CN110696622A - Anti-interference PWM high-voltage interlocking signal detection and compensation control method for electric vehicle - Google Patents
Anti-interference PWM high-voltage interlocking signal detection and compensation control method for electric vehicle Download PDFInfo
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- CN110696622A CN110696622A CN201911020364.5A CN201911020364A CN110696622A CN 110696622 A CN110696622 A CN 110696622A CN 201911020364 A CN201911020364 A CN 201911020364A CN 110696622 A CN110696622 A CN 110696622A
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
- B60R16/023—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for transmission of signals between vehicle parts or subsystems
- B60R16/0231—Circuits relating to the driving or the functioning of the vehicle
- B60R16/0232—Circuits relating to the driving or the functioning of the vehicle for measuring vehicle parameters and indicating critical, abnormal or dangerous conditions
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- Transportation (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The invention discloses an electric automobile anti-interference PWM high-voltage interlocking signal detection and compensation control method, wherein high-voltage components are sequentially connected in series through a low-voltage wire harness to form a closed loop, and the high-voltage component of any node monitors a high-voltage interlocking signal issued by the previous node and outputs the high-voltage interlocking signal with the same frequency to the next node; when the HVIL signal frequency detected by the high-voltage component of a certain node is abnormal, the frequency is reported to the VCU immediately, and the VCU immediately turns off the high-voltage output of the whole vehicle. The high-voltage interlocking signal is a PWM signal with a fixed frequency duty ratio, has strong anti-jamming capability and can be effectively detected; the invention compensates HVIL signal, effectively inhibits signal interference, and is beneficial to detecting a lower-level interlocking unit; according to the invention, each high-voltage component is directly communicated with the vehicle control unit, and when a fault occurs, related safety actions are executed at the first time, so that the vehicle control system is safer and more efficient; the position of each high-voltage component in the series closed loop is unique, and the position of a high-voltage fault can be accurately positioned.
Description
Technical Field
The invention relates to the field of automobile high-voltage interlocking, in particular to an anti-interference PWM high-voltage interlocking signal detection and compensation control method for an electric automobile.
Background
With the gradual deterioration of global climate, the aggravation of urban atmospheric pollution and the excessive consumption of petroleum resources, the development of energy-saving and environment-friendly new energy electric automobiles becomes an important direction of technical innovation of the automobile industry in the world and a necessary choice for the sustainable development of the automobile industry. The high-voltage system of the electric automobile is an insulated and closed system, but under the conditions of vehicle maintenance and some special environments, if high-voltage electric equipment and a high-voltage connector thereof are not normally connected, high voltage exposure can be caused, and the safety problem of electric shock of maintenance personnel is caused. The high-voltage interlocking function monitors the connection state of a vehicle high-voltage system, processes faults in abnormal states, and can cut off the high-voltage output of the power battery by controlling the relay to be disconnected, so that the safety of the electric automobile is improved.
The high-voltage interlocking loop is a low-voltage wiring harness designed in a high-voltage system loop of the electric automobile, and the low-voltage wiring harness connects a power battery and a connector, a pressure touch switch and a maintenance switch of high-voltage electric equipment in series to form a loop. In order to ensure the reliability of the high-voltage interlocking function and avoid that the high-voltage interlocking circuit fails to be found, the designed high-voltage interlocking circuit has fault diagnosis.
Patent document 1 (CN 205097957U) discloses an electric vehicle high-voltage interlock implementing apparatus, which detects whether a high-voltage interlock signal on a high-voltage interlock circuit is at a normal level by each component, determines whether the high-voltage interlock circuit has a fault, and confirms the fault position. The battery management system controller BMS is used as a first control node, and the vehicle control unit VMS is used as a main controller. When a high-voltage interlocking fault occurs, the vehicle control unit controls the BMS to make corresponding actions.
In the prior art, each high-voltage component is independently used as a loop, the level state of a high-voltage interlocking signal is detected, whether a high-voltage interlocking fault occurs or not is judged and confirmed, and the fault position is confirmed. According to the scheme, the interlocking signals are issued in a level mode and are easy to interfere, the vehicle control unit only issues the interlocking signals to the BMS, and other high-voltage components passively execute related actions.
Disclosure of Invention
The invention aims to: the method for detecting and compensating the anti-interference PWM high-voltage interlocking signal of the electric automobile is provided, so that the signal interference is effectively inhibited, and the detection of a lower-level interlocking unit is facilitated.
The technical scheme of the invention is as follows:
the high-voltage component of any node monitors the high-voltage interlocking signal sent by the previous node and outputs the high-voltage interlocking signal with the same frequency to the next node; when the HVIL signal frequency detected by the high-voltage component of a certain node is abnormal, the frequency is reported to the VCU immediately, and the VCU immediately turns off the high-voltage output of the whole vehicle.
