行う。   On the other hand, when the temperature of the auxiliary power supply 12 is equal to or lower than the predetermined threshold (Yes), the control circuit 24 switches the first and second changeover switches 20 and 22 to discharge the auxiliary power supply 12 (step S3). Then, after a predetermined time has elapsed or a predetermined discharge amount has been reached, the process returns to step S1, and the first and second changeover switches 20 and 22 are switched so as to charge the auxiliary power source 12 again. Thereafter, the control circuit 24 compares the temperature of the auxiliary power source 12 with a predetermined threshold value again (step S2). When the temperature of the auxiliary power source 12 becomes higher than the predetermined threshold value due to charging / discharging (No), normal control is performed. If it is still below the threshold (No), the charging / discharging operation of the auxiliary power source 12 is repeated.

なお、補助電源１２の昇温制御を行う場合において、補助電源１２を放電させるとその電流はモータ駆動回路５に流れるが、その際、モータ４が駆動されてしまうと不必要な操舵補助力がステアリング装置２に加わり、好ましくない。そのため、本実施の形態では、モータ４を駆動させることなく補助電源１２を強制的に放電させる強制放電手段を備えている。この強制放電手段は、制御回路２４によってモータ４を駆動する形態とは異なる形態でモータ駆動回路５内のスイッチングを行い、モータ４を駆動しない状態で放電電流（ｄ軸電流）がモータ駆動回路５内の抵抗を通って接地電位に流れるようにモータ駆動回路５を制御することで実現される。また、このような制御に代えて、モータ駆動回路５へ電流が流れる経路とは別の経路に昇温制御用の抵抗を別途設けておき、昇温制御の際に補助電源１２をその抵抗に接続して放電させる構成を採用することも可能である。   In the case where the temperature rise control of the auxiliary power supply 12 is performed, when the auxiliary power supply 12 is discharged, the current flows to the motor drive circuit 5. However, if the motor 4 is driven at that time, unnecessary steering assist force is generated. In addition to the steering device 2, it is not preferable. For this reason, in the present embodiment, a forced discharge means for forcibly discharging the auxiliary power supply 12 without driving the motor 4 is provided. The forced discharge means performs switching in the motor drive circuit 5 in a form different from the form in which the motor 4 is driven by the control circuit 24, and the discharge current (d-axis current) is changed to the motor drive circuit 5 without driving the motor 4. This is realized by controlling the motor drive circuit 5 so as to flow to the ground potential through the internal resistor. Further, instead of such control, a resistance for temperature rise control is separately provided in a path different from the path through which current flows to the motor drive circuit 5, and the auxiliary power source 12 is used as the resistance during temperature rise control. It is also possible to adopt a configuration that connects and discharges.

図３は、本発明の第２の実施の形態に係る電動パワーステアリング装置１のモータ制御装置１０の回路図である。本実施形態では、第１の実施の形態における充電回路１３に昇圧回路が備わっており、昇圧された主電源１１の電圧により補助電源１２が充電されるようになっている。その他の構成は第１の実施の形態と同様であるため詳細な説明は省略する。   FIG. 3 is a circuit diagram of the motor control device 10 of the electric power steering device 1 according to the second embodiment of the present invention. In the present embodiment, the charging circuit 13 in the first embodiment is provided with a booster circuit, and the auxiliary power supply 12 is charged by the boosted voltage of the main power supply 11. Since other configurations are the same as those of the first embodiment, detailed description thereof is omitted.

図４は、本発明の第３の実施の形態に係る電動パワーステアリング装置１のモータ制御装置１０の回路図である。本実施の形態では、補助電源１２が充放電回路３０を介して主電源１１に並列に接続されたものである。本実施の形態においても、補助電源１２の温度測定結果が制御回路２４に入力され、制御回路２４は、温度測定結果に応じて充放電回路１４を制御し、補助電源１２を充放電させる。   FIG. 4 is a circuit diagram of the motor control device 10 of the electric power steering device 1 according to the third embodiment of the present invention. In the present embodiment, the auxiliary power supply 12 is connected in parallel to the main power supply 11 via the charge / discharge circuit 30. Also in the present embodiment, the temperature measurement result of the auxiliary power supply 12 is input to the control circuit 24, and the control circuit 24 controls the charge / discharge circuit 14 according to the temperature measurement result to charge / discharge the auxiliary power supply 12.

