A method and apparatus for monitoring a vehicle powertrain

Abstract

The application provides a kind of monitoring method and device of vehicle power system, by monitoring and diagnosing original driving parameter of power system, the output state of power system is obtained, if power system output state is normal state, the power output parameter of power system is obtained, power output parameter is compared with preset power output parameter threshold, the driving ability of power system is determined, when driving ability is limited, the warning information is output to outside.The original driving parameter and power output parameter of power system are monitored in the application, not only can the driving ability of vehicle power system be monitored in real time, but also can the driving ability of power system be comprehensively detected and warning information be generated under different working conditions, which can remind users to take corresponding measures in advance and enhance driving safety.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric vehicles, in particular to a vehicle power system monitoring method and device. BACKGROUND

[0002] With the establishment of the national double carbon strategy and the increasingly mature technology of electric vehicles, consumers' recognition of electric vehicles is also increasingly high, and the challenges faced by electric vehicles in the field of traffic safety are also increasingly great, especially sudden power interruption or serious power attenuation problems, which can easily cause serious traffic accidents, so the electric vehicle industry needs to continuously improve the vehicle state monitoring means and methods, and timely and accurate diagnosis and early warning of related systems to reduce driving safety risks. In related technologies, the power monitoring of electric vehicles only involves one-sided power judgment, cannot identify the power output under normal applicable working conditions, and cannot achieve comprehensive monitoring of the power system of electric vehicles.

[0003] Comparative document 1 (CN106932208B) provides an output torque monitoring method, device and electric vehicle for an electric vehicle driving system. The method comprises: acquiring the command torque output by the motor controller and the first actual output torque of the motor; acquiring the second actual output torque of the motor according to the command torque and the current speed of the motor; performing torque verification on the command torque according to the first actual output torque and the second actual output torque, respectively, to determine whether the torque verification result meets the preset warning condition; and generating alarm information for prompting the user that the vehicle has a fault risk when the torque verification result meets the preset warning condition. This method only involves power judgment of the torque of the electric vehicle, and cannot monitor the overall power system of the vehicle. When the abnormality of the power battery occurs, this method cannot directly monitor the power system.

[0004] Comparative document 2 (CN108674191B) provides an electric vehicle fault diagnosis method, which adopts a combination of multiple fault levels and multiple processing strategies, acquires the current fault level of the vehicle, and the current fault level includes a first fault level and a second fault level. The first level fault is a fault whose probability of endangering the safety of the vehicle personnel exceeds a predetermined threshold; the second level fault of the fault level is a fault that affects the performance of the vehicle battery or the vehicle and cannot be self-recovered; according to the current fault level, the vehicle is processed according to the corresponding strategy, and the corresponding operation is performed according to the predetermined processing strategy; the fault level of this method is generated according to the feedback signals generated by the multiple sensors or feedback mechanisms arranged in the vehicle; the sensor can only collect part of the signals, and cannot comprehensively monitor the power system of the vehicle.

[0005] Therefore, how to comprehensively and real-time monitor the power system of the electric vehicle is a technical problem to be solved at present. SUMMARY

[0006] In view of the above-mentioned disadvantages of the prior art, the present application provides a monitoring method and device for a vehicle power system to solve the above-mentioned technical problems.

[0007] To achieve the above-mentioned and other related purposes, the technical solutions provided by the present application are as follows.

[0008] A monitoring method for a vehicle power system, comprising:

[0009] performing data monitoring and diagnosis on original driving parameters of the power system to obtain an output state of the power system;

[0010] if the output state is a normal state, obtaining power output parameters of the power system, comparing the power output parameters with preset power output parameter thresholds to determine driving capability of the power system, and outputting warning information when the driving capability is limited.

[0011] In the technical solutions provided by the embodiments of the present application, the step of performing data monitoring and diagnosis on original driving parameters of the power system to obtain an output state of the power system comprises: obtaining the original driving parameters; comparing the original driving parameters with corresponding preset original parameter thresholds to obtain fault information corresponding to the original driving parameters; and determining the output state of the power system according to the fault information.

[0012] In the technical solutions provided by the embodiments of the present application, the original driving parameters include battery voltage, and the step of comparing the original driving parameters with corresponding preset original parameter thresholds to obtain fault information corresponding to the original driving parameters comprises: comparing the battery voltage with a first power supply voltage threshold or a second power supply voltage threshold respectively; when the battery voltage is less than the first power supply voltage threshold and a corresponding duration is greater than a first time threshold, the fault information is a first-level battery under-voltage fault; when the battery voltage is less than the second power supply voltage threshold and a corresponding duration is greater than a second time threshold, the fault information is a second-level battery under-voltage fault; and the second power supply voltage threshold is less than the first power supply voltage threshold.

