CN111422068A - Electric vehicle loop interlocking circuit and diagnosis method thereof - Google Patents
Electric vehicle loop interlocking circuit and diagnosis method thereof Download PDFInfo
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- CN111422068A CN111422068A CN202010207744.6A CN202010207744A CN111422068A CN 111422068 A CN111422068 A CN 111422068A CN 202010207744 A CN202010207744 A CN 202010207744A CN 111422068 A CN111422068 A CN 111422068A
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- 238000003745 diagnosis Methods 0.000 title abstract description 10
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- 238000002405 diagnostic procedure Methods 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 abstract description 12
- 206010014357 Electric shock Diseases 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
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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
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Abstract
The invention aims to provide an electric vehicle loop interlocking circuit and a diagnosis method thereof, which are used for quickly locking a fault point in the electric vehicle loop interlocking protection circuit, thereby reducing the maintenance cost and improving the maintenance efficiency. The electric automobile loop interlocking circuit consists of an interlocking signal sending module, an interlocking signal receiving module, a plurality of interlocking switches for detecting the state of a high-voltage component and connecting resistors with the number corresponding to that of the interlocking switches, wherein the corresponding interlocking switches and the connecting resistors are connected in series to form branches, all the branches are connected in parallel to form a parallel circuit, one end of the parallel circuit is connected with the interlocking signal sending module, and the other end of the parallel circuit is connected with the interlocking signal receiving module; the resistance values of the connecting resistors on the branches are different. The interlocking circuit and the diagnosis method thereof can quickly and accurately lock the fault position, are convenient for maintenance personnel to troubleshoot the fault, effectively reduce the after-sale cost and avoid the safety risk.
Description
Technical Field
The patent relates to the technical field of electric automobile high-voltage safety, in particular to a loop circuit interlocking circuit.
Background
Electric automobile adopts high-voltage electric energy as the power supply source, and when high-voltage plug-in components pulled out, plug-in components both ends will have high voltage electricity, and someone is electrocuted the risk. At present in the aspect of electric automobile high pressure safety protection, some vehicle designs have loop interlocking protection scheme, and the effect of loop interlocking is the real-time status that detects high voltage connector and high-voltage component casing to when preventing personnel when the connector not plug in close or when the casing was demolishd in the maintenance, thereby the electric shock risk that the high-pressure return circuit led to is touched in the mistake. Most of the protection strategies are relatively simple, and the existing protection scheme is as follows: and a loop interlocking signal sent by the vehicle controller is returned to the vehicle controller through the distribution box, the compressor and the DCDC (direct current conversion module), when a certain part in the loop goes wrong, the loop is disconnected, and the vehicle controller reports a starting protection strategy when detecting that no voltage exists.
The above solution is liable to bring about the following problems: the high-voltage components of the electric automobile are numerous, even more than 4 high-voltage and low-voltage connectors are arranged on some high-voltage components, the number of series points is large, and when an abnormal fault occurs, the specific fault reason and the fault point are difficult to investigate, so that the after-sale maintenance cost is very high.
Disclosure of Invention
The invention aims to provide an electric vehicle loop interlocking circuit and a diagnosis method thereof, which are used for quickly locking a fault point in the electric vehicle loop interlocking protection circuit, thereby reducing the maintenance cost and improving the maintenance efficiency.
The electric automobile loop interlocking circuit consists of an interlocking signal sending module, an interlocking signal receiving module, a plurality of interlocking switches for detecting the state of a high-voltage component and connecting resistors with the number corresponding to that of the interlocking switches, wherein the corresponding interlocking switches and the connecting resistors are connected in series to form branches, all the branches are connected in parallel to form a parallel circuit, one end of the parallel circuit is connected with the interlocking signal sending module, and the other end of the parallel circuit is connected with the interlocking signal receiving module; the resistance values of the connecting resistors on the branches are different.
Furthermore, a resistance measuring module for measuring the resistance of the parallel circuit or a current measuring module for measuring the current of the parallel circuit is arranged on the interlocking signal sending module or the interlocking signal receiving module, so that automatic measurement is realized, and the timeliness and convenience of fault diagnosis are improved.
The invention relates to a diagnosis method of an electric automobile loop interlocking circuit, which is applied to the electric automobile loop interlocking circuit and specifically comprises the following steps: firstly, measuring or calculating the resistance value or the current value of the parallel circuit when each branch circuit works normally, then monitoring the resistance value or the current value of the parallel circuit in real time, and judging the position of a fault branch circuit according to the change value when the resistance value or the current value of the parallel resistor changes relative to the resistance value or the current value in a normal state.
