CN111650541B - Electric automobile high pressure interlocking detecting system and electric automobile - Google Patents
Electric automobile high pressure interlocking detecting system and electric automobile Download PDFInfo
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Abstract
The invention discloses an electric automobile high-voltage interlocking detection system and an electric automobile, which comprise a vehicle control unit and a high-voltage connector, wherein the vehicle control unit comprises a low-side switch module and a micro control module, the low-side switch module is used for carrying out output port diagnosis processing and obtaining an output port diagnosis result, and the output port diagnosis result is input to the micro control module through the input end of the micro control module; the micro control module is used for processing the acquired output port diagnosis result, the pulse signal of the pulse signal output port and the output signal of the output end of the high-voltage interlocking loop to obtain a high-voltage connector diagnosis result so as to judge whether the high-voltage connector is abnormal or not. The output port diagnosis result is output through the low-side switch module, the low-side switch module has a signal diagnosis function, and the low-side switch module can diagnose whether the output end of the low-side switch module is open circuit or short circuit, so that the circuit is not damaged, the misjudgment is avoided, and the detection result is more accurate.
Description
Technical Field
The invention relates to the technical field of automobile manufacturing, in particular to an electric automobile high-voltage interlocking detection system and an electric automobile.
Background
With the rapid development of economy, the problems of energy and environmental protection are increasingly prominent, and countries around the world begin to aim at energy-saving and environment-friendly electric automobiles. Compared with the traditional vehicle, the electric vehicle is additionally provided with high-voltage electric equipment or power supply equipment such as a motor, a motor controller, a DC/DC converter, a high-voltage battery pack and the like. Therefore, the potential hazard of high-voltage electric injury of the electric automobile is completely different from that of the traditional vehicle, and the voltage of the electric automobile is higher than 300V and the current which can reach tens of even hundreds of amperes can influence the safe use of the electric automobile at any time, so that the safety protection of the whole vehicle high-voltage system is very important.
From a regulatory perspective, for example, GB/T18384.3-2015 part 3 of electric vehicle safety requirements: protection against electric shock for persons "is mentioned at 6.6.1: "if the barrier/housing allows direct access, it can only be opened or removed by a tool or service key, or there is some way to de-energize the class B voltage live section, such as interlocking". The Interlock here generally refers to an HVIL (High Voltage Interlock Loop) that detects the electrical integrity or connectivity of High Voltage components, wires, and connectors through a low Voltage Loop, identifies an abnormal disconnection of the Loop, and timely disconnects the controller of the High Voltage input. When the HVIL is faulty, to ensure that the high voltage system is safely powered off in a proper manner, the high voltage system cannot be powered on before troubleshooting, and simultaneously a corresponding DTC (Diagnostic Trouble Code) is triggered. When the high-voltage module is disconnected from the high-voltage circuit, attention should be paid to the capacitive load in the high-voltage circuit and the electrification of the high-voltage cable to prevent an operator from getting an electric shock. When the vehicle normally works, electric shock caused by local heating and arc discharge due to manual misoperation, vehicle vibration, product aging and circuit abrasion is prevented.
Specifically, the existing high-voltage interlock detection circuit or method mainly includes the following three types:
the first method comprises the following steps: as shown in fig. 1, the HVIL _ OUT signal line is directly connected to the power supply inside the VCU, which also has the following disadvantages: if a short to ground occurs and the shorting point is on the HVIL OUT signal side, the wires or VCU circuit board will burn. If the power supply is short-circuited and the short-circuit point is on the HVIL _ IN signal side, the VCU detects that the HVIL _ IN signal is high level when the front-end high-voltage connector of the fault point is not plugged, the circuit is mistakenly considered to be normal, and the normal detection function is lost.
And the second method comprises the following steps: as shown in fig. 2, the HVIL _ OUT signal line is directly grounded in a VCU (Vehicle Control Unit), which has the following disadvantages: if a short circuit to the power supply occurs and the short circuit point is on the HVIL _ OUT signal side, the wiring or VCU circuit board will burn. If a short circuit to the ground occurs and the short circuit point is on the HVIL _ IN signal side, so that a high-voltage connector at the front end of the fault point is not plugged, the VCU detects that the HVIL _ IN signal is low level, the circuit is mistakenly considered to be normal, and the normal detection function is lost.
