A control guidance circuit and method for vehicle-pile communication

Abstract

The present application discloses a control guidance circuit and method for vehicle-pile communication, which relates to the field of automobile charging technology. The circuit includes: a control confirmation line CP for connecting a power supply control device and a vehicle control device; a PWM wave output interface is provided on the power supply control device, and a first detection point is provided on the control confirmation line CP connected to one side of the power supply control device; a CP negative wave control circuit is provided on the control confirmation line CP connected to one side of the vehicle control device, and a second detection point is provided in the circuit; the power supply control device is used to control the output interface of the PWM wave to output a CP negative wave signal, and the second detection point is used to detect the negative wave voltage of the CP negative wave signal; the CP negative wave control circuit is used to control the electric vehicle to transmit the CP negative wave signal through the control confirmation line CP, and the first detection point is used to detect the negative wave voltage of the CP negative wave signal. The present application can realize two-way communication between the vehicle and the charging pile, and improve the charging efficiency and safety of the electric vehicle.

Description

Technical Field

[0001] The present application relates to the field of automobile charging technology, and in particular to a control and guidance circuit and method for vehicle-charging pile communication. Background Art

[0002] With the increasing popularity of new energy electric vehicles, charging stations are becoming increasingly common. AC charging stations are currently the mainstream choice due to their lower cost compared to DC charging stations. However, existing AC charging control and guidance circuits only support one-way communication between the vehicle and the charging station. However, achieving two-way communication between the vehicle and the charging station is a pressing technical challenge facing the industry, in order to improve charging efficiency and safety. Summary of the Invention

[0003] In response to the above technical problems, the embodiments of the present application provide a control and guidance circuit and method for vehicle-pile communication, which can realize two-way communication between the vehicle and the charging pile, and improve the charging efficiency and safety of electric vehicles.

[0004] The technical solution of this application is achieved as follows:

[0005] In a first aspect, an embodiment of the present application provides a control guidance circuit for vehicle-pile communication, comprising: a control confirmation line CP for connecting a power supply control device in a power supply device and a vehicle control device in an electric vehicle;

[0006] In the power supply device, the power supply control device is provided with an output interface for a pulse width modulation (PWM) wave, and a first detection point is provided on the control confirmation line CP connected to the power supply control device; in the electric vehicle, the control confirmation line CP connected to the vehicle control device is provided with a CP negative wave control circuit, and a second detection point is provided in the CP negative wave control circuit;

[0007] The power supply control device is used to control the output interface of the PWM wave to output a CP negative wave signal, and the second detection point is used to detect the negative wave voltage of the CP negative wave signal output by the output interface of the PWM wave;

[0008] The CP negative wave control circuit is used to control the electric vehicle to transmit a CP negative wave signal through the control confirmation line CP, and the first detection point is used to detect the negative wave voltage of the CP negative wave signal transmitted by the electric vehicle through the control confirmation line CP.

[0009] In some embodiments, the CP negative wave control circuit further includes a switch S4, a switch S5, a resistor R5, a resistor R6 and a diode D2;

[0010] The switch S4 includes a first end and a second end, the resistor R5 includes a third end and a fourth end, the switch S5 includes a fifth end and a sixth end, and the resistor R6 includes a seventh end and an eighth end;

[0011] The first end is connected to the control confirmation line CP, the second end is connected to the cathode of the diode D2, the third end and the fifth end are both connected to the anode of the diode D2, the sixth end is connected to the seventh end, and the fourth end and the eighth end are both grounded.

[0012] In some embodiments, the second detection point is located at a connection point between the anode of the diode D2 and the fifth end, and the second detection point is connected to the vehicle control device.

[0013] In some embodiments, the electric vehicle is further provided with a diode D1, a resistor R2, a resistor R3, and a switch S2, wherein the resistor R2 includes a ninth terminal and a tenth terminal, and the switch S2 includes an eleventh terminal and a twelfth terminal;

[0014] The anode of the diode D1 is connected to a first connection point, and the cathode of the diode D1 is connected to the vehicle control device. The first connection point is a connection point between the first end and the control confirmation line CP.

[0015] The ninth terminal is connected to the second connection point, the tenth terminal is connected to the eleventh terminal, the twelfth terminal is grounded, and the second connection point is located on the connection line between the cathode of the diode D1 and the vehicle control device;

[0016] One end of the resistor R3 is connected to the second connection point, and the other end of the resistor R3 is grounded.

[0017] In some embodiments, a third detection point is provided at the second connection point, and the third detection point is used to detect the maximum power supply current of the power supply device.

