Hongqi HS7 Manual page 199

CAUTIONS
Pay special attention to the people animals, and various obstacles around the
■
vehicle. The sensors have undetectable blind spots.
■ When searching for parking space or during parking, make sure there are no
obstacles, such as stones, fine columns or draw bars, in the parking space before
parking your vehicle in it, as the Park Assist may not detect such obstacles.
■ The Park Assist may not be able to recognize the surface or structure of some
objects (such as barbed wire fences, fluffy snow, etc.). Therefore, check whether
there is enough space in the parking space displayed before parking your vehicle.
■ If the parking radar system detects a barrier, the barrier may get out of the
detection range of the sensor when the vehicle gets close to the barrier (the
case extremely easily occurs when too high and too low barriers are detected),
therefore, these objects are not detected. Do not ignore the alarm from the parking
distance warning system. Otherwise, the vehicle may be at risk of collision.
■ Due to the influences of various external sound fields and electromagnetic
fields (e.g., other vehicles using ultrasonic ranging, air pressure, engine noise,
electronically controlled gears and induction coils), the system cannot achieve
absolute anti-jamming.
■ The anti-jamming capability and detection performance of the ultrasonic ranging
system may be degraded due to environmental conditions and obstacle reflection
characteristics, and this is determined by the physical properties of ultrasonic
propagation.
■ The mounting position of the sensor has an important influence on the system
performance. This is reflected in the reflection of the bumper surface, the reflection
of the ground echo and the detection range.
■ Avoid cleaning the sensor with high-pressure cleaner or steam cleaner, so as to
avoid damage to the sensor. Adopt small water stream to wash the sensor surface
for a short time during vehicle cleaning, and maintain a distance over 10cm.
■ The sound waves transmitting in the air is refracted and diffracted based on the
physical properties. The difference in temperature in the air is one of the most
important factors in the generation of non-uniform propagation media, thereby
leading to acoustic diffraction.
■ The detection performance of ultrasonic detection equipment can be affected by
the following factors:
● Hot.exhaust.gas.
● High-temperature.asphalt.pavement.
● Summer.breeze.
● Temperature.stratification.
■ When the bumper temperature is different from the ambient air temperature (usually
occurring in winter), temperature stratification occurs, resulting in acoustic wave
diffraction. Echoes are generated in some bumper structures, so that there is a risk
of false alarms.
■ Some important factors that can lead to a reduced detection range or no detection:
● The.bumper.surface.is.covered.with.snow.or.sludge.
● The.sensor.surface.is.covered.with.lime.mud.or.ice.
● High.acoustic.attenuation.(for.example,.in.a.dry.and.hot.environment).
● In.heavy.rain.or.foam.
● Obstructions.with.absorbing.materials.
● Flat.obstacle.facing.the.sensor,.and.echoes.only.occur.within.a.specific.range.of.angle.
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