Sensitivity compensation method of parking auxiliary system

Abstract

The invention discloses a sensitivity compensation method of parking auxiliary system, which includes the following steps: A. pre-collecting sensitivity data of an ultrasonic sensor changing with temperature and getting an ordinary sensitivity-temperature curve; B. if in ideal echo gain remains unchanged while the ultrasonic sensor changing with the temperature, getting an ideal echo gain-temperature curve; C. analyzing and comparing the ordinary sensitivity-temperature curve and the ideal echo gain-temperature curve, calculating echo gain compensation coefficients in different environment temperatures, and getting an echo gain compensation coefficients-temperatures curve; D. in the actual application, a real-time collection of operating temperatures of the ultrasonic sensor is made and sent by a temperature sensor to a control unit, current echo gain compensation coefficients are obtained by the control unit according to the echo gain compensation coefficients-temperatures curve, thecurrent ordinary sensitivity is obtained by the control unit according to the ordinary sensitivity-temperature curve, and then multiplying the echo gain compensation coefficients to the current ordinary sensitivity to obtain the compensated operating sensitivity.

Description

technical field [0001] The invention belongs to the field of automobile parking assistance systems, in particular to a sensitivity compensation method of the parking assistance system. Background technique [0002] In recent years, with the process of automobile industrialization, the number of domestic automobiles has continued to rise. For the only parking spaces currently available, vehicles often deviate from parking due to human factors such as poor driving skills and bad parking habits. This will often increase the difficulty of parking for other cars, resulting in accidents such as collisions and frictions. In response to the above situation, various intelligent parking assistance systems have emerged as the times require. However, during the use of ultrasonic sensors used in parking assistance systems, the sensitivity is greatly affected by temperature, and the sensitivity becomes greater at low temperatures, which may easily cause system misjudgment. ; When the tem...

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Problems solved by technology

[0002] In recent years, with the process of automobile industrialization, the number of domestic automobiles has continued to rise. For the only parking spaces currently available, vehicles often deviate from parking due to human factors such as poor driving skills and bad parking habits. parking spaces or occupy multiple parking spaces, etc., which will often increase the difficulty of parking for other cars, resulting in accidents such as collisions and frictions between vehicles

In response to the above situation, various intelligent parking assistance systems have emerged as the times require. However, during the use of ultrasonic sensors used in parking assistance systems, the sensitivity is greatly affected by temperature, and the sensitivity becomes greater at low temperatures, which may easily cause system misjudgment. ; When the temperature is high, the sensitivity becomes smaller, and the distance measurement cannot meet the requirements, which often causes errors in the regulation commands issued by the parking assistance system, thus reducing the quality of automatic parking

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