System Description
SYSTEM
MULTI AV SYSTEM : System Description
- AV control unit is connected to the following parts. It performs power supply, signal input and communication, and it controls the multi-AV system.
- GPS antenna
- Radio antenna (radio antenna amplifier)
- Rear view camera
- USB connector
- BCM
- VCM
- Combination meter
- Steering switch
- Multifunction switch
- Microphone
- TCU
- Speakers
- Vehicle signals (reverse signal, vehicle speed signal and illumination signal)
- Data of external device connected to the USB connector is played and transferred.
- When the reverse signal is input, power is supplied to the rear view camera. Image of the rear view camera is input to show the rear view monitor image on the display.
- Dimming signal is input from BCM to adjust the brightness of the display.
COMMUNICATION SIGNAL
AV control unit is connected to TCU via USB communication, and it receives the Telematics information received by TCU and gives the display and sound output. Telematics operation signals and sound signals are also sent to TCU.
Auto light adjustment function
Auto light adjustment function automatically dims/brightens the display according to the ambient light when the lighting switch is in the 1st or 2nd position. Whether or not the display is dimmed when the lighting switch is in the 1st position or 2nd position is determined by the output condition of the dimming signal output from the
BCM to the AV control unit. Even if the lighting switch is in the 1st position or 2nd position, the display may not be dimmed depending on the ambient light sensed by the auto light sensor. For details, refer to "ILLUMINATION CONTROL SYSTEM : System Description" Illumination Control System.
CAN COMMUNICATION
- AV control unit is connected via CAN communication, receives data signal from VCM and combination meter, and indicates power consumption information, etc. on the display based on the information obtained.
- The AV control unit, which has the vehicle setting function, transmits and receives data on vehicle setting condition via CAN communication with the BCM.
- AV control unit receives steering angle signal from steering angle sensor via CAN communication and performs control of possible route line in rear view monitor image.
- AV control unit receives and sends signals necessary for timer charge and A/C-heater timer operation with
VCM via CAN communication.
Energy Flow Display Function
The AV control unit receives data signals from the VCM and combination meter via CAN communication and computes each value using the obtained information to display it.
Vehicle Setting Function
The AV control unit transmits and receives data signals via CAN communication with the BCM, allowing the following vehicle settings.
- To turn on the automatic interior room lamp (ON/OFF) when the door is unlocked
- To adjust the auto light sensitivity (+/)
- To operate the intermittent wiper linked with the vehicle speed (ON/OFF)
- Vehicle setting initialization
NOTE:
The setting items vary depending on the vehicle specification
TYPE OF VOICE SIGNAL
Reception Voice Signal
- Hands-free phone reception voice is output from the cellular phone through the AV control unit to the front speaker via Bluetooth� communication.
- If the hands-free phone is used while the audio is ON and/or the voice guidance is being output, these sounds are muted and only the reception voice is output.
Speech Sound Signal
Hands-free phone speech sound is transmitted from the microphone via the AV control unit and Bluetooth�
communication to the cellular phone.
CARWINGS Reading Voice Signal
- In the case of the CARWINGS reading voice, the AV control unit receives text data from the NISSAN CARWINGS Data Center through the USB harness and outputs them to the front speaker.
- If CARWINGS data is read while the audio is ON and/or the voice guidance is being output, these audio sounds are muted and only the CARWINGS reading voice is output.
- Depending on the information from the NISSAN CARWINGS Data Center, not only the CARWINGS reading voice but also background music may be output. In this case, audio output of the front speaker is turned down 10 dB and then the CARWINGS reading voice is output.
Guide Sound Signal
- Voice signals output during the route guidance of the navigation system are output from the AV control unit to the front speaker.
- If the voice guidance is output with the audio ON, audio output of the front speaker is turned down 10 dB and then voice guidance is output.
- Adjusting the volume while the voice guidance is being output can change the volume of the guidance.
AUDIO FUNCTION
- The MP3/WMA playback function enables music to play for a long time: the user need not change the CD
during a long trip. The text display function is also adopted so that the title name and artist name of the ID3
tag/WMA tag can be displayed.
