CN105083171A - Automotive running data recording system and method - Google Patents

Abstract

The present invention relates to a system and method for recording vehicle driving data. The system includes: a digital video recorder, used to record the driving data of the vehicle according to the driving conditions of the vehicle in a power-on state; a first switch element connected to the Between the power supply and the digital video recorder, it is used to control the digital video recorder to be powered on or off; the second switch element is used to control the first switch element to be turned on or off; the first line is used to Conducting and controlling the conduction of the second switch element when the car is started; the second circuit is used to control the conduction of the second switch element when the car is turned off; and the micro control unit is connected with the digital video recorder and the The second line connection is used to control the conduction of the second line when the car is turned off, and to judge whether the data processing of the digital video recorder is completed after the car is turned off, and to control the second line to continue according to the judgment result. on or off.

Description

Vehicle driving data recording system and method

technical field

The invention relates to the field of automobile driving monitoring, in particular to a system and method for recording automobile driving data.

Background technique

With the development of society, cars have become a short-distance means of transportation for more and more people. The increase in automobiles has led to more and more people paying attention to the safety of automobiles. Therefore, the emergence of digital video recorders (Digital Video Recorders, referred to as DVRs), which record the images and sounds of vehicles on the way. instrument. After the digital video recorder is installed, the video image and sound of the whole process of driving the car can be recorded, which can provide evidence for traffic accidents, and can also record the scenery in the user's driving route. However, the digital video recorder records data with the start of the car, and interrupts the recording when the car is turned off, so there is a problem that the data recorded by the digital video recorder has not been recorded when the car is turned off, resulting in incomplete recorded data. , and may damage the relevant hardware of the digital video recorder to store data. Therefore, still keep recording data after the car is turned off, and interrupting the work of the digital video recorder after the data recording is completed has become a problem to be solved urgently.

Contents of the invention

In view of this, the embodiments of the present invention provide a system and method for recording vehicle driving data, which can effectively prevent the problem of interruption of data recording when the vehicle is turned off, and improve the service life of each component of the vehicle driving data recording system.

An embodiment of the present invention provides a vehicle driving data recording system, the vehicle driving data recording system comprising:

A digital video recorder is used to record the driving data of the car according to the driving condition of the car under the power-on state;

The first switch element is connected between the power supply and the digital video recorder, and is used to control the digital video recorder to be powered on or off;

a second switch element, configured to control the first switch element to be turned on or off;

The first circuit is used to conduct and control the conduction of the second switching element when the vehicle is started;

The second circuit is used to control the conduction of the second switching element when the vehicle is turned off; and

A micro control unit, connected with the digital video recorder and the second line, used to control the conduction of the second line when the car is turned off, and used to judge whether the data processing of the digital video recorder is complete, and control the second line to continue to be turned on or off according to the judgment result.

As a further improvement of the embodiment of the present invention, the first switching element and the second switching element are transistors.

As a further improvement of the embodiment of the present invention, the first switch element is turned on at a low level, one channel end of the second switch element is connected to the control end of the first switch, and the second switch element The other via end is grounded.

As a further improvement of the embodiment of the present invention, the first circuit includes a first diode, the anode of the first diode is connected to the ACC gear, and the cathode of the first diode is connected to the second switching element the control terminal.

As a further improvement of the embodiment of the present invention, the first circuit further includes a Zener diode, and the Zener diode is connected between the ACC gear and the anode of the first diode.

As a further improvement of the embodiment of the present invention, the second circuit includes a second diode, the anode of the second diode is connected to the micro control unit, and the cathode of the second diode is connected to the first The control terminal of the second switching element.

As a further improvement of the embodiment of the present invention, the micro control unit is further configured to judge that the data processing has been completed according to an interrupt signal sent from the digital video recorder to the micro control unit.

Embodiments of the present invention also provide a method for recording vehicle driving data, the method comprising the following steps:

When the car is started, the first circuit is turned on, and then the first switch element connected to the power supply and the digital video recorder is turned on, so that the digital video recorder is in an electrified state;

The digital video recorder records the driving data of the car according to the driving condition of the car;

When the vehicle is turned off, the first circuit is disconnected, and the micro-control unit conducts the second circuit, thereby keeping the first switching element in conduction;

The micro-control unit judges whether the data processing of the digital video recorder is completed, if it judges that the data processing is not completed, then makes the second circuit continue to conduct; if it judges that the data processing has been completed, then makes the second line Line disconnected.

As a further improvement of the embodiment of the present invention, the micro-control unit judging whether the data processing of the digital video recorder is completed includes: the micro-control unit judges according to the interrupt signal sent by the digital video recorder to the micro-control unit The data processing is complete.

