Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Acura 3.5RL 1996-2004 Approved srm RL9604S23367A
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Main Menu Table of Contents
Navigation Function
The navigation system is composed of the navigation unit, the vehicle speed sensor, the GPS antenna, and the display
unit.
Function Diagram
*1: '97 - 99 models
Vehicle Speed Sensor (VSS) *2: '00 - 01 models
The vehicle speed sensor (VSS) is driven by the differential gear. For every revolution of the sensor, a four-pulse signal is
sent to the navigation unit. The VSS outputs the distance signal by turning the navigation unit's sensor power on and off.
Main Menu Table of Contents
Description
Navigation Function (cont'd)
Yaw Rate Sensor
The yaw rate sensor detects the direction change (angular speed) of the vehicle. The sensor is an oscillation gyro built into
the navigation unit.
Sensor Element Structure
The sensor element is shaped like a tuning fork, and it consists of the piezoelectric parts, the metal block, and the support
pin. There are four piezoelectric parts: one to drive the oscillators, one for monitoring that maintains the oscillation at a
regular frequency, and two to detect angular velocity. The two oscillators have a 90 degree twist in the center, are con-
nected at the bottom by the metal block, and supported by the support pin. A detection piezoelectric part is attached to the
top of each oscillator. The driving piezoelectric part is attached to the bottom of one oscillator, and the monitoring piezo-
electric part is attached to the bottom of the other oscillator.
Oscillation Gyro Principles
The piezoelectric parts have "electric/mechanical transfer characteristics." The piezoelectric parts bend vertically when
voltage is applied to both sides of the parts, and voltage is generated between both sides of the piezoelectric parts when
they are bent by an external force. The oscillation gyro functions by utilizing this characteristic of the piezoelectric parts
and "Coriolis force." (Coriolis force deflects moving objects as a result of the earth's rotation.) In the oscillation gyro, this
force moves the sensor element when angular velocity is applied.
Operation
1. The driving piezoelectric part oscillates the oscillator by repeatedly bending and returning when an AC voltage at 6 kHz
is applied to the part. The monitoring-side oscillator resonates because it is connected to the driving-side oscillator by
the metal block.
2. The monitoring piezoelectric parts bends in proportion to the oscillation and outputs voltage (the monitor signal). The
navigation unit control circuit controls the drive signal to stabilize the monitor signal.
3. When the vehicle is stopped, the detecting piezoelectric parts oscillate right and left with the oscillators, but no signal is
output because the parts are not bent (no angular force).
4. When the vehicle turns to the right, the sensor element moves in a circular motion with the right oscillator bending for-
ward and the left oscillator bending rearward. The amount of forward/rearward bend varies according to the angular
velocity of the vehicle.
5. The detecting piezoelectric parts output voltage (the yaw rate signal) according to the amount of bend. The amount of
vehicle direction change is determined by measuring this voltage.
Enlarged view of sensor element Sensor element top view
Main Menu Table of Contents
Global Positioning System (GPS)
The Global Positioning System (GPS) enables the navigation system to determine the current position of the vehicle by
using the electric waves transmitted from the satellites in orbit around the earth. The satellites transmit the satellite identi-
fication signal, orbit information, transmission time signal, and other information. When the GPS receiver receives the
electric waves from three or more satellites simultaneously, it calculates the current position of the vehicle based on the
distance to each satellite and the satellite positions on their respective orbits.
Position detection Image with GPS satellite
NOTE: Four satellites on each of six orbits.
Precision of GPS
The precision of the GPS varies according to the number of satellites from which electric waves are received and the con-
trol condition. The precision is indicated by the GPS mark shown on the upper left of the display.
No. of
GPS MARK CONDITION DESCRIPTION
SATELLITES
No satellite Two or less Impossible to detect GPS function is normal.
mark vehicle position The satellite electric waves received
by the GPS are too few to detect the
vehicle position.
Yellow Three Vehicle position The longitude and latitude of the
satellite detectable in two vehicle position can be detected.
mark dimensions (Less precise than detection in three
dimensions)
Green Four or more Vehicle position The longitude, latitude and the alti-
satellite detectable in three tude of the vehicle position can be
mark dimensions detected. (More precise than detec-
tion in two dimensions)
Not indicated Faulty The GPS can't be used due to a
faulty GPS receiver, open in the
wire, or other fault.
GPS Antenna
Receiving the electric waves from the satellites, the GPS antenna amplifies and transmits them to the GPS receiver.
GPS Receiver
The GPS receiver is built in the navigation unit. It calculates the vehicle position by receiving the signal from the GPS
antenna. The vehicle position and signal reception condition is transmitted from the GPS receiver to the navigation control
unit to adjust vehicle position. (cont'd)
Main Menu Table of Contents
Description
Navigation Function (cont'd)
Navigation Unit
The navigation unit calculates the vehicle position and guides you to the destination. The unit performs map matching
correction, GPS correction, and distance tuning. It also controls the menu functions and the DVD-ROM drive (hard disk
drive '96 - 99 models). With control of all these items, the navigation unit makes the navigation picture signal, then it
transmits the signal to the display unit and audio driving instructions to the audio unit.
Calculation of Vehicle Position
The navigation unit calculates the vehicle position (the driving direction and the current position) by receiving the direc-
tional change signals from the yaw rate sensor and the travel distance signals from the vehicle speed sensor (VSS).
Map Matching Tuning
The map matching tuning is accomplished by indicating the vehicle position on the roads on the map. The map data
transmitted from the DVD-ROM (hard disk '96 - 99 models) is checked against the vehicle position data, and the vehicle
position is indicated on the nearest road. Map matching tuning does not occur when the vehicle travels on a road not
shown on the map or when the vehicle position is far away from a road on the map.
GPS Tuning
The GPS tuning is accomplished by indicating the vehicle position as the GPS's vehicle position. The navigation unit com-
pares its calculated vehicle position data with the GPS vehicle position data. If there is large difference between the two,
the indicated vehicle position is adjusted to the GPS vehicle position.
Distance Tuning
The distance tuning reduces the difference between the travel distance signal from the VSS and the distance data on the
map. The navigation unit compares its calculated vehicle position data with the GPS vehicle position data. The navigation
unit then decreases the tuning value when the vehicle position is ahead of the GPS vehicle position, and it increases the
tuning value when the vehicle position is behind the GPS vehicle position.
Route Guidance
The navigation unit can calculate different routes to a selected destination. You have four options:
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