JPH03195973A - Car body speed estimating apparatus - Google Patents

Car body speed estimating apparatus

Info

Publication number
JPH03195973A
JPH03195973A JP33538089A JP33538089A JPH03195973A JP H03195973 A JPH03195973 A JP H03195973A JP 33538089 A JP33538089 A JP 33538089A JP 33538089 A JP33538089 A JP 33538089A JP H03195973 A JPH03195973 A JP H03195973A
Authority
JP
Japan
Prior art keywords
car body
speed
output
body speed
accerelation
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.)
Pending
Application number
JP33538089A
Other languages
Japanese (ja)
Inventor
Masahiro Miyamori
雅裕 宮森
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.)
NEC Home Electronics Ltd
NEC Corp
Original Assignee
NEC Home Electronics Ltd
Nippon Electric Co 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 NEC Home Electronics Ltd, Nippon Electric Co Ltd filed Critical NEC Home Electronics Ltd
Priority to JP33538089A priority Critical patent/JPH03195973A/en
Publication of JPH03195973A publication Critical patent/JPH03195973A/en
Pending legal-status Critical Current

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Abstract

PURPOSE:To obtain an accurate car body speed even at a low accerelation by providing car body accerelation detecting sensor means, integrator means for estimating a car body speed from the output of the sensor means, car wheel speed detecting sensor means and correction means for correcting the output of the integrator means by the output of the car wheel speed sensor means. CONSTITUTION:A car body speed Vg is obtained by integrating an accerelation (g) detected by an accerelation sensor in an integrator 2 to output the car body speed Vg to a correcting circuit 3. After counted by a counter 5, a car wheel speed Vw detected by a car wheel sensor 4 is outputted to the circuit 3. The circuit 3 holds the car body speed Vg when a detected accerelation ¦g¦ equal to or below a set value + or - gm continues over a prescribed time and begins a correction at a time point when the detected accerelation ¦g¦ exceeds + or - gm to output the corrected car body speed V. Thus, since the car body speed is corrected by car wheel speed data to be outputted when the accerelation decreases, the accurate car body speed can be obtained.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明はアンチロックブレーキ制御、トラクション制御
等のためのデータを得るためる、車体速度を推定する四
輪駆動車の車体速度推定装置に関し、特に低加速度のと
きの誤差を補正する車体速度推定装置に係る。
[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a vehicle speed estimation device for a four-wheel drive vehicle that estimates vehicle speed to obtain data for anti-lock brake control, traction control, etc. The present invention relates to a vehicle speed estimation device that corrects errors at low acceleration.

〔従来技術〕[Prior art]

アンチロックブレーキ制御やトラクション制御等のため
には車体速データを得る必要がある。この車体速度を得
るものとしては、例えば第4図及び第5図に示すものが
ある。すなわち、第4図のものは回転速センサ等で求め
た車輪の回転速度VWから車体速度Vを求めるものであ
り、第5図のものは車体の加速度gνを常時測定し、こ
の加速度gvの値を積分することにより車体速度Vを求
めるものである。なお、kは定数である。
It is necessary to obtain vehicle speed data for anti-lock brake control, traction control, etc. Examples of methods for obtaining this vehicle speed are shown in FIGS. 4 and 5. That is, the one in Fig. 4 calculates the vehicle body speed V from the rotational speed VW of the wheel determined by a rotational speed sensor, etc., and the one in Fig. 5 constantly measures the acceleration gv of the car body and calculates the value of this acceleration gv. The vehicle body speed V is determined by integrating . Note that k is a constant.

後者のものは、加速度センサからの出力を積分器で積分
計算することにより車体速度を求めるようになっている
The latter calculates the vehicle speed by integrally calculating the output from the acceleration sensor using an integrator.

〔発明が解決しようとする課題〕[Problem to be solved by the invention]

ところで、前述した2との車体速検出手法のうち、前者
のものは回転速センサを用いるため低速時はネn度が良
いが、高速時には回転速センサの分解能が悪(なり精度
が落ちるという課題がある。
By the way, among the vehicle speed detection methods mentioned in 2 above, the former uses a rotation speed sensor, so it has good accuracy at low speeds, but at high speeds, the resolution of the rotation speed sensor is poor (and the accuracy decreases). There is.

