CN111157866A - Distributed insulation detection system and method for new energy vehicle - Google Patents
Distributed insulation detection system and method for new energy vehicle Download PDFInfo
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- CN111157866A CN111157866A CN202010127010.7A CN202010127010A CN111157866A CN 111157866 A CN111157866 A CN 111157866A CN 202010127010 A CN202010127010 A CN 202010127010A CN 111157866 A CN111157866 A CN 111157866A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/14—Circuits therefor, e.g. for generating test voltages, sensing circuits
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/025—Measuring very high resistances, e.g. isolation resistances, i.e. megohm-meters
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Abstract
The invention discloses a distributed insulation detection system and a distributed insulation detection method for a new energy vehicle, wherein the system comprises a control module, an insulation detection module, a relay and a relay controller, a power distribution circuit comprises a power supply branch and three parallel branches, two ends of the power supply branch are respectively connected with a power battery and the three parallel branches, the three parallel branches are connected with a load through the relay, the insulation detection module is arranged in the power supply branch, a control end of the relay controller is connected with the relay in the three parallel branches, and the control module is connected with the insulation detection module and the relay controller. The method comprises the steps of detecting the insulation resistance of different loops by controlling the relay and insulation detection through different instructions, and then carrying out comparison, rechecking and the like on the insulation resistance to carry out insulation fault positioning. Under the premise of ensuring the functions and the performance of the whole vehicle, the problem that the insulation of each branch cannot be detected before power-on is solved, and the problem can be accurately and quickly positioned after an insulation fault occurs, so that the problem can be timely eliminated.
Description
Technical Field
The invention relates to a distributed insulation detection system and method for a new energy vehicle, and belongs to the technical field of vehicle detection.
Background
Along with the continuous popularization of new energy vehicles, energy storage device and drive arrangement on the new energy vehicle are high voltage platform at present, if the vehicle takes place the electric leakage, can cause direct injury to the human body, consequently also increasingly high to the requirement of insulating detection.
The existing insulation monitoring is carried out at a battery end, the insulation conditions of a rear end and each part cannot be detected before high-voltage electrification, and after insulation problems occur, only one-by-one manual measurement can be carried out by adopting an insulation measuring tool; if the high voltage is directly electrified at the moment, if the rear end load component or the connecting component has insulation problems, the component can be damaged irreparably; even the whole vehicle is electrified, causing unpredictable damage to human bodies.
The current insulation detection based on vehicles mainly has the following defects: the insulation problem of the following electrical components cannot be predicted before the vehicle is powered on at high voltage; when insulation problems actually occur, insulation detection must be carried out one by one, the operation is complex, the requirement on the quality of maintainers is high, and electric shock risks exist; the insulation measurement for vehicles is different from the insulation monitoring mode of a common insulation measuring tool in the market, so that the error is large, and the problem point is more complicated and uncontrollable to search.
Disclosure of Invention
In order to solve the problems, the invention provides a distributed insulation detection system and a distributed insulation detection method for a new energy vehicle, which can solve the problem that the insulation of each branch cannot be detected before the whole vehicle is powered on the premise of ensuring the function and the performance of the whole vehicle, and can accurately and quickly locate the problem point after an insulation fault occurs, thereby ensuring that the problem is timely checked and solved.
The technical scheme adopted for solving the technical problems is as follows:
on one hand, the distributed insulation detection system of the new energy vehicle provided by the embodiment of the invention is used for carrying out insulation detection on a distribution circuit in a high-voltage distribution box, and the system comprises: control module, insulating detection module, relay and relay controller, distribution circuit includes power branch road and three parallelly connected branch road, power branch road one end links to each other with power battery, and the other end links to each other with three parallelly connected branch road respectively, three parallelly connected branch road links to each other with the load respectively, insulating detection module sets up in the power branch road, all is provided with the relay in the three parallelly connected branch road, relay controller's control end links to each other with the relay in the three parallelly connected branch road, control module links to each other with insulating detection module and relay controller respectively.
As a possible implementation manner of this embodiment, the positive and negative pole circuits of the power branch are both provided with a relay connected to the relay controller.
As a possible implementation manner of this embodiment, relays are disposed in the positive and negative electrode circuits in the three parallel branches.
As a possible implementation manner of this embodiment, pre-charging resistors are disposed in the three parallel branches, and the pre-charging resistors are connected in parallel with the relay switches in the corresponding parallel branches.
As a possible implementation manner of this embodiment, pre-charging resistors are disposed in two of the three parallel branches.
