CN216486126U - Vehicle fault diagnosis device and configuration bit array circuit - Google Patents
Vehicle fault diagnosis device and configuration bit array circuit Download PDFInfo
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- CN216486126U CN216486126U CN202122854490.XU CN202122854490U CN216486126U CN 216486126 U CN216486126 U CN 216486126U CN 202122854490 U CN202122854490 U CN 202122854490U CN 216486126 U CN216486126 U CN 216486126U
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Abstract
A configuration bit array circuit, comprising: the device comprises an interface, a pin configuration array and a signal transceiver group, wherein the interface comprises a plurality of pins; the pin configuration array comprises a plurality of configuration bit groups, each configuration bit group comprises a plurality of configuration bits, and one end of each configuration bit in the same configuration bit group is electrically connected with the same pin; the signal transceiver group comprises a plurality of signal transceivers, each signal transceiver comprises at least one signal transceiver port for receiving and/or transmitting signals, and the signal transceiver ports of the signal transceivers in the signal transceiver group are electrically connected with the other ends of the configuration bits in each configuration bit group in sequence; each of the configuration bits is switched between an on or off state to control whether a signal is transmitted between the interface and the signal transceiver group.
Description
Technical Field
The utility model relates to the technical field of vehicle fault diagnosis, in particular to a vehicle fault diagnosis device and a configuration bit array circuit.
Background
An On-Board Diagnostics (OBD) is a detection system for monitoring whether an automobile has a fault or exhaust emission exceeds the standard, the OBD is monitored by a sensor, an actuator and an ECU (electronic control unit), the working signals of components related to emission are monitored in real time to judge whether the automobile exhaust emission exceeds the standard, if some signals are abnormally changed and the emission exceeds the standard, the ECU judges that the components or circuits related to the signals have the fault, lights a fault indicator lamp and stores corresponding fault information. When a maintenance person overhauls, the vehicle fault diagnosis device can read fault information or write configuration parameter information from a diagnosis port of the OBD to an OBD system, the diagnosis ports are unified into 16 pins and are generally arranged in an inner decoration plate below a steering wheel.
When a vehicle fault diagnosis device performs read-write operation on an OBD system, it needs to obtain diagnosis communication with the OBD system according to an OBD diagnosis protocol, as shown in fig. 1, the vehicle fault diagnosis device generally includes an interface, a signal transceiver and a control unit, the interface is connected with a pin of an OBD diagnosis seat of a vehicle, and the signal transceiver is used for receiving an electrical signal on the interface, processing the electrical signal and transmitting the electrical signal to the control unit.
The OBD diagnostic protocols still in use on the market currently are as many as a dozen, and the vehicle fault diagnosis devices in the prior art generally support the use of one diagnostic protocol for diagnosis and detection with the vehicle, which brings inconvenience to vehicle diagnosis.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects of the prior art and provide a vehicle fault diagnosis device and a configuration bit array circuit which can use a plurality of diagnosis protocols to carry out vehicle. Furthermore, the utility model also provides a production method of the vehicle fault diagnosis device, which can configure different vehicle fault diagnosis devices according to the diagnosis protocol to be used, so that the production and the manufacture of the vehicle fault diagnosis device can meet different diagnosis and test requirements better.
The utility model is realized by the following technical scheme: a configuration bit array circuit, comprising: the device comprises an interface, a pin configuration array and a signal transceiver group, wherein the interface comprises a plurality of pins; the pin configuration array comprises a plurality of configuration bit groups, each configuration bit group comprises a plurality of configuration bits, and one end of each configuration bit in the same configuration bit group is electrically connected with the same pin; the signal transceiver group comprises a plurality of signal transceivers, each signal transceiver comprises at least one signal transceiver port for receiving and/or transmitting signals, and the signal transceiver ports of the signal transceivers in the signal transceiver group are electrically connected with the other ends of the configuration bits in each configuration bit group in sequence; each of the configuration bits is switched between an on or off state to control whether a signal is transmitted between the interface and the signal transceiver group.
