CN109444729B - Automobile high-voltage relay diagnosis device and method - Google Patents
Automobile high-voltage relay diagnosis device and method Download PDFInfo
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- CN109444729B CN109444729B CN201811274076.8A CN201811274076A CN109444729B CN 109444729 B CN109444729 B CN 109444729B CN 201811274076 A CN201811274076 A CN 201811274076A CN 109444729 B CN109444729 B CN 109444729B
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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
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3271—Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
- G01R31/3275—Fault detection or status indication
Abstract
The invention discloses a diagnosis device and a diagnosis method for an automobile high-voltage relay, wherein an anode relay in the device is connected with the anode of a battery pack and the anode of a load line, a first acquisition resistor, a first resistor and a switch are connected in parallel at two ends of the battery pack after being sequentially connected, one end of the first acquisition resistor is connected with the cathode of the battery pack, the other end of the first acquisition resistor is set as a first acquisition point, the first end of a second acquisition resistor is connected with the cathode of the battery pack, the second end of the second acquisition resistor is connected with one end of a second resistor, the other end of the second resistor is connected with the anode of the load line, the second end of the second acquisition resistor is set as a second acquisition point, the first acquisition point and the second acquisition point are connected with a control circuit, and the control circuit acquires the voltage of the first acquisition point and the voltage of the second acquisition point. The diagnosis device provided by the invention is used for diagnosing the high-voltage relay, the reference of the sampling voltage is unified to one ground, the possibility of voltage misjudgment is avoided, and the accuracy of the detection result is improved.
Description
Technical Field
The invention relates to the field of automobile battery management, in particular to an automobile high-voltage relay diagnosis device and method.
Background
With the rapid development of new energy vehicles such as electric vehicles and the like, the safety requirement of a direct current driving part is more and more important, the requirement is more and more strict, and the fault diagnosis and detection of a high-voltage relay of a direct current electric energy control unit and related components of the high-voltage relay become more and more important. Currently, relay detection is mainly divided into two types: one type is judged by the state of a relay, the relay is provided with a wiring harness with a feedback contact, and the MCU can detect the level of the wiring harness of the feedback contact to judge; the second type is to judge the state of the relay group by detecting the output voltage of the whole system network, namely whether the voltage of the rear end of the relay is close to the total voltage of the battery.
For one type of judgment method, more relays need to be provided with feedback contacts, so that the complexity of the relays is increased, the safety control and the maintainability of the relays are unfavorable, the requirements on the relays are strict, and the cost of the relays is high. For the second method, the system cannot effectively detect the state of each relay, when a fault occurs, a user can only eliminate and detect each component in the whole network, and the collected voltage is inaccurate due to different collected voltage reference points, especially the floating voltage at the rear end of the relay, so that voltage misjudgment is easily caused.
Disclosure of Invention
The invention aims to provide a device and a method for diagnosing an automobile high-voltage relay, which aim to solve the problems.
In a first aspect, the invention provides an automobile high-voltage relay diagnosis device, which comprises a battery pack, a control circuit, an anode relay, a pre-charge resistor, a cathode relay circuit, a first switch, a first acquisition resistor, a second acquisition resistor, a first resistor and a second resistor, wherein a control end of the anode relay and a control end of the pre-charge relay are connected with the control circuit, the control circuit is used for sending an enable control signal or a break control signal to a relay connected with the control circuit, a load end of the anode relay is connected with an anode of the battery pack and is connected with an anode of a first load line, the cathode relay circuit is connected with a cathode of the battery pack, a load end of the pre-charge relay is connected with the pre-charge resistor in series and then is connected with two ends of the anode relay in parallel, and the first acquisition resistor, The first resistor and the first switch are connected in parallel at two ends of the battery pack after being connected in sequence, one end of the first collecting resistor is connected with the negative electrode of the battery pack, the other end of the first collecting resistor is set as a first collecting point, the first end of the second collecting resistor is connected with the negative electrode of the battery pack, the second end of the second collecting resistor is connected with one end of the second resistor, the other end of the second resistor is connected with the positive electrode of the first load line, the second end of the second collecting resistor is set as a second collecting point, the first collecting point and the second collecting point are connected with the control circuit, and the control circuit is further used for collecting the voltage of the first collecting point and the voltage of the second collecting point.
Optionally, the device further includes a first relay, a third collecting resistor, and a third resistor, where a control end of the first relay is connected to the control circuit, a load end of the first relay is connected to an anode of the battery pack and an anode of a second load line, one end of the third resistor is connected to the anode of the second load line, the other end of the third resistor is connected to a first end of the third collecting resistor, a second end of the third collecting resistor is connected to a cathode of the battery pack according to an enable signal of the control circuit, the first end of the third collecting resistor is set as a third collecting point, the third collecting point is connected to the control circuit, and the control circuit is further configured to collect a voltage of the third collecting point.
Optionally, the negative relay circuit includes a first negative relay, a fourth collecting resistor, a fourth resistor and a fifth resistor, the control terminal of the first negative relay is connected to the control circuit, the load terminal of the first negative relay is connected to the negative terminal of the battery pack and to the negative terminal of a third load line, the first terminal of the fourth collecting resistor is connected to the negative terminal of the battery pack, the second terminal of the fourth collecting resistor is connected to one terminal of the fourth resistor, the other terminal of the fourth resistor is connected to the negative terminal of the third load line, one terminal of the fifth resistor is connected to the negative terminal of the third load line, the other terminal of the fifth resistor is connected to the positive terminal of the battery pack according to the enable signal of the control circuit, the second terminal of the fourth collecting resistor is set as a fourth collecting point, and the fourth collecting point is connected to the control circuit, the control circuit is also used for collecting the voltage of the fourth collecting point.
Optionally, the negative relay circuit includes a second relay, a third relay, a fifth collecting resistor, a sixth resistor, a seventh resistor, an eighth resistor, and a ninth resistor, a control end of the second relay and a control end of the third relay are connected to the control circuit, a load end of the second relay is connected to the negative electrode of the battery pack and to the negative electrode of the fourth load line, a load end of the third relay is connected to the negative electrode of the battery pack and to the negative electrode of the fifth load line, a first end of the fifth collecting resistor is connected to the negative electrode of the battery pack, a second end of the fifth collecting resistor is respectively connected to one end of the sixth resistor and one end of the seventh resistor, the other end of the sixth resistor is connected to the negative electrode of the fourth load line, and the other end of the seventh resistor is connected to the negative electrode of the fifth load line, one end of the eighth resistor is connected with the negative electrode of the fourth load line, one end of the ninth resistor is connected with the negative electrode of the fifth load line, the other end of the eighth resistor and the other end of the ninth resistor are connected with the positive electrode of the battery pack according to an enabling signal of the control circuit, the second end of the fifth collecting resistor is set as a fifth collecting point, the fifth collecting point is connected with the control circuit, and the control circuit is further used for collecting the voltage of the fifth collecting point.
