[Previous][Next]
System Description
 
 
SYSTEM DIAGRAM
ComponentDescription
BCMSystem Description
ABS actuator and electric unit (control unit)ABS Actuator and Electric Unit (Control Unit)
Chassis control moduleChassis Control Module
PHEV-ECUGENERAL INFORMATION
Steering angle sensorSteering Angle Sensor
Combination meterSystem Description
Front camera unitFront Camera Unit
Head Up Display UnitHead Up Display Unit
ADAS control unit 2ADAS Control Unit 2
 
 
ADAS CONTROL UNIT 2 INPUT/OUTPUT SIGNAL ITEM
 
 
Input Signal Item
Transmit unitSignal nameDescription
BCMCAN communicationStop light switch signalReceives an operational state of the brake pedal
Brake pedal position switch signalReceives an operational state of the brake pedal
ABS actuator and electric unit (control unit)CAN communicationABS malfunction signalReceives a malfunction state of ABS
ABS operation signalReceives an operational state of ABS
ABS warning light signalReceives an ON/OFF state of ABS warning light
TCS malfunction signalReceives a malfunction state of TCS
TCS operation signalReceives an operational state of TCS
ASC OFF signalReceives an ON/OFF state of ASC
ASC malfunction signalReceives a malfunction state of ASC
ASC operation signalReceives an operational state of ASC
Vehicle speed signal (ABS)Receives wheel speeds of four wheels
Yaw rate signalReceives yaw rate acting on the vehicle
Side G sensor signalReceives lateral G acting on the vehicle
PHEV-ECUCAN communicationClosed throttle position signalReceives idle position state (ON/OFF)
Accelerator pedal position signalReceives accelerator pedal position (angle)
Engine speed signalReceives engine speed
Input speed signalReceives the number of revolutions of input shaft
Current gear position signalReceives a current gear position
Shift position signalReceives a selector lever position
Output shaft revolution signalReceives the number of revolutions of output shaft
Steering angle sensorCAN communicationSteering angle sensor malfunction signalReceives a malfunction state of steering angle sensor
Steering angle sensor signalReceives the number of revolutions, turning direction of the steering wheel
Steering angle speed signalReceives the turning angle speed of the steering wheel
Combination meterCAN communicationSystem selection signalReceives a selection state of each item selected with the information display
ACC/FCM-ECUCAN communicationACC/FCM-ECU signalReceives detection results, such as the presence or absence of a leading vehicle and distance from the vehicle
Front camera unitCAN communicationPedestrian ahead signalReceives detection results of pedestrian ahead of vehicle
Vehicle ahead signalReceives detection results of vehicle ahead
 
 
Output Signal Item
Reception unitSignal nameDescription
Combination meterCAN communicationMeter display signalTransmits a signal to display a state of the system on the information display
Buzzer output signalTransmits a signal to activate tone alarm
FCM warning light signal
  • Transmits a signal to turn ON the light
  • Transmits an ON/OFF state of the FCM
ACC/FCM-ECUCAN communicationVehicle speed signalTransmits a vehicle speed calculated by the ADAS control unit 2
Steering angle sensor signalTransmits a steering angle sensor signal received from the steering angle sensor
ABS actuator and electric unit (control unit) (via chassis control module)CAN communicationBrake fluid pressure control signalTransmits a brake fluid pressure control signal to activates the brake
BCMCAN communicationStop light request signalTransmits a signal to activates the stop light
PHEV-ECUCAN communicationWheel torque request signalTransmits a signal to control the engine torque
Head Up Display unitCAN communicationDisplay signalTransmits a signal to display a state of the system on the Head Up Display
Front camera unitCAN communicationVehicle speed signalTransmits a vehicle speed calculated by ADAS control unit 2
Turn indicator signalTransmits a turn indicator signal received from BCM
 
 
FUNCTION DESCRIPTION
  • The FCM system measures the distance from a vehicle ahead using the distance sensor installed in the front grill and front camera unit installed in the windshield glass.
  • The FCM system detects a pedestrian using the front camera unit installed in the windshield glass.
  • When the system judges that a vehicle or pedestrian is being approached, warning indicators are displayed on the information display and at the same time a warning chime sounds, and the brake is operated.
  • When it is further judged that the vehicle or pedestrian may collide with the vehicle ahead, the system operates the brake strongly to avoid collision while warning indicators are displayed on the information display and at the same time a warning chime sounds.
Start of warning and partial brakeStart of harder brake
Applies partial braking Harder brake
SituationBrakeWarning
No obstacle approachedNo operation—
Start of warning and partial brakePartial brake
  • Sounds the tone alarm
  • Indicates warning indicators on the information display
Start of harder brakeHarder brake
  • Sounds the tone alarm
    (Higher pitched tone alarm)
  • Indicates warning indicators on the information display
cautionIt is the driver′s responsibility to stay alert, drive safely and be in control of the vehicle at all times. As there is a performance limit, it may not provide a warning or brake in certain conditions.
 
 
OPERATION DESCRIPTION
  • The ACC/FCM-ECU measures the distance to the forward vehicle, and sends the forward vehicle signal and forward pedestrian signal and forward bicycle on which a person is riding signal to the ADAS control unit 2.
  • The ADAS control unit 2 judges the possibility of collision by receiving the forward vehicle signal, forward pedestrian signal and vehicle speed signal and forward bicycle on which a person is riding signal from the ACC/FCM-ECU.
  • The ADAS control unit 2 operates as follows according to the possibility of collision.
    Before light brake
    • It sends the warning tone alarm signal to the warning tone alarm, and the first warning tone alarm sounds.
    • It sends the meter display signal to the combination meter, and flashes the FCM display.
    Start of light brake
    • It sends the warning tone alarm signal to the warning tone alarm, and the second warning tone alarm sounds.
    • It sends the meter display signal to the combination meter, the emergency warning display is turned on.
    • It sends the brake fluid pressure indicating signal to the ABS actuator and electric unit (control unit), and activate the brake lightly.
    • It sends the stop light request signal to the BCM, and turns on the stop light.
    Start of emergency brake
    • It sends the warning tone alarm signal to the warning tone alarm, and the second warning tone alarm sounds.
    • It sends the meter display signal to the combination meter, the emergency warning display is turned on.
    • It sends the brake fluid pressure indicating signal to the ABS actuator and electric unit (control unit), and activate the brake heavily.
    • It sends the stop light request signal to the BCM, and turns on the stop light.
note
  • ON/OFF of FCM system is performed with the information display.
  • When the electric motor switch is turned from OFF to ON, the system is automatically activated even if it is OFF.
 
 
OPERATION CONDITION
ADAS control unit 2 performs the control when the following conditions are satisfied.
  • FCM system: ON
  • Vehicle speed (For vehicle): Approximately 10 km/h (6 MPH) or more
  • Vehicle speed (For pedestrian, bicycle on which a person is riding): Approximately 10 – 80 km/h (6 – 50 MPH)
  • When there is a possibility of a collision with the forward vehicle, pedestrian or bicycle on which a person is riding
 
 
CANCEL CONDITION
The ADAS control unit 2 release the control when any of the following conditions are met during system control.
  • When the system judges that the vehicle comes to a standstill by the system control.
  • When the system malfunction occurs.
  • When the distance sensor area of the front grill is dirty and the measurement of the distance between the vehicles becomes difficult. (For vehicle)
  • When the view of ahead is hard is recognized due to dirt around front camera unit of windshield. (For pedestrian)