Automobile data recorder circuit applying gravity sensor

Abstract

The utility model discloses an automobile data recorder circuit applying a gravity sensor. The automobile data recorder circuit comprises the gravity sensor, a main controller and a power supply device, wherein the gravity sensor is used for sensing acceleration force borne by a vehicle and converting the change condition of the acceleration force borne by the corresponding vehicle into a corresponding electric signal; the main controller is used for being connected with the gravity sensor and receiving, processing and analyzing an electric signal fed back by the gravity sensor; the power supply is used for being connected with the gravity sensor and the main controller and supplying power to the gravity sensor and the main controller. According to the circuit, the acceleration force borne by the vehicle and the displacement condition of the vehicle, which are detected by the gravity sensor, can be detected by the main controller, so that the main controller can conveniently make more accurate analysis and judgment on the driving condition of the vehicle according to the data of the gravity sensor.

Description

Technical Field

[0001] The design of the utility model relates to the technical field of sensors, and particularly relates to a gravity sensor. Background Art

[0002] A G-sensor, that is, a gravity sensor, can accurately capture the subtle changes in the acceleration force acting on an object due to displacement changes such as shaking, falling, rising, and landing. If it is installed on a movable object, by analyzing the changes in the acceleration force captured by the gravity sensor on the object, the displacement changes of the object can be reasonably inferred, so as to understand the movement process of the object. In the prior art, there is no technical solution that applies a gravity sensor to a driving recorder to record the driving conditions of a vehicle or other possible unexpected situations. Content of the Utility Model

[0003] Based on this, it is necessary to provide a driving recorder circuit that applies a gravity sensor, connects the gravity sensor with other devices, and only sends out the sensed data of the gravity sensor after processing to facilitate participating in the subsequent data processing work of the driving recorder.

[0004] The technical solution of the utility model is as follows:

[0005] A driving recorder circuit applying a gravity sensor includes:

[0006] A gravity sensor, which is used to sense the acceleration force received by the vehicle and convert the corresponding change in the acceleration force received by the vehicle into a corresponding electrical signal;

[0007] A main controller, which is used to connect with the gravity sensor, receive, process, and analyze the electrical signal fed back by the gravity sensor;

[0008] And a power supply, which is used to connect with the gravity sensor and the main controller respectively, and supply power to the gravity sensor and the main controller respectively.

[0009] Optionally, the gravity sensor includes a sensor chip, and the specific model of the sensor chip is DA380.

[0010] Optionally, the main controller includes a main control chip, and the specific model of the main control chip is NT96670.

[0011] Optionally, the sensor chip is connected to the main control chip through its SDA pin, SCL pin, and INT pin.

[0012] Optionally, the main controller further includes a first main control resistor, a second main control resistor, a third main control resistor, a fourth main control resistor, and a first main control capacitor; one end of the first main control resistor is connected to the power supply, and the other end of the first main control resistor is connected to the SDA pin of the sensor chip; one end of the second main control resistor is connected to the power supply, and the other end of the second main control resistor is connected to the SCL pin of the sensor core; one end of the third main control resistor is connected to the INT pin of the sensor chip, and the other end of the third main control resistor is connected to the main control chip; one end of the fourth main control resistor is connected to the common end of the third main control resistor and the sensor chip, and the other end of the fourth main control resistor is grounded; one end of the first main control capacitor is connected to the common end of the third main control resistor and the main control chip, and the other end of the first main control capacitor is grounded.

[0013] Optionally, the power supply includes a farad capacitor socket, a first power supply resistor, a second power supply resistor, a third power supply resistor, a fourth power supply resistor, a first power supply diode, a first power supply MOS transistor, a second power supply MOS transistor, and a first power supply triode; the farad capacitor socket corresponds to the two connection terminals of the external farad capacitor and has two socket pins. One of the socket pins of the farad capacitor socket is grounded, and the other socket pin is connected to one end of the first power supply resistor. The other end of the first power supply resistor is connected to the cathode of the first power supply diode, and the anode of the first power supply diode is led out as the charge and discharge terminal of the farad capacitor; the source of the first power supply MOS transistor is connected to the common end of the farad capacitor socket and the first power supply resistor, the drain of the first power supply MOS transistor is connected to the drain of the second power supply MOS transistor, and the source of the second power supply MOS transistor is connected to the anode of the first power supply diode; one end of the second power supply resistor is connected to the common end of the farad capacitor socket and the first power supply MOS transistor, the other end of the second power supply resistor is connected to the gate of the first power supply MOS transistor, and the gate of the second power supply MOS transistor is connected to the common end of the first power supply MOS transistor and the second power supply resistor; the collector of the first power supply triode is connected to the gate of the first power supply MOS transistor, the emitter of the first power supply triode is grounded, the base of the first power supply triode is connected to one end of the third power supply resistor, and the other end of the third power supply resistor is connected to the main control chip; one end of the fourth power supply resistor is connected to the common end of the first power supply triode and the third power supply resistor, and the other end of the fourth power supply resistor is grounded.

