JP3918596B2 - Transmission control mechanism - Google Patents

Transmission control mechanism Download PDF

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Publication number
JP3918596B2
JP3918596B2 JP2002077702A JP2002077702A JP3918596B2 JP 3918596 B2 JP3918596 B2 JP 3918596B2 JP 2002077702 A JP2002077702 A JP 2002077702A JP 2002077702 A JP2002077702 A JP 2002077702A JP 3918596 B2 JP3918596 B2 JP 3918596B2
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Japan
Prior art keywords
vehicle
control device
inter
transmission
auto
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Expired - Fee Related
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JP2002077702A
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Japanese (ja)
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JP2003267087A (en
Inventor
恭一 阿部
善紀 見市
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Mitsubishi Motors Corp
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Mitsubishi Motors Corp
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  • Controls For Constant Speed Travelling (AREA)
  • Control Of Vehicle Engines Or Engines For Specific Uses (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は、車間距離センサ付きオートクルーズコントロール装置を装備した車両における変速機制御機構、とくに、車間距離の縮小に応じて変速機の変速比を制御するものに関する。
【０００２】
【従来の技術】
車間距離センサ付きオートクルーズコントロール装置を装備した従来の車両においては、車速設定に応じてオートクルーズコントロール装置がエンジンの出力や変速機の変速比を制御することにより設定車速を維持し、かつ、設定車速と関連して前車との距離が縮小したために危険性が生じた場合には、変速機の変速比を増加させてエンジンブレーキ力を増大させることにより、車両が減速するように制御している。
【０００３】
しかしながら、変速機が、とくに、ＣＶＴや遊星歯車式変速機等の自動変速機である場合には、オートクルーズコントロール装置が不作動とされていると、アクセルペダルがオフとされたときのエンジンブレーキ力が一般に小さくて、結果的にブレーキペダルを踏む頻度が増加しやすくなるという問題があった。
【０００４】
【発明が解決しようとする課題】
本発明は、車間距離センサ付きオートクルーズコントロール装置を装備した車両において、オートクルーズコントロール装置が不作動とされているとき、車間距離の縮小に応じてエンジンブレーキ力を増大させようとするものである。
【０００５】
【課題を解決するための手段】
このため、本発明にかかる変速機制御機構は、車間距離センサ付きオートクルーズコントロール装置を装備した車両において、上記オートクルーズコントロール装置が不作動とされているとき、上記車間距離センサにより検出された車間距離が前車との相対速度に関連した所定値より小さい場合に、上記オートクルーズコントロール装置が作動しているとき上記相対速度で上記車間距離の場合に設定される変速機の変速比よりも大きな変速比に上記変速機を調節する制御装置をそなえている。
【０００６】
すなわち、オートクルーズコントロール装置が不作動とされているとき、車間距離センサにより検出された車間距離が前車との相対速度に関連した所定値より小さいため車両に危険性が生じる場合に、制御装置が、オートクルーズコントロール装置が作動しているときにおける変速機の設定変速比よりも大きな変速比に変速機を調節するので、エンジンブレーキ力を増大させることができて、上記車両の危険性を容易に低減させることが可能となる。
【０００７】
【発明の実施の形態】
以下、図面に示す本発明の実施形態例について説明する。
【０００８】
図１において、車両に装備されてスイッチ１のオンオフにより作動あるいは不作動とされるオートクルーズコントロール装置２は、車速設定スイッチ３、車速センサ４、及び、車間距離センサ５からそれぞれ検知信号を受けていて、スイッチ１のオンにより作動とされているときには、上記検知信号に応じてエンジン６の出力、ＣＶＴ７の変速比等を制御して、車両の走行速度を車速設定スイッチ３により選定された車速を保持し、また、車間距離センサ５からの検知信号に基づき計測した前車との相対速度に対応してそれぞれ前車との安全距離を設定していて、前車との距離がこの安全距離にまで縮小したときには、その距離を維持して前車を追尾しながら走行するように、エンジン６の出力、ＣＶＴ７の変速比等を制御するようにすると共に、上記安全距離よりも車間距離が縮小した場合には、ＣＶＴ７の変速比を増加させてエンジンブレーキ力を増大させることにより、車両が減速するように制御している。
【０００９】
他方、車間距離センサ５の検知信号が制御装置１０へも送られ、制御装置１０は、その検知信号に基づき図２のフローチャートに従ってＣＶＴ７の変速比を調節する。
【００１０】
すなわち、ステップＳ１においてスイッチ１のオンオフがチェックされ、スイッチ１がオンとなっていればステップＳ２へ移行して、制御装置１０が車間距離センサ５からの検知信号に基づき前車との相対速度ΔＶ及び前車との距離Ｄを計測し、次のステップＳ３で相対速度ΔＶ及び前車との距離Ｄに応じてＣＶＴ７の変速比をオートクルーズコントロール装置２が制御するが、スイッチ１がオフとなっていればステップＳ４へ進む。
【００１１】
ステップＳ４では、制御装置１０が車間距離センサ５からの検知信号に基づき前車との相対速度ΔＶ及び前車との距離Ｄを計測すると共に、相対速度ΔＶに相応する前車との安全距離（前車との近接に伴う危険性を回避できる最小的な基準距離）Ｄ0 を演算して、ステップＳ５へ進む。
【００１２】
ステップＳ５では、制御装置１０が距離Ｄと安全距離Ｄ0 との大小を比較し、Ｄ≧Ｄ0 ならばステップＳ４へ移行して、ＣＶＴ７の変速比が通常のように制御されるが、Ｄ＜Ｄ0 ならばステップＳ７へ進む。
【００１３】
ステップＳ７において、制御装置１０は、オートクルーズコントロール装置２が作動しているとき、前車との相対速度が同じΔＶで、かつ、前車との距離が同じＤである場合に設定されるＣＶＴ７の変速比よりも大きな変速比となるように、例えば、変速比を一気に約１０〜１５％増加させ、あるいは、常に一定の大きな値に変化させるように、ＣＶＴ７を調節する。
【００１４】
従って、エンジン６によるエンジンブレーキ力が増大して、車両の強制的な減速が実現されることとなり、前車との近接に伴う危険性を容易に回避して、車両の安全性を高めることができ、また、ブレーキペダルを踏む頻度を確実に低減させて、車両の操縦性を良好とすることができる。
【００１５】
しかも、オートクルーズコントロール装置２に付属されていた車間距離センサ５を、オートクルーズコントロール装置２の不作動時にもそのまま利用しているため、コストアップを最小限に抑制することができる大きな利点がある。
【００１６】
なお、上記実施形態例においては、変速機としてＣＶＴが使用されているが、遊星歯車式自動変速機、歯車式手動変速機等の変速機における変速段やギヤ比を上記実施形態例の場合と同様に変化させることにより、上記実施形態例と同等の制御を行わせることができるのはいうまでもない。
【００１７】
【発明の効果】
本発明にかかる変速機制御機構にあっては、オートクルーズコントロール装置が不作動とされていても、前車との車間距離が前車との相対速度に関連した所定値より小さいため車両に危険性が生じる場合に、制御装置が変速機の変速比を大きく変化させて、エンジンブレーキ力を増大させることができるため、車両の危険性を容易に低減させることが可能となる。
【図面の簡単な説明】
【図１】本発明の実施形態例における配置図。