And the third is that: the method for adding the hardware circuit module is mainly provided with a watchdog module, a timing dog feeding mechanism for setting the dog feeding time or a differential amplifier and a comparator, and the method needs to additionally increase hardware materials, so that the cost investment is increased, and the complexity is increased for the circuit design.
Therefore, in order to solve the technical problems of the three common high-voltage interlocking detection circuits or methods, the application aims to provide a high-voltage interlocking detection circuit which is safer and has more accurate detection results.
Disclosure of Invention
The invention aims to solve the problem that the detection result of a high-voltage interlocking detection circuit or method in the prior art is inaccurate.
In order to solve the technical problem, the embodiment of the invention discloses a high-voltage interlocking detection system, which comprises a vehicle control unit and a high-voltage connector, wherein the vehicle control unit comprises a low-side switch module and a micro control module, the low-side switch module is connected to the input end of a high-voltage interlocking loop of the high-voltage connector, and the micro control module is connected to the output end of the high-voltage interlocking loop; wherein,
the input end of the low-side switch module is connected to a pulse signal output port of the micro control module, the output end of the low-side switch module is connected to the input end of the high-voltage interlocking loop, and the low-side switch module is used for performing output port diagnosis processing, obtaining an output port diagnosis result and inputting the output port diagnosis result to the micro control module through the input end of the micro control module;
the input end of the micro control module is connected to the output end of the high-voltage interlocking loop, and the micro control module is used for processing the acquired output port diagnosis result, the pulse signal of the pulse signal output port and the output signal of the output end of the high-voltage interlocking loop to obtain a high-voltage connector diagnosis result so as to judge whether the high-voltage connector is abnormal or not.
By adopting the technical scheme, compared with the three detection methods in the prior art, the detection method has the advantages that the detection is inaccurate due to information misjudgment possibly caused by the fact that the output signal is a fixed value, (the specific output signal is that the fixed value lacks sensing capability for line short-circuit faults and line open-circuit faults, the detection for a high-voltage interlocking circuit is possibly misjudged, and the line short circuit possibly causes line burnout), the output signal in the method is output through the low-side switch module, and the low-side switch module has a signal diagnosis function and can diagnose whether the output end is open-circuit or short-circuit, so that the circuit is not damaged, the misjudgment is avoided, and the detection result is more accurate.
According to another specific embodiment of the invention, in the high-voltage interlock detection system for the electric vehicle disclosed by the embodiment of the invention, the low-side switch module comprises a channel diagnosis submodule, the micro-control module comprises a low-side switch diagnosis and analysis submodule, a fault code is stored in the low-side switch diagnosis and analysis submodule, and the channel diagnosis submodule is connected with the low-side switch diagnosis and analysis submodule through a serial peripheral device interface bus, wherein the channel diagnosis submodule is used for performing output port diagnosis processing to obtain an output port diagnosis result and transmitting the output port diagnosis result to the low-side switch diagnosis and analysis submodule through the serial peripheral device interface bus; and the low-side switch diagnosis and analysis submodule is used for analyzing the output port diagnosis result to obtain a corresponding fault code.
According to another specific embodiment of the invention, in the high-voltage interlock detection system for an electric vehicle disclosed in the embodiment of the invention, the low-side switch module further comprises a signal transceiving submodule, the signal transceiving submodule is connected with the pulse signal output port through the input/output control port, and the pulse signal output port is used for generating a pulse signal and transmitting the pulse signal to the signal transceiving submodule through the input/output control port so that an output signal at the output end of the low-side switch module is output along with the pulse signal; and the input signal is a signal returned after the output signal passes through the high-voltage interlocking loop.