Optionally, the negative relay circuit includes a fourth relay, a fifth relay, a sixth collecting resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, and a thirteenth resistor, a control end of the fourth relay and a control end of the fifth relay are connected to the control circuit, a load end of the fourth relay is connected to the negative electrode of the battery pack and to the negative electrode of a sixth load line, a load end of the fifth relay is connected to one end of the fourth relay, which is far from the negative electrode of the battery pack, and to the negative electrode of a seventh load line, a first end of the sixth collecting resistor is connected to the negative electrode of the battery pack, a second end of the sixth collecting resistor is connected to one end of the tenth resistor and one end of the eleventh resistor, respectively, another end of the tenth resistor is connected to the negative electrode of the sixth load line, and another end of the eleventh resistor is connected to the negative electrode of the seventh load line, one end of the twelfth resistor is connected with the negative electrode of the sixth load line, one end of the thirteenth resistor is connected with the negative electrode of the seventh load line, the other end of the twelfth resistor and the other end of the thirteenth resistor are connected with the positive electrode of the battery pack according to an enabling signal of the control circuit, the second end of the sixth collecting resistor is set as a sixth collecting point, the sixth collecting point is connected with the control circuit, and the control circuit is further used for collecting the voltage of the sixth collecting point.
Optionally, the negative relay circuit includes a second negative relay, a sixth relay, a seventh collecting resistor, an eighth collecting resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, an eighteenth resistor, and a nineteenth resistor, a control end of the second negative relay, a control end of the sixth relay, and a control end of the seventh relay are connected to the control circuit, a load end of the second negative relay is connected to the negative electrode of the battery pack and to the negative electrode of an eighth load line, a first end of the seventh collecting resistor is connected to the negative electrode of the battery pack, a second end of the seventh collecting resistor is connected to one end of the fourteenth resistor, the other end of the fourteenth resistor is connected to the negative electrode of the eighth load line, and one end of the fifteenth resistor is connected to the negative electrode of the eighth load line, the other end of the fifteenth resistor is connected with the anode of the battery pack according to an enabling signal of the control circuit; the load end of the sixth relay is connected with the negative pole of the battery pack and is connected with the negative pole of a ninth load line, the load end of the seventh relay is connected with one end of the sixth relay, which is far away from the negative pole of the battery pack, and is connected with the negative pole of a tenth load line, the first end of the eighth acquisition resistor is connected with the negative pole of the battery pack, the second end of the eighth acquisition resistor is respectively connected with one end of the sixteenth resistor and one end of a seventeenth resistor, the other end of the sixteenth resistor is connected with the negative pole of the ninth load line, the other end of the seventeenth resistor is connected with the negative pole of the tenth load line, one end of the eighteenth resistor is connected with the negative pole of the ninth load line, one end of the nineteenth resistor is connected with the negative pole of the ninth load line, and the other ends of the eighteenth resistor and the nineteenth resistor are connected with the positive pole of the battery pack according to, the second end of the seventh collecting resistor is set as a seventh collecting point, the second end of the eighth collecting resistor is set as an eighth collecting point, the seventh collecting point and the eighth collecting point are connected with the control circuit, and the control circuit is further used for collecting the voltage of the seventh collecting point and the voltage of the eighth collecting point.
Optionally, the negative relay circuit includes a third negative relay, an eighth relay, a ninth collecting resistor, a tenth collecting resistor, a twentieth resistor, a twenty-first resistor, a twenty-second resistor, a twenty-third resistor, a twenty-fourth resistor, and a twenty-fifth resistor, the control end of the third negative relay, the control end of the eighth relay, and the control end of the ninth relay are connected to the control circuit, the load end of the third negative relay is connected to the negative electrode of the battery pack and to the eleventh load line negative electrode, the first end of the ninth collecting resistor is connected to the negative electrode of the battery pack, the second end of the ninth collecting resistor is connected to one end of the twentieth resistor, the other end of the twentieth resistor is connected to the eleventh load line negative electrode, one end of the twenty-first resistor is connected to the eleventh load line negative electrode, the other end of the twenty-first resistor is connected with the anode of the battery pack according to an enabling signal of the control circuit; the load end of the eighth relay is connected with the negative pole of the battery pack and a negative pole of a twelfth load line, the load end of the ninth relay is connected with the negative pole of the battery pack and a negative pole of a thirteenth load line, the first end of the tenth collecting resistor is connected with the negative pole of the battery pack, the second end of the tenth collecting resistor is respectively connected with one end of the twenty-second resistor and one end of the twenty-third resistor, the other end of the twenty-second resistor is connected with the negative pole of the twelfth load line, the other end of the twenty-third resistor is connected with the negative pole of the thirteenth load line, one end of the twenty-fourth resistor is connected with the negative pole of the twelfth load line, the other end of the twenty-fourth resistor and the other end of the twenty-fifth resistor are connected with the positive pole of the battery pack according to the enabling signal of the control circuit, the second end of the ninth collecting resistor is set as a ninth collecting point, the second end of the tenth collecting resistor is set as a tenth collecting point, the ninth collecting point and the tenth collecting point are connected with the control circuit, and the control circuit is further used for collecting the voltage of the ninth collecting point and the voltage of the tenth collecting point.
In a second aspect, the present invention provides a method for diagnosing an automotive high voltage relay, comprising:
the control circuit sends an enabling control signal or a disconnecting control signal to the positive relay;
acquiring voltage values of a first acquisition point and a second acquisition point, and calculating a voltage value of the positive pole of a first load line connected with the positive pole relay and voltage values of two ends of the battery pack according to the voltage value of the first acquisition point and the voltage value of the second acquisition point;
if an enabling control signal is sent to the positive relay, whether the difference value between the voltage value of the positive electrode of the first load line and the voltage values of the two ends of the battery pack is larger than a first preset threshold value or not is judged; if so, determining that the positive relay cannot be closed;
if a disconnection control signal is sent to the positive relay, whether the difference value between the voltage value of the positive electrode of the first load line and the voltage values of the two ends of the battery pack is smaller than a second preset threshold value or not is judged; and if the positive relay is smaller than the preset threshold, determining that the positive relay cannot be disconnected.