[0014] Optionally, the power supply further includes a DCDC chip, and the specific model of the DCDC chip is TMI3411; the charge and discharge terminal of the farad capacitor led out from the anode of the first power supply diode is connected to the DCDC chip.

[0015] Optionally, the power supply further includes a first power inductor, a first power capacitor, a fifth power resistor, and a sixth power resistor; one end of the first power inductor is connected to the DCDC chip, and the other end of the first power inductor is led out as an internal power supply terminal. The internal power supply terminal led out from the DCDC chip is respectively connected to the sensor chip and the main control chip; one end of the first power capacitor is connected to the end of the first power inductor away from the DCDC chip, and the other end of the first power capacitor is connected to the DCDC chip; one end of the fifth power resistor is connected to the common terminal of the first power capacitor and the first power inductor, and the other end of the fifth power resistor is connected to one end of the sixth power resistor; the other end of the sixth power resistor is grounded; the common terminal of the fifth power resistor and the sixth power resistor is connected to the DCDC chip.

[0016] Optionally, the power supply further includes an overvoltage and overcurrent protection chip and a second power diode; the anode of the second power diode is connected to the overvoltage and overcurrent protection chip, and the cathode of the second power diode is connected to the anode of the first power diode.

[0017] Optionally, the specific model of the overvoltage and overcurrent protection chip is WS3202E.

[0018] The beneficial effects of the technical solution of the present utility model are as follows: This circuit can include the main controller for the acceleration force and vehicle displacement detected by the gravity sensor, facilitating the main controller to make a more accurate analysis and judgment on the driving situation of the vehicle based on the data of the gravity sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0020] Figure 1 It is the circuit schematic diagram of the driving recorder circuit applying the gravity sensor provided in the specific implementation manner.

[0021] Figure 2 It is the timing diagram at the SDA and SCL pins of the sensor chip when the driving recorder circuit applying the gravity sensor provided in the specific implementation manner is working specifically.

[0022] The realization, functional characteristics, and advantages of the object of the present utility model will be further described in conjunction with the embodiments with reference to the drawings. Detailed implementation manners

[0023] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0024] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present utility model are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If this specific posture changes, then the directional indications will also change accordingly.

[0025] In addition, the descriptions involving "first", "second", etc. in the present utility model are only for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In addition, "and / or" throughout the text includes three scenarios. Taking A and / or B as an example, it includes the technical solution of A, the technical solution of B, and the technical solution that both A and B are satisfied at the same time. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present utility model.

[0026] Refer to Figure 1-2 。

[0027] In this specific implementation manner, a driving recorder circuit applying a gravity sensor is provided, including a gravity sensor, a main controller, and a power supply.

[0028] Among them, the gravity sensor is used to sense the acceleration force received by the vehicle and convert the corresponding change in the acceleration force received by the vehicle into a corresponding electrical signal; the main controller is used to connect with the gravity sensor, receive, process, and analyze the electrical signal fed back by the gravity sensor; the power supply is used to connect with the gravity sensor and the main controller respectively, and supply power to the gravity sensor and the main controller respectively. The power supply supplies power to the gravity sensor and the main controller respectively to ensure their stable operation. In this way, information such as the vehicle making an emergency direction avoidance during driving, being hit or scratched by another vehicle, or being hit or damaged by an external force in the parked state will be sensed by the gravity sensor and continuously reported to the main controller to assist the main controller in real-time analyzing the vehicle condition and road condition, facilitating all-round and multi-dimensional recording.

[0029] In this specific embodiment, the gravity sensor includes a sensor chip U21, and the specific model of the sensor chip U21 is DA380. The main controller includes a main control chip U38, and the specific model of the main control chip U38 is NT96670. The sensor chip U21 is connected to the main control chip U38 through its SDA pin, SCL pin, and INT pin.

[0030] When the driving recorder circuit provided in this specific embodiment is working specifically, the sensor chip U21 can sense the change in the acceleration force of the vehicle in the X, Y, and X axis directions. Using the SDA pin, SCL pin, and INT pin to connect the sensor chip U21 and the main control chip U38, the two will communicate using the I2C bus protocol. For specific reference Figure 2 When the sensor chip U21 and the main control chip U38 communicate using the I2C bus protocol, under the start condition, the level conditions of the SDA pin and the SCL pin are: SCL is high, and SDA has a falling edge; after sending 7 address bits, the direction control bit R / W selects read or write operations. When the slave device recognizes that it is being addressed, it will confirm (ACK) the cycle by pulling down SDA in the ninth SCL.

