CN110696619A - Insulation monitoring method and device for hybrid electric vehicle and hybrid electric vehicle - Google Patents
Insulation monitoring method and device for hybrid electric vehicle and hybrid electric vehicle Download PDFInfo
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- CN110696619A CN110696619A CN201810747059.5A CN201810747059A CN110696619A CN 110696619 A CN110696619 A CN 110696619A CN 201810747059 A CN201810747059 A CN 201810747059A CN 110696619 A CN110696619 A CN 110696619A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
- B60L3/0046—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to electric energy storage systems, e.g. batteries or capacitors
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Abstract
The invention discloses an insulation monitoring method and device for a hybrid electric vehicle and the hybrid electric vehicle. The method comprises the following steps: acquiring the running state of the hybrid electric vehicle; and determining a monitoring point for communicating the first switch and the second switch according to the running state, and carrying out insulation monitoring on the inside or the outside of the power battery. The invention solves the technical problem that the insulation monitoring method of the hybrid electric vehicle provided by the related technology can not give consideration to the flexible insulation fault monitoring of the hybrid electric vehicle in different operation modes.
Description
Technical Field
The invention relates to the field of electric automobiles, in particular to an insulation monitoring method and device for a hybrid electric vehicle and the hybrid electric vehicle.
Background
FIG. 1 is a schematic circuit diagram illustrating a hybrid vehicle insulation monitoring method according to the related art, in which a Battery Management System (BMS) controls K after a vehicle is powered ON as shown in FIG. 11And K2Alternately closing, and calculating the equivalent insulation resistance R of the anode loop in the power battery to the vehicle body by an end voltage methodPAnd equivalent insulation resistance R of negative pole loop in power battery to vehicle bodyN. If the fact that the inside of the power battery has an insulation fault is monitored, the BMS reports the fault to the whole vehicle, and the vehicle is forbidden to be charged with high voltage. If it is detected that no insulation fault exists in the power battery, the power battery executes high voltage operation after receiving high voltage operation of a driverAnd (4) pressing to close the positive contactor and the negative contactor, and operating the insulation monitoring module. At this time, RPThe reaction is the insulation resistance of the anode loop of the whole vehicle to the vehicle body, RNThe reaction is the insulation resistance of the anode loop of the whole vehicle to the vehicle body.
When the vehicle is in a pure electric running mode or a hybrid driving mode, the insulation monitoring module of the main contactor of the power battery can monitor the insulation resistance of a high-voltage loop of the whole vehicle in real time.
Under specific working conditions, such as low temperature of the power battery or failure of other battery systems, the positive and negative contactors in the power battery cannot be closed, at the moment, the engine drives the driving motor to generate electricity, and the electricity is converted into high-voltage direct current through the motor controller to supply power to the high-voltage system. The high-voltage direct current-low-voltage direct current converter (DC-DC) converts high-voltage direct current into low-voltage direct current to supply power for a low-voltage load of the whole vehicle.
In the mode, the insulation resistance value tested by the insulation monitoring module can only reflect the insulation state in the power battery, and the external high-voltage loop of the whole vehicle is in an unmonitored state. If the external high-voltage loop has an insulation fault, the fault cannot be found and reported in time.
If the insulation monitoring module is arranged ON the outer side of the power battery contactor and close to the end of the external high-voltage loop, when the vehicle is powered ON, the internal loop of the battery is in an unmonitored state. If there is an insulation fault in the high-voltage circuit inside the battery, the fault cannot be found and reported in time, and the fault can be found only after the high voltage is reached and then the high voltage is reached, so that the operation mode has a greater safety risk.
In view of the above problems, no effective solution has been proposed.
Disclosure of Invention
At least some embodiments of the present invention provide an insulation monitoring method and apparatus for a hybrid electric vehicle, and a hybrid electric vehicle, so as to at least solve the technical problem that the insulation monitoring method for a hybrid electric vehicle provided in the related art cannot give consideration to the flexible insulation fault monitoring of the hybrid electric vehicle in different operation modes.
According to one embodiment of the present invention, there is provided an insulation monitoring method of a hybrid electric vehicle including: a power battery; the power battery includes: the monitoring device comprises a positive contactor, a negative contactor, a first switch and a second switch, wherein a first monitoring point is arranged at the first end of the positive contactor, a second monitoring point is arranged at the second end of the positive contactor, a third monitoring point is arranged at the first end of the negative contactor, and a fourth monitoring point is arranged at the first end of the negative contactor; the method comprises the following steps:
acquiring the running state of the hybrid electric vehicle; and determining a monitoring point for communicating the first switch and the second switch according to the running state, and carrying out insulation monitoring on the inside or the outside of the power battery.
