Acura CSX. Manual — part 597
*02
*03
−
−
Navigation Function
Function Diagram
Vehicle Speed Pulse
23-103
STEERING BUTTONS
MICROPHONE
GA Net bus
AUDIO UNIT
LCD
SWITCH
Destination
DVD ROM
YAW RATE SENSOR
GPS tuning
GPS RECEIVER
NAVIGATION UNIT
XM RECEIVER
GPS ANTENNA
Reception of radio
wave from satellite
Data pcocess
concerning map
and vehivle position
Perception of
vehicle position
ECM/PCM
(VEHICLE SPEED PULSE)
Detection of
travel distansce
Detection of
vehicle position
Detection of
direction change
Correction of
map matching
Map scroll
Change of reduced
scale of map
Guide
processing
Audio
guidance
NAVIGATION
DISPLAY
VOICE
PROMPTS
Sensor power
NAVIGATION UNIT
ECM/PCM
DISTANCE
DETECTION
CIRCUIT
The navigation system is composed of the navigation unit, the ECM/PCM (vehicle speed signal), the GPS antenna, the
microphone, the voice control switch, the XM receiver, and the climate control unit.
These units communicate with each other on the GA-Net bus.
The vehicle speed pulse is sent by the ECM/PCM. The ECM/PCM receives a signal from the countershaft speed sensor,
then it processes the signal, and transmits it to the speedometer and other systems.
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*04
GA-Net Bus Configuration
23-104
Navigation System
Navigation unit
XM Receiver
Accessory
(Music Link, CD changer etc.)
The GA-Net bus passes audio and navigation commands throughout the navigation and audio components.
These commands include audio/XM selections by voice, and XM station and music title names. Because the entire bus
is daisy chained between components (see diagram below), any open or short in the GA-Net bus harness will cause
any or all of these functions to become inoperative. The addition of any factory audio accessory must maintain the
continuity of the GA-Net bus by installing the Y cable included with the accessory kit.
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*05
Yaw Rate Sensor
Sensor Element Structure
Oscillation Gyro Principles
Operation
23-105
Enlarged view of sensor element
DETECTING PIEZOELECTRIC
PARTS
OSCILLATORS
SUPPORT PIN
DRIVING
PIEZOELECTRIC
PART
METAL BLOCK
MONITORING PIEZOELECTRIC
PART
Bend
Oscillation
Coriolis force
Turn to
right
Coriolis force
Oscillation
Sensor element top view
The yaw rate sensor (located in the navigation unit) detects the direction change (angular speed) of the vehicle. The
sensor is an oscillation gyro built into the navigation unit.
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 to monitor and maintain the oscillation
at a regular frequency, and two to detect angular velocity. The two oscillators, which have a 90-degree twist in the
center, are connected 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 piezoelectric part is attached to the bottom of the other oscillator.
The piezoelectric parts have electric/mechanical transfer characteristics. They 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.
1. The driving piezoelectric part oscillates the oscillator by repeatedly bending and returning when an AC voltage of
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 part 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 forward 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.
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*06
Global Positioning System (GPS)
Position Detection Image with GPS Satellite
Precision of GPS
GPS ICON
COLOR
NUMBER OF
SATELLITES
CONDITION
DESCRIPTION
GPS Antenna
GPS Receiver and Clock
23-106
Navigation System
The global positioning system (GPS) enables the navigation system to determine the current position of the vehicle by
using the signals transmitted from the satellites in orbit around the earth. The satellites transmit the satellite
identification signal, orbit information, transmission time signal, and other information. When the GPS receiver
receives a signal from four or more satellites simultaneously, it calculates the current position of the vehicle based on
the distance to each satellite and the satellite’s positions in its respective orbit.
The precision of the GPS varies according to the number of satellites from which signals are received and the view of
the sky. The accuracy is indicated by the color and shape of the GPS icon shown on the display.
No GPS icon
None
Faulty reception
The GPS can’t be utilized due to a faulty
GPS receiver, open in the wire, or other
fault or interference.
White GPS icon
2 or less
Impossible to detect vehicle
position
GPS function is normal. The satellite
signals received by the GPS are too few to
detect the vehicle position.
Green GPS icon
3
Vehicle position detectable in
2 dimensions
The longitude and latitude of the vehicle
position can be detected. (Less precise
than detection in three dimensions)
4 or more
Vehicle position detectable in
3 dimensions (elevation
displayed)
The longitude, latitude and the altitude of
the vehicle position can be detected. (More
precise than detection in two dimensions)
The GPS antenna amplifies and transmits the signals received from the satellites to the GPS receiver.
The GPS receiver is built into the navigation unit. It calculates the vehicle position by receiving the signal from the GPS
antenna. The current time vehicle position and signal reception condition is transmitted from the GPS receiver to the
navigation unit to adjust vehicle position.
08/08/21 14:06:28 61SNR030_230_0109
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