[0018] In some embodiments, the power supply device is further provided with a switch S1 and a resistor R1;

[0019] One end of the switch S1 is connected to the output interface of the pulse width modulation PWM wave, and the other end of the switch S1 is connected to one end of the resistor R1;

[0020] The other end of the resistor R1 is connected to the control confirmation line CP, and the first detection point is located at the connection point between the other end of the resistor R1 and the control confirmation line CP.

[0021] In a second aspect, an embodiment of the present application provides a control and guidance method for vehicle-pile communication, which is applied to the control and guidance circuit for vehicle-pile communication described in the first aspect. The method includes:

[0022] determining a negative wave voltage at the first detection point when it is determined that the power supply device sends a wake-up request signal to the electric vehicle, the wake-up request signal being a CP negative wave signal transmitted via the control confirmation line CP;

[0023] Based on the negative wave voltage at the first detection point, if it is determined that the electric vehicle supports a target communication mode, controlling the power supply device to establish a data link with the electric vehicle, wherein the target communication mode is a communication mode of transmitting the CP negative wave signal through the control confirmation line CP;

[0024] The power supply device and the electric vehicle are controlled to communicate based on the data link.

[0025] In some embodiments, controlling the power supply device and the electric vehicle to communicate based on the data link includes:

[0026] After determining that the data link requester sends a data link request to the data link requested party based on the data link, the data link requested party negatively responds to the data link request, controlling the data link requested party to resend the data link request based on the data link in priority to the data link requester;

[0027] The data link requester and the data link requested party are respectively one of the power supply equipment and the electric vehicle.

[0028] In some embodiments, controlling the power supply device and the electric vehicle to communicate based on the data link includes:

[0029] When it is determined that the power supply device and the electric vehicle simultaneously send data link requests based on the data link, the power supply device is controlled to resend the data link request based on the data link in priority to the electric vehicle.

[0030] In some embodiments, controlling the power supply device and the electric vehicle to communicate based on the data link includes:

[0031] When it is determined that the link data for communication between the power supply device and the electric vehicle based on the data link includes a set number of consecutive identical bits, the power supply device and / or the electric vehicle is controlled to add a target bit after the set number of consecutive identical bits and then send the link data, and the value of the target bit is opposite to the value of the set number of consecutive identical bits.

[0032] The control guidance circuit and method for vehicle-pile communication provided in the embodiment of the present application, on the one hand, by setting a CP negative wave control circuit in the electric vehicle, and the CP negative wave control circuit can control the electric vehicle to transmit the CP negative wave signal through the control confirmation line CP, and the first detection point in the power supply device can detect the negative wave voltage of the CP negative wave signal, thereby realizing the communication between the electric vehicle and the power supply device; on the other hand, the power supply control device in the power supply device controls the output interface of the PWM wave to output the CP negative wave signal, and the second detection point in the electric vehicle can detect the negative wave voltage of the CP negative wave signal, thereby realizing the communication between the power supply device and the electric vehicle. Therefore, the embodiment of the present application effectively realizes two-way communication between the electric vehicle and the power supply device, that is, realizes two-way communication between the vehicle and the pile, thereby improving the charging efficiency and safety of the electric vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0034] Figure 1 A schematic diagram of the structure of an AC charging control guide circuit provided in the related technology;

[0035] Figure 2 A schematic diagram of an AC charging connection control timing provided for related technologies;

[0036] Figure 3 A schematic diagram of a parallel switch control and guidance circuit for vehicle-pile communication provided in the related art;

[0037] Figure 4 A schematic diagram of the structure of a control and guidance circuit for vehicle-to-pile communication provided in an embodiment of the present application;

[0038] Figure 5 A flowchart of a control and guidance method for vehicle-pile communication provided in an embodiment of the present application;

[0039] Figure 6A schematic diagram of the vehicle-pile communication process provided in an embodiment of the present application. DETAILED DESCRIPTION

[0040] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0041] It should be noted that, in the description of the embodiments of the present application, the terms "first", "second", etc. are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of the same type, and the number of objects is not limited. For example, the first object can be one or more. In addition, in the description of the embodiments of the present application, "and / or" represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0042] In order to facilitate a clearer understanding of the embodiments of the present application, some related technologies are first introduced as follows.

[0043] In related technologies, the AC charging control guide circuit complies with the national standard charging interface standard. Figure 1 A schematic diagram of the structure of an AC charging control guide circuit provided in the related technology, such as Figure 1 As shown in the figure, the CC signal is the charging connection signal, and the CP signal is the charging control signal. The vehicle detects the RC resistor through the CC signal to determine the connection status of the charging gun. The power supply equipment (charging pile) sends a pulse width modulation wave (PWM) through the CP signal. After receiving the PWM wave, the electric vehicle adjusts the charging current according to the duty cycle of the PWM wave. Figure 2 A schematic diagram of AC charging connection control timing provided by related technology, such as Figure 2 As shown, the CP signal states sent by the charging pile include: 12v normal power and ±12v PWM wave; the peak voltage states detected by detection point 1 include: 12v, 9v and 6v, and the lowest voltage is -12v; the peak voltage states detected by detection point 2 include: 12v, 9v and 6v, and the lowest voltage is 0v.