In the configuration bit array circuit of the embodiment of the utility model, pins on an interface are connected with a plurality of signal transceivers in a signal transceiver group through a pin configuration array, and any one or more configuration bits are switched on or off on the pin configuration array, so that different pins can be connected with corresponding signal transceivers, and vehicle signals which are input by different pins and accord with different vehicle diagnosis protocols can be transmitted to corresponding signal transceivers; or vehicle signals output by different signal transceivers and conforming to different vehicle diagnostic protocols can be transmitted to corresponding pins. Therefore, the configuration bit array circuit provided by the embodiment of the utility model can support communication with vehicles by using various different diagnostic protocols, and can diagnose and detect different vehicles using different diagnostic protocols.
The pin configuration array is connected with the signal transceiver group through a pin, and the pin configuration array is connected with the signal transceiver group through a pin connection module.
Furthermore, the channel on-off module comprises at least one controlled switch, and each signal transceiving port of the signal transceiver group is electrically connected with the pin configuration array through one controlled switch; or the channel on-off module comprises at least one two-way controlled switch, and every two signal receiving and transmitting ports of the signal transceiver group are electrically connected with the pin configuration array through one two-way controlled switch.
Furthermore, the device also comprises a terminal resistance loading module, wherein the terminal resistance loading module is connected between the interface and the pin configuration array; or the terminal resistance loading module is connected between the pin configuration array and the signal transceiver group; the terminal resistor loading module is used for matching signal transmission impedance
Furthermore, the terminal resistor loading module comprises a terminal resistor switch and a plurality of terminal resistors connected with the terminal resistor switch, the terminal resistors are used for matching signal transmission impedance, and each terminal resistor is further connected with each signal transceiver one by one; and the terminal resistance switch is switched between a conducting state and a disconnecting state so as to control whether two ends of the terminal resistance are respectively connected with two signal receiving and transmitting ports of the signal transceiver or whether two ends of the terminal resistance are respectively connected with the other ends of two configuration bits in the same configuration bit group correspondingly connected with the signal transceiver.
Further, the device also comprises a conduction element which is connected to two ends of the configuration bit so as to conduct two ends of the configuration bit connected with the conduction element
Further, the conducting element is a resistor or a switch.
Based on the same utility model concept, the utility model also provides a vehicle fault diagnosis device, which is characterized by comprising: a control unit; and the configuration bit array circuit according to the above embodiment, wherein the signal transceiver group in the configuration bit array circuit is electrically connected to the control unit.
Drawings
Fig. 1 is a schematic structural diagram of a vehicle failure diagnosis apparatus of the related art.
Fig. 2 is a schematic structural diagram of a vehicle failure diagnosis apparatus according to an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a vehicle failure diagnosis apparatus according to an embodiment of the present invention.
Fig. 4 is an exemplary circuit schematic diagram of a terminal resistance selection module of the vehicle fault diagnosis apparatus of the present invention.
The technical scheme of the utility model is described in detail in the following with reference to the accompanying drawings.
Detailed Description
According to the utility model, the lines between the pins on the interface of the vehicle fault diagnosis device and the signal transceiver are arranged in advance, and the prearranged lines can be communicated and configured according to the required OBD diagnosis protocol in use, so that the diagnosis device with the same specification can be in diagnosis communication with OBD systems using different OBD diagnosis protocols. The following examples are intended to illustrate the details.
Please refer to fig. 2, which is a schematic structural diagram of a vehicle fault diagnosis device of the present invention, the device includes a configuration bit array circuit 10 and a control unit 20, wherein an interface 11 of the configuration bit array circuit 10 can be connected to a vehicle OBD diagnosis seat (not shown) to obtain an electrical signal from the vehicle OBD diagnosis seat, or transmit the electrical signal output by the configuration bit array circuit 10 to the vehicle OBD diagnosis seat through the interface 11. In addition, the signal transceiver 141 in the configuration bit array circuit 10 also communicates with the control unit 20. The signal transceiver 141 may output a signal to the control unit 20, and the control unit 20 may also output a signal to the signal transceiver 141. The control unit 20 includes, but is not limited to, one or a combination of any of MCU, MPU, DPU, CPU, ASIC, and the like.
