WO2015083215A1 - 電動パワーステアリング制御装置 - Google Patents
電動パワーステアリング制御装置 Download PDFInfo
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- WO2015083215A1 WO2015083215A1 PCT/JP2013/082363 JP2013082363W WO2015083215A1 WO 2015083215 A1 WO2015083215 A1 WO 2015083215A1 JP 2013082363 W JP2013082363 W JP 2013082363W WO 2015083215 A1 WO2015083215 A1 WO 2015083215A1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D6/00—Arrangements for automatically controlling steering depending on driving conditions sensed and responded to, e.g. control circuits
- B62D6/02—Arrangements for automatically controlling steering depending on driving conditions sensed and responded to, e.g. control circuits responsive only to vehicle speed
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/04—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
- B62D5/0457—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear characterised by control features of the drive means as such
- B62D5/046—Controlling the motor
- B62D5/0463—Controlling the motor calculating assisting torque from the motor based on driver input
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/04—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
- B62D5/0457—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear characterised by control features of the drive means as such
- B62D5/046—Controlling the motor
- B62D5/0472—Controlling the motor for damping vibrations
Definitions
- the present invention relates to an electric power steering control device that assists the steering force of an automobile driver, and more particularly to an electric power steering control device that can improve noise and vibration suppression while ensuring responsiveness in a low speed range. is there.
- a target current for driving a motor for performing steering assist is set in response to a steering operation of a driver, and a difference between the target current and an actual motor current is reduced.
- a feedback control method was adopted.
- proportional / integral control means (PI control) using a proportional term (P term) and an integral term (I term) based on the difference between the target current and the actual motor current is generally employed. ing.
- the integral term gain is originally set to be smaller than the proportional term gain, so that even if the smaller gain is changed to some extent, there is no significant effect at the actual vehicle level.
- the proportional term can further improve the response by making the gain variable.
- An object of the present invention is to make the gain of the proportional term (P term) variable and to set the gain of the integral term (I term) to a predetermined constant value, while ensuring responsiveness in the low speed range, An electric power steering control device capable of suppressing noise and vibration is provided.
- An electric power steering control device controls a motor based on information of a torque sensor for detecting steering torque of a steering wheel, a vehicle speed sensor for detecting vehicle speed, a motor for assisting steering force, and the sensors.
- a control unit that calculates and outputs a control amount to be output, and the control unit includes target current setting means for calculating a target current from information of the sensors, and an actual current that detects an actual current supplied to the motor.
- the electric power steering control device comprising: a detecting means; a deviation calculating means for calculating a deviation between the target current value and the actual current; and a control amount setting means for calculating / outputting a control amount in accordance with the deviation.
- the control amount setting means includes PI control calculation means comprising at least a proportional term and an integral term, and gain setting means for varying the gain of the proportional term in accordance with the deviation and the vehicle speed, and using the gain, the proportional term is determined.
- the PI control calculation is performed by calculating and setting the gain of the integral term to a predetermined constant value.
- the gain of the proportional term (P term) is variable and the PI control is performed by setting the gain of the integral term (I term) to a predetermined constant value, the control responsiveness in the low speed range is achieved. Noise and vibration can be suppressed while improving the above.
- Embodiment 1 is an overall configuration diagram of an electric power steering control device according to Embodiment 1 of the present invention. It is a specific characteristic figure of the gain setting in Embodiment 1 of the present invention. It is a whole block diagram of the electric power steering control apparatus in Embodiment 2 of this invention. It is a specific characteristic figure of the gain setting in Embodiment 3 of the present invention. It is a whole block diagram of the electric power steering control apparatus in Embodiment 3 of this invention.
- FIG. 1 is an overall configuration diagram of a power steering control device mounted on a vehicle.
- a control unit hereinafter referred to as an ECU 1 for controlling the control
- a torque sensor 2 mounted near the steering wheel for detecting steering torque
- a vehicle speed sensor 3 for detecting the vehicle speed
- a motor 4 for assisting the steering force of the steering wheel.
- the ECU 1 with a built-in CPU inputs information from the steering torque signal (Ts) detected by the torque sensor 2 and the vehicle speed signal (Vs) detected by the vehicle speed sensor 3, and sets the target current (Ii). 10, an actual current detecting means 18 for measuring the actual current (Im) supplied to the motor 4, and a deviation calculating means 11 for obtaining a deviation ( ⁇ I) between the target current (Ii) and the actual current (Im).
