CN201893870U

CN201893870U - Trajectory processing device in intelligent trajectory reversing system

Info

Publication number: CN201893870U
Application number: CN 201020179901
Authority: CN
Inventors: 冯曙
Original assignee: SHENZHEN DOWCAUSE TECHNOLOGY CO LTD
Current assignee: SHENZHEN DOWCAUSE TECHNOLOGY CO LTD
Priority date: 2010-05-05
Filing date: 2010-05-05
Publication date: 2011-07-06
Anticipated expiration: 2020-05-05

Abstract

The utility model discloses a trajectory processing device in an intelligent trajectory reversing system. The processing device comprises a decoder, a digital signal processor (DSP) module, a complex programmable logic device (CPLD) module and an encoder, wherein the decoder collects video information to output to the CPLD module, the decoder outputs trajectory video data calculation commands to the DSP module, the DSP module calculates and outputs the trajectory information to the CPLD module in real time, the trajectory information is added to the rear video data and is transmitted to the encoder by the CPLD module, and the information is output to a vehicle-mounted display unit through the encoder. The trajectory processing device in the intelligent trajectory reversing system stores dimensional data of different auto models and camera parameters into a storage, the data of corresponding auto model are selected from the system data base in the using process, therefore the trajectory processing device can calculate and output the trajectory data in real time, for newly added auto models and the angle and the installation site of different cameras, the system can calculate the motion trail of the auto accurately, the data base in the Flash needs to be renewed, therefore, the trajectory processing device has good universality.

Description

Trajectory processing unit in the intelligence track backing system

Technical field

The utility model discloses a kind of auxiliary electronic device of vehicle backing, particularly a kind of can be in reversing process in real time the trajectory that will pass through of accurate Calculation body of a motor car based on the trajectory processing unit in the intelligent track backing system of digital signal processor (DSP) and programmable logic device (CPLD).

Background technology

Automobile is a modal walking-replacing tool in people's daily life, and along with the development of automobile industry, automobile function is more and more complete, and a kind of intelligent track backing system has appearred in the operation the when driver is to reversing automobile for convenience in the prior art.Intelligence track backing system can accurately be predicted the zone that body of a motor car will pass through according to vehicle steering angle, body of a motor car size, system in reversing process in conjunction with the reversing automobile functional image, two reversings of mark leading line on vehicle-carrying DVD screen or other separate display screens, guiding driver reversing.The drawn fixed interior barrier of the safe and effective district of reversing scope of leading line just can be moveed backward safely accurately as long as the driver avoids moveing backward.

At present, the technology that product adopted is by single-chip microcomputer and OSD (On Screen Display on the market, be screen stack) module realizes, this series products calculate on computers in advance steering wheel under different angles the vehicle body trajectory and it is stored in the memory of OSD module.In reversing process, single-chip microcomputer obtains the steering wheel angle data from automobile can bus, and the OSD module is looked into from memory according to the angle value that obtains and got corresponding trajectory data, is presented at then on the vehicle-mounted display device.This scheme can not be calculated track data in real time, needs to calculate on computers separately in advance, and the process complexity, and it is for different model automobile, camera and camera installation site, and track data can not change thereupon, does not have versatility and and accuracy.

Summary of the invention

Do not have the shortcoming that computational process simply, does not have versatility at the above-mentioned of the prior art intelligent track backing system of mentioning, the utility model provides a kind of trajectory processing unit, it is combined closely by digital signal processor and programmable logic device, can calculate and show the reversing reference locus in real time, realize precisely reversing.

The technical scheme that its technical problem that solves the utility model adopts is: the trajectory processing unit in a kind of intelligent track backing system, processing unit comprises the decoder that is connected with vehicle-mounted rearview camera, the DSP module, CPLD module and the encoder that is connected with display unit, decoder is gathered video information and is exported to the CPLD module, decoder output trajectory video data calculation command is given the DSP module, the DSP module is calculated in real time and output trajectory information is given the CPLD module, the CPLD module outputs to vehicle-mounted display unit be added to automobile tail video data and be transferred to encoder of trace information through encoder.

The technical scheme that its technical problem that solves the utility model adopts further comprises:

Described DSP module is provided with the CAN bus interface that links to each other with automobile OBD interface.

Described decoder is connected with the external interrupt interface of DSP module.

Described DSP module is connected by the SPI interface with the CPLD module.

Having 3 general-purpose interfaces to be modeled to the SPI interface on the described CPLD module is connected with the DSP module.