また、後者のものはゆるやかに加減速が行われた場合に
は発生する加速度は非常に小さくなるので、加速度セン
サにより検出される加速度gvは非常に小さい、このた
め、この小さな加速度gvを積分器により積分して車体
速度を求めるとすると誤差が累積されるという課題があ
る。
In addition, in the case of the latter, when acceleration/deceleration is performed slowly, the generated acceleration becomes very small, so the acceleration gv detected by the acceleration sensor is very small. If the vehicle speed is determined by integrating the equation, there is a problem in that errors accumulate.

本発明は上記実情に鑑みて創案されたものであって、小
さな加速度であっても正確な車体速度を得ることができ
る車体速度推定装置を提供しようとするものである。
The present invention was devised in view of the above-mentioned circumstances, and it is an object of the present invention to provide a vehicle speed estimating device that can obtain accurate vehicle speed even with small accelerations.

〔課題を解決するための手段〕[Means to solve the problem]

本発明は上記目的を達成するために、車体の加速度を検
出する加速度センサと、加速度センサからの出力を積分
して車体速度をflI定する積分器と、車輪の速度を検
出する車輪速センサと、上記加速度センサにより検出さ
れる加速度が一定値以下のときは積分器からの出力を車
輪速センサからの出力により補正する補正手段とを備え
て構成された。
In order to achieve the above object, the present invention includes an acceleration sensor that detects the acceleration of a vehicle body, an integrator that integrates the output from the acceleration sensor to determine the vehicle speed, and a wheel speed sensor that detects the speed of the wheels. and a correction means for correcting the output from the integrator with the output from the wheel speed sensor when the acceleration detected by the acceleration sensor is below a certain value.

〔作用〕[Effect]

本発明の構成によれば、加速度センサにより検出された
加速度は積分器に出力されて積分され、補正手段に出力
される一方、車輪速センサにより検出された車輪速度は
補正手段に出力され、補正手段では加速度が一定値以上
のときは積分器からのデータを補正せずに出力し、一定
値以下のときは車輪速度により補正して出力する。
According to the configuration of the present invention, the acceleration detected by the acceleration sensor is outputted to the integrator, integrated, and outputted to the correction means, while the wheel speed detected by the wheel speed sensor is outputted to the correction means, and corrected. The means outputs the data from the integrator without correction when the acceleration is above a certain value, and outputs the data after being corrected based on the wheel speed when it is below a certain value.

〔実施例〕〔Example〕

本発明を図面に示された一実施例に基づいて説明する。 The present invention will be explained based on an embodiment shown in the drawings.

第1図は回路構成を示すブロック図、第2図は車体速度
補正のタイムチャート、第3図は第2図の部分拡大図で
ある。
FIG. 1 is a block diagram showing the circuit configuration, FIG. 2 is a time chart of vehicle speed correction, and FIG. 3 is a partially enlarged view of FIG. 2.

車両の加速度を検出する加速度センサlは積分器2に接
続されており、加速度センサ1で検出された加速度デー
タは積分器2で積分されて車体速度が推定される。この
積分器2は補正回路3に接続されており、補正回路3か
ら車体速度■が出力される。
An acceleration sensor l that detects the acceleration of the vehicle is connected to an integrator 2, and the acceleration data detected by the acceleration sensor 1 is integrated by the integrator 2 to estimate the vehicle speed. This integrator 2 is connected to a correction circuit 3, and the correction circuit 3 outputs the vehicle speed ■.

また、車輪の速度を検出する車輪速センサ4はカウンタ
5に接続されており、カウンタ5が上記補正回路3に接
続されている。なお、φはカウンタ5に入力する発振器
からの信号である。
Further, a wheel speed sensor 4 that detects the speed of a wheel is connected to a counter 5, and the counter 5 is connected to the correction circuit 3. Note that φ is a signal from an oscillator that is input to the counter 5.

上記補正回路3では積分器2及びカンウタ5からのデー
タにより車体速度Vを求めるが、検出される加速度gが
設定値上gm以上のときは積分器2からのデータをその
まま用いて車体速度■を出力し、設定値±gl11以下
の小さい加速度のときは積分器2からのデータをカウン
タ5からの車輪速データVwにより順次補正した後車体
速度Vとして出力する。
The correction circuit 3 calculates the vehicle speed V using the data from the integrator 2 and counter 5, but when the detected acceleration g is higher than the set value gm, the data from the integrator 2 is used as is to calculate the vehicle speed V. When the acceleration is small below the set value ±gl11, the data from the integrator 2 is sequentially corrected by the wheel speed data Vw from the counter 5 and output as the vehicle body speed V.