- Bluetooth�audio function is adopted to play music data in the portable audio via wireless communication.
- The adoption of the vehicle speed interlock sound volume function reduces the burden of the volume adjustment by the difference between the noises when the vehicle is stopped or running. In addition, the vehicle speed interlock sound volume function can perform ON/OFF setting and sound volume adjustment on a scale of one to five.
MP3/WMA Playback Function
This function enables the playback of compressed music files, such as MP3 music files used for the most widespread broadband music distribution and WMA music files played back with a music player generally built in Windows� personal computers.
NOTE:
- MP3 stands for MPEG AUDIO LAYER3. It is the compression standard defined by "MPEG", a joint activity organization of ISO and IEC (the international standardization groups).
- WMA stands for Windows Media Audio. It is the sound data compression standard formulated by Microsoft
Corporation.
Playable data
Vehicle Speed Interlock Volume Function
- The AV control unit receives the vehicle speed signal from the combination meter via CAN communication and changes the sound volume in conjunction with the vehicle speed.
- Using the vehicle speed interlock sound volume function, ON/OFF setting can be carried out as preferred by users, and sound volume variation caused by vehicle speed change can be adjusted on a scale of one to three.
Bluetooth�Audio Function
- Bluetooth�audio function is adopted to play music data in the portable audio in wireless communication.
- Five units of Bluetooth� communication devices including audio devices and cellular phones can be registered to the AV control unit.
- When the Bluetooth� audio is connected to the portable audio through Bluetooth�, it can play the music data in the portable audio.
- When the Bluetooth� audio is playing the data, operations of the other applications are as shown in the following table.
Bluetooth� compliant profile
Satellite Radio
- Satellite radio tuner is built into AV control unit.
- Audio signal and data signal (satellite radio) are received by satellite antenna. There are input to AV control unit. AV control unit outputs audio signal to each speaker and data signal to display unit.
USB CONNECTING FUNCTION
USB connector enables iPod� compliant and playback of music files in the USB memory.
*: iPod� is the trademark of Apple Inc. registered in the United States and other countries.
iPod� Compliant
- By connecting a user's iPod�to the USB connector, music can be played.
- While iPod�is connected, iPod�is charged.
- It is compliant with various playback methods.
NOTE:
- Use the USB cable that comes with the iPod�.
- The system supports no display of static and motion pictures.
- It is updated to the latest firmware before use.
Playback method type
USB Memory
- A music file recorded in the USB can be played.
- It is compliant with the playback method such as designation of folder or file. Setting of voice and subtitle is allowed.
- Compliant USB memory and data recorded are limited.
Compliant USB memory
NOTE:
- USB memory cannot be formatted.
- The system supports no display of static and motion pictures.
- A USB device that has multiple partitions may not be used.
- File that is encrypted or copy protected cannot be played.
Playable data
Setting Item
NAVIGATION SYSTEM FUNCTION
Description
- The AV control unit controls navigation function while GPS tuner has built-in map data, GYRO (angle speed sensor), on the SD card.
- The AV control unit inputs operation signal with communication signal, through front display unit (touch panel) and multifunction switch and steering switch.
- Guide sound is output to front speaker through from AV control unit when operating navigation system.
- A vehicle position is calculated with the GYRO (angle speed sensor), vehicle sensor, signal from GPS satellite and map data stored on SD card, and transmits the map image signal (RGB image, RGB area, RGB
image synchronizing) to the display.
Position Detection Principle
The navigation system periodically calculates the current vehicle position according to the following three types of signals.
- Travel distance of the vehicle as determined by the vehicle speed sensor
- Vehicle turning angle determined by the gyroscope (angular speed sensor)
- The travel direction of the vehicle determined by the GPS antenna (GPS information)
The current position of the vehicle is then identified by comparing the calculated vehicle position with map data, which is stored in the SD
card (map-matching), and indicated on the screen with a current location mark. More accurate data is used by comparing position detection results from GPS to the map-matching.
