Method for Auxiliary Detection of Vehicle Speed in Parking Conditions by Acceleration Sensor
An acceleration sensor and auxiliary detection technology, which is applied in the field of automobile auxiliary parking system, can solve the problems of serious accidents, large errors in vehicle speed acquisition, parking failure, etc., and achieve the effect of improving the success rate and reducing the probability of accidents
Active Publication Date: 2014-10-29
JIANGSU UNIV
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[0003] The purpose of the present invention is to solve the problem that the vehicle speed acquisition error caused by the existing vehicle auxiliary parking system during the parking process is relatively large, and eventually the vehicle position calculation error exceeds the allowable range, resulting in parking failure or serious accidents , a device and method for detecting vehicle speed under parking conditions with the assistance of an acceleration sensor is proposed, which can obtain more accurate real-time vehicle speed information, thereby obtaining accurate vehicle position and realizing reliable parking
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[0016] Such as figure 1 and figure 2 As shown, the two-axis acceleration sensor 1 is installed inside the vehicle 14, figure 1 Among them, the vehicle 14 posture is shown by the left front steering wheel 10, the right front steering wheel 11, the left rear steering wheel 12, and the right rear steering wheel 13. The installation position of the two-axis acceleration sensor 1 is: on the horizontal plane where the stationary vehicle is located, the Y-axis is parallel to the left and right horizontal axes of the vehicle, the X-axis is parallel to the front and rear horizontal axes of the vehicle, and the intersection point O of the X-axis and the Y-axis is the two-axis acceleration sensor 1 is the center of the installation position on the horizontal plane. The output of the two-axis acceleration sensor 1 is connected to the input of the signal filter processing circuit 2 , the output of the signal filter processing circuit 2 is connected to the signal processing unit 3 (DSP) ...
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The invention discloses a device and a method for detecting vehicle speed on parking condition with assistance of an acceleration sensor. The method includes that a two-axis acceleration sensor is arranged in a car and on a horizontal plane of the same, an output of the sensor is connected with a signal processing unit after being processed by signal filtering, and the signal processing unit is connected with a vehicle speed sensor; when speed value Vi detected by the vehicle speed sensor and acquired by the two-axis acceleration sensor is larger than zero and smaller than 20km / h, instant acceleration value Xj and Yj of the two-axis acceleration sensor in a direction of an X axis and in a direction of a Y axis is acquired, and instant speed Vx and Vy and instant vehicle speed Vj in each direction can be calculated; and validity of Vj value is judged and processed by means of recursion average filtering to acquire effective speed value Nj', and final speed value VC of the effective speed value Nj' and the speed value Vi are acquired through weighed average. With the device and the method for detecting the vehicle speed on the parking condition with the assistance of the acceleration sensor, accurate in-time speed information can be acquired, success rate of auxiliary parking is increased, and probabilities of accidents are reduced.
Description
technical field [0001] The invention belongs to the field of auxiliary parking systems for automobiles, and in particular relates to a method and a device for assisting detection of vehicle speed under parking working conditions through an acceleration sensor. Background technique [0002] The car auxiliary parking system can help the driver successfully park in a narrow space. A distance sensor is installed on the outside of the car, and the size of the parking space is obtained through the external distance sensor combined with the speed of the car. Comprehensive vehicle speed and steering wheel angle information to calculate real-time vehicle position and attitude. The current assisted parking system for automobiles obtains the real-time vehicle speed directly from the vehicle itself (instrument or ABS). Larger, especially for the processing error of the electromagnetic induction sine wave output type wheel speed sensor, which eventually leads to the calculation error of...
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IPC IPC(8): G01P7/00
Inventor 马世典江浩斌吴狄唐斌华一丁
Owner JIANGSU UNIV