Method for detecting and processing measured values of capacitive proximity sensors
A technology of proximity sensors and measurement values, which is used in the field of detection and processing of measurement values of capacitive proximity sensors, and can solve the problem that digital measurement values cannot be included in subsequent processing.
Active Publication Date: 2016-09-07
HUF HULSBECK & FURST GMBH & CO KG
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Problems solved by technology
Digital measured values previously acquired at a lower sampling rate cannot be included in subsequent processing
Method used
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[0019] The method according to the invention detects and processes measured values of capacitive proximity sensors arranged in the rear region of the motor vehicle. figure 1 A rear area 1 of a motor vehicle is shown, which has electrodes 2A and 2B of two capacitive proximity sensors in the area close to the ground (behind the visor). It preferably refers to a longitudinally extending sensor cable which runs transversely to the longitudinal direction of the vehicle, ie transversely to figure 1 The graphics extension. other in figure 1The device shown in is only marked on the outside of the motor vehicle for the sake of clarity, but it is actually arranged in the motor vehicle. An input cable 3 runs from the sensor electrodes 2A, 2B in each case towards an evaluation circuit 4A and 4B of the capacitive sensor, which generates an analog output signal at its output corresponding to the capacitance of the sensor, in particular a voltage corresponding to this capacitance. Volta...
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In a method for detecting and processing measurement values of at least one capacitive proximity sensor which is arranged in the rear region of a motor vehicle close to the ground and for initiating an operating function of a tailgate by a prespecified foot movement of an operator, a measurement value of the proximity sensor is periodically detected after in each case one scanning interval, and a digital measurement value which corresponds to the measurement value is stored in a FIFO memory. In a first, energy-saving evaluation mode, a filter value is calculated from the currently stored digital measurement value and a prespecified second number of previously stored digital measurement values, in each case after a prespecified first number of digital measurement values are stored, by each of said stored digital measurement values being multiplied by an associated first factor in each case and the results being added, the filter value being compared with the threshold value and a second evaluation mode being activated when the filter value exceeds the threshold value. In the second, normal evaluation mode, a filter value is calculated from the currently stored digital measurement value and a prespecified fourth number of previously stored digital measurement values, in each case after a prespecified third number of digital measurement values, which third number is smaller than the first number, are stored, by each of said digital measurement values being multiplied by an associated second factor in each case and the results being added, and the filter value being fed to an algorithm for identifying a signal profile which corresponds to the prespecified foot movement.
Description
technical field [0001] The invention relates to a method for detecting and processing measured values of at least one capacitive proximity sensor arranged in the ground-close rear region of a motor vehicle, wherein the measured values of the capacitive proximity sensor are detected periodically at sampling intervals in each case , and a digital measurement corresponding to this measurement is stored in the FIFO-memory, and this stored digital measurement is passed to an algorithm in order to recognize a signal trend that corresponds to a pre-set foot movement of the operator . Background technique [0002] It is known to arrange electrodes of capacitive sensors in the rear region of a motor vehicle close to the ground (for example behind a plastic visor) such that if an operator standing behind the motor vehicle is in the direction of the rear region and at the rear A brief swing of his foot beneath the region causes its capacitance to change relative to a reference pot...
Claims
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IPC IPC(8): B60R25/24B60R25/40
CPCE05F15/73E05Y2400/40E05Y2400/852E05Y2400/858E05Y2900/50E05Y2900/546
Inventor 贝特霍尔德·西格米尔科·辛德勒马库斯·菲尔鲁特皮特·克莱门斯
Owner HUF HULSBECK & FURST GMBH & CO KG