次に、第2図及び第3図に示すタイムチャートに基づい
て作用を説明する。
Next, the operation will be explained based on the time charts shown in FIGS. 2 and 3.

加速度センサ1により検出された加速度gは積分器2に
出力されて積分され、車体速度V(=Vg)が求められ
、この車体速度V (=Vg)が補正回路3に出力され
る。一方、車輪速センサ4により検出された車輪速度■
−はカウンタ5によりカウントされた後、補正回路3に
出力される。補正回路3では設定値上gs以下の検出加
速度1g1が一定時間【1以上続くと、そのときの車体
速度V(−Vg)をホールドして車体速度Vghを保持
する(第2図(1)の時点)。このホールドの期間中は
車輪速センサ4からの検出車輪速度V−か一 ’1体速fljV (= Vw ) = 1 / T 
Sr、Vwdtを演算して出力している。そして、加速
度gが設定値1gm以上になった時点(第2図(2)の
時点)で補正を開始する。この補正に際して一度で補正
をすると歪みを生ずる(第3図(イ)(ロ)参照)ので
複数回に分けて補正をする。すなわち、設定値1gm以
上になったときは、 補正量τ=Vw  Vgh を算出し、 Δτ=τ/N rn=τn −1+△τ とし、 車体速度V=Vg±τn として順次補正する。そして、補正された車体速度Vが
補正回路3から出力される。
The acceleration g detected by the acceleration sensor 1 is output to an integrator 2 and integrated to determine the vehicle speed V (=Vg), and this vehicle speed V (=Vg) is output to the correction circuit 3. On the other hand, the wheel speed detected by the wheel speed sensor 4
- is counted by the counter 5 and then output to the correction circuit 3. In the correction circuit 3, when the detected acceleration 1g1 that is above the set value gs or less continues for a certain period of time [1 or more], the current vehicle speed V (-Vg) is held and the vehicle speed Vgh is maintained (see Fig. 2 (1)). time). During this hold period, the wheel speed detected by the wheel speed sensor 4 is V-1' body speed fljV (=Vw) = 1/T.
Sr and Vwdt are calculated and output. Then, the correction is started when the acceleration g becomes equal to or higher than the set value of 1 gm (the time shown in FIG. 2 (2)). If this correction is performed at once, distortion will occur (see FIGS. 3(a) and 3(b)), so the correction is performed in multiple steps. That is, when the set value exceeds 1 gm, the correction amount τ=Vw Vgh is calculated, Δτ=τ/N rn=τn −1+Δτ, and the vehicle speed is sequentially corrected as V=Vg±τn. Then, the corrected vehicle speed V is output from the correction circuit 3.

〔発明の効果〕〔Effect of the invention〕

以上の説明から明らかなように、本発明によれば、加速
度を積分して車体速度を求めるものであるが、加速度が
小さくなると、車輪速データにより車体速度を補正して
出力するので、精度の高い車体速度を求めることができ
る。
As is clear from the above explanation, according to the present invention, the vehicle speed is determined by integrating the acceleration. However, when the acceleration becomes small, the vehicle speed is corrected and output using the wheel speed data, so the accuracy is reduced. A high vehicle speed can be obtained.

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

図面は本発明に閏する車体速度推定装置の一実施例を示
し、第1図は回路構成を示すブロック図、第2図は車体
速度補正のタイムチャー1・、第3図は第2図の部分拡
大図、第4図及び第5図はそれぞれ従来例を示す車体速
度検出の説明図である。 (主要部分を示す図面の簡単な説明) 1・・加速度センサ   2・・積分器3・・補正回路
     4・・車輪速センサ5・・カウンタ 第1 第4
The drawings show an embodiment of the vehicle speed estimating device according to the present invention, FIG. 1 is a block diagram showing the circuit configuration, FIG. 2 is a time chart 1 for vehicle speed correction, and FIG. The partially enlarged view, FIG. 4, and FIG. 5 are explanatory diagrams of vehicle speed detection showing conventional examples, respectively. (Brief explanation of drawings showing main parts) 1. Acceleration sensor 2. Integrator 3. Correction circuit 4. Wheel speed sensor 5. Counter 1st 4th

