A device for collecting fuel gun signals

Abstract

The present invention relates to a device for collecting fuel gun signals, which comprises a signal collection unit, a signal conversion unit, a main control unit and a communication unit; the signal collection unit comprises an input end connected to a fuel gun status signal output end to collect the fuel gun status signal in real time, and divides the fuel gun status signal into two paths: one signal is connected to a fuel dispenser mainboard to provide the fuel dispenser mainboard with a signal of the same type as the fuel gun status signal sent by the fuel gun, so there is no need to modify the existing fuel dispenser, and the adaptability is strong; at the same time, after the other signal is input into the signal conversion unit, the fuel gun status signal is converted into a level signal and input into the main control unit, thereby eliminating interference and improving reliability.

Description

Technical Field

[0001] The invention relates to the technical field of oil and gas recovery monitoring at a gas station, and in particular to a gas gun signal acquisition device for stably acquiring a gas gun lifting signal and a gas gun hanging signal. Background Art

[0002] At present, there are two methods for the gas station secondary oil and gas recovery monitoring system (hereinafter referred to as the monitoring system) to monitor the completion of a refueling:

[0003] 1. Use the method of monitoring pulse signals. This method uses a flow sensor to convert the oil flow during refueling into a pulse signal. The pulse signal output end of the flow sensor is connected to the main board of the fuel dispenser, and the pulse signal is input into the main board of the fuel dispenser. The main board of the fuel dispenser determines whether a refueling is completed by detecting the generation and disappearance of the pulse signal. For a fuel dispenser with a pulse signal, when the fuel gun is in the state of lifting the gun, a level signal in a low level state will be provided. When the main board of the fuel dispenser receives a low level signal, the fuel dispenser equipment will be started and ready for refueling. When the monitoring system obtains a low level signal, it determines that the fuel gun is in the state of lifting the gun, that is, a refueling starts. When the fuel gun is in the state of hanging the gun, a level signal in a high level state will be provided. When the main board of the fuel dispenser receives a high level signal, it shuts down the fuel dispenser equipment and stops refueling. When the monitoring system obtains a high level signal, it determines that the fuel gun is in the state of hanging the gun, that is, a refueling is completed.

[0004] 2. Use the method of monitoring the solenoid valve signal. In this method, the solenoid valve is located between the fuel gun and the fuel pump. The solenoid valve is provided with contacts for controlling the start and stop of the fuel pump. The contacts are connected to the fuel dispenser mainboard. The fuel dispenser mainboard determines whether a refueling is completed by detecting the closing or disconnection of the solenoid valve contacts. In the existing fuel dispenser using the solenoid valve signal method, when the fuel gun is in the gun-raising state, a closed switch signal will be provided; when the fuel dispenser mainboard receives a closed switch signal, the fuel dispenser equipment will be started and refueling will be prepared; when the monitoring system obtains a low-level signal, it will determine that the fuel gun is in the gun-raising state, that is, a refueling has begun; when the fuel gun is in the gun-hanging state, a disconnected switch signal will be provided, and the fuel dispenser mainboard will receive a disconnected switch signal, shut down the fuel dispenser equipment, and stop refueling.

[0005] 3. Use the level signal method. In this method, usually, when the fuel gun is in the state of lifting the gun, a level signal of a low level state will be provided; the fuel dispenser mainboard receives a low level signal, starts the fuel dispenser equipment, and prepares for refueling; when the monitoring system obtains the low level signal, it determines that the fuel gun is in the state of lifting the gun, that is, a refueling starts; when the fuel gun is in the state of hanging the gun, a level signal of a high level state will be provided; the fuel dispenser mainboard receives a high level signal, shuts down the fuel dispenser equipment, and stops refueling; when the monitoring system obtains the high level signal, it determines that the fuel gun is in the state of hanging the gun, that is, a refueling ends.

