JP2003102105A - Control device for electric vehicle - Google Patents

Control device for electric vehicle

Info

Publication number
JP2003102105A
JP2003102105A JP2001289615A JP2001289615A JP2003102105A JP 2003102105 A JP2003102105 A JP 2003102105A JP 2001289615 A JP2001289615 A JP 2001289615A JP 2001289615 A JP2001289615 A JP 2001289615A JP 2003102105 A JP2003102105 A JP 2003102105A
Authority
JP
Japan
Prior art keywords
command value
vibration
predetermined
torque command
current
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.)
Granted
Application number
JP2001289615A
Other languages
Japanese (ja)
Other versions
JP4838462B2 (en
Inventor
Masaaki Nagai
正明 長井
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Subaru Corp
Original Assignee
Fuji Heavy Industries Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Fuji Heavy Industries Ltd filed Critical Fuji Heavy Industries Ltd
Priority to JP2001289615A priority Critical patent/JP4838462B2/en
Publication of JP2003102105A publication Critical patent/JP2003102105A/en
Application granted granted Critical
Publication of JP4838462B2 publication Critical patent/JP4838462B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Abstract

PROBLEM TO BE SOLVED: To provide a control device for an electric vehicle which is capable of effectively reducing vibration of car body. SOLUTION: The control device for the electric vehicle, equipped with a torque command value calculation means 31 which calculates and outputs a predetermined torque value according to the amount of acceleration operation A, an electric current command value calculating means 32 which calculates and outputs a predetermined electric current command values according to the torque command values, and an electric current detecting means which detects the input electric current to be inputted to an electric motor, a control means 33 which outputs electric current to the electric motor according to the electric current command value and controls the electric motor, is equipped with a vibration determination means 34 which determines whether the vibration of the input current is in a predetermined vibration status, and a command value reduction means which reduces the torque command value of the electric current command value to the predetermined value, when the vibration of the input current is determined as being in the predetermined vibration status.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【発明の属する技術分野】本発明は、電気自動車の制御
装置に関し、特に、車体振動を効果的に抑制することの
できる電気自動車の制御装置に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for an electric vehicle, and more particularly to a control device for an electric vehicle capable of effectively suppressing vehicle body vibration.

【0002】[0002]

【従来の技術】近年、環境汚染や騒音の防止・抑制のた
めに、ガソリンエンジンやディーゼルエンジンなどの内
燃機関で走行する自動車に代えて、電動機で走行する電
気自動車(ハイブリッド車を含む)の開発が進んでい
る。このような電気自動車の駆動源である電動機として
は、直流モータや交流モータが採用されており、中でも
回転子に永久磁石を使用した三相交流同期モータ(以
下、「同期モータ」という)は高効率であるため、電気
自動車用の電動機の主流とされている。
2. Description of the Related Art In recent years, in order to prevent and suppress environmental pollution and noise, the development of electric vehicles (including hybrid vehicles) that run on electric motors instead of vehicles that run on internal combustion engines such as gasoline engines and diesel engines. Is progressing. A direct current motor or an alternating current motor is adopted as an electric motor which is a drive source of such an electric vehicle, and among them, a three-phase alternating current synchronous motor using a permanent magnet for a rotor (hereinafter, referred to as “synchronous motor”) is high. Due to its efficiency, it is regarded as the mainstream of electric motors for electric vehicles.

【0003】前記した同期モータを搭載した電気自動車
においては、車両に搭載したバッテリからの直流電流を
インバータで所定の交流電流に変換し、この交流電流に
よって同期モータを駆動して車両を走行させている。
In an electric vehicle equipped with the above-mentioned synchronous motor, a direct current from a battery mounted on the vehicle is converted into a predetermined alternating current by an inverter, and the alternating current drives the synchronous motor to drive the vehicle. There is.

【0004】この際には、アクセルペダルの操作量(以
下、「アクセル操作量」という)に応じて所定のトルク
指令値の演算および出力を行い、このトルク指令値に応
じて所定の電流指令値の演算および出力を行い、この電
流指令値に応じた電流を所定の制御手段によって制御し
つつインバータを介して同期モータに供給して同期モー
タを駆動制御しており、同期モータの出力トルクは、所
定のトルク指令値に応じて追従するようにオープンルー
プ制御される。
At this time, a predetermined torque command value is calculated and output according to the operation amount of the accelerator pedal (hereinafter referred to as "accelerator operation amount"), and a predetermined current command value is calculated according to the torque command value. Of the current command value is supplied to the synchronous motor through the inverter while controlling the current according to the current command value by the predetermined control means to drive and control the synchronous motor. Open loop control is performed so as to follow the predetermined torque command value.

【0005】[0005]

【発明が解決しようとする課題】ところで、前記したよ
うな電気自動車では、同期モータの出力軸からディファ
レンシャルギアおよびドライブシャフトを介して駆動輪
へと至るトルクの伝達系が、ドライブシャフトをバネ要
素とした「ねじれ共振系」を構成している。このため、
急発進時や急加速時のようにアクセルペダルを急激に踏
み込むと、制御手段によって同期モータの出力トルクが
これに追従するように制御されるが、この急激な出力ト
ルクの増加によって前記した「ねじれ共振系」が共振
し、車体振動が発生することがあった。
In the electric vehicle as described above, the torque transmission system from the output shaft of the synchronous motor to the drive wheels via the differential gear and the drive shaft uses the drive shaft as a spring element. It constitutes a "torsion resonance system". For this reason,
When the accelerator pedal is suddenly depressed, such as during sudden start or sudden acceleration, the output torque of the synchronous motor is controlled by the control means so as to follow it. The "resonance system" resonated and sometimes caused vehicle vibration.

