Monitoring device and vehicle

Abstract

The invention relates to the technical field of automobile braking, in particular to a monitoring device and a vehicle. According to the brake detection device, under the condition that the vehicle is not braked, each transistor in the four transistors in the H-bridge circuit can be conducted one by one for testing, and whether the function of each transistor in the H-bridge circuit is damaged or not is determined according to the first voltage difference. If the first voltage difference meets the first condition (for example, the first voltage difference is within the first preset voltage range), it can be confirmed that a transistor in the H-bridge circuit is damaged, the vehicle loses the braking function, and a first warning signal is generated in time. Therefore, the user can receive the first warning signal before braking the vehicle, sufficient time can be reserved to take safety measures, and the driving safety of the user is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automobile braking, in particular to a monitoring device and a vehicle. BACKGROUND

[0002] In the process of driving, the driving chip of the brake motor can control the motor braking to realize vehicle braking in response to the brake request of the user.

[0003] At the hardware level, the driving chip can control the switching state of a plurality of transistors for controlling the motor, control the running direction of the motor, such as forward rotation and reverse rotation. When the transistors fail, the brake assembly will fail synchronously.

[0004] However, in the scenario where the automobile needs to be parked, the existing scheme needs to receive the brake request of the user to report the damage of the brake assembly (such as the damage of the transistor), but at this time the user may be in the process of driving, and the damaged brake assembly causes the vehicle to be difficult to brake, which may pose a greater threat to the personal safety of the user. SUMMARY

[0005] The present application provides a monitoring device and a vehicle, which are used to solve the problem of low driving safety caused by brake assembly damage when the automobile brakes.

[0006] In a first aspect, the embodiments of the present application provide a monitoring device for monitoring a brake circuit of a vehicle, the brake circuit comprising an H-bridge circuit, the H-bridge circuit comprising four transistors, the four transistors being respectively arranged on four bridge arms of the H-bridge circuit, the first bridge arm and the second bridge arm of the four bridge arms having a first connection point, the third bridge arm and the fourth bridge arm of the four bridge arms having a second connection point, the first connection point and the second connection point being used to connect a load; the monitoring device comprising a processing module and a first sampling module, the processing module being used to control a first transistor of the four transistors to be turned on and control other transistors of the four transistors to be turned off; the first sampling module being used to collect a first pressure difference between the first connection point and the second connection point in the case that the first transistor is turned on and the other transistors are turned off, determine a second pressure difference according to the first pressure difference, and send the second pressure difference to the processing module; the processing module being further used to generate a first warning signal when the second pressure difference meets a first condition, wherein the first condition comprises that the second pressure difference is within a first preset voltage range.

[0007] It can be understood that the brake detection device can test each of the four transistors in the H-bridge circuit one by one when the vehicle has not yet braked, and determine whether each transistor (corresponding to the first H-bridge transistor, the second H-bridge transistor, the third H-bridge transistor or the fourth H-bridge transistor) in the H-bridge circuit is functionally damaged according to the first pressure difference. If the first pressure difference meets the first condition (for example, the first pressure difference is within the first preset voltage range), it can be confirmed that there is a transistor damage in the H-bridge circuit, the vehicle loses the brake function, and the first warning signal is generated in time. So that the user can receive the first warning signal before braking the vehicle (for example, when the vehicle is just started and has not yet traveled), sufficient time can be reserved to take safety measures (such as staying in place and waiting for maintenance), and the driving safety of the user is improved.

[0008] In some possible implementations of the first aspect, the processing module is further configured to control the second transistor of the four transistors to be turned on, and control the other transistors of the four transistors to be turned off; and the first sampling module is further configured to collect a third pressure difference between the first connection point and the second connection point when the second transistor is turned on and the other transistors are turned off, determine a fourth pressure difference according to the third pressure difference, and generate a second warning signal when the fourth pressure difference meets a second condition, where the second condition includes that the fourth pressure difference is within the first preset voltage range.

[0009] In some embodiments of the present application, the monitoring device can further include a warning module connected with a microcontroller unit (MCU), and the processing module can light a warning light in the warning module for indicating brake failure based on the first warning signal or the second warning signal, for example, a red light can be turned on to indicate brake failure, so as to achieve the effect of warning the user. Thus, the user can monitor the brake failure in advance and timely warn the user when the brake function just fails before issuing a brake request.

[0010] It can be understood that the warning module includes but is not limited to a warning light, a display screen and a projector, as long as it can warn the user of brake failure based on the first warning signal. For the sake of brevity, other components included in the warning module are not enumerated one by one.

[0011] In some possible implementations of the first aspect, the first sampling module includes a first sampling unit and a second sampling unit, and the first sampling module determines the second pressure difference according to the first pressure difference, including: the first sampling unit divides the first voltage output by the first connection point to obtain a second voltage; the second sampling unit divides the third voltage output by the second connection point to obtain a fourth voltage; and the difference between the second voltage and the fourth voltage is determined as the second pressure difference.

[0012] It can be understood that the second pressure difference increases, the first pressure difference decreases, and the second pressure difference decreases. Therefore, the second pressure difference can effectively reflect the change of the first pressure difference, that is, the second pressure difference can timely reflect the change of the current pressure difference between the first connection point B1 and the second connection point B2, and can effectively monitor whether the current measured transistor (for example, the first transistor or the second transistor in the above example) is damaged. The structure is simple and accurate for sampling, so as to timely collect the second pressure difference and efficiently realize the warning of brake failure.