Optionally, determining a monitoring point at which the first switch and the second switch are communicated according to the operation state, and performing insulation monitoring on the inside or the outside of the power battery comprises: determining that the positive contactor and the negative contactor are both in a closed state according to the running state; alternately controlling the first switch to be communicated with the second monitoring point and the second switch to be communicated with the fourth monitoring point to perform insulation monitoring on the interior of the power battery, wherein when the insulation value of equivalent insulation resistance in the interior of the power battery is larger than a first preset threshold value, the high-voltage system in the hybrid electric vehicle is determined to normally work, when the insulation value is larger than a second preset threshold value and smaller than the first preset threshold value, a diagnosis fault code is recorded, when the insulation value is larger than a third preset threshold value and smaller than the second preset threshold value, the diagnosis fault code is recorded, an instrument fault lamp is lightened, the hybrid electric vehicle is controlled to enter a power-limited driving state, when the insulation value is smaller than the third preset threshold value, the diagnosis fault code is recorded, the instrument fault lamp is lightened, and the power supply of the hybrid electric vehicle is cut off or the power of the hybrid electric vehicle is reduced according to the current speed of the hybrid electric vehicle.
Optionally, determining a monitoring point at which the first switch and the second switch are communicated according to the operation state, and performing insulation monitoring on the inside or the outside of the power battery comprises: determining that the positive contactor and the negative contactor are not in a closed state according to the running state; alternately controlling the first switch to be communicated with the first monitoring point and the second switch to be communicated with the third monitoring point to perform insulation monitoring on the outside of the power battery, wherein when the insulation value of equivalent insulation resistance in the power battery is larger than a first preset threshold value, the high-voltage system in the hybrid electric vehicle is determined to normally work, when the insulation value is larger than a second preset threshold value and smaller than the first preset threshold value, a diagnosis fault code is recorded, when the insulation value is larger than the third preset threshold value and smaller than the second preset threshold value, the diagnosis fault code is recorded, an instrument fault lamp is lightened, the hybrid electric vehicle is controlled to enter a power-limiting driving state, when the insulation value is smaller than the third preset threshold value, the diagnosis fault code is recorded, the instrument fault lamp is lightened, and the power supply of the hybrid electric vehicle is cut off or the power of the hybrid electric vehicle is reduced according to the current speed of the hybrid electric vehicle.
Optionally, determining a monitoring point at which the first switch and the second switch are communicated according to the operation state, and performing insulation monitoring on the inside or the outside of the power battery comprises: determining that the positive contactor and the negative contactor are not in a closed state, a driving motor in the hybrid electric vehicle is in a non-power generation state, and the hybrid electric vehicle is in a power-on state according to the running state; alternately controlling the first switch to be communicated with the second monitoring point and the second switch to be communicated with the fourth monitoring point to perform insulation monitoring on the inside of the power battery, wherein when the insulation value of equivalent insulation resistance inside the power battery is larger than a first preset threshold value, the high-voltage system in the hybrid electric vehicle is determined to normally work, when the insulation value is larger than a second preset threshold value and smaller than the first preset threshold value, a diagnosis fault code is recorded, when the insulation value is larger than a third preset threshold value and smaller than the second preset threshold value, the diagnosis fault code is recorded, an instrument fault lamp is lightened, the hybrid electric vehicle is controlled to enter a power-limiting driving state, and when the insulation value is smaller than the third preset threshold value, the diagnosis fault code is recorded, the instrument fault lamp is lightened, and the high-voltage component in the hybrid electric vehicle is controlled to stop working.
Optionally, determining a monitoring point at which the first switch and the second switch are communicated according to the operation state, and performing insulation monitoring on the inside or the outside of the power battery comprises: determining that the positive contactor and the negative contactor are not in a closed state according to the running state, an engine in the hybrid electric vehicle drives a driving motor to be in a power generation state, and the hybrid electric vehicle is not in a power-on state; and determining that the hybrid electric vehicle is not in a working state, stopping performing insulation monitoring on the inside or the outside of the power battery, and entering a sleep mode.
According to an embodiment of the present invention, there is also provided an insulation monitoring device for a hybrid electric vehicle, including: a hybrid electric vehicle includes: a power battery; the power battery includes: the monitoring device comprises a positive contactor, a negative contactor, a first switch and a second switch, wherein a first monitoring point is arranged at the first end of the positive contactor, a second monitoring point is arranged at the second end of the positive contactor, a third monitoring point is arranged at the first end of the negative contactor, and a fourth monitoring point is arranged at the first end of the negative contactor; the device includes:
the acquisition module is used for acquiring the running state of the hybrid electric vehicle; and the monitoring module is used for determining a monitoring point for communicating the first switch and the second switch according to the running state and carrying out insulation monitoring on the inside or the outside of the power battery.
Optionally, the monitoring module comprises: the first determining unit is used for determining that the positive contactor and the negative contactor are both in a closed state according to the running state; the first monitoring unit is used for alternately controlling the first switch to be communicated with the second monitoring point and the second switch to be communicated with the fourth monitoring point so as to carry out insulation monitoring on the interior of the power battery, wherein when the insulation value of the equivalent insulation resistance in the power battery is larger than a first preset threshold value, the high-voltage system in the hybrid electric vehicle is determined to work normally, when the insulation value is larger than a second preset threshold value and smaller than a first preset threshold value, recording a diagnosis fault code, when the insulation value is larger than a third preset threshold value and smaller than a second preset threshold value, recording a diagnosis fault code, lightening an instrument fault lamp, controlling the hybrid electric vehicle to enter a power-limited driving state, when the insulation value is less than a third preset threshold value, recording a diagnosis fault code, lighting a fault lamp of the instrument, and cutting off the power supply of the hybrid electric vehicle or reducing the power of the hybrid electric vehicle according to the current vehicle speed of the hybrid electric vehicle.