[0044] In order to realize vehicle-pile communication, on the one hand, the relevant technology connects a switch in parallel at the vehicle end and the pile end respectively, and communicates through the opening and closing of the parallel switches. Figure 3 A schematic diagram of a parallel switch control guide circuit for vehicle-pile communication provided in the related art, such as Figure 3 As shown in Figure 1, on the CP signal line, the electric vehicle and the power supply equipment are connected in parallel with a switch respectively, and communication is carried out by opening and closing the switch Sc and the switch Sv during the charging process. However, this technology has the following defects: (1) poor compatibility, the old charging pile is not compatible with the new car, and the new charging pile is not compatible with the old car; (2) during the communication during the charging process, due to the closure of the switch Sc, it will affect the vehicle end's reading of the PWM wave duty cycle and amplitude of the CP signal, resulting in the vehicle being unable to quickly respond to the current control of the charging pile, and when the vehicle encounters an emergency, it is unable to quickly notify the charging pile to disconnect the 220V AC voltage. On the other hand, the related technology realizes the one-way transmission of information from the vehicle to the charging pile by opening and closing the switch S2, and communication can only be carried out before charging, because if S2 is disconnected during the charging process, the charging pile will regard it as a request from the vehicle to stop charging.

[0045] Therefore, in order to overcome at least some of the above-mentioned defects of the relevant technology, the embodiment of the present application provides a control guidance circuit and method for vehicle-pile communication, which can not only realize two-way communication between the vehicle and the pile, but also be backward compatible. The electric vehicle in the embodiment of the present application is compatible with the existing standard charging pile, and the charging pile in the embodiment of the present application is compatible with the existing standard electric vehicle.

[0046] The following is an illustrative introduction to the parallel switch control guidance circuit and method for vehicle-pile communication provided in the embodiments of the present application in conjunction with the drawings in the embodiments of the present application.

[0047] Figure 4 This is a schematic diagram of a control and guidance circuit for vehicle-pile communication provided in an embodiment of the present application, such as Figure 4 As shown, the control guidance circuit includes: a control confirmation line CP for connecting the power supply control device in the power supply equipment and the vehicle control device in the electric vehicle;

[0048] In the power supply device, the power supply control device is provided with an output interface for a pulse width modulation (PWM) wave, and a first detection point is provided on the control confirmation line CP connected to the power supply control device; in the electric vehicle, the control confirmation line CP connected to the vehicle control device is provided with a CP negative wave control circuit, and a second detection point is provided in the CP negative wave control circuit;

[0049] The power supply control device is used to control the output interface of the PWM wave to output a CP negative wave signal, and the second detection point is used to detect the negative wave voltage of the CP negative wave signal output by the output interface of the PWM wave;

[0050] The CP negative wave control circuit is used to control the electric vehicle to transmit a CP negative wave signal through the control confirmation line CP, and the first detection point is used to detect the negative wave voltage of the CP negative wave signal transmitted by the electric vehicle through the control confirmation line CP.

[0051] It should be noted that the power supply device in the embodiment of the present application can be a charging pile, which is compatible with the existing standard vehicle charging interface, and the electric vehicle can be charged with the existing standard charging pile.

[0052] It should be noted that the control confirmation line CP is used to transmit the CP signal between the power supply equipment and the electric vehicle to determine and control the charging state and charging current.

[0053] It should be noted that the power supply control device in the power supply equipment is provided with a PWM wave output interface, which is used to output the PWM wave. After the electric vehicle receives the PWM wave, it adjusts the charging current according to the duty cycle of the PWM wave.

[0054] It should be noted that the CP negative wave signal in the embodiment of the present application is a negative wave signal in the CP signal transmitted on the control confirmation line CP, and the CP negative wave control circuit controls the negative wave signal in the CP signal transmitted on the control confirmation line CP.

[0055] It should be noted that the CP signal is a control and guidance signal primarily used to monitor the interaction between electric vehicles and power supply equipment. It can be understood as a handshake signal between the electric vehicle and the power supply equipment. The negative wave is a form of the CP signal, which is used to transmit information between the electric vehicle and the power supply equipment.

