CAN / CANFD data recorder with built-in card reader

Abstract

The utility model relates to a CAN / CANFD data recorder with a built-in card reader, which comprises a controller and a memory, the controller is connected with an input interface and a first output interface, the CAN / CANFD data recorder also comprises a change-over switch and the card reader, the common end of the change-over switch is connected with the memory, the switching end of the change-over switch is connected with the controller and the card reader, and the card reader is connected with the controller. And the card reader is connected with the second output interface. According to the CAN data recorder, the problem that the reading speed and the reading cost of the CAN data recorder cannot be considered at the same time is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of data recorders, in particular to a CAN / CANFD data recorder with a built-in card reader. Background Art

[0002] The existing CAN data recorder reads the data of the CAN interface through the single-chip microcomputer and writes it into the TF card for storage. When the CAN data needs to be viewed, the data stored in the TF card is read by the single-chip microcomputer and then transmitted to the client PC through the USB interface. Figure 1 However, existing CAN data loggers cannot support high-speed TF cards at the same time, and the reading speed needs to be improved. However, if the reading speed is improved and a high-speed USB interface is used, a microcontroller adapted to the high-speed USB interface is required, or an external expansion chip is required to adapt to the high-speed USB interface, which is expensive. Utility Model Content

[0003] (1) Technical issues to be resolved

[0004] Based on the above problems, the utility model provides a CAN / CANFD data recorder with a built-in card reader, which solves the problem that the reading speed and cost of the CAN data recorder cannot be taken into account at the same time.

[0005] (2) Technical solution

[0006] Based on the above technical problems, the utility model provides a CAN / CANFD data recorder with a built-in card reader, including a controller and a memory, the controller being connected to an input interface and a first output interface, and also including a switching switch and a card reader, the common end of the switching switch being connected to the memory, the switching end of the switching switch being connected to the controller and the card reader, and the card reader being connected to the second output interface.

[0007] Furthermore, the switch includes an analog multiplexer.

[0008] Furthermore, the memory includes a TF card.

[0009] Furthermore, the controller includes a single chip microcomputer.

[0010] Furthermore, the input interface adopts a CANFD interface.

[0011] Furthermore, the first output interface adopts a USB 2.0 interface, and the second output interface adopts a USB 3.0 interface.

[0012] Furthermore, the analog multiplexer adopts TS3A27518EPWR.

[0013] Furthermore, the single chip microcomputer adopts STM32H723ZET6.

[0014] Furthermore, the card reader adopts GL3224.

[0015] (3) Beneficial effects

[0016] The above technical solution of the utility model has the following advantages:

[0017] (1) The utility model adds a switching switch and a card reader. The switching switch switches the communication between the TF card and the single-chip microcomputer and the communication between the TF card and the card reader, which does not affect the storage of CAN / CANFD data in the TF card. The USB interface can be selected to read and write the CAN / CANFD data stored in the TF card, and the added card reader can also be selected to read and write the CAN / CANFD data stored in the TF card. The added card reader is connected to the high-speed USB interface, which can greatly improve the reading and writing speed, so that CAN / CANFD can be supported without replacing the single-chip microcomputer or external expansion chip. The added switching switch and card reader are much cheaper, so that the storage and reading speed performance are greatly improved while effectively controlling the equipment cost.

[0018] (2) The utility model has a built-in card reader and a second output interface, which is convenient for reading and connecting, making the data recorder more portable;

[0019] (3) The utility model can be modified on the existing data recorder, further reducing the equipment cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The features and advantages of the present invention will be more clearly understood by referring to the accompanying drawings, which are schematic and should not be construed as limiting the present invention in any way. In the accompanying drawings:

[0021] Figure 1 This is a functional block diagram of a CAN data recorder of the prior art of the utility model;

[0022] Figure 2 This is a functional block diagram of a CAN / CANFD data recorder according to an embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of the principle of a CAN / CANFD data recorder according to an embodiment of the present utility model;

[0024] Figure 4 This is a schematic diagram of the terminal connection of a TF card according to an embodiment of the present utility model;

[0025] Figure 5 This is a terminal connection diagram of the CANFD interface of an embodiment of the present utility model;

[0026] Figure 6This is a schematic diagram of the terminal connections of the single chip microcomputer according to an embodiment of the present utility model;

[0027] Figure 7 This is a schematic diagram of terminal connections of a switch according to an embodiment of the present invention;

[0028] Figure 8 This is a schematic diagram of the terminal connections of the card reader according to an embodiment of the present utility model;

[0029] Figure 9 This is a physical picture of the CAN / CANFD data recorder according to an embodiment of the present utility model;

[0030] Figure 10 This is the actual end face of the CAN / CANFD data recorder according to the embodiment of the present utility model. DETAILED DESCRIPTION

[0031] The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0032] The present invention is a CAN / CANFD data recorder with a built-in card reader. Figure 2-3 As shown, the system includes a controller, a memory, a switch, and a card reader. The controller is connected to an input interface and a first output interface. The common terminal of the switch is connected to the memory. The switch terminal of the switch is connected to the controller and a card reader. The card reader is connected to a second output interface. Data is input into the controller from the input interface and then transferred to the memory via the switch for storage. When data is read from the memory, it is output from the first output interface via the switch and controller, or from the second output interface via the switch and card reader.

