CN103018743A

CN103018743A - Static barrier judgment method for ultrasonic blind zone detection

Info

Publication number: CN103018743A
Application number: CN2012105184924A
Authority: CN
Inventors: 严日骞; 黄坤元; 张小贤; 王瑞宝; 陈锋
Original assignee: Tung Thih Electron Xiamen Co Ltd
Current assignee: Tung Thih Electron Xiamen Co Ltd
Priority date: 2012-12-06
Filing date: 2012-12-06
Publication date: 2013-04-03
Anticipated expiration: 2032-12-06
Also published as: CN103018743B

Abstract

The invention discloses a static barrier judgment method for ultrasonic blind zone detection. The method includes that 1 a front probe and a back probe are respectively arranged at the front end and the back end of an automobile lateral body, the detection angle of the front probe is smaller than the detection angle of the back probe, and the detection area of the front probe is not overlapped with the detection area of the back probe; and 2 the front probe and the back probe are respectively used for detecting the corresponding detection area in real time. A. If a barrier detected by the front probe is detected by the back probe in preset time, and the back probe detects that the barrier is in the away state, the barrier is judged to be a non continuous static barrier. B. If the front probe still detects the barrier when the back probe detects the barrier, the distance between the front probe and the barrier is larger than set distance, and the distance between the back probe and the barrier is larger than the distance between the front probe and the barrier, the barrier is judged to be a continuous static barrier. The method can comprehensively and effectively judge the static barrier and achieves the aim of avoiding error judgment and leakage judgment.

Description

The stationary obstruction decision method that a kind of ultrasound wave blind area is detected

Technical field

The present invention relates to ultrasound wave blind area detection field, relate in particular the stationary obstruction decision method that a kind of ultrasound wave blind area is detected.

Background technology

The blind area of vehicle mirrors very easily causes vehicle lane change side to hit the generation of accident, and simultaneously various objective environment factors also can cause rear view mirror blind zone to increase or disabler, for example (,) misty rain sky, night the rugged surroundings states such as the light is dusky.

Thus, progressively begin at present to apply take the blind area detection system of ultrasonic technology as the basis, it mainly is in order to point out the driver in the process of changing, the moving obstacle that exists in the rear view mirror blind zone; For stationary obstruction, such as trees, railing, metope, flowers and plants and parked vehicles etc. then needs to be judged out, and reporting system and need not to send alarm.

In view of this, be badly in need of a kind of accurately stationary obstruction decision method all sidedly, thereby avoid erroneous judgement or fail to judge, the inventor has this case to produce for above-mentioned further investigation then.

Summary of the invention

The stationary obstruction decision method that the object of the present invention is to provide a kind of ultrasound wave blind area to detect, it can accurately determine stationary obstruction all sidedly.

In order to reach above-mentioned purpose, solution of the present invention is:

The stationary obstruction decision method that a kind of ultrasound wave blind area is detected wherein, comprising:

1. pop one's head in and rear probe before the front-end and back-end that vehicle is leaned to one side are respectively arranged with, search angle of probe is less than the search angle of probe after this before this, and the search coverage of this front probe and the search coverage of rear probe are not overlapping;

2. front probe and rear probe detect search coverage separately respectively in real time:

A, discontinuous stationary object detect: if the barrier that front probe detects is detected by rear probe in the given time, and rear probe detects this barrier and is in away from state, judges that then this barrier is discontinuous stationary obstruction;

B, continuously stationary object detection: if when rear probe detects barrier, should still detect barrier by front probe, and distance is greater than setpoint distance between current probe and the barrier, and afterwards the probe and barrier between distance greater than between front probe and the barrier apart from the time, be judged to be continuous stationary obstruction.

Further, step 1. in, two of this left and right vehicle wheel leans to one side all to be provided with front probe and rear probe, respectively the blind area of left and right vehicle wheel both sides is detected.

Further, detection direction of probe is leaned to one side perpendicular to vehicle before this, and detection direction of probe favours that vehicle is leaned to one side and towards rear view of vehicle after this.

Further, step 2. in, probe sends detectable signal at separately a plurality of time points to barrier after this, and obtains respectively the distance of barrier and rear probe, be distal to the distance value that obtains than front transmission detectable signal if send afterwards the distance value that detectable signal obtains, then be judged to be barrier away from.

After adopting said structure, the stationary obstruction decision method that a kind of ultrasound wave blind area that the present invention relates to is detected, probe and rear probe before it arranges respectively by the front and back of leaning to one side at vehicle, and make the search coverage of the search coverage of this front probe and rear probe not overlapping, so in a single day, the barrier that is detected by front probe, detected by rear probe again in the given time, and determine barrier by rear probe and be in away from state, so just can judge that this barrier is stationary obstruction.