According to the system and method of the above embodiments of the present invention, by adding a second line to control the switch element connected to the digital video recorder, the digital video recorder can still be kept powered on after the car is turned off, which can effectively prevent data recording from happening. The power supply is interrupted to improve the life of each component of the vehicle driving data recording system.

In order to make the above and other objects, features and advantages of the present invention more comprehensible, preferred embodiments will be described in detail below together with the accompanying drawings.

Description of drawings

Fig. 1 is a structural block diagram of a vehicle driving data recording system provided by the first embodiment of the present invention.

Fig. 2 is a flow chart of a method for recording vehicle driving data provided by the second embodiment of the present invention.

Detailed ways

In order to further explain the technical means and effects of the present invention to achieve the intended purpose of the invention, the specific implementation, structure, features and effects of the present invention will be described in detail below in conjunction with the accompanying drawings and preferred embodiments.

first embodiment

Please refer to FIG. 1 . FIG. 1 is a schematic structural diagram of a vehicle driving data recording system provided by the first embodiment of the present invention. As shown in Figure 1, this automobile driving data recording system includes: one or more digital video recorders 100 (only one is shown in the figure), a first switching element 200, a second switching element 300, a first circuit 400, a second Wiring 500 , microcontroller unit 600 and power supply 700 .

The digital video recorder 100 employs hard disk recording, also known as a DVR. Digital video recorder 100 is a set of computer systems for image storage and processing. It has the functions of long-term video recording, recording, remote monitoring and control of images/voices. DVR integrates video recorders, screen splitters, PTZ lens control, and alarm control. , network transmission and other five functions. In detail, when the digital video recorder 100 works, it also cooperates with other components. For example, a camera collects data, and the digital video recorder 100 processes the data collected by the camera.

Further, the digital video recorder 100 may be a 360° panoramic monitoring system (Around View Monitor, AVM for short). The 360° panoramic monitoring system includes at least a video recorder, a camera, a display, and a host computer. Of course, the 360° panoramic monitoring system may include more or less components than those described above, or components different from those described above. In this embodiment, the digital video recorder 100 is used to record the driving data of the car according to the driving conditions of the car in the power-on state. Further, the digital video recorder 100 collects photos or videos of the environment around the vehicle for the camera according to the driving data processed and recorded by the driving conditions of the vehicle.

The power source 700 is a car battery. When the car is started, the power supply 700 supplies power to various components of the car.

The first switch element 200 is connected between the power supply 700 and the digital video recorder 100 for controlling the digital video recorder 100 to be powered on or off. When the first switch element 200 is turned on, the power supply 700 supplies power to the digital video recorder 100 , and the digital video recorder 100 is in a powered state. When the first switch element 200 is turned off, the power supply 700 stops supplying power to the digital video recorder 100, and the digital video recorder 100 is in a power-off state. In this embodiment, the first switch element 200 includes a control terminal, a first channel terminal and a second channel terminal, the control terminal is connected to the second switch element 300, the first channel terminal is connected to the digital video recorder 100, and the second channel terminal is connected to the power supply 700. Preferably, the first switch element 200 is a triode, the base of the triode is the control terminal, the collector is the first access terminal, and the emitter is the second access terminal. In other embodiments, the first switch element 200 is a transistor.

The second switch element 300 is used to control the first switch element 200 to be turned on or off. In this embodiment, the second switch element 300 includes a control terminal, a first channel terminal and a second channel terminal, the control terminal is connected to the first circuit 400 and the second circuit 500, the first channel terminal is connected to the first switch component 200, and the second channel terminal is connected to the first circuit 400 and the second circuit 500. The second channel end is grounded. Preferably, the second switch element 300 is a triode, the base of the triode is the control terminal, the collector is the first access terminal, and the emitter is the second access terminal. In other embodiments, the second switch element 300 is a transistor.

Microcontroller Unit (MCU) 600, also known as Single Chip Microcomputer (SingleChipMicrocomputer) or single-chip microcomputer, is to properly reduce the frequency and specifications of the Central Processing Unit (CentralProcessUnit; CPU), and the memory (memory), counter (Timer) ), USB, A/D conversion, UART, PLC, DMA and other peripheral interfaces, and even the LCD drive circuit are integrated on a single chip to form a chip-level computer for different combination controls for different applications. In this embodiment, the micro control unit 600 is connected to the digital video recorder 100 and the second circuit 500 .

The first circuit 400 is used to conduct and control the second switch element 300 to conduct when the vehicle is started. In this embodiment, the first circuit 400 includes a regulator diode 401 and a first diode 402, the cathode of the regulator diode 401 is connected to the ACC gear, and the anode of the regulator diode 401 is connected to the first two The anode of the tube 402 and the cathode of the first diode 402 are connected to the control terminal of the second switching element 300 . In addition, the first circuit 400 also includes a first resistor 403 and a second resistor 404, the first resistor 403 is connected between the ACC gear and the cathode of the Zener diode 401, preferably, the first resistor 403 is The voltage dividing resistor preferably has a resistance value of 1KΩ. The second resistor 404 is connected between the anode of the first diode 402 and the ground, and the resistance value is preferably 47KΩ.