Optionally, the control circuit includes a single chip microcomputer and a high-side driving circuit, the high-side driving circuit includes a high-side driving chip, the single chip microcomputer is connected with the high-side driving chip, and the high-side driving chip is connected with the control ends of the plurality of relays, and the method includes:
the single chip microcomputer sends an enabling signal to a high-side driving diagnosis error pin of the high-side driving chip; detecting the port state of the high-side driving diagnosis error pin; and if the output of the high-side driving diagnosis error pin is low level, determining that the high-side driving chip has a fault.
Optionally, the control circuit includes a single chip microcomputer and a high-side driving circuit, the high-side driving circuit includes a high-side driving chip, the single chip microcomputer is connected with the high-side driving chip, and the high-side driving chip is connected with the control ends of the plurality of relays, and the method includes:
the single chip microcomputer collects the voltage of an output channel of the high-side driving chip when a channel enabling pin of the high-side driving chip is not enabled;
if the ratio of the voltage of the output channel to the power voltage provided by the single chip microcomputer to the high-side driving chip is within a first preset ratio range, determining that the positive electrodes of the output channel and the high-side driving chip are short-circuited;
and if the ratio of the voltage of the output channel to the power voltage provided by the singlechip to the high-side driving chip is within a second preset ratio range, determining that the power ground of the output channel and the high-side driving chip is short-circuited.
Optionally, the control circuit includes a single chip microcomputer and a low-side driving circuit, the low-side driving circuit is connected to the single chip microcomputer and to the control end of the low-side relay, the low-side driving circuit includes a low-side driving MOS transistor, and the method includes:
the singlechip acquires the voltage value of the low-side drive relay control pin of the low-side drive circuit when enabling the low-side drive MOS tube control pin of the low-side drive circuit;
if the voltage value of the control pin of the low-side drive relay exceeds a third preset threshold value, determining that the low-side drive MOS tube is abnormal;
the single chip microcomputer collects the voltage value of a low-side drive relay control pin of the low-side drive circuit when the low-side drive MOS tube control pin of the low-side drive circuit is not enabled;
and if the voltage value of the control pin of the low-side drive relay is smaller than a fourth preset threshold value, determining that the low-side drive MOS tube is abnormal.
Compared with the prior art, the diagnosis device and the diagnosis method for the automobile high-voltage relay can diagnose the adhesion condition of the positive relay in the high-voltage relay, the reference of the sampling voltage is unified to the ground, and the condition that the floating voltage at the rear end of the relay is changed does not exist, so that the possibility of misjudgment of the voltage does not exist, the accuracy of the detection result can be effectively improved, and the influence on a system network is reduced.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, alternative embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic circuit diagram of an automotive high voltage relay diagnostic device provided by the present invention;
FIG. 2 is another schematic circuit diagram of the automotive high voltage relay diagnostic device provided by the present invention;
FIG. 3 is another schematic circuit diagram of the automotive high voltage relay diagnostic device provided by the present invention;
FIG. 4 is another schematic circuit diagram of the automotive high voltage relay diagnostic device provided by the present invention;
FIG. 5 is another schematic circuit diagram of the automotive high voltage relay diagnostic device provided by the present invention;
FIG. 6 is another schematic circuit diagram of the automotive high voltage relay diagnostic device provided by the present invention;
FIG. 7 is another circuit schematic diagram of the automotive high voltage relay diagnostic device provided by the present invention;
FIG. 8 is another schematic circuit diagram of the automotive high voltage relay diagnostic device provided by the present invention;
FIG. 9 is a flow chart illustrating a method for diagnosing a high voltage relay of an automobile according to the present invention;
FIG. 10 is another flow chart of the method for diagnosing a high voltage relay of an automobile provided by the present invention;
FIG. 11 is another flow chart of the method for diagnosing a high voltage relay of an automobile provided by the present invention;
FIG. 12 shows a circuit diagram of a low side driver circuit;
fig. 13 shows another flowchart of the method for diagnosing the high-voltage relay of the automobile provided by the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
Some embodiments of the invention are described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.
First embodiment
With the rapid development of new energy vehicles such as electric vehicles and the like, the safety requirement of a direct current driving part is more and more important and more strict, and the diagnosis and detection of a high-voltage relay in a high-voltage system of the electric vehicle is an important technology for realizing the safe power-on and power-off of the electric vehicle. Referring to fig. 1, fig. 1 shows a diagnostic apparatus for a positive relay in a high-voltage relay.
As can be seen in fig. 1, the apparatus includes a battery pack Bat, a control circuit (not shown), a positive relay SW1, a pre-charge relay SW2, a pre-charge resistor Rp, a negative relay circuit, a switch K1, a collecting resistor Rs1, a collecting resistor Rs2, a resistor R1, and a resistor R2, wherein a control terminal of the positive relay SW1 and a control terminal of the pre-charge relay SW2 are connected to the control circuit, a load terminal of the positive relay SW1 is connected to a positive electrode Bat + of the battery pack and to a positive electrode of a first load line, a negative relay circuit is connected to a negative electrode Bat of the battery pack, a load terminal of the pre-charge relay SW2 is connected in series with the pre-charge resistor Rp and then connected in parallel to both ends of the positive relay SW1, the collecting resistor Rs1, the resistor R1, and the switch K1 are connected in series and then connected in parallel to both ends of the battery pack Bat, one end of the collecting resistor Rs1 is connected to the battery pack Bat-, the first end of the collecting resistor Rs2 is connected with a negative electrode Bat-of the battery pack, the second end of the collecting resistor Rs2 is connected with one end of the resistor R2, the other end of the resistor R2 is connected with the positive electrode of the first load line, the second end of the collecting resistor Rs2 is set as a second collecting point, and the first collecting point and the second collecting point are connected with the control circuit.
The control circuit is connected with the control end of the positive relay SW1 and the control end of the pre-charging relay SW2 and used for sending out enabling control signals or opening control signals to the SW1 and the SW2 so as to enable the SW1 and the SW2 to be closed or opened, and the control circuit is also used for collecting the voltage of a first collecting point and the voltage of a second collecting point. Through the diagnosis device in the scheme, the anode relay SW1 can be diagnosed to judge whether the anode relay SW1 is adhered, wherein the adhesion condition includes that the adhesion is not closed at the upper part and not opened at the lower part.
Specifically, the single chip microcomputer sends an enable signal to the SW1 through a high-side driving chip and acquires voltage values at the positions of AD3 and AD4, resistance values of Rs1, Rs2, R1 and R2 are stored in the single chip microcomputer, voltages at two ends of the battery pack and a voltage at a positive electrode HV + of a load line can be acquired through the acquired voltage values of the two acquisition resistors and conversion according to the resistance values of the divider resistors and a circuit voltage division formula, the voltage at the positive electrode HV + of the load line and the voltages at two ends of the battery pack are compared, and if the difference between the two voltages is larger than a first preset threshold value, the SW1 cannot be closed; the single chip microcomputer sends a disconnection signal to the SW1 through the high-side driving chip, acquires voltage values at the AD3 and the AD4, calculates according to the steps, and if the difference between the voltage of the positive electrode HV + of the load line and the voltage of the two ends of the battery pack is smaller than a second preset threshold value, the SW1 cannot be disconnected.
