Control method and control system for low-speed active safety execution of automobile

An active safety and execution system technology, applied in the field of automotive electrical appliances, can solve problems such as the risk of collision with obstacles, and achieve the effects of reducing safety accidents, improving controllability, and improving reliability

Active Publication Date: 2019-10-01
CHONGQING CHANGAN AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention proposes a low-speed active safety execution system control method for automobiles, which mainly solves the active safety problem of vehicles in low-speed driving, and aims at increasing the stability and safety reliability of active safety functions in low-speed states of vehicles, by designing a low-speed active safety execution system Control strategy, collect data information collected by short-range ultrasonic radar and surround-view camera, detect surrounding environment information, solve the problem of collision risk with obstacles within 4 meters around the vehicle, fuse the data of the two sensors, and consider the impact of slope changes on distance Influenced by the value, build pressure compensation for the initial pressure value of the braking force, analyze the driver's action intention, and realize the coordinated control of the driver's real-time operation behavior and the function of the low-speed emergency braking execution system control strategy

Method used

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  • Control method and control system for low-speed active safety execution of automobile
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  • Control method and control system for low-speed active safety execution of automobile

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Embodiment 1

[0033] Implement the present invention, be provided with 12 ultrasonic sensors (ultrasonic radar) on the car, the distance of detection is 30cm to 450cm, plans 20 areas around the vehicle body, is distributed around the vehicle body. Detect the environmental information around the vehicle through the 12 ultrasonic sensors on the vehicle.

[0034] like figure 1 As shown, the obstacle chart detected by the ultrasonic sensor, the black car is the main car, and the gray car is the target car to be detected. During the passing of the car, as the vehicle moves forward, the ultrasonic sensor continuously detects the surrounding environment. When an obstacle is detected After the object, the ultrasonic wave passes through the received echo time, using the formula S 距 =(T 飞行 ×V 声 ) / 2 to calculate the distance from the obstacle, T 飞行 is the time from sending out the ultrasound to receiving the whole process, V 声is the propagation speed of sound wave in air, S 距 is the direct dista...

Embodiment 2

[0036] Implement the present invention, be provided with 4 high-definition cameras of 1,000,000 pixels on the car, the front and rear cameras are respectively positioned at the front and rear bumpers of the vehicle, and the left and right cameras are positioned at the rear view below when reversing.

[0037] like figure 2 As shown in the diagram of obstacles detected by the surround-view camera, the black car is the main vehicle, and the gray car is the detected target car. When the vehicle is driving, the surround-view camera continuously captures the information data of the surrounding environment. Process the obtained image information at a speed of 15 frames per second, and use the optical flow method to extract moving objects from the image. Use SFM technology to perform feature extraction and beam adjustment on objects in continuous images to form a sparse 3D point cloud. When the processed images reach a certain number, a dense 3D point cloud is formed. The black line ...

Embodiment 3

[0039] Realize the low-speed emergency braking execution system control strategy system architecture of the method of the present invention as image 3 Shown: 12 ultrasonic input modules are connected to the low-speed emergency braking system controller through the Lin bus, the surround view camera is connected to the low-speed emergency braking system controller through the coaxial digital signal line, and the low-speed emergency braking system controller is connected to the body controller through the CAN bus The BCMs are connected. The chip selected by the low-speed emergency braking system controller can be TI:TDA2X series, mainly TDA2S, TDA2P, TDA2E and so on.

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Abstract

The invention provides a control method and system for low-speed active safety execution of an automobile. A low-speed active safety execution system control strategy is designed, data information collected by a short-distance ultrasonic radar and a panoramic camera is collected, surrounding information is detected, and the problem that the automobile has the risk of colliding with obstacles within the range of 4 m around is solved; data of two sensors are fused, the influence of gradient changes on the distance value is considered, pressure buildup compensation is carried out on the initial pressure value of brake force, the action intention of a driver is analyzed, and coordination control is carried out over real-time operation behaviors of the driver and the functions of the low-speedemergency brake execution system control strategy; and the problem about driving active safety of the automobile in the low-speed state is solved, and for the active safety function of the vehicle inthe low-speed state, stability is increased, and safety reliability is improved.

Description

technical field [0001] The invention belongs to the field of automobile electric appliances, and in particular relates to an active safety control strategy system in a low-speed state of a vehicle. Background technique [0002] In recent years, my country's automobile market has increasingly high demand for active safety functions in low-speed driving conditions. There are more and more vehicles in cities, and there are many low-speed scenes of vehicles in life, such as: in congested roads, parking processes and low-speed passing Fork roads, etc., the driving safety requirements of vehicles at low speeds are also increasing. Therefore, it is necessary to propose an effective, reliable and more intelligent control strategy. Aiming at the low-speed driving state, we propose a low-speed emergency braking execution system control strategy. [0003] At present, the industry has proposed many schemes that can provide active safety collision avoidance systems during driving. These...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60W30/09B60W40/00B60W40/105B60W40/076
CPCB60W30/09B60W40/00B60W40/076B60W40/105
Inventor 苏斌梁锋华张伟方万凯林高享久
Owner CHONGQING CHANGAN AUTOMOBILE CO LTD
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