[0013] In the technical scheme provided in the embodiments of the present application, the original driving parameter includes a power short-circuit time when a high-voltage interlocking loop occurs power short-circuit, a ground short-circuit time when the high-voltage interlocking loop occurs ground short-circuit, and an open-circuit time when the high-voltage interlocking loop occurs open-circuit, the original driving parameter is compared with a corresponding preset original parameter threshold value, and failure information corresponding to the original driving parameter is obtained, including: when the power short-circuit time is greater than a third time threshold value, the failure information is power short-circuit failure; when the ground short-circuit time is greater than a fourth time threshold value, the failure information is ground short-circuit failure; and when the open-circuit time is greater than a fifth time threshold value, the failure information is open-circuit failure.

[0014] In the technical scheme provided in the embodiments of the present application, the original driving parameter includes a transmission time of battery communication information and a transmission time of motor communication information, the original driving parameter is compared with a corresponding preset original parameter threshold value, and failure information corresponding to the original driving parameter is obtained, including: when the transmission time of the battery communication information received by the power system is greater than a sixth time threshold value, the failure information is battery communication failure; and when the transmission time of the motor communication information received by the power system is greater than a seventh time threshold value, the failure information is motor communication failure.

[0015] In the technical scheme provided in the embodiments of the present application, the output state of the power system is determined according to the failure information, including: if the failure information is not monitored, the output state of the power system is a normal state; and if one or more of the failure information is detected, the output state of the power system is an abnormal state.

[0016] In the technical scheme provided in the embodiments of the present application, if the output state of the power system is an abnormal state, the warning information is output.

[0017] The power output parameter of the power system is the maximum discharge power of the power supply battery, the power output parameter is compared with a preset power output parameter threshold value to determine the driving capability of the power system, including: the maximum discharge power is compared with a minimum acceleration power threshold value or a minimum continuous climbing power threshold value respectively; if the maximum discharge power is less than the minimum acceleration power threshold value or the minimum continuous climbing power threshold value, the driving capability of the power system is limited; the minimum acceleration power threshold value is compared with the minimum continuous climbing power threshold value to obtain the preset power output parameter threshold value with the maximum power; the maximum discharge power is compared with the preset power output parameter threshold value with the maximum power; and if the maximum discharge power is greater than or equal to the preset power output parameter threshold value with the maximum power, the driving capability of the power system is normal.

[0018] In the technical scheme provided in the embodiments of the present application, if the output state is a normal state, a power output parameter of the power system is acquired, the power output parameter is a maximum output torque, the power output parameter is compared with a preset power output parameter threshold value to determine the driving capability of the power system, including: the maximum output torque is compared with a minimum acceleration torque threshold value or a minimum continuous climbing torque threshold value respectively; if the maximum output torque is less than the minimum acceleration torque threshold value or the minimum continuous climbing torque threshold value, the driving capability of the power system is limited; the maximum output torque is compared with the preset power output parameter threshold value with the maximum torque; if the maximum output torque is greater than or equal to the preset power output parameter threshold value with the maximum torque, the driving capability of the power system is normal.

[0019] In the technical scheme provided in the embodiments of the present application, a monitoring device of a vehicle power system is provided, the device comprising: a driving output monitoring module, configured to monitor and diagnose original driving parameters of the power system to obtain an output state of the power system; a power output monitoring module, configured to acquire a power output parameter of the power system if the output state is a normal state, compare the power output parameter with a preset power output parameter threshold value to determine the driving capability of the power system; and output warning information when the driving capability is limited.

[0020] The present application provides a monitoring method and device of a vehicle power system, by monitoring and diagnosing original driving parameters of the power system to obtain an output state of the power system, acquiring a power output parameter of the power system if the output state of the power system is a normal state, comparing the power output parameter with a preset power output parameter threshold value to determine the driving capability of the power system, and outputting warning information when the driving capability is limited. The present application can not only monitor the driving capability of the power system of the vehicle in real time, but also comprehensively evaluate the driving capability of the power system under different working conditions and generate warning information, which can remind the user to take corresponding measures in advance and enhance driving safety.