[0056] In an embodiment of the present application, within an electric vehicle, a CP undercurrent control circuit is provided on a control confirmation line CP connected to one side of the vehicle control device. This CP undercurrent control circuit is used to control the electric vehicle to transmit a CP undercurrent signal via the control confirmation line CP. Furthermore, a second detection point is provided within the CP undercurrent control circuit for detecting the undercurrent voltage of the CP undercurrent signal output by the PWM wave output interface. Furthermore, the undercurrent voltage of the CP undercurrent signal transmitted by the electric vehicle via the control confirmation line CP is detected by a first detection point within the power supply device.

[0057] It should be noted that the embodiment of the present application adds a CP negative wave control circuit on the vehicle side, and the CP negative wave control circuit can control the electric vehicle to transmit the CP negative wave signal through the control confirmation line CP, and the first detection point in the power supply equipment can detect the negative wave voltage of the CP negative wave signal, thereby realizing the communication between the electric vehicle and the power supply equipment; and the power supply control device in the power supply equipment controls the output interface of the PWM wave to output the CP negative wave signal, and the second detection point in the electric vehicle can detect the negative wave voltage of the CP negative wave signal, thereby realizing the communication between the power supply equipment and the electric vehicle.

[0058] It can be understood that the control guidance circuit for vehicle-pile communication provided in the embodiment of the present application, on the one hand, by setting a CP negative wave control circuit in the electric vehicle, and the CP negative wave control circuit can control the electric vehicle to transmit the CP negative wave signal through the control confirmation line CP, and the first detection point in the power supply device can detect the negative wave voltage of the CP negative wave signal, thereby realizing the communication between the electric vehicle and the power supply device; on the other hand, the power supply control device in the power supply device controls the output interface of the PWM wave to output the CP negative wave signal, and the second detection point in the electric vehicle can detect the negative wave voltage of the CP negative wave signal, thereby realizing the communication between the power supply device and the electric vehicle. Therefore, the embodiment of the present application effectively realizes two-way communication between the electric vehicle and the power supply device, that is, realizes two-way communication between the vehicle and the pile, thereby improving the charging efficiency and safety of the electric vehicle.

[0059] In some embodiments, as Figure 4 As shown, the CP negative wave control circuit is further provided with a switch S4, a switch S5, a resistor R5, a resistor R6 and a diode D2;

[0060] The switch S4 includes a first end and a second end, the resistor R5 includes a third end and a fourth end, the switch S5 includes a fifth end and a sixth end, and the resistor R6 includes a seventh end and an eighth end;

[0061] The first end is connected to the control confirmation line CP, the second end is connected to the cathode of the diode D2, the third end and the fifth end are both connected to the anode of the diode D2, the sixth end is connected to the seventh end, and the fourth end and the eighth end are both grounded.

[0062] It can be understood that the embodiment of the present application adds switch S4, switch S5, resistor R5, resistor R6, diode D2 and a second detection point on the basis of the AC charging control pilot circuit to form a CP negative wave control circuit.

[0063] It should be noted that the resistance values of the resistors R5 and R6 can be adaptively set based on specific applications, and are not specifically limited in this embodiment of the present application. For example, the resistance value of the resistor R5 is 2740Ω, and the resistance value of the resistor R6 is 1300Ω.

[0064] It should be noted that the control and guidance circuit for vehicle-pile communication provided in the embodiment of the present application is an effective implementation of the physical layer of vehicle-pile bidirectional communication.

[0065] When the power supply device sends a signal to the electric vehicle, the electric vehicle closes switches S4 and S5 in the pre-state, and the power supply device switches switch S1 to a PWM wave in the pre-state. When the power supply device needs to send a physical layer logic signal 0 to the electric vehicle, the power supply device's PWM negative wave transmission voltage is 0V, and the electric vehicle's second detection point voltage is 0V. When the power supply device needs to send a physical layer logic signal 1 to the electric vehicle, the power supply device's PWM negative wave transmission voltage is -12V, and the electric vehicle's second detection point voltage is -6V, as shown in Table 1.

[0066] Table 1

[0067]

[0068] It should be noted that the pile end (power supply equipment) can control the minimum voltage of the PWM wave of the CP signal. In communication, it can be the 0v voltage value newly added in the embodiment of the present application, or other voltage values between 0v and -12v.

[0069] When an electric vehicle sends a signal to a power supply, the electric vehicle closes switch S4 in the pre-conditioning state, and the power supply switches S1 to a PWM wave in the pre-conditioning state, with a negative voltage of -12V. When the electric vehicle needs to send a physical layer logic signal of 0 to the power supply, the electric vehicle controls switch S5 to be open, and the negative voltage of the power supply's first detection point is -9V. When the electric vehicle needs to send a physical layer logic signal of 1 to the power supply, the electric vehicle controls switch S5 to be closed, and the negative voltage of the power supply's first detection point is -6V, as shown in Table 2.

