JP2010139330A5

JP2010139330A5 -

Info

Publication number: JP2010139330A5
Application number: JP2008314909A
Authority: JP
Filing date: 2008-12-10
Publication date: 2012-01-19
Anticipated expiration: 2028-12-10

Description

すなわち、本発明に係る車間距離検出装置は、車両の前部または後部に設置され、前記車両の前方を先行する先行車または前記車両の後方に続く後続車に対して超音波を送信するとともに、前記先行車または前記後続車で反射して戻った超音波を受信する超音波送受信機と、前記超音波が前記超音波送受信機から送信されてから、前記超音波が反射波として受信されるまでの経過時間を計時する計時手段および前記経過時間に基づいて前記先行車または前記後続車との間の車間距離を算出する距離演算部を有する距離算出装置と、を備えた車間距離検出装置であって、前記超音波送受信機は、一定周波数の超音波を一定時間間隔でパルス状に送信するものであり、前記距離算出装置は、前記反射波として受信した受信超音波のうち、前記超音波送受信機から送信された送信超音波の周波数との周波数差が予め設定された所定値以上となる周波数成分を、路面から反射して受信したノイズ成分として除去するノイズ信号除去手段を備え、前記ノイズ信号除去手段は、前記反射波として受信した受信超音波を予め設定した所定の時間間隔ごとに取り込むとともに、この所定時間間隔ごとに取り込まれた受信超音波を周波数成分に展開する周波数成分展開部と、前記周波数成分展開部によって展開して得られた周波数成分ごとの受信超音波のうち、前記超音波送受信機から送信された送信超音波の周波数との周波数差が予め設定された所定値以上となる周波数成分を前記ノイズ成分として除去するフィルタと、前記受信超音波を取り込むために区切られた複数の時間間隔のうち、前記フィルタにより前記ノイズ成分が除去された後の周波数成分の受信レベルが最大となる受信超音波が含まれた時間間隔までを、前記送信超音波が送信されてからの前記経過時間として出力する経過時間演算部と、を備え、前記距離演算部は、前記経過時間演算部から出力された前記経過時間に基づいて、前記車間距離を算出するものであることを特徴とする。 That is, the inter-vehicle distance detection device according to the present invention is installed at the front or rear part of the vehicle, and transmits ultrasonic waves to the preceding vehicle preceding the front of the vehicle or the succeeding vehicle following the vehicle, An ultrasonic transmitter / receiver that receives an ultrasonic wave reflected and returned by the preceding vehicle or the subsequent vehicle, and after the ultrasonic wave is transmitted from the ultrasonic transmitter / receiver until the ultrasonic wave is received as a reflected wave A distance calculation device having a time calculation means for measuring an elapsed time of the vehicle and a distance calculation device for calculating an inter-vehicle distance between the preceding vehicle and the subsequent vehicle based on the elapsed time. Te, the ultrasonic transceiver is for transmitting an ultrasonic wave having a constant frequency pulsed at regular time intervals, said distance calculating device, of the received ultrasonic waves received as the reflected wave, the ultrasonic sound A frequency component frequency difference between the frequency of the transmitted transmission ultrasound from the transceiver is preset predetermined value or more, comprising a noise signal elimination means for divided as noise Ingredient received reflected from the road surface The noise signal removing means captures the received ultrasonic waves received as the reflected waves at predetermined time intervals set in advance, and develops the received ultrasonic waves captured at the predetermined time intervals into frequency components. Of the received ultrasound for each frequency component developed by the deploying unit and the frequency component deploying unit, a predetermined frequency difference is set in advance between the frequency of the transmitted ultrasound transmitted from the ultrasound transceiver A filter that removes a frequency component that is greater than or equal to a value as the noise component, and a plurality of time intervals that are divided to capture the received ultrasound. Elapsed time that is output as the elapsed time since the transmission ultrasonic wave is transmitted until the time interval including the reception ultrasonic wave in which the reception level of the frequency component after the noise component is removed by the data is maximized comprising an arithmetic unit, a, is pre-Symbol distance calculator, based on the previous SL elapsed time output from the elapsed time calculating unit, and characterized in that for calculating the inter-vehicle distance.

そして、本発明に係る車間距離検出装置によれば、超音波送受信機は一定周波数の超音波を送信するところ、自車両に対する相対的な速度差の小さい先行車や後続車で反射して、超音波送受信機により受信された反射超音波の周波数は、超音波送受信機から送信されたときの周波数と略同一となるか、またはドップラー効果による周波数偏移があったとしても極わずかであり、送信されたときの周波数から大きく偏移したものとはならない。 Then, according to the vehicle distance detecting device according to the present invention, an ultrasonic transceiver where transmitting ultrasonic waves of a predetermined frequency, reflected by the small leading vehicle and the follower vehicle with the relative speed difference with respect to the vehicle, The frequency of the reflected ultrasonic wave received by the ultrasonic transceiver is substantially the same as the frequency when transmitted from the ultrasonic transceiver, or even if there is a frequency shift due to the Doppler effect, It does not deviate significantly from the frequency at which it was transmitted.