[0021] It should be understood that the foregoing general description and the following detailed description are only exemplary and explanatory, and are not limiting to the present application. BRIEF DESCRIPTION OF DRAWINGS

[0022] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and serve to explain the principles of the present application. It is readily apparent to one of ordinary skill in the art that the accompanying drawings are merely some embodiments of the present application, and other drawings can be obtained from the accompanying drawings without any creative effort. In the drawings:

[0023] Figure 1 is a flow chart of a monitoring method of a vehicle power system according to an exemplary embodiment of the present application;

[0024] Figure 2 is a schematic diagram of a torque limiting coefficient K according to an exemplary embodiment of the present application;

[0025] Figure 3 is a block diagram of a monitoring device of a vehicle power system according to an exemplary embodiment of the present application. DETAILED DESCRIPTION

[0026] Other advantages and effects of the present application can be easily understood by those skilled in the art from the description of the present application. The present application can also be implemented or applied by other different specific embodiments, and the details in the description can be modified or changed based on different views and applications without departing from the spirit of the present application. It should be understood that the preferred embodiments are only for illustrating the present application, but not for limiting the protection scope of the present application.

[0027] It should be noted that the diagrams provided in the following embodiments only schematically illustrate the basic concept of the present application, and only the components related to the present application are shown in the diagrams, but not the number, shape and size of the components when actually implemented. The actual implementation of each component can be randomly changed in shape, number and ratio, and the layout pattern of the components can be more complex.

[0028] In the following description, a large number of details are discussed to provide a more thorough explanation of the embodiments of the present application, however, it is obvious for those skilled in the art that the embodiments of the present application can be implemented without these specific details, and in other embodiments, the well-known structures and devices are shown in the form of block diagrams instead of details, to avoid making the embodiments of the present application difficult to understand.

[0029] The inventor found that in recent years, electric vehicles have occupied a place in the field of automobiles, and consumers' recognition of electric vehicles is also increasing, but electric vehicles also have great challenges in the field of safety, especially the sudden interruption of power system or the serious failure of power, which is particularly prone to cause serious traffic accidents. Therefore, the monitoring of the power system of the electric vehicle is crucial, and timely and accurate diagnosis and early warning of related systems can reduce the risk of driving safety. In related technologies, the monitoring of the power system only involves the monitoring of the power in abnormal conditions, and cannot identify and diagnose the sudden situation of the electric vehicle in the normal use process, and cannot effectively monitor the whole vehicle power of the electric vehicle in real time.

[0030] To solve the above technical problems, the present application provides a monitoring method and device for a vehicle power system, which monitors and diagnoses original driving parameters of the power system to obtain an output state of the power system, acquires power output parameters of the power system when the output state of the power system is normal, compares the power output parameters with preset power output parameter thresholds to determine driving capability of the power system, and outputs warning information when the driving capability is limited.

[0031] Figure 1 FIG. 1 is a flow chart of a monitoring method for a vehicle power system according to an example embodiment of the present application.

[0032] As shown in FIG. 1, in an example embodiment of the present application, the monitoring method for the vehicle power system at least includes the following steps: Figure 1

[0033] S110, monitoring and diagnosing original driving parameters of the power system to obtain an output state of the power system;

[0034] S120, if the output state is normal, acquiring power output parameters of the power system, comparing the power output parameters with preset power output parameter thresholds to determine driving capability of the power system, and outputting warning information when the driving capability is limited.

[0035] In detail, in an example embodiment of the present application, the step of monitoring and diagnosing original driving parameters of the power system to obtain an output state of the power system in step S110 includes: acquiring original driving parameters; comparing the original driving parameters with corresponding preset original parameter thresholds to obtain fault information corresponding to the original driving parameters; and determining the output state of the power system according to the fault information.

[0036] ​More specifically, in an example embodiment of the present application, the original driving parameter includes battery voltage, the comparison between the original driving parameter and the corresponding preset original parameter threshold value obtains the fault information corresponding to the original driving parameter, including: comparing the battery voltage with the first supply voltage threshold value or the second supply voltage threshold value respectively; when the battery voltage is less than the first supply voltage threshold value and the corresponding duration is greater than the first time threshold value, the fault information is a battery under-voltage first-level fault; when the battery voltage is less than the second supply voltage threshold value and the corresponding duration is greater than the second time threshold value, the fault information is a battery under-voltage second-level fault; wherein the second supply voltage threshold value is less than the first supply voltage threshold value. Wherein the battery voltage is the storage battery voltage, the rated voltage of the storage battery voltage is 12V, the storage battery voltage directly drives the vehicle-mounted computer, various sensors and actuators of the vehicle, so it is necessary to monitor the storage battery voltage, the first supply voltage threshold value is set to 12V, the second supply voltage threshold value is set to 10V, the first time threshold value is set to 2 seconds, and the second time threshold value is set to 1 second; comparing the storage battery voltage with the first supply voltage threshold value 12V or the second supply voltage threshold value 10V respectively, when the real-time storage battery voltage is 11V, the real-time storage battery voltage 11V is less than the first supply voltage threshold value 12V and the corresponding duration is 3 seconds, the real-time storage battery voltage 11V is less than the first supply voltage threshold value 12V and the corresponding duration 3 seconds is greater than the first time threshold value 2 seconds, then the fault information is a battery under-voltage first-level fault; if the real-time storage battery voltage 11V is less than the first supply voltage threshold value 12V and the corresponding duration is 1.5 seconds, the battery voltage recovers to 12V after 1.5 seconds, then the battery voltage does not have a fault information. When the real-time storage battery voltage is 9V, the real-time storage battery voltage 9V is less than the second supply voltage threshold value 10V and the corresponding duration is 2 seconds, the real-time storage battery voltage 9V is less than the second supply voltage threshold value 10V and the corresponding duration 2 seconds is greater than the first time threshold value 1 second, then the fault information is a battery under-voltage second-level fault; if the real-time storage battery voltage 9V is less than the second supply voltage threshold value 10V and the corresponding duration is 0.5 seconds, the battery voltage recovers to 12V after 0.5 seconds, then the battery voltage does not have a fault information.