[0013] In some possible implementations of the first aspect, the first sampling unit includes a first resistor and a second resistor, one end of the first resistor is connected to the first connection point, the other end of the first resistor is connected to one end of the second resistor, and the other end of the second resistor is grounded; and the second sampling unit includes a third resistor and a fourth resistor, one end of the third resistor is connected to the second connection point, the other end of the third resistor is connected to one end of the fourth resistor, and the other end of the fourth resistor is grounded.

[0014] It can be understood that the second voltage can be determined based on the voltage value of the first voltage output by the first connection point, the resistance value of the first resistor and the resistance value of the second resistor. The fourth voltage can be determined based on the voltage value of the third voltage output by the second connection point, the resistance value of the third resistor and the resistance value of the fourth resistor.

[0015] In some possible implementations of the first aspect, the monitoring device further includes a first power supply and a first switch, the first power supply, the first switch and the first sampling module are sequentially connected, and the processing module is further configured to control the first switch to periodically turn on and off.

[0016] In some embodiments, the processing module can control the first switch to turn on at a first preset period to realize periodic detection of any one of the four transistors in the H-bridge circuit (corresponding to the first transistor or the second transistor in the above example).

[0017] In some embodiments, the first preset period can be 10 milliseconds, 20 milliseconds or 30 milliseconds, which is not limited herein.

[0018] In some possible implementations of the first aspect, the processing module is further configured to control the first switch to turn off in response to a brake request of a user.

[0019] It can be understood that in the case that the user needs to brake the vehicle, if any one of the four transistors in the H-bridge circuit is controlled to turn on, it may affect braking, causing the motor module to rotate forward or reverse, and causing brake failure. Therefore, in the case that the brake request of the user is received, the processing module needs to stop monitoring the four transistors in the H-bridge circuit to avoid negative impact on normal braking of the vehicle.

[0020] In some possible implementations of the first aspect, the braking circuit further includes a second power supply and a third transistor, the first bridge arm and the third bridge arm of the H-bridge circuit further have a third connection point, the second power supply, the third transistor and the third connection point are sequentially connected, the third transistor includes a first body diode, a positive electrode of the first body diode is connected to the power supply, a negative electrode of the first body diode is connected to the third connection point, and the monitoring device further includes a second sampling module, the second sampling module is configured to collect a fifth voltage difference between a source electrode of the third transistor and a drain electrode of the third transistor, obtain a sixth voltage difference based on the fifth voltage difference, and send the sixth voltage difference to the processing module; and the processing module is configured to obtain the sixth voltage difference, and generate a third warning signal when it is determined that the sixth voltage difference meets a third condition, where the third condition includes that the sixth voltage difference is within a second preset voltage range.

[0021] It can be understood that the third transistor has a function of preventing damage to the second power supply after the second power supply is reversely connected, and the second sampling module can be used to monitor whether the third transistor is damaged.

[0022] It can be understood that the sixth voltage difference within the second preset voltage range can represent that the field effect transistor of the third transistor is damaged but the first body diode is still intact, and the processing module generates the third warning signal, which can be used to alarm the user that the braking function is about to be damaged.

[0023] Exemplarily, the second preset voltage range can be [200mV, 600mV].

[0024] In some other embodiments, the processing module can be further configured to generate a fourth warning signal when it is determined that the sixth voltage difference meets a fourth condition, where the fourth condition includes that the sixth voltage difference is within a third preset voltage range.

[0025] It can be understood that the sixth voltage difference within the third preset voltage range can represent that the field effect transistor of the third transistor and the first body diode are both damaged, and the processing module generates the fourth warning signal, which can be used to alarm the user that the braking function is invalid.

[0026] Exemplarily, the third preset voltage range can be (600mV, +∞).

[0027] In some embodiments of the present application, the monitoring device can further include a warning module connected to the MCU, and the processing module can turn on a warning light in the warning module for indicating that the braking function is about to be invalid based on the third warning signal, for example, a yellow light can be turned on to indicate that the braking function is about to be invalid. This enables the user to be warned before the braking function is invalid, so that the user can drive away from a dangerous driving area in time or stop the vehicle in time to drive, thereby ensuring the driving safety of the user.

[0028] The processing module can also light up a warning light in the warning module for indicating brake failure based on the fourth warning signal, for example, a red light can be lit up to indicate brake failure. Thus, the user can monitor the brake failure in advance and be timely warned before making a brake request when the brake function just fails.

[0029] It can be understood that the warning module includes but is not limited to a warning light, a display screen and a projector, as long as it can perform corresponding warning for the user based on the third warning signal or the fourth warning signal.

[0030] In some possible implementations of the first aspect, the monitoring device further includes a charge pump and a second switch, the charge pump and the second switch are connected with the second sampling module in sequence, the processing module is further configured to control the second switch to be periodically turned on, and the charge pump is configured to supply power for the second sampling module when the second switch is turned on. The processing module is configured to acquire the sixth voltage difference, and the processing module is further configured to acquire the sixth voltage difference when the second switch is turned on.

[0031] In some embodiments, the processing module can control the second switch to be turned on based on a second preset period. Exemplarily, the second preset period can be 10 milliseconds, 20 milliseconds or 30 milliseconds, which is not limited herein.

[0032] In some possible implementations of the first aspect, the processing module is further configured to control the second switch to be turned off in response to a brake request of the user.

[0033] It can be understood that, in the case that the user needs to brake the vehicle, if the second switch is controlled to be turned on, the second sampling module samples the fifth voltage difference between the source and the drain of the third transistor, which can affect the power supply of the H-bridge circuit by the second power supply, and further affect the brake function, causing brake failure. Therefore, in the case that the brake request of the user is received, the processing module turns off the second switch in response to the brake request, so as to timely stop monitoring the third transistor, thereby avoiding negative impact on normal braking of the vehicle.