The second circuit 500 is used to control the second switching element to conduct 300 when the vehicle is turned off. In this embodiment, the second circuit 500 includes a second diode 501 , the anode of the second diode 501 is connected to the microcontroller unit 300 , and the cathode is connected to the control terminal of the second switching element 300 .

In detail, when the car is started, the accessories (such as accessories such as radios) can be connected to the power supply through the ACC gear. The ACC gear is controlled by the car key. Therefore, when the car is started, the first line 400 connected to the ACC gear is turned on, that is to say, the first diode 402 of the first line 400 is turned on, so that the second switching element 300 is turned on, and then the first switching element 300 is turned on. 200 is turned on, so that the power supply 700 supplies power to the digital video recorder 100, and the digital video recorder 100 records the driving data of the car according to the driving conditions.

In one example, the second switch element 300 is turned on at a high level, and the first switch element 200 is turned on at a low level. Therefore, after the first line 400 connected to the ACC gear is turned on, the second switch element 300 is turned on, the emitter of the second switch element 300 is grounded, and the collector of the second switch element 300 is connected to the first switch element 200, when After the second switch element 300 is turned on, the voltage of the control terminal of the first switch element 200 is pulled down. At this time, the first switch element 200 is turned on, and the power supply 700 supplies power to the digital video recorder 100 through the first switch element 200 .

When the car is turned off, the first line 400 connected to the ACC gear is disconnected, that is, the first diode 402 is disconnected. At this time, the micro control unit 600 provides a conduction signal (such as a high-level signal) to the second circuit 500, so that the second circuit 500 is conducted, and then the second switch element 300 is conducted, so that the first switch element 200 stay on.

Further, the micro control unit 600 also judges whether the data processing of the digital video recorder 100 is completed after the car is turned off, and controls the second circuit 500 to continue to be turned on or off according to the judgment result. In detail, the micro control unit 600 judges whether the data processing of the digital video recorder 100 is completed by whether it receives the interrupt signal sent by the digital video recorder 100 . For example, if the micro control unit 300 receives the interrupt signal sent by the digital video recorder 100 when the car is stopped, it means that the data processing of the digital video recorder 100 is completed, and then the second line 500 is interrupted.

Usually, when the car is turned off and the first line 400 is interrupted, the camera of the digital video recorder 100 generally also collects the temporary data of the moment when the car is turned off, and the digital video recorder 100 will also perform data processing. Therefore, after the car is turned off, the digital video The video recorder 100 also needs a certain amount of time for data processing. At this time, the digital video recorder 100 will not send an interrupt signal to the micro control unit 600 , and the micro control unit 600 keeps the second line 500 in a conducting state, so that the power supply 700 continues to supply power to the digital video recorder 100 .

Further, when the data processing of the digital video recorder 100 is completed, the digital video recorder 100 sends an interrupt signal to the micro control unit 600, and the micro control unit 600 sends an instruction to interrupt the second circuit 500 after receiving the interrupt signal, so that the second circuit The second diode 501 of 500 is off. Turning off the second diode 501 leads to turning off the second switching element 300 , and further, turning off the second switching element 300 further leads to turning off the first switching element 200 , so that the power supply 700 stops supplying power to the digital video recorder 100 .

According to the system of this embodiment, by adding a second line 500, so that the digital video recorder 100 can still be turned on through the second line 500 when the car is turned off and the first line 400 is disconnected, the power supply 700 can continue to serve as a digital video recorder. 100 power supply, so it can effectively prevent the digital video recorder 100 from interrupting data recording when the car is turned off, and effectively improve the life of the components of the digital video recorder.

second embodiment

This embodiment provides a method for recording vehicle driving data. The method of this embodiment can be used in the system shown in Figure 1. As shown in Figure 2, the method of this embodiment includes the following steps:

Step S101 , when the car is started, the first circuit is turned on, and then the first switching element connected to the power supply and the digital video recorder is turned on, so that the digital video recorder is in an electrified state.

Specifically, when the car is started, the first line 400 connected to the ACC gear is turned on, so that the second switch element 300 connected to the first line 400 is turned on, and then the first switch element 200 connected to the second switch element 300 is turned on. connected, so that the power supply 700 can supply power to the digital video recorder 100.

Step S102, the digital video recorder records the driving data of the car according to the driving condition of the car.

Specifically, when the power supply 700 supplies power to the digital video recorder 100, the digital video recorder 100 can record the driving data of the car according to the driving conditions of the car.