- a control amount setting means 19 for performing a PI control calculation based on this deviation and outputting the calculation signal
- a driving means 17 configured by a bridge circuit composed of switching elements to drive the motor 4, and the control amount setting means 19
- Control amount output means 16 for converting the output of the above to a control amount (Dy) to the switching element of the driving means 17.
- control amount setting unit 19 calculates the proportional term and outputs a proportional signal (KpI), the proportional unit 13 that calculates the integral term and outputs the integral signal (KiI), and the calculation results of both. Is added between the deviation calculating means 11 and the proportional means 13, and a gain setting means 12 for inputting the vehicle speed signal (Vs) detected by the vehicle speed sensor 3. .
- gain setting means 12 for changing the gain of the proportional term in accordance with the current deviation ( ⁇ I) and the vehicle speed signal (Vs) is inserted only into the proportional means 13. Is not inserted into the integral term. Therefore, the integral term gain is calculated based on a predetermined constant gain that does not change with vehicle speed and deviation, while the proportional term is calculated using a variable gain ( ⁇ I2). It is.
- characteristic I2b (solid line) is gain in a region where deviation ⁇ I is small ( ⁇ I1 or less).
- ⁇ Gain ⁇ characteristic in the region where the deviation ⁇ I is large in the ⁇ characteristic ( ⁇ I1 or more).
- the characteristic I2a (dotted line) is selected.
- the characteristic I2b (solid line) is selected.
- the gain of the proportional term is controlled to be variable according to the vehicle speed and the deviation, and the integral term is controlled to be a predetermined constant value. Further, at least the vehicle speed is divided into a low speed region and a high speed region, and different gains are set in the respective regions, and a higher gain is set in the high speed region than in the low speed region. The gain tends to increase as the deviation increases, and the region where the deviation is small in the low speed range is the smallest value among all gains.
- the proportional term is different from the value of the integral term in that the control amount originally calculated in accordance with the deviation, and the responsiveness can be further improved by making the gain further variable.
- the gain is made variable according to the deviation.
- the control is effective, and there is little possibility of inducing noise and vibration by increasing the gain.
- the proportional term gain variable according to the vehicle speed and the deviation, it is possible to achieve both noise / vibration and responsiveness.
- Embodiment 2 will be described with reference to FIGS.
- the position of the gain setting means 12 is changed.
- the gain setting means 12 is inserted between the deviation calculating means 11 and the proportional means 13 in the first embodiment.
- the means 13 and the integrating means 14 are inserted in parallel.
- the gain setting means 12 calculates a proportional term gain (Kp) based on the deviation ( ⁇ I) and the vehicle speed (Vs), and the proportional means 13 multiplies the deviation ( ⁇ I) by Kp to calculate KpI.
- Kp proportional term gain
- Fig. 4 (a) is a characteristic diagram showing the specific contents of the gain setting means in the low speed range.
- the vehicle speed is less than 20 km / h.
- the horizontal axis represents the deviation ( ⁇ I) between the target current and the actual current, and the vertical axis represents the proportional term gain (Kp).
- the gain is relatively small.
- FIG. 4B is a characteristic diagram in the high speed region, which shows a characteristic (23) in which the gain (Kp) is proportionally increased in accordance with the deviation ( ⁇ I).
- the gain (Kp) of the proportional term variable according to the vehicle speed and the deviation while keeping the gain of the integral term constant, it is possible to achieve control that improves steering feeling with emphasis on responsiveness.
- the gain is fixed at the maximum value, so that the gain becomes too high even in the high speed range so as not to deteriorate the convergence of the control. Consideration.
- FIG. 4 (c) shows a characteristic (24) having a multistage change in which the gain (Kp) of the proportional term does not continuously change according to the deviation ( ⁇ I).
- the characteristic of 24a is a low speed region
- 24b is the characteristic of a high speed region. Similar effects can be obtained even with a plurality of constant gains with respect to the deviation as shown in FIG.
- Embodiment 3 will be described with reference to FIG.
- a differential term is added.
- a differentiating means 21 is added in parallel with the proportional means 13 and the integrating means 14, and the gain setting of the first and second embodiments is also performed.
- a first gain setting means 12 and a second gain setting means 20 are provided.
- Differentiating means 21 for calculating the differential term is added to calculate the control amount.