[0037] More specifically, in an example embodiment of the present application, the original driving parameter includes high-voltage interlock loop power supply short circuit time, high-voltage interlock loop ground short circuit time and high-voltage interlock loop open circuit time, the comparison between the original driving parameter and the corresponding preset original parameter threshold value obtains the fault information corresponding to the original driving parameter, including: when the power supply short circuit time is greater than the third time threshold value, the fault information is a power supply short circuit fault; when the ground short circuit time is greater than the fourth time threshold value, the fault information is a ground short circuit fault; when the open circuit time is greater than the fifth time threshold value, the fault information is an open circuit fault.

[0038] It is emphasized that the third time threshold, the fourth time threshold and the fifth time threshold can be the same time or different time, and actual adjustment is made according to the hardware sensitivity of the vehicle; if the third time threshold is set to 0.5 seconds, the fourth time threshold is set to 0.2 seconds, the fifth time threshold is set to 0.3 seconds, the power supply short circuit time of the high-voltage interlocking circuit is 0.4 seconds, the power supply short circuit time is greater than the third time threshold 0.5 seconds, and the fault information is a power supply short circuit fault; the ground short circuit time of the high-voltage interlocking circuit is 0.4 seconds, and the ground short circuit time 0.4 seconds is greater than the fourth time threshold 0.2 seconds, and the fault information is a ground short circuit fault; the open circuit time of the high-voltage interlocking circuit is 0.4 seconds, and the open circuit time 0.4 seconds is greater than the fifth time threshold 0.3 seconds, and the fault information is an open circuit fault.

[0039] More specifically, in an exemplary embodiment of the present application, the original driving parameter includes the transmission time of the battery communication information and the transmission time of the motor communication information, the original driving parameter is compared with the corresponding preset original parameter threshold to obtain the fault information corresponding to the original driving parameter, including: when the transmission time of the battery communication information received by the power system is greater than the sixth time threshold, the fault information is a battery communication fault; when the transmission time of the motor communication information received by the power system is greater than the seventh time threshold, the fault information is a motor communication fault.

[0040] Specifically, if the time required for transmitting a frame of battery communication information is set to 5 milliseconds, the frame period of the battery communication is 5 milliseconds, the sixth time threshold is related to the frame period of the battery communication, and the actual sixth time threshold is set according to the performance setting multiple of the vehicle, for example, the sixth time threshold is 3 times the frame period of the battery communication, the sixth time threshold is 15 milliseconds, and if the transmission time of a frame of battery communication information received by the power system is 18 milliseconds, which is greater than the sixth time threshold 15 milliseconds, the fault information is a battery communication fault. The time required for transmitting a frame of motor communication information is set to 3 milliseconds, the frame period of the motor communication is 3 milliseconds, the seventh time threshold is related to the frame period of the battery communication, and the actual seventh time threshold is set according to the performance setting multiple of the vehicle, for example, the seventh time threshold is set to 4 times the frame period of the battery communication, the seventh time threshold is 12 milliseconds, and if the transmission time of a frame of motor communication information received by the power system is 15 milliseconds, which is greater than the seventh time threshold 12 milliseconds, the fault information is a motor communication fault.

[0041] More specifically, in an exemplary embodiment of the present application, a plurality of battery subsystems are included in the battery module, and the fault of the battery subsystem includes six levels, and if one of the battery subsystems fails, the battery subsystem outputs the fault information of the battery subsystem.

[0042] More specifically, in an example embodiment of the present application, the motor module includes a plurality of motor subsystems, the motor subsystem failure includes three levels, when one of the motor subsystems fails, the motor subsystem outputs the motor subsystem failure information.

