System Description
PARK ASSIST / MONITORING: INTUITIVE PARKING ASSIST SYSTEM: SYSTEM DESCRIPTION
1. GENERAL
(a) This system uses ultrasonic sensors to detect any obstacles at the front and rear of the vehicle. The system then informs the driver of the distance between the sensors and the obstacles as well as their positions by indicating them on the display and navigation module display or multi-information display and by sounding a buzzer.
2. FUNCTION OF COMPONENTS
HINT
*1: w/o Advanced parking guidance system
*2: w/ Advanced parking guidance system
3. OPERATION EXPLANATION
(a) The ECU determines whether the intuitive parking assist system should be operated based on the clearance sonar main switch ON/OFF status, the shift position and the vehicle speed.
(b) When the system operates, the ECU transmits ultrasonic waves from the ultrasonic sensors. If these waves encounter an obstacle within one or more of the sensors' ranges, the waves are reflected back to the sensors, which transmit them to the ECU. Based on this information, the ECU sends signals to the multi-information display, the multi-display and the clearance warning buzzer. The approximate distance between the vehicle and the obstacle is then indicated, and the buzzer sounds.
HINT
Refer to "OPERATION CHECK" for the detailed operation Operation Check.
4. ECU OR SENSORS WHICH COMMUNICATE THROUGH SENSOR COMMUNICATION
HINT
* The ECU and sensors communicate with each other using sensor communication.
* Allocation refers to the process of the ECU setting aside IDs for the sensors.
* The vehicle has the sensors arranged in 2 groups*1 or 3 groups*2. There is a front series and a rear series. The sensors are connected in a "daisy chain".
HINT
*1: w/o Advanced parking guidance system
*2: w/ Advanced parking guidance system
(a) Initialization mode:
An ID is allocated to each sensor and sensor diagnosis is performed.
HINT
*1: w/o Advanced parking guidance system
*2: w/ Advanced parking guidance system
(1) When any of the following conditions are met, the ECU provides power to the first sensors in each series (front left side sensor*1, front left corner sensor*2 and rear right corner sensor):
* The engine switch is turned on (IG).
* The sensor operating conditions (described previously) are met and the clearance sonar main switch is turned ON.
* Vehicle speed is below 9 km/h (5.6 mph).
(2) After power is supplied, front left side sensor and rear right sensor enter standby mode to receive an ID from the ECU. When a certain amount of time has elapsed, the ECU sends an ID allocation signal to these sensors.
(3) The front left side sensor and rear right sensor receive the ID allocation signal from the ECU and perform self-diagnosis. When the sensor self-diagnosis is complete, the ECU sends an ID allocation confirmation signal to the sensors.
(4) After the ID allocation confirmation is performed, the ECU provides power to the second sensors in each series (front left corner sensor*1, front left center sensor*2 and rear right center sensor) via the first sensors. In the same manner as the first sensors, the second sensors enter the standby mode. When a certain amount of time has elapsed, the ECU sends an ID allocation signal to the second sensors.
(5) The above operation will be repeated until an ID is allocated to the last sensor, which is in the rear series (rear left sensor). Initialization ends when ID allocation to all ultrasonic sensors is complete.
(b) Detection mode:
After the initialization mode is complete, the system switches into the detection mode. In the detection mode, the ECU sends information request signals and sensor activation signals to the ultrasonic sensors and receives detection result signals from the sensors.
(1) The ECU regularly sends ID signals, information request signals, and sensor activation signals to an ultrasonic sensor according to the sensor communication schedule.
(2) When a certain amount of time has elapsed (sensor detection operation is complete), the ECU sends an ID signal to the sensor to receive a detection result signal.
(3) The ultrasonic sensor sends a detection result signal or detection information signal to the ECU.
(4) The above operation is repeatedly performed for each ultrasonic sensor.