【図２】上記実施形態例の制御フローチャート。
【符号の説明】
１ スイッチ
２ オートクルーズコントロール装置
５ 車間距離センサ
７ ＣＶＴ
１０ 制御装置[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a transmission control mechanism in a vehicle equipped with an auto-cruise control device with an inter-vehicle distance sensor, and more particularly to an apparatus for controlling a transmission gear ratio according to a reduction in an inter-vehicle distance.
[0002]
[Prior art]
In a conventional vehicle equipped with an auto-cruise control device with an inter-vehicle distance sensor, the auto-cruise control device maintains and sets the vehicle speed by controlling the engine output and the transmission gear ratio according to the vehicle speed setting. If danger arises because the distance from the preceding vehicle has decreased in relation to the vehicle speed, the vehicle is controlled to decelerate by increasing the gear ratio of the transmission and increasing the engine braking force. Yes.
[0003]
However, when the transmission is an automatic transmission such as a CVT or a planetary gear type transmission, the engine brake when the accelerator pedal is turned off if the auto cruise control device is inactive. In general, the force is small, and as a result, the frequency of stepping on the brake pedal tends to increase.
[0004]
[Problems to be solved by the invention]
The present invention intends to increase the engine braking force in response to a reduction in the inter-vehicle distance when the auto-cruise control device is inactivated in a vehicle equipped with an auto-cruise control device with an inter-vehicle distance sensor. .
[0005]
[Means for Solving the Problems]
Therefore, the transmission control mechanism according to the present invention is a vehicle equipped with an auto-cruise control device with an inter-vehicle distance sensor, and the inter-vehicle distance detected by the inter-vehicle distance sensor when the auto-cruise control device is inoperative. When the distance is smaller than a predetermined value related to the relative speed with the preceding vehicle, when the auto-cruise control device is operating, the relative speed is larger than the transmission gear ratio set in the case of the inter-vehicle distance. A control device is provided for adjusting the transmission to a transmission ratio.
[0006]
That is, when the auto cruise control device is inactive, the control device is used when the vehicle is in danger because the inter-vehicle distance detected by the inter-vehicle distance sensor is smaller than a predetermined value related to the relative speed with the preceding vehicle. However, since the transmission is adjusted to a gear ratio larger than the transmission gear ratio when the auto-cruise control device is operating, the engine braking force can be increased and the risk of the vehicle can be easily increased. It is possible to reduce it.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention shown in the drawings will be described.
[0008]
In FIG. 1, an auto-cruise control device 2 that is installed in a vehicle and is activated or deactivated by turning on / off a switch 1 receives detection signals from a vehicle speed setting switch 3, a vehicle speed sensor 4, and an inter-vehicle distance sensor 5. When the switch 1 is turned on, the output of the engine 6, the gear ratio of the CVT 7 and the like are controlled according to the detection signal, and the vehicle speed selected by the vehicle speed setting switch 3 is set. In addition, a safety distance is set for each of the front cars corresponding to the relative speed with the front car measured based on the detection signal from the inter-vehicle distance sensor 5, and the distance to the front car is the safety distance. When the vehicle is reduced to the maximum, the output of the engine 6, the gear ratio of the CVT 7, etc. are controlled so that the vehicle travels while keeping the distance and tracking the front vehicle. In the case of reduced inter-vehicle distance than the safety distance, by increasing the engine brake force by increasing the gear ratio of CVT7, it is controlled so that the vehicle is decelerated.