[0034] In some possible implementations of the first aspect, the second sampling module includes an operational amplifier, and the second sampling module obtains the sixth voltage difference from the fifth voltage difference, including: amplifying the fifth voltage difference to the sixth voltage difference by the operational amplifier.

[0035] In the second aspect, the embodiments of the present application further provide a vehicle, which includes the monitoring device provided in the first aspect or various possible implementations of the first aspect.

[0036] It can be understood that the beneficial effects of the second aspect can refer to the beneficial effects of the first aspect or various possible implementations of the first aspect, which are not repeated herein.

[0037] The technical scheme provided by the embodiments of the present application brings at least the following beneficial effects:

[0038] The brake detection device can test each of the four transistors in the H-bridge circuit one by one when the vehicle has not yet braked, and determine whether each transistor (corresponding to the first H-bridge transistor, the second H-bridge transistor, the third H-bridge transistor or the fourth H-bridge transistor) in the H-bridge circuit is functionally damaged according to the first pressure difference. If the first pressure difference meets the first condition (for example, the first pressure difference is within the first preset voltage range), it can be confirmed that there is a transistor damage in the H-bridge circuit, the vehicle loses the brake function, and a first warning signal is generated in time. So that the user can receive the first warning signal before braking the vehicle (for example, when the vehicle is just started and has not yet traveled), and sufficient time can be reserved to take safety measures (such as staying in place and waiting for maintenance), thereby improving the user's driving safety. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 A schematic diagram of a brake circuit in a vehicle is shown;

[0040] Figure 2 A schematic diagram of a brake failure according to some embodiments of the present application is shown;

[0041] Figure 3 A schematic diagram of a monitoring device including a first sampling module according to some embodiments of the present application is shown;

[0042] Figure 4 A schematic diagram of a circuit structure of a first sampling module according to some embodiments of the present application is shown;

[0043] Figure 5 A schematic diagram of a circuit structure of a first sampling unit and a second sampling unit according to some embodiments of the present application is shown;

[0044] Figure 6 A schematic diagram of a circuit structure of a monitoring device including a first switch according to some embodiments of the present application is shown;

[0045] Figure 7A A schematic diagram of a circuit connection of a protection transistor according to some embodiments of the present application is shown;

[0046] Figure 7B Another scenario of brake failure according to some embodiments of the present application is shown;

[0047] Figure 8 A schematic diagram of a connection structure of a monitoring device including a second sampling module according to some embodiments of the present application is shown;

[0048] Figure 9 Fig. 11 shows a schematic diagram of a circuit connection structure of a monitoring device including a second switch according to some embodiments of the present application;

[0049] Figure 10 Fig. 12 shows a schematic diagram of a circuit connection manner of an operational amplifier according to some embodiments of the present application;

[0050] Figure 11 Fig. 13 shows a schematic diagram of a circuit connection structure of another monitoring device according to some embodiments of the present application;

[0051] Figure 12 Fig. 14 shows a schematic diagram of a frame structure of a vehicle according to some embodiments of the present application. DETAILED DESCRIPTION

[0052] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the embodiments of the present application will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0053] For the convenience of description, the embodiments of the present application will be described in detail below taking a vehicle as an example.

[0054] Figure 1 Fig. 15 shows a schematic diagram of a braking circuit in a vehicle. Figure 2 Fig. 16 shows a schematic diagram of a braking fault according to some embodiments of the present application.

[0055] Reference Figure 1 The vehicle can include a processing module 101, an H-bridge circuit 102 and a motor module L driven by the H-bridge circuit 102.

[0056] The processing module 101 can include a microcontroller unit (MCU) and an H-bridge driving chip.

[0057] The H-bridge circuit 102 includes four transistors, which are respectively arranged on four bridge arms of the H-bridge circuit 102. The first bridge arm and the second bridge arm of the four bridge arms have a first connection point B1, and the third bridge arm and the fourth bridge arm of the four bridge arms have a second connection point B2, and the first connection point B1 and the second connection point B2 are used to connect a load.

[0058] In some embodiments, the load can be the motor module L.

[0059] It can be understood that the H-bridge driving chip can send corresponding signals (for example, a GH1 signal for controlling the first H-bridge transistor F2, a GH2 signal for controlling the second H-bridge transistor F3, a GL1 signal for controlling the third H-bridge transistor F4, and a GL2 signal for controlling the fourth H-bridge transistor F5) to the gates of the four transistors to control the on-off of the four transistors, thereby controlling the forward rotation (corresponding to the clockwise rotation), the reverse rotation (corresponding to the counterclockwise rotation), and the stop of the motor module L.

[0060] For example, in response to the forward rotation control instruction sent by the MCU, the H-bridge driving chip can control the first H-bridge transistor F2 and the fourth H-bridge transistor F5 to be turned on and the other two transistors to be turned off, so that the motor module L is rotated forward. For another example, in response to the reverse rotation control instruction sent by the MCU, the H-bridge driving chip can control the second H-bridge transistor F3 and the third H-bridge transistor F4 to be turned on and the other two transistors to be turned off, so that the motor module L is rotated reversely.

[0061] In the scenario of vehicle braking, the MCU can control the first H-bridge transistor F2 and the third H-bridge transistor F4 to be turned off and the other two transistors to be turned on, or control the second H-bridge transistor F3 and the fourth H-bridge transistor F5 to be turned off and the other two transistors to be turned on, by using the H-bridge driving chip, in response to the braking instruction (for example, the user steps on the brake pedal) sent by the user, to stop the rotation of the rotor of the motor module L, thereby achieving the braking function.