[0043] More specifically, in an example embodiment of the present application, the output state of the power system is determined according to the failure information, including: if no failure information is monitored, the output state of the power system is normal; if one or more failure information is detected, the output state of the power system is abnormal. Wherein, if no failure information of the power system is monitored, it indicates that the original power output of the power system is in a normal state, and the original power output of the power system is full; if one or more failure information is detected, it indicates that the output state of the original power output of the power system is abnormal, and the driving ability of the original power output of the power system is limited.

[0044] Specifically, the battery subsystem failure level corresponds to the original power output of the original driving parameter of the power system. If no battery subsystem failure occurs, the original power output of the power system is full; if the battery subsystem failure level is level one, the original power output of the power system is 90% of the maximum driving ability; if the battery subsystem failure level is level two, the original power output of the power system is 70% of the maximum driving ability; if the battery subsystem failure level is level three or level four, the original power output of the power system is 50% of the maximum driving ability; if the battery subsystem failure level is level five or level six, the original power output of the power system is zero.

[0045] Specifically, the motor subsystem failure level corresponds to the original power output of the power system, as follows: if no motor subsystem failure occurs, the original power output of the power system is full output; if the motor subsystem failure level is level one, the original power output of the power system is 90% of the maximum driving ability; if the motor subsystem failure level is level two, the original power output of the power system is 70% of the maximum driving ability; if the motor subsystem failure level is level three, the original power output of the power system is zero.

[0046] More specifically, in an example embodiment of the present application, if the output state of the power system is abnormal, an alarm information is output.

[0047] Specifically, if the output state of the power system is the normal state, it indicates that the original power output of the power system is full, if the detected fault information is one of the battery under-voltage level 1 fault, power supply short circuit fault and ground short circuit fault, battery subsystem level 1 fault and motor subsystem level 1 fault, the original power output of the power system is 90% of the maximum driving capacity and the warning information is output externally; if the detected fault information is one of the battery communication fault, motor communication fault, battery subsystem level 2 fault and motor subsystem level 2 fault, and the data transmitted by the motor and the battery to the power system is normal data, the original power output of the power system is 70% of the maximum driving capacity and the warning information is output externally; if the detected fault information is one of the battery under-voltage level 2 fault, open circuit fault, battery communication fault, motor communication fault, battery subsystem level 3 fault and battery subsystem level 4 fault, and the data transmitted by the motor and the battery to the power system is encrypted data, the original power output of the power system is 50% of the maximum driving capacity and the warning information is output externally; if the detected fault information is one of the open circuit fault, motor subsystem level 3 fault, battery subsystem level 5 fault and battery subsystem level 6 fault, the original power output of the power system is limited to zero and the warning information is output externally; if two or more of the above same maximum driving capacity fault information are detected to occur at the same time, the power system limits the original power output according to the corresponding fault information and outputs the warning information externally; if two or more of the above different maximum driving capacity fault information are detected to occur at the same time, the power system selects the fault information with the lowest maximum driving capacity to limit the original power output of the power system and outputs the warning information externally.

[0048] In detail, in an example embodiment of the present application, in step S120, if the output state is the normal state, the power output parameter of the power system is obtained, the power output parameter is the maximum discharge power of the power supply battery, the power output parameter is compared with the preset power output parameter threshold value to determine the driving capacity of the power system, including: the maximum discharge power is compared with the minimum acceleration power threshold value or the minimum continuous climbing power threshold value respectively; if the maximum discharge power is less than the minimum acceleration power threshold value or the minimum continuous climbing power threshold value, the driving capacity of the power system is limited; the minimum acceleration power threshold value is compared with the minimum continuous climbing power threshold value to obtain the preset power output parameter threshold value with the maximum power; the maximum discharge power is compared with the preset power output parameter threshold value with the maximum power; if the maximum discharge power is greater than or equal to the preset power output parameter threshold value with the maximum power, the driving capacity of the power system is normal.

[0049] For example, if the minimum acceleration power threshold is 40 kW and the minimum continuous climbing power threshold is 50 kW, and the maximum discharge power is 48 kW, which is less than the minimum continuous climbing power threshold 50 kW, the driving capability of the power system is limited. If the minimum acceleration power threshold is 60 kW and the minimum continuous climbing power threshold is 45 kW, and the maximum discharge power is 48 kW, which is less than the minimum acceleration power threshold 60 kW, the driving capability of the power system is limited. If the minimum acceleration power threshold is 40 kW and the minimum continuous climbing power threshold is 50 kW, the minimum acceleration power threshold 40 kW is compared with the minimum continuous climbing power threshold 50 kW, and the minimum continuous climbing power threshold 50 kW is greater than the minimum acceleration power threshold 40 kW. If the maximum discharge power is 51 kW, the maximum discharge power 51 kW is compared with the minimum continuous climbing power threshold 50 kW, and the maximum discharge power 51 kW is greater than the minimum continuous climbing power threshold 50 kW, the driving capability of the power system is normal. If the maximum discharge power is 50 kW, which is equal to the minimum continuous climbing power threshold 50 kW, the driving capability of the power system is normal.

