1996 ACURA RL KA9 Service Repair Manual

*1: '9 7 - 9 9 model s
*2 : '0 0 - 0 1 model s
Descriptio n
Overview
The Acur a Navigatio n Syste m is a highly-sophisticated , hybri d locatin g syste m tha t use s satellite s an d a ma p databas e to
sho w yo u wher e yo u ar e an d to hel p guid e yo u to a desire d destination .
Th e Navigatio n Syste m receive s signal s fro m th e Globa l Positionin g Syste m (GPS), a networ k o f 2 4 satellite s i n orbi t
aroun d th e earth . B y receivin g signal s fro m severa l o f thes e satellites , th e Navigatio n Syste m ca n determin e th e latitud e
an d longitud e o f th e vehicle . I n addition , signal s fro m th e system' s ya w rat e senso r an d th e vehicl e spee d senso r (VSS )
enabl e th e syste m to kee p trac k o f th e vehicle' s directio n an d spee d o f travel .
Thi s hybri d syste m ha s advantage s ove r a syste m tha t i s eithe r entirel y self-containe d o r on e tha t relie s totall y o n th e
GPS . Fo r example , th e self-containe d portio n o f th e syste m ca n kee p trac k o f vehicl e positio n eve n whe n satellit e signal s
canno t b e received , an d th e GP S can keep trac k o f th e vehicl e positio n eve n whe n th e vehicl e is transporte d b y ferry .
Th e Navigatio n Syste m applie s al l thi s location , direction , an d spee d informatio n to th e map s an d calculate s a rout e to th e
destinatio n entered . A s yo u driv e to tha t destination , th e syste m provide s bot h visua l an d audi o guidance .
System Diagra m
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Navigation Functio n
The navigatio n syste m is compose d o f th e navigatio n unit , th e vehicl e spee d sensor , th e GP S antenna , an d th e displa y
unit.
Functio n Diagra m
*1: '9 7 - 9 9 model s
Vehicl e Spee d Senso r (VSS ) *2 : '0 0 - 0 1 model s
Th e vehicl e spee d senso r (VSS ) i s drive n b y th e differentia l gear . Fo r ever y revolutio n o f th e sensor , a four-puls e signa l i s
sen t t o th e navigatio n unit . Th e VS S output s th e distanc e signa l b y turnin g th e navigatio n unit' s senso r powe r o n an d off .
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Description
Navigation Functio n (cont'd )
Yaw Rat e Senso r
Th e ya w rat e senso r detect s th e directio n chang e (angula r speed ) o f th e vehicle . Th e senso r i s a n oscillatio n gyr o buil t int o
the navigatio n unit .
Senso r Elemen t Structur e
Th e senso r elemen t i s shape d lik e a tunin g fork , an d it consist s o f th e piezoelectri c parts , th e meta l block , an d th e suppor t
pin . Ther e ar e fou r piezoelectri c parts : on e t o driv e th e oscillators , on e fo r monitorin g tha t maintain s th e oscillatio n a t a
regula r frequency , an d tw o t o detec t angula r velocity . Th e tw o oscillator s hav e a 90 degre e twis t i n th e center , ar e con -
necte d a t th e botto m b y th e meta l block , an d supporte d b y th e suppor t pin . A detectio n piezoelectri c par t i s attache d to th e
to p o f eac h oscillator . Th e drivin g piezoelectri c par t i s attache d t o th e botto m o f on e oscillator , an d th e monitoring piezo-
electri c par t i s attache d t o th e botto m o f th e othe r oscillator .
Oscillatio n Gyr o Principle s
Th e piezoelectri c part s hav e "electric/mechanica l transfe r characteristics. " Th e piezoelectri c part s ben d verticall y whe n
voltag e is applie d t o bot h side s o f th e parts , an d voltag e is generate d betwee n bot h side s o f th e piezoelectri c part s whe n
the y ar e ben t b y a n externa l force . Th e oscillatio n gyr o function s b y utilizin g thi s characteristi c o f th e piezoelectri c part s
an d "Corioli s force. " (Corioli s forc e deflect s movin g object s a s a resul t o f th e earth' s rotation. ) I n th e oscillation gyro, thi s
forc e move s th e senso r elemen t whe n angula r velocit y is applied .
