JP3477299B2 - Vehicle speed control method for automatic vehicle driving system - Google Patents

Vehicle speed control method for automatic vehicle driving system

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Publication number
JP3477299B2
JP3477299B2 JP31613095A JP31613095A JP3477299B2 JP 3477299 B2 JP3477299 B2 JP 3477299B2 JP 31613095 A JP31613095 A JP 31613095A JP 31613095 A JP31613095 A JP 31613095A JP 3477299 B2 JP3477299 B2 JP 3477299B2
Authority
JP
Japan
Prior art keywords
vehicle speed
deviation
vehicle
term
control method
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
JP31613095A
Other languages
Japanese (ja)
Other versions
JPH09133610A (en
Inventor
隆夫 小西
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.)
Horiba Ltd
Original Assignee
Horiba 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 Horiba Ltd filed Critical Horiba Ltd
Priority to JP31613095A priority Critical patent/JP3477299B2/en
Publication of JPH09133610A publication Critical patent/JPH09133610A/en
Application granted granted Critical
Publication of JP3477299B2 publication Critical patent/JP3477299B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Description

【発明の詳細な説明】 【0001】 【発明の属する技術分野】この発明は、シャシダイナモ
メータの回転ドラム上に駆動輪を載せて自動車などの車
両を走行させて、車両の動的な走行性能試験を室内で行
う実車走行シミュレート運転において、車両を自動運転
する車両自動運転装置における車速の制御方法に関す
る。 【0002】 【従来の技術】従来より、車両の動的な走行性能試験の
ため、シャシダイナモメータによって実車走行シミュレ
ート運転が行われており、近時、この実車走行シミュレ
ート運転に、油圧や空気圧あるいはDCモータなどによ
って複数のアクチュエータを個々に駆動し、このアクチ
ュエータによってアクセルペダル、ブレーキペダル、ク
ラッチペダルなどの踏込み操作や、シフトレバーの切換
えを行えるようにした車両自動運転装置が用いられるよ
うになってきている。 【0003】ところで、上記実車走行シミュレート運転
においては、予め決められた走行パターンで車両を走行
させる必要があり、例えばスロットルサーボ系(または
ブレーキサーボ系)を制御するのに、従来においては、
図3に示すように、目標速度VNOM とシャシダイナモメ
ータ1における車両の実際の速度(以下、実車速とい
う)VACT との差(車速偏差)をPI(比例−積分)制
御系2に入力し、スロットルサーボ系(またはブレーキ
サーボ系)3の開度をフィードバック制御するようにし
ていた。なお、この図において、4は掛算器、5は積分
器、6はエンジン、7は動力伝達系としてのパワートレ
イン、8,9は突き合わせ点である。 【0004】 【発明が解決しようとする課題】しかしながら、上記車
両自動運転装置の車速制御方法(以下、車速制御方法と
いう)によれば、車両の能力以上の加速の目標速度が与
えられたとき、実車速VACT が目標車速VNOM に追随で
きずに遅れ、そのため、I(積分)項出力値が大きな値
となる。そして、目標車速VNOM の加速度が小さくな
り、実車速VACT は目標車速VNOM に追いつくが、前記
I項が既に大きくなっているため、実車速VACT が目標
車速VNOM を大きく上回り、大きなオーバーシュートが
生じ、速度追従性がよくないという欠点がある。 【0005】この発明は、上述の事柄に留意してなされ
たもので、その目的は、車両にその能力以上の加速の目
標車速を与えてもオーバーシュートが生じないように
し、これにより、良好な速度追従性が得られるようにし
た車速制御方法を提供することである。 【0006】 【課題を解決するための手段】上記目的を達成するた
め、この発明では、目標速度とシャシダイナモメータに
おける実車速との差をPI(比例−積分)制御系に入力
し、スロットルサーボ系またはブレーキサーボ系の開度
をフィードバック制御する車両自動運転装置において、
車速偏差がI(積分)項減少操作開始偏差より小さくな
り、かつ、チェック時間だけ前の車速偏差がチェック偏
差より大きいときにI項減少操作を開始するようにした
ことを特徴としている。 【0007】上記車速制御方法によれば、車両にその能
力以上の加速の目標車速を与えられたときには、I項減
少操作を開始してI項出力値が小さくなるようにしてい
るので、オーバーシュートが生じず、良好な速度追従性
が得られる。 【0008】 【発明の実施の形態】以下、この発明の詳細を、図を参
照しながら説明する。 【0009】図1および図2は、この発明の第1の実施
の形態における車速制御方法を説明するための図であ
る。そして、図1において、図3に示した符合と同一の
ものは同一物を示している。この発明の車速制御方法
は、上述した従来のそれと大きく異なる点は、I項操作
判断部10を付加し、車速偏差がI項減少操作開始偏差
より小さくなり、かつ、チェック時間だけ前の車速偏差
がチェック偏差より大きいときにI項減少操作を開始す
るようにしたことである。これを、図2をも参照しなが
ら詳細に説明する。 【0010】今、目標車速VNOM が、図2(A)におい
て一点鎖線で示すように変化し、このときの実車速V
ACT が実線で示すようであったとする。そして、チェッ
ク開始時刻をtCBとし、チェック終了時刻をtCEとす
る。チェック時間の長さ(=tCE−tCB)は、例えば1
秒である。 【0011】そして、車速偏差Verr (=VNOM −V
ACT )が基準となるI項減少操作開始偏差aより小さく
なり、かつ、チェック開始時間tCBにおける車速偏差V
err が基準となるチェック偏差bより大きいとき、I項
減少操作を行う。ここで、前記a,bは車種によって適
宜設定される値である。このときのI項減少量Zは、前
記チェック偏差bに所定の定数kを乗じたもの、すなわ
ち、 Z=b×k となる。なお、ここで、kは車種によって定められる定
数である。 【0012】上述のようにI項減少操作を行った場合、
実車速VACT は、図2(A)において点線11で示すよ
うに制御され、目標車速VNOM に追随することができ
る。これに対して、I項減少操作を行わない場合には、
実車速VACT は、図2(A)において実線12に示すよ
うになり、目標車速VNOM から大きく離れ、オーバーシ
ュートが生ずる。 【0013】次に、上記I項減少操作を解除する(やめ
る)場合を、図2(B)を参照しながら説明する。今、
I項減少操作の開始時刻をtIBとする。I項減少操作を
解除する時期は、 I項減少操作開始時間tIBより所定の時間Tを経過
したときにおける実車速VACT が目標車速VNOM よりも
小さいとき、 車速偏差Verr の変化率が所定の値以上であり、か
つ、車速偏差Verr が所定の終了偏差cより大きくなっ
たとき、のいずれかである。ここで、前記所定の時間
T、所定の値および所定の終了偏差cは、車種によって
定められる値である。 【0014】すなわち、図2(B)において、符号1
3,14で示すように、I項減少操作を開始した時点t
IBより所定の時間Tを経過したときの実車速VACT が目
標車速VNOM よりも小さいときには、I項減少操作の効
果があったものとしてI項減少操作を解除する。そし
て、前記符号13で示すものは、I項減少操作による減
少量Zが大きい場合であり、符号14で示すものは、減
少量Zがちょうど適切な場合である。 【0015】そして、I項減少操作による減少量Zが少
ないと、図2(B)において、符号15で示すように、
前記所定の時間Tを経過したときの実車速VACT が目標
車速VNOM よりも大きくなるが、このときは、車速偏差
err の変化率が所定の値以上であり、かつ、車速偏差
err が所定の終了偏差cより大きくなったときに、I
項減少操作を解除する。 【0016】この発明の車速制御方法においては、上述
のような条件にしたがってI項減少操作をオン(実行)
またはオフ(解除)することにより、オーバーシュート
のない良好な車速追従性が得られる。 【0017】 【発明の効果】以上説明したように、この発明によれ
