From 08/2009
PARK ASSIST / MONITORING: INTUITIVE PARKING ASSIST SYSTEM: SYSTEM DIAGRAM
Communication Table
* *1: w/o Side Monitor System
* *2: w/ Side Monitor System
* *3: w/ Navigation System
SYSTEM DESCRIPTION
1. GENERAL
(a) This system uses ultrasonic sensors to detect any obstacles at the corners and the 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 multi-information display (in the combination meter) and multi-display (w/ Navigation System) and by sounding a buzzer.
2. FUNCTION OF COMPONENTS
* *1: The buzzer does not sound when the power switch is on (IG) while the clearance main switch is on.
* *2: w/o Side Monitor System
* *3: w/ Side Monitor System
* *4: w/ Navigation System
3. OPERATION EXPLANATION
(a) The operating conditions of each ultrasonic sensor differ according to the installation position as shown in the table below.
(a) When the system operates, the clearance warning ECU*1 or parking assist ECU*2 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 clearance warning ECU.
Based on this information, the clearance warning ECU*1 or parking assist ECU*2 sends signals to the indicator and the clearance warning buzzer. The appropriate distance between the vehicle and the obstacle is then indicated, and the buzzer sounds.
* *1: w/o Side Monitor System
* *2: w/ Side Monitor System
HINT
Refer to Detection Range Measurement and Display Inspection Operation Check.
4. COMMUNICATION SIGNALS OF COMPONENTS
HINT
* Allocation refers to the process of the clearance warning ECU*1 or parking assist ECU*2 setting aside IDs for the sensors.
* The vehicle has the sensors arranged in 2 groups. There is a front series and a rear series. The sensors are connected in a "daisy chain".
* *1: w/o Side Monitor System
* *2: w/ Side Monitor System
(a) Initialization mode:
An ID is allocated to each sensor and sensor diagnosis is performed.
(1) When the initial check is operating (the power switch is on (IG) and the intuitive parking assist system is on), the clearance warning ECU*1 or parking assist ECU*2 provides power to the first sensors in each series (front left sensor and rear right sensor).
* *1: w/o Side Monitor System
* *2: w/ Side Monitor System
HINT
Refer to Self-check Function Inspection (Initial Check) Operation Check.
(2) After the power is supplied, the front left 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 sensor and rear right sensor receive the ID allocation signal from the ECU and perform self-diagnosis. When the sensor self-diagnosis is completed, the ECU sends an ID allocation confirmation signal to these sensors.
(4) After the ID allocation confirmation is performed, the ECU provides power to the second sensors in each series (front right sensor and rear right center sensor) via the first sensors. In the same manner as the first sensors, the second sensors enter 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 completed.
(b) Detection mode:
After initialization mode is completed, the system switches into detection mode. In detection mode, the clearance warning ECU*1 or parking assist ECU*2 sends information request signals and sensor activation signals to the ultrasonic sensors and receives detection result signals from the sensors.
* *1: w/o Side Monitor System
* *2: w/ Side Monitor System
(1) The ECU regularly sends ID signals, information request signals, and sensor activation signals to each ultrasonic sensor according to the communication schedule.
(2) When a certain amount of time has elapsed (sensor detection operation is completed), 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 performed repeatedly for each ultrasonic sensor.