[0070] Table 2

[0071]

[0072]

[0073] It can be understood that the embodiment of the present application can effectively realize the physical layer logic signal transmission of bidirectional communication between the vehicle and the pile by opening and closing the switch S4 and the switch S5 in the CP negative wave control circuit and controlling the negative wave voltage of the PWM wave.

[0074] In some embodiments, as Figure 4As shown, the second detection point is located at the connection point between the anode of the diode D2 and the fifth end, and the second detection point is connected to the vehicle control device.

[0075] It can be understood that, in the embodiment of the present application, by setting the second detection point at the connection point between the anode of the diode D2 and the fifth end of the switch S5, the voltage detected by the second detection point can effectively reflect the PWM negative wave sending voltage of the power supply device.

[0076] In some embodiments, as Figure 4 As shown, the electric vehicle is further provided with a diode D1, a resistor R2, a resistor R3 and a switch S2, the resistor R2 includes a ninth terminal and a tenth terminal, and the switch S2 includes an eleventh terminal and a twelfth terminal;

[0077] The anode of the diode D1 is connected to a first connection point, and the cathode of the diode D1 is connected to the vehicle control device. The first connection point is a connection point between the first end and the control confirmation line CP.

[0078] The ninth terminal is connected to the second connection point, the tenth terminal is connected to the eleventh terminal, the twelfth terminal is grounded, and the second connection point is located on the connection line between the cathode of the diode D1 and the vehicle control device;

[0079] One end of the resistor R3 is connected to the second connection point, and the other end of the resistor R3 is grounded.

[0080] It should be noted that the ground terminals of the switch S2 and the resistor R3 are the ground wire PE.

[0081] It should be noted that the switch S2 is located inside the electric vehicle and is used to confirm whether the electric vehicle is ready for charging; when the electric vehicle meets the charging conditions, the switch S2 is closed.

[0082] In some embodiments, the switch S2 may be a normally closed switch, serving as a control pilot circuit switch within the electric vehicle.

[0083] It should be noted that the diode has a unidirectional conductive characteristic. In the embodiment of the present application, the control confirmation line CP is connected to the vehicle control device through the diode D1, and the diode D1 can play an anti-reverse connection role in this control guidance circuit.

[0084] It should be noted that the resistance values of the resistor R2 and the resistor R3 can be set to calibrated values or adaptively set based on actual applications, and the embodiments of the present application do not specifically limit this.

[0085] In some embodiments, as Figure 4As shown, a third detection point is provided at the second connection point, and the third detection point is used to detect the maximum power supply current of the power supply device.

[0086] It should be noted that, after the electric vehicle establishes an electrical connection with the power supply device, the vehicle control device determines the maximum supply current of the power supply device by judging the duty cycle of the PWM wave at the third detection point.

[0087] In some embodiments, the vehicle control device compares the maximum power supply current currently provided by the power supply equipment, the rated input current of the on-board charger in the electric vehicle, and the rated capacity of the cable, and sets the minimum value as the current maximum allowable input current of the on-board charger.

[0088] In some embodiments, as Figure 4 As shown, the power supply device is further provided with a switch S1 and a resistor R1;

[0089] One end of the switch S1 is connected to the output interface of the pulse width modulation PWM wave, and the other end of the switch S1 is connected to one end of the resistor R1;

[0090] The other end of the resistor R1 is connected to the control confirmation line CP, and the first detection point is located at the connection point between the other end of the resistor R1 and the control confirmation line CP.

[0091] It should be noted that the resistor R1 in the embodiment of the present application is an equivalent resistor, which is a parameter that simulates the actual resistance in the circuit and affects the magnitude of the current flow. The smaller the equivalent resistance, the greater the current allowed to flow.

[0092] It can be understood that, in the embodiment of the present application, by setting the first detection point at the connection point between the resistor R1 and the control confirmation line CP, the negative wave voltage detected by the first detection point can effectively reflect the negative wave voltage of the CP negative wave signal transmitted by the electric vehicle through the control confirmation line CP.

[0093] Figure 5 This is a flow chart of a control and guidance method for vehicle-pile communication provided in an embodiment of the present application. The control and guidance method is applied to the control and guidance circuit for vehicle-pile communication described above, such as Figure 5 As shown, the control guidance method includes:

[0094] S501: Determine the negative wave voltage of the first detection point when it is determined that the power supply device sends a wake-up request signal to the electric vehicle, and the wake-up request signal is a CP negative wave signal transmitted through the control confirmation line CP.

[0095] It should be noted that, in the embodiment of the present application, the control and guidance circuit for vehicle-pile communication described above is used as the physical layer for vehicle-pile bidirectional communication, and a data link layer protocol is established on the basis of the physical layer.