ば、車両にその能力以上の加速の目標車速が与えられて
もオーバーシュートが生ずることがなく、したがって、
従来の車速制御方法に比べて、速度追従性が大幅に向上
するに至った。
Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dynamic driving performance of a vehicle such as an automobile by driving a vehicle with driving wheels mounted on a rotating drum of a chassis dynamometer. The present invention relates to a method for controlling a vehicle speed in a vehicle automatic driving device that automatically drives a vehicle in a simulated driving operation of a real vehicle in which a test is performed indoors. 2. Description of the Related Art Conventionally, a chassis dynamometer has been used to simulate actual running of a vehicle for a dynamic running performance test of a vehicle. A plurality of actuators are individually driven by a pneumatic or DC motor, and an automatic vehicle driving device is used in which an accelerator pedal, a brake pedal, a clutch pedal, and the like can be depressed and a shift lever can be switched by the actuator. It has become to. [0003] In the actual vehicle running simulation driving, it is necessary to drive the vehicle in a predetermined running pattern. For example, in order to control a throttle servo system (or a brake servo system), conventionally,
As shown in FIG. 3, a difference (vehicle speed deviation) between a target speed V NOM and an actual speed (hereinafter referred to as an actual vehicle speed) V ACT of the vehicle in the chassis dynamometer 1 is input to a PI (proportional-integral) control system 2. In addition, the opening degree of the throttle servo system (or brake servo system) 3 is feedback-controlled. In this figure, 4 is a multiplier, 5 is an integrator, 6 is an engine, 7 is a power train as a power transmission system, and 8 and 9 are butting points. [0004] However, according to the vehicle speed control method (hereinafter referred to as a vehicle speed control method) of the automatic vehicle driving system, when a target speed for acceleration exceeding the capability of the vehicle is given, The actual vehicle speed V ACT is not able to follow the target vehicle speed V NOM and is delayed, so that the I (integral) term output value becomes large. Then, the acceleration of the target vehicle speed V NOM decreases, and the actual vehicle speed V ACT catches up with the target vehicle speed V NOM , but since the term I has already been increased, the actual vehicle speed V ACT greatly exceeds the target vehicle speed V NOM and becomes large. There is a drawback that overshoot occurs and the speed following performance is poor. SUMMARY OF THE INVENTION The present invention has been made in consideration of the above-mentioned circumstances, and an object of the present invention is to prevent overshoot from occurring even when a vehicle is provided with a target vehicle speed of acceleration exceeding its ability, thereby achieving a good performance. An object of the present invention is to provide a vehicle speed control method capable of achieving speed following. In order to achieve the above object, according to the present invention, a difference between a target speed and an actual vehicle speed in a chassis dynamometer is input to a PI (proportional-integral) control system, and a throttle servo is provided. In an automatic vehicle driving device that feedback controls the opening of the system or brake servo system,
The I-term reduction operation is started when the vehicle speed deviation is smaller than the I (integral) term reduction operation start deviation and the vehicle speed deviation before the check time is larger than the check deviation. According to the above-mentioned vehicle speed control method, when the vehicle is provided with a target vehicle speed for acceleration exceeding its capability, the I-term decreasing operation is started so that the I-term output value is reduced. Does not occur, and good speed followability is obtained. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to the drawings. FIG. 1 and FIG. 2 are diagrams for explaining a vehicle speed control method according to the first embodiment of the present invention. In FIG. 1, the same components as those shown in FIG. 3 indicate the same components. The vehicle speed control method of the present invention is significantly different from the above-described conventional one in that an I-term operation judging unit 10 is added, the vehicle speed deviation becomes smaller than the I-term decrease operation start deviation, and the vehicle speed deviation just before the check time. Is larger than the check deviation, the I-term decreasing operation is started. This will be described in detail with reference to FIG. Now, the target vehicle speed V NOM changes as shown by the one-dot chain line in FIG.