【0006】前記したような電気自動車の車体振動を抑
制するための従来の方法としては、(1)同期モータの
回転速度を検出し、この回転速度から同期モータの出力
トルク変動を推定し、この推定結果に基づいてトルク指
令値を補正することで、同期モータの出力トルクを抑制
するという方法や、(2)同期モータの回転速度を検出
し、この回転速度からトルク指令振動抑制成分を算出し
てトルク指令値を補正することで、同期モータの出力ト
ルクを抑制するという方法が提案されている。
As a conventional method for suppressing the vehicle body vibration of the electric vehicle as described above, (1) the rotational speed of the synchronous motor is detected, and the output torque fluctuation of the synchronous motor is estimated from this rotational speed, A method of suppressing the output torque of the synchronous motor by correcting the torque command value based on the estimation result, or (2) detecting the rotational speed of the synchronous motor and calculating the torque command vibration suppression component from this rotational speed. A method has been proposed in which the output torque of the synchronous motor is suppressed by correcting the torque command value.

【0007】前記したような振動抑制方法においては、
トルク指令値を定めるアクセル操作量と、トルク指令値
の補正のためにフィードバックする回転速度との対応関
係が安定していることが要求されるが、一般的に、自動
車のシステム特性は経時的に変化し、電気自動車におい
てはアクセル操作量と回転速度との対応関係も経時的に
変化するため、走行の初期段階においては振動抑制効果
を得ることができても、時間が経過すると充分にトルク
指令値を補正することができなくなる場合があった。こ
のようなシステムの経時変化に対応させるためには、き
わめて高度なチューニングが要求されるため、その実用
化のためには費用や手間がかかることとなっていた。
In the vibration suppressing method as described above,
It is required that the correspondence between the accelerator operation amount that determines the torque command value and the rotation speed that is fed back to correct the torque command value be stable, but generally, the system characteristics of an automobile will change with time. In an electric vehicle, the correspondence between the accelerator operation amount and the rotation speed also changes over time, so even if the vibration suppression effect can be obtained in the initial stage of running, a sufficient torque command will be obtained over time. In some cases, the value could not be corrected. In order to cope with such a change with time of the system, an extremely high level of tuning is required, and it has been costly and troublesome to put it into practical use.

【0008】本発明の課題は、車体振動を効果的に抑制
することができる電気自動車の制御装置を提供すること
である。
An object of the present invention is to provide a control device for an electric vehicle that can effectively suppress vehicle body vibration.

【0009】[0009]

【課題を解決するための手段】以上の課題を解決するた
めに、請求項1記載の発明は、例えば図2および図4に
示したように、アクセル操作量に応じて所定のトルク指
令値の演算および出力を行うトルク指令値演算手段と、
前記トルク指令値に応じて所定の電流指令値の演算およ
び出力を行う電流指令値演算手段と、電動機へ入力され
る入力電流を検出する電流検出手段と、前記電流指令値
に応じた電流を前記電動機に出力することにより駆動手
段を介して前記電動機を駆動制御する駆動制御手段を備
える電気自動車の制御装置において、前記入力電流の振
動が所定の振動状態にあるか否かを判定する振動判定手
段と、前記入力電流の振動が所定の振動状態にあると判
定された場合に、トルク指令値または電流指令値を所定
値まで低減させる指令値低減手段とを備えることを特徴
とする。
In order to solve the above-mentioned problems, the invention according to claim 1 provides a predetermined torque command value according to the accelerator operation amount, as shown in FIGS. 2 and 4, for example. A torque command value calculating means for calculating and outputting,
A current command value calculating means for calculating and outputting a predetermined current command value according to the torque command value, a current detecting means for detecting an input current input to the electric motor, and a current corresponding to the current command value for the current. In a control device for an electric vehicle, which includes a drive control unit that drives and controls the electric motor by outputting the electric current to a motor, a vibration determination unit that determines whether or not the vibration of the input current is in a predetermined vibration state. And a command value reducing means for reducing the torque command value or the current command value to a predetermined value when it is determined that the vibration of the input current is in a predetermined vibration state.

【0010】請求項1記載の発明によれば、電動機へ入
力される入力電流の振動が所定の振動状態にあるか否か
を判定する振動判定手段を備えており、この入力電流の
振動状態の変化と車体振動とは、後述するように一定の
対応関係があるため、入力電流の振動が所定の振動状態
にあるか否かを判定することによって、車体振動を効果
的に検出することができる。
According to the first aspect of the present invention, there is provided vibration determining means for determining whether or not the vibration of the input current input to the electric motor is in a predetermined vibration state. Since the change and the vehicle body vibration have a certain correspondence relationship as described later, the vehicle body vibration can be effectively detected by determining whether or not the vibration of the input current is in a predetermined vibration state. .

【0011】すなわち、電動機の駆動制御システムにお
いては、モータの回転に同期させてステータコイルに回
転磁界を形成してモータを駆動させており、急発進時や
急加速時における「ねじれ共振系」の共振などによって
車体振動が生じると、電動機への入力電流の振動状態が
変化する。従って、電動機への入力電流の振動状態が所
定レベルに達したか否かを判定することによって、車体
振動を効果的に検出することができる。
That is, in the drive control system for the electric motor, the rotating magnetic field is formed in the stator coil in synchronization with the rotation of the motor to drive the motor, and the "torsion resonance system" of the "torsion resonance system" at the time of sudden start or sudden acceleration is generated. When body vibration occurs due to resonance or the like, the vibration state of the input current to the electric motor changes. Therefore, the vehicle body vibration can be effectively detected by determining whether or not the vibration state of the input current to the electric motor has reached a predetermined level.

【0012】また、請求項1記載の発明によれば、入力
電流の振動が所定の振動状態にあると判定された場合
に、トルク指令値または電流指令値を所定値まで低減さ
せる指令値低減手段とを備えるため、急発進時や急加速
時における「ねじれ共振系」の共振を抑制することがで
き、結果的に車体振動を抑制することができる。
According to the first aspect of the invention, when it is determined that the vibration of the input current is in a predetermined vibration state, a command value reducing means for reducing the torque command value or the current command value to a predetermined value. Since it is provided, it is possible to suppress the resonance of the “torsion resonance system” at the time of sudden start or sudden acceleration, and as a result, it is possible to suppress the vehicle body vibration.