According to another specific embodiment of the invention, the micro control module of the high-voltage interlock detection system for the electric vehicle disclosed by the embodiment of the invention further comprises a first operation sub-module and a second operation sub-module, wherein the first operation sub-module is connected with the pulse signal output port, the input signal is input to the first operation sub-module, and the first operation sub-module is used for performing first processing on the pulse signal and the input signal to obtain a first processing result;
the second operation submodule is connected with the output end of the first operation submodule to obtain a first processing result, is connected with the output end of the low-side switch diagnosis and analysis submodule to obtain a fault code, and carries out second processing on the first processing result and the fault code to obtain a high-voltage connector diagnosis result.
According to another specific embodiment of the invention, in the electric vehicle high-voltage interlock detection system disclosed in the embodiment of the invention, the first process is an exclusive-nor process, the second process is an and process, and the output end of the low-side switch diagnosis and analysis submodule is an output end indicating that the output port is not faulty.
According to another specific embodiment of the invention, the electric vehicle high-voltage interlock detection system disclosed in the embodiment of the invention further comprises a signal conditioning module, wherein the signal conditioning module is respectively connected with the output end of the high-voltage interlock loop and the first operation submodule, and is used for performing voltage conditioning on an output signal output by the output end of the high-voltage interlock loop and then transmitting the output signal to the first operation submodule.
According to another specific embodiment of the invention, in the high-voltage interlock detection system for the electric vehicle disclosed by the embodiment of the invention, the signal conditioning module comprises a resistor submodule, a capacitor submodule and a diode submodule which are connected with each other, and the resistor submodule comprises a first resistor, a second resistor and a third resistor; the capacitor submodule comprises a first capacitor; the diode submodule comprises a first diode and a second diode;
the first end of the second resistor is connected with the input end, and the second end of the second resistor is connected with the first operation submodule;
the first end of the first resistor is connected with the main voltage, and the second end of the first resistor is connected with the first end of the second resistor;
the first end of the third resistor is connected with the second end of the second resistor, and the second end of the third resistor is grounded;
the first end of the first capacitor is connected with the second end of the second resistor, and the first capacitor is grounded;
the first end of the first diode is connected with the port voltage, and the second end of the first diode is connected with the second end of the second resistor;
the first end of the second diode is connected with the second end of the second resistor, and the second end of the second diode is grounded.
According to another specific embodiment of the present invention, an electric vehicle high-voltage interlock detection system is disclosed, wherein the fault code comprises: the code 00 indicates that the output port is short-circuited to the ground, the code 01 indicates that the load of the output port is open, the code 10 indicates that the output port is over-current and over-temperature, and the code 11 indicates that the output port is not faulty.
According to another embodiment of the invention, the high-voltage connector diagnosis result of the electric vehicle high-voltage interlock detection system disclosed by the embodiment of the invention comprises 1 and 0, wherein 1 represents that the high-voltage connector connection is not abnormal, and 0 represents that the high-voltage connector connection is in fault.
The invention also provides an electric automobile which comprises the electric automobile high-voltage interlocking detection system.
The invention has the beneficial effects that:
the invention provides an electric automobile high-voltage interlocking detection system, which comprises a vehicle control unit and a high-voltage connector, wherein the vehicle control unit comprises a low-side switch module and a micro-control module, the low-side switch module is connected to the input end of a high-voltage interlocking loop of the high-voltage connector, and the micro-control module is connected to the output end of the high-voltage interlocking loop; wherein,
the input end of the low-side switch module is connected to a pulse signal output port of the micro control module, the output end of the low-side switch module is connected to the input end of the high-voltage interlocking loop, and the low-side switch module is used for performing output port diagnosis processing, obtaining an output port diagnosis result and inputting the output port diagnosis result to the micro control module through the input end of the micro control module;
the input end of the micro control module is connected to the output end of the high-voltage interlocking loop, and the micro control module is used for processing the acquired output port diagnosis result, the pulse signal of the pulse signal output port and the output signal of the output end of the high-voltage interlocking loop to obtain a high-voltage connector diagnosis result so as to judge whether the high-voltage connector is abnormal or not.
