CN113844295A - Circuit checking method, signal checking method, charger and vehicle - Google Patents
Circuit checking method, signal checking method, charger and vehicle Download PDFInfo
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- CN113844295A CN113844295A CN202111070690.4A CN202111070690A CN113844295A CN 113844295 A CN113844295 A CN 113844295A CN 202111070690 A CN202111070690 A CN 202111070690A CN 113844295 A CN113844295 A CN 113844295A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/20—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by converters located in the vehicle
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/14—Plug-in electric vehicles
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- Transportation (AREA)
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- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention provides a circuit checking method, a signal checking method, a charger and a vehicle. The circuit verification method comprises the following steps: when the charger is not connected with a charging gun, a preset signal is periodically output to the signal detection circuit, and the preset signal is matched with a control guide signal of the charging gun; and judging whether the signal detection circuit is normal or not based on the deviation value of the signal of the preset detection point of the signal detection circuit and the ideal signal. By the configuration, the verification of the signal detection circuit can be completed by adding less circuit cost, and the control pilot signal can be verified on the basis of the signal detection circuit, so that the problem that a method and a device for verifying whether the control pilot signal is normal or not are lacked in the prior art is solved.
Description
Technical Field
The invention relates to the technical field of vehicles, in particular to a circuit checking method, a signal checking method, a charger and a vehicle.
Background
The charger is used for converting AC power grid energy into DC energy to charge the high-voltage direct-current battery. In order to confirm the communication between an electric vehicle (hereinafter referred to as EV, including electric-only BEV and hybrid electric vehicle, PHEV) and a charging pile (hereinafter referred to as EVSE), the communication between EV and EVSE is identified by CC (control configuration) and CP (control pilot) signal states, as defined in GBT 18487.1-2015 electric vehicle conduction charging system part 1 — general requirements. The CC signal is used for detecting the connection state of the charging gun and the whole vehicle socket, and the CP signal is used for detecting the connection state of the charging gun and the whole vehicle socket and identifying the limitation of charging current. Taking the charging mode 3 connection mode C defined by GBT 18487.1-2015 as an example, details of connection modes between EV, EVSE, CC and CP are shown in fig. 1. Fig. 1 is a schematic diagram of a charging post electrically connected to a vehicle. In fig. 1, the EV includes a vehicle-mounted charger 2, and when the vehicle-mounted charger 2 is connected to the EVSE, a plurality of lines are connected by a connection portion 1.
China 6 (hereinafter, abbreviated as "country 6") is an emission standard (hereinafter, abbreviated as "OBD standard") for hybrid electric vehicles (HEVs, PHEVs) and is intended to satisfy a pollutant emission limit by a vehicle-wide design. Similarly, similar emissions standards exist abroad such as the Carb Standard in the United states, and the like. Although the legislation of pure electric vehicles (BEV) has no clear emission standard, the mainstream domestic and foreign complete vehicle suppliers (hereinafter referred to as OEMs) require that pure electric vehicles produced in batches after 2025 years meet the emission standard.
Whether the functions of the OBD related parts in the controller are normal or not is required to be identified in the OBD standards at home and abroad, and once the functions of the parts are abnormal, the abnormal output of the controller can influence the emission of the whole vehicle. The components defined in the OBD regulations typically include signals such as sensors, actuators, and internal power supplies. OBD regulations often require that a component be rationalized in order to determine whether the component is functioning properly.
For the charger 2 shown in fig. 1, the CP signal as a control guide device for realizing EV and EVSE will affect the normal operation of the charger once the connection or state is abnormal, so it is an OBD related actuator. The state of the CP signal is generally classified into two states of a fixed voltage value and a PWM voltage signal, in which charging is allowed only when the amplitude and duty ratio of the PWM are within a certain range, and the duty ratio represents the charging current limit value. A very reliable reasonable CP signal is required.
The current OBD regulations do not clearly define the diagnostic strategy of the actuator, and the accumulated experience of home and abroad host plants or component suppliers is relatively limited, but with the increasing importance of the regulation policy on the OBD emission standard, a rationality verification strategy for the actuator is urgently needed to meet the OBD regulations.
That is, there is a lack in the prior art of a method and apparatus capable of verifying whether a CP signal is normal.
Disclosure of Invention
The invention aims to provide a circuit checking method, a signal checking method, a charger and a vehicle, and solves the problem that a method and a device capable of checking whether a control guide signal is normal or not are lacked in the prior art.