[0050] It should be noted that the minimum acceleration power threshold is obtained by a drum test or simulation calculation: on a wide straight road, a half load of two people is selected, the accelerator is opened to the maximum, and the power of the vehicle accelerating from zero to the first preset speed per unit time is calculated. The minimum continuous climbing power threshold is obtained by a drum test or simulation calculation: the current road slope is selected to be X%, X is greater than zero and less than 100, a half load of two people is selected, and the output power of the vehicle continuously climbing at a second preset speed after normal starting is calculated.

[0051] In detail, in an example embodiment of the present application, in step S120, if the output state is a normal state, the power output parameter of the power system is obtained, the power output parameter is the maximum output torque, and the maximum output torque is compared with the minimum acceleration torque threshold or the minimum continuous climbing torque threshold; if the maximum output torque is less than the minimum acceleration torque threshold or the minimum continuous climbing torque threshold, the driving capability of the power system is limited; the minimum acceleration torque threshold is compared with the minimum continuous climbing torque threshold to obtain the preset power output parameter threshold with the maximum torque; the maximum output torque is compared with the preset power output parameter threshold with the maximum torque; if the maximum output torque is greater than or equal to the preset power output parameter threshold with the maximum torque, the driving capability of the power system is normal.

[0052] If the maximum output torque is 180 N.m, the maximum output torque 180 N.m is less than the minimum continuous climbing torque threshold 200 N.m, the driving capability of the power system is limited. If the minimum acceleration torque threshold is 260 N.m, the minimum continuous climbing torque threshold is 200 N.m, the maximum output torque is 220 N.m, and the maximum output torque 220 N.m is less than the minimum acceleration torque threshold 260 N.m, the driving capability of the power system is limited. If the maximum output torque is 220 N.m, the minimum acceleration torque threshold is 150 N.m, and the minimum continuous climbing torque threshold is 200 N.m, the minimum acceleration torque threshold and the minimum continuous climbing torque threshold are compared, the minimum continuous climbing torque threshold 200 N.m is greater than the minimum acceleration torque threshold 150 N.m, the maximum output torque 220 N.m and the minimum continuous climbing torque threshold 200 N.m are compared, and the maximum output torque 220 N.m is greater than the minimum continuous climbing torque threshold 200 N.m, the driving capability of the power system is normal. If the maximum output torque is 200 N.m, the maximum output torque 200 N.m is equal to the minimum continuous climbing torque threshold 200 N.m, the driving capability of the power system is normal.

[0053] It should be emphasized that the minimum acceleration torque threshold is obtained by a drum test or simulation calculation: on a wide straight road, a half-load load of two people is selected, the throttle is opened to the maximum, and the torque of the vehicle accelerating from zero to the first preset speed per unit time is calculated. Due to the motor external characteristic torque factor, the torque of the motor changes with the vehicle speed, and through real vehicle calibration, the minimum acceleration torque limiting coefficient K1 is obtained first, and the minimum acceleration torque limiting coefficient K1 is a certain value in the range of [0, 1]. Figure 2 is a schematic diagram of the torque limiting coefficient K shown by an exemplary embodiment of the present application; refer to Figure 2 , the minimum acceleration torque limiting coefficient K1 satisfying the above working condition is obtained by a drum test or simulation calculation, so as to obtain the minimum acceleration torque threshold in real time, the minimum acceleration torque threshold = the external characteristic torque corresponding to the current motor speed * the minimum acceleration torque limiting coefficient K1. The minimum continuous climbing torque threshold is obtained by a drum test or simulation calculation: the current road slope is selected as X%, X is greater than zero and less than 100, a half-load load of two people is selected, and the output torque of the vehicle continuously climbing at the second preset speed after normal starting is calculated. Similarly, the minimum continuous climbing torque threshold is also related to the motor external characteristic torque, and the minimum acceleration torque limiting coefficient K2 is obtained through real vehicle calibration, and the minimum acceleration torque limiting coefficient K2 is a certain value in the range of [0, 1]. Refer to Figure 2On the basis of the motor external characteristic torque, the value of the torque limiting coefficient K is adjusted, the lowest acceleration torque limiting coefficient K2 satisfying the above working condition is obtained through the drum test or simulation calculation, and the real-time lowest continuous climbing torque threshold is calculated, the lowest continuous climbing torque threshold = the external characteristic torque corresponding to the current motor speed * the lowest continuous climbing torque limiting coefficient K2.