The current position is calculated by detecting the travel distance from the previous calculation point, and its direction change.
- Travel distance
The travel distance is generated from the vehicle speed sensor input signal. The automatic distance correction function is adopted for preventing a miss-detection of the travel distance because of tire wear etc.
- Travel direction
The gyroscope (angular velocity sensor) and GPS antenna (GPS
information) generate the change of the travel direction. Both have advantages and disadvantages as per the following descriptions.
Input signals are prioritized in each situation. However, this order of priority may change in accordance with more detailed travel conditions so that the travel direction is detected more accurately.
Map-matching
Map-matching repositions the vehicle on the road map when a new location is judged to be more accurate. This is done by comparing the current vehicle position (calculated by the normal position detection method) from the map data stored in the SD card.
There is a possibility that the vehicle position may not be corrected in the following case, and when vehicle is driven over a certain distance or time in which GPS information is hard to receive. Correct manually the current location mark on the screen.
- In map-matching, several alternative routes are prepared and prioritized in addition to the road judged as currently driving on.
Therefore, due to errors in the distance and/or direction, an incorrect road may be prioritized, and the current location mark may be repositioned to the incorrect road.
If two roads are running in parallel, they are of the same priority.
Therefore, the current location mark may appear on either of them alternately, depending on maneuvering of the steering wheel and configuration of the road, etc.
- Map-matching does not function correctly when road on which the vehicle is driving is new, etc. and not recorded in the map data.
Also, map-matching does not function correctly when road pattern stored in the map data and the actual road pattern are different due to repair, etc.
Therefore, the map-matching function judges other road as a currently driving road if the road is not in the map, and displays the current location mark on it. Later, the current location mark may be repositioned to the road if the correct road is detected.
- Effective range for comparing the vehicle position and travel direction calculated by the distance and direction with the road data is limited. Therefore, correction by map-matching is not possible when there is an excessive gap between current vehicle position and the position on the map.
GPS (Global Positioning System)
GPS (Global Positioning System) is developed for and is controlled by the US Department of Defense. The system utilizes GPS satellites (NAVSTAR), transmitting out radio waves while flying on an orbit around the earth at an altitude of approximately 21,000 km (13,049
mile).
The receiver calculates the travel position in three dimensions (latitude/longitude/altitude) according to the time lag of the radio waves that four or more GPS satellites transmit (three-dimensional positioning). The GPS receiver calculates the travel position in two dimensions (latitude/longitude) with the previous altitude data if the GPS
receiver receives only three radio waves (two-dimensional positioning). GPS position correction is not performed while stopping the vehicle.
Accuracy of the GPS will deteriorate under the following conditions:
- In two-dimensional positioning, GPS accuracy will deteriorate when altitude of the vehicle position changes.
- The position of GPS satellite affects GPS detection precision. The position detection may not be precisely performed.
- The position detection is not performed if GPS receiver does not receive radio waves from GPS satellites.
(Inside a tunnel, parking in a building, under an elevated highway etc.) GPS receiver may not receive radio waves from GPS satellites if any object is placed on the GPS antenna.
NOTE:
- The detection result has an error of approximately 10 m (32.81 ft) even with a high-precision three dimensional positioning.
- There may be cases when the accuracy is lowered and radio waves are stopped intentionally because the
GPS satellite signal is controlled by the US trace control center.
BLUETOOTH� HANDS-FREE PHONE FUNCTION
- When the cellular phone is connected to the AV control unit in Bluetooth� communication, hands-free phone communication can be performed.
- Simply operating the steering switch without releasing hands from the steering wheel allows the driver to make a phone call or receive a phone call.
- For the available cellular phone support model, refer to "Compliant model list" on the CARWINGS site.
- When a Bluetooth� communication compliant phone is registered to the AV control unit, hands-free phone communication can be performed. Five units of Bluetooth� communication devices including audio devices and cellular phones can be registered to the AV control unit.
- The content of the memory (telephone book) of the cellular phone can be recorded in the AV control unit.