Optionally, the monitoring module comprises: the second determining unit is used for determining that the positive contactor and the negative contactor are not in a closed state according to the running state; the second monitoring unit is used for alternately controlling the first switch to be communicated with the first monitoring point and the second switch to be communicated with the third monitoring point so as to carry out insulation monitoring on the outside of the power battery, wherein when the insulation value of the equivalent insulation resistance in the power battery is larger than a first preset threshold value, the high-voltage system in the hybrid electric vehicle is determined to work normally, when the insulation value is larger than a second preset threshold value and smaller than a first preset threshold value, recording a diagnosis fault code, when the insulation value is larger than a third preset threshold value and smaller than a second preset threshold value, recording a diagnosis fault code, lightening an instrument fault lamp, controlling the hybrid electric vehicle to enter a power-limited driving state, when the insulation value is less than a third preset threshold value, recording a diagnosis fault code, lighting a fault lamp of the instrument, and cutting off the power supply of the hybrid electric vehicle or reducing the power of the hybrid electric vehicle according to the current vehicle speed of the hybrid electric vehicle.
Optionally, the monitoring module comprises: the third determining unit is used for determining that the positive contactor and the negative contactor are both in an unclosed state, the driving motor in the hybrid electric vehicle is in a non-power-generating state and the hybrid electric vehicle is in a power-on state according to the running state; and the third monitoring unit is used for alternately controlling the first switch to be communicated with the second monitoring point and the second switch to be communicated with the fourth monitoring point to perform insulation monitoring on the inside of the power battery, wherein when the insulation value of equivalent insulation resistance in the power battery is greater than a first preset threshold value, the high-voltage system in the hybrid electric vehicle is determined to normally work, when the insulation value is greater than a second preset threshold value and less than the first preset threshold value, a diagnosis fault code is recorded, when the insulation value is greater than a third preset threshold value and less than the second preset threshold value, the diagnosis fault code is recorded, an instrument fault lamp is lightened, the hybrid electric vehicle is controlled to enter a power-limiting driving state, and when the insulation value is less than the third preset threshold value, the diagnosis fault code is recorded, the instrument fault lamp is lightened, and the high-voltage component in the hybrid electric vehicle is controlled to stop working.
Optionally, the monitoring module comprises: the fourth determining unit is used for determining that the positive contactor and the negative contactor are not in a closed state, an engine in the hybrid electric vehicle drives the driving motor to be in a power generation state, and the hybrid electric vehicle is not in a power-on state according to the running state; and the fourth monitoring unit is used for determining that the hybrid electric vehicle is not in a working state, stopping performing insulation monitoring on the inside or the outside of the power battery and entering a sleep mode.
According to an embodiment of the present invention, there is also provided a hybrid electric vehicle including: a power battery and the insulation monitoring device; the power battery includes: the first end of positive contactor is provided with first monitoring point, and the second end of positive contactor is provided with the second monitoring point, and the first end of negative contactor is provided with the third monitoring point, and the first end of negative contactor is provided with the fourth monitoring point.
In at least some embodiments of the invention, a mode of acquiring the running state of the hybrid electric vehicle is adopted, monitoring points where the first switch and the second switch are communicated are determined according to the running state, and the inside or the outside of the power battery is subjected to insulation monitoring, so that the purpose of switching among a plurality of insulation monitoring points according to the running states of the vehicle in different running modes is achieved, thereby realizing the technical effect of insulation monitoring under various working conditions of the electric vehicle, and further solving the technical problem that the insulation monitoring method of the hybrid electric vehicle provided in the related technology cannot give consideration to the flexible insulation fault monitoring of the hybrid electric vehicle in different running modes.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
fig. 1 is a schematic circuit configuration diagram of a hybrid vehicle insulation monitoring method according to the related art;
FIG. 2 is a schematic circuit diagram of a hybrid vehicle insulation monitoring method according to an embodiment of the invention;
fig. 3 is a flowchart of an insulation monitoring method of a hybrid electric vehicle according to one embodiment of the invention;
fig. 4 is a schematic view of an insulation monitoring process of the hybrid electric vehicle according to one preferred embodiment of the present invention;
fig. 5 is a block diagram of the structure of an insulation monitoring apparatus of a hybrid electric vehicle according to one embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
According to an embodiment of the present invention, there is provided an embodiment of an insulation monitoring method for a hybrid electric vehicle, where it is noted that the steps illustrated in the flowchart of the drawings may be executed in a computer system such as a set of computer executable instructions, and that although a logical order is illustrated in the flowchart, in some cases, the steps illustrated or described may be executed in an order different from that herein.