Compared with the three detection methods in the prior art, the detection method has the advantages that the detection is inaccurate due to information misjudgment possibly caused by the fact that the output port diagnosis result is a fixed value, (the specific output port diagnosis result is that the fixed value lacks sensing capability for line short-circuit faults and line open-circuit faults, the detection for a high-voltage interlocking circuit is possibly misjudged, and the line is possibly burnt down due to the line short circuit), the output port diagnosis result in the method is output through the low-side switch module, the low-side switch module has a signal diagnosis function, and can diagnose whether the output end of the low-side switch module is open-circuit or short-circuit, so that the line is not damaged, misjudgment is avoided, and the detection result is more accurate.
Drawings
Fig. 1 is a schematic circuit structure diagram of a first electric vehicle high-voltage interlock detection system provided in the prior art;
fig. 2 is a schematic circuit structure diagram of a second electric vehicle high-voltage interlock detection system provided in the prior art;
fig. 3 is a schematic circuit structure diagram of the electric vehicle high-voltage interlock detection system provided in this embodiment 1.
Description of reference numerals:
110: a vehicle control unit;
1101: a low-side switch module; 11011: a channel diagnostic submodule; 11012: a signal transceiving submodule;
1102: a micro control module; 11021: a low-side switch diagnosis and analysis submodule;
11022: a pulse signal output port; 11023: a first operation submodule; 11024: a second operation submodule; 11025: a signal conditioning module;
1103: a serial peripheral interface bus;
1104: an input/output control port;
120: a high voltage connector.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure. While the invention will be described in conjunction with the preferred embodiments, it is not intended that features of the invention be limited to these embodiments. On the contrary, the invention is described in connection with the embodiments for the purpose of covering alternatives or modifications that may be extended based on the claims of the present invention. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The invention may be practiced without these particulars. Moreover, some of the specific details have been omitted from the description in order not to obscure or obscure the focus of the present invention. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
It should be noted that in this specification, like reference numerals and letters refer to like items in the following drawings, and thus, once an item is defined in one drawing, it need not be further defined and explained in subsequent drawings.
In the description of the present embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that are conventionally placed when the products of the present invention are used, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements indicated must have specific orientations, be configured in specific orientations, and operate, and thus, should not be construed as limiting the present invention.
The terms "first," "second," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
In the description of the present embodiment, it should be further noted that, unless explicitly stated or limited otherwise, the terms "disposed," "connected," and "connected" are to be interpreted broadly, e.g., as a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. Specific meanings of the above terms in the present embodiment can be understood as specific cases by those of ordinary skill in the art.
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Example 1
In order to solve the problem that the detection result of the high-voltage interlock detection circuit or method in the prior art is inaccurate, as shown in fig. 3, the embodiment of the embodiment discloses a high-voltage interlock detection system, and the high-voltage interlock detection system is used for an electric vehicle. The high-voltage interlock detection system includes a vehicle control unit 110 and a high-voltage connector 120, and the electric vehicle generally has a plurality of high-voltage connectors 120, and the embodiment is described by taking 3 high-voltage connectors 120 in fig. 3 as an example. In particular use, the high voltage interlock detection system 100 is used to detect the electrical integrity or connectivity of the high voltage connector 120 or other conductors associated therewith, identify anomalies between the high voltage connector 120 or and the conductors, and timely disconnect the vehicle control unit 110 upon identification of the anomalies.
More specifically, as shown in fig. 3, the vehicle control unit 110 includes a low-side switch module 1101 and a micro control module 1102, where the low-side switch module 1101 has a port diagnosis function, and can diagnose whether an output port is short-circuited or open-circuited, so as to ensure that a line is not damaged. Specifically, the low-side switch module 1101 is connected to an input end of a high-voltage interlock loop of the high-voltage connector 1102, and the micro control module 1102 is connected to an output end of the high-voltage interlock loop, so that the low-side switch module 1101, the high-voltage connector 1102 and the micro control module 1102 are communicated with each other to form the high-voltage interlock loop.