Claims (1)

【特許請求の範囲】[Claims] 車体の加速度を検出する加速度センサと、加速度センサ
からの出力を積分して車体速度を推定する積分器と、車
輪の速度を検出する車輪速センサと、上記加速度センサ
により検出される加速度が一定値以下のときは積分器か
らの出力を車輪速センサからの出力により補正する補正
手段とを備えて構成されたことを特徴とする車体速度推
定装置。
An acceleration sensor that detects the acceleration of the vehicle body, an integrator that integrates the output from the acceleration sensor to estimate the vehicle speed, a wheel speed sensor that detects the speed of the wheels, and an acceleration sensor that detects the acceleration detected by the acceleration sensor is a constant value. A vehicle speed estimating device comprising: a correction means for correcting the output from the integrator by the output from the wheel speed sensor in the following cases.
JP33538089A 1989-12-25 1989-12-25 Car body speed estimating apparatus Pending JPH03195973A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP33538089A JPH03195973A (en) 1989-12-25 1989-12-25 Car body speed estimating apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP33538089A JPH03195973A (en) 1989-12-25 1989-12-25 Car body speed estimating apparatus

Publications (1)

Publication Number Publication Date
JPH03195973A true JPH03195973A (en) 1991-08-27

Family

ID=18287896

Family Applications (1)

Application Number Title Priority Date Filing Date
JP33538089A Pending JPH03195973A (en) 1989-12-25 1989-12-25 Car body speed estimating apparatus

Country Status (1)

Country Link
JP (1) JPH03195973A (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000162221A (en) * 1998-11-30 2000-06-16 Kenwood Corp Vehicle-speed detecting apparatus
JP2003118946A (en) * 2001-10-16 2003-04-23 Hitachi Ltd Control method and control device for elevator
JP2009198185A (en) * 2008-02-19 2009-09-03 Toyota Motor Corp Vehicle position attitude estimating device
JP2017101944A (en) * 2015-11-30 2017-06-08 パイオニア株式会社 Speed calculation device, control method, program, and storage medium
WO2017094065A1 (en) * 2015-11-30 2017-06-08 パイオニア株式会社 Speed calculation device, control method, program, and storage medium
WO2017094068A1 (en) * 2015-11-30 2017-06-08 パイオニア株式会社 Speed calculation device, control method, program, and storage medium
WO2018042628A1 (en) * 2016-09-02 2018-03-08 パイオニア株式会社 Speed calculation device, control method, program, and storage medium
JP2021066336A (en) * 2019-10-24 2021-04-30 株式会社ジェイテクト Control unit for four-wheel drive vehicle

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000162221A (en) * 1998-11-30 2000-06-16 Kenwood Corp Vehicle-speed detecting apparatus
JP2003118946A (en) * 2001-10-16 2003-04-23 Hitachi Ltd Control method and control device for elevator
JP2009198185A (en) * 2008-02-19 2009-09-03 Toyota Motor Corp Vehicle position attitude estimating device
JP2017101944A (en) * 2015-11-30 2017-06-08 パイオニア株式会社 Speed calculation device, control method, program, and storage medium
WO2017094065A1 (en) * 2015-11-30 2017-06-08 パイオニア株式会社 Speed calculation device, control method, program, and storage medium
WO2017094068A1 (en) * 2015-11-30 2017-06-08 パイオニア株式会社 Speed calculation device, control method, program, and storage medium
WO2018042628A1 (en) * 2016-09-02 2018-03-08 パイオニア株式会社 Speed calculation device, control method, program, and storage medium
JPWO2018042628A1 (en) * 2016-09-02 2019-06-24 パイオニア株式会社 Speed calculation device, control method, program and storage medium
EP3508861A4 (en) * 2016-09-02 2020-04-15 Pioneer Corporation Speed calculation device, control method, program, and storage medium
US11203349B2 (en) 2016-09-02 2021-12-21 Pioneer Corporation Velocity calculation apparatus, control method, program and storage medium
JP2021066336A (en) * 2019-10-24 2021-04-30 株式会社ジェイテクト Control unit for four-wheel drive vehicle

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