In order to solve the above technical problem, according to a first aspect of the present invention, there is provided a circuit verification method for determining whether a signal detection circuit of a charger is normal, the circuit verification method including:
when the charger is not connected with a charging gun, periodically inputting a preset signal to the signal detection circuit, wherein the preset signal is matched with a control guide signal of the charging gun;
according to the preset signal, the signal detection circuit generates a detection signal at a preset detection point of the signal detection circuit; and the number of the first and second groups,
and judging whether the signal detection circuit is normal or not based on the deviation value of the detection signal and the ideal signal.
Optionally, the preset signal includes a signal with a fixed voltage value and a pulse width modulation signal.
Optionally, when outputting the preset signal to the signal detection circuit, the circuit verification method further includes: the circuit configuration of the signal detection circuit is periodically changed.
Optionally, the signal detection circuit includes a resistance value change switch, and the step of periodically inputting the preset signal to the signal detection circuit includes:
the following steps are performed periodically:
s11 turning off the resistance value changing switch, and outputting a signal of a fixed voltage value to the signal detection circuit;
s12 closing the resistance value changing switch to output a signal of a fixed voltage value to the signal detection circuit;
s13 turning off the resistance value changing switch, and outputting a pulse width modulation signal to the signal detection circuit; and the number of the first and second groups,
s14 closes the resistance change switch, outputting a pulse width modulation signal to the signal detection circuit.
The step of determining whether the signal detection circuit is normal based on a deviation value of the detection signal from the ideal signal includes:
determining whether the signal detection circuit is normal based on at least one of the first deviation value, the second deviation value, the third deviation value, and the fourth deviation value;
the first deviation value is a deviation value of the detection signal and the ideal signal after the step S11 is performed; the second deviation value is a deviation value of the detection signal and the ideal signal after the step S12 is performed; the third deviation value is a deviation value of the detection signal and the ideal signal after the step S13 is performed; the fourth deviation value is a deviation value of the detection signal from the ideal signal after the execution of step S14.
Optionally, the circuit verification method further includes: and when the charger is connected with the charging gun, the preset signal is stopped being output to the signal detection circuit.
In order to solve the above technical problem, according to a second aspect of the present invention, there is provided a signal verification method including:
judging whether a signal detection circuit of the charger is normal or not based on the circuit checking method;
and if the signal detection circuit is normal, judging whether the control guide signal of the charging gun is normal or not based on the signal detection circuit.
In order to solve the above technical problem, according to a third aspect of the present invention, there is provided a charger including a signal source generating circuit and a signal detecting circuit, wherein,
the signal source generating circuit is used for responding to a control signal and outputting a preset signal, and the preset signal is matched with a control guide signal of the charging gun;
the output end of the signal source generating circuit is connected with the input end of the signal detection circuit, so that the preset signal output by the signal source generating circuit is input to the signal detection circuit, and whether the signal detection circuit is normal or not is judged based on the preset signal.
In order to solve the above technical problem, according to a fourth aspect of the present invention, a vehicle is provided, where the vehicle includes the above charger and a controller, and the controller is configured to output a control signal to drive the signal source generating circuit to periodically input the preset signal to the signal detecting circuit when the charger is not connected to the charging gun, and determine whether the signal detecting circuit is normal according to a deviation value between a signal at a preset detection point of the signal detecting circuit and an ideal signal, where the preset signal matches with a control pilot signal of the charging gun.
Optionally, the controller is further configured to determine whether the control pilot signal of the charging gun is normal based on the signal detection circuit if the signal detection circuit is normal.
Compared with the prior art, the circuit verification method, the signal verification method, the charger and the vehicle provided by the invention have the advantages that: when the charger is not connected with a charging gun, a preset signal is periodically output to the signal detection circuit, and the preset signal is matched with a control guide signal of the charging gun; and judging whether the signal detection circuit is normal or not based on the deviation value of the signal of the preset detection point of the signal detection circuit and the ideal signal. By the configuration, the verification of the signal detection circuit can be completed by adding less circuit cost, and the control pilot signal can be verified on the basis of the signal detection circuit, so that the problem that a method and a device for verifying whether the control pilot signal is normal or not are lacked in the prior art is solved.