Operatio n
1. Th e drivin g piezoelectri c par t oscillate s th e oscillato r b y repeatedl y bendin g an d returnin g whe n a n A C voltag e a t 6 kH z
is applie d t o th e part . Th e monitoring-sid e oscillato r resonate s becaus e it i s connecte d t o th e driving-sid e oscillato r b y
th e meta l block .
2. Th e monitorin g piezoelectri c part s bend s in proportio n to th e oscillatio n an d output s voltag e (th e monito r signal) . Th e
navigatio n uni t contro l circui t control s th e driv e signa l t o stabiliz e th e monito r signal .
3 . Whe n th e vehicl e is stopped , th e detectin g piezoelectri c part s oscillat e righ t an d lef t wit h th e oscillators , bu t n o signa l i s
outpu t becaus e th e part s ar e no t ben t (n o angula r force) .
4 . Whe n th e vehicl e turn s t o th e right , th e senso r elemen t move s i n a circula r motio n wit h th e righ t oscillato r bendin g for -
war d an d th e lef t oscillato r bendin g rearward . Th e amoun t o f forward/rearwar d ben d varie s accordin g t o th e angula r
velocity o f th e vehicle .
5. Th e detectin g piezoelectri c part s outpu t voltag e (th e ya w rat e signal ) accordin g t o th e amoun t o f bend . Th e amoun t o f
vehicl e directio n chang e is determine d b y measurin g thi s voltage .
Enlarged vie w o f senso r elemen t Senso r elemen t to p vie w
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GPS Antenn a
Receivin g th e electri c wave s fro m th e satellites , th e GP S antenn a amplifie s an d transmit s the m to th e GP S receiver .
GPS Receive r
The GP S receive r i s buil t i n th e navigatio n unit . I t calculate s th e vehicl e positio n b y receivin g th e signa l fro m th e GP S
antenna . Th e vehicl e positio n an d signa l receptio n conditio n is transmitte d fro m th e GP S receive r t o th e navigatio n contro l
uni t t o adjus t vehicl e position . (cont'd )
Globa
l Positionin g Syste m (GPS )
Th e Globa l Positionin g Syste m (GPS ) enable s th e navigatio n syste m to determin e th e curren t positio n o f th e vehicl e b y
usin g th e electri c wave s transmitte d fro m th e satellite s i n orbi t aroun d th e earth . Th e satellite s transmi t th e satellit e identi -
ficatio n signal , orbi t information , transmissio n tim e signal , an d othe r information . Whe n th e GP S receive r receive s th e
electri c wave s fro m thre e o r mor e satellite s simultaneously , i t calculate s th e curren t positio n o f th e vehicl e base d o n th e
distanc e to eac h satellit e an d th e satellit e position s o n thei r respectiv e orbits .
Positio n detectio n Imag e wit h GP S satellit e
NOTE: Fou r satellite s o n eac h o f si x orbits .
Precisio n o f GP S
Th e precisio n o f th e GP S varie s accordin g to th e numbe r o f satellite s fro m whic h electri c wave s ar e receive d an d th e con -
tro l condition . Th e precisio n is indicate d b y th e GP S mar k show n o n th e uppe r lef t o f th e display .
GPS MAR K
No satellit e
mark
No. o f
SATELLITE S
Two o r les s
CONDITIO N
Impossibl e t o detec t
vehicl e positio n
Three
Four o r mor e
Yello
w
satellit e
mark
Gree n
satellit e
mark
Not indicate d Vehicl
e positio n
detectabl e in tw o
dimension s
Vehicl e positio n
detectabl e in thre e
dimension sFaulty
DESCRIPTIO N
GPS functio n is normal .
Th e satellit e electri c wave s receive d
b y th e GP S ar e to o fe w to detec t th e
vehicl e position .
Th e longitud e an d latitud e o f th e
vehicl e positio n ca n b e detected .
(Les s precis e tha n detectio n in thre e
dimensions )
The longitude , latitud e an d th e alti -
tud e o f th e vehicl e positio n can be
detected . (Mor e precis e tha n detec -
tio n i n tw o dimensions )
Th e GP S can' t b e use d du e to a
fault y GP S receiver , ope n in th e
wire , o r othe r fault .
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