【0013】請求項2記載の発明は、請求項1記載の電
気自動車の制御装置において、例えば図6に示すよう
に、前記振動判定手段は、前記入力電流の振幅が連続的
に所定値を超え、かつ、前記所定値を連続的に超えた回
数が所定回数を超えたか否かによって、前記入力電流の
振動が所定の振動状態にあるか否かを判定することを特
徴とする。
According to a second aspect of the present invention, in the control device for an electric vehicle according to the first aspect, for example, as shown in FIG. 6, the vibration determining means continuously causes the amplitude of the input current to exceed a predetermined value. Further, it is characterized in that whether or not the vibration of the input current is in a predetermined vibration state is determined depending on whether or not the number of times that the predetermined value is continuously exceeded exceeds a predetermined number of times.

【0014】請求項2記載の発明によれば、請求項1記
載の発明の奏する作用効果に加え、振動判定手段は、入
力電流の振幅が連続的に所定値を超え、かつ、連続的に
所定値を超えた回数が所定回数を超えたか否かによっ
て、入力電流の振動が所定の振動状態に達したか否かを
判定するため、入力電流の振動が所定の振動状態にある
か否か、ひいては、車体振動が発生したか否かを簡易か
つ正確に検出することができる。
According to the second aspect of the present invention, in addition to the effect of the first aspect of the present invention, the vibration determining means has the amplitude of the input current continuously exceeding the predetermined value and continuously determining the amplitude. Whether the vibration of the input current is in a predetermined vibration state is determined by determining whether or not the vibration of the input current has reached a predetermined vibration state depending on whether the number of times the value is exceeded exceeds a predetermined number of times. As a result, it is possible to easily and accurately detect whether or not the vehicle body vibration has occurred.

【0015】請求項3記載の発明は、請求項1または2
記載の電気自動車の制御装置において、例えば、図4に
示すように、前記入力電流の振動が所定の振動状態にな
いと判定された場合に、前記指令値低減手段により低減
されたトルク指令値または電流指令値を漸次回復させる
指令値回復手段を備えることを特徴とする。
The invention according to claim 3 is the invention according to claim 1 or 2.
In the control device for the electric vehicle described above, for example, as shown in FIG. 4, when it is determined that the vibration of the input current is not in a predetermined vibration state, the torque command value reduced by the command value reduction means or It is characterized in that it is provided with a command value recovery means for gradually recovering the current command value.

【0016】請求項3記載の発明によれば、請求項1ま
たは2記載の発明の奏する作用効果に加え、入力電流の
振動が所定の振動状態にないと判定された場合に、指令
値低減手段により低減されたトルク指令値または電流指
令値を漸次回復させる指令値回復手段を備えるため、入
力電流の振動が所定の振動状態にない場合、すなわち車
体振動が無視できる程度のレベルに達した場合には、速
やかに電動機の出力トルクを増加させることができる。
従って、車体振動を抑制しながら高い加速性能を発揮す
ることができる。
According to the invention of claim 3, in addition to the effect of the invention of claim 1 or 2, when it is determined that the vibration of the input current is not in a predetermined vibration state, the command value reducing means is provided. Since a command value recovery means for gradually recovering the torque command value or the current command value reduced by is provided, when the vibration of the input current is not in a predetermined vibration state, that is, when the body vibration reaches a level that can be ignored. Can promptly increase the output torque of the electric motor.
Therefore, high acceleration performance can be exhibited while suppressing vehicle body vibration.

【0017】[0017]

【発明の実施の形態】以下、本発明の実施の形態を、図
面に基づいて詳細に説明する。本実施の形態では、電動
機である三相交流同期モータ(同期モータ)10で走行
する電気自動車の制御装置について説明することとす
る。
BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below in detail with reference to the drawings. In the present embodiment, a control device for an electric vehicle that is driven by a three-phase AC synchronous motor (synchronous motor) 10, which is an electric motor, will be described.

【0018】本実施の形態に係る電気自動車は、図1に
示すように、電力源としてのバッテリ20、同期モータ
10をベクトル制御する制御装置30、制御装置30で
制御されバッテリ20の出力を交流電力に変換する電力
変換機であるインバータ40、同期モータ10の回転速
度を検出する回転速度検出手段であるレゾルバ50、同
期モータ10への入力電流を検出する電流検出手段6
0、アクセル操作量を検出するアクセル操作量検出器7
0、同期モータ10の回転運動をドライブシャフト90
に伝達するディファレンシャルギア80、および、ドラ
イブシャフト90の両端に設けられた駆動輪100を備
えている。
The electric vehicle according to the present embodiment, as shown in FIG. 1, is a battery 20 as a power source, a controller 30 for vector-controlling the synchronous motor 10, and an output of the battery 20 controlled by the controller 30 is an alternating current. An inverter 40 which is a power converter for converting into electric power, a resolver 50 which is a rotation speed detecting means for detecting the rotation speed of the synchronous motor 10, and a current detecting means 6 for detecting an input current to the synchronous motor 10.
0, accelerator operation amount detector 7 for detecting the accelerator operation amount
0, drive shaft 90 to rotate the synchronous motor 10
A differential gear 80 for transmitting the power to the drive shaft 100, and drive wheels 100 provided at both ends of the drive shaft 90.