The diagnosis device for the positive relay in the high-voltage relay, which is provided by the scheme, can effectively diagnose the adhesion condition of the positive relay SW1, the reference of the sampling voltage is unified to the ground, and the floating voltage change condition at the rear end of the relay does not exist, so that the possibility of voltage misjudgment does not exist, the accuracy of the detection result can be effectively improved, and the influence on a system network is reduced; it should be noted that the connection relationship of the negative relay circuit may be various, and is only schematically shown in fig. 1.
Referring to fig. 2 and 3, a diagnostic device is provided for high-voltage relay circuits of different situations of an electric vehicle, as can be seen from fig. 2, the diagnostic device further includes a relay SW3, a collecting resistor Rs3 and a resistor R3, a control end of the relay SW3 is connected with the control circuit, a load end of the relay SW3 is connected with a positive electrode Bat + of the battery pack and a positive electrode of a second load line, one end of a resistor R3 is connected with the positive electrode of the second load line, the other end of the resistor R3 is connected with a first end of the collecting resistor Rs3, a second end of the collecting resistor Rs3 is connected with a negative electrode Bat-of the battery pack according to an enable signal of the control circuit, the first end of the collecting resistor Rs3 is set as a third collecting point, and the third collecting point is connected with the control circuit.
The device can diagnose the adhesion condition of SW3 according to the diagnosis method for SW1, the single chip enables SW3 through the high-side driving chip, and acquires the voltage values at AD3 and AD5 through the AD acquisition channel, and judges whether SW3 can not be closed; the single chip microcomputer is disconnected with SW3, and whether SW3 can not be disconnected is judged according to the voltage values of AD3 and AD 5; further, as can be seen from fig. 3, the device further includes relays SW31, SW32 and SW33, and a resistor circuit which is the same as the collecting resistor Rs3 and the resistor R3, as with SW3, and the adhesion of the relays SW31, SW32 and SW33 can be determined as with the above-mentioned diagnostic method for SW 3.
Fig. 1 to 3 show diagnostic means for diagnosing a positive relay in a high-voltage relay of a motor vehicle, the present embodiment also provides diagnostic means for a relay in a negative relay circuit in the high-voltage relay, and fig. 4 to 8 show corresponding diagnostic means provided for different situations of the negative relay circuit.
Alternatively, referring to fig. 4, fig. 4 is a device for diagnosing a negative relay circuit in the case of a single negative pole, the negative relay circuit comprises a negative relay SW4, a collecting resistor Rs4, a resistor R4 and a resistor R5, wherein the control end of the negative relay SW4 is connected with a control circuit, the load end of the negative relay SW4 is connected with the negative electrode Bat of a battery pack and is connected with the negative electrode of a third load line, the first end of the collecting resistor Rs4 is connected with the negative electrode Bat of the battery pack, the second end of the collecting resistor Rs4 is connected with one end of the resistor R4, the other end of the resistor R4 is connected with the negative electrode of the third load line, one end of the resistor R5 is connected with the negative electrode of the third load line, the other end of the resistor R5 is connected with the positive electrode of the battery pack according to an enabling signal of the control circuit, the second end of the collecting resistor Rs4 is set as a fourth collecting point, and the fourth collecting point.
According to the diagnostic device in the above aspect, the sticking condition of negative electrode relay SW4 can be diagnosed. Specifically, an enabling command of SW4 is confirmed, a pin connected with R5 of the single chip microcomputer is enabled, SW _ Bat + is connected to a high-voltage positive electrode of the battery pack, the single chip microcomputer collects voltage at an AD9 position through an AD collection channel connected with a collection resistor Rs4, and according to the voltage division condition of a circuit, if the ratio of the voltage at the AD9 position to the voltage at two ends of the battery pack is within a first preset range, SW4 cannot be closed; confirming the switch-off command to SW4, switching SW _ Bat + into the high-voltage positive pole of the battery pack, and confirming that SW4 cannot be switched off if the collected voltage at AD9 is 0.
Taking an example as an example, assuming that the resistance value of Rs4 is 47K, the resistance value of R4 is 1768K, and the resistance value of R5 is 800K, and the enable command to SW4 is confirmed, it should be understood that SW4 is normally closed, if SW4 cannot be closed, the single chip microcomputer is in an off state, the voltage acquired at AD9 is Rs4, and the ratio of the voltage of Rs4 to the voltage at two ends of the battery pack is Rs4/(Rs4+ R4+ R5) ═ 47/(47+1768+ 800): 1:55.6 by circuit voltage division calculation, so if the ratio of the voltage acquired by AD9 to the voltage at two ends of the battery pack is 1:55.6, then SW4 was deemed not to be closed, and due to the slight difference between the nominal and actual values of the circuit components, the ratio of 1:55.6 the ratio can be suitably adjusted to widen the range of ratios, for example, the ratio is 1: 53 to 1: SW4 is not considered to be closed between 58.
Alternatively, referring to fig. 5, fig. 5 is a diagnostic apparatus for the case of two parallel negative electrodes, where the negative relay circuit includes a relay SW5, a relay SW6, a collecting resistor Rs5, a resistor R6, a resistor R7, a resistor R8, and a resistor R9, the control terminals of the relay SW5 and the relay SW6 are connected to the control circuit, the load terminal of the relay SW5 is connected to the negative Bat "of the battery pack and to the negative electrode of the fourth load line, the load terminal of the relay SW6 is connected to the negative Bat" of the battery pack and to the negative electrode of the fifth load line, the first terminal of the collecting resistor Rs5 is connected to the negative Bat "of the battery pack, the second terminal of the collecting resistor Rs5 is connected to one terminal of the resistor R6 and one terminal of the resistor R48, the other terminal of the resistor R6 is connected to the negative electrode of the fourth load line, the other terminal of the resistor R7 is connected to the negative electrode of the fifth load line, one terminal of the, one end of the resistor R9 is connected with the negative electrode of the fifth load line, the other end of the resistor R8 and the other end of the resistor R9 can connect SW _ Bat + with the positive electrode of the battery pack according to an enabling signal of the control circuit, the second end of the collecting resistor Rs5 is set as a fifth collecting point, and the fifth collecting point is connected with the control circuit.