Drawings
It will be appreciated by those skilled in the art that the drawings are provided for a better understanding of the invention and do not constitute any limitation to the scope of the invention. Wherein:
FIG. 1 is a schematic diagram of a charging post electrically connected to a vehicle;
fig. 2 is a schematic circuit diagram of a charger according to an embodiment of the present invention;
FIG. 3 is a flow chart of a circuit verification method according to an embodiment of the invention;
fig. 4 is a schematic flow chart of a circuit verification method according to an embodiment of the invention.
In the drawings:
1-a connecting part; 2-vehicle charger; 4-a charger; 5-a signal source generating circuit; 6-a signal detection circuit; 7-resistance change switch.
Detailed Description
To further clarify the objects, advantages and features of the present invention, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings. It is to be noted that the drawings are in greatly simplified form and are not to scale, but are merely intended to facilitate and clarify the explanation of the embodiments of the present invention. Further, the structures illustrated in the drawings are often part of actual structures. In particular, the drawings may have different emphasis points and may sometimes be scaled differently.
As used in this application, the singular forms "a", "an" and "the" include plural referents, the term "or" is generally employed in a sense including "and/or," the terms "a" and "an" are generally employed in a sense including "at least one," the terms "at least two" are generally employed in a sense including "two or more," and the terms "first", "second" and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to the number of technical features indicated. Thus, features defined as "first", "second" and "third" may explicitly or implicitly include one or at least two of the features, "one end" and "the other end" and "proximal end" and "distal end" generally refer to the corresponding two parts, which include not only the end points, but also the terms "mounted", "connected" and "connected" should be understood broadly, e.g., as a fixed connection, as a detachable connection, or as an integral part; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. Furthermore, as used in the present invention, the disposition of an element with another element generally only means that there is a connection, coupling, fit or driving relationship between the two elements, and the connection, coupling, fit or driving relationship between the two elements may be direct or indirect through intermediate elements, and cannot be understood as indicating or implying any spatial positional relationship between the two elements, i.e., an element may be in any orientation inside, outside, above, below or to one side of another element, unless the content clearly indicates otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The core idea of the invention is to provide a circuit checking method, a signal checking method, a charger and a vehicle, so as to solve the problem that a method and a device capable of checking whether a pilot signal is normal or not are lacked in the prior art.
The following description refers to the accompanying drawings.
Referring to fig. 2 to fig. 4, fig. 2 is a schematic circuit diagram of a charger according to an embodiment of the present invention; FIG. 3 is a flow chart of a circuit verification method according to an embodiment of the invention; fig. 4 is a schematic flow chart of a circuit verification method according to an embodiment of the invention.
As shown in fig. 2, in order to check whether the control pilot signal is normal, the present embodiment provides a charger 4, which includes a signal source generating circuit 5 and a signal detecting circuit 6, wherein,
the signal source generating circuit 5 is configured to output a preset signal in response to a control signal, where the preset signal is matched with a control pilot signal (in fig. 2, namely, a CP signal) of the charging gun;
the output end of the signal source generating circuit 5 is connected with the input end of the signal detection circuit 6.
The control signal is provided by a Controller of the vehicle, in this embodiment, by an MCU (Micro Controller Unit), and in other embodiments, may be provided by other types of controllers. The charging gun is to be understood in a broad sense as an energy output port of the charging device, and its appearance is not limited to a gun type.
As shown in fig. 3, based on the charger 4, the present embodiment further provides a circuit verification method for determining whether the signal detection circuit 6 of the charger 4 is normal, where the circuit verification method includes:
s10, when the charger is not connected to a charging gun, periodically outputting a preset signal to the signal detection circuit 6 and periodically changing a circuit structure of the signal detection circuit 6, where the preset signal matches a control pilot signal of the charging gun;
s20, according to the preset signal, the signal detection circuit 6 generates a detection signal at its preset detection point;
s30 determining whether the signal detection circuit 6 is normal based on a deviation value between the signal at the preset detection point and the ideal signal;
and S40, when the charger is connected with a charging gun, the preset signal is stopped being output to the signal detection circuit 6.
It should be understood that the preset signal is matched with the control pilot signal of the charging gun, that is, the preset signal includes at least a part of the waveform that may appear during normal operation of the control pilot signal, and in this embodiment, the preset signal includes a signal with a fixed voltage value and a pulse width modulation signal. Further, the voltage value of the signal with the fixed voltage value is 12V, and the high level of the pulse width modulation signal is 12V. In other embodiments, the voltage may have other voltage values, and the voltage of the signal with the fixed voltage value and the high-level voltage of the pulse width modulation signal are not necessarily equal to each other. In other embodiments, the preset signal may further include other waveforms, and the specific waveform included in the preset signal is determined by the specific setting condition of the control pilot signal.