[0062] Reference Figure 2 If any one of the first H-bridge transistor F2, the second H-bridge transistor F3, the third H-bridge transistor F4, or the fourth H-bridge transistor F5 is damaged (for example, the field effect transistor in any one of the transistors is damaged), at this time, the vehicle has lost the braking function.

[0063] However, since the braking function failure can be detected only after receiving the user braking request, the user is difficult to drive to a safe area in time, and the driving is dangerous.

[0064] Therefore, in order to solve the problem that the vehicle cannot detect the damage of the brake assembly when braking, thereby reducing the driving safety, the embodiment of the present application provides a monitoring device for monitoring the brake circuit of the vehicle. The brake circuit includes an H-bridge circuit, and the H-bridge circuit includes four transistors. The four transistors are respectively arranged on four bridge arms of the H-bridge circuit. The first bridge arm and the second bridge arm of the four bridge arms have a first connection point. The third bridge arm and the fourth bridge arm of the four bridge arms have a second connection point. The first connection point and the second connection point are used to connect a load. The monitoring device includes a processing module and a first sampling module. The processing module is used to control a first transistor of the four transistors to be turned on, and control other transistors of the four transistors to be turned off. The first sampling module is used to collect a first pressure difference between the first connection point and the second connection point when the first transistor is turned on and the other transistors are turned off. The second pressure difference is determined according to the first pressure difference, and the second pressure difference is sent to the processing module. The processing module is also used to generate a first warning signal when it is determined that the second pressure difference meets a first condition. The first condition includes that the second pressure difference is within a first preset voltage range.

[0065] It can be understood that the brake detection device can turn on each of the four transistors in the H-bridge circuit one by one to test the function of each of the four transistors. Whether each transistor (corresponding to the first H-bridge transistor F2, the second H-bridge transistor F3, the third H-bridge transistor F4 or the fourth H-bridge transistor F5) in the H-bridge circuit is functionally damaged can be determined according to the first pressure difference. If the first pressure difference meets the first condition (for example, the first pressure difference is within the first preset voltage range), it can be determined that there is a damaged transistor in the H-bridge circuit, and the vehicle loses the brake function. The first warning signal can be generated in time. Therefore, the user can receive the first warning signal before braking the vehicle (for example, when the vehicle is just started and has not been driven), and sufficient time can be reserved to take safety measures (for example, staying in place and waiting for maintenance), thereby improving the driving safety of the user.

[0066] The monitoring device provided by the embodiment of the present application will be described in detail below with reference to the relevant drawings.

[0067] Figure 3 A schematic diagram of a frame structure of a monitoring device including a first sampling module according to some embodiments of the present application is shown.

[0068] Reference Figure 3 It can be understood that the brake circuit of the vehicle includes the H-bridge circuit 102. The specific implementation of how the four transistors in the H-bridge circuit 102 drive the load (for example, the motor module L) can be referred to the relevant implementation of the above Figure 1 For the sake of brevity, it will not be repeated here.

[0069] In some embodiments, the motor module L can include a brushed DC motor BDC and a shunt resistor R shunt (shunt resistor) (not shown in the figure). Exemplarily, one end of the shunt resistor R shunt is connected to the first connection point B1, and the other end of the shunt resistor R shunt is connected to one end of the brushed DC motor BDC, and the other end of the brushed DC motor BDC is connected to the second connection point B2.

[0070] In some embodiments of the present application, the monitoring device can include a processing module 101 and a first sampling module 104.

[0071] The processing module 101 can be configured to control a first transistor of the four transistors to be turned on, and control the other transistors of the four transistors to be turned off. For example, the processing module 101 can be configured to control any one of the four transistors (corresponding to the first transistor) to be turned on, and control the other transistors to be turned off, so as to realize the function monitoring of the first transistor, and determine whether the braking circuit still has a perfect braking function.

[0072] The first sampling module 104 can be configured to, in a case that the first transistor is turned on and the other transistors are turned off, collect a first pressure difference between the first connection point B1 and the second connection point B2, determine a second pressure difference according to the first pressure difference, and send the second pressure difference to the processing module 101.

[0073] The processing module 101 is further configured to generate a first warning signal when it is determined that the second pressure difference satisfies a first condition, wherein the first condition includes that the second pressure difference is within a first preset voltage range.

[0074] It can be understood that the processing module 101 can convert the first pressure difference between the first connection point B1 and the second connection point B2 into the second pressure difference after collecting the first pressure difference, to determine whether the second pressure difference is within the first preset voltage range, and if so, generate the first warning signal, which is used to represent that the braking circuit has lost the braking function at this time.

[0075] In some other embodiments of the present application, the processing module 101 can turn on each of the four transistors in the H-bridge circuit one by one for testing when the vehicle has not been braked, and determine whether each of the transistors (corresponding to the first H-bridge transistor F2, the second H-bridge transistor F3, the third H-bridge transistor F4 or the fourth H-bridge transistor F5) in the H-bridge circuit is functionally damaged according to the first pressure difference.

[0076] For example, the processing module 101 can also be configured to control the second transistor of the four transistors to be turned on and control the other transistors of the four transistors to be turned off. The first sampling module 104 can also be configured to, in the case that the second transistor is turned on and the other transistors are turned off, collect a third voltage difference between the first connection point B1 and the second connection point B2, determine a fourth voltage difference according to the third voltage difference, and generate a second warning signal when the fourth voltage difference meets a second condition, where the second condition includes that the fourth voltage difference is within a first preset voltage range.