The diagnostic device in the scheme can diagnose the adhesion condition of the relays SW5 and SW 6. Specifically, there are many cases in which the enable commands to SW5 and SW6 are confirmed, the pins of the single chip microcomputer connected to R8 and R9 are enabled, SW _ Bat + is connected to the high-voltage positive electrode of the battery pack, and the diagnosis as to whether SW5 and SW6 cannot be closed is made.
If the ratio of the voltage value acquired by the single chip microcomputer at the AD10 to the voltage values at the two ends of the battery pack is within a second preset range, it is determined that both SW5 and SW6 cannot be closed; if the ratio of the voltage value acquired by the single chip microcomputer at the AD10 to the voltage values at the two ends of the battery pack is within a third preset range, the SW6 is confirmed to be not closed; and if the ratio of the voltage value acquired by the single chip microcomputer at the AD10 to the voltage values at the two ends of the battery pack is within a fourth preset range, the SW5 is confirmed to be incapable of being closed.
And confirming an off enabling command of the SW5 and the SW6, connecting the SW _ Bat + to the high-voltage positive pole of the battery pack, and judging whether the relays can not be switched off or not by the diagnosis mode so as to further determine the adhesion condition of each relay. Each preset range is determined according to a preset ratio of the collected voltage of the AD10 to the voltages at the two ends of the battery pack under the corresponding adhesion condition, the preset ratio can be obtained by circuit resistance voltage division analysis, and specifically can be obtained by referring to the manner illustrated in fig. 4.
Alternatively, referring to fig. 6, fig. 6 is a diagnostic apparatus for the case that two negative electrodes are not connected in parallel, the negative relay circuit includes a relay SW7, a relay SW8, a collecting resistor Rs6, a resistor R10, a resistor R11, a resistor R12 and a resistor R13, a control terminal of the relay SW7 and a control terminal of the relay SW8 are connected to the control circuit, a load terminal of the relay SW7 is connected to the negative electrode Bat-of the battery pack and to the negative electrode of a sixth load line, a load terminal of the relay SW8 is connected to the end of the relay SW7 away from the negative electrode Bat-of the battery pack and to the negative electrode of the seventh load line, a first terminal of the collecting resistor Rs6 is connected to the negative electrode Bat-of the battery pack, a second terminal of the collecting resistor Rs6 is connected to one end of the resistor R10 and one end of the resistor R11, the other terminal of the resistor R10 is connected to the negative electrode of the sixth load line, the other terminal of the resistor R11 is connected to the, one end of the resistor R13 is connected with the negative electrode of the seventh load line, the other end of the resistor R12 and the other end of the resistor R13 are connected with the positive electrode of the battery pack according to an enabling signal of the control circuit, the second end of the collecting resistor Rs6 is set as a sixth collecting point, and the sixth collecting point is connected with the control circuit.
The diagnostic device in the scheme can diagnose the adhesion condition of the relays SW7 and SW8, specifically, respectively confirms the enabling commands of the relays SW7 and SW8 and the opening commands of the relays SW7 and SW8, diagnoses the relays SW7 and SW8 when the pins enabling the single chip microcomputer to be connected with the R12 and R13 are connected with the high-voltage positive electrode of the battery pack and judges the adhesion condition of each relay, the specific diagnostic process is the same as the diagnostic process of the relays SW5 and SW6 in the case of the two-way negative electrode parallel connection in the scheme 5, and the preset range is determined according to the circuit connection relation, the resistance value and the circuit voltage division in the case of the two-way negative electrode non-parallel connection.
Alternatively, referring to fig. 7, fig. 7 is a diagnostic device for another case of a negative relay circuit, the negative relay circuit comprises a negative relay SW9, a relay SW10, a relay SW11, a collecting resistor Rs7, a collecting resistor Rs8, a resistor R14, a resistor R15, a resistor R16, a resistor R17, a resistor R18 and a resistor R19, wherein a control end of the negative relay SW9, a control end of the relay SW10 and a control end of the relay SW11 are connected with the control circuit, a load end of the negative relay SW9 is connected with a negative electrode of a battery pack and is connected with a negative electrode of an eighth load line, a first end of the collecting resistor Rs7 is connected with the negative electrode of the battery pack, a second end of the collecting resistor Rs7 is connected with one end of the resistor R14, the other end of the resistor R14 is connected with the negative electrode of the eighth load line, one end of the resistor R15 is connected with the negative electrode of the eighth load line, and the other end of the resistor R15 is; the load end of the relay SW10 is connected with the cathode of the battery pack and the cathode of the ninth load line, the load end of the relay SW11 is connected with one end of the relay SW10, which is far away from the cathode of the battery pack, and the cathode of the tenth load line, the first end of the collection resistor Rs8 is connected with the cathode of the battery pack, the second end of the collection resistor Rs8 is respectively connected with one end of a resistor R16 and one end of a resistor R17, the other end of the resistor R16 is connected with the cathode of the ninth load line, the other end of the resistor R17 is connected with the cathode of the tenth load line, one end of the resistor R18 is connected with the cathode of the ninth load line, one end of a resistor R19 is connected with the cathode of the ninth, the other end of the resistor R19 is connected with the anode of the battery pack according to an enabling signal of the control circuit, the second end of the collecting resistor Rs7 is set as a seventh collecting point, the second end of the collecting resistor Rs8 is set as an eighth collecting point, and the seventh collecting point and the eighth collecting point are connected with the control circuit.
In the diagnosis method of the diagnosis device for SW10 and SW11 in this case, reference may be made to the diagnosis method in the case that two paths of cathodes are not connected in parallel in fig. 6, and for SW9, a single judgment may be performed on the diagnosis method for SW4 in the case that one path of cathodes is shown in fig. 4.