Accordingly, when the preset signal is determined, the specific form of the signal source generating circuit 5 can be set by a person skilled in the art according to common knowledge. In this embodiment, the signal source generating circuit 5 includes a three-state switching element, a first signal source and a second signal source, the first signal source is configured to output the signal with the fixed voltage value, and the second signal source is configured to output the pulse width modulation signal. The signal source generating circuit 5 switches between three states by the switching element, and outputs a signal of the fixed voltage value (for example, the fixed voltage value is +12V in this embodiment), outputs the pulse width modulation signal PWM, or outputs no signal (for example, outputs at 0V).
The ideal signal should be set according to actual conditions, and in the embodiment, the specific value of the ideal signal can be understood by referring to the values of CP _ out 1-4 in FIG. 4. In other embodiments, the ideal signal may be obtained by scaling according to a specific form of the circuit and a specific model of the preset signal.
In this embodiment, the preset detection point is the detection point 2 in fig. 2, and in other embodiments, the preset detection point may be disposed at another position of the signal detection circuit 6, or a plurality of preset detection points may be disposed. In step S30, the logic for determining whether the signal detection circuit 6 is normal according to the deviation value can be set according to actual needs, and the logic in this embodiment is described in detail in the following description.
The changing of the circuit structure of the signal detection circuit 6 may include changing parameters of elements in the circuit and/or connection modes of elements in the circuit, for example, by providing at least one switching element, and changing the circuit structure of the signal detection circuit 6 by adjusting the on/off state of the switching element; in other embodiments, the circuit structure of the signal detection circuit 6 may be changed by other types of actuators, such as a chip, a semiconductor element, and the like. By changing the circuit configuration of the signal detection circuit 6, the validity of the signal detection circuit 6 can be checked more comprehensively.
With the configuration, the reliability and the reasonableness of the control pilot signal can be effectively detected only by additionally adding one path of the signal source generating circuit 5 on hardware. For the charger 4 only needing to support unidirectional charging, only a little circuit cost needs to be added; for the charger 4 which needs to support bidirectional charging, referring to the definition of QCT (technical conditions of charging and discharging type motor controllers for electric vehicles) comments, the charger 4 needs to add the signal source generating circuit 5, that is, no hardware cost is increased. Only according to the flow shown in fig. 3, whether the signal detection circuit 6 works normally or not is checked, and then the signal detection circuit 6 is used for checking the control pilot signal, so that the rationality diagnosis requirement of the control pilot signal can be met.
Specifically, the signal detection circuit 6 includes a resistance value change switch 7, and as can be understood with reference to fig. 2, when the resistance value change switch 7 is switched from open to closed, the signal detection circuit 6 incorporates a resistor R2, at which time the resistance value of the signal detection circuit 6 becomes smaller. It is to be understood that this is only one possibility of changing the circuit configuration of the signal detection circuit 6, and in other embodiments, other solutions for changing the circuit configuration exist.
The step of periodically outputting a preset signal to the signal detection circuit 6 includes:
the following steps are performed periodically:
s11 turns off the resistance value changing switch 7, and outputs a signal of a fixed voltage value to the signal detection circuit 6;
s12 closes the resistance value changing switch 7, and outputs a signal of a fixed voltage value to the signal detection circuit 6;
s13 turns off the resistance value changing switch 7, and outputs a pulse width modulation signal to the signal detection circuit 6; and the number of the first and second groups,
s14 closes the resistance value changing switch 7, and outputs a pulse width modulation signal to the signal detection circuit 6.
It should be understood that the specific sequence of the above four steps can be changed arbitrarily without affecting the final verification effect.
Further, the step of determining whether the signal detection circuit 6 is normal based on the deviation value of the detection signal from the ideal signal includes:
determining whether the signal detection circuit 6 is normal based on at least one of the first deviation value, the second deviation value, the third deviation value, and the fourth deviation value;
the first deviation value is a deviation value of the detection signal and the ideal signal after the step S11 is performed; the second deviation value is a deviation value of the detection signal and the ideal signal after the step S12 is performed; the third deviation value is a deviation value of the detection signal and the ideal signal after the step S13 is performed; the fourth deviation value is a deviation value of the detection signal from the ideal signal after the execution of step S14.