Preferably, the VCU locates a specific node location where the fault occurs according to the node reporting the fault.
Preferably, each high voltage component is uniquely located in a series closed loop.
Preferably, after the whole vehicle is started, each high-voltage component completes self-checking, sends an HVIL _ TEST _ READY message to the VCU, and the VCU STARTs to send the HVIL _ START message to each high-voltage component after receiving the READY signals of all the high-voltage nodes.
Preferably, after receiving the HVIL _ START message command from the VCU, each high-voltage component sends a PWM high-voltage interlock signal with a fixed frequency duty ratio to the next node, and the high-voltage component of the next node receives the signal sent by the high-voltage component of the previous node and calculates the frequency of the signal in real time. And if the frequency accords with an expected value, reporting the VCU through the CAN network, wherein the node is normal, otherwise, reporting the high-voltage interlocking abnormality of the node.
Preferably, the high voltage interlock signal is received and issued node by node until it returns to the first high voltage component, forming a closed loop.
Preferably, after receiving the high-voltage interlocking signal abnormal message of any high-voltage component, the VCU sends out a warning power reduction or immediately issues a high-voltage shutdown instruction according to the current running state of the vehicle, and shuts down the high voltage of the whole vehicle.
The invention has the advantages that:
1. the high-voltage interlocking signal is a PWM signal with a fixed frequency duty ratio, has strong anti-jamming capability and can be effectively detected;
2. the invention compensates HVIL signal, effectively inhibits signal interference, and is beneficial to detecting a lower-level interlocking unit;
3. according to the invention, each high-voltage component is directly communicated with the vehicle control unit, and when a fault occurs, related safety actions are executed at the first time, so that the vehicle control system is safer and more efficient;
4. the VCU of the invention positions the specific node position of the fault according to the reported fault node, and the position of each high-voltage component in the series closed loop is unique, thus being capable of accurately positioning the position of the fault.
Drawings
The invention is further described with reference to the following figures and examples:
FIG. 1 is a schematic diagram of detection and compensation control of anti-interference PWM high-voltage interlock signals of an electric vehicle;
fig. 2 is a flow chart of the detection and compensation control of the anti-interference PWM high-voltage interlock signal of the electric vehicle.
Detailed Description
As shown in fig. 1, in the method for detecting and compensating the anti-interference PWM high-voltage interlock signal of the electric vehicle according to the present embodiment, n high-voltage components are sequentially connected in series through a low-voltage wire harness to form a closed loop, and the high-voltage component of any node monitors the high-voltage interlock signal HVIL issued by the previous node and outputs the high-voltage interlock signal of the same frequency to the next node; when the HVIL signal frequency detected by the high-voltage component of a certain node is abnormal, the frequency is reported to the VCU immediately through the CAN, and the VCU immediately turns off the high-voltage output of the whole vehicle. And the VCU positions the specific node position of the fault according to the node reporting the fault. Each high voltage component has a unique position in the series closed loop.
As shown in fig. 2, the process of the method for detecting and compensating the anti-interference PWM high-voltage interlock signal of the electric vehicle according to the present embodiment is as follows.
The high-voltage components are connected in series to form a closed loop through a low-voltage wire harness. After the whole vehicle is started, each high-voltage component completes self-checking, sends an HVIL _ TEST _ READY message to the VCU, and the VCU STARTs to send the HVIL _ START message to each high-voltage component after receiving the READY signals of all the high-voltage nodes.
After receiving an HVIL _ START message instruction of the VCU, each high-voltage component sends a PWM high-voltage interlocking signal with fixed frequency and 50% duty ratio to the next node, and the high-voltage component of the next node receives the signal sent by the high-voltage component of the previous node and calculates the signal frequency in real time. And if the frequency accords with an expected value, reporting the VCU through the CAN network, wherein the node is normal, otherwise, reporting the high-voltage interlocking abnormality of the node. And receiving and sending high-voltage interlocking signals node by node until the high-voltage interlocking signals return to the first high-voltage component to form a closed loop.
And after receiving the high-voltage interlocking signal abnormal message of any high-voltage component, the VCU sends out a warning power reduction or immediately sends out a high-voltage shutdown instruction according to the current running state of the vehicle, and shuts down the high voltage of the whole vehicle.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose of the embodiments is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All modifications made according to the spirit of the main technical scheme of the invention are covered in the protection scope of the invention.