[0009]
On the other hand, the detection signal of the inter-vehicle distance sensor 5 is also sent to the control device 10, and the control device 10 adjusts the gear ratio of the CVT 7 based on the detection signal according to the flowchart of FIG.
[0010]
That is, in step S1, the on / off state of the switch 1 is checked. If the switch 1 is on, the process proceeds to step S2, and the control device 10 determines the relative speed ΔV with respect to the front vehicle based on the detection signal from the inter-vehicle distance sensor 5. In the next step S3, the automatic cruise control device 2 controls the gear ratio of the CVT 7 according to the relative speed ΔV and the distance D to the front vehicle, but the switch 1 is turned off. If so, the process proceeds to step S4.
[0011]
In step S4, the control device 10 measures the relative speed ΔV with respect to the preceding vehicle and the distance D with respect to the preceding vehicle based on the detection signal from the inter-vehicle distance sensor 5, and at the same time, the safety distance from the preceding vehicle corresponding to the relative speed ΔV ( The minimum reference distance (D0) that can avoid the danger associated with the proximity of the preceding vehicle is calculated, and the process proceeds to step S5.
[0012]
In step S5, the control device 10 compares the distance D with the safety distance D0, and if D ≧ D0, the process proceeds to step S4, where the transmission ratio of the CVT 7 is controlled as usual, but D <D0. If so, the process proceeds to step S7.
[0013]
In step S7, the control device 10 is set when the auto cruise control device 2 is operating and the relative speed with the front vehicle is the same ΔV and the distance from the front vehicle is the same D. For example, the CVT 7 is adjusted so that the speed ratio is increased by about 10 to 15% at a stroke, or is always changed to a constant large value, so that the speed ratio becomes larger than the above speed ratio.
[0014]
Therefore, the engine braking force by the engine 6 is increased, and the vehicle is forcibly decelerated. The danger associated with the proximity of the front vehicle can be easily avoided, and the safety of the vehicle can be improved. In addition, the frequency of stepping on the brake pedal can be surely reduced, and the controllability of the vehicle can be improved.
[0015]
In addition, since the inter-vehicle distance sensor 5 attached to the auto-cruise control device 2 is used as it is even when the auto-cruise control device 2 is not operating, there is a great advantage that the cost increase can be suppressed to a minimum. .
[0016]
In the above embodiment, CVT is used as a transmission. However, the gear position and gear ratio in a transmission such as a planetary gear automatic transmission and a gear manual transmission are the same as those in the above embodiment. It goes without saying that the same control as in the above embodiment can be performed by changing in the same manner.
[0017]
【The invention's effect】
In the transmission control mechanism according to the present invention, even if the auto-cruise control device is inoperative, the distance between the vehicle and the front vehicle is smaller than a predetermined value related to the relative speed with the front vehicle. Therefore, the control device can greatly change the gear ratio of the transmission and increase the engine braking force. Therefore, it is possible to easily reduce the risk of the vehicle.
[Brief description of the drawings]
FIG. 1 is a layout diagram according to an embodiment of the present invention.
FIG. 2 is a control flowchart of the embodiment.
[Explanation of symbols]
1 switch 2 auto cruise control device 5 inter-vehicle distance sensor 7 CVT
10 Control device