[0096] It should be noted that when the charging gun is not inserted into the electric vehicle, the switches S4 and S5 in the electric vehicle are in the open state. After the charging gun is inserted into the electric vehicle, the switches S4 and S5 are closed.

[0097] In some embodiments, after the power supply device recognizes that the charging gun is inserted into the electric vehicle and receives the card swipe signal, it sends a wake-up request signal 01010101... to the electric vehicle through the control confirmation line CP, and stops sending after a set length of time (for example, 3 seconds), and at the same time determines the negative wave voltage of the first detection point. When the negative wave voltage of the first detection point is 0v / -12v / 0v / -12v / 0v / -12v / 0v / -12v..., it can be determined that the electric vehicle does not support the communication method of transmitting the CP negative wave signal; when the negative wave voltage of the first detection point is 0v / -6v / 0v / -6v / 0v / -6v / 0v / -6v..., it can be determined that the electric vehicle supports the communication method of transmitting the CP negative wave signal.

[0098] S502. Based on the negative wave voltage at the first detection point, when it is determined that the electric vehicle supports a target communication mode, control the power supply device and the electric vehicle to establish a data link, where the target communication mode is a communication mode of transmitting the CP negative wave signal through the control confirmation line CP.

[0099] In this embodiment of the present application, the negative voltage at the first detection point can be used to determine whether the electric vehicle supports the target communication mode, which is a communication mode that transmits a CP negative signal via the control confirmation line CP. For example, if the power supply device sends a wake-up request signal 01010101... to the electric vehicle via the control confirmation line CP, and the negative voltage at the first detection point is determined to be 0v / -6v / 0v / -6v / 0v / -6v / 0v / -6v..., it can be determined that the electric vehicle supports the communication mode that transmits CP negative signals. The power supply device can then be controlled to establish a data link with the electric vehicle.

[0100] In some embodiments, after determining that the electric vehicle supports the communication method of transmitting the CP negative wave signal, the power supply device can be controlled to be set to 1 (physical layer logical signal), and then the electric vehicle can be controlled to send a 01010101 response after a set time (for example, 10 milliseconds), and then set to 1. The power supply device and the electric vehicle confirm that the data link is established and wait for communication requests.

[0101] S503: Control the power supply device and the electric vehicle to communicate based on the data link.

[0102] In an embodiment of the present application, after determining that a data link is established between the power supply device and the electric vehicle, the power supply device and the electric vehicle can be controlled to communicate based on the data link.

[0103] In some embodiments, after the data link is established between the power supply device and the electric vehicle, the requester (power supply device or electric vehicle) actively initiates a data link request, sends 00010001, and then sets it to 1. The requested party (electric vehicle or power supply device) affirmatively responds 00010001, and then sets it to 1. At this time, the requester and the requested party complete the data link request and enter the data link transmission and reception stage.

[0104] It can be understood that the embodiment of the present application uses the control guidance circuit for vehicle-pile communication described above as the physical layer of vehicle-pile two-way communication, and establishes a data link layer protocol on the basis of this physical layer, which can effectively realize two-way communication between electric vehicles and power supply equipment, thereby improving the charging efficiency and safety of electric vehicles.

[0105] In some embodiments, controlling the power supply device and the electric vehicle to communicate based on the data link includes:

[0106] After determining that the data link requester sends a data link request to the data link requested party based on the data link, the data link requested party negatively responds to the data link request, controlling the data link requested party to resend the data link request based on the data link in priority to the data link requester;

[0107] The data link requester and the data link requested party are respectively one of the power supply equipment and the electric vehicle.

[0108] It should be noted that both the electric vehicle and the power supply equipment can act as data link requesters to make data link requests. If the electric vehicle is the data link requester, the power supply equipment is the data link requestee; if the power supply equipment is the data link requester, the electric vehicle is the data link requestee.

[0109] In some embodiments, if an electric vehicle proactively initiates a data link request by sending 00010001 and then setting it to 1, and the power supply device responds negatively with 00010000 and then sets it to 1, the electric vehicle (data link requester) waits for a first set time (e.g., 100ms) before resending the data link request, and the power supply device (data link requestee) waits for a second set time (e.g., 10ms) before resending the data link request. It should be noted that the first set time here is greater than the second set time, that is, the data link requestee has priority over the data link requester in making a data link request.

[0110] It can be understood that the embodiment of the present application can avoid conflicts between the data link requester and the data link requested party due to simultaneous data link requests by giving the data link requested party the right to request the data link first when it is determined that the data link requested party denies responding to the data link request.

[0111] In some embodiments, controlling the power supply device and the electric vehicle to communicate based on the data link includes:

[0112] When it is determined that the power supply device and the electric vehicle simultaneously send data link requests based on the data link, the power supply device is controlled to resend the data link request based on the data link in priority to the electric vehicle.

