Approaching Vehicle Sound For Pedestrians (VSP) System

SYSTEM

APPROACHING VEHICLE SOUND FOR PEDESTRIANS(VSP) SYSTEM : System Description


SYSTEM DIAGRAM







SYSTEM DESCRIPTION

- The VSP system has the function of warning the driver of pedestrians approaching the vehicle, according to signals received from the combination meter and the stop lamp switch
- The VSP system consists of the following 3 types.
- Driving start sound
- Driving sound
- Reverse sound
- The VSP system operating status can be checked from the VSP warning lamp.
- The VSP system begins operating when the power switch is turned from OFF to READY.
- The VSP warning lamp turns ON when a malfunction occurs in the VSP system.

DRIVING START SOUND

The driving start sound operates when the selector lever is shifted to "D" position and the brake pedal is released (when READY to drive indicator lamp ON).
Operation Description
- The combination meter sends the following signals to the VSP control unit via the communication line.
- Shift position signal
- Vehicle speed signal
- READY to drive indicator lamp signal
- The VSP control unit judges the driving start sound based on the signals input from the combination meter and on the stop lamp switch signal input from the stop lamp switch.
- When the VSP control unit judges that the driving start sound is necessary, it outputs the VSP speaker signal to the VSP speaker.
- The system switches to the driving sound after the driving start sound time ends.
Operation Condition
The driving start sound operates when all of the following conditions are met.





Cancel Condition
The driving start sound operation stops when the following condition is met.





NOTE:
The system switches to the driving sound after the driving start sound time ends.
Signal Path
- The VSP control unit judges operation of the driving start sound function based on the signal shown below, and it operates the driving start sound.





- When the VSP control unit judges that the driving start sound is necessary, it outputs the signal shown below.





Timing Chart











DRIVING SOUND

- The driving sound is a function that operates according to the vehicle speed.
- The driving sound tone frequency changes in accordance with the vehicle speed.
Operation Description
- The combination meter sends the following signals to the VSP control unit via the communication line.
- Vehicle speed signal
- READY to drive indicator lamp signal
- The VSP control unit judges the driving sound based on the signals input from the combination meter.
- When the VSP control unit judges that the driving sound is necessary, it outputs the VSP speaker signal to the VSP speaker.
Operation Condition
The driving sound operates when the following conditions are met.





Cancel Condition
The driving sound operation stops when the following conditions are met.





Signal Path
- The VSP control unit judges operation of the driving sound function based on the signals shown below, and it operates the driving sound.





- When the VSP control unit judges that the driving sound is necessary, it outputs the signal shown below.





Timing Chart











REVERSE SOUND

The reverse sound operates when the selector lever is shifted to "R" position.
Operation Description
- The combination meter sends the following signals to the VSP control unit via the communication line.
- Shift position signal
- Reverse warning buzzer signal
- READY to drive indicator lamp signal
- The VSP control unit judges the reverse sound based on the signals input from the combination meter.
- When the VSP control unit judges that the reverse sound is necessary, it outputs the VSP speaker signal to the VSP speaker.
Operation Condition
The reverse sound operates when the following conditions are met.





Cancel Condition
The reverse sound operation stops when the following condition is met.





Signal Path
- The VSP control unit judges operation of the reverse sound based on the signals shown below, and operates the driving sound.





- When the VSP control unit judges that the reverse sound is necessary, it outputs the signal shown below.





Timing Chart











VSP SYSTEM MALFUNCTION DETECTION FUNCTION

When a malfunction in the VSP system is detected, the VSP warning lamp turns ON.
Signal Path
- When the VSP control unit detects a VSP system malfunction, it outputs the VSP warning lamp signal to the
VSP warning lamp.
- The VSP control unit turns the VSP warning lamp ON/OFF when the signal shown below is input.