[0077] It can be understood that the second transistor can be a transistor of the four transistors of the H-bridge circuit 102, which is different from the first transistor turned on above, so as to realize the one-by-one testing process of each transistor of the four transistors.

[0078] In some embodiments of the present application, the monitoring device 100 can further include a warning module (not shown in the figure) connected with the MCU, and the processing module 101 can light a warning light in the warning module for indicating brake failure based on the first warning signal (or the second warning signal in the above example), for example, a red light can be turned on to indicate brake failure, so as to realize the warning effect to the user. Thus, the user can monitor the brake failure condition in advance and timely warn the user when the brake function just fails before the brake request is sent.

[0079] In some embodiments of the present application, the warning module can further include other components for warning, for example, can include a display screen, which can be configured to display warning information to the user based on the first warning signal (or the second warning signal in the above example), for example, can be the word “brake failure”, so as to realize the warning effect to the user. For another example, the warning module can include a projector, which can be configured to project and display warning information to the user based on the first warning signal (or the second warning signal in the above example), for example, can be the word “brake failure”, so as to realize the warning effect to the user.

[0080] It can be understood that the warning module includes but is not limited to the warning light, the display screen and the projector, as long as it can warn the user of the brake failure based on the first warning signal. For the sake of brevity, other components included in the warning module are not enumerated one by one.

[0081] In some embodiments of the present application, the first sampling module 104 can include a first sampling unit 1041 and a second sampling unit 1042.

[0082] Figure 4 A circuit structure schematic diagram of a first sampling module 104 according to some embodiments of the present application is shown.

[0083] ReferenceFigure 4 The first connection point B1 of the H-bridge circuit 102 is connected to the post-ground of the first sampling unit 1041, and the second connection point B2 is connected to the post-ground of the second sampling unit 1042.

[0084] Therefore, in the embodiments of the present application, the first sampling module 104 determines the second pressure difference according to the first pressure difference, which can include: the first sampling unit 1041 can be used to divide the first voltage output by the first connection point B1 to obtain the second voltage AN2; the second sampling unit 1042 can be used to divide the third voltage output by the second connection point B2 to obtain the fourth voltage AN3. Further, the first sampling module 104 can determine the difference between the second voltage AN2 and the fourth voltage AN3 as the second pressure difference.

[0085] Thus, through the voltage division processing of the first sampling unit 1041 and the second sampling unit 1042, the first sampling module 104 can convert the output pressure difference between the first connection point B1 and the second connection point B2 (corresponding to the first pressure difference) into the output pressure difference of the second voltage AN2 and the fourth voltage AN3 (corresponding to the second pressure difference).

[0086] It can be understood that the value of the second pressure difference will change with the change of the first pressure difference: the first pressure difference increases, and the second pressure difference increases; the first pressure difference decreases, and the second pressure difference decreases. Therefore, the second pressure difference can effectively reflect the change of the first pressure difference, that is, the second pressure difference can timely reflect the change of the current pressure difference between the first connection point B1 and the second connection point B2, and can effectively monitor whether the current measured transistor (such as the first transistor or the second transistor in the above example) is damaged.

[0087] It can be understood that the structure is simple and accurate for sampling, so as to timely collect the second pressure difference and efficiently realize the warning of brake failure.

[0088] In some embodiments of the present application, the first sampling unit 1041 can include a first resistor R1 and a second resistor R2, and the second sampling unit 1042 can include a third resistor R3 and a fourth resistor R4.

[0089] Figure 5 The circuit structure schematic diagram of the first sampling unit and the second sampling unit according to some embodiments of the present application is shown.

[0090] Reference Figure 5 The first sampling unit 1041 includes a first resistor R1 and a second resistor R2, one end of the first resistor R1 is connected to the first connection point B1, the other end of the first resistor R1 is connected to one end of the second resistor R2, and the other end of the second resistor R2 is grounded to obtain the second voltage AN2 from the connection between the first resistor R1 and the second resistor R2.

[0091] And the second sampling unit 1042 includes a third resistor R3 and a fourth resistor R4, one end of the third resistor R3 is connected with the second connection point B2, the other end of the third resistor R3 is connected with one end of the fourth resistor R4, the other end of the fourth resistor R4 is grounded, so as to obtain a fourth voltage AN3 from the connection of the third resistor R3 and the fourth resistor R4.

[0092] It can be understood that the second voltage AN2 can be determined based on the voltage value of the first voltage output by the first connection point B1, the resistance value of the first resistor R1 and the resistance value of the second resistor R2.

[0093] The fourth voltage AN3 can be determined based on the voltage value of the third voltage output by the second connection point B2, the resistance value of the third resistor R3 and the resistance value of the fourth resistor R4.

[0094] In some embodiments of the present application, the monitoring device 100 further includes a first power supply VCC and a first switch I02.

[0095] Figure 6 The circuit structure schematic diagram of the monitoring device containing the first switch according to some embodiments of the present application is shown.

[0096] Reference Figure 6 The first power supply VCC, the first switch I02 and the first sampling unit 1041 in the first sampling module 104 are connected in sequence. And the processing module 101 can also be used to control the first switch I02 to be periodically turned on and off.

[0097] In some embodiments, the processing module 101 can control the first switch I02 to be turned on with a first preset period, so as to realize the periodic detection of any one of the four transistors in the H-bridge circuit 102 (corresponding to the first transistor or the second transistor in the above example).