The method embodiment provided by this embodiment may be performed in a hybrid electric vehicle. Fig. 2 is a schematic circuit configuration diagram of an insulation monitoring method for a hybrid electric vehicle according to an embodiment of the present invention, and as shown in fig. 2, unlike the circuit configuration shown in fig. 1, a power battery inside the hybrid electric vehicle includes: anodal contactor, negative pole contactor, K1 (be first switch) and K2 (be the second switch), anodal contactor's first end is provided with insulating monitoring point a (be first monitoring point promptly), anodal contactor's second end is provided with insulating monitoring point b (be the second monitoring point promptly), negative pole contactor's first end is provided with insulating monitoring point c (be the third monitoring point promptly), negative pole contactor's first end is provided with insulating monitoring point d (be the fourth monitoring point promptly), therefore, the monitoring point according to the running state adjustment insulation monitoring circuit of vehicle, the insulation of real-time supervision main contactor inside and outside, ensure vehicle high-voltage safety.
Further, in addition to the circuit configuration shown in fig. 2, the hybrid electric vehicle may further include, inside thereof: one or more processors (which may include, but are not limited to, a processing device such as a microprocessor MCU or a programmable logic device FPGA), a memory for storing data, and a transmission module for communication functions. Besides, the method can also comprise the following steps: an in-vehicle display, an input/output interface (I/O interface), a Universal Serial Bus (USB) port (which may be included as one of the ports of the I/O interface), a network interface, and/or a power supply.
It should be noted that the one or more processors and/or other data processing circuitry described above may be referred to generally herein as "data processing circuitry". The data processing circuitry may be embodied in whole or in part in software, hardware, firmware, or any combination thereof. Further, the data processing circuit may be a single, stand-alone processing module, or incorporated, in whole or in part, into any of the other components in the hybrid electric vehicle. As referred to in the embodiments of the application, the data processing circuit acts as a processor control (e.g. selection of a variable resistance termination path connected to the interface).
The memory may be configured to store software programs and modules of application software, such as program instructions/data storage devices corresponding to the hybrid vehicle insulation monitoring method in the embodiment of the present invention, and the processor executes various functional applications and data processing by operating the software programs and modules stored in the memory, so as to implement the hybrid vehicle insulation monitoring method. The memory may include high speed random access memory, and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory may further include memory remotely located from the processor, and these remote memories may be connected to the hybrid electric vehicle through a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
Under the above-described operating environment, the present invention provides an insulation monitoring method for a hybrid electric vehicle as shown in fig. 3.
Fig. 3 is a flowchart of an insulation monitoring method of a hybrid electric vehicle according to an embodiment of the present invention, as shown in fig. 3, the method including the steps of:
step S12, acquiring the running state of the hybrid electric vehicle;
and step S14, determining a monitoring point where the first switch and the second switch are communicated according to the running state, and carrying out insulation monitoring on the inside or the outside of the power battery.
Through the steps, the mode of obtaining the running state of the hybrid electric vehicle can be adopted, the monitoring points communicated with the first switch and the second switch are determined according to the running state, the inside or the outside of the power battery is subjected to insulation monitoring, the aim of switching among a plurality of insulation monitoring points according to the running state of the vehicle in different running modes is fulfilled, the technical effect of insulation monitoring under various working conditions of the electric vehicle is achieved, and the technical problem that the insulation monitoring method of the hybrid electric vehicle provided in the related technology cannot give consideration to the fact that the hybrid electric vehicle flexibly performs insulation fault monitoring under different running modes is solved.
The operation state of the hybrid electric vehicle can be determined according to the current working condition of the hybrid electric vehicle. For example: the hybrid electric vehicle runs under the conventional working condition of a pure electric running mode or a hybrid driving mode, and runs under the specific working condition that the positive and negative contactors in the power battery cannot be closed due to low temperature of the power battery or other battery system faults.
Alternatively, in step S14, determining a monitoring point at which the first switch and the second switch are communicated according to the operation state, and performing insulation monitoring on the inside or the outside of the power battery may include performing the steps of:
step S141, determining that the positive contactor and the negative contactor are both in a closed state according to the running state;
step S142, alternately controlling the first switch to be communicated with the second monitoring point and the second switch to be communicated with the fourth monitoring point, carrying out insulation monitoring on the interior of the power battery, wherein when the insulation value of the equivalent insulation resistance in the power battery is larger than a first preset threshold value, the high-voltage system in the hybrid electric vehicle is determined to work normally, when the insulation value is larger than a second preset threshold value and smaller than a first preset threshold value, recording a diagnosis fault code, when the insulation value is larger than a third preset threshold value and smaller than a second preset threshold value, recording a diagnosis fault code, lightening an instrument fault lamp, controlling the hybrid electric vehicle to enter a power-limited driving state, when the insulation value is less than a third preset threshold value, recording a diagnosis fault code, lighting a fault lamp of the instrument, and cutting off the power supply of the hybrid electric vehicle or reducing the power of the hybrid electric vehicle according to the current vehicle speed of the hybrid electric vehicle.