On the other hand, the distributed insulation detection method for the new energy vehicle provided by the embodiment of the invention comprises the following steps:
carrying out insulation detection on a loop where an insulation detection point is located;
carrying out insulation detection on front and rear end branches of a loop where an insulation detection point is located;
and confirming and detecting a loop of which the insulation resistance is lower than an alarm value in the insulation detection process of the front and rear end branches.
As a possible implementation manner of this embodiment, in the process of performing insulation detection on a loop where an insulation detection point is located, if it is detected that the insulation resistance of the loop is lower than a normal value, processing needs to be performed in time until the insulation resistance is higher than a set alarm value, and then detection at the next stage can be performed.
As a possible implementation manner of this embodiment, in the process of performing insulation detection on front and rear end branches of a loop where an insulation detection point is located, a positive circuit and a negative circuit are respectively detected on each branch.
As a possible implementation manner of this embodiment, in the process of performing insulation detection on front and rear end branches of a loop where an insulation detection point is located, insulation detection is performed in a polling detection manner, and a serial number and an insulation resistance of each branch are recorded during detection.
As a possible implementation manner of this embodiment, in the process of performing insulation detection on front and rear end branches of a loop where an insulation detection point is located, when a fault is detected in one loop, detection of a subsequent loop is not stopped, but a branch serial number and an insulation resistance are recorded and an identifier is added for a branch lower than an alarm value.
As a possible implementation manner of this embodiment, in the process of performing insulation detection on front and rear end branches of a loop where an insulation detection point is located, after all loops are detected, a minimum insulation resistance is obtained through comparison and recording, and an initial alarm is performed on a branch which is lower than an alarm value in polling detection, which indicates that the branch may have an insulation problem;
as a possible implementation manner of this embodiment, in the process of performing the confirmation detection, the insulation resistance of the confirmation detection is compared with the alarm set value, if the insulation resistance of both stages is lower than the alarm set value, it is determined that the branch has a problem, the fault is locked, and the alarm confirmation is performed; otherwise, a third detection is needed, and the final result is based on the results of two detections in the three detections.
The technical scheme of the embodiment of the invention has the following beneficial effects:
on the premise of ensuring the function and performance of the whole vehicle, the invention can solve the problem that the insulation of each branch cannot be detected before power-on, and can accurately and quickly locate the problem point after the insulation fault occurs, thereby ensuring the timely troubleshooting and solving the problem.
The distributed insulation detection of the vehicle is realized based on the high-voltage distribution framework of the vehicle, the insulation problem of each branch of the vehicle can be detected before the vehicle runs, the problem is found in advance, and the damage of the vehicle or other damages caused by the insulation problem is avoided; the precise location of the insulation fault can also be carried out after the vehicle actually has insulation problems.
Description of the drawings:
FIG. 1 is a block diagram of a distributed insulation detection system for a new energy vehicle, according to an exemplary embodiment;
FIG. 2 is a flow chart illustrating a distributed insulation detection method for a new energy vehicle according to an exemplary embodiment;
in fig. 1, K1, K2, K3, K4, K5, K6, K7, K8, and K9 are relays; lka and LKb are switches; a. b is a detection point, and R1 and R2 are precharge resistors.
Detailed Description
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
in order to clearly explain the technical features of the present invention, the following detailed description of the present invention is provided with reference to the accompanying drawings. The following disclosure provides many different embodiments, or examples, for implementing different features of the invention. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. It should be noted that the components illustrated in the figures are not necessarily drawn to scale. Descriptions of well-known components and processing techniques and procedures are omitted so as to not unnecessarily limit the invention.
Fig. 1 is a block diagram illustrating a distributed insulation detection system of a new energy vehicle according to an exemplary embodiment. Fig. 1 embodies the high voltage components, control components, and high voltage distribution architecture and schematic corresponding to the control scheme associated with the present invention. The power battery is a finished automobile energy storage device and provides a direct-current high-voltage source for finished automobile components; the driving motor is a driving system of the vehicle and provides power for the whole vehicle; the three-in-one is a vehicle accessory driving controller; defrosting is a resistive load, representing a resistive load on the vehicle; the control module is a control system of the vehicle and is responsible for multiple functions of high-voltage power supply and power off, driving, assisting and the like of the vehicle, wherein the control method is integrated in the control module. In the figure, a dotted line frame part is the content of the system described in the patent, and a power battery, a driving motor, a three-in-one unit, defrosting and the like are peripheral related components and form a high-voltage framework diagram on a vehicle together with a high-voltage distribution box; the solid line frame in the dotted line frame represents a schematic diagram inside the high-voltage distribution box and is composed of a relay, a pre-charging resistor, an insulation monitoring module, a relay controller and the like.
