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Chapter XI Parking Distance Control
I. Composition and structure of parking distance control
1. Basic principles:
A plurality of ultrasonic radar probes are arranged in tail part of car and connected with ultrasonic radar
controller. Through conducting and controlling by controller, the radar probe can calculate the distance to
detected object according to signal traveling time through transmitting and receiving ultrasonic signal.
Then it emits different sound according to distance to inform driver the distance from car to obstacle so
as to improve convenience and safety of backing.
2. Composition:
Central controller, parking sensor, alarm buzzer, etc
3. Structure drawing:
1) Mounting position of packing distance control ECU
4. Technical parameters:
Detection range: 0.4-1.5m. Detection angle of each sensor is 120°both leftwards and rightwards and
60°both upwards and downwards (a flame shaped region).
Ultrasonic wave frequency: 58k±1HZ
Working current: 200mA
Working voltage: 120VDC
II. Attentions for parking distance control repair
1. When parking distance control is in normal operation, buzzer emits “Pippica!” short high tone after
reverse gear is engaged to prompt that detection function of system is activated and operation is
normal.
2. If a probe is damaged or disconnected, “Pippica!” short high tone is emitted twice after reverse gear
is engaged.
3. If 2 or more probes are damaged or disconnected, “Pippica!” short high tone is emitted three times
after reverse gear is engaged.
4. If no “Pippica!” short high tone is emitted after reverse gear is engaged, the central controller or
buzzer of parking distance control is damaged or has circuit fault.
5. In case of any of above abnormal phenomena, inspect it by following steps:
1) Check whether probe has been disconnected from central controller.
2) Check all ultrasonic probes one by one to find out defective probes which shall be immediately
changed.
3) If phenomenon described in 4. appears, immediately replace central controller and buzzer.
III. Special attentions
In case of following conditions, system would give wrong judging information:
1. Diameter of detected object is too small, such as rope, steel wire, etc.
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