The principle of the above diagnostic method is as follows: 1/R total =1/R1+1/R2+ … … +1/Rn, wherein R total is the resistance value of the parallel circuit, and R1 and R2 … … Rn are the resistance values of the connecting resistors on the branches; i total = i1+ i2+ … … + in, where i is the current value of the parallel circuit, i1, i2 … … i n are the current values on the respective branches, and in = U/Rn, where U is the voltage difference between the interlock signal issuing module and the interlock signal receiving module and remains unchanged. As can be seen from the above calculation formulas of the resistance value and the current value of the parallel circuit, when the connection resistance of any one branch is shifted out of the parallel circuit, the resistance value and the current value of the parallel circuit are changed. When the interlocking switch on a certain branch is disconnected due to a fault, the fault branch is disconnected, the connecting resistance of the fault branch can be shifted out of the parallel branch, the resistance value and the current value of the parallel circuit can be changed at the moment, and the change value is related to the shifted connecting resistance value, so that the position of the fault branch can be judged according to the change value of the resistance value and the current value of the parallel circuit.
Further, the interlocking signal sending module or the interlocking signal receiving module is connected with the automobile instrument. After detecting certain branch road and breaking down, interlocking signal receiving module generates the fault code that represents trouble branch road, sends a signal in order to light the trouble lamp in the instrument to the instrument simultaneously to in time carry out corresponding processing in the warning driver, and the APP backstage that maintenance personal accessible corresponding diagnostic apparatus or bind with the vehicle inquires the fault code, thereby obtains the concrete position of trouble branch road.
The electric vehicle loop interlocking circuit and the diagnosis method thereof can quickly and accurately lock the fault position, are convenient for maintenance personnel to troubleshoot the fault, effectively reduce the after-sale cost and avoid the safety risk.
Drawings
Fig. 1 is a circuit diagram of a loop interlock circuit of an electric vehicle accessory loop in embodiment 1.
Fig. 2 is a circuit diagram of a loop interlock circuit of the electric vehicle discharge loop in embodiment 1.
Detailed Description
The following describes embodiments of the present invention, such as shapes and structures of respective members, mutual positions and connection relationships between respective portions, and actions and operation principles of the respective portions, in further detail, with reference to the accompanying drawings.
Example 1:
the embodiment provides an electric vehicle loop interlocking circuit and a diagnosis method thereof, which are used for quickly locking a fault point in an electric vehicle loop interlocking protection circuit, so that the maintenance cost is reduced, and the maintenance efficiency is improved.
The electric automobile loop interlocking circuit comprises an interlocking signal sending module, an interlocking signal receiving module, a plurality of interlocking switches for detecting the state of a high-voltage component and connecting resistors with the number corresponding to that of the interlocking switches, wherein the corresponding interlocking switches and the connecting resistors are connected in series to form branches, all the branches are connected in parallel to form a parallel circuit, one end of the parallel circuit is connected with the interlocking signal sending module, and the other end of the parallel circuit is connected with the interlocking signal receiving module; the resistance values of the connecting resistors on the branches are different.
Specifically, the loop interlock circuit of the present embodiment includes an electric vehicle accessory loop and an electric vehicle discharge loop, wherein:
as shown in fig. 1, in the electric vehicle accessory loop, the interlock signal sending module and the interlock signal receiving module are integrated on the vehicle control unit; the device comprises a vehicle controller, a heater, a direct current conversion module, a compressor, a plurality of interlocking switches and a plurality of connecting resistors, wherein the number of the interlocking switches is three, the interlocking switches are respectively used for detecting states of the heater, the direct current conversion module and the compressor, the corresponding connecting resistors are respectively R1, R2 and R3, the vehicle controller is provided with a resistor measuring module used for measuring the parallel circuit resistor, and the vehicle controller is connected with an automobile instrument.
As shown in fig. 2, in the electric vehicle discharging loop, the interlock signal sending module is integrated on the vehicle control unit, and the interlock signal receiving module is integrated on the battery management system; the three interlocking switches are respectively used for detecting the states of the distribution box, the motor controller and the battery, and the corresponding connecting resistors are respectively R4, R5 and R6; the battery management system is respectively connected with the automobile instrument and the high-voltage contactor, and a resistance measurement module for measuring the resistance of the parallel circuit is arranged on the battery management system.
For convenience of explanation, fig. 1 and 2 show only the portions related to the present embodiment.
In the circuit, the resistances of R1 and R4 are both 400 Ω, the resistances of R2 and R5 are both 240 Ω, and the resistances of R3 and R6 are both 200 Ω.
The method for diagnosing the electric vehicle loop interlocking circuit is applied to the two loop interlocking circuits of the electric vehicle, and specifically comprises the following steps: firstly, measuring or calculating the resistance value of the parallel circuit when each branch circuit works normally, then monitoring the resistance value of the parallel circuit in real time, and judging the position of a fault branch circuit according to the change value when the resistance value of the parallel resistor changes relative to the resistance value in a normal state.