Fig. 4 is a schematic diagram of an insulation monitoring process of a hybrid electric vehicle according to a preferred embodiment of the present invention, and as shown in fig. 4, after the insulation monitoring function is activated, it is determined whether a main contactor of a power battery is in a closed state according to a vehicle operating condition. If the main contactor is in the closed state, then K1 and K2 are alternately closed between monitoring points b and d. And then, monitoring the insulation state in the power battery in real time based on a terminal voltage method. When the insulation value is larger than X omega/V (X is larger than 500, which is equivalent to the first preset threshold), the high-voltage system has no insulation fault; when the insulation value is between X omega/V and 500 omega/V (equivalent to the second preset threshold), the vehicle records a diagnosis fault code (DTC); when the insulation value is 500 omega/V-Y omega/V (100< Y <500, which is equivalent to the third preset threshold), the vehicle records a DTC, lights an instrument fault lamp and drives with limited power; when the insulation value is lower than Y omega/V, the vehicle records a fault code DTC and lights an instrument fault lamp, when the vehicle speed is less than 5km/h, the vehicle is directly powered off, and when the vehicle speed is more than 5km/h, the vehicle power is reduced to zero.
Alternatively, in step S14, determining a monitoring point at which the first switch and the second switch are communicated according to the operation state, and performing insulation monitoring on the inside or the outside of the power battery may include performing the steps of:
step S143, determining that the anode contactor and the cathode contactor are not in a closed state according to the running state;
step S144, alternately controlling the first switch to be communicated with the first monitoring point and the second switch to be communicated with the third monitoring point, carrying out insulation monitoring on the outside of the power battery, wherein when the insulation value of the equivalent insulation resistance in the power battery is larger than a first preset threshold value, the high-voltage system in the hybrid electric vehicle is determined to work normally, when the insulation value is larger than a second preset threshold value and smaller than a first preset threshold value, recording a diagnosis fault code, when the insulation value is larger than a third preset threshold value and smaller than a second preset threshold value, recording a diagnosis fault code, lightening an instrument fault lamp, controlling the hybrid electric vehicle to enter a power-limited driving state, when the insulation value is less than a third preset threshold value, recording a diagnosis fault code, lighting a fault lamp of the instrument, and cutting off the power supply of the hybrid electric vehicle or reducing the power of the hybrid electric vehicle according to the current vehicle speed of the hybrid electric vehicle.
Still as shown in fig. 4, if it is determined that the main contactor in the power battery is not closed according to the vehicle operating condition, and the engine drives the driving motor to generate power to supply power to the high-voltage system of the entire vehicle, then K1 and K2 are alternately closed between monitoring points a and c. And then monitoring the insulation state of the load end of the high-voltage system in real time based on an end voltage method. When the insulation value is larger than X omega/V, the high-voltage system has no insulation fault; when the insulation value is between X omega/V and 500 omega/V, the vehicle records a diagnosis fault code (DTC); when the insulation value is 500 omega/V-Y omega/V, the vehicle records DTC, lights the fault lamp of the instrument and drives with limited power; when the insulation value is lower than Y omega/V, the vehicle records a fault code DTC and lights an instrument fault lamp, when the vehicle speed is less than 5km/h, the vehicle is directly powered off, and when the vehicle speed is more than 5km/h, the vehicle power is reduced to zero.
Alternatively, in step S14, determining a monitoring point at which the first switch and the second switch are communicated according to the operation state, and performing insulation monitoring on the inside or the outside of the power battery may include performing the steps of:
step S145, determining that the positive contactor and the negative contactor are not closed, the driving motor in the hybrid electric vehicle is not in a power generation state, and the hybrid electric vehicle is in a power-on state according to the running state;
and step S146, alternately controlling the first switch to be communicated with the second monitoring point and the second switch to be communicated with the fourth monitoring point, and carrying out insulation monitoring on the interior of the power battery, wherein when the insulation value of equivalent insulation resistance in the interior of the power battery is greater than a first preset threshold value, the high-voltage system in the hybrid electric vehicle is determined to normally work, when the insulation value is greater than a second preset threshold value and less than the first preset threshold value, a diagnosis fault code is recorded, when the insulation value is greater than a third preset threshold value and less than the second preset threshold value, the diagnosis fault code is recorded, an instrument fault lamp is lightened, the hybrid electric vehicle is controlled to enter a power-limiting driving state, and when the insulation value is less than the third preset threshold value, the diagnosis fault code is recorded, the instrument fault lamp is lightened, and a high-voltage component in the hybrid electric vehicle is controlled to stop working.
Still as shown in fig. 4, if it is determined that the main contactor in the power battery is not in the closed state according to the vehicle operation condition and the driving motor is not generating power, the load end of the high-voltage system of the entire vehicle is in a non-high-voltage state at this time. If the vehicle is in the ON electrical state, then K1 and K2 of the insulation monitoring system are alternately closed between monitoring points b and d at this time. And then monitoring the insulation state in the power battery in real time based on a terminal voltage method. When the insulation value is larger than X omega/V, the high-voltage system has no insulation fault; when the insulation value is between X omega/V and 500 omega/V, recording a fault code DTC by the vehicle; when the insulation value is 500 omega/V-Y omega/V, the vehicle records a fault code DTC and lights an instrument fault lamp, the vehicle can respond to the power-on demand of a driver, but the available power of the vehicle is limited; when the insulation value is lower than Y omega/V, the vehicle records a fault code DTC, an instrument fault lamp is lightened, a vehicle high-voltage system is limited, and all high-voltage components do not work.