Step S103 , when the vehicle is turned off, the first circuit is disconnected, and the micro control unit conducts the second circuit, thereby keeping the first switching element in conduction.

Step S104, the micro control unit judges whether the data processing of the digital video recorder is completed.

In detail, if the micro control unit 600 judges that the data processing of the digital video recorder 100 is not completed, then execute step S105; if it judges that the data processing of the digital video recorder 100 is complete, then execute step S106.

In detail, the micro control unit 600 judging whether the data processing of the digital video recorder 100 is completed includes: the micro control unit 600 judges that the data processing is complete according to the interrupt signal sent by the digital video video recorder 100 to the micro control unit 600 . If the micro-control unit 600 receives the interrupt signal that the digital video recorder 100 sends then judges that the data processing of the video recorder 100 is completed, and interrupts the second line 500; if the micro-control unit does not receive the interrupt signal that the digital video recorder 100 sends then judges the video If the data processing of the video recorder 100 is not completed, the second line 500 is kept in a conducting state, and the digital video recorder 100 can continue to work.

Step S105, making the second line continue to be turned on.

Step S106, disconnecting the second line.

Other details about this embodiment may further refer to the first embodiment, which will not be repeated here.

According to the method of this embodiment, by adding a second line 500, so that the digital video recorder 100 can still be turned on through the second line 500 to make the power supply 700 continue to be a digital video recorder when the car is turned off and the first line 400 is disconnected. 100 power supply, so it can effectively prevent the digital video recorder 100 from interrupting data recording when the car is turned off, and effectively improve the life of the components of the digital video recorder.

The above are only preferred embodiments of the present invention, and do not limit the present invention in any form. Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art will not Within the scope of the technical solution of the present invention, when the technical content disclosed above can be used to make some changes or be modified into equivalent embodiments of equivalent changes, but as long as it does not depart from the technical solution of the present invention, the technical essence of the present invention will be used for the above-mentioned Any simple modifications, equivalent changes and modifications made in the embodiments still fall within the scope of the technical solution of the present invention.

Claims (9)

1. A vehicle driving data recording system, characterized in that, the vehicle driving data recording system comprises: A digital video recorder is used to record the driving data of the car according to the driving condition of the car under the power-on state; The first switch element is connected between the power supply and the digital video recorder, and is used to control the digital video recorder to be powered on or off; a second switch element, configured to control the first switch element to be turned on or off; The first circuit is used to conduct and control the conduction of the second switching element when the vehicle is started; The second circuit is used to control the conduction of the second switching element when the vehicle is turned off; and A micro control unit, connected with the digital video recorder and the second line, used to control the conduction of the second line when the car is turned off, and used to judge whether the data processing of the digital video recorder is complete, and control the second line to continue to be turned on or off according to the judgment result. 2. The vehicle driving data recording system according to claim 1, wherein the first switching element and the second switching element are transistors. 3. The automobile driving data recording system as claimed in claim 1, characterized in that, the first switch element is low-level conduction, and a channel end of the second switch element is connected with the control of the first switch. terminal, and the other channel terminal of the second switching element is grounded. 4. The automobile driving data recording system according to claim 1, wherein the first circuit comprises a first diode, the anode of the first diode is connected to the ACC gear, and the first diode The cathode of the tube is connected to the control terminal of the second switching element. 5. The vehicle driving data recording system according to claim 4, wherein the first circuit further comprises a Zener diode, and the Zener diode is connected between the ACC gear and the first diode. between the anodes. 6. The automobile driving data recording system as claimed in claim 4, wherein the second circuit comprises a second diode, the anode of the second diode is connected to the micro control unit, and the first The cathodes of the two diodes are connected to the control terminal of the second switching element. 7. The automobile driving data recording system according to claim 1, wherein the micro-control unit is also used for judging that the data processing has been completed according to the interrupt signal sent by the digital video recorder to the micro-control unit. Finish. 8. A method for recording vehicle driving data, characterized in that the method comprises the following steps: When the car is started, the first circuit is turned on, and then the first switch element connected to the power supply and the digital video recorder is turned on, so that the digital video recorder is in an electrified state; The digital video recorder records the driving data of the car according to the driving condition of the car; When the vehicle is turned off, the first circuit is disconnected, and the micro-control unit conducts the second circuit, thereby keeping the first switching element in conduction; The micro-control unit judges whether the data processing of the digital video recorder is completed, if it judges that the data processing is not completed, then makes the second circuit continue to conduct; if it judges that the data processing has been completed, then makes the second line Line disconnected. 9. The automobile driving data recording method according to claim 8, wherein the micro-control unit judging whether the data processing of the digital video recorder is completed comprises: the micro-control unit according to the digital video recorder to the The interrupt signal sent by the micro control unit is used to judge that the data processing has been completed.