Claims

車両の前部または後部に設置され、前記車両の前方を先行する先行車または前記車両の後方に続く後続車に対して超音波を送信するとともに、前記先行車または前記後続車で反射して戻った超音波を受信する超音波送受信機と、前記超音波が前記超音波送受信機から送信されてから、前記超音波が反射波として受信されるまでの経過時間を計時する計時手段および前記経過時間に基づいて前記先行車または前記後続車との間の車間距離を算出する距離演算部を有する距離算出装置と、を備えた車間距離検出装置であって、
前記超音波送受信機は、一定周波数の超音波を一定時間間隔でパルス状に送信するものであり、
前記距離算出装置は、前記反射波として受信した受信超音波のうち、前記超音波送受信機から送信された送信超音波の周波数との周波数差が予め設定された所定値以上となる周波数成分を、路面から反射して受信したノイズ成分として除去するノイズ信号除去手段を備え、
前記ノイズ信号除去手段は、前記反射波として受信した受信超音波を予め設定した所定の時間間隔ごとに取り込むとともに、この所定時間間隔ごとに取り込まれた受信超音波を周波数成分に展開する周波数成分展開部と、前記周波数成分展開部によって展開して得られた周波数成分ごとの受信超音波のうち、前記超音波送受信機から送信された送信超音波の周波数との周波数差が予め設定された所定値以上となる周波数成分を前記ノイズ成分として除去するフィルタと、前記受信超音波を取り込むために区切られた複数の時間間隔のうち、前記フィルタにより前記ノイズ成分が除去された後の周波数成分の受信レベルが最大となる受信超音波が含まれた時間間隔までを、前記送信超音波が送信されてからの前記経過時間として出力する経過時間演算部と、を備え、
前記距離演算部は、前記経過時間演算部から出力された前記経過時間に基づいて、前記車間距離を算出するものであることを特徴とする車間距離検出装置。 It is installed at the front or rear of the vehicle and transmits ultrasonic waves to the preceding vehicle preceding the front of the vehicle or the succeeding vehicle following the rear of the vehicle and reflected back by the preceding vehicle or the following vehicle. An ultrasonic transmitter / receiver for receiving the ultrasonic wave, time measuring means for measuring an elapsed time from when the ultrasonic wave is transmitted from the ultrasonic transmitter / receiver until the ultrasonic wave is received as a reflected wave, and the elapsed time A distance calculation device having a distance calculation unit for calculating an inter-vehicle distance between the preceding vehicle and the subsequent vehicle based on
The ultrasonic transmitter / receiver transmits ultrasonic waves of a constant frequency in a pulse shape at regular time intervals,
The distance calculation device includes, among the received ultrasonic waves received as the reflected wave , a frequency component having a frequency difference with a frequency of a transmission ultrasonic wave transmitted from the ultrasonic transceiver is equal to or greater than a predetermined value, comprising a noise signal elimination means for divided as noise Ingredient received reflected from the road surface,
The noise signal removing means captures the received ultrasonic wave received as the reflected wave at a predetermined time interval set in advance, and expands the received ultrasonic wave captured at the predetermined time interval into a frequency component. And a predetermined value in which a frequency difference between the frequency of the transmission ultrasonic wave transmitted from the ultrasonic transceiver is set in advance among the received ultrasonic waves for each frequency component developed by the frequency component expansion unit A filter that removes the above frequency component as the noise component, and a reception level of the frequency component after the noise component is removed by the filter out of a plurality of time intervals divided for capturing the received ultrasonic waves Elapsed time to output as the elapsed time since the transmission ultrasonic wave is transmitted until the time interval including the reception ultrasonic wave that maximizes Comprising an arithmetic unit, a
Prior Symbol distance calculator, the elapsed time based on the previous SL elapsed time output from the arithmetic unit, the inter-vehicle distance detecting device, characterized in that it is intended to calculate the inter-vehicle distance.

請求項１に記載の車間距離検出装置と、前記車間距離検出装置によって検出された車間距離が予め設定された距離よりも短いときは、前記車間距離を拡げるように前記車両の車速を制御する車速制御装置と、を備えたことを特徴とする車速制御システム。 The vehicle speed for controlling the vehicle speed of the vehicle so as to increase the inter-vehicle distance when the inter-vehicle distance detected by the inter-vehicle distance detection device according to claim 1 and the inter-vehicle distance detected by the inter-vehicle distance detection device is shorter than a preset distance. A vehicle speed control system comprising: a control device;

前記車速制御装置は、前記車間距離検出装置によって検出された車間距離が予め設定された第１の距離よりも短いときは、前記車間距離を急激に拡げるように前記車両の車速を制御し、前記車間距離検出装置によって検出された車間距離が、前記第１の距離よりも長く、かつ第１の距離よりも長く設定された第２の距離よりも短いときは、車間距離を緩く拡げるように前記車両の車速を制御するものであることを特徴とする請求項２に記載の車速制御システム。 The vehicle speed control device controls the vehicle speed of the vehicle so as to rapidly increase the inter-vehicle distance when the inter-vehicle distance detected by the inter-vehicle distance detection device is shorter than a preset first distance, When the inter-vehicle distance detected by the inter-vehicle distance detection device is longer than the first distance and shorter than the second distance set to be longer than the first distance, the inter-vehicle distance is loosened and widened. The vehicle speed control system according to claim 2, wherein the vehicle speed control system controls the vehicle speed of the vehicle.