Suppose ACT was as shown by the solid line. The check start time is t CB and the check end time is t CE . The length of the check time (= t CE −t CB ) is, for example, 1
Seconds. The vehicle speed deviation V err (= V NOM −V
ACT ) is smaller than the reference I term decrease operation start deviation a and the vehicle speed deviation V at the check start time t CB .
When err is larger than the reference check deviation b, an I-term decreasing operation is performed. Here, a and b are values appropriately set depending on the vehicle type. The I term decrease amount Z at this time is obtained by multiplying the check deviation b by a predetermined constant k, that is, Z = b × k. Here, k is a constant determined by the vehicle type. When the I-term decreasing operation is performed as described above,
The actual vehicle speed V ACT is controlled as shown by a dotted line 11 in FIG. 2A, and can follow the target vehicle speed V NOM . On the other hand, when the I term reduction operation is not performed,
The actual vehicle speed V ACT is as shown by a solid line 12 in FIG. 2 (A), greatly deviates from the target vehicle speed V NOM , and an overshoot occurs. Next, how to cancel (stop) the I term reducing operation will be described with reference to FIG. 2 (B). now,
The start time of the I-term decreasing operation is defined as t IB . When the actual vehicle speed V ACT after the predetermined time T has elapsed from the I-term decreasing operation start time t IB is lower than the target vehicle speed V NOM , the rate of change of the vehicle speed deviation V err is canceled when the I-term decreasing operation is canceled. Either the value is equal to or more than a predetermined value and the vehicle speed deviation V err becomes larger than a predetermined end deviation c. Here, the predetermined time T, the predetermined value, and the predetermined end deviation c are values determined depending on the vehicle type. That is, in FIG.
As shown by 3 and 14, the time t at which the I-term reduction operation is started
When the actual vehicle speed V ACT when a predetermined time T has elapsed from IB is lower than the target vehicle speed V NOM , the I-term decreasing operation is canceled assuming that the effect of the I-term decreasing operation has been obtained. The reference numeral 13 indicates a case where the reduction amount Z due to the I-term reduction operation is large, and the reference numeral 14 indicates a case where the reduction amount Z is just appropriate. If the amount of reduction Z due to the I-term reduction operation is small, as shown by reference numeral 15 in FIG.
The actual vehicle speed V ACT when the predetermined time T has elapsed becomes greater than the target vehicle speed V NOM , but at this time, the rate of change of the vehicle speed deviation V err is equal to or greater than a predetermined value, and the vehicle speed deviation V err Is larger than a predetermined end deviation c, I
Cancel the term reduction operation. In the vehicle speed control method according to the present invention, the I-term reduction operation is turned on (executed) in accordance with the above conditions.
Alternatively, by turning off (cancelling), good vehicle speed following performance without overshoot can be obtained. As described above, according to the present invention, overshoot does not occur even if a target vehicle speed for acceleration exceeding its ability is given to the vehicle.
Compared with the conventional vehicle speed control method, the speed following ability has been greatly improved.