The beneficial effects of the utility model are: the utility model is deposited in different automobile types sized data and camera parameter in the inner Flash memory of DSP, only need from system database, to select the data of corresponding vehicle in actual use, the track processing unit just can calculate and the output trajectory data in real time, for newly-increased vehicle and different camera angle and installation sites, system can both accurate Calculation body of a motor car movement locus, only need the database among the inner Flash of the simple DSP of renewal to get final product, have good versatility.

Below in conjunction with the drawings and specific embodiments the utility model is described further.

Description of drawings

Fig. 1 is the utility model system block diagram.

Fig. 2 is the utility model video decode partial circuit schematic diagram.

Fig. 3 is the utility model video coding partial circuit schematic diagram.

Fig. 4 is the utility model CPLD partial circuit schematic diagram.

Fig. 5 is the utility model DSP partial circuit schematic diagram.

Embodiment

Present embodiment is the utility model preferred implementation, and other all its principles are identical with present embodiment or approximate with basic structure, all within the utility model protection range.

Please referring to accompanying drawing 1 to accompanying drawing 5, mainly comprise decoder, DSP module, CPLD module and encoder in the utility model, decoder is connected with vehicle-mounted rearview camera, from vehicle-mounted rearview camera, obtain the automobile tail video data in real time, afterwards the automobile tail video data is sent into the CPLD module, and to DSP module transmission track video data calculation command, please referring to accompanying drawing 2, in the present embodiment, it is the video decoding chip of saa7113 that decoder adopts model, during concrete enforcement, also can adopt other model chips of said function to replace.The DSP module is connected with the CPLD module by the SPI interface, simultaneously, the DSP module is also by CAN bus and automobile OBD (on-board diagnostics, being onboard diagnostic system) interface links to each other, obtain the steering wheel angle data, the DSP module is accepted the track video data calculation command of decoder, and real-time track video data is sent to the CPLD module by the SPI interface.In the present embodiment, the DSP module adopts the form of external interrupt to obtain the track video data calculation command that decoder sends.Please referring to accompanying drawing 5, DSP module employing model is the dsp chip of TMS320F28016PZA in the present embodiment, when specifically implementing, also can adopt the dsp chip of other models.In the present embodiment, dsp chip inside contains the FLASH module that is useful on storage cart molded dimension data and camera parameter database and real-time track calculating kernel program.The video data that the CPLD module will be obtained from decoder and carry out video superimpose from the corresponding trajectory that the DSP module is obtained, video data after will superposeing then sends to encoder, and encoder obtains the video data after the stack and is sent to vehicle-carrying display screen in order to show from the CPLD module.In the present embodiment, the CPLD module is utilized three IO ports simulation SPI ports to be connected with the DSP module to carry out the track video Data Transmission.In the present embodiment, please referring to accompanying drawing 4, it is the CPLD module of EPM570T100C5N that the CPLD module adopts model, please referring to accompanying drawing 3, encoder employing model is the video coding chip of saa7121H in the present embodiment, when specifically implementing, also can adopt the chip of other models of said function to replace.

The utility model is deposited in different automobile types sized data and camera parameter in the inner Flash memory of DSP, only need from system database, to select the data of corresponding vehicle in actual use, the track processing unit just can calculate and the output trajectory data in real time, for newly-increased vehicle and different camera angle and installation sites, system can both the accurate Calculation body of a motor car reversing travel track, only need the database among the simple Flash of renewal to get final product, have good versatility.

Claims

1. the trajectory processing unit in the intelligent track backing system, it is characterized in that: described processing unit comprises decoder, DSP module, CPLD module and the encoder that is connected with display unit that is connected with vehicle-mounted rearview camera, decoder is gathered video information and is exported to the CPLD module, decoder output trajectory video data calculation command is given the DSP module, the DSP module is calculated in real time and output trajectory information is given the CPLD module, the CPLD module outputs to vehicle-mounted display unit be added to automobile tail video data and be transferred to encoder of trace information through encoder.

2. the trajectory processing unit in the intelligent track backing system according to claim 1 is characterized in that: described DSP module is provided with the CAN bus interface that links to each other with automobile OBD interface.

3. the trajectory processing unit in the intelligent track backing system according to claim 1 is characterized in that: described DSP inside modules FLASH element memory is put the database and the real-time track that contain automotive type size, camera parameter and is calculated kernel program.

4. the trajectory processing unit in the intelligent track backing system according to claim 1 is characterized in that: described decoder is connected with the external interrupt interface of DSP module.

5. the trajectory processing unit in the intelligent track backing system according to claim 1 is characterized in that: described DSP module is connected by the SPI interface with the CPLD module.

6. the trajectory processing unit in the intelligent track backing system according to claim 5 is characterized in that: have 3 general-purpose interfaces to be modeled to the SPI interface on the described CPLD module and be connected with the DSP module.