Description of drawings

Fig. 1 is the synoptic diagram of forward and backward probe set-up mode and search coverage in the stationary obstruction decision method that the present invention relates to detect a kind of ultrasound wave blind area;

Fig. 2 is the synoptic diagram of stationary obstruction decision method when rear probe judges that barrier is in away from state that the present invention relates to the detection of a kind of ultrasound wave blind area.

Among the figure:

Vehicle 100 front probes 1

Rear probe 2 barriers 3.

Embodiment

In order further to explain technical scheme of the present invention, the present invention will be described in detail below by specific embodiment.

The present invention relates to the stationary obstruction decision method that a kind of ultrasound wave blind area is detected, comprising:

1. probe 1 and rear probe 2 before the front-end and back-end that vehicle 100 is leaned to one side are respectively arranged with, search angle α of probe 1 is less than the search angle β of probe 2 after this before this, and this is front, and the pop one's head in search coverage B of 1 search coverage A and rear probe 2 is not overlapping; Specifically see also shown in Figure 1; In order to detect respectively the blind area of left and right vehicle wheel both sides, two of this vehicle about 100 leans to one side to be provided with front probe 1 and rear probe 2; Preferably, when actual detection, the detection direction of probe 1 is leaned to one side perpendicular to vehicle before this, and detection direction of probe 2 favours that vehicle is leaned to one side and towards rear view of vehicle after this.

2. front probe 1 and rear probe 2 detect search coverage separately respectively in real time, if the barrier that front probe 1 detects is detected by rear probe 2 in the given time, and after pop one's head in and 2 detect this barrier and be in away from state, judge that then this barrier is stationary obstruction.

Need to prove, for discontinuous stationary object (such as electric pole and trees), because it is not overlapping to be somebody's turn to do the search coverage of front probe 1 and rear probe 2, be that both generally can not detect barrier simultaneously, after probe 1 detects barrier namely, cross a schedule time T(such as 2s), rear detecting head will detect barrier, if again analyze as away from state, then can determine that it is stationary obstruction.

In case running into continuous metope (such as bridge, tunnel etc.) detects with discontinuous stationary object (such as interval greenbelt, stationary vehicle), so this step 2. in, if after pop one's head in 2 when detecting barrier, should still detect barrier by front probe 1, and distance is greater than setpoint distance (such as 3m) between current probe 1 and the barrier, and pop one's head in afterwards 2 and barrier between distance L during greater than the distance H between front probe 1 and the barrier, be judged to be the continuous metope of stationary obstruction.

Step 2. in, judge that as probe after this 2 barrier is away from a kind of embodiment of state, this rear probe 2 sends detectable signal at a plurality of time points separately to barrier 3, and obtain respectively the distance of barrier 3 and rear probe 2, be distal to the distance value that obtains than front transmission detectable signal if send afterwards the distance value that detectable signal obtains, then be judged to be barrier 3 away from.Particularly, as shown in Figure 2, this vehicle moves forward with speed V, be in the vehicle side rear barrier is arranged, should be respectively D0, D1, D2 and D3 in the distance that T0, T1, T2 and T3 detect barrier constantly by rear probe 2, if D0＜D1＜D2＜D3, so barrier from the distance between the rear probe 2 more and more away from.

Above-described embodiment and graphic and non-limiting product form of the present invention and style, any person of an ordinary skill in the technical field all should be considered as not breaking away from patent category of the present invention to its suitable variation or modification of doing.

Claims

1. the stationary obstruction decision method that the ultrasound wave blind area is detected is characterized in that, comprising:

2. the stationary obstruction decision method that detects of a kind of ultrasound wave as claimed in claim 1 blind area is characterized in that, step 1. in, two of this left and right vehicle wheel leans to one side all to be provided with front probe and rear probe, respectively the blind area of left and right vehicle wheel both sides is detected.

3. the stationary obstruction decision method that detects of a kind of ultrasound wave as claimed in claim 1 blind area, it is characterized in that, in step continuous stationary object 2. detected, detection direction of probe was leaned to one side perpendicular to vehicle before this, and detection direction of probe favours that vehicle is leaned to one side and towards rear view of vehicle after this.

4. the stationary obstruction decision method that detects of a kind of ultrasound wave as claimed in claim 1 blind area, it is characterized in that, step 2. in, this rear probe sends detectable signal at a plurality of time points separately to barrier, and obtain respectively the distance of barrier and rear probe, be distal to the distance value that obtains than front transmission detectable signal if send afterwards the distance value that detectable signal obtains, then be judged to be barrier away from.