Alternatively, in step S14, determining a monitoring point at which the first switch and the second switch are communicated according to the operation state, and performing insulation monitoring on the inside or the outside of the power battery may include performing the steps of:
step S147, determining that the positive contactor and the negative contactor are not closed according to the running state, the engine in the hybrid electric vehicle drives the driving motor to be in a power generation state, and the hybrid electric vehicle is not in a power-on state;
and step S148, determining that the hybrid electric vehicle is not in the working state, stopping insulation monitoring on the inside or outside of the power battery and entering a sleep mode.
Still as shown in fig. 4, if it is determined that the main contactor in the power battery is not in a closed state according to the vehicle operation condition, the engine drives the driving motor to generate power and is not in an ON power state, the vehicle is in a non-operating state at this time, and the insulation monitoring system is in a sleep state.
There is also provided, in accordance with an embodiment of the present invention, an embodiment of an insulation monitoring device for a hybrid electric vehicle, the hybrid electric vehicle including: a power battery; the power battery includes: the first end of positive contactor is provided with first monitoring point, and the second end of positive contactor is provided with the second monitoring point, and the first end of negative contactor is provided with the third monitoring point, and the first end of negative contactor is provided with the fourth monitoring point. Fig. 5 is a block diagram showing a configuration of an insulation monitoring apparatus of a hybrid electric vehicle according to an embodiment of the present invention, as shown in fig. 5, the apparatus including: an acquisition module 10 for acquiring an operation state of the hybrid electric vehicle; and the monitoring module 20 is used for determining a monitoring point where the first switch and the second switch are communicated according to the running state and carrying out insulation monitoring on the inside or the outside of the power battery.
Optionally, the monitoring module 20 comprises: a first determining unit (not shown in the figure) for determining that the positive contactor and the negative contactor are both in a closed state according to the operation state; a first monitoring unit (not shown in the figure) for alternately controlling the first switch to be communicated with the second monitoring point and the second switch to be communicated with the fourth monitoring point to perform insulation monitoring on the interior of the power battery, wherein when the insulation value of the equivalent insulation resistance in the power battery is larger than a first preset threshold value, the high-voltage system in the hybrid electric vehicle is determined to work normally, when the insulation value is larger than a second preset threshold value and smaller than a first preset threshold value, recording a diagnosis fault code, when the insulation value is larger than a third preset threshold value and smaller than a second preset threshold value, recording a diagnosis fault code, lightening an instrument fault lamp, controlling the hybrid electric vehicle to enter a power-limited driving state, when the insulation value is less than a third preset threshold value, recording a diagnosis fault code, lighting a fault lamp of the instrument, and cutting off the power supply of the hybrid electric vehicle or reducing the power of the hybrid electric vehicle according to the current vehicle speed of the hybrid electric vehicle.
Optionally, the monitoring module 20 comprises: a second determining unit (not shown in the figure) for determining that the positive contactor and the negative contactor are not in a closed state according to the operation state; a second monitoring unit (not shown in the figure) for alternately controlling the first switch to be communicated with the first monitoring point and the second switch to be communicated with the third monitoring point, carrying out insulation monitoring on the outside of the power battery, wherein when the insulation value of the equivalent insulation resistance in the power battery is larger than a first preset threshold value, the high-voltage system in the hybrid electric vehicle is determined to work normally, when the insulation value is larger than a second preset threshold value and smaller than a first preset threshold value, recording a diagnosis fault code, when the insulation value is larger than a third preset threshold value and smaller than a second preset threshold value, recording a diagnosis fault code, lightening an instrument fault lamp, controlling the hybrid electric vehicle to enter a power-limited driving state, when the insulation value is less than a third preset threshold value, recording a diagnosis fault code, lighting a fault lamp of the instrument, and cutting off the power supply of the hybrid electric vehicle or reducing the power of the hybrid electric vehicle according to the current vehicle speed of the hybrid electric vehicle.
Optionally, the monitoring module 20 comprises: a third determining unit (not shown in the figure) for determining that the positive contactor and the negative contactor are both in an unclosed state, the driving motor inside the hybrid electric vehicle is in a non-power generation state, and the hybrid electric vehicle is in a power-on state according to the operation state; and a third monitoring unit (not shown in the figure) for alternately controlling the first switch to be communicated with the second monitoring point and the second switch to be communicated with the fourth monitoring point to perform insulation monitoring on the inside of the power battery, wherein when the insulation value of the equivalent insulation resistance inside the power battery is greater than a first preset threshold value, the high-voltage system in the hybrid electric vehicle is determined to normally work, when the insulation value is greater than a second preset threshold value and less than the first preset threshold value, the diagnostic fault code is recorded, when the insulation value is greater than a third preset threshold value and less than the second preset threshold value, the diagnostic fault code is recorded, the instrument fault lamp is lightened, the hybrid electric vehicle is controlled to enter a power-limited driving state, and when the insulation value is less than the third preset threshold value, the diagnostic fault code is recorded, the instrument fault lamp is lightened, and the high-voltage component in the hybrid electric vehicle is controlled to stop working.