Claims (7)
1. The method for detecting and compensating the anti-interference PWM high-voltage interlocking signal of the electric automobile is characterized in that all high-voltage components are sequentially connected in series through low-voltage wire harnesses to form a closed loop, the high-voltage component of any node monitors the high-voltage interlocking signal issued by the previous node and outputs the high-voltage interlocking signal with the same frequency to the next node; when the HVIL signal frequency detected by the high-voltage component of a certain node is abnormal, the frequency is reported to the VCU immediately, and the VCU immediately turns off the high-voltage output of the whole vehicle.
2. The method according to claim 1, wherein the VCU locates a specific node location where the fault occurs according to the node reporting the fault.
3. The method according to claim 2, wherein each high voltage component has a unique position in the series closed loop.
4. The method as claimed in claim 1, wherein after the whole vehicle is started, each high voltage device completes self-TEST, sends HVIL _ TEST _ READY message to VCU, and after VCU receives READY signal of all high voltage nodes, STARTs sending HVIL _ START message to each high voltage device.
5. The method according to claim 4, wherein each high voltage unit receives the HVIL _ START message command from VCU, and then sends PWM high voltage interlock signal with fixed frequency duty ratio to next node, and the high voltage unit of next node receives the signal sent from the high voltage unit of previous node, and calculates the signal frequency in real time; and if the frequency accords with an expected value, reporting the VCU through the CAN network, wherein the node is normal, otherwise, reporting the high-voltage interlocking abnormality of the node.
6. The method of claim 5, wherein the node-by-node receiving and issuing of the high voltage interlock signal is performed until the first high voltage component is returned to form a closed loop.
7. The method for detecting and compensating the anti-interference PWM high-voltage interlocking signal of the electric vehicle as claimed in claim 6, wherein the VCU sends out a warning power reduction or immediately sends out a high-voltage shutdown instruction to shut down the high voltage of the whole vehicle according to the current running state of the vehicle after receiving the high-voltage interlocking signal abnormal message of any high-voltage component.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911020364.5A CN110696622A (en) | 2019-10-25 | 2019-10-25 | Anti-interference PWM high-voltage interlocking signal detection and compensation control method for electric vehicle |
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| CN201911020364.5A CN110696622A (en) | 2019-10-25 | 2019-10-25 | Anti-interference PWM high-voltage interlocking signal detection and compensation control method for electric vehicle |
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Cited By (3)
| 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 |
| CN112327210A (en) * | 2020-11-06 | 2021-02-05 | 深圳英飞源技术有限公司 | Low-voltage wire harness fault detection circuit and method for energy storage battery system |
| CN113726598A (en) * | 2021-08-20 | 2021-11-30 | 广州小鹏汽车科技有限公司 | Communication method and device and electronic equipment |
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| GB2453025A (en) * | 2007-09-18 | 2009-03-25 | Ford Global Tech Llc | A high voltage interlock system and control strategy |
| CN205097957U (en) * | 2015-10-20 | 2016-03-23 | 上海汽车集团股份有限公司 | Interlocking of electric automobile high pressure realizes device |
| CN205970907U (en) * | 2016-08-23 | 2017-02-22 | 深圳市国新动力科技有限公司 | High reliable power battery high pressure interlocking detecting system |
| CN107042760A (en) * | 2017-02-06 | 2017-08-15 | 潍柴动力股份有限公司 | A kind of electric automobile high-voltage interlock system and its Fault Locating Method |
| CN108790827A (en) * | 2018-05-17 | 2018-11-13 | 铠龙东方汽车有限公司 | A kind of pure electric vehicle vehicle high-voltage interlocking control method |
| CN109017317A (en) * | 2018-08-30 | 2018-12-18 | 深圳市比克动力电池有限公司 | High-voltage interlocking detection circuit and automobile |
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2019
- 2019-10-25 CN CN201911020364.5A patent/CN110696622A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
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| GB2453025A (en) * | 2007-09-18 | 2009-03-25 | Ford Global Tech Llc | A high voltage interlock system and control strategy |
| CN205097957U (en) * | 2015-10-20 | 2016-03-23 | 上海汽车集团股份有限公司 | Interlocking of electric automobile high pressure realizes device |
| CN205970907U (en) * | 2016-08-23 | 2017-02-22 | 深圳市国新动力科技有限公司 | High reliable power battery high pressure interlocking detecting system |
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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 |
| 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 |
| CN112327210A (en) * | 2020-11-06 | 2021-02-05 | 深圳英飞源技术有限公司 | Low-voltage wire harness fault detection circuit and method for energy storage battery system |
| CN113726598A (en) * | 2021-08-20 | 2021-11-30 | 广州小鹏汽车科技有限公司 | Communication method and device and electronic equipment |
| WO2023020458A1 (en) * | 2021-08-20 | 2023-02-23 | 广州小鹏汽车科技有限公司 | Communication method, electronic apparatus, vehicle, and storage medium |
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Application publication date: 20200117 |