【0019】同期モータ10は、ディファレンシャルギ
ア80およびドライブシャフト90を介して駆動輪10
0と連結され、同期モータ10の回転運動により駆動輪
100が回転し車両に推進力を与えるようにされてい
る。バッテリ20からインバータ40に供給された直流
電力は、制御装置30の制御のもとに三相交流電力に変
換されて同期モータ10に供給される。
The synchronous motor 10 has a drive wheel 10 via a differential gear 80 and a drive shaft 90.
The drive wheel 100 is connected to the drive wheel 100 by the rotational movement of the synchronous motor 10 to give a propulsive force to the vehicle. The DC power supplied from the battery 20 to the inverter 40 is converted into three-phase AC power under the control of the control device 30 and supplied to the synchronous motor 10.

【0020】制御装置30は、図2に示すように、トル
ク指令値演算手段31、電流指令値演算手段32、電流
制御手段33および振動判定手段34を備える。トルク
指令値演算手段31は、アクセル操作量検出器70で検
出されたアクセル操作量Aおよびレゾルバ50で検出さ
れた同期モータ10の回転速度Nに応じて所定のトルク
指令値T*の演算および出力を行い、電流指令値演算手
段32は、トルク指令値T*に応じて所定の電流指令値
d *およびIq *の演算および出力を行う。ここでId *
よびIq *は、それぞれベクトル制御に用いられる電流指
令値のd軸成分およびq軸成分である。
As shown in FIG. 2, the control device 30 comprises a torque command value calculation means 31, a current command value calculation means 32, a current control means 33 and a vibration determination means 34. The torque command value calculation means 31 calculates and outputs a predetermined torque command value T * according to the accelerator operation amount A detected by the accelerator operation amount detector 70 and the rotation speed N of the synchronous motor 10 detected by the resolver 50. Then, the current command value computing means 32 computes and outputs predetermined current command values I d * and I q * according to the torque command value T * . Here, I d * and I q * are the d-axis component and the q-axis component of the current command value used for vector control, respectively.

【0021】電流制御手段33は、図3に示すように、
dq軸電流制御手段33a、2/3相変換手段33b、
PWM信号発生手段33cおよび3/2相変換手段33
dを備える。dq軸電流制御手段33aは、電流指令値
d *およびIq *と、同期モータ10の回転速度Nと、電
流検出手段60で検出された同期モータ10への入力電
流Iu、Iv、Iwを3/2相変換手段33dで変換して
得たId、Iqとに基づいて、電圧指令値Vd *、Vq *の演
算及び出力を行う。
The current control means 33, as shown in FIG.
dq axis current control means 33a, 2/3 phase conversion means 33b,
PWM signal generating means 33c and 3/2 phase converting means 33
d. The dq axis current control means 33a uses the current command values I d * and I q * , the rotation speed N of the synchronous motor 10, the input currents I u and I v to the synchronous motor 10 detected by the current detection means 60, The voltage command values V d * and V q * are calculated and output based on I d and I q obtained by converting I w by the 3/2 phase conversion means 33 d .

【0022】PWM信号発生手段33cは、電圧指令値
d *、Vq *を2/3相変換手段33bで2/3相変換し
て得たVu *、Vv *、Vw *に基づいてPWM信号Pu
v、P wを発生させてインバータ40に出力し、このP
WM信号によってインバータ40のスイッチング素子を
所定のタイミングでオン/オフ操作することによって、
同期モータ10を制御するように機能する。
The PWM signal generating means 33c has a voltage command value.
Vd *, Vq *Is converted into 2/3 phase by the 2/3 phase conversion means 33b.
Obtained Vu *, Vv *, Vw *Based on the PWM signal Pu,
Pv, P wIs generated and output to the inverter 40.
The switching element of the inverter 40 is driven by the WM signal.
By turning on / off at a predetermined timing,
It functions to control the synchronous motor 10.

【0023】振動判定手段34は、電流検出手段60で
検出された同期モータ10への入力電流Iu、Iv、Iw
を3/2相変換手段33dで3/2相変換して得たd軸
入力電流Idおよびq軸入力電流Iqのうち、q軸入力電
流Iqの振動状態が所定レベルにあるか否かを判定す
る。なお、本実施の形態では、Iqの振動状態のみが所
定レベルにあるか否かを判定しているが、Idの振動状
態が所定レベルにあるか否かを判定してもよく、Id
q双方の振動状態が所定レベルにあるか否かを判定す
ることとしてもよい。
The vibration determining means 34 includes input currents I u , I v , I w to the synchronous motor 10 detected by the current detecting means 60.
Of the d-axis input current I d and the q-axis input current I q obtained by the 3 / 2-phase conversion by the 3 / 2-phase conversion means 33d, whether the vibration state of the q-axis input current I q is at a predetermined level To determine. In the present embodiment, it is determined whether only the vibration state of I q is at the predetermined level, but it may be determined whether the vibration state of I d is at the predetermined level. d ,
It may be possible to determine whether or not both the vibration states of I q are at a predetermined level.

【0024】トルク指令値演算手段31は、図4に示す
ように、基本トルク指令値演算手段31a、トルク指令
値低減・回復手段31bおよび加減算器31cを備え
る。基本トルク指令値演算手段31aは、アクセル操作
量Aおよび回転速度Nに基づいて基本トルク指令値T0 *
の演算を行う。トルク指令値低減・回復手段31bは、
振動判定手段34によってq軸入力電流Iqの振動状態
が所定レベルにあると判定された場合に、基本トルク指
令値T0 *を所定値まで低減させるとともに、振動判定手
段34によってq軸入力電流Iqの振動状態が所定レベ
ルにないと判定された場合に、低減させた基本トルク指
令値T0 *を回復させるように機能する。
As shown in FIG. 4, the torque command value computing means 31 comprises a basic torque command value computing means 31a, a torque command value reducing / restoring means 31b and an adder / subtractor 31c. The basic torque command value calculation means 31a calculates the basic torque command value T 0 * based on the accelerator operation amount A and the rotation speed N.
Is calculated. The torque command value reducing / restoring means 31b is
When the vibration determination unit 34 determines that the vibration state of the q-axis input current I q is at a predetermined level, the basic torque command value T 0 * is reduced to a predetermined value, and the vibration determination unit 34 also causes the q-axis input current I q to decrease. When it is determined that the vibration state of I q is not at the predetermined level, it functions to restore the reduced basic torque command value T 0 * .