As will be further described below with respect to the configuration bit array circuit 10, the configuration bit array circuit 10 includes an interface 11, a pin configuration array 12, a channel on/off module 13, and a signal transceiver group 14, where the interface 11 is provided with a plurality of pins. When vehicle fault diagnosis is carried out, the pin is communicated with a pin on an OBD diagnosis seat of the vehicle. A user can turn on or off the corresponding configuration bits 121 on the pin configuration array 12 according to different diagnostic protocols to be used, so as to connect different pins with the corresponding signal transceivers 141, and vehicle signals input by different pins and conforming to different vehicle diagnostic protocols can be transmitted to the corresponding signal transceivers 141; or vehicle signals output by different signal transceivers 141 that conform to different vehicle diagnostic protocols, may be transmitted to the corresponding pins. The channel switching module 13 switches between on and off states to control whether signals are transmitted between the pin array 12 and the signal transceiver group 14. The signal transceiver group 14 processes the received electrical signals according to its configured diagnostic protocol or communication protocol and then sends the processed electrical signals to the interface 11 or the control unit 20.
In the present embodiment, each signal transceiver 141 includes at least one signal transceiving port 142 for receiving and/or transmitting signals. Optionally, there are two signal transceiving ports 142 of each signal transceiver 141. Specifically, the signal transceiver group 14 includes a plurality of signal transceivers 141, and each signal transceiver 141 may have a built-in program capable of processing/receiving/transmitting a signal of the same kind that conforms to the diagnostic protocol specification. Or each signal transceiver 141 has a different program built therein to process/receive/transmit signals conforming to different diagnostic protocol specifications. In other embodiments, some of signal transceivers 141 may be capable of processing/receiving/transmitting signals that conform to the diagnostic protocol specification, and other signal transceivers 141 may have other programs built in to process/receive/transmit signals that conform to other diagnostic protocol specifications.
The pin configuration array 12 includes a plurality of configuration bit groups, each configuration bit group including a plurality of configuration bits 121. One end of each configuration bit 121 in any configuration bit group is electrically connected to the same pin of the interface 11, and the other end of each configuration bit 121 is electrically connected to one signal transceiving port 142 of the signal transceiver group 14. The configuration bit 121 is used for installing a conducting element (not shown), and two ends of the configuration bit 121 are conducted after the conducting element is installed. In a specific implementation, the conducting element may be an electronic element such as a resistor or a switch that can conduct a line.
The channel on-off module 13 includes a plurality of controlled switches 131, each controlled switch 131 controls on-off between a signal transceiving port 142 and the pin configuration array 12, the controlled switch 131 may be a controllable switch element such as a relay, a triode switch, an optocoupler, or the like, and the on-off of the controlled switch 131 may be controlled by a control unit or other control elements such as an FPGA, a register, a latch, or the like. Referring to fig. 3, which is a schematic structural diagram of a vehicle fault diagnosis apparatus according to another embodiment, the channel switching module 13 includes a plurality of two-way controlled switches 132, each of the two-way controlled switches 132 controls switching between two of the signal transceiving ports 142 of any of the signal transceivers 141 and the pin configuration array 12, the two-way controlled switches 132 may be controllable switch elements such as two-way relays, and opening and closing of the two-way controlled switches 132 may be controlled by a control unit or other control elements such as FPGAs, registers, and latches.
The specific diagnostic protocol used in the on-board OBD system with the vehicle may be, for example, the CAN bus protocol. The CAN bus protocol is a protocol for communication between the vehicle OBD system and the vehicle fault diagnosis device, which specifies that the physical layer bus of the CAN requires two 120 Ω termination resistors for matching the signal transmission impedance, otherwise the CAN bus cannot establish a connection, and therefore in a preferred embodiment, the configuration bit array circuit further includes a termination resistor loading module 15, the termination resistor loading module 15 is connected between the interface 11 and the pin configuration array 12, or the termination resistor loading module 15 is connected between the pin configuration array 12 and the signal transceiver group 14, and the termination resistor loading module 15 is used for controlling whether to load the termination resistors on the lines connecting the signal transceiver group 14 and the pins of the interface 11 to match the signal transmission impedance.
Referring to fig. 4, which is an exemplary schematic circuit diagram of the terminating resistor loading module 15, the terminating resistor loading module 15 includes a terminating resistor switch 151 and at least one terminating resistor 152, where the terminating resistor switch 151 is electrically connected to the terminating resistor 152, and the terminating resistor switch 151 is used to control the terminating resistor loading circuit to switch between on or off states. Termination resistor 152 is used to match the signal transmission impedance. Two ends of any terminal resistor loading circuit are electrically connected with two signal transceiving ports 142 of any signal transceiver 141 so as to realize normal CAN bus protocol communication. In another embodiment, two ends of each termination resistor loading circuit are electrically connected to any two pins of the interface 11 in sequence, so as to implement normal CAN bus protocol communication. When terminating resistor switch 151 is closed, terminating resistor 152 is loaded on the line that transmits signals between signal transceiver 141 and interface 11.