[0098] In some embodiments, the first preset period can be 10 milliseconds, 20 milliseconds or 30 milliseconds, which is not limited here.

[0099] In another embodiment, the processing module 101 can control the first switch I02 to be turned off in response to the user's braking request.

[0100] It can be understood that in the case that the user needs to brake the vehicle, if any one of the four transistors in the H-bridge circuit 102 is turned on, it may affect the braking, causing the motor module L to rotate forward or reverse, resulting in braking failure. Therefore, in the case of receiving the user's braking request, the processing module 101 needs to stop monitoring the four transistors in the H-bridge circuit 102, so as to avoid negative impact on the normal braking of the vehicle.

[0101] In some embodiments of the present application, the braking circuit can further include a protection transistor (hereinafter referred to as a third transistor) for preventing the positive and negative poles of the second power supply VBATT from being reversely connected. Damage to the third transistor can also cause the braking to fail.

[0102] The principles of how damage to the third transistor causes the braking to fail will be described in detail below. Figure 7A and Figure 7B The principles of how damage to the third transistor causes the braking to fail will be described in detail below.

[0103] Figure 7A A schematic diagram of the circuit connection of the protection transistor according to some embodiments of the present application is shown.

[0104] Reference is made to Figure 7A The braking circuit can further include the second power supply VBATT and the third transistor F1. The first and third bridge arms of the H-bridge circuit 102 further have a third connection point B3, and the second power supply VBATT, the third transistor F1 and the third connection point B3 are connected in sequence. The MCU can send a voltage signal VCP to the gate of the third transistor F1 through the H-bridge driving chip to control the conduction or turn-off of the third transistor F1.

[0105] It can be understood that the third transistor F1 includes a first body diode, the anode of which is connected to the power supply, and the cathode of which is connected to the third connection point B3. If the positive and negative poles of the second power supply VBATT are reversely connected, the first body diode can cut off the current reversely delivered from the H-bridge circuit 102 to the second power supply VBATT to avoid damage to the second power supply VBATT. Therefore, the third transistor F1 has the function of preventing the second power supply VBATT from being damaged after being reversely connected.

[0106] Figure 7B Another schematic diagram of a scenario of braking failure according to some embodiments of the present application is shown.

[0107] Reference is made to Figure 7B If the third transistor F1 is damaged, the field effect transistor (FET) inside it is usually damaged first, and then the first body diode inside it is damaged.

[0108] However, in the case of damage to the field effect transistor (FET), the second power supply VBATT can still be input to the third connection point B3 through the first body diode to supply power to the H-bridge circuit 102. At this time, the user is difficult to realize that the braking function has been damaged in time. Since the voltage of the second power supply VBATT is relatively large, the first body diode will also be damaged after a period of time. After the first body diode is also damaged, the braking will completely fail, and the user is difficult to drive to a safe area in time, and the driving risk is relatively large.

[0109] Therefore, in some embodiments of the present application, the monitoring device 100 can further include a second sampling module 103, which can be used to monitor whether the third transistor F1 is damaged.

[0110] Figure 8 A connection structure diagram of a monitoring device 100 including a second sampling module 103 is shown according to some embodiments of the present application.

[0111] Reference Figure 8 One end of the second sampling module 103 can be connected with the source of the third transistor F1, and the other end of the second sampling module 103 can be connected with the drain of the third transistor F1, so that it can be used to collect the fifth voltage difference between the source of the third transistor F1 and the drain of the third transistor F1, and obtain the sixth voltage difference AN1 according to the fifth voltage difference, and send the sixth voltage difference AN1 to the processing module 101.

[0112] The processing module 101 can also be used to obtain the sixth voltage difference AN1, and generate a third warning signal when it is determined that the sixth voltage difference AN1 meets a third condition, wherein the third condition includes that the sixth voltage difference AN1 is within a second preset voltage range.

[0113] It can be understood that the sixth voltage difference AN1 within the second preset voltage range can represent that the field effect tube of the third transistor F1 is damaged but the first body diode is still intact, at this time the processing module 101 generates the third warning signal, which can be used to alarm the user that the brake function is about to be damaged.

[0114] Exemplarily, the second preset voltage range can be [200mV, 600mV].

[0115] In other embodiments, the processing module 101 can also be used to generate a fourth warning signal when it is determined that the sixth voltage difference AN1 meets a fourth condition, wherein the fourth condition includes that the sixth voltage difference AN1 is within a third preset voltage range.

[0116] It can be understood that the sixth voltage difference AN1 within the third preset voltage range can represent that the field effect tube of the third transistor F1 and the first body diode are both damaged, at this time the processing module 101 generates the fourth warning signal, which can be used to alarm the user that the brake is invalid.

[0117] Exemplarily, the third preset voltage range can be (600mV, +∞).

[0118] In some embodiments of the present application, the monitoring device 100 can further comprise a warning module (not shown in the figure) connected to the MCU, and the processing module 101 can turn on a warning light in the warning module based on the third warning signal to indicate that the braking is about to fail, for example, a yellow light can be turned on to indicate that the braking is about to fail. This enables the user to be warned before the braking fails, so that the user can drive away from the dangerous driving area in time, or stop the vehicle in time to stop driving, thereby ensuring the safety of the user driving.

[0119] The processing module 101 can also turn on a warning light in the warning module based on the fourth warning signal to indicate that the braking has failed, for example, a red light can be turned on to indicate that the braking has failed. This enables the user to monitor the braking failure in advance and warn the user in time when the braking function just fails before the user makes a braking request.