[0054] In detail, in an example embodiment of the present application, when the driving capability is limited, a warning information is output. When the original output parameter of the power system generates a fault information or the power output parameter of the power system satisfies the condition of the limited driving capability, a warning is given to the user in the form of sound and light signals. The sound signal can be a voice prompt, such as a voice broadcast "vehicle power is limited, please pay attention to driving safety!", or a buzzer prompt sound, etc. The light signal can be an icon information such as a "power limit indicator" lighted or flashing.

[0055] As shown in Figure 3 The monitoring device of the vehicle power system provided in the above embodiment is used for monitoring and diagnosing the original driving parameter of the power system to obtain the output state of the power system, and if the output state is normal, the power output parameter of the power system is obtained, the power output parameter is compared with a preset power output parameter threshold to determine the driving capability of the power system, and when the driving capability is limited, a warning information is output.

[0056] The driving output monitoring module 310 is configured to monitor and diagnose the original driving parameter of the power system to obtain the output state of the power system.

[0057] The power output monitoring module 320 is configured to, if the output state is normal, obtain the power output parameter of the power system, compare the power output parameter with a preset power output parameter threshold to determine the driving capability of the power system, and when the driving capability is limited, output a warning information.

[0058] It should be noted that the monitoring device of the vehicle power system provided in the above embodiment and the monitoring method of the vehicle power system provided in the above embodiment belong to the same concept, and the specific operation of each module and unit has been described in detail in the method embodiment, which will not be repeated here. The monitoring device of the vehicle power system provided in the above embodiment can be used in actual application, and the above functions can be completed by different functional modules according to the needs, that is, the internal structure of the device is divided into different functional modules to complete all or part of the above described functions, and this is not limited here.

[0059] The application provides a kind of monitoring method and device of vehicle power system, by monitoring and diagnosing original driving parameter of power system, obtain the output state of power system and send warning information, can real-time monitoring the original power output of power system, if power system output state is normal state, obtain the power output parameter of power system, compare power output parameter with preset power output parameter threshold, determine the driving ability of power system, when driving ability is limited, output warning information to outside.The application monitors original driving parameter and power output parameter of power system, not only can real-time monitoring the driving ability of vehicle power system, but also can realize comprehensive detection to driving ability of power system under different working conditions and produce warning information, can remind user to collect corresponding measures in advance, enhance driving safety.

[0060] The above embodiments only exemplarily illustrate the principles and effects of the present application, and are not intended to limit the present application. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes made by those skilled in the art without departing from the spirit and technical concept disclosed by the present application should be covered by the claims of the present application.

Claims

1. A method of monitoring a vehicle powertrain system, characterized by, The application relates to a method for monitoring and diagnosing a power system, comprising the following steps: monitoring and diagnosing original driving parameters of the power system to obtain an output state of the power system; if the output state is normal, obtaining a power output parameter of the power system, comparing the power output parameter with a preset power output parameter threshold to determine driving capability of the power system, and outputting a warning information when the driving capability is limited; if the output state is normal, obtaining a power output parameter of the power system, wherein the power output parameter is a maximum discharge power of a power supply battery, comparing the power output parameter with a preset power output parameter threshold to determine driving capability of the power system, and comprising the following steps: comparing the maximum discharge power with a minimum acceleration power threshold or a minimum continuous climbing power threshold; if the maximum discharge power is less than the minimum acceleration power threshold or the minimum continuous climbing power threshold, the driving capability of the power system is limited; comparing the minimum acceleration power threshold with the minimum continuous climbing power threshold to obtain the preset power output parameter threshold with maximum power; comparing the maximum discharge power with the preset power output parameter threshold with maximum power; if the maximum discharge power is greater than or equal to the preset power output parameter threshold with maximum power, the driving capability of the power system is normal; if the output state is normal, obtaining a power output parameter of the power system, wherein the power output parameter is a maximum output torque, comparing the power output parameter with a preset power output parameter threshold to determine driving capability of the power system, and comprising the following steps: comparing the maximum output torque with a minimum acceleration torque threshold or a minimum continuous climbing torque threshold; if the maximum output torque is less than the minimum acceleration torque threshold or the minimum continuous climbing torque threshold, the driving capability of the power system is limited; comparing the minimum acceleration torque threshold with the minimum continuous climbing torque threshold to obtain the preset power output parameter threshold with maximum torque; comparing the maximum output torque with the preset power output parameter threshold with maximum torque; if the maximum output torque is greater than or equal to the preset power output parameter threshold with maximum torque, the driving capability of the power system is normal.