Alternatively, referring to fig. 8, fig. 8 is a diagnostic device for another case of a negative relay circuit, the negative relay circuit comprises a third negative relay SW12, an eighth relay SW13, a ninth relay SW14, a ninth acquisition resistor Rs9, a tenth acquisition resistor Rs10, a resistor R20, a resistor R21, a resistor R22, a resistor R23, a resistor R24 and a resistor R25, wherein a control end of the negative relay SW12, a control end of the relay SW13 and a control end of the relay SW14 are connected with the control circuit, a load end of the negative relay SW12 is connected with a negative electrode of the battery pack and is connected with a negative electrode of an eleventh load line, a first end of the acquisition resistor Rs9 is connected with the negative electrode of the battery pack, a second end of the acquisition resistor Rs9 is connected with one end of the resistor R20, the other end of the resistor R20 is connected with the negative electrode of the eleventh load line, one end of the resistor R21 is connected with the negative electrode of the eleventh load line, and the other end of the resistor R21 is connected with the positive electrode; the load end of the relay SW13 is connected with the cathode of the battery pack and connected with the cathode of the twelfth load line, the load end of the relay SW14 is connected with the cathode of the battery pack and connected with the cathode of the thirteenth load line, the first end of the collection resistor Rs10 is connected with the cathode of the battery pack, the second end of the collection resistor Rs10 is respectively connected with one end of a resistor R22 and one end of a resistor R23, the other end of the resistor R22 is connected with the cathode of the twelfth load line, the other end of the resistor R23 is connected with the cathode of the thirteenth load line, one end of a resistor R24 is connected with the cathode of the twelfth load line, one end of a resistor R25 is connected with the cathode of the thirteenth load line, and, the other end of the resistor R25 is connected with the anode of the battery pack according to an enabling signal of the control circuit, the second end of the collecting resistor Rs9 is set as a ninth collecting point, the second end of the collecting resistor Rs10 is set as a tenth collecting point, and the ninth collecting point and the tenth collecting point are connected with the control circuit.
In the diagnosis method of the diagnosis device for SW13 and SW14 in this case, reference may be made to the diagnosis method of SW5 and SW6 in the case that two negative electrodes are connected in parallel in fig. 5, and for SW12, independent judgment may be performed on the diagnosis method of SW4 in the case that one negative electrode is connected as shown in fig. 4.
Second embodiment
The present embodiment provides a method for diagnosing an automotive high-voltage relay, which can be applied to the diagnostic apparatus described in the first embodiment, and referring to fig. 9 for the diagnostic apparatus for a positive-pole relay shown in fig. 1 in the first embodiment, the method includes:
s100: the control circuit sends an enabling control signal or a disconnecting control signal to the positive relay;
s101: acquiring voltage values of a first acquisition point and a second acquisition point, and calculating a voltage value of the positive pole of a first load line connected with a positive relay and voltage values of two ends of a battery pack according to the voltage value of the first acquisition point and the voltage value of the second acquisition point;
s102: if the enabling control signal is sent to the positive relay, whether the difference value between the voltage value of the positive electrode of the first load line and the voltage values of the two ends of the battery pack is larger than a first preset threshold value or not is judged;
s1021: if so, determining that the positive relay cannot be closed;
s103: if a disconnection control signal is sent to the positive relay, whether the difference value between the voltage value of the positive electrode of the first load line and the voltage values of the two ends of the battery pack is smaller than a second preset threshold value or not is judged;
s1031: if the current is less than the preset value, the positive relay is determined to be disconnected.
For the diagnostic apparatus shown in the remaining figures in the first embodiment, the diagnostic method can refer to the corresponding description in the first embodiment, and will not be repeated herein.
In the power supply system of the electric vehicle, the control circuit specifically includes a single chip, a high-side driving circuit, and a low-side driving circuit, the high-side driving circuit includes a high-side driving chip, such as TPS4H160, the single chip is connected to the high-side driving chip, and the high-side driving chip is connected to the control end of the high-side relay, that is, to the control ends of the plurality of high-voltage relays that need to be diagnosed in the first embodiment. The diagnosis method provided in this embodiment can diagnose the high-voltage relay, and can also diagnose the high-side driver chip, referring to fig. 10, specifically:
s200: the single chip microcomputer sends an enabling signal to a high-side driving diagnosis error pin of the high-side driving chip.
S201: the port state of the high side drive diagnostic error pin is detected.
S202: and if the output of the high-side driving diagnosis error pin is low level, determining that the high-side driving chip has a fault.
Taking the high-side driving chip TPS4H160 as an example, the high-side driving diagnostic error pin power-on enable of the chip is 1, the single chip detects the port state of the pin in a periodic frequency cycle, and when the output of the pin is once low, the chip is confirmed to be faulty.
The diagnosis method provided in this embodiment may also be used to diagnose an open/short circuit of an output channel of the high-side driver chip, referring to fig. 11, the method further includes:
s300: and when the channel enabling pin of the high-side driving chip is not enabled, the single chip acquires the voltage of the output channel of the high-side driving chip.
S301: and if the ratio of the voltage of the output channel to the power voltage supplied to the high-side driving chip by the single chip microcomputer is within a first preset ratio range, determining that the positive electrodes of the output channel and the high-side driving chip are short-circuited.
S302: and if the ratio of the voltage of the output channel to the power voltage supplied to the high-side driving chip by the single chip microcomputer is within a second preset ratio range, determining that the power ground of the output channel and the high-side driving chip is short-circuited.
Taking a high-side driving chip TPS4H160 as an example, detecting an output channel of the chip, collecting the voltage of the output channel when a channel enabling pin of the chip is not enabled by the singlechip, and if the ratio of the voltage of the output channel to the power supply voltage is within a first preset ratio range, determining that the output channel is short-circuited with the positive electrode of the power supply, wherein the first preset ratio range can be 90% -110%; if the ratio to the power voltage is within a second predetermined ratio, which may range from 0% to 15%, it is considered to be shorted to ground.
Further, a low-side driving circuit is connected to the single chip and the control end of the low-side relay, the low-side driving circuit includes a low-side driving MOS transistor, and fig. 12 is a circuit diagram of the low-side driving circuit, the diagnosis method provided in this embodiment may further perform diagnosis on the low-side driving MOS transistor in the low-side driving circuit, referring to fig. 13, the method includes:
s400: when the single chip microcomputer enables the low side of the low side driving circuit to drive the MOS tube control pin, the voltage value of the low side driving relay control pin of the low side driving circuit is collected.
S401: and if the voltage value of the control pin of the low-side driving relay exceeds a third preset threshold value, determining that the low-side driving MOS tube is abnormal.
S402: when the low-side driving MOS tube control pin of the low-side driving circuit is not enabled, the single chip microcomputer collects the voltage value of the low-side driving relay control pin of the low-side driving circuit.
S403: and if the voltage value of the control pin of the low-side driving relay is smaller than a fourth preset threshold value, determining that the low-side driving MOS tube is abnormal.
Fig. 12 shows a circuit of the low-side driving circuit, where the single chip sets a control pin M _ relax _ LS1_ DOH of the low-side driving MOS transistor to 1, the low-side driving MOS transistor is turned on to ground, so that a voltage of a control pin EXT _ relax _ DO _ LS1 of the low-side driving RELAY is pulled low, a voltage at an end of the EXT _ relax _ DO _ LS1 is collected through an AD collection channel of the single chip, the voltage of the pin should be close to 0V at this time, if the voltage exceeds a third preset threshold, the low-side driving MOS transistor is considered to be abnormal, and the third preset threshold may be 7V; when the single chip microcomputer sets M _ RELAY _ LS1_ DOH to 0, the end of the low-side driving RELAY control pin EXT _ RELAY _ DO _ LS1 is close to 12V of the end EXT _ POS _ B +, if the voltage of the low-side driving RELAY control pin EXT _ RELAY _ DO _ LS1 is lower than a fourth preset threshold value, the low-side driving MOS tube is considered to be abnormal, and the fourth preset threshold value can be 2V.