Optionally, the monitoring module 20 comprises: a fourth determining unit (not shown in the figure) for determining that the positive contactor and the negative contactor are both in an unclosed state, the driving motor is driven by an engine in the hybrid electric vehicle to be in a power generation state, and the hybrid electric vehicle is not in a power-on state according to the operating state; and a fourth monitoring unit (not shown in the figure) for determining that the hybrid electric vehicle is not in the working state, stopping insulation monitoring of the inside or outside of the power battery, and entering a sleep mode.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
In the above embodiments of the present invention, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
In the embodiments provided in the present application, it should be understood that the disclosed technology can be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units may be a logical division, and in actual implementation, there may be another division, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, units or modules, and may be in an electrical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic or optical disk, and other various media capable of storing program codes.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (11)
1. An insulation monitoring method for a hybrid electric vehicle, the hybrid electric vehicle comprising: a power battery; the power battery includes: the monitoring device comprises a positive contactor, a negative contactor, a first switch and a second switch, wherein a first monitoring point is arranged at the first end of the positive contactor, a second monitoring point is arranged at the second end of the positive contactor, a third monitoring point is arranged at the first end of the negative contactor, and a fourth monitoring point is arranged at the first end of the negative contactor; the method comprises the following steps:
acquiring the running state of the hybrid electric vehicle;
and determining a monitoring point for communicating the first switch and the second switch according to the running state, and carrying out insulation monitoring on the inside or the outside of the power battery.
2. The method of claim 1, wherein a monitoring point at which the first switch and the second switch are communicated is determined according to the operating state, and insulation monitoring of the inside or the outside of the power battery comprises:
determining that the positive contactor and the negative contactor are both in a closed state according to the running state;
alternately controlling the first switch to be communicated with the second monitoring point and the second switch to be communicated with the fourth monitoring point to monitor the insulation of the interior of the power battery, wherein when the insulation value of the equivalent insulation resistance in the power battery is larger than a first preset threshold value, the high-voltage system in the hybrid electric vehicle is determined to work normally, recording a diagnostic fault code when the insulation value is greater than a second preset threshold value and less than the first preset threshold value, when the insulation value is greater than a third preset threshold value and less than a second preset threshold value, recording the diagnosis fault code, lighting an instrument fault lamp, and controlling the hybrid electric vehicle to enter a power-limited driving state, and when the insulation value is smaller than the third preset threshold value, recording the diagnosis fault code, lighting the instrument fault lamp, and cutting off the power supply of the hybrid electric vehicle according to the current speed of the hybrid electric vehicle.
And reducing the power of the hybrid electric vehicle.
3. The method of claim 1, wherein a monitoring point at which the first switch and the second switch are communicated is determined according to the operating state, and insulation monitoring of the inside or the outside of the power battery comprises:
determining that the positive contactor and the negative contactor are not in a closed state according to the running state;
alternately controlling the first switch to be communicated with the first monitoring point and the second switch to be communicated with the third monitoring point to monitor the insulation of the exterior of the power battery, wherein when the insulation value of the equivalent insulation resistance in the power battery is larger than a first preset threshold value, the high-voltage system in the hybrid electric vehicle is determined to work normally, recording a diagnostic fault code when the insulation value is greater than a second preset threshold value and less than the first preset threshold value, when the insulation value is greater than a third preset threshold value and less than a second preset threshold value, recording the diagnosis fault code, lighting an instrument fault lamp, and controlling the hybrid electric vehicle to enter a power-limited driving state, and when the insulation value is smaller than the third preset threshold value, recording the diagnosis fault code, lighting the instrument fault lamp, and cutting off the power supply of the hybrid electric vehicle according to the current speed of the hybrid electric vehicle.
And reducing the power of the hybrid electric vehicle.
4. The method of claim 1, wherein a monitoring point at which the first switch and the second switch are communicated is determined according to the operating state, and insulation monitoring of the inside or the outside of the power battery comprises:
determining that the positive contactor and the negative contactor are not closed, a driving motor in the hybrid electric vehicle is not in a power generation state, and the hybrid electric vehicle is in a power-on state according to the running state;
alternately controlling the first switch to be communicated with the second monitoring point and the second switch to be communicated with the fourth monitoring point to monitor the insulation of the interior of the power battery, wherein when the insulation value of the equivalent insulation resistance in the power battery is larger than a first preset threshold value, the high-voltage system in the hybrid electric vehicle is determined to work normally, recording a diagnostic fault code when the insulation value is greater than a second preset threshold value and less than the first preset threshold value, when the insulation value is greater than a third preset threshold value and less than a second preset threshold value, recording the diagnosis fault code, lighting an instrument fault lamp, and controlling the hybrid electric vehicle to enter a power-limited driving state, and when the insulation value is smaller than the third preset threshold value, recording the diagnosis fault code, lightening the instrument fault lamp and controlling a high-voltage component in the hybrid electric vehicle to stop working.
5. The method of claim 1, wherein a monitoring point at which the first switch and the second switch are communicated is determined according to the operating state, and insulation monitoring of the inside or the outside of the power battery comprises:
determining that the positive contactor and the negative contactor are not in a closed state, an engine in the hybrid electric vehicle drives a driving motor to be in a power generation state, and the hybrid electric vehicle is not in a power-on state according to the running state;
and determining that the hybrid electric vehicle is not in a working state, stopping insulation monitoring on the inside or outside of the power battery and entering a sleep mode.