2. The monitoring method of a vehicle powertrain according to claim 1, characterized by, The step of monitoring and diagnosing original driving parameters of the power system to obtain an output state of the power system comprises the following steps: obtaining the original driving parameters; comparing the original driving parameters with corresponding preset original parameter thresholds to obtain fault information corresponding to the original driving parameters; determining the output state of the power system according to the fault information.

3. The monitoring method of a vehicle powertrain according to claim 2, characterized by, The original driving parameters comprise a battery voltage, and the step of comparing the original driving parameters with corresponding preset original parameter thresholds to obtain fault information corresponding to the original driving parameters comprises the following steps: comparing the battery voltage with a first power supply voltage threshold or a second power supply voltage threshold; When the battery voltage is less than the first power supply voltage threshold and the corresponding duration is greater than a first time threshold, the fault information is a first-level battery undervoltage fault; When the battery voltage is less than the second power supply voltage threshold and the corresponding duration is greater than a second time threshold, the fault information is a second-level battery undervoltage fault; The second power supply voltage threshold is less than the first power supply voltage threshold.

4. The method of claim 3, wherein The original driving parameters include a power supply short-circuit time when a high-voltage interlocking loop occurs a power supply short circuit, a ground short-circuit time when the high-voltage interlocking loop occurs a ground short circuit, and an open-circuit time when the high-voltage interlocking loop occurs an open circuit. The original driving parameters are compared with corresponding preset original parameter thresholds to obtain fault information corresponding to the original driving parameters, including: When the power supply short-circuit time is greater than a third time threshold, the fault information is a power supply short-circuit fault; When the ground short-circuit time is greater than a fourth time threshold, the fault information is a ground short-circuit fault; When the open-circuit time is greater than a fifth time threshold, the fault information is an open-circuit fault.

5. The method of claim 4, wherein The original driving parameters include a transmission time of battery communication information and a transmission time of motor communication information. The original driving parameters are compared with corresponding preset original parameter thresholds to obtain fault information corresponding to the original driving parameters, including: When the transmission time of the battery communication information received by the power system is greater than a sixth time threshold, the fault information is a battery communication fault; When the transmission time of the motor communication information received by the power system is greater than a seventh time threshold, the fault information is a motor communication fault.

6. The method of claim 5, wherein The output state of the power system is determined according to the fault information, including: If the fault information is not monitored, the output state of the power system is a normal state; If one or more of the fault information is detected, the output state of the power system is an abnormal state.

7. The method of claim 6, wherein If the output state of the power system is an abnormal state, the warning information is output.

8. A monitoring device for a vehicle powertrain system, characterized by The device includes: A driving output monitoring module for data monitoring and diagnosis of original driving parameters of the power system to obtain an output state of the power system; A power output monitoring module for obtaining power output parameters of the power system if the output state is a normal state, comparing the power output parameters with preset power output parameter thresholds to determine a driving capability of the power system, and outputting warning information when the driving capability is limited; If the output state is a normal state, the power output parameters of the power system are obtained, the power output parameters are maximum discharge power of a power supply battery, the power output parameters are compared with preset power output parameter thresholds to determine the driving capability of the power system, including: The maximum discharge power is compared with a minimum acceleration power threshold or a minimum continuous climbing power threshold, respectively; If the maximum discharge power is less than the minimum acceleration power threshold or the minimum continuous climbing power threshold, the driving capability of the power system is limited. comparing the minimum acceleration power threshold with the minimum continuous ramping power threshold to obtain the preset power output parameter threshold with maximum power; comparing the maximum discharge power with the preset power output parameter threshold with maximum power; if the maximum discharge power is greater than or equal to the preset power output parameter threshold with maximum power, the driving capability of the power system is normal; if the output state is the normal state, obtaining a power output parameter of the power system, the power output parameter being maximum output torque, comparing the power output parameter with a preset power output parameter threshold to determine the driving capability of the power system, comprising: comparing the maximum output torque with a minimum acceleration torque threshold or a minimum continuous ramping torque threshold respectively; if the maximum output torque is less than the minimum acceleration torque threshold or the minimum continuous ramping torque threshold, the driving capability of the power system is limited; comparing the minimum acceleration torque threshold with the minimum continuous ramping torque threshold to obtain the preset power output parameter threshold with maximum torque; comparing the maximum output torque with the preset power output parameter threshold with maximum torque; if the maximum output torque is greater than or equal to the preset power output parameter threshold with maximum torque, the driving capability of the power system is normal.

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