[0113] In an embodiment of the present application, when it is determined that the power supply equipment and the electric vehicle simultaneously send data link requests based on the data link, the power supply equipment is given the right to request the data link first, which can avoid conflicts between the power supply equipment and the electric vehicle due to simultaneous data link requests.

[0114] It is understandable that if the power supply equipment and the electric vehicle send data link requests at the same time, during the sending process, the first detection point and the second detection point will detect a voltage of 0V. At this time, the power supply equipment can be set to send priority, and the power supply equipment can be controlled to continue sending data link requests, and the electric vehicle can be controlled to stop sending data link requests.

[0115] In some embodiments, controlling the power supply device and the electric vehicle to communicate based on the data link includes:

[0116] When it is determined that the link data for communication between the power supply device and the electric vehicle based on the data link includes a set number of consecutive identical bits, the power supply device and / or the electric vehicle is controlled to add a target bit after the set number of consecutive identical bits and then send the link data, and the value of the target bit is opposite to the value of the set number of consecutive identical bits.

[0117] In the embodiment of the present application, data padding is required during the link data transmission and reception process. That is, if the link data transmitted between the power supply device and the electric vehicle includes a set number of consecutive identical bits, a target bit is added after the set number of consecutive identical bits before transmission. The value of the target bit is opposite to the value of the set number of consecutive identical bits. For example, if the values of the set number of consecutive identical bits are all 1, the value of the target bit is 0; if the values of the set number of consecutive identical bits are all 0, the value of the target bit is 1.

[0118] It should be noted that the set number can be adaptively set based on actual applications, and the embodiments of the present application do not specifically limit this. For example, the set number is 8. That is, every time 8 consecutive 0 bits or 8 consecutive 1 bits are encountered, an invalid reverse bit (bit) needs to be added after the 8 consecutive bits. For example: if the target sends 1,0000,0000 bits, then 10,0000,0001 needs to be sent; for another example: if the target sends 0,1111,1111 bits, then 01,1111,1110 needs to be sent.

[0119] It should be noted that when parsing at the receiving end, the last invalid reverse bit needs to be discarded. After the link data is sent and received, the data sender sets it to 1 and no longer fills the bit.

[0120] In some embodiments, within a set time (e.g., 10ms) after completing a data link request, the data link requester can send 0010 + an 8-bit application service number + an 8-bit data length + a specified length of data, where the application service number can be up to 255 bits (0-255) and the data length is 0-255 bits. Data padding is required during link data transmission and reception.

[0121] It should be noted that the application service number is the application service number of the application layer.

[0122] In some embodiments, after link data transmission is completed, the sender needs to wait at least 100 bits or 100ms before continuing to send a data link service request, and the receiver needs to wait at least 10 bits or 10ms before continuing to send a data link service request. That is, the sender has priority over the receiver in making data link requests.

[0123] For example, Figure 6 A schematic diagram of a vehicle-pile communication process provided in an embodiment of the present application is shown as follows: Figure 6 As shown, the communication process includes: data link establishment, data link request and data link sending.

[0124] Regarding data link establishment, the electric vehicle detects the insertion of a charging plug and closes switches S4 and S5. After confirming the card swipe, the power supply device transmits a wake-up service signal using the CP negative wave signal 01010101... for 3 seconds. If the negative wave voltage at the first detection point is determined to be 0v / -12v / 0v / -12v / 0v / -12v / 0v / -12v..., the electric vehicle is determined not to support the communication method for transmitting CP negative wave signals. If the negative wave voltage at the first detection point is determined to be 0v / -6v / 0v / -6v / 0v / -6v / 0v / -6v..., the electric vehicle is determined to support the communication method for transmitting CP negative wave signals. The power supply device then sets the signal to 1. 10ms later, the electric vehicle sends a response signal 01010101, and then sets the signal to 1. At this point, the power supply device and the electric vehicle confirm the establishment of the data link and await a data link request.

[0125] Regarding the data link request, after the power supply equipment and the electric vehicle complete the establishment of the data link, the data link requester (power supply equipment or electric vehicle) actively initiates the data link request 00010001, and then sets it to 1. The data link requested party (electric vehicle or power supply equipment) affirmatively responds 00010001, and then sets it to 1. At this time, the data link requester and the data link requested party complete the data link request.

[0126] Regarding data link transmission, within 10ms after completing the data link request, the data link requester can send 0010 + 8-bit application service number + 8-bit data length + specified length data. It should be noted that data padding is required during data link transmission.

[0127] It should be noted that Figure 6 The vehicle-pile communication process shown is only an example and is not intended to limit the embodiments of the present application. The power supply device and the electric vehicle can also communicate through other signals that can perform handshake interaction.