[0120] In some embodiments of the present application, the warning module can further comprise other components for warning, for example, it can comprise a display screen, which can be used to display corresponding warning information to the user based on the third warning signal, for example, it can display the words "braking is about to fail"; the display screen can also display corresponding warning information to the user based on the fourth warning signal, for example, it can display the words "braking has failed".

[0121] For example, the warning module can comprise a projector, which can be used to project and display corresponding warning information to the user based on the third warning signal, for example, it can project and display the words "braking is about to fail"; the projector can also be used to project and display corresponding warning information to the user based on the fourth warning signal, for example, it can project and display the words "braking has failed", so as to achieve the effect of warning the user.

[0122] It can be understood that the warning module includes but is not limited to warning lights, display screens and projectors, as long as it can warn the user based on the third warning signal or the fourth warning signal. For the sake of brevity, other components included in the warning module are not enumerated one by one.

[0123] In some embodiments of the present application, the monitoring device 100 further comprises a charge pump and a second switch I01.

[0124] Figure 9 A circuit connection structure schematic diagram of a monitoring device 100 comprising a second switch I01 according to some embodiments of the present application is shown.

[0125] Reference Figure 9The charge pump, the second switch I01 and the second sampling module 103 are sequentially connected. The processing module 101 can be configured to control the second switch I01 to be periodically turned on, and when the second switch I01 is turned on, the charge pump can be configured to supply power for the second sampling module 103 when the second switch I01 is turned on, so that the processing module 101 can obtain the sixth voltage difference AN1.

[0126] In the embodiments of the present application, the processing module 101 controls the second switch I01 to be periodically turned on, that is, the third transistor F1 can be periodically detected whether it is damaged. For example, the processing module 101 can periodically detect that the field effect transistor in the above example is damaged but the first body diode is not damaged, or both the field effect transistor and the first body diode are damaged.

[0127] In some embodiments, the processing module 101 can control the second switch I01 to be turned on based on a second preset period.

[0128] For example, the second preset period can be 10 milliseconds, 20 milliseconds or 30 milliseconds, which is not limited herein.

[0129] In some embodiments, the processing module 101 is further configured to control the second switch I01 to be turned off in response to a braking request of a user.

[0130] It can be understood that in the case that the user needs to brake the vehicle, if the second switch I01 is controlled to be turned on so that the second sampling module 103 samples the fifth voltage difference between the source and the drain of the third transistor F1, it may affect the power supply of the second power supply VBATT for the H-bridge circuit 102, and further affect the braking function, causing braking failure. Therefore, in the case that the braking request of the user is received, the processing module 101 turns off the second switch I01 in response to the braking request, so as to timely stop monitoring the third transistor F1, and avoid negative impact on the normal braking of the vehicle.

[0131] In some embodiments of the present application, the second sampling module 103 can include an operational amplifier OP.

[0132] Figure 10 A schematic diagram of a circuit connection mode of an operational amplifier according to some embodiments of the present application is shown.

[0133] Reference Figure 10The second sampling module 103 can convert the fifth differential voltage into a sixth differential voltage AN1 through an operational amplifier OP, and send the sixth differential voltage AN1 to the processing module 101. In this way, the processing module 101 can compare the sixth differential voltage AN1 with the second preset voltage range and the third preset voltage range in the above example, determine whether the third transistor F1 is damaged, and the specific impact on the braking function. In addition, the processing module 101 can also generate a corresponding warning signal according to the damage of the third transistor F1, so as to warn the user, so that the user can take corresponding measures in time, and improve the driving safety of the user.

[0134] Figure 11 A circuit connection structure schematic diagram of another monitoring device 100 according to some embodiments of the present application is shown.

[0135] It can be understood that Figure 11 The monitoring device 100 shown in the example can include all the components shown in the above Figure 6 and Figure 10 The specific embodiments of the monitoring device 100 shown in the example are for the sake of simplicity, Figure 11 The specific embodiments of the monitoring device 100 shown in the example can refer to the specific embodiments of the above Figure 6 and Figure 10 The specific embodiments of the monitoring device 100 shown in the example are for the sake of simplicity,

[0136] Referring to Figure 12 Some embodiments of the present application also propose a vehicle 1200, which can include the monitoring device 100 proposed in any implementation of the above example.

[0137] In the drawings, some structural or method features can be shown in certain arrangements and / or orders. However, it should be understood that such specific arrangements and / or orders can not be required. Instead, these features can be arranged in a different manner and / or order than shown in the illustrative figures, in some embodiments. Additionally, the inclusion of a structural or method feature in a particular figure is not meant to imply that such feature is needed in all embodiments, and in some embodiments, the feature can not be included or can be combined with other features in a combination.

[0138] It should be noted that each unit / module mentioned in each device embodiment of the present application is a logical unit / module, and in physical, one logical unit / module can be a physical unit / module, or a part of a physical unit / module, or be realized in a combination of multiple physical unit / modules, and the physical realization of these logical units / modules is not the most important thing, and the combination of the functions realized by these logical units / modules is the key to solving the technical problems proposed in the present application. In addition, in order to highlight the innovative part of the present application, the above-mentioned device embodiments of the present application do not introduce the units / modules that are not closely related to solving the technical problems proposed in the present application, which does not mean that the above-mentioned device embodiments do not have other units / modules.

[0139] It should be noted that in the examples and description of the present application, the relationship terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. Without more limitations, the element defined by the statement "including one" does not exclude the presence of another identical element in the process, method, article or device including the element.