In the embodiment of the present invention, the terminating resistor switch 151 includes a plurality of sub-switch circuits (not shown), each of which includes a controlled terminal and two input/output terminals, and the controlled terminal of each sub-switch circuit can receive a control signal output by the control unit 20 or other elements. The number of sub-switch circuits is the same as the number of signal transceivers. In a specific implementation, the terminating resistor switch 151 may be a controllable switch element such as a relay, a triode switch, or a chip integrating a plurality of electrically controlled switches.
The two signal transceiving ports 142 of the signal transceiver 141 are connected to the corresponding configuration bits 121 in the pin configuration array 12 through the two-way controlled switch 132, or the two signal transceiving ports 142 of the signal transceiver 141 are connected to the corresponding configuration bits 121 in the pin configuration array 12 through the controlled switch 131. Any one of the signal transceivers 141, the controlled switch 131 connected to the signal transceiver 141, the configuration bit 121 connected to the controlled switch 131, the interface 11, and any adjacent transmission line therebetween constitute one channel, or any one of the signal transceivers 141, the controlled switch 131 connected to the signal transceiver 141, the configuration bit 121 connected to the two-way controlled switch 132, the interface 11, and any adjacent transmission line therebetween constitute one channel.
As shown in fig. 4, each channel includes two signal lines. Two input/output terminals of any one of the sub-switch circuits are connected one-to-one with two signal lines of one of the channels. Further, one of the input/output terminals of the sub-switch circuit is further connected to one end of the termination resistor 152, and the other end of the termination resistor 152 is further connected to a signal line in the channel. If the sub-switch circuit is turned on, two ends of the termination resistor 152 are respectively connected to two signal lines in the channel one by one, that is, two ends of the termination resistor 152 are respectively connected to two signal transceiving ports 142 of the signal transceiver 141, or whether two ends of the termination resistor 152 are respectively connected to the other ends of two configuration bits 121 in the same configuration bit group correspondingly connected to the signal transceiver 141, or whether two ends of the termination resistor 152 are bridged to two signal lines in the channel. Therefore, the termination resistor 152 is connected to the channel, so that the impedance of signal transmission can be matched, and the anti-interference performance and reliability of signal transmission can be improved.
Different diagnostic protocols can be adapted during the production of the vehicle fault diagnosis device according to the utility model. When the configuration is performed, the corresponding pin on the interface 11 and the corresponding signal transceiving port 142 of the signal transceiver 141 are determined according to the determined diagnostic protocol or communication protocol, and then the conducting element is installed on the configuration bit 121 commonly connected with the pin of the interface 11 and the signal transceiving port 142, so that the vehicle fault diagnosis device can communicate with the vehicle-mounted diagnosis system according to the required OBD diagnostic protocol or communication protocol.
When the configured vehicle fault diagnosis device is communicated with the diagnosis of the vehicle-mounted diagnosis system, the pins of the interface 11 are communicated with the pins of the OBD diagnosis seat of the vehicle, and vehicle signals can be read from the OBD system or configuration information can be written into the OBD system. When reading a vehicle signal from the OBD system, the pins of the interface 11 transmit the vehicle signal output from the OBD diagnostic socket pins to the configuration bit array circuit 10. At this time, the configuration bit 121 electrically connected to the pin and configured in the on state outputs the vehicle signal to the channel on/off module 13 in the configuration bit array circuit 10. At the same time, the corresponding controlled switch 131 in the channel switching module 13 is closed, so that the signal transceiving port 142 of the signal transceiver 141 communicates with the conducted configuration bit 121. So that the vehicle signal is transmitted to the signal transceiver 141 by the pins of the interface 11, the turned-on configuration bits 121 electrically connected to the corresponding pins. The signal transceiver 141 may convert the electrical signal and transmit the converted signal to the control unit 20.
When writing configuration information to the OBD system, the control unit 20 sends a configuration signal to the signal transceiver 141, and the signal transceiver 141 processes the configuration signal into a signal suitable for output to the on-board OBD system. While the controlled switch 131 electrically connected to the signal transceiver 141 is closed to communicate the signal transceiver 141 with the configuration bit 121 configured in the on state. The processed signal can be transmitted to the pins of the OBD diagnostic socket through the pins of the interface 11 electrically connected to the configuration socket 121.