The principle of the above diagnostic method is as follows: 1/R total =1/R1+1/R2+1/R3, wherein R total is the resistance value of the parallel circuit, and R1, R2 and R3 are the resistance values of the connecting resistors on the branches; as can be seen from the above calculation formulas of the resistance value and the current value of the parallel circuit, when the connection resistance of any one branch is shifted out of the parallel circuit, the resistance value of the parallel circuit changes. When the interlocking switches on one branch are disconnected due to faults, the fault branch is disconnected, the connecting resistance of the fault branch can be shifted out of the parallel branch, the resistance value of the parallel circuit can be changed at the moment, and the change value is related to the shifted connecting resistance value, so that the position of the fault branch can be judged according to the change value of the resistance value of the parallel circuit.
For example, in the case of an electric vehicle accessory loop, when the vehicle control unit sends an interlock signal, current flows through the heater and the R1, the dc conversion module and the R2, and the compressor and the R3 at the same time, and the vehicle control unit receives the electrical signal and detects the resistance of the parallel circuit. When each branch circuit works normally, the resistance value of the parallel circuit is 86.7 omega, when the interlocking switch of the heater is disconnected, the resistance R1 is equivalently moved out of the parallel circuit, and the resistance value of the parallel circuit is 109.1 omega; when the interlock switch of the direct current conversion module is switched off, the resistor R2 is equivalently moved out of the parallel circuit, and the resistance value of the parallel circuit is 133.3 omega; when the interlock switch of the compressor is turned off, the resistor R3 is equivalent to being moved out of the parallel circuit, and the resistance value of the parallel circuit is 150 omega; when the interlocking switches of the heater and the direct current conversion module are simultaneously switched off, the resistors R1 and R2 are equivalently simultaneously shifted out of the parallel circuit, and the resistance value of the parallel circuit is 200 omega; when the interlocking switches of the heater and the compressor are simultaneously turned off, the resistors R1 and R3 are equivalently simultaneously moved out of the parallel circuit, the resistance value of the parallel circuit is 240 omega, when the interlocking switches of the direct current conversion module and the compressor are simultaneously turned off, the resistors R2 and R3 are equivalently simultaneously moved out of the parallel circuit, and the resistance value of the parallel circuit is 400 omega; when the heater, the dc conversion module and the compressor are turned off at the same time, the resistors R2, R2 and R3 are simultaneously removed from the parallel circuit, and the resistance value of the parallel circuit is ∞ (i.e., equivalent to an open circuit). Therefore, by measuring the resistance value of the entire parallel circuit in the fault state, it is possible to find out which branch has failed by looking up the following table.
The following table is a resistance comparison table of a fault circuit of an electric vehicle accessory loop.
| Fault circuit | Heating device | DC conversion module | Compressor with a compressor housing having a plurality of compressor blades | DC conversion module + compressor | Heater + compressor | Heater + DC conversion module | Accessory all-purpose module |
| Parallel resistance resistor | 109.1Ω | 133.3Ω | 150Ω | 400Ω | 240Ω | 200Ω | ∞ |
After detecting that a certain branch circuit breaks down, vehicle control unit generates the fault code that represents the trouble branch circuit, sends a signal in order to light the trouble lamp in the instrument to the instrument simultaneously to in time carry out corresponding processing in reminding the driver, and maintenance personal accessible corresponding diagnostic instrument or the APP backstage that binds with the vehicle inquire about the fault code, thereby obtain the concrete position of trouble branch circuit.
The fault diagnosis method of the electric vehicle discharge loop is similar to that of the electric vehicle accessory loop, and is not repeated herein, and is different from the electric vehicle accessory loop in that after a certain branch is detected to be in fault, the battery management system further disconnects the high-voltage contactor to execute protection action, so that electric shock risk is avoided.
Of course, the above-mentioned manner of measuring the parallel resistance may be changed to a manner of measuring the total current of the parallel circuit, and since the voltage at the two ends of the parallel circuit is not changed, when the connection resistance of a certain branch is disconnected, the total resistance of the parallel circuit will be changed, and accordingly, the total current of the parallel circuit will also be changed, and the change value of the current is related to the resistance value of the disconnected connection resistance, so that the position of the faulty branch can be determined through the change of the current value.
The invention has been described in connection with the accompanying drawings, it is to be understood that the invention is not limited in its application to the details of construction and the arrangement of the components set forth in the following description, as long as the invention is capable of being practiced without modification in any way whatsoever, and is capable of other applications without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (7)
1. An electric automobile loop interlocking circuit is characterized by comprising an interlocking signal sending module, an interlocking signal receiving module, a plurality of interlocking switches for detecting the state of a high-voltage component and connecting resistors with the number corresponding to that of the interlocking switches, wherein the corresponding interlocking switches and the connecting resistors are connected in series to form branches, all the branches are connected in parallel to form a parallel circuit, one end of the parallel circuit is connected with the interlocking signal sending module, and the other end of the parallel circuit is connected with the interlocking signal receiving module; the resistance values of the connecting resistors on the branches are different.