【図面の簡単な説明】 【図1】この発明の車速制御方法を実施するための制御
系の一例を示すブロック図である。 【図2】前記車速制御方法を説明するための図である。 【図3】従来の車速制御方法を実施するための制御系を
示すブロック図である。 【符号の説明】 2…PI制御系、10…I項操作判断機能、VNOM …目
標速度、VACT …実車速、Verr …車速偏差、a…I項
減少操作開始偏差、b…チェック偏差。
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an example of a control system for implementing a vehicle speed control method according to the present invention. FIG. 2 is a diagram for explaining the vehicle speed control method. FIG. 3 is a block diagram showing a control system for implementing a conventional vehicle speed control method. [Description of Signs] 2 ... PI control system, 10 ... I-term operation determination function, V NOM ... Target speed, V ACT ... Real vehicle speed, V err ... Vehicle speed deviation, a ... I-term decrease operation start deviation, b ... Check deviation .

───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7,DB名) G01M 17/007 B60K 31/00 ──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. 7 , DB name) G01M 17/007 B60K 31/00

Claims (1)

(57)【特許請求の範囲】 【請求項1】 目標速度とシャシダイナモメータにおけ
る車両の実際の速度との差をPI(比例−積分)制御系
に入力し、スロットルサーボ系またはブレーキサーボ系
の開度をフィードバック制御する車両自動運転装置にお
いて、車速偏差がI(積分)項減少操作開始偏差より小
さくなり、かつ、チェック時間だけ前の車速偏差がチェ
ック偏差より大きいときにI項減少操作を開始するよう
にしたことを特徴とする車両自動運転装置の車速制御方
法。
(57) [Claims 1] A difference between a target speed and an actual speed of a vehicle in a chassis dynamometer is input to a PI (proportional-integral) control system, and a throttle servo system or a brake servo system is input. In an automatic vehicle driving apparatus that performs feedback control of an opening, an I-term reduction operation is started when a vehicle speed deviation is smaller than an I (integral) term reduction operation start deviation and a vehicle speed deviation before the check time is larger than a check deviation. A vehicle speed control method for an automatic vehicle driving device, comprising:
JP31613095A 1995-11-09 1995-11-09 Vehicle speed control method for automatic vehicle driving system Expired - Fee Related JP3477299B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP31613095A JP3477299B2 (en) 1995-11-09 1995-11-09 Vehicle speed control method for automatic vehicle driving system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP31613095A JP3477299B2 (en) 1995-11-09 1995-11-09 Vehicle speed control method for automatic vehicle driving system

Publications (2)

Publication Number Publication Date
JPH09133610A JPH09133610A (en) 1997-05-20
JP3477299B2 true JP3477299B2 (en) 2003-12-10

Family

ID=18073590

Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Status (1)

Country Link
JP (1) JP3477299B2 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2610606A3 (en) 2011-12-26 2017-11-01 Horiba, Ltd. Speed control apparatus and program for speed control apparatus; and automatic vehicle driving apparatus, engine dynamo control apparatus, and control programs used for respective apparatuses
JP5870005B2 (en) 2012-11-08 2016-02-24 株式会社堀場製作所 Analysis system, information processing apparatus, and program
KR20170010124A (en) 2015-07-15 2017-01-26 현대자동차주식회사 Control method for creep driving of vehicle

Also Published As

Publication number Publication date
JPH09133610A (en) 1997-05-20

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