[0006] The above monitoring method has many problems during the refueling process due to human or mechanical reasons:

[0007] 1. During the refueling process, when refueling is paused, the pulse signal or solenoid valve signal is interrupted (i.e., a false refueling end error signal is generated). At this time, the monitoring system mistakenly believes that one refueling is over and saves the relevant refueling information; when refueling continues, the pulse signal or solenoid valve signal is regenerated (i.e., a false refueling start error signal is generated). At this time, the monitoring system mistakenly believes that a new refueling has started, and re-records the relevant refueling information after clearing, causing the monitoring system to mistakenly judge two refuelings as one refueling. From a theoretical analysis, the method of using monitoring pulse signals or solenoid valve signals to determine whether a refueling is completed cannot fundamentally avoid the occurrence of the above problems.

[0008] 2. The fuel gun signal has various signal types (including switch signals, level signals) and signal strengths due to different types of fuel dispensers. As a result, frequent failures occur during the refueling process due to the inability to obtain the fuel gun signal normally. For example, during a refueling process, the monitoring system failed to obtain the gun lifting signal normally due to the weak fuel gun signal. The monitoring system mistakenly believed that refueling had not started and failed to monitor the relevant refueling information in time, resulting in delayed and disordered refueling information. For another example, the monitoring system failed to obtain the gun hanging signal normally due to the weak fuel gun signal and mistakenly believed that refueling had not ended. When the second refueling started, the relevant refueling information continued to be accumulated, causing the monitoring system to mistakenly judge two refuelings as one refueling.

[0009] In view of the current diversity and strength of fuel gun signals, the inability to normally obtain fuel gun signals and cause frequent failures, there is an urgent need to provide a stable and reliable fuel gun signal acquisition device. Summary of the invention

[0010] The purpose of the present invention is to provide a fueling gun signal acquisition device with strong compatibility and stable and reliable acquisition of fueling gun lifting and hanging signals in view of the above-mentioned deficiencies in the prior art.

[0011] To achieve the above-mentioned purpose, the present invention discloses a device for collecting fuel gun signals, which is characterized by comprising a power supply unit, a signal collection unit and a signal conversion unit, as well as a pair of signal input terminals connected to a fuel gun status signal output terminal and a pair of fuel gun status signal output terminals connected to an external fuel dispenser mainboard; the signal collection unit is provided with an input terminal connected to a fuel gun status signal output terminal of a fuel gun to collect fuel gun status signals in real time, and divides the fuel gun status signals into two paths: one signal path is connected to a fuel dispenser mainboard to provide the fuel dispenser mainboard with a fuel gun status signal of the same type as the collected signal in real time, and the other signal path is input to the signal conversion unit, and the signal conversion unit converts the fuel gun status signal into a standard signal output; the power supply unit provides a DC working power supply Vcc for the signal collection unit and the signal conversion unit.

[0012] Compared with the prior art, the gas gun signal collection device of the present invention is provided with a signal collection unit, a signal conversion unit, a main control unit and a communication unit; the signal collection unit is provided with an input end connected to the gas gun status signal output end to collect the gas gun status signal in real time, and divides the gas gun status signal into two paths: one signal is connected to the gas station mainboard to provide the gas station mainboard with a signal of the same type as the gas gun status signal sent by the gas gun collected in real time, so there is no need to modify the existing gas station, and the adaptability is strong; at the same time, after the other signal is input into the signal conversion unit, the gas gun status signal is converted into a level signal and input into the main control unit, thereby eliminating interference and improving reliability.

[0013] As a further configuration of the present invention, the pair of signal input terminals are connected with the pair of fuel gun status signal output terminals to form a transmission path for the same type of fuel gun status signal; the signal acquisition unit includes a second switching transistor Q2, a base current limiting resistor R3 and a second load resistor R4, the collector of the second switching transistor Q2 is connected to the positive electrode of the DC working power supply Vcc through the second load resistor R4, the emitter of the second switching transistor Q2 is connected to the signal cathode input terminal and the negative electrode of the DC working power supply Vcc, the base is connected to the signal cathode input terminal through the base current limiting resistor R3, and the collector is the output terminal of the signal acquisition unit to form another transmission path for the fuel gun status signal; the signal conversion unit is composed of a level conversion circuit.