本発明は、上述した実施の形態に限定されることなく適宜設計変更可能である。
例えば、充電回路１３及び放電回路１４を構成する第１，第２切換スイッチ２０，２２としては、ＭＯＳ−ＦＥＴ、ＢＪＴ、ＩＧＢＴ等の半導体スイッチング素子を用いることができる。
図２に示す昇温制御の手順では、補助電源１２の温度が所定の閾値以下の場合は、通常制御に移行せず、昇温制御を優先的に行うようになっている。しかし、昇温制御中、補助電源１２の電力をモータに供給する必要が生じた場合には、強制的に昇温制御から通常制御に移行するように構成することも可能である。
本発明は、電動パワーステアリング装置１の電源制御装置だけではなく、電気二重層コンデンサからなる電源を使用する各種の電気機器、特に低温状態で使用され得る電気機器に好適に採用することができる。 The present invention is not limited to the above-described embodiment, and can be appropriately changed in design.
For example, as the first and second changeover switches 20 and 22 constituting the charging circuit 13 and the discharging circuit 14, semiconductor switching elements such as MOS-FET, BJT, and IGBT can be used.
In the temperature increase control procedure shown in FIG. 2, when the temperature of the auxiliary power supply 12 is equal to or lower than a predetermined threshold, the temperature increase control is preferentially performed without shifting to the normal control. However, when it is necessary to supply the electric power of the auxiliary power supply 12 to the motor during the temperature increase control, it is possible to forcibly shift from the temperature increase control to the normal control.
The present invention can be suitably applied not only to the power supply control device of the electric power steering apparatus 1 but also to various electric devices that use a power source composed of an electric double layer capacitor, particularly electric devices that can be used in a low temperature state.

本発明の第１の実施形態に係る電動パワーステアリング装置のモータ制御装置（電源制御装置）のブロック回路図である。1 is a block circuit diagram of a motor control device (power supply control device) of an electric power steering device according to a first embodiment of the present invention. 補助電源の昇温制御の手順を示すフローチャートである。It is a flowchart which shows the procedure of the temperature rising control of an auxiliary power supply. 本発明の第２の実施形態に係る電動パワーステアリング装置のモータ制御装置（電源制御装置）のブロック回路図である。It is a block circuit diagram of the motor control apparatus (power supply control apparatus) of the electric power steering apparatus which concerns on the 2nd Embodiment of this invention. 本発明の第３の実施形態に係る電動パワーステアリング装置のモータ制御装置（電源制御装置）のブロック回路図である。It is a block circuit diagram of the motor control apparatus (power supply control apparatus) of the electric power steering apparatus which concerns on the 3rd Embodiment of this invention. 電気二重層コンデンサの温度と静電容量との関係を示すグラフである。It is a graph which shows the relationship between the temperature of an electric double layer capacitor, and an electrostatic capacitance.

符号の説明Explanation of symbols

１ 電動パワーステアリング装置
４ モータ
１０ モータ制御装置（電源制御装置）
１１ 主電源
１２ 補助電源
２４ 制御回路
２７ サーモセンサ（温度測定手段） DESCRIPTION OF SYMBOLS 1 Electric power steering apparatus 4 Motor 10 Motor control apparatus (power supply control apparatus)
11 Main power supply 12 Auxiliary power supply 24 Control circuit 27 Thermo sensor (temperature measuring means)

Claims (1)

電動パワーステアリング装置のモータに電力を供給する主電源と、
前記モータに電力を供給可能な電気二重層コンデンサからなる補助電源と、
前記補助電源の温度を測定する温度測定手段と、
前記補助電源の温度が所定の閾値以下となったときに、当該補助電源を繰り返し充放電させることにより当該補助電源の昇温制御を行う制御回路と、
前記昇温制御を行う場合に、前記補助電源の放電電流によって前記モータを駆動させることなく当該補助電源を強制的に放電させる強制放電手段と、
を備えていることを特徴とする電動パワーステアリング装置の電源制御装置。 A main power source for supplying electric power to the motor of the electric power steering device;
An auxiliary power source comprising an electric double layer capacitor capable of supplying electric power to the motor ;
Temperature measuring means for measuring the temperature of the auxiliary power source;
A control circuit for performing temperature increase control of the auxiliary power source by repeatedly charging and discharging the auxiliary power source when the temperature of the auxiliary power source becomes a predetermined threshold value or less;
When performing the temperature rise control, forced discharge means for forcibly discharging the auxiliary power without driving the motor by the discharge current of the auxiliary power,
A power supply control device for an electric power steering device.
JP2007298867A 2007-11-19 2007-11-19 Power control device for electric power steering device Active JP5200500B2 (en)

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