[0031] In this specific embodiment, the main controller further includes a first main control resistor R119, a second main control resistor R120, a third main control resistor R121, a fourth main control resistor R122, and a first main control capacitor C149; one end of the first main control resistor R119 is connected to the power supply, and the other end of the first main control resistor R119 is connected to the SDA pin of the sensor chip U21; one end of the second main control resistor R120 is connected to the power supply, and the other end of the second main control resistor R120 is connected to the SCL pin of the sensor chip U21; one end of the third main control resistor R121 is connected to the INT pin of the sensor chip U21, and the other end of the third main control resistor R121 is connected to the main control chip U38; one end of the fourth main control resistor R122 is connected to the common end of the third main control resistor R121 and the sensor chip U21, and the other end of the fourth main control resistor R122 is grounded; one end of the first main control capacitor C149 is connected to the common end of the third main control resistor R121 and the main control chip U38, and the other end of the first main control capacitor C149 is grounded.

[0032] In this specific embodiment, the power supply includes a farad capacitor socket CN16, a first power resistor R18, a second power resistor R21, a third power resistor R567, a fourth power resistor R742, a first power diode D26, a first power MOS transistor Q39, a second power MOS transistor Q40, and a first power triode Q41. The farad capacitor socket CN16 corresponds to the two connection terminals of an external farad capacitor and has two socket pins. One of the socket pins of the farad capacitor socket CN16 is grounded, and the other socket pin is connected to one end of the first power resistor R18. The other end of the first power resistor R18 is connected to the cathode of the first power diode D26, and the anode of the first power diode D26 is led out as the charge and discharge terminal of the farad capacitor. The source electrode of the first power MOS transistor Q39 is connected to the common terminal of the farad capacitor socket CN16 and the first power resistor R18. The drain electrode of the first power MOS transistor Q39 is connected to the drain electrode of the second power MOS transistor Q40, and the source electrode of the second power MOS transistor Q40 is connected to the anode of the first power diode D26. One end of the second power resistor R21 is connected to the common terminal of the farad capacitor socket CN16 and the first power MOS transistor Q39, and the other end of the second power resistor R21 is connected to the gate of the first power MOS transistor Q39. The gate of the second power MOS transistor Q40 is connected to the common terminal of the first power MOS transistor Q39 and the second power resistor R21. The collector of the first power triode Q41 is connected to the gate of the first power MOS transistor Q39, the emitter of the first power triode Q41 is grounded, and the base of the first power triode Q41 is connected to one end of the third power resistor R567. The other end of the third power resistor R567 is connected to the main control chip U38. One end of the fourth power resistor R742 is connected to the common terminal of the first power triode Q41 and the third power resistor R567, and the other end of the fourth power resistor R742 is grounded. The farad capacitor socket CN16 is adapted to an external farad capacitor. After the two connection terminals of the external farad capacitor are respectively connected to the two connection pins of the farad capacitor socket CN16, the power supply can affect the charge and discharge conditions of the external farad capacitor under the supervision and control of the main controller U38.

[0033] In this specific embodiment, the power supply further includes a DCDC chip U40, and the specific model of the DCDC chip U40 is TMI3411. The charge and discharge terminal of the farad capacitor led out from the anode of the first power diode D26 is connected to the DCDC chip U40. TMI3411 is a 1.0 MHz constant frequency, current mode buck converter. By setting TMI3411 as the DCDC chip U40 and cooperating it with the external farad capacitor, step-down conversion is completed inside the circuit to provide a power supply adapted to components with different voltage requirements.

[0034] In this specific embodiment, the power supply further includes a first power inductor L11, a first power capacitor C417, a fifth power resistor R745, and a sixth power resistor R744; one end of the first power inductor L11 is connected to the DCDC chip U40, and the other end of the first power inductor L11 is led out as an internal power supply terminal. The internal power supply terminal led out from the DCDC chip U40 is respectively connected to the sensor chip U21 and the main control chip U38; one end of the first power capacitor C417 is connected to the end of the first power inductor L11 away from the DCDC chip U40, and the other end of the first power capacitor C417 is connected to the DCDC chip U40; one end of the fifth power resistor R745 is connected to the common terminal of the first power capacitor C417 and the first power inductor L11, and the other end of the fifth power resistor R745 is connected to one end of the sixth power resistor R744; the other end of the sixth power resistor R744 is grounded; the common terminal of the fifth power resistor R745 and the sixth power resistor R744 is connected to the DCDC chip U40.

[0035] In this specific embodiment, the power supply further includes an overvoltage and overcurrent protection chip U39 and a second power diode D27; the anode of the second power diode D27 is connected to the overvoltage and overcurrent protection chip U39, and the cathode of the second power diode D27 is connected to the anode of the first power diode D26.

