Ô tô Camry 3.5Q - Phần 1 - P77
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BODY ELECTRICAL – PRE-CRASH SAFETY SYSTEM
02KBE200TE
km/h (mph)
50 (31)
40 (25)
30 (20)
20 (13)
10 (6)
Vehicle
Speed
A A and B
B
10
(6)
20
(13)
30
(20)
40
(25)
50
(31)
60
(37)
km/h
(mph)
Oncoming Vehicle Relative Speed
BE-212
JSYSTEM OPERATION
1. General
The pre-crash safety system consists of the following three operations: a pre-crash safety (unavoidable
collision) operation, front or rear wheel skid tendency operation and sudden braking operation. The impact
dampening components consists of the operation ranges indicated below.
Range
Operation Operation Condition Impact Dampening Component
A
Front or Rear
Wheel Skid
Tendency
Operation
D Power source is IG-ON.
D Seat belt is buckled.
D Vehicle speed is approx. 15 km/h
D Seat Belt Retracting Operation
Sudden Braking
Operation
ppp
(10 mph) or above.
B
Pre-crash safety
Operation
D Power source is IG-ON.
D Seat belt is buckled.
D Vehicle Speed is approx. 0 km/h
(0 mph) or above.
D Oncoming vehicle relative speed
is approx. 30 km/h (20 mph) or
above.
D Seat Belt Retracting Operation
D Brake Assist Standby Condition
BE
BODY ELECTRICAL – PRE-CRASH SAFETY SYSTEM
02KBE59Y
Steering Angle
Sensor
CAN
(CAN No.1 Bus)
Yaw Rate &
Deceleration Sensor
Speed
Sensor (4)
1)
Skid Control
ECU
1)1)
1)
2)
3)
Front Seat Inner Belt
Buckle Switch
(Driver)
Buckle Switch
(Front Passenger)
CAN Gateway ECU
CAN (CAN No.2 Bus)
2), 3)
Seat Belt
Control ECU
3) 3)
Seat Belt Motor
(Driver)
Seat Belt Motor
(Front Passenger)
Front Seat Outer Belt
BE-213
2. Front or Rear Wheel Skid Tendency Operation
1) While the vehicle is traveling at approx. 15 km/h (10 mph) or above, the skid control ECU determines
the front or rear wheel skid tendency condition based on the signals from the steering angle sensor, yaw
rate & deceleration sensor and speed sensors.
2) The skid control ECU outputs a seat belt operation request signal to the seat belt control ECU.
3) The seat belt control ECU determines the seat belt motor operation conditions based on this signal and the
seat belt buckle switch signal. Then, it retracts slack in the seat belts by operating the seat belt motors.
4) The seat belts return to a normal state when the relevant conditions of the vehicle have stabilized.
BODY ELECTRICAL – PRE-CRASH SAFETY SYSTEM
02KBE60Y
Stop Light Switch
Speed Sensor (4)
Master Cylinder
Pressure Sensor
Pump Motor
Brake Actuator
1)
1)
1)
3)
Skid Control
ECU
CAN
(CAN No.1 Bus)
4)
Front Seat Inner Belt
Buckle Switch
(Driver)
Buckle Switch
(Front Passenger)
CAN Gateway
ECU
CAN (CAN No.2 Bus)
2)
Seat Belt
Control ECU
4) 4)
Seat Belt
Motor (Driver)
Seat Belt Motor
(Front Passenger)
Front Seat Outer Belt
BE-214
3. Sudden Braking Operation
1) While the vehicle is traveling at approx. 15 km/h (10 mph) or above, the skid control ECU can determine
a sudden braking condition based on the signals from the master cylinder pressure sensor, stop light switch
and speed sensors.
2) At this time, the skid control ECU outputs a seat belt operation request signal to the seat belt control ECU.
3) Brake assist control enters standby mode according to the determination of the skid control ECU.
4) The seat belt control ECU determines the seat belt motor operation conditions based on this signal and the
seat belt buckle switch signal. Then, it retracts slack in the seat belts by operating the seat belt motors.
5) The seat belts return to a normal state when the brake pedal is released.
BE
BODY ELECTRICAL – PRE-CRASH SAFETY SYSTEM
02KBE61Y
Millimeter Wave
Radar Sensor
Serial Communication
1)
Distance
Control
ECU
1)
2)
1)
CAN
(CAN No.2 Bus)
2), 3)
Seat
Belt
Control
ECU
3)
3)
Front Seat Outer Belt
Seat Belt Motor
(Driver)
Seat Belt Motor
(Front Passenger)
CAN Gateway ECU
Yaw Rate &
Deceleration Sensor
1)1)
Steering Angle
Sensor
Stop Light Switch
Speed Sensor (4)
Master Cylinder
Pressure Sensor
Pump Motor
Brake Actuator
5)
1)
5)
5)
Skid
Control
ECU
2), 4)
CAN
(CAN No.1 Bus)
3)
Front Seat Inner Belt
Buckle Switch
(Driver)
Buckle Switch
(Front Passenger)
BE-215
4. Pre-crash safety Operation
1) The distance control ECU determines that an unavoidable collision condition exists based on the signals
received from the millimeter wave radar sensor, speed sensor, steering angle sensor, and yaw rate &
deceleration sensor.
2) At this time, the distance control ECU outputs a seat belt operation request signal to the seat belt control
ECU, a brake assist standby request signal to the skid control ECU.
3) The seat belt control ECU determines the seat belt motor operation condition based on this signal and the
seat belt buckle switch signal, and retracts the slack in the seat belts by operating the seat belt motors.
4) Upon receiving this signal, the skid control ECU switches the brake assist to the standby mode.
5) When the brake assist is in the standby mode and the stop light switch ON signal is input into the skid
control ECU, this ECU operates the brake assist based on the master cylinder pressure sensor signal.
6) If no collision occurs, the seat belts and the brake assist will return to their normal states.