【0025】具体的には、Iqの振動状態が所定レベル
にあると判定された場合には、振動判定手段34がトル
ク指令値低減信号S-を出力し、このトルク指令値低減
信号S-に従ってトルク指令値低減・回復手段31bが
トルク指令低減値T- *を出力する。このトルク指令低減
値T- *と基本トルク指令値T0 *とによって加減算器31
dで低減させたトルク指令値T*を算出し、出力する。
[0025] More specifically, when the vibration state of the I q is determined to be a predetermined level, the vibration determination unit 34 and the torque command value reduced signal S - outputs, the torque command value reduced signal S - Accordingly, the torque command value reduction / restoration means 31b outputs the torque command reduction value T * . The torque command reduction value T - * and the basic torque command value T 0 * and the adder-subtracter 31
The torque command value T * reduced by d is calculated and output.

【0026】また、Iqの振動状態が所定レベルにない
と判定された場合には、振動判定手段34がトルク指令
値回復信号S+を出力し、このトルク指令値回復信号S+
に従ってトルク指令値低減・回復手段31bがトルク指
令回復値T+ *を出力する。このトルク指令回復値T+ *
基本トルク指令値増加速度T0 *とによって加減算器31
dで回復させたトルク指令値T*を算出し、出力する。
Further, when the vibration state of the I q is not determined to be in the predetermined level, the vibration determination unit 34 outputs a torque command value restoration signal S +, the torque command value restoration signal S +
Accordingly, the torque command value reduction / recovery means 31b outputs the torque command recovery value T + * . Based on the torque command recovery value T + * and the basic torque command value increasing speed T 0 * , the adder / subtractor 31
The torque command value T * recovered in d is calculated and output.

【0027】本実施の形態では、トルク指令値低減・回
復手段31bから出力されるトルク指令低減値T- *およ
びトルク指令回復値T+ *は、後述するように経時的に変
化するものとしている(図7参照)。
[0027] In this embodiment, are the torque command reduction value T output from the torque command value reduced and recovery means 31b - * and the torque command recovery value T + *, it is assumed that changes with time as described below (See Figure 7).

【0028】次いで、本実施の形態に係る電気自動車の
制御装置を用いた車体振動抑制制御動作を、図5を用い
て説明する。
Next, a vehicle body vibration suppression control operation using the control device for an electric vehicle according to the present embodiment will be described with reference to FIG.

【0029】まず、停止状態にある電気自動車のアクセ
ルペダルを急激に踏み込んで急発進させ、全開走行状態
(アクセル操作量100%での走行状態)へと移行させ
る。この状態においては、アクセル操作量Aおよび同期
モータ10の回転速度Nに応じてトルク指令値T*が随
時演算されて出力され、このトルク指令値T*に応じて
電流指令値I*が随時演算されて出力され、この電流指
令値I*に応じたPWM信号をインバータ40を介して
同期モータ10に出力することにより同期モータ10が
駆動制御されている。
First, the accelerator pedal of the electric vehicle in a stopped state is suddenly depressed to rapidly start the vehicle, and the vehicle is shifted to a fully open traveling state (a traveling state at an accelerator operation amount of 100%). In this state, the torque command value T * is calculated and output at any time according to the accelerator operation amount A and the rotation speed N of the synchronous motor 10, and the current command value I * is calculated at any time according to the torque command value T *. The synchronous motor 10 is driven and controlled by outputting a PWM signal corresponding to the current command value I * to the synchronous motor 10 via the inverter 40.

【0030】この際には、電流検出手段60によって同
期モータ10への入力電流Iu、Iv、Iwが検出され、
これらは3/2相変換手段33dでIdとIqに変換され
る。振動判定手段34には、これら入力電流のうちIq
のみが出力される(入力電流検出工程、S1参照)。
At this time, the current detection means 60 detects the input currents I u , I v , I w to the synchronous motor 10,
These are converted into I d and I q by the 3/2 phase conversion means 33d. The vibration determination means 34 uses the input current I q among these input currents.
Only the output is made (input current detection step, see S1).

【0031】全開走行状態に移行した後に、同期モータ
10の出力軸からディファレンシャルギア80およびド
ライブシャフト90を介して駆動輪100へと至るトル
クの伝達系(ねじれ共振系)が共振して車体振動が発生
すると、同期モータ10への入力電流Iu、Iv、Iw
振動状態が発生し、これに伴ってId、Iqの振動状態も
変化する。振動判定手段34は、このIqの振動が所定
の振動状態にあるか否かを判定する(振動判定工程、S
2参照)。
After shifting to the full-open running state, the torque transmission system (torsion resonance system) from the output shaft of the synchronous motor 10 to the drive wheels 100 via the differential gear 80 and the drive shaft 90 resonates to cause vehicle body vibration. When it occurs, the input currents I u , I v , and I w to the synchronous motor 10 are vibrated, and the vibrating states of I d and I q are changed accordingly. The vibration determining means 34 determines whether or not the vibration of I q is in a predetermined vibration state (vibration determining step, S
2).

【0032】Iqの振動状態が所定レベルにあるか否か
の判定は、以下のような手順で行う。まず、図6に示す
ようにIqの振幅を検出し、この振幅が所定値I0を超え
たか否かを判定し、この所定値I0を連続的に超えた回
数をカウントし、この回数が所定回数N0を超えた場合
に、Iqの振動状態が所定レベルにあると判定する。I q
の振幅の検出や、Iqの振幅と所定値I0との比較判定
や、所定値I0を連続的に超えた回数のカウントや、こ
の回数と所定回数N0との比較判定などは、全てマイク
ロコンピュータで行うことができる。
IqWhether the vibration state of the
The determination is made in the following procedure. First, shown in FIG.
Like IqIs detected, and this amplitude is a predetermined value I0Beyond
It is determined whether or not the predetermined value I0Times continuously exceeded
The number is counted, and this number is the predetermined number N0When exceeds
IqIt is determined that the vibration state of is at a predetermined level. I q
Of the amplitude ofqAmplitude and predetermined value I0Comparison judgment with
Or a predetermined value I0The number of times the
And the number of times N0All comparison and judgment with
Computer can be used.