The low-side switch module in the embodiment has a signal diagnosis function, and can diagnose whether the output end of the low-side switch module is open or short-circuited, so that the circuit is not damaged, misjudgment is avoided, and the detection result is more accurate. Specifically, a diagnosis module is integrated in the low-side switch module 1101, and can identify the state of each output channel, and DRn (0: 1) is 00 when an output short circuit occurs; if the output is open, DRn (0: 1) is 01; if output over-current, DRn (0: 1) is equal to 10; if there is no abnormal output, DRn (0: 1) ═ 11, the micro control module 1102 reads the DRn value through the serial peripheral interface bus 1103(SPI), and the low side switch diagnostic analysis sub-module 11021 in the micro control module 1102 sets corresponding signals according to the returned value, such as SG, OL, OCT, and OK signals in the figure. In addition, the low-side switch module 1101 having the port diagnosis function may be specifically a diagnosis chip or the like capable of performing port diagnosis, so as to implement the port diagnosis function to be satisfied by the present embodiment.
More specifically, an input end of the low-side switch module 1101 is connected to the pulse signal output port 11022 of the micro control module 1102, an output end of the low-side switch module 1101 is connected to an input end of the high-voltage interlock loop, the low-side switch module 1101 is configured to perform output port diagnosis processing and obtain an output port diagnosis result, and input the output port diagnosis result to the micro control module 1102 through the input end of the micro control module 1102, an input end of the micro control module 1102 is connected to an output end of the high-voltage interlock loop, and the micro control module 1102 is configured to process the obtained output port diagnosis result, the pulse signal of the pulse signal output port 11021, and the output signal of the output end of the high-voltage interlock loop to obtain a high-voltage connector diagnosis result so as to determine whether the high-voltage connector is abnormal.
Compared with the three detection methods in the prior art, the detection process has the advantages that the detection is inaccurate due to information misjudgment possibly caused by the fact that the output port is a fixed value, (the specific output port is that the fixed value lacks sensing capability for line short-circuit faults and line open-circuit faults, the detection for a high-voltage interlocking loop is possibly misjudged, and the line is possibly burnt due to the line short circuit), the low-side switch module in the embodiment has a signal diagnosis function, and can diagnose whether the output end is open-circuit or short-circuit to obtain the output port diagnosis result, so that the line is not damaged, the misjudgment is avoided, and the detection result is more accurate.
As shown in fig. 3, according to another specific embodiment of this embodiment, in the high-voltage interlock detection system for an electric vehicle disclosed in the embodiment of this embodiment, the low-side switch module 1101 includes a channel diagnosis submodule 11011, the micro-control module 1102 includes a low-side switch diagnosis analysis submodule 11021, the low-side switch diagnosis analysis submodule 11021 stores a fault code, the channel diagnosis submodule 11011 is connected to the low-side switch diagnosis analysis submodule 11021 through a serial peripheral device interface bus 1103, where the channel diagnosis submodule 1101 is configured to perform output port diagnosis processing to obtain an output port diagnosis result, and transmit the output port diagnosis result to the low-side switch diagnosis analysis submodule 11021 through the serial peripheral device interface bus 1103; the low-side switch diagnosis and analysis sub-module 11021 is configured to analyze the output port diagnosis result to obtain a corresponding fault code, so as to determine whether a short-circuit fault or a line open circuit exists in the line, avoid misjudgment caused by detection of a high-voltage interlock loop, and prevent the line from being burnt out due to a line short circuit.
As shown in fig. 3, according to another specific embodiment of this embodiment, in the electric vehicle high-voltage interlock detection system disclosed in the embodiment of this embodiment, the low-side switch module 1101 further includes a signal transceiver sub-module 11012, the signal transceiver sub-module 11012 and the pulse signal output port 11022 are connected through an input/output control port 1104(I/O), and the pulse signal output port 11022 is configured to generate a pulse signal and transmit the pulse signal to the signal transceiver sub-module 11012 through the input/output control port 1104 so that an output signal at an output terminal of the low-side switch module 1101 follows the pulse signal to be output; and the input signal is a signal returned after the output signal passes through the high-voltage interlocking loop. In a specific operation, the pulse signal output port 11022 is operable to continuously output the interlock detection signal, the signal transceiver sub-module 11012 receives the interlock detection signal and feeds the interlock detection signal back to the micro control module 1102 through the output terminal of the low side switch module 1101 via the high voltage connector 120, so that the micro control module 1102 processes the interlock detection signal (i.e., the output signal of the output terminal of the high voltage interlock loop), the output port diagnosis result, and the pulse signal of the pulse signal output port 11021 to obtain the high voltage connector diagnosis result so as to determine whether the high voltage connector 120 is abnormal. The signal transceiver sub-module 11012 may be a signal transceiver or the like commonly known in the art, and the pulse signal output port 11022 may be a pulse generator commonly known in the art.