It should be noted that, for convenience and simplicity of description, the diagnostic method for the high-voltage relay in this embodiment should further include the diagnostic apparatus applied in fig. 2 to 8, and for a specific working process thereof, reference may be made to a corresponding diagnostic process in the foregoing apparatus, and redundant description is not repeated here.
In summary, the diagnosis method for the high-voltage relay of the automobile provided by the embodiment can effectively diagnose the high-voltage relay, and can diagnose the high-side driving chip, the output channel of the high-side driving chip and the low-side driving MOS transistor at the same time, so that the diagnosis is performed according to the safety performance standard of a passenger car, and the safety is improved.
It should be noted that, in the present specification, the embodiments are all described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other. For the embodiment of the diagnostic method, since it has been explained in the embodiment of the apparatus, the description is relatively simple, and for the relevant points, reference may be made to the partial description of the foregoing embodiment.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is only an alternative embodiment of the present invention and is not intended to limit the present invention, and various modifications and variations of the present invention may occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. The utility model provides an automobile high-voltage relay diagnostic device, its characterized in that, includes group battery, control circuit, anodal relay, precharge resistance, negative pole relay circuit, first switch, first collection resistance, second collection resistance, first resistance and second resistance, anodal relay's control end precharge relay's control end with control circuit connects, control circuit be used for to with the relay that control circuit connects sends enable control signal or disconnection control signal, anodal relay's load end is connected the positive pole of group battery and is connected first load line positive pole, negative pole relay circuit connects the negative pole of group battery, precharge relay load end with precharge resistance connects in parallel after establishing ties at anodal relay's both ends, first collection resistance, The first resistor and the first switch are connected in parallel at two ends of the battery pack after being sequentially connected, one end of the first collecting resistor is connected with the negative electrode of the battery pack, the other end of the first collecting resistor is set as a first collecting point, the first end of the second collecting resistor is connected with the negative electrode of the battery pack, the second end of the second collecting resistor is connected with one end of the second resistor, the other end of the second resistor is connected with the positive electrode of the first load line, the second end of the second collecting resistor is set as a second collecting point, the first collecting point and the second collecting point are connected with the control circuit, and the control circuit is further used for collecting the voltage of the first collecting point and the voltage of the second collecting point;
the negative relay circuit comprises a first negative relay, a fourth acquisition resistor, a fourth resistor and a fifth resistor, wherein the control end of the first negative relay is connected with the control circuit, the load end of the first negative relay is connected with the negative electrode of the battery pack and is connected with the negative electrode of a third load line, the first end of the fourth acquisition resistor is connected with the negative electrode of the battery pack, the second end of the fourth acquisition resistor is connected with one end of the fourth resistor, the other end of the fourth resistor is connected with the negative electrode of the third load line, one end of the fifth resistor is connected with the negative electrode of the third load line, the other end of the fifth resistor is connected with the positive electrode of the battery pack according to an enabling signal of the control circuit, the second end of the fourth acquisition resistor is set as a fourth acquisition point, and the fourth acquisition point is connected with the control circuit, the control circuit is also used for collecting the voltage of the fourth collecting point;
the control circuit is used for sending an enabling command to a control end of a first negative relay and controlling the other end of the fifth resistor to be connected with the anode of the battery pack, and the control circuit is used for collecting the voltage of a fourth collecting point after the other end of the fifth resistor is connected with the anode of the battery pack and determining that the first negative relay cannot be closed when the ratio of the voltage of the fourth collecting point to the voltage of the two ends of the battery pack is within a first preset range.
2. The device according to claim 1, further comprising a first relay, a third collecting resistor and a third resistor, wherein a control terminal of the first relay is connected to the control circuit, a load terminal of the first relay is connected to an anode of the battery pack and an anode of a second load line, one terminal of the third resistor is connected to the anode of the second load line, the other terminal of the third resistor is connected to a first terminal of the third collecting resistor, a second terminal of the third collecting resistor is connected to a cathode of the battery pack according to an enable signal of the control circuit, the first terminal of the third collecting resistor is set as a third collecting point, and the third collecting point is connected to the control circuit, and the control circuit is further configured to collect a voltage of the third collecting point.
3. The device according to claim 1 or 2, wherein the negative relay circuit comprises a second relay, a third relay, a fifth collecting resistor, a sixth resistor, a seventh resistor, an eighth resistor and a ninth resistor, the control terminal of the second relay and the control terminal of the third relay are connected with the control circuit, the load terminal of the second relay is connected with the negative electrode of the battery pack and connected with the negative electrode of a fourth load line, the load terminal of the third relay is connected with the negative electrode of the battery pack and connected with the negative electrode of a fifth load line, the first terminal of the fifth collecting resistor is connected with the negative electrode of the battery pack, the second terminal of the fifth collecting resistor is respectively connected with one terminal of the sixth resistor and one terminal of the seventh resistor, the other terminal of the sixth resistor is connected with the negative electrode of the fourth load line, and the other terminal of the seventh resistor is connected with the negative electrode of the fifth load line, one end of the eighth resistor is connected with the negative electrode of the fourth load line, one end of the ninth resistor is connected with the negative electrode of the fifth load line, the other end of the eighth resistor and the other end of the ninth resistor are connected with the positive electrode of the battery pack according to an enabling signal of the control circuit, the second end of the fifth collecting resistor is set as a fifth collecting point, the fifth collecting point is connected with the control circuit, and the control circuit is further used for collecting the voltage of the fifth collecting point.
4. The device according to claim 1 or 2, wherein the negative relay circuit comprises a fourth relay, a fifth relay, a sixth collecting resistor, a tenth resistor, an eleventh resistor, a twelfth resistor and a thirteenth resistor, a control terminal of the fourth relay and a control terminal of the fifth relay are connected with the control circuit, a load terminal of the fourth relay is connected with the negative electrode of the battery pack and a negative electrode of a sixth load line, a load terminal of the fifth relay is connected with one end of the fourth relay far from the negative electrode of the battery pack and a negative electrode of a seventh load line, a first terminal of the sixth collecting resistor is connected with the negative electrode of the battery pack, a second terminal of the sixth collecting resistor is respectively connected with one end of the tenth resistor and one end of the eleventh resistor, and the other end of the tenth resistor is connected with the negative electrode of the sixth load line, the other end of the eleventh resistor is connected with the negative electrode of the seventh load line, one end of the twelfth resistor is connected with the negative electrode of the sixth load line, one end of the thirteenth resistor is connected with the negative electrode of the seventh load line, the other end of the twelfth resistor and the other end of the thirteenth resistor are connected with the positive electrode of the battery pack according to an enabling signal of the control circuit, the second end of the sixth collecting resistor is set as a sixth collecting point, the sixth collecting point is connected with the control circuit, and the control circuit is further used for collecting the voltage of the sixth collecting point.