【0033】Iqの振動が所定の振動状態にあると判定
した場合には、振動判定手段34は、トルク指令値演算
手段31にトルク指令値低減信号S-を出力し、このト
ルク指令値低減信号S-に従ってトルク指令値低減・回
復手段31bがトルク指令低減値T- *を出力する。この
トルク指令低減値T- *を、基本トルク指令値T0 *から加
減算器31dで減じて低減させたトルク指令値T*を算
出し、出力する(トルク指令値低減工程、S3参照)。
When it is judged that the vibration of I q is in a predetermined vibration state, the vibration judging means 34 outputs a torque command value reduction signal S - to the torque command value calculating means 31 to reduce the torque command value. signal S - torque command value reduced and recovery means 31b torque command reduction value T in accordance with - output *. The torque command reduction value T - a *, the basic torque command value T 0 * to calculate the subtracter torque command value is reduced by subtracting at 31d T * from the output to (torque command value reduction step, see S3).

【0034】本実施の形態においては、トルク指令値の
下限をT’*(所定低減値)と定めており、トルク指令
値T*がこの所定低減値T’*に達した場合には、トルク
指令低減値T- *の出力を行わないこととしている。
In this embodiment, the lower limit of the torque command value is set to T ' * (predetermined reduction value), and when the torque command value T * reaches this predetermined reduction value T' * , the torque is It is set to be not output the * - instruction reduction value T.

【0035】トルク指令値低減工程S3によってトルク
指令値T*が緩められた結果、車体振動が抑制され、Iq
の振動が通常の振動状態へと回復した場合には、振動判
定手段34によってIqの振動が所定の振動状態にない
と判定される(振動判定工程、S2参照)。
As a result of the torque command value T * being loosened in the torque command value reducing step S3, vehicle body vibration is suppressed and I q
When the vibration of No. 1 is restored to the normal vibration state, the vibration determination unit 34 determines that the vibration of I q is not in the predetermined vibration state (vibration determination step, S2).

【0036】Iqの振動が所定の振動状態にないと判定
された場合には、振動判定手段34によってトルク指令
値回復信号S+が出力され、このトルク指令値回復信号
+に従ってトルク指令値低減・回復手段31bがトル
ク指令回復値T+ *を出力する。このトルク指令回復値T
+ *と基本トルク指令値T0 *とによって加減算器31dで
回復させたトルク指令値T*を算出し、出力する(トル
ク指令値回復工程、S4参照)。
[0036] When the vibration of I q is not determined to be in the predetermined vibration state, the vibration determination unit 34 and the torque command value restoration signal S + is output by the torque command value restoration signal S torque command value in accordance with + The reduction / restoration means 31b outputs the torque command restoration value T + * . This torque command recovery value T
+ * And calculates the torque command value T * which is recovered by subtractor 31d by the basic torque command value T 0 *, and outputs (torque command value recovery process, see S4).

【0037】本実施の形態においては、トルク指令値低
減・回復手段31bから出力されるトルク指令低減値T
- *を、経時変化させている。すなわち、トルク指令低減
値T - *を単調増加する時間関数で定めることによって、
基本トルク指令値T0 *からこのトルク指令低減値T- *
減じて得たトルク指令値T*が、所定低減値T’*へと漸
次低減するようにしている(図7参照)。
In the present embodiment, the torque command value is low.
Torque command reduction value T output from the reduction / restoration means 31b
- *Is changed over time. That is, torque command reduction
Value T - *By defining a monotonically increasing time function,
Basic torque command value T0 *This torque command reduction value T- *To
Torque command value T obtained by subtraction*Is the predetermined reduction value T '*Gradually
Next, the amount is reduced (see FIG. 7).

【0038】また、本実施の形態においては、トルク指
令値低減・回復手段31bから出力されるトルク指令回
復値T+ *をも同様に経時変化させており、トルク指令値
*が所定低減値T’*から基本トルク指令値T0 *へと漸
次回復するようにしている(図7参照)。
In the present embodiment, the torque command recovery value T + * output from the torque command value reduction / recovery means 31b is also changed with time, and the torque command value T * is reduced to a predetermined reduction value. The basic torque command value T 0 * is gradually recovered from T ′ * (see FIG. 7).

【0039】本実施の形態に係る電気自動車の制御装置
によれば、同期モータ10へ入力される入力電流に対応
するIqの振動が所定の振動状態にあるか否かを判定す
る振動判定手段34を備えており、このIqの振動が所
定の振動状態にあるか否かを判定することによって、車
体振動を効果的に検出することができる。
According to the control device for an electric vehicle of this embodiment, the vibration determining means for determining whether or not the vibration of I q corresponding to the input current input to the synchronous motor 10 is in a predetermined vibration state. The vehicle body vibration can be effectively detected by determining whether or not the vibration of I q is in a predetermined vibration state.