2. The electric automobile loop interlock circuit according to claim 1, wherein the interlock signal sending module or the interlock signal receiving module is provided with a resistance measuring module for measuring the resistance of the parallel circuit or a current measuring module for measuring the current of the parallel circuit.
3. The electric vehicle loop interlock circuit according to claim 1 or 2, wherein the interlock signal emitting module or the interlock signal receiving module is connected to a vehicle meter.
4. The electric vehicle loop interlock circuit according to claim 1 or 2, wherein the interlock signal sending module and the interlock signal receiving module are integrated on a vehicle control unit; the interlocking switches are three and are respectively used for detecting the states of the heater, the direct current conversion module and the compressor.
5. The electric vehicle loop interlock circuit according to claim 1 or 2, wherein the interlock signal sending module is integrated on a vehicle control unit, and the interlock signal receiving module is integrated on a battery management system; the number of the interlocking switches is three, and the interlocking switches are respectively used for detecting the states of the distribution box, the motor controller and the battery; the battery management system is connected with the high-voltage contactor.
6. A diagnostic method of an electric vehicle loop interlock circuit, which is applied to the electric vehicle loop interlock circuit according to claim 2, is characterized by comprising the following steps: firstly, measuring or calculating the resistance value or the current value of the parallel circuit when each branch circuit works normally, then monitoring the resistance value or the current value of the parallel circuit in real time, and judging the position of a fault branch circuit according to the change value when the resistance value or the current value of the parallel resistor changes relative to the resistance value or the current value in a normal state.
7. The method as claimed in claim 6, wherein the interlock signal receiving module generates a fault code representing a faulty branch after detecting a fault in a branch, and sends a signal to the meter to turn on a faulty lamp in the meter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010207744.6A CN111422068A (en) | 2020-03-23 | 2020-03-23 | Electric vehicle loop interlocking circuit and diagnosis method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010207744.6A CN111422068A (en) | 2020-03-23 | 2020-03-23 | Electric vehicle loop interlocking circuit and diagnosis method thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112213624A (en) * | 2020-09-29 | 2021-01-12 | 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 |
| CN112379311A (en) * | 2020-09-29 | 2021-02-19 | 许继电源有限公司 | Connection confirmation detection system and detection method for shore power connector |
| CN112721645A (en) * | 2021-01-28 | 2021-04-30 | 上海汽车集团股份有限公司 | High-voltage interlocking detection circuit and detection method for electric automobile |
| CN112776606A (en) * | 2021-02-22 | 2021-05-11 | 北京汽车集团越野车有限公司 | High-voltage interlocking loop and detection method and device thereof |
| CN113917368A (en) * | 2021-09-28 | 2022-01-11 | 潍柴动力股份有限公司 | High-voltage interlocking detection circuit, method and device |
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| CN106926705A (en) * | 2017-04-21 | 2017-07-07 | 阿尔特汽车技术股份有限公司 | Electric automobile high-voltage mutual interlocking gear |
| US20170307674A1 (en) * | 2014-09-24 | 2017-10-26 | Conti Temic Microelectronic Gmbh | Circuit Apparatus And Method For Detecting A State Of An Interlock Loop |
| CN108058599A (en) * | 2017-12-14 | 2018-05-22 | 重庆长安汽车股份有限公司 | A kind of automobile and its high-voltage interlocking detection circuit |
| CN209505473U (en) * | 2019-01-31 | 2019-10-18 | 北京新能源汽车股份有限公司 | High-voltage interlocking detection circuit and electric automobile |
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2020
- 2020-03-23 CN CN202010207744.6A patent/CN111422068A/en active Pending
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| US20170307674A1 (en) * | 2014-09-24 | 2017-10-26 | Conti Temic Microelectronic Gmbh | Circuit Apparatus And Method For Detecting A State Of An Interlock Loop |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112213624A (en) * | 2020-09-29 | 2021-01-12 | 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 |
| CN112379311A (en) * | 2020-09-29 | 2021-02-19 | 许继电源有限公司 | Connection confirmation detection system and detection method for shore power connector |
| 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 |
| CN112721645A (en) * | 2021-01-28 | 2021-04-30 | 上海汽车集团股份有限公司 | High-voltage interlocking detection circuit and detection method for electric automobile |
| CN112776606A (en) * | 2021-02-22 | 2021-05-11 | 北京汽车集团越野车有限公司 | High-voltage interlocking loop and detection method and device thereof |
| CN113917368A (en) * | 2021-09-28 | 2022-01-11 | 潍柴动力股份有限公司 | High-voltage interlocking detection circuit, method and device |
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Application publication date: 20200717 |