As shown in fig. 1, a distributed insulation detection system for a new energy vehicle according to an embodiment of the present invention is used for performing insulation detection on a distribution circuit in a high voltage distribution box, and the system includes: control module, insulating detection module, relay and relay controller, distribution circuit includes power branch road and three parallelly connected branch road, power branch road one end links to each other with power battery, and the other end links to each other with three parallelly connected branch road respectively, three parallelly connected branch road links to each other with the load respectively, insulating detection module sets up in the power branch road, all is provided with the relay in the three parallelly connected branch road, relay controller's control end links to each other with the relay in the three parallelly connected branch road, control module links to each other with insulating detection module and relay controller respectively.
As a possible implementation manner of this embodiment, the positive and negative pole circuits of the power branch are both provided with a relay connected to the relay controller.
As a possible implementation manner of this embodiment, relays are disposed in the positive and negative electrode circuits in the three parallel branches.
As a possible implementation manner of this embodiment, pre-charging resistors are disposed in the three parallel branches, and the pre-charging resistors are connected in parallel with the relay switches in the corresponding parallel branches.
As a possible implementation manner of this embodiment, pre-charging resistors are disposed in two of the three parallel branches.
Under the premise of ensuring the functions and the performance of the whole vehicle, the problem that the insulation of each branch cannot be detected before power-on can be solved, and meanwhile, the problem can be accurately and quickly positioned after an insulation fault occurs, so that the problem can be timely checked and solved.
Fig. 2 is a flowchart illustrating a distributed insulation detection method for a new energy vehicle according to an exemplary embodiment. As shown in fig. 2, a distributed insulation detection method for a new energy vehicle according to an embodiment of the present invention includes:
carrying out insulation detection on a loop where an insulation detection point is located;
carrying out insulation detection on front and rear end branches of a loop where an insulation detection point is located;
and confirming and detecting a loop of which the insulation resistance is lower than an alarm value in the insulation detection process of the front and rear end branches.
As a possible implementation manner of this embodiment, in the process of performing insulation detection on a loop where an insulation detection point is located, if it is detected that the insulation resistance of the loop is lower than a normal value, processing needs to be performed in time until the insulation resistance is higher than a set alarm value, and then detection at the next stage can be performed.
As a possible implementation manner of this embodiment, in the process of performing insulation detection on front and rear end branches of a loop where an insulation detection point is located, a positive circuit and a negative circuit are respectively detected on each branch.
As a possible implementation manner of this embodiment, in the process of performing insulation detection on front and rear end branches of a loop where an insulation detection point is located, insulation detection is performed in a polling detection manner, and a serial number and an insulation resistance of each branch are recorded during detection.
As a possible implementation manner of this embodiment, in the process of performing insulation detection on front and rear end branches of a loop where an insulation detection point is located, when a fault is detected in one loop, detection of a subsequent loop is not stopped, but a branch serial number and an insulation resistance are recorded and an identifier is added for a branch lower than an alarm value.
As a possible implementation manner of this embodiment, in the process of performing insulation detection on front and rear end branches of a loop where an insulation detection point is located, after all loops are detected, a minimum insulation resistance is obtained through comparison and recording, and an initial alarm is performed on a branch which is lower than an alarm value in polling detection, which indicates that the branch may have an insulation problem;
as a possible implementation manner of this embodiment, in the process of performing the confirmation detection, the insulation resistance of the confirmation detection is compared with the alarm set value, if the insulation resistance of both stages is lower than the alarm set value, it is determined that the branch has a problem, the fault is locked, and the alarm confirmation is performed; otherwise, a third detection is needed, and the final result is based on the results of two detections in the three detections.
Fig. 2 is an insulation monitoring control flow chart, which mainly describes the detection timing, detection mode and insulation fault determination method of the whole insulation detection system by the control module in the insulation monitoring system. The invention provides a distributed insulation detection system of a new energy vehicle (pure electric, hybrid power and fuel cell), which comprises a power cell branch, a load branch, branch relays, a pre-charging resistor, an insulation detection module, an insulation detection point, an insulation detection branch switch, a relay controller, a control module and the like. The control module is internally provided with an insulation detection control algorithm and sends different instructions to the insulation detection module and the relay controller through the CAN bus to realize insulation detection of different loops, and then the insulation resistance of the whole vehicle and the positioning of a fault branch are realized through comparison of insulation resistance of each loop and rechecking of a low-resistance loop. The invention effectively improves the inspection efficiency of the insulation problem of the vehicle and simultaneously avoids the defect that the rear-end branch cannot be detected before the whole vehicle is electrified at high voltage.