Bluetooth� compliant profile
REAR VIEW MONITOR FUNCTION
Operation Description
- When the selector lever is shifted to the reverse position, the rear view monitor image is displayed.
- When the selector lever is shifted to any position other than the reverse position, the original image (the image displayed before the rear view monitor image) is displayed.
Camera Image Operation Principle
- The AV control unit that receives the reverse signal input supplies power to the rear view camera and gives input of image signal.
- The AV control unit outputs the rear view camera image to the display when the reverse signal is inputted.
- The AV control unit generates the warning message, side distance guiding lines and the possible route lines on the image from the rear view camera, and transmits the rear view camera image signal to the front display unit.
Side Distance Guide Lines and Possible Route Lines Display Function at Rear View Monitor Display
- The side distance guide lines and the possible route lines that indicate the vehicle route according to the steering angle are displayed at the rear view monitor display to allow the driver to more easily judge distances between the vehicle and objects and help the driver back into a parking space.
- The AV control unit receives the steering signal from the steering sensor via CAN communication and draws a possible route line according to the steering angle.
- When the possible route lines are displayed, the side distance guide lines are displayed translucently.
- The possible route lines are not displayed when the steering is in the neutral position.
- The possible route line can be displayed/not displayed by selecting "Other Settings" - "Camera from the setting function".
Precautions for Side Distance Guide Lines and Possible Route Lines Display on the Rear View Monitor Display
Side distance guide lines and possible route lines on the display may be different from actual lines depending on vehicle conditions and road conditions.
- Since guide lines and possible route lines are drawn based on the road, a different distance may be displayed if a protruding block is present nearby.
- Since guide lines and possible route lines are drawn based on the road, a different distance may be displayed if a protruding block is present nearby.
VOICE RECOGNITION FUNCTION
- By speaking a command, operations of navigation and hands-free phone can be performed.
- To perform the voice control, press the switch of the steering switch. The system changes to the speech reception status. When a command is spoken, the speech recognition result is displayed, and the operation is executed.
- The voice control cannot be performed under the conditions listed below.
- When the hand-free phone is used
- When the vehicle is moving backwards
Major Functions
With this function, the list of commands used for telephone, and navigation operation can be checked.
TIMER CHARGE AND A/C-HEATER TIMER FUNCTION
- Time for timer charge and A/C-heater timer can be set from the navigation setting screen.
- The AV control unit sends the current time signal received with GPS antenna to VCM via CAN communication, and it compensates the current VCM time.
Timer Charge Function
- Set the timer charge start time on the navigation setting screen. When the charging plug is connected, the time mode is activated.
- If the charging plug fitting is not sufficient, unplugged status is notified. For details of unplugged status notification, refer to "TELEMATICS SYSTEM : System Description" System Description.
- After the power switch is OFF, VCM is activated at the set charge start time and charge is started. (The time of the timer function is controlled by VCM.)
- VCM sends the VCM status signal and VCM wake-up signal to TCU via CAN communication to notify that
VCM is activated. For details of the charging function, refer to "System Description" System Description.
- Charge is completed.
NOTE:
Information of charge completion sent to the user is also given if charge is abnormally completed for some reason (e.g. disconnection of charging plug).
A/C-Heater Timer Function
- Set the A/C-heater timer start time on the navigation setting screen. When the charging plug is connected, the time mode is activated.
- After the power switch is OFF, VCM is activated at the set air conditioning start time and air conditioning is started. (The time of the timer function is controlled by VCM.)
- VCM sends the VCM status signal and VCM wake-up signal to TCU via CAN communication to notify that
VCM is activated. For details of air conditioner system, refer to "REFRIGERATION SYSTEM : System Description" System Description.
NOTE:
- A/C-heater timer performs air conditioning with the settings of temperature 25�C, AUTO, fan AUTO and
REC.
- Power consumption of the compressor or the PTC heater is limited according to allowable power from VCM.
Sufficient air conditioning may not be performed if charge has priority or 100 V charge is performed.