- the first gain setting means 12 and the second gain setting means 20 calculate the proportional term gain (kp) and the differential gain (kd) based on the deviation ( ⁇ I) and the vehicle speed signal (Vs), and the proportional means 13 ⁇ p is multiplied by kp to calculate KpI, and the differentiating means 21 multiplies ⁇ I by kd to calculate KdI.
- either linearly variable or multi-stage may be selected according to the deviation as in the second embodiment.
- the gain of the proportional term and the differential term can be made variable, so not only the response when the deviation is large, but also the tendency that the deviation will increase in the future even if the deviation is small. As a result, it is possible to take an early response, and further improve the responsiveness.
- control unit 1 control unit, 2 torque sensor, 3 vehicle speed sensor, 4 motor, 10 target current setting means, 11 deviation calculating means, 12, 20 Gain setting means, 13 proportional means, 14 integrating means, 15 addition means, 16 control amount output means, 17 drive means, 18 real current detection means, 19 control amount setting means.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Steering Control In Accordance With Driving Conditions (AREA)
- Power Steering Mechanism (AREA)
- Control Of Electric Motors In General (AREA)
Abstract
Description
電動パワーステアリング制御装置の分野において、特にノイズ低減に支配的な要素を調査すると、比例項(P項)が主流であって、積分項(I項)はそれほど影響しないことが判明した。
この発明の目的は、比例項(P項)のゲインを可変とすると共に、積分項(I項)のゲインを予め決められた一定値とすることにより、低速域の応答性を確保しつつ、ノイズ、振動を抑制することができる電動パワーステアリング制御装置を提供するものである。
前記制御量設定手段は、少なくとも比例項と積分項からなるPI制御演算手段と、前記偏差及び車速に応じて比例項のゲインを可変するゲイン設定手段を備え、このゲインを用いて前記比例項を演算し、前記積分項のゲインは予め決められた一定値とすることによりPI制御演算を行うことを特徴とするものである。
以下、この発明の実施の形態1を図に基づいて説明する。図1は、車両に装着されたパワーステアリング制御装置の全体構成図である。制御を司る制御ユニット(以下、ECUという)1と、ハンドル付近に搭載され操舵トルクを検出するトルクセンサ2と、車速を検出する車速センサ3と、ハンドルの操舵力をアシストするモータ4とから構成されている。
図2は実施の形態1の具体的なゲイン設定例を示すものであり、特性I2a(点線)はゲイン=α特性、特性I2b(実線)は偏差△Iが小さい領域(△I1以下)ではゲイン<α特性で、偏差△Iが大きい領域(△I1以上)ではゲイン=α特性となるものである。
車速が所定値、例えば20km/h以上の場合は特性I2a(点線)を選択し、車速が所定値未満、例えば20km/h以下の場合は特性I2b(実線)を選択するとよい。
次に実施の形態2について図3、図4を用いて説明する。図1と比較してゲイン設定手段12の位置を変更したものであり、具体的にはゲイン設定手段12を実施の形態1では偏差演算手段11と比例手段13との間に挿入したが、比例手段13と積分手段14と並列に挿入したものである。ゲイン設定手段12は偏差(△I)と車速(Vs)に基いて比例項ゲイン(Kp)を算出し、比例手段13は偏差(△I)にKpを掛けてKpIを算出している。
次に実施の形態3について図5を用いて説明する。実施の形態1、2と比較して微分項を追加したものであり、具体的には比例手段13、積分手段14と並列に微分手段21を追加すると共に、実施の形態1、2のゲイン設定手段12に代わり第1のゲイン設定手段12と第2のゲイン設定手段20を設けている。微分項を演算する微分手段21が制御量を演算するために追加されている。第1のゲイン設定手段12および第2のゲイン設定手段20は偏差(△I)と車速信号(Vs)に基いて比例項ゲイン(kp)、微分ゲイン(kd)を算出し、比例手段13は△Iにkpを掛けてKpIを算出し、微分手段21は△Iにkdを掛けてKdIを算出している。
10 目標電流設定手段、11 偏差演算手段、
12、20 ゲイン設定手段、13 比例手段、14 積分手段、
15 加算手段、16 制御量出力手段、17 駆動手段、
18 実電流検出手段、19 制御量設定手段。
Claims (8)