As shown in fig. 3, according to another specific implementation manner of this embodiment, in the electric vehicle high-voltage interlock detection system disclosed in the implementation manner of this embodiment, the micro control module 1102 further includes a first operation sub-module 11023 and a second operation sub-module 11024, the first operation sub-module 11023 is connected to the pulse signal output port 11022, and an input signal is input to the first operation sub-module 11023, and the first operation sub-module 11023 is configured to perform first processing on the pulse signal and an output signal of the output end of the high-voltage interlock loop to obtain a first processing result; the second operation submodule 11024 is connected to an output end of the first operation submodule 11023 to obtain a first processing result, is connected to an output end of the low-side switch diagnosis and analysis submodule 11021 to obtain a fault code, and performs second processing on the first processing result and the fault code to obtain a high-voltage connector diagnosis result. The first operation sub-module 11023 and the second operation sub-module 11024 may be a simulink relationship operation module, configured to perform various operation relationships, and specifically may select which operation rule module according to actual needs, which is described in detail below.
As shown in fig. 3, according to another specific implementation of this embodiment, the implementation of this embodiment discloses an electric vehicle high-voltage interlock detection system, in which the first process is an exclusive nor process, the exclusive nor process refers to a known exclusive nor process rule, and the second process is an exclusive nor process, and the exclusive nor process refers to a known exclusive nor process rule. It can be understood that both the first processing and the second processing can be realized through matlab/simulink model design, for example, the first processing can select a simulink exclusive nor relation operation module, and the second processing can select a simulink and relation operation module, which is a commonly used technical means in the prior art, so that this embodiment will not be described too much. The output end of the low-side switch diagnostic analysis submodule 11021 is an output end indicating that the output port is fault-free, that is, the output end of the low-side switch diagnostic analysis submodule 11021 is only used for outputting a fault-free diagnostic analysis result, and then, whether the high-voltage connector 120 is in fault judgment processing operation is cooperatively performed.
As shown in fig. 3, according to another specific embodiment of the present embodiment, the high-voltage interlock detection system of an electric vehicle disclosed in the embodiment of the present embodiment further includes a signal conditioning module 11025, where the signal conditioning module 11025 is respectively connected to an output end of the high-voltage interlock loop and the first operation sub-module 11023, and is configured to perform voltage conditioning on an output signal output by the output end of the high-voltage interlock loop and then transmit the output signal to the first operation sub-module 11023. Specifically, the signal conditioning module 11025 is used to adjust the signal voltage output from the high voltage connector 120 to be converted into the voltage allowed by the micro control module 1102. For example, the operating voltage of the high voltage connector 120 is 12V, and the allowable operating voltage of the micro control module 1102 is 3.3V, so the signal conditioning module 11025 needs to be set to reduce the signal voltage output by the low voltage connector 120.
As shown in fig. 3, according to another specific implementation manner of this embodiment, in the high-voltage interlock detection system for an electric vehicle disclosed in the implementation manner of this embodiment, the signal conditioning module 11025 includes a resistor submodule, a capacitor submodule and a diode submodule which are connected to each other, and each element forms the signal conditioning module 11025 of this embodiment according to the structure shown in fig. 3, wherein the resistor submodule is used to adjust a high-voltage amplitude of a voltage signal, the diode submodule is used to prevent an instantaneous high voltage in a high-voltage interlock loop from damaging an electronic device, and the capacitor submodule plays a role in filtering, and can filter a peak value of the high-voltage value in the voltage signal.