With reference to the definition of the plausibility of the CP signal in each interactive state during the connection of the stub by the GBT 18487.1-2015, the control pilot signal under the above four operating conditions needs to be checked, and therefore, when the signal detection circuit 6 is checked, the above four operating conditions need to be covered. That is, in the present embodiment, whether the signal detection circuit 6 is normal is comprehensively determined based on the four of the first deviation value, the second deviation value, the third deviation value, and the fourth deviation value.
Specifically, the flow of the circuit verification method is shown in fig. 4. In fig. 4, the OBC is a short hand writing of an On Board Charger (On Board Charger), in this embodiment, the Charger 4 is an On Board Charger, and in other embodiments, the Charger 4 may be an off Board Charger.
In the circulation process, when the deviation between the output state and the read-back state of the control pilot signal is detected to exceed a reasonable range, the CP detects that a fault counter CP _ Det _ Cntr is added with 1, after the gun insertion connection is detected, the accumulated CP _ Det _ Cntr value is read back, if the value exceeds a limit value (the limit value can be set according to actual needs), the abnormity of a finished automobile signal detection circuit 6 is reported, and meanwhile, the counter is cleared by 0 (whether the charger 4 is allowed to be charged at the moment depends on the finished automobile strategy, and technicians in the field can set the counter according to the actual needs without detailed description); if the accumulated value CP _ Det _ Cntr is smaller than the limit value N, the charger 4 has no fault of the signal detection circuit 6, charging is allowed, the counter is cleared by 0 and written into the memory, cycle diagnosis is continuously carried out based on four states when the next driving cycle or the gun-unplugged state is detected, the accumulated value of the previous cycle is read from the memory, and the counter is continuously accumulated on the basis.
Preferably, in the step of periodically outputting the preset signal to the signal detection circuit 6, the period interval is greater than or equal to 8 seconds, and may also be selected to be 1 minute. The period interval should be calculated such that the interval of the start time or the end time of the same step is taken as the period interval. So configured, the service life of the signal detection circuit 6 can be extended.
Since the EVSE can simultaneously detect the voltage of the detection point 1 in fig. 2 after gun insertion, and the detection period is less than 50ms, in order to avoid that the preset signal output by the charger 4 itself affects the diagnosis of the EVSE on the detection point 1, S1 needs to be switched to 0V within 50ms of the detected CC and CP signals. Namely, when the charger is connected with a charging gun, the output of the preset signal to the signal detection circuit is stopped within 50 ms.
The embodiment also provides a signal verification method, which includes:
judging whether a signal detection circuit 6 of the charger is normal or not based on the circuit checking method;
if the signal detection circuit 6 is normal, whether a control guide signal of the charging gun is normal is judged based on the signal detection circuit 6.
That is, in order to determine whether the control pilot signal is normal, if the signal detection circuit 6 is normal, and if the signal detection circuit 6 is normal, the determination needs to be performed by the above circuit verification method.
The signal checking method is suitable for vehicle-mounted and non-battery chargers with different cooling types and different topologies, and is suitable for battery chargers running in a unidirectional or bidirectional mode.
The signal verification method is suitable for the charging mode and the connection mode of the CP circuit, such as GB/T AC charging containing CP signals, American and Japanese type1 AC or DC charging gun, European type2 AC or DC charging, American CCS1 AC or DC charging gun, European CCS2 DC or AC charging gun, and the like.
The embodiment further provides a vehicle, which includes the above-mentioned charger 4 and a controller, where the controller is configured to output a control signal to drive the signal source generating circuit 5 to periodically output the preset signal to the signal detecting circuit 6 when the charger 4 is not connected to the charging gun, and determine whether the signal detecting circuit 6 is normal according to a deviation value between a signal at a preset detection point of the signal detecting circuit 6 and an ideal signal.
The controller is further configured to determine whether the control pilot signal of the charging gun is normal based on the signal detection circuit 6 if the signal detection circuit 6 is normal.
Other elements and operating principles of the vehicle can be arranged by those skilled in the art according to the prior art and will not be described in detail here. The vehicle also has the beneficial effect of being able to detect whether the control pilot signal is normal.