[0033] In this embodiment, the memory is a TF card, and the TF card holder connection diagram is as follows: Figure 4 As shown, it comes standard with a 32GSanDisk class 10 high-speed TF card, which can store 350 million frames of CAN / CANFD data.

[0034] In this embodiment, the input interface is a CANFD interface, such as Figure 5 As shown, three CANFD transceivers are used to input CAN / CANFD data. The CANFD transceiver can transmit more data at a faster rate.

[0035] In this embodiment, the first output interface adopts a USB-B interface, and other interfaces can also be used. The USB interface is connected to the PC end, and the PC end is used to configure the time, power supply, charge, and copy TF card data. However, the USB-B interface is USB2.0 and cannot read TF card data in real time, and the transmission speed is limited.

[0036] In this embodiment, the controller includes a single chip microcomputer, such as STM32H723ZET6. Figure 6 As shown, three CANFD transceivers are connected through three sets of CANTX and CANRX terminals for inputting data; the USB output interface is connected for outputting data; the NO and NC terminals of the switch are connected through the analog input / multiplexing port, and the SD terminal of the card reader is connected at the same time;

[0037] In this embodiment, the switch uses an analog multiplexer TS3A27518EPWR, such as Figure 7 As shown in the figure, the analog multiplexer is connected to the TF card through the COM terminal, and is connected to the analog input / multiplexing port of the microcontroller and the SD port of the card reader through the NO and NC terminals. The switch is used to switch the communication between the TF card and the microcontroller, and the communication between the TF card and the card reader. It does not affect the original CAN input data storage into the TF card, nor does it affect the original USB interface reading and writing the storage data in the TF card, and the storage data in the TF card can be read and written through the card reader.

[0038] In this embodiment, the card reader uses a high-speed card reader chip USB3.0, the USB3.0 reading speed is as high as 90MB / s, and the model is GL3224. Figure 8 As shown in the figure, the TF card can be read and written at high speed through the card reader, which greatly improves the reading and writing speed of data in the TF card.

[0039] In this embodiment, the second output interface adopts the USB 3.0 type C interface, and other high-speed interfaces can also be used to achieve faster transmission speeds. In addition, a power module is also provided to supply power to each chip.

[0040] The equipment cost of the newly added switch and card reader is much lower than replacing the microcontroller or external expansion chip with one that adapts to the high-speed USB interface. The unit price of the analog multiplexer TS3A27518EPWR used in this embodiment is only about 5 yuan / piece, and the unit price of the high-speed card reader chip GL3224 is only about 7 yuan / piece. However, the STM32 microcontroller that adapts to USB3.0 is much more expensive.

[0041] Therefore, in this embodiment, the microcontroller is connected to the CANFD interface to input data, and then input to the TF card inserted in the TF card holder through the analog multiplexer for storage. When reading the stored data in the TF card, the analog multiplexer plays a switching role, so that it can be output from the USB interface through the microcontroller and also from the type C interface through the card reader, which greatly improves the reading and writing speed of the data stored in the TF card. Figure 9-10 shown.

[0042] In summary, the CAN / CANFD data logger with a built-in card reader has the following advantages:

[0043] (1) The utility model adds a switching switch and a card reader. The switching switch switches the communication between the TF card and the single-chip microcomputer and the communication between the TF card and the card reader, which does not affect the storage of CAN / CANFD data in the TF card. The USB interface can be selected to read and write the CAN / CANFD data stored in the TF card, and the added card reader can also be selected to read and write the CAN / CANFD data stored in the TF card. The added card reader is connected to the high-speed USB interface, which can greatly improve the reading and writing speed, so that CAN / CANFD can be supported without replacing the single-chip microcomputer or external expansion chip. The added switching switch and card reader are much cheaper, so that the storage and reading speed performance are greatly improved while effectively controlling the equipment cost.

[0044] (2) The utility model has a built-in card reader and a second output interface, which is convenient for reading and connecting, making the data recorder more portable;

[0045] (3) The utility model can be modified on the existing data recorder, further reducing the equipment cost.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A CAN / CANFD data recorder with a built-in card reader, comprising a controller and a memory, wherein the controller is connected to an input interface and a first output interface, and is characterized in that: It also includes a switch and a card reader, wherein the common end of the switch is connected to the memory, the switching end of the switch is connected to the controller and the card reader, and the card reader is connected to the second output interface.

2. The CAN / CANFD data recorder with a built-in card reader according to claim 1, characterized in that: The switch includes an analog multiplexer.

3. The CAN / CANFD data recorder with a built-in card reader according to claim 1, characterized in that: The memory includes a TF card.

4. The CAN / CANFD data recorder with a built-in card reader according to claim 1, characterized in that: The controller includes a single chip microcomputer.

5. The CAN / CANFD data recorder with a built-in card reader according to claim 1, characterized in that: The input interface adopts a CANFD interface.

6. The CAN / CANFD data recorder with a built-in card reader according to claim 1, characterized in that: The first output interface adopts a USB 2.0 interface, and the second output interface adopts a USB 3.0 interface.

7. The CAN / CANFD data recorder with a built-in card reader according to claim 2, characterized in that: The analog multiplexer adopts TS3A27518EPWR.

8. The CAN / CANFD data recorder with a built-in card reader according to claim 4, characterized in that: The single chip microcomputer adopts STM32H723ZET6.

9. The CAN / CANFD data recorder with a built-in card reader according to claim 1, characterized in that: The card reader adopts GL3224.

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