[0140] The reference in the specification to "some embodiments" or "embodiments" means that the particular feature, structure, or characteristic described in connection with the embodiment is included in at least one example embodiment disclosed in accordance with the present application. The appearance of the phrase "in some embodiments" in various places in the specification does not necessarily all refer to the same embodiment.

[0141] In addition, the language used in the present specification has been chosen primarily for readability and instructional purposes and can not have been selected to delineate or circumscribe the disclosed subject matter. Accordingly, the present application embodiments are intended to be illustrative, not limiting, of the scope of the concepts discussed herein.

Claims

1. A monitoring device for monitoring the braking circuit of a vehicle, characterized in that, The braking circuit includes an H-bridge circuit (102), which includes four transistors. The four transistors are respectively disposed on the four arms of the H-bridge circuit (102). The first and second arms of the four arms have a first connection point (B1), and the third and fourth arms of the four arms have a second connection point (B2). The first connection point (B1) and the second connection point (B2) are used to connect a load. The monitoring device includes a processing module (101) and a first sampling module (104). The processing module (101) is used to control the first transistor of the four transistors to be turned on, and to control the other transistors of the four transistors other than the first transistor to be turned off; The first sampling module (104) is used to collect a first voltage difference between the first connection point (B1) and the second connection point (B2) when the first transistor is turned on and other transistors other than the first transistor are turned off, determine a second voltage difference based on the first voltage difference, and send the second voltage difference to the processing module (101). The processing module (101) is further configured to generate a first warning signal when it is determined that the second pressure difference meets the first condition, wherein the first condition includes the second pressure difference being within a first preset voltage range.

2. The monitoring device according to claim 1, characterized in that, The processing module (101) is also used to control the second transistor of the four transistors to be turned on, and to control the other transistors of the four transistors other than the second transistor to be turned off; The first sampling module (104) is further configured to acquire a third voltage difference between the first connection point (B1) and the second connection point (B2) when the second transistor is turned on and other transistors other than the second transistor are turned off, determine a fourth voltage difference based on the third voltage difference, and generate a second warning signal when the fourth voltage difference meets a second condition, wherein the second condition includes the fourth voltage difference being within the first preset voltage range.

3. The monitoring device according to claim 1, characterized in that, The first sampling module (104) includes a first sampling unit (1041) and a second sampling unit (1042). The first sampling module (104) determines the second pressure difference based on the first pressure difference, including: The first sampling unit (1041) divides the first voltage output from the first connection point (B1) to obtain the second voltage (AN2); The second sampling unit (1042) divides the third voltage output from the second connection point (B2) to obtain the fourth voltage (AN3); The difference between the second voltage (AN2) and the fourth voltage (AN3) is determined as the second voltage difference.

4. The monitoring device according to claim 3, characterized in that, The first sampling unit (1041) includes a first resistor (R1) and a second resistor (R2). One end of the first resistor (R1) is connected to the first connection point (B1), and the other end of the first resistor (R1) is connected to one end of the second resistor (R2). The other end of the second resistor (R2) is grounded. The second sampling unit (1042) includes a third resistor (R3) and a fourth resistor (R4). One end of the third resistor (R3) is connected to the second connection point (B2), and the other end of the third resistor (R3) is connected to one end of the fourth resistor (R4). The other end of the fourth resistor (R4) is grounded.

5. The monitoring device according to claim 1, characterized in that, The monitoring device further includes a first power supply (VCC) and a first switch (I02), which are connected in sequence. The processing module (101) is also used to control the first switch (I02) to periodically turn on and off.

6. The monitoring device according to claim 5, characterized in that, The processing module (101) is also configured to control the first switch (I02) to turn off in response to a user's braking request.

7. The monitoring device according to claim 1, characterized in that, The braking circuit also includes a second power supply (VBATT) and a third transistor (F1). The first and third arms of the H-bridge circuit (102) also have a third connection point (B3). The second power supply (VBATT), the third transistor (F1), and the third connection point (B3) are connected in sequence. The third transistor (F1) includes a first body diode, the anode of which is connected to the power supply, and the cathode of which is connected to the third connection point (B3). The monitoring device also includes a second sampling module (103). The second sampling module (103) is used to collect the fifth voltage difference between the source and the drain of the third transistor (F1), obtain the sixth voltage difference (AN1) based on the fifth voltage difference, and send the sixth voltage difference (AN1) to the processing module (101). The processing module (101) is used to acquire the sixth differential pressure (AN1) and generate a third warning signal when it is determined that the sixth differential pressure (AN1) meets the third condition, wherein the third condition includes the sixth differential pressure (AN1) being within the second preset voltage range.

8. The monitoring device according to claim 7, characterized in that, The monitoring device also includes a charge pump and a second switch (I01), which are sequentially connected to the second sampling module (103). The processing module (101) is also used to control the second switch (I01) to be periodically turned on; The charge pump is used to power the second sampling module (103) when the second switch (I01) is turned on; The processing module (101) for obtaining the sixth pressure difference (AN1) includes: The processing module (101) is further configured to acquire the sixth differential pressure (AN1) when the second switch (I01) is turned on.

9. The monitoring device according to claim 8, characterized in that, The processing module (101) is also configured to control the second switch (I01) to turn off in response to a user's braking request.

10. The monitoring device according to claim 7, characterized in that, The second sampling module (103) includes an operational amplifier (OP). The second sampling module (103) obtains the sixth pressure difference (AN1) based on the fifth pressure difference, including: The fifth differential pressure is amplified into the sixth differential pressure (AN1) by an operational amplifier (OP).

11. A vehicle, characterized in that, The vehicle includes the monitoring device as described in any one of claims 1 to 10.

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