[0128] It is understandable that the embodiment of the present application establishes a data link layer protocol based on the AC charging control guidance circuit including the CP negative wave control circuit, so that the application layer establishes a service number, so that the vehicle pile can perform two-way communication before, during and after charging. Moreover, the communication mechanism is backward compatible, so that the electric vehicle in the embodiment of the present application is compatible with the existing standard charging pile, and the charging pile in the embodiment of the present application is compatible with the existing standard electric vehicle. It is also low-cost, and only the CP negative wave control circuit needs to be added on the vehicle side, and the PWM wave low-voltage end 0v / -12v switching of the CP signal needs to be supported on the pile side.

[0129] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, i.e., they may be located in one place or distributed across multiple network units. Some or all of the modules may be selected based on actual needs to achieve the objectives of the present embodiment. Persons of ordinary skill in the art will be able to understand and implement the present invention without inventive effort.

[0130] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the embodiments of the present application may take the form of hardware embodiments, software embodiments, or embodiments combining software and hardware. Furthermore, the embodiments of the present application may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage and optical storage, etc.) containing computer-usable program code.

[0131] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the steps in the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0132] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0133] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0134] The above description is merely an optional embodiment of the present application and is not intended to limit the scope of protection of the present application.

Claims

1. A control and guidance method for vehicle-pile communication, characterized in that: Applied to a control guidance circuit, the control guidance circuit includes a control confirmation line CP for connecting a power supply control device in a power supply device and a vehicle control device in an electric vehicle; In the power supply device, the power supply control device is provided with an output interface for a pulse width modulation (PWM) wave, and a first detection point is provided on the control confirmation line CP connected to the power supply control device; in the electric vehicle, the control confirmation line CP connected to the vehicle control device is provided with a CP negative wave control circuit, and a second detection point is provided in the CP negative wave control circuit; The power supply control device is used to control the output interface of the PWM wave to output a CP negative wave signal, and the second detection point is used to detect the negative wave voltage of the CP negative wave signal output by the output interface of the PWM wave; The CP negative wave control circuit is used to control the electric vehicle to transmit a CP negative wave signal through the control confirmation line CP; the first detection point is used to detect the negative wave voltage of the CP negative wave signal transmitted by the electric vehicle through the control confirmation line CP; The CP negative wave control circuit is further provided with a switch S4, a switch S5, a resistor R5, a resistor R6 and a diode D2; The switch S4 includes a first end and a second end, the resistor R5 includes a third end and a fourth end, the switch S5 includes a fifth end and a sixth end, and the resistor R6 includes a seventh end and an eighth end; The first end is connected to the control confirmation line CP, the second end is connected to the cathode of the diode D2, the third end and the fifth end are both connected to the anode of the diode D2, the sixth end is connected to the seventh end, and the fourth end and the eighth end are both grounded; The method comprises: determining a negative wave voltage at the first detection point when it is determined that the power supply device sends a wake-up request signal to the electric vehicle, the wake-up request signal being a CP negative wave signal transmitted via the control confirmation line CP; When it is determined that the negative wave voltage at the first detection point alternates between 0V and -6V, it is determined that the electric vehicle supports the target communication mode; when it is determined that the negative wave voltage at the first detection point alternates between 0V and -12V, it is determined that the electric vehicle does not support the target communication mode; Based on the negative wave voltage at the first detection point, if it is determined that the electric vehicle supports the target communication mode, controlling the power supply device and the electric vehicle to establish a data link, wherein the target communication mode is a communication mode of transmitting the CP negative wave signal through the control confirmation line CP; controlling the power supply device and the electric vehicle to communicate based on the data link; The controlling the power supply device and the electric vehicle to communicate based on the data link includes: When it is determined that the link data for communication between the power supply device and the electric vehicle based on the data link includes a set number of consecutive identical bits, the power supply device and / or the electric vehicle is controlled to add a target bit after the set number of consecutive identical bits and then send the link data, and the value of the target bit is opposite to the value of the set number of consecutive identical bits.

2. The control and guidance method for vehicle-pile communication according to claim 1, characterized in that: The controlling the power supply device and the electric vehicle to communicate based on the data link includes: After determining that the data link requester sends a data link request to the data link requested party based on the data link, the data link requested party negatively responds to the data link request, controlling the data link requested party to resend the data link request based on the data link in priority to the data link requester; The data link requester and the data link requested party are respectively one of the power supply equipment and the electric vehicle.

3. The control and guidance method for vehicle-pile communication according to claim 1, characterized in that: The controlling the power supply device and the electric vehicle to communicate based on the data link includes: When it is determined that the power supply device and the electric vehicle simultaneously send data link requests based on the data link, the power supply device is controlled to resend the data link request based on the data link in priority to the electric vehicle.

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