Specifically, as shown in fig. 3, the resistor submodule includes a first resistor, a second resistor, and a third resistor; the capacitor submodule comprises a first capacitor; the diode submodule comprises a first diode and a second diode; the first end of the second resistor is connected with the input end, and the second end of the second resistor is connected with the first operation submodule; the first end of the first resistor is connected with the main voltage, and the second end of the first resistor is connected with the first end of the second resistor; the first end of the third resistor is connected with the second end of the second resistor, and the second end of the third resistor is grounded; the first end of the first capacitor is connected with the second end of the second resistor, the first end of the first diode which is grounded of the first capacitor is connected with the port voltage, and the second end of the first diode is connected with the second end of the second resistor; the first end of the second diode is connected with the second end of the second resistor, and the second end of the second diode is grounded. In addition, the structural composition of the signal conditioning module 11025 may not be limited to the structural example given in this embodiment, and only the voltage value that can adjust or convert the signal needs to be satisfied, which is not specifically limited in this embodiment.
As shown in fig. 3, according to another specific embodiment of this embodiment, the embodiment of this embodiment discloses an electric vehicle high-voltage interlock detection system, wherein the fault code includes: the code 00 indicates that the output port is short-circuited to the ground, the code 01 indicates that the load of the output port is open, the code 10 indicates that the output port is over-current and over-temperature, and the code 11 indicates that the output port is not faulty.
As shown in fig. 3, according to another specific embodiment of this embodiment, the embodiment of this embodiment discloses an electric vehicle high-voltage interlock detection system, and the high-voltage connector diagnosis result includes 1 and 0, where 1 indicates that there is no abnormality in the connection of the high- voltage connector 120, and 0 indicates that there is a fault in the connection of the high-voltage connector 120.
Example 2
The embodiment further provides an electric vehicle, which includes the electric vehicle high-voltage interlock detection system of embodiment 1 shown in fig. 3, and the electric vehicle high-voltage interlock detection system is installed on the electric vehicle to detect and detect the electrical integrity or connectivity of the high-voltage connector 120 or the wire and the high-voltage connector 120, identify whether a high-voltage interlock loop is abnormal, and disconnect the micro-control module 1102 in the high-voltage interlock detection system 100 in time when a fault is abnormal, so as to prevent a potential safety hazard that may be caused by manual operation. And when the vehicle normally works, the electric shock caused by local heating and arc discharge caused by improper manual operation, vehicle vibration, product aging and circuit abrasion is prevented.
While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that the foregoing is a more particular description of the invention than is possible with reference to the specific embodiments, and the specific embodiments of the invention are not to be considered as limited to those descriptions. Various changes in form and detail, including simple deductions or substitutions, may be made by those skilled in the art without departing from the spirit and scope of the invention.
Claims (9)
1. The high-voltage interlocking detection system of the electric automobile is characterized by comprising a vehicle control unit and a high-voltage connector, wherein the vehicle control unit comprises a low-side switch module and a micro-control module, the low-side switch module is connected to the input end of a high-voltage interlocking loop of the high-voltage connector, and the micro-control module is connected to the output end of the high-voltage interlocking loop; wherein,
the input end of the low-side switch module is connected to a pulse signal output port of the micro control module, the output end of the low-side switch module is connected to the input end of the high-voltage interlocking loop, and the low-side switch module is used for performing output port diagnosis processing, obtaining an output port diagnosis result and inputting the output port diagnosis result to the micro control module through the input end of the micro control module; the low-side switch module comprises a channel diagnosis submodule, the micro control module comprises a low-side switch diagnosis and analysis submodule, the low-side switch diagnosis and analysis submodule stores fault codes and is connected with the low-side switch diagnosis and analysis submodule through a serial peripheral device interface bus, wherein the channel diagnosis submodule is used for carrying out diagnosis processing on the output port to obtain a diagnosis result of the output port and transmitting the diagnosis result of the output port to the low-side switch diagnosis and analysis submodule through the serial peripheral device interface bus; the low-side switch diagnosis and analysis submodule is used for analyzing the output port diagnosis result to obtain the corresponding fault code;
the input end of the micro control module is connected to the output end of the high-voltage interlocking loop, and the micro control module is used for processing the acquired output port diagnosis result, the pulse signal of the pulse signal output port and the output signal of the output end of the high-voltage interlocking loop to obtain a high-voltage connector diagnosis result so as to judge whether the high-voltage connector is abnormal or not.