In summary, in the circuit verification method, the signal verification method, the charger, and the vehicle provided in this embodiment, the circuit verification method includes: when the charger is not connected with a charging gun, a preset signal is periodically output to the signal detection circuit 6, and the preset signal is matched with a control guide signal of the charging gun; and judging whether the signal detection circuit 6 is normal or not based on a deviation value of a signal of a preset detection point of the signal detection circuit 6 and an ideal signal. With such a configuration, the verification of the signal detection circuit 6 can be completed with less circuit cost, and the control pilot signal can be verified based on the circuit cost, thereby solving the problem that the prior art lacks a method and a device for verifying whether the control pilot signal is normal or not.
The above description is only for the purpose of describing the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, and any variations and modifications made by those skilled in the art according to the above disclosure are within the scope of the present invention.
Claims (10)
1. A circuit checking method is characterized in that the method is used for judging whether a signal detection circuit of a charger is normal or not, and the circuit checking method comprises the following steps:
when the charger is not connected with a charging gun, periodically inputting a preset signal to the signal detection circuit, wherein the preset signal is matched with a control guide signal of the charging gun;
according to the preset signal, the signal detection circuit generates a detection signal at a preset detection point of the signal detection circuit; and the number of the first and second groups,
and judging whether the signal detection circuit is normal or not based on the deviation value of the detection signal and the ideal signal.
2. The circuit verification method of claim 1, wherein the predetermined signal comprises a fixed voltage value signal and a pulse width modulated signal.
3. The circuit verification method according to claim 1, wherein while outputting a preset signal to the signal detection circuit, the circuit verification method further comprises: the circuit configuration of the signal detection circuit is periodically changed.
4. The circuit verification method according to claim 2 or 3, wherein the signal detection circuit includes a resistance change switch, and the step of periodically inputting a preset signal to the signal detection circuit includes:
the following steps are performed periodically:
s11 turning off the resistance value changing switch, and outputting a signal of a fixed voltage value to the signal detection circuit;
s12 closing the resistance value changing switch to output a signal of a fixed voltage value to the signal detection circuit;
s13 turning off the resistance value changing switch, and outputting a pulse width modulation signal to the signal detection circuit; and the number of the first and second groups,
s14 closes the resistance change switch, outputting a pulse width modulation signal to the signal detection circuit.
5. The circuit verification method of claim 4, wherein the step of determining whether the signal detection circuit is normal based on the deviation value of the detection signal from the ideal signal comprises:
determining whether the signal detection circuit is normal based on at least one of the first deviation value, the second deviation value, the third deviation value, and the fourth deviation value;
the first deviation value is a deviation value of the detection signal and the ideal signal after the step S11 is performed; the second deviation value is a deviation value of the detection signal and the ideal signal after the step S12 is performed; the third deviation value is a deviation value of the detection signal and the ideal signal after the step S13 is performed; the fourth deviation value is a deviation value of the detection signal from the ideal signal after the execution of step S14.
6. The circuit verification method of claim 1, further comprising: and when the charger is connected with the charging gun, the preset signal is stopped being output to the signal detection circuit.
7. A signal verification method, comprising:
judging whether a signal detection circuit of a charger is normal or not based on the circuit checking method according to any one of claims 1-6;
and if the signal detection circuit is normal, judging whether the control guide signal of the charging gun is normal or not based on the signal detection circuit.
8. A charger is characterized by comprising a signal source generating circuit and a signal detecting circuit, wherein,
the signal source generating circuit is used for responding to a control signal and outputting a preset signal, and the preset signal is matched with a control guide signal of the charging gun;
the output end of the signal source generating circuit is connected with the input end of the signal detection circuit, so that the preset signal output by the signal source generating circuit is input to the signal detection circuit, and whether the signal detection circuit is normal or not is judged based on the preset signal.
9. A vehicle comprising the charger according to claim 8 and a controller, wherein the controller is configured to output a control signal to drive the signal source generating circuit to periodically input the preset signal to the signal detecting circuit when the charger is not connected to the charging gun, and to determine whether the signal detecting circuit is normal according to a deviation value between a signal at a preset detection point of the signal detecting circuit and an ideal signal, wherein the preset signal matches with a control pilot signal of the charging gun.
10. The vehicle of claim 9, wherein the controller is further configured to determine whether the control pilot signal of the charging gun is normal based on the signal detection circuit if the signal detection circuit is normal.
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