5. The device according to claim 1 or 2, wherein the negative relay circuit comprises a second negative relay, a sixth relay, a seventh collecting resistor, an eighth collecting resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, an eighteenth resistor and a nineteenth resistor, the control end of the second negative relay, the control end of the sixth relay and the control end of the seventh relay are connected with the control circuit, the load end of the second negative relay is connected with the negative electrode of the battery pack and the negative electrode of an eighth load line, the first end of the seventh collecting resistor is connected with the negative electrode of the battery pack, the second end of the seventh collecting resistor is connected with one end of the fourteenth resistor, and the other end of the fourteenth resistor is connected with the negative electrode of the eighth load line, one end of the fifteenth resistor is connected with the negative electrode of the eighth load line, and the other end of the fifteenth resistor is connected with the positive electrode of the battery pack according to an enable signal of the control circuit;
the load end of the sixth relay is connected with the negative pole of the battery pack and is connected with the negative pole of a ninth load line, the load end of the seventh relay is connected with one end of the sixth relay, which is far away from the negative pole of the battery pack, and is connected with the negative pole of a tenth load line, the first end of the eighth acquisition resistor is connected with the negative pole of the battery pack, the second end of the eighth acquisition resistor is respectively connected with one end of the sixteenth resistor and one end of a seventeenth resistor, the other end of the sixteenth resistor is connected with the negative pole of the ninth load line, the other end of the seventeenth resistor is connected with the negative pole of the tenth load line, one end of the eighteenth resistor is connected with the negative pole of the ninth load line, one end of the nineteenth resistor is connected with the negative pole of the ninth load line, and the other ends of the eighteenth resistor and the nineteenth resistor are connected with the positive pole of the battery pack according to, the second end of the seventh collecting resistor is set as a seventh collecting point, the second end of the eighth collecting resistor is set as an eighth collecting point, the seventh collecting point and the eighth collecting point are connected with the control circuit, and the control circuit is further used for collecting the voltage of the seventh collecting point and the voltage of the eighth collecting point.
6. A method for diagnosing a high-voltage relay of an automobile, applied to the apparatus according to any one of claims 1 to 5, comprising:
the control circuit sends an enabling control signal or a disconnecting control signal to the positive relay;
acquiring voltage values of a first acquisition point and a second acquisition point, and calculating a voltage value of the positive pole of a first load line connected with the positive pole relay and voltage values of two ends of the battery pack according to the voltage value of the first acquisition point and the voltage value of the second acquisition point;
if an enabling control signal is sent to the positive relay, whether the difference value between the voltage value of the positive electrode of the first load line and the voltage values of the two ends of the battery pack is larger than a first preset threshold value or not is judged;
if so, determining that the positive relay cannot be closed;
if a disconnection control signal is sent to the positive relay, whether the difference value between the voltage value of the positive electrode of the first load line and the voltage values of the two ends of the battery pack is smaller than a second preset threshold value or not is judged;
if the positive relay is smaller than the preset threshold, determining that the positive relay cannot be disconnected;
the control circuit sends an enabling command to the first negative relay and controls a first end, far away from the negative pole of the third load line, of the fifth resistor to be connected with the positive pole of the battery pack;
and collecting the voltage of a fourth collecting point after the first end of the fifth resistor is connected with the anode of the battery pack, and determining that the first negative relay cannot be closed when the ratio of the voltage of the fourth collecting point to the voltages at the two ends of the battery pack is within a first preset range.
7. The method of claim 6, wherein the control circuit comprises a single chip and a high side driver circuit, the high side driver circuit comprises a high side driver chip, the single chip is connected with the high side driver chip, the high side driver chip is connected with control terminals of a plurality of relays, the method comprises:
the single chip microcomputer sends an enabling signal to a high-side driving diagnosis error pin of the high-side driving chip;
detecting the port state of the high-side driving diagnosis error pin;
and if the output of the high-side driving diagnosis error pin is low level, determining that the high-side driving chip has a fault.
8. The method of claim 6, wherein the control circuit comprises a single chip and a high side driver circuit, the high side driver circuit comprises a high side driver chip, the single chip is connected with the high side driver chip, the high side driver chip is connected with control terminals of a plurality of relays, the method comprises:
the single chip microcomputer collects the voltage of an output channel of the high-side driving chip when a channel enabling pin of the high-side driving chip is not enabled;
if the ratio of the voltage of the output channel to the power voltage provided by the single chip microcomputer to the high-side driving chip is within a first preset ratio range, determining that the positive electrodes of the output channel and the high-side driving chip are short-circuited;
and if the ratio of the voltage of the output channel to the power voltage provided by the singlechip to the high-side driving chip is within a second preset ratio range, determining that the power ground of the output channel and the high-side driving chip is short-circuited.
9. The method of claim 6, wherein the control circuit comprises a single chip and a low side driver circuit, the low side driver circuit is connected with the single chip and with a control terminal of a low side relay, the low side driver circuit comprises a low side driver MOS transistor, and the method comprises:
the singlechip acquires the voltage value of the low-side drive relay control pin of the low-side drive circuit when enabling the low-side drive MOS tube control pin of the low-side drive circuit;
if the voltage value of the control pin of the low-side drive relay exceeds a third preset threshold value, determining that the low-side drive MOS tube is abnormal;
the single chip microcomputer collects the voltage value of a low-side drive relay control pin of the low-side drive circuit when the low-side drive MOS tube control pin of the low-side drive circuit is not enabled;
and if the voltage value of the control pin of the low-side drive relay is smaller than a fourth preset threshold value, determining that the low-side drive MOS tube is abnormal.
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| CN112230132B (en) * | 2020-04-14 | 2024-04-19 | 北京国家新能源汽车技术创新中心有限公司 | Device and method for detecting failure of high-voltage relay of battery management system |
| CN111880088A (en) * | 2020-07-23 | 2020-11-03 | 上海英恒电子有限公司 | Relay bilateral control and diagnosis circuit and method and battery management system |
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