[0014] As a further configuration of the present invention, the signal conversion unit includes an upper bias resistor R1, a first load resistor R2, and a first switching transistor Q1. The collector of the first switching transistor Q1 is connected to the positive electrode of the DC working power supply Vcc through the first load resistor R2, the emitter is connected to the negative electrode of the DC working power supply Vcc, the base is connected to the collector of the second switching transistor Q2 through the upper bias resistor R1, and is connected to the positive electrode of the DC working power supply Vcc through the second load resistor R4. The collector of the first switching transistor Q1 constitutes the output end of the signal conversion unit.

[0015] As a further configuration of the present invention, the signal acquisition unit includes a relay K1; two ends of the normally open contact of the relay K1 are respectively connected to two ends of the pair of fuel gun status signal output ends to form a path for transmitting the same type of fuel gun status signal, one signal input end point of the pair of signal input ends is connected to the positive pole of the DC working power supply Vcc, one end of the relay K1 coil is connected to the negative pole of the DC working power supply Vcc, and the other end is connected to the other signal input end point of the pair of signal input ends, and the other signal input end point is also the output end of the signal acquisition unit to form another path for transmitting the fuel gun status signal; the signal conversion unit is composed of a conversion circuit that converts the switch contact signal into a level signal.

[0016] As a further configuration of the present invention, the signal conversion unit includes an upper bias resistor R1, a first load resistor R2 and a first switching transistor Q1, the collector of the first switching transistor Q1 is connected to the positive electrode of the DC working power supply Vcc through the first load resistor R2, the emitter is connected to the negative electrode of the DC working power supply Vcc, and the base is connected to the other signal input terminal of the pair of signal input terminals through the upper bias resistor R1, and the collector of the first switching transistor Q1 constitutes the output terminal of the signal conversion unit.

[0017] As a further configuration of the present invention, the fuel gun signal collection device is also provided with a main control unit, and the output end of the signal conversion unit is connected to the main control unit to convert the fuel gun status signal into a standard signal and input it into the main control unit.

[0018] As a further configuration of the present invention, the gas gun signal collection device is also provided with a communication unit, and the main control unit processes the input transformed gas gun status signal and inputs it into the communication unit, and the gas pump information is transmitted to an external monitoring system through the communication unit.

[0019] As a further configuration of the present invention, the gas gun signal collection device is also provided with a shell, and each unit circuit is arranged in the shell. The shell is provided with three outlets, for the pair of gas gun status signal output ends, the pair of gas gun status signal output ends connected to the external gas station mainboard and the output end of the signal conversion unit to pass through respectively.

[0020] As a further configuration of the present invention, the gas gun signal collection device is also provided with a shell, and each unit circuit is arranged in the shell. The shell is provided with three outlets, for the pair of gas gun status signal output terminals, the pair of gas gun status signal output terminals connected to the external gas station mainboard and the output terminal of the communication unit to pass through respectively.

[0021] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a principle block diagram of a specific embodiment of the present invention;

[0023] Figure 2 This is a circuit diagram of a specific embodiment 1 of the present invention;

[0024] Figure 3 This is a circuit diagram of a specific embodiment 2 of the present invention;

[0025] Figure 4 A circuit diagram of a specific embodiment of a communication unit of the present invention;

[0026] Figure 5 This is a circuit diagram of a specific embodiment of a power supply unit of the present invention;

[0027] Figure 6 This is a schematic diagram of the appearance of a specific embodiment of the housing of the present invention;

[0028] Figure 7 It is a cross-sectional view of the internal local structure of a specific embodiment of the shell of the present invention. DETAILED DESCRIPTION

