Parking sensors are proximity sensors for road vehicles made to alert the driver to obstacles while parking. These units, which use either electromagnetic or ultrasonic sensors, are sold variously by vehicle manufacturers under proprietary brand names for example Park Distance Control, Park Assist, parktronic or parktronik.
These systems feature ultrasonic proximity detectors to measure the distances to close by objects via sensors located in the front and/or rear bumper fascias or visually lessened within adjacent grills or recesses.
The sensors emit acoustic pulses, with a control system measuring the return interval of each reflected signal and determining object distances. The system in turns warns the driver with acoustic sounds, the frequency indicating object distance, with quicker tones showing closer proximity and a continuous tone indicating a minimal pre-defined distance. Systems may additionally include visual aids, such as LED or LCD readouts to indicate object range. An automobile might include a vehicle pictogram on the car's infotainment screen, with a representation of the nearby objects as coloured blocks.
Rear sensors may be activated as reverse gear is selected and deactivated as soon as any other gear is chosen. Front sensors may be activated personally by hand and deactivated automatically when the automobile reaches a pre-determined speed - to avoid subsequent nuisance warnings.
As an ultrasonic systems relies on the reflection of sound waves, the device may not detect flat objects or object insufficiently substantial to reflect sound - e.g., a narrow pole or a longitudinal object pointed directly at the car or near an object. Objects with flat surfaces angled from the vertical may deflect return sound waves away from the sensors, hindering detection.
Electromagnetic sensors parktronik 4 senzora rely on the vehicle moving slowly and smoothly towards the object to be prevented. Once detected, the hindrance, if the automobile momentarily stops on its approach, the sensor continues to give signal of presence of the obstacle. If the automobile then resumes its manoeuvre the alarm signal becomes more and more impressive as the obstacle approaches. Electromagnetic parking sensors are usually sold as not requiring any holes to be drilled offering a special design that discreetly mounts on the inner side of the bumper preserving the 'new factory look' of your automobile
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