【0040】また、本実施の形態に係る電気自動車の制
御装置によれば、Iqの振動が所定の振動状態にあると
判定された場合に、トルク指令値T*を所定低減値T’*
まで低減させるトルク指令値低減・回復手段31bを備
えるため、同期モータ10の出力軸からディファレンシ
ャルギア80およびドライブシャフト90を介して駆動
輪100へと至るトルクの伝達系(ねじれ共振系)の共
振を抑制することができ、結果的に車体振動を抑制する
ことができる。
Further, according to the control device for an electric vehicle of the present embodiment, when it is determined that the vibration of I q is in the predetermined vibration state, the torque command value T * is reduced to the predetermined reduction value T ' *.
Since the torque command value reduction / restoration means 31b for reducing the torque to the drive wheels 100 from the output shaft of the synchronous motor 10 to the drive wheels 100 via the differential gear 80 and the drive shaft 90 is generated, resonance of the torque transmission system (torsion resonance system) is achieved. Therefore, the vibration of the vehicle body can be suppressed as a result.

【0041】さらに、本実施の形態に係る電気自動車の
制御装置によれば、振動判定手段34は、Iqの振幅が
連続的に所定値I0を超え、かつ、連続的に所定値I0
超えた回数が所定回数N0を超えたか否かによって、Iq
の振動が所定の振動状態に達したか否かを判定するた
め、入力電流の振動が所定の振動状態に達したか否か、
ひいては、車体振動が発生したか否かを簡易かつ正確に
検出することができる。
Further, according to the control device for an electric vehicle of the present embodiment, the vibration determining means 34 causes the vibration determining means 34 to continuously exceed the predetermined value I 0 in the amplitude of I q and continuously to the predetermined value I 0. depending on whether exceeds a predetermined number N 0 is the number of times exceeds, I q
In order to determine whether the vibration of has reached a predetermined vibration state, whether the vibration of the input current has reached a predetermined vibration state,
As a result, it is possible to easily and accurately detect whether or not the vehicle body vibration has occurred.

【0042】さらにまた、本実施の形態に係る電気自動
車の制御装置によれば、Iqの振動が所定の振動状態に
ないと判定された場合に、低減されたトルク指令値T*
を漸次回復させるトルク指令値低減・回復手段31bを
備えるため、Iqの振動が所定の振動状態にない場合、
すなわち車体振動が無視できる程度のレベルに達した場
合には、速やかに同期モータ10の出力トルクを増加さ
せることができる。従って、車体振動を抑制しながら高
い加速性能を発揮することができる。
Furthermore, according to the control device for an electric vehicle of the present embodiment, when it is determined that the vibration of I q is not in the predetermined vibration state, the reduced torque command value T *.
To provide a progressively recovered to the torque command value reduced and recovery means 31b, when the vibration of I q is not in the predetermined vibration state,
That is, when the vehicle body vibration reaches a level that can be ignored, the output torque of the synchronous motor 10 can be promptly increased. Therefore, high acceleration performance can be exhibited while suppressing vehicle body vibration.

【0043】なお、本実施の形態に係る電気自動車の制
御装置においては、指令値低減手段および指令値回復手
段として、トルク指令値低減・回復手段31bを採用し
たが、これに限定されるものではなく、指令値低減手段
として電流指令値低減手段を、指令値回復手段として電
流指令値回復手段を採用することもできる。
In the control apparatus for the electric vehicle according to the present embodiment, the torque command value reducing / recovering means 31b is used as the command value reducing means and the command value recovering means, but the invention is not limited to this. Alternatively, the current command value reducing means may be adopted as the command value reducing means, and the current command value restoring means may be adopted as the command value restoring means.

【0044】[0044]

【発明の効果】請求項1記載の発明によれば、電動機へ
入力される入力電流の振動状態の変化を検出することに
よって、車体振動を効果的に検出することができる。ま
た、電動機へ入力される入力電流の振動が所定の振動状
態にあると判定された場合に、トルク指令値または電流
指令値を所定値まで低減させる指令値低減・回復手段を
備えるため、電動機の出力軸から駆動輪へと至るトルク
の伝達系(ねじれ共振系)の共振を抑制することがで
き、結果的に車体振動を効果的に抑制することができ
る。
According to the first aspect of the present invention, the vehicle body vibration can be effectively detected by detecting the change in the vibration state of the input current input to the electric motor. Further, when it is determined that the vibration of the input current input to the electric motor is in a predetermined vibration state, a command value reduction / recovery unit that reduces the torque command value or the current command value to the predetermined value is provided, so that the electric motor Resonance of the torque transmission system (torsion resonance system) from the output shaft to the drive wheels can be suppressed, and as a result, vehicle body vibration can be effectively suppressed.

【0045】請求項2記載の発明によれば、請求項1記
載の発明の効果を奏するのは勿論のこと、入力電流の振
動が所定の振動状態にあるか否か、ひいては、車体振動
が発生したか否かを簡易かつ正確に検出することができ
る。
According to the second aspect of the invention, not only the effect of the first aspect of the invention is exhibited, but also whether or not the vibration of the input current is in a predetermined vibration state, and consequently, the vibration of the vehicle body is generated. Whether or not it can be detected easily and accurately.

【0046】請求項3記載の発明によれば、請求項1ま
たは2記載の発明の効果を奏するのは勿論のこと、入力
電流の振動が所定の振動状態にない場合、すなわち車体
振動が無視できる程度のレベルに達した場合には、速や
かに電動機の出力トルクを増加させることができる。従
って、車体振動を抑制しながら高い加速性能を発揮する
ことができる。
According to the invention described in claim 3, not only the effect of the invention described in claim 1 or 2 is obtained, but when the vibration of the input current is not in a predetermined vibration state, that is, the vibration of the vehicle body can be ignored. When the level reaches a certain level, the output torque of the electric motor can be promptly increased. Therefore, high acceleration performance can be exhibited while suppressing vehicle body vibration.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明の実施の形態に係る電気自動車のシステ
ム構成を説明するための概略図である。
FIG. 1 is a schematic diagram for explaining a system configuration of an electric vehicle according to an embodiment of the present invention.

【図2】図1に示した電気自動車の制御装置の構成を説
明するためのブロック図である。
FIG. 2 is a block diagram for explaining a configuration of a control device for the electric vehicle shown in FIG.

