Method and device for detecting automobile motion state by using acceleration sensor

Abstract

The invention discloses a method and a device for detecting an automobile motion state by using an acceleration sensor. The method comprises the following steps of: detecting an acceleration value of an automobile by using the acceleration sensor, wherein the acceleration value includes an X-axis acceleration value, a Y-axis acceleration value and a Z-axis acceleration value; acquiring an acceleration value within a preset time, and carrying out statistic and statistic analysis process on the acceleration value within the preset time, so as to obtain the statistic information within the preset time; matching the statistic information with a preset state model; and determining the state corresponding to the preset state model as the motion state of the automobile when the statistic information is matched with the preset state model. According to the embodiment of the invention, the automobile state is judged according to statistic characteristics of data output from the acceleration sensor, the possibility of misinformation or report miss is reduced, and moreover, a current operation speed value of the automobile can be estimated or the state that whether the door is opened or closed can be identified.

Description

technical field [0001] The invention relates to the technical field of vehicle detection, in particular to a method and a device for detecting the motion state of a vehicle by using an acceleration sensor. Background technique [0002] At present, vehicle anti-theft devices mostly use accelerometers to judge the state of the vehicle, and then perform positioning and alarm processing after the vehicle is found to be moving. The principle is mainly described as follows: use the gravitational accelerometer installed in the vehicle to detect the change of the vehicle's gravitational acceleration, when the acceleration change measured by the acceleration sensor exceeds the preset threshold, an abnormal signal is sent to indicate that the vehicle state has changed judge. There are two problems in this method in actual use: First, there are certain difficulties in the selection of the preset threshold value. If the selection is too low, false alarms are prone to occur, that is, th...

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Problems solved by technology

There are two problems in this method in actual use: First, there are certain difficulties in the selection of the preset threshold value. If the selection is too low, false alarms are prone to occur, that is, the vehicle does not actually move but triggers an abnormal signal (such as strong wind, etc.). The situation causes the vehicle to shake); if the selection is too high, it is easy to miss the report, such as the vehicle moves slowly and fails to trigger the abnormal signal

Second, this method can only judge the state change of the vehicle from a stationary state to a moving state, and cannot judge the state of the vehicle speed, opening and closing the door, or a sudden collision, so the use is relatively limited

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