In the configuration bit array circuit of the embodiment of the utility model, pins on an interface are connected with a plurality of signal transceivers in a signal transceiver group through a pin configuration array, and any one or more configuration bits are switched on or off on the pin configuration array, so that different pins can be connected with corresponding signal transceivers, and vehicle signals which are input by different pins and accord with different vehicle diagnosis protocols can be transmitted to corresponding signal transceivers; or vehicle signals output by different signal transceivers and conforming to different vehicle diagnostic protocols can be transmitted to corresponding pins. Therefore, the configuration bit array circuit provided by the embodiment of the utility model can support communication with vehicles by using various different diagnostic protocols, and can diagnose and detect different vehicles using different diagnostic protocols.
The present invention is not limited to the above-described embodiments, and various modifications and variations of the present invention are intended to be included within the scope of the claims and the equivalent technology of the present invention if they do not depart from the spirit and scope of the present invention.
Claims (8)
1. A configuration bit array circuit, comprising:
an interface comprising a plurality of pins;
the pin configuration array comprises a plurality of configuration bit groups, each configuration bit group comprises a plurality of configuration bits, and one end of each configuration bit in the same configuration bit group is electrically connected with the same pin;
a signal transceiver group, wherein the signal transceiver group comprises a plurality of signal transceivers, the signal transceivers comprise at least one signal transceiving port for receiving and/or transmitting signals, and the signal transceiving port of each signal transceiver in the signal transceiver group is electrically connected with the other end of each configuration bit in each configuration bit group in sequence; each of the configuration bits is switched between an on or off state to control whether a signal is transmitted between the interface and the signal transceiver group.
2. The configuration bit array circuit of claim 1, further comprising a channel switching module that switches between on and off states to control whether signals are transmitted between the pin configuration array and the signal transceiver bank.
3. The configuration bit array circuit of claim 2, wherein the channel switching module comprises at least one controlled switch, and each signal transceiving port of the signal transceiver group is electrically connected to the pin configuration array through one controlled switch; or the channel on-off module comprises at least one two-way controlled switch, and every two signal receiving and transmitting ports of the signal transceiver group are electrically connected with the pin configuration array through one two-way controlled switch.
4. The configuration bit array circuit of claim 1, further comprising a termination resistance loading module connected between the interface and the pin configuration array; or the terminal resistance loading module is connected between the pin configuration array and the signal transceiver group; the terminal resistance loading module is used for matching signal transmission impedance.
5. The configuration bit array circuit according to claim 4, wherein the termination resistance loading module comprises a termination resistance switch and a plurality of termination resistances connected to the termination resistance switch, the termination resistances being configured to match a signal transmission impedance, each of the termination resistances being further connected to each of the signal transceivers one by one; and the terminal resistance switch is switched between a conducting state and a disconnecting state so as to control whether two ends of the terminal resistance are respectively connected with two signal receiving and transmitting ports of the signal transceiver or whether two ends of the terminal resistance are respectively connected with the other ends of two configuration bits in the same configuration bit group correspondingly connected with the signal transceiver.
6. The configuration bit array circuit of any of claims 1-5, wherein: the circuit also comprises a conduction element which is connected to two ends of the configuration bit so as to conduct two ends of the configuration bit connected with the conduction element.
7. The configuration bit array circuit of claim 6, wherein: the conducting element is a resistor or a switch.
8. A vehicle failure diagnosis device characterized by comprising: a control unit; and a configuration bit array circuit as claimed in any one of claims 1 to 7, the set of signal transceivers in the configuration bit array circuit being electrically connected to the control unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122854490.XU CN216486126U (en) | 2021-11-19 | 2021-11-19 | Vehicle fault diagnosis device and configuration bit array circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122854490.XU CN216486126U (en) | 2021-11-19 | 2021-11-19 | Vehicle fault diagnosis device and configuration bit array circuit |
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| CN216486126U true CN216486126U (en) | 2022-05-10 |
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| CN202122854490.XU Active CN216486126U (en) | 2021-11-19 | 2021-11-19 | Vehicle fault diagnosis device and configuration bit array circuit |
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