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What is CMS? How it works System Confguration Warning Devices Collision Avoidance Maneuvers

Conclusions

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Honda Motor: Science & Education. Trends in Japan

2003

Autoweb.com.au: Honda Deveops !ew "oision

Avoidance Sa#et$ S$stem. 2003 %rancois ranet' (osea )icado' *auren Smit+:

*on,itudina Avoidance. 2003

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"MS is t+e word-s #irst "oision Miti,ation ra/eS$stem "MS1. T+e tec+noo,$ predicts rearendcoisions and assists bra/e operation to reduce t+eimpact.

"MS anticipates a coision based on drivin,conditions' distance to t+e ve+ice a+ead and reativespeeds. t t+en uses visua and audio warnin,s to

 prompt t+e driver to ta/e preventative action and aso

initiates bra/in, i# t+e driver #ais to respond to t+ewarnin,s.

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%irst' t+e radar measures t+e distance between t+e car andot+er ve+ices up to 400 meters a+ead and an$ di##erences inspeed' and an onboard computer 5ud,es t+e ris/ o# a coision

 based on t+is in#ormation and on data about t+e course o# t+ecar.

T+en i# t+e s$stem 5ud,es t+at t+ere is a ris/ o# a cras+' suc+as w+en t+e car ,ets too cose to t+e ve+ice in #ront' it aertst+e driver b$ soundin, an aarm and i,+tin, up a 6(A7E8warnin, on t+e das+board. T+is is t+e #irst warnin, sta,e'aimed at aertin, t+e driver to t+e dan,er and encoura,in, t+e

driver to sow down.

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T+e s$stem wor/s in con5unction wit+ t+e 9E)retensioner9 seatbet retraction s$stem. # t+e carcontinues to ,et coser to t+e ot+er ve+ice and t+e

computer decides t+at it wi be +ard to avoid a coision' itti,+tens t+e seatbet more #irm$ and appies t+e bra/es#orcib$ and +ard.

T+e "MS +as t+ree sta,ed modes:

An audibe warnin,'

An audibe warnin,' i,+t bra/in, and i,+t seatbet

retraction. An audibe warnin,' stron, bra/in, and stron, seatbet

retraction.

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Millimeter-wave radar: Detects ve+ices wit+in a ran,eo# about 400 meters a+ead' in a 4de,ree arc.

Sensors: T+e s$stem determines drivin, conditions usin, aran,e o# sensors t+at detect #actors suc+ as $aw rate'steerin, an,e' w+ee speed' and bra/e pressure.

CMS Electronic Control Unit (ECU): ased on distanceto t+e ve+ice a+ead and reative speed obtained #rom radarin#ormation' t+e E"; cacuates t+e i/ei+ood o# acoision' and warns t+e driver' and in some cases activatest+e bra/in, #unction.

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E-Pretensioner ECU: Sends instructions to t+e motori<edE)retensioner to retract t+e seatbet' based on bra/in,instruction si,nas #rom t+e "MS E"; and eectronica$controed bra/e assist si,nas.

E-Pretensioner: (etracts t+e seatbet usin, an internamotor' based on instructions #rom t+e E)retensioner E";.

;sed in combination wit+ conventiona pretensioners. Meter unit: (eceives si,nas #rom t+e "MS E";' and

warns t+e driver o# potentia dan,er usin, a bu<<er and avisua warnin,.

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6%i,ure: Autoweb.com.au' "AS 20038

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Visual head-up displays:  warnin,s are dispa$ed on t+e

winds+ied in t+e driver-s #ied o# view.

 Audio/Voice signals:  auditor$ si,nas appear to be ess

intrusive on drivin, tas/s.

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 Headway distance control:  t+e s$stem warns t+e driverw+enever +is=+er car is #oowin, t+e eadin, car too cose$

 Hazard warning:  t+e s$stem warns t+e driver o# an ob5ect

wit+in its pro5ected pat+' so t+at t+e driver +as su##icient timeto avoid a cras+.

 Automatic vehicle control:  t+e s$stem contros t+e ve+ice-s bra/es and steerin, w+ee

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Sensors #u#i t+e tas/s o# +eadwa$ contro andobstace detection' w+ic+ are t+e basis o# "oisionAvoidance S$stems "AS1 Sensin,.

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Sensor  Sensing

RangeResolution

Directional

ity

Response

TimeCost Size

Ultrasonics ! m" #ma$% ! mm" &! deg" #min%s'eed o(sound )*

&! mm"diameter

+assive,n(rared ! m" #ma$% 'oor -! deg" sec" under )!

.! mm"s/uare

0aser radar

#lidar%

!! m" #ma$%1

!"* m" #min% mm" #min% deg"

(ast #!

msec"% over )*!

*! mm" $ !!

mm"

2MCW 3adar *! m" ! mm". deg" orwider (ast #msec% over ).!!

.*! mm" $ *!mm"

,m'ulse3adar *! m" #ma$% ! mm" .* deg" 2ast #msec% over )!!

.*! mm" $ !!mm"

Ca'acitive . m" #ma$% ! mm"

-! deg" 4r

wider (ast #msec% ) small5isionSystems !! m" 'oor good !! msec" 4ver ).!!

6! mm" $ !!mm"

Table 2

Sensor Devices' Measures of Performance

Source:  Sto7art and U'ton1 --*

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Sensin, ran,e: t+e ma>imum ran,e over w+ic+ t+etec+ni?ue can be used

(esoution: t+e reative c+an,e in distance t+at can bemeasured

Directionait$: t+e widt+ o# t+e beam over w+ic+ t+esensor is sensitive

(esponse time: +ow ?uic/$ t+e sensor can respond to a

c+an,e in distance

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Automatic bra/in, s$stems can detect an obstace and brin,t+e car to a compete +at 5ust be#ore impact. T+e tec+noo,$+as reac+ed t+e eve w+ere t+e s$stems can even detect t+e

speed o# a ve+ice in #ront' compare it wit+ t+e speed o# t+euser-s car' and stop t+e car to avoid an accident. Honda andTo$ota are app$in, and testin, t+ese Automatic bra/in,s$stems nowada$s and wi continue improvin, t+is t$pe o#tec+noo,$.