- ハンドルの操舵トルクを検出するトルクセンサと、車速を検出する車速センサと、操舵力をアシストするモータと、前記両センサの情報を基に前記モータを制御する制御量を演算・出力する制御ユニットとから構成され、前記制御ユニットは、前記両センサの情報から目標電流を演算する目標電流設定手段と、前記モータに供給された実電流を検出する実電流検出手段と、前記目標電流値と実電流値の偏差を演算する偏差演算手段と、この偏差に応じて制御量を演算・出力する制御量設定手段とを備えた電動パワーステアリング制御装置において、
前記制御量設定手段は、少なくとも比例項と積分項からなるPI制御演算手段を備え、前記偏差及び車速に応じて比例項のゲインを可変するゲイン設定手段を有し、このゲインを用いて前記比例項を演算し、前記積分項のゲインは予め決められた一定値とすることによりPI制御演算を行うことを特徴とする電動パワーステアリング制御装置。 - 前記ゲイン設定手段は、少なくとも車速を低速域と高速域に2分し、それぞれの領域で異なるゲインを設定するとともに、高速域の方が低速域に比較して大きなゲインを設定することを特徴とする請求項1に記載の電動パワーステアリング制御装置。
- 前記ゲイン設定手段は、偏差が大きくなるにつれて、ゲインも大きくなる傾向を示すことを特徴とする請求項1あるいは2に記載の電動パワーステアリング制御装置。
- 前記ゲイン設定手段は、低速域で偏差が小さい領域が全ゲインの中で最も小さい値としたことを特徴とする請求項1から3のいずれか1項に記載の電動パワーステアリング制御装置。
- 前記ゲイン設定手段は、偏差及び車速に応じて多段階のゲイン値から設定することを特徴とする請求項1から4のいずれか1項に記載の電動パワーステアリング制御装置。
- 前記ゲイン設定手段は、前記偏差演算手段と比例手段との間に挿入され、前記偏差演算手段から出力される偏差信号(△I)と車速信号(Vs)が入力されることを特徴とする請求項1に記載の電動パワーステアリング制御装置。
- 前記ゲイン設定手段は、前記比例手段と積分手段と互いに並列接続され、前記偏差演算手段から出力される偏差信号(△I)と車速信号(Vs)が入力されることを特徴とする請求項1に記載の電動パワーステアリング制御装置。
- 前記制御量設定手段は、PI制御手段に微分項も含み、ゲイン設定手段は積分項以外の比例項と微分項の各ゲインを偏差及び車速に応じて設定できるようにしたことを特徴とする請求項1に記載の電動パワーステアリング制御装置。
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PCT/JP2013/082363 WO2015083215A1 (ja) | 2013-12-02 | 2013-12-02 | 電動パワーステアリング制御装置 |
JP2015551278A JPWO2015083215A1 (ja) | 2013-12-02 | 2013-12-02 | 電動パワーステアリング制御装置 |
CN201380081357.0A CN105793140B (zh) | 2013-12-02 | 2013-12-02 | 电动助力转向控制装置 |
US15/022,269 US9840274B2 (en) | 2013-12-02 | 2013-12-02 | Electric power steering control device |
EP13898810.0A EP3078572B1 (en) | 2013-12-02 | 2013-12-02 | Electric power steering control device |
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PCT/JP2013/082363 WO2015083215A1 (ja) | 2013-12-02 | 2013-12-02 | 電動パワーステアリング制御装置 |
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JP (1) | JPWO2015083215A1 (ja) |
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DE102022128460A1 (de) * | 2022-10-27 | 2024-05-02 | Schaeffler Technologies AG & Co. KG | Regelung einer elektrischen Maschine mit zwei getrennten Wicklungssystemen und Betrieb eines Aktuators eines Steer-By-Wire-Systems |
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- 2013-12-02 US US15/022,269 patent/US9840274B2/en active Active
- 2013-12-02 CN CN201380081357.0A patent/CN105793140B/zh active Active
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JP2012218498A (ja) * | 2011-04-05 | 2012-11-12 | Asmo Co Ltd | 電動パワーステアリング制御装置 |
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EP3078572A1 (en) | 2016-10-12 |
US20160221602A1 (en) | 2016-08-04 |
CN105793140B (zh) | 2018-05-15 |
JPWO2015083215A1 (ja) | 2017-03-16 |
US9840274B2 (en) | 2017-12-12 |
CN105793140A (zh) | 2016-07-20 |
EP3078572B1 (en) | 2018-11-21 |
EP3078572A4 (en) | 2017-07-26 |
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