[0036] In this specific embodiment, the specific model of the overvoltage and overcurrent protection chip U39 is WS3202E.

[0037] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention. Any equivalent structural transformation made under the inventive concept of the present invention by using the content of the specification and drawings of the present invention, or directly / indirectly applied to other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A driving recorder circuit using a gravity sensor, characterized in that: include: A gravity sensor is used to sense the acceleration force on the vehicle and convert the change of the acceleration force on the vehicle into a corresponding electrical signal; A main controller, used to connect to the gravity sensor, receive, process and analyze the electrical signal fed back by the gravity sensor; and a power supply, which is used to be connected to the gravity sensor and the main controller respectively, and to supply power to the gravity sensor and the main controller respectively; The gravity sensor includes a sensor chip, and the specific model of the sensor chip is DA380; The main controller includes a main control chip, and the specific model of the main control chip is NT96670; the sensor chip is connected to the main control chip through its SDA pin, SCL pin and INT pin; The main controller also includes a first master control resistor, a second master control resistor, a third master control resistor, a fourth master control resistor and a first master control capacitor; one end of the first master control resistor is connected to the power supply, and the other end of the first master control resistor is connected to the SDA pin of the sensor chip; one end of the second master control resistor is connected to the power supply, and the other end of the second master control resistor is connected to the SCL pin of the sensor core; one end of the third master control resistor is connected to the INT pin of the sensor chip, and the other end of the third master control resistor is connected to the main control chip; one end of the fourth master control resistor is connected to the common end of the third master control resistor and the sensor chip, and the other end of the fourth master control resistor is grounded; one end of the first master control capacitor is connected to the common end of the third master control resistor and the main control chip, and the other end of the first master control capacitor is grounded.

2. The driving recorder circuit using a gravity sensor as claimed in claim 1, characterized in that: The power supply includes a farad capacitor socket, a first power resistor, a second power resistor, a third power resistor, a fourth power resistor, a first power diode, a first power MOS tube, a second power MOS tube and a first power transistor; the farad capacitor socket corresponds to two connection terminals of an external farad capacitor and has two socket pins, one of the socket pins of the farad capacitor socket is grounded, and the other socket pin is connected to one end of the first power resistor, the other end of the first power resistor is connected to the cathode of the first power diode, and the anode of the first power diode is led out as a farad capacitor charging and discharging end; the source of the first power MOS tube is connected to the common end of the farad capacitor socket and the first power resistor, the drain of the first power MOS tube is connected to the drain of the second power MOS tube, and the The source of the second power MOS tube is connected to the anode of the first power diode; one end of the second power resistor is connected to the common end of the farad capacitor socket and the first power MOS tube, the other end of the second power resistor is connected to the gate of the first power MOS tube, and the gate of the second power MOS tube is connected to the common end of the first power MOS tube and the second power resistor; the collector of the first power transistor is connected to the gate of the first power MOS tube, the emitter of the first power transistor is grounded, the base of the first power transistor is connected to one end of the third power resistor, and the other end of the third power resistor is connected to the main control chip; one end of the fourth power resistor is connected to the common end of the first power transistor and the third power resistor, and the other end of the fourth power resistor is grounded.

3. The driving recorder circuit using a gravity sensor as claimed in claim 2, characterized in that: The power supply further includes a DCDC chip, and the specific model of the DCDC chip is TMI3411; the charging and discharging end of the farad capacitor led out from the anode of the first power diode is connected to the DCDC chip.

4. The driving recorder circuit using a gravity sensor as claimed in claim 3, characterized in that: The power supply also includes a first power inductor, a first power capacitor, a fifth power resistor and a sixth power resistor; one end of the first power inductor is connected to the DCDC chip, and the other end of the first power inductor is led out as an internal power supply end, and the internal power supply end led out from the DCDC chip is respectively connected to the sensor chip and the main control chip; one end of the first power capacitor is connected to an end of the first power inductor away from the DCDC chip, and the other end of the first power capacitor is connected to the DCDC chip; one end of the fifth power resistor is connected to the common end of the first power capacitor and the first power inductor, and the other end of the fifth power resistor is connected to one end of the sixth power resistor; The other end of the sixth power supply resistor is grounded; and a common end of the fifth power supply resistor and the sixth power supply resistor is connected to the DCDC chip.

5. The driving recorder circuit using a gravity sensor as claimed in claim 4, characterized in that: The power supply also includes an overvoltage and overcurrent protection chip and a second power diode; the anode of the second power diode is connected to the overvoltage and overcurrent protection chip, and the cathode of the second power diode is connected to the anode of the first power diode.

6. The driving recorder circuit using a gravity sensor as claimed in claim 5, characterized in that: The specific model of the overvoltage and overcurrent protection chip is WS3202E.

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