As shown in fig. 1 and 2, a specific process of insulation monitoring using the present invention is as follows.
Firstly, the front end of a detection point a is connected with the positive pole of a power battery through a relay K1, the rear end of the detection point a is divided into three branches, the positive pole of a driving motor branch is connected with a pre-charging resistor R1 through a relay K4, a relay K5, the positive pole of a three-in-one branch is connected with a pre-charging resistor R2 through a relay K7, a relay K8, and the positive pole of a defrosting branch is connected with a relay K2; the detection point b is connected with the cathode of the power battery through a relay K3, three branches at the rear end of the detection point b correspond to the anode and are respectively connected with the cathode of the driving motor branch, the cathode of the three-in-one branch and the cathode of the defrosting branch through a relay K6, a relay K9 and a copper bar; the insulation monitoring module is connected with the detection point a through a switch Lka and connected with the detection point b through a switch LKb; the relay controller controls the on-off of each relay; the control module realizes the control function of the insulation detection module and the relay controller through the CAN bus, simultaneously the insulation detection module and the relay controller send the insulation resistance values of all branches, the state of the insulation detection module and the state of the relay feedback to the control module through the CAN bus, and the control module further processes the data through the algorithm of the control module.
Secondly, the whole insulation monitoring control process can be divided into three stages, and safety and accuracy of insulation detection of each branch of the vehicle can be realized through the three stages.
The first stage is as follows: when an external control module, an insulation detection module and a relay controller in the system start to work, insulation resistance detection is started, namely, in an initial detection stage, a loop where an insulation detection working point is located is detected at first, and the initial detection is a guarantee of accurate follow-up detection. If the insulation detection module detects that the insulation resistance of the loop is lower than a normal value at the moment, the loop needs to be processed in time, the detection of the next stage can be carried out until the insulation resistance of the two loops is higher than a set alarm value, and meanwhile, the short circuit condition is prevented from occurring when the power battery branch circuit detection is carried out in order to ensure the safety of the vehicle and each component. The insulation resistance also accords with ohm law, the more the branches are connected in parallel, the smaller the resistance is, the detection of the latter branch also contains the loop, so the insulation resistance is certainly lower than the loop, and the detection value has no reference significance for the insulation resistance values detected by other rear-end and front-end branches. But the value of the branch detection does not affect the detection of the next stage.
And a second stage: and (3) carrying out insulation monitoring on front and rear end branches of a loop where the detection point is located, and respectively carrying out detection on the positive loop and the negative loop, wherein the detection at the stage is a polling detection mode, and the serial number and the insulation resistance of each branch are recorded during detection. When a loop is detected to have a fault, the detection of the following loop is not stopped, because the insulation detection branches at the stage are independent branches and do not interfere with each other, but the serial number and the insulation resistance of the branch lower than the alarm value are recorded and added with marks, so that the confirmatory detection at the third stage is facilitated. After all loops are detected, the minimum insulation resistance is obtained through recording and comparison, and initial alarm is carried out on the branch which is lower than the alarm value in polling detection, so that the branch possibly has an insulation problem;
and a third stage: in order to ensure the accuracy of insulation detection, a loop of which the insulation resistance is lower than an alarm value in the second stage needs to be confirmed and detected, after the detection is finished, the insulation resistance detected in the third stage is firstly compared with an alarm set value, if the insulation resistance in the two stages is lower than the alarm set value, the branch is determined to have a problem, the fault is locked, and alarm confirmation is carried out; otherwise, a third detection is needed, and the final result is based on the results of two detections in the three detections.
The invention carries out the opening and closing operation of different time sequences on each relay through the relay controller in the high-voltage distribution box, and simultaneously sends different detection modes to the insulation detection module through the CAN bus; the relay controller and the insulation detection module receive the instruction sent by the control module through the CAN bus, then execute the instruction, finally feed back the executed result or state to the control module through the CAN bus, and the algorithm pre-programmed by the control module CAN determine the next step of execution according to the feedback information until the insulation detection is finished, and then carry out the next round of detection. And finally, determining whether the vehicle has an insulation fault problem or not by detecting the insulation resistance of each branch, and directly positioning the insulation fault point of the vehicle if the vehicle has the insulation fault.