6. An insulation monitoring device of a hybrid electric vehicle, characterized in that the hybrid electric vehicle includes: a power battery; the power battery includes: the monitoring device comprises a positive contactor, a negative contactor, a first switch and a second switch, wherein a first monitoring point is arranged at the first end of the positive contactor, a second monitoring point is arranged at the second end of the positive contactor, a third monitoring point is arranged at the first end of the negative contactor, and a fourth monitoring point is arranged at the first end of the negative contactor; the device comprises:
the acquisition module is used for acquiring the running state of the hybrid electric vehicle;
and the monitoring module is used for determining a monitoring point communicated with the first switch and the second switch according to the running state and carrying out insulation monitoring on the inside or the outside of the power battery.
7. The apparatus of claim 6, wherein the monitoring module comprises:
the first determining unit is used for determining that the positive contactor and the negative contactor are both in a closed state according to the running state;
a first monitoring unit for alternately controlling the first switch to be communicated with the second monitoring point and the second switch to be communicated with the fourth monitoring point to monitor the inside of the power battery in an insulating manner, wherein when the insulation value of the equivalent insulation resistance in the power battery is greater than a first preset threshold value, the high-voltage system in the hybrid electric vehicle is determined to work normally, when the insulation value is greater than a second preset threshold value and less than the first preset threshold value, a diagnostic fault code is recorded, when the insulation value is greater than a third preset threshold value and less than the second preset threshold value, the diagnostic fault code is recorded, an instrument fault lamp is lightened, the hybrid electric vehicle is controlled to enter a power-limiting driving state, when the insulation value is less than the third preset threshold value, the diagnostic fault code is recorded, and the instrument fault lamp is lightened, and cutting off the power supply of the hybrid electric vehicle or reducing the power of the hybrid electric vehicle according to the current vehicle speed of the hybrid electric vehicle.
8. The apparatus of claim 6, wherein the monitoring module comprises:
the second determining unit is used for determining that the positive contactor and the negative contactor are not in a closed state according to the running state;
a second monitoring unit for alternately controlling the first switch to be communicated with the first monitoring point and the second switch to be communicated with the third monitoring point to monitor the outside of the power battery in an insulating manner, wherein when the insulation value of the equivalent insulation resistance inside the power battery is greater than a first preset threshold value, the high-voltage system in the hybrid electric vehicle is determined to work normally, when the insulation value is greater than a second preset threshold value and less than the first preset threshold value, a diagnostic fault code is recorded, when the insulation value is greater than a third preset threshold value and less than the second preset threshold value, the diagnostic fault code is recorded, an instrument fault lamp is lightened, the hybrid electric vehicle is controlled to enter a power-limited driving state, when the insulation value is less than the third preset threshold value, the diagnostic fault code is recorded, and the instrument fault lamp is lightened, and cutting off the power supply of the hybrid electric vehicle or reducing the power of the hybrid electric vehicle according to the current vehicle speed of the hybrid electric vehicle.
9. The apparatus of claim 6, wherein the monitoring module comprises:
a third determining unit, configured to determine, according to the operating state, that the positive contactor and the negative contactor are both in a non-closed state, that a driving motor inside the hybrid electric vehicle is in a non-power-generation state, and that the hybrid electric vehicle is in a power-on state;
a third monitoring unit for alternately controlling the first switch to be communicated with the second monitoring point and the second switch to be communicated with the fourth monitoring point to monitor the inside of the power battery in an insulating manner, wherein when the insulation value of the equivalent insulation resistance in the power battery is greater than a first preset threshold value, the high-voltage system in the hybrid electric vehicle is determined to work normally, when the insulation value is greater than a second preset threshold value and less than the first preset threshold value, a diagnostic fault code is recorded, when the insulation value is greater than a third preset threshold value and less than the second preset threshold value, the diagnostic fault code is recorded, an instrument fault lamp is lightened, the hybrid electric vehicle is controlled to enter a power-limiting driving state, when the insulation value is less than the third preset threshold value, the diagnostic fault code is recorded, and the instrument fault lamp is lightened, and controlling a high-voltage component in the hybrid electric vehicle to stop working.
10. The apparatus of claim 6, wherein the monitoring module comprises:
a fourth determining unit, configured to determine, according to the operating state, that the positive contactor and the negative contactor are both in an unclosed state, that an engine inside the hybrid electric vehicle drives a driving motor to be in a power generation state, and that the hybrid electric vehicle is not in a power-on state;
and the fourth monitoring unit is used for determining that the hybrid electric vehicle is not in a working state, stopping performing insulation monitoring on the inside or the outside of the power battery and entering a sleep mode.
11. A hybrid electric vehicle, characterized by comprising: a power cell and the insulation monitoring device of any one of claims 6-10; the power battery includes: the first end of the positive contactor is provided with a first monitoring point, the second end of the positive contactor is provided with a second monitoring point, the first end of the negative contactor is provided with a third monitoring point, and the first end of the negative contactor is provided with a fourth monitoring point.
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| CN201810747059.5A CN110696619A (en) | 2018-07-09 | 2018-07-09 | Insulation monitoring method and device for hybrid electric vehicle and hybrid electric vehicle |
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