[0029] like Figure 1As shown, the gas gun signal collection device of the present invention includes a power supply unit, a signal collection unit and a signal conversion unit, as well as a pair of signal input terminals for connecting to the gas gun status signal output terminals and a pair of gas gun status signal output terminals connected to the external gas station mainboard. The signal collection unit is provided with an input terminal connected to the gas gun status signal output terminal of the gas gun to collect the gas gun status signal in real time, and divide the gas gun status signal into two paths: one signal is connected to the gas station mainboard to provide the gas station mainboard with a gas gun status signal of the same type as the collected signal (i.e., the unprocessed original level signal or the processed switch signal of the same type), and the other signal is input to the signal conversion unit, and the signal conversion unit converts the gas gun status signal into a standard signal (such as a digital level signal or a switch contact signal, a switch quantity signal); the gas gun status signal output terminal can be a pulse signal, a level signal or a switch contact signal; Figure 5 As shown, the power supply unit uses a three-terminal voltage regulator chip T1 and a filter capacitor to form a voltage-stabilized DC power supply circuit, and the power supply unit provides a DC working power supply Vcc for the signal acquisition unit and the signal conversion unit.

[0030] In order to enable those skilled in the art to better understand the present application, the following will be combined with the preferred embodiments of the present application and the accompanying drawings to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application. Specific embodiment 1

[0032] like Figure 2As shown, in this specific embodiment, the gas gun signal acquisition device includes a power supply unit, a signal acquisition unit and a signal conversion unit. The pair of signal input terminals (signal positive and negative input terminals, respectively) are connected with the pair of gas gun status signal output terminals to form a transmission path for the same type of gas gun status signal; the signal conversion unit is composed of a level conversion circuit, that is, converting the input level within a certain range into a unified high level output, and converting the input low level below a certain range into a unified low level output, and of course, it can also be the opposite. In this specific embodiment, the signal acquisition unit includes a second switch transistor Q2, a base current limiting resistor R3 and a second load resistor R4. The second switch transistor Q2 is an NPN type. The collector of the second switch transistor Q2 is connected to the positive electrode of the DC working power supply Vcc through the second load resistor R4. The emitter of the second switch transistor Q2 is connected to the negative electrode input terminal of the signal and the negative electrode of the DC working power supply Vcc. The base is connected to the positive electrode input terminal of the signal through the base current limiting resistor R3. The collector is the output end of the signal acquisition unit and constitutes another path for the transmission of the fuel gun status signal; the signal conversion unit includes an upper bias resistor R1, a first load resistor R2, a filter capacitor C5 and a first switch transistor Q1. The first switch transistor The transistor Q1 is of NPN type, the collector of the first switch transistor Q1 is connected to the positive electrode of the DC working power supply Vcc through the first load resistor R2, the emitter is connected to the negative electrode of the DC working power supply Vcc, the base is connected to the collector of the second switch transistor Q2 through the upper bias resistor R1, and is connected to the positive electrode of the DC working power supply Vcc through the second load resistor R4 to form a level conversion circuit with the switch transistor as the core (of course, the first switch transistor Q1 can also be of PNP type), the collector of the first switch transistor Q1 constitutes the output end of the signal conversion unit, in order to improve the anti-interference ability, it is preferred that the base of the first switch transistor Q1 is provided with another path to be connected to the negative electrode of the DC working power supply Vcc through the filter capacitor C5.

[0033] The signal acquisition device of the fuel gun is suitable for fuel pumps with pulse signals and level signals. When the fuel gun of the fuel pump with level signals is in the state of raising the gun, it will provide a level signal in a low level state; the fuel pump mainboard receives a low level signal, starts the fuel pump equipment, and prepares for refueling; when the monitoring system obtains the low level signal, it determines that the fuel gun is in the state of raising the gun, that is, a refueling starts; when