The foregoing is only a preferred embodiment of the present invention, and it will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and these modifications and improvements are also considered to be within the scope of the present invention.
Claims (10)
1. The utility model provides an insulating detecting system of distribution of new forms of energy vehicle for carry out insulating detection to distribution circuit in the high voltage distribution box, characterized by includes: control module, insulating detection module, relay and relay controller, distribution circuit includes power branch road and three parallelly connected branch road, power branch road one end links to each other with power battery, and the other end links to each other with three parallelly connected branch road respectively, three parallelly connected branch road links to each other with the load respectively, insulating detection module sets up in the power branch road, all is provided with the relay in the three parallelly connected branch road, relay controller's control end links to each other with the relay in the three parallelly connected branch road, control module links to each other with insulating detection module and relay controller respectively.
2. The distributed insulation detection system of the new energy vehicle as claimed in claim 1, wherein a relay connected to the relay controller is arranged in each of the positive and negative electrode circuits of the power branch.
3. The distributed insulation detection system of the new energy vehicle as claimed in claim 1, wherein relays are arranged in the positive and negative circuits of the three parallel branches.
4. The distributed insulation detection system of the new energy vehicle as claimed in claim 1, wherein pre-charging resistors are arranged in the three parallel branches, and the pre-charging resistors are connected in parallel with relay switches in the corresponding parallel branches.
5. The distributed insulation detection system of the new energy vehicle as claimed in claim 4, wherein pre-charging resistors are arranged in two of the three parallel branches.
6. A distributed insulation detection method for a new energy vehicle is characterized by comprising the following steps:
carrying out insulation detection on a loop where an insulation detection point is located;
carrying out insulation detection on front and rear end branches of a loop where an insulation detection point is located;
and confirming and detecting a loop of which the insulation resistance is lower than an alarm value in the insulation detection process of the front and rear end branches.
7. The distributed insulation detection method for the new energy vehicle as claimed in claim 6, wherein in the process of performing insulation detection on the loop where the insulation detection point is located, if the insulation resistance of the loop is detected to be lower than a normal value, the process is required to be performed in time until the insulation resistance is higher than a set alarm value, and then the next stage of detection can be performed.
8. The distributed insulation detection method for the new energy vehicle as claimed in claim 6, wherein in the process of performing insulation detection on the branches at the front end and the rear end of the loop where the insulation detection point is located, the detection is performed on a positive pole loop and a negative pole loop of each branch respectively.
9. The distributed insulation detection method for the new energy vehicle as claimed in claim 6, wherein in the process of performing insulation detection on the front and rear branches of the loop where the insulation detection point is located, when all loops are detected, the minimum insulation resistance is obtained through comparison and recording, and an initial alarm is performed on the branch which is lower than the alarm value in polling detection, so that the branch is indicated to have the possibility of insulation problems.
10. The distributed insulation detection method of the new energy vehicle as claimed in claim 6, wherein in the process of performing the confirmation detection, the insulation resistance of the confirmation detection is compared with the alarm set value, if the insulation resistance of the two stages is lower than the alarm set value, the branch is determined to have a problem, the fault is locked, and the alarm confirmation is performed; otherwise, a third detection is needed, and the final result is based on the results of two detections in the three detections.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010127010.7A CN111157866A (en) | 2020-02-27 | 2020-02-27 | Distributed insulation detection system and method for new energy vehicle |
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| CN202010127010.7A CN111157866A (en) | 2020-02-27 | 2020-02-27 | Distributed insulation detection system and method for new energy vehicle |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112060909A (en) * | 2020-08-12 | 2020-12-11 | 华人运通(江苏)技术有限公司 | Vehicle control method and system based on insulation detection |
| CN115718223A (en) * | 2021-08-24 | 2023-02-28 | 宇通客车股份有限公司 | New energy automobile insulation failure positioning method and vehicle |
-
2020
- 2020-02-27 CN CN202010127010.7A patent/CN111157866A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112060909A (en) * | 2020-08-12 | 2020-12-11 | 华人运通(江苏)技术有限公司 | Vehicle control method and system based on insulation detection |
| CN112060909B (en) * | 2020-08-12 | 2022-05-17 | 华人运通(江苏)技术有限公司 | Vehicle control method and system based on insulation detection |
| CN115718223A (en) * | 2021-08-24 | 2023-02-28 | 宇通客车股份有限公司 | New energy automobile insulation failure positioning method and vehicle |
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