Claims (2)

車間距離センサ付きオートクルーズコントロール装置を装備した車両において、上記オートクルーズコントロール装置が不作動とされているとき、上記車間距離センサにより検出された車間距離が前車との相対速度に関連した所定値より小さい場合に、上記オートクルーズコントロール装置が作動しているとき上記相対速度で上記車間距離の場合に設定される変速機の変速比よりも大きな変速比に上記変速機を調節する制御装置をそなえた変速機制御機構。In a vehicle equipped with an auto-cruise control device with an inter-vehicle distance sensor, when the auto-cruise control device is disabled, the inter-vehicle distance detected by the inter-vehicle distance sensor is a predetermined value related to the relative speed with the preceding vehicle. A control device for adjusting the transmission to a gear ratio larger than the transmission gear ratio set in the case of the inter-vehicle distance at the relative speed when the auto-cruise control device is operating, Transmission control mechanism. 請求項１において、上記制御装置により調節された上記変速比が一定値である変速機制御機構。2. The transmission control mechanism according to claim 1, wherein the speed ratio adjusted by the control device is a constant value.
JP2002077702A 2002-03-20 2002-03-20 Transmission control mechanism Expired - Fee Related JP3918596B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
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JP3918596B2 true JP3918596B2 (en) 2007-05-23

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7291067B2 (en) 2019-11-26 2023-06-14 富士変速機株式会社 Stop support device and parking device

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007232047A (en) * 2006-02-28 2007-09-13 Hitachi Ltd Device and method for controlling automobile
JP4822434B2 (en) * 2006-09-16 2011-11-24 独立行政法人農業・食品産業技術総合研究機構 Tracking speed control device for self-propelled transport vehicle and tracking speed control method for self-propelled transport vehicle

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7291067B2 (en) 2019-11-26 2023-06-14 富士変速機株式会社 Stop support device and parking device

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