【図3】図2に示した電流制御手段の構成を説明するた
めのブロック図である。
FIG. 3 is a block diagram for explaining the configuration of a current control unit shown in FIG.

【図4】図2に示したトルク指令値演算手段の構成を説
明するためのブロック図である。
FIG. 4 is a block diagram for explaining a configuration of a torque command value calculation means shown in FIG.

【図5】本発明の実施の形態に係る電気自動車の制御装
置を用いて車体振動抑制制御を行う際のフローチャート
である。
FIG. 5 is a flowchart when performing vehicle body vibration suppression control using the control device for the electric vehicle according to the embodiment of the present invention.

【図6】図6に示した振動判定工程における振動判定方
法を説明するための説明図である。
6 is an explanatory diagram for explaining a vibration determination method in the vibration determination process shown in FIG.

【図7】本発明の実施の形態に係る電気自動車の制御装
置を用いて車体振動抑制制御を行った場合におけるトル
ク指令値の時間履歴を表したグラフである。
FIG. 7 is a graph showing a time history of torque command values when vehicle body vibration suppression control is performed using the control device for an electric vehicle according to the embodiment of the present invention.

【符号の説明】[Explanation of symbols]

10 三相交流同期モータ 20 バッテリ 30 制御装置 31 トルク指令値演算手段 31a 基本トルク指令値演算手段 31b トルク指令値低減・回復手段 31c 加減算器 32 電流指令値演算手段 33 電流制御手段 33a dq軸電流制御手段 33b 2/3相変換手段 33c PWM信号発生手段 33d 3/2相変換手段 34 振動判定手段 40 インバータ 50 レゾルバ 60 電流検出手段 70 アクセル操作量検出器 80 ディファレンシャルギア 90 ドライブシャフト 100 駆動輪 S1 入力電流検出工程 S2 振動判定工程 S3 トルク指令値低減工程 S4 トルク指令値回復工程 10 Three-phase AC synchronous motor 20 battery 30 control device 31 Torque command value calculation means 31a Basic torque command value calculation means 31b Torque command value reduction / recovery means 31c adder / subtractor 32 Current command value calculation means 33 Current control means 33a dq axis current control means 33b 2/3 phase conversion means 33c PWM signal generating means 33d 3/2 phase conversion means 34 Vibration determination means 40 inverter 50 resolver 60 Current detection means 70 Accelerator manipulated variable detector 80 differential gear 90 drive shaft 100 drive wheels S1 input current detection process S2 Vibration judgment process S3 Torque command value reduction process S4 Torque command value recovery process

───────────────────────────────────────────────────── フロントページの続き Fターム(参考) 5H115 PA01 PA05 PC06 PG04 PI16 PU10 PU25 PU26 PV09 PV22 QE01 QE08 QN06 QN09 5H576 AA15 BB04 CC02 DD07 EE01 EE11 EE19 FF01 FF02 GG02 GG04 HA01 HB01 LL22    ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 5H115 PA01 PA05 PC06 PG04 PI16                       PU10 PU25 PU26 PV09 PV22                       QE01 QE08 QN06 QN09                 5H576 AA15 BB04 CC02 DD07 EE01                       EE11 EE19 FF01 FF02 GG02                       GG04 HA01 HB01 LL22

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】アクセル操作量に応じて所定のトルク指令
値の演算および出力を行うトルク指令値演算手段と、前
記トルク指令値に応じて所定の電流指令値の演算および
出力を行う電流指令値演算手段と、電動機へ入力される
入力電流を検出する電流検出手段と、前記電流指令値に
応じた電流を前記電動機に出力することにより駆動手段
を介して前記電動機を駆動制御する駆動制御手段を備え
る電気自動車の制御装置において、 前記入力電流の振動が所定の振動状態にあるか否かを判
定する振動判定手段と、 前記入力電流の振動が所定の振動状態にあると判定され
た場合に、トルク指令値または電流指令値を所定値まで
低減させる指令値低減手段とを備えることを特徴とする
電気自動車の制御装置。
1. A torque command value calculating means for calculating and outputting a predetermined torque command value according to an accelerator operation amount, and a current command value for calculating and outputting a predetermined current command value according to the torque command value. Arithmetic means, current detection means for detecting an input current input to the electric motor, and drive control means for driving and controlling the electric motor via the driving means by outputting a current according to the current command value to the electric motor. In a control device for an electric vehicle comprising, a vibration determination means for determining whether the vibration of the input current is in a predetermined vibration state, and when the vibration of the input current is determined to be in a predetermined vibration state, A control device for an electric vehicle, comprising: a command value reducing means for reducing a torque command value or a current command value to a predetermined value.
【請求項2】前記振動判定手段は、 前記入力電流の振幅が連続的に所定値を超え、かつ、前
記所定値を連続的に超えた回数が所定回数を超えたか否
かによって、前記入力電流の振動が所定の振動状態にあ
るか否かを判定することを特徴とする請求項1記載の電
気自動車の制御装置。
2. The vibration determining means determines the input current depending on whether the amplitude of the input current continuously exceeds a predetermined value and the number of times the predetermined value continuously exceeds the predetermined value. The control device for an electric vehicle according to claim 1, wherein it is determined whether or not the vibration of the electric vehicle is in a predetermined vibration state.
【請求項3】前記入力電流の振動が所定の振動状態にな
いと判定された場合に、前記指令値低減手段により低減
されたトルク指令値または電流指令値を漸次回復させる
指令値回復手段を備えることを特徴とする請求項1また
は2記載の電気自動車の制御装置。
3. A command value recovery means for gradually recovering the torque command value or the current command value reduced by the command value reducing means when it is determined that the vibration of the input current is not in a predetermined vibration state. The control device for an electric vehicle according to claim 1 or 2, characterized in that.
JP2001289615A 2001-09-21 2001-09-21 Electric vehicle control device Expired - Fee Related JP4838462B2 (en)

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