2. The high-voltage interlock detection system for electric vehicles according to claim 1, wherein the low-side switch module further comprises a signal transceiver sub-module, the signal transceiver sub-module and the pulse signal output port are connected through an input/output control port, and the pulse signal output port is used for generating the pulse signal and transmitting the pulse signal to the signal transceiver sub-module through the input/output control port so that the output signal at the output end of the low-side switch module follows the pulse signal output; and the input signal is the signal returned after the output signal passes through the high-voltage interlocking loop.
3. The high-voltage interlock detection system of an electric vehicle according to claim 2, wherein the micro control module further comprises a first operation sub-module and a second operation sub-module, the first operation sub-module is connected to the pulse signal output port, and an output signal of an output terminal of the high-voltage interlock loop is input to the first operation sub-module, the first operation sub-module is configured to perform a first processing on the pulse signal and an output signal of an output terminal of the high-voltage interlock loop to obtain a first processing result;
the second operation submodule is connected with the output end of the first operation submodule to obtain the first processing result, is connected with the output end of the low-side switch diagnosis analysis submodule to obtain the fault code, and carries out second processing on the first processing result and the fault code to obtain the high-voltage connector diagnosis result.
4. The electric vehicle high voltage interlock detection system of claim 3, wherein the first process is an exclusive-nor process, the second process is an and process, and the output of the low side switch diagnostic resolution submodule is an output indicating that the output port is not faulty.
5. The high-voltage interlock detection system of an electric vehicle according to claim 4, further comprising a signal conditioning module, wherein the signal conditioning module is respectively connected to the output end of the high-voltage interlock loop and the first arithmetic sub-module, and is configured to perform voltage conditioning on the output signal output by the output end of the high-voltage interlock loop and transmit the output signal to the first arithmetic sub-module.
6. The electric vehicle high voltage interlock detection system of claim 5, wherein the signal conditioning module comprises a resistor submodule, a capacitor submodule, and a diode submodule connected to each other, the resistor submodule comprising a first resistor, a second resistor, and a third resistor; the capacitance submodule comprises a first capacitance; the diode submodule comprises a first diode and a second diode;
the first end of the second resistor is connected with the input end, and the second end of the second resistor is connected with the first operation submodule;
the first end of the first resistor is connected with a main voltage, and the second end of the first resistor is connected with the first end of the second resistor;
the first end of the third resistor is connected with the second end of the second resistor, and the second end of the third resistor is grounded;
the first end of the first capacitor is connected with the second end of the second resistor, and the first capacitor is grounded;
a first end of the first diode is connected with a port voltage, and a second end of the first diode is connected with a second end of the second resistor;
and the first end of the second diode is connected with the second end of the second resistor, and the second end of the second diode is grounded.
7. The electric vehicle high voltage interlock detection system as recited in any one of claims 1-6, wherein the fault code comprises: the code 00 represents that the output port is short-circuited to the ground, the code 01 represents that the load of the output port is open, the code 10 represents that the output port is over-current and over-temperature, and the code 11 represents that the output port is not in fault.
8. The electric vehicle high voltage interlock detection system according to any one of claims 1-6, wherein the high voltage connector diagnostic result comprises 1 and 0, wherein 1 indicates no abnormality in the high voltage connector connection and 0 indicates a malfunction in the high voltage connector connection.
9. An electric vehicle characterized by comprising the electric vehicle high-voltage interlock detection system according to claim 8.
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| CN112213624B (en) * | 2020-09-29 | 2022-06-21 | 奇瑞新能源汽车股份有限公司 | Test device and method for verifying interlocking function of high-voltage loop of electric automobile |
| CN113448312A (en) * | 2021-06-22 | 2021-09-28 | 武汉海亿新能源科技有限公司 | Vehicle high-voltage interlocking accurate fault diagnosis device and control method thereof |
| CN114326687B (en) * | 2022-01-07 | 2024-05-24 | 摩登汽车有限公司 | Power domain controller of new energy vehicle and vehicle |
| CN116068382B (en) * | 2023-03-07 | 2023-07-21 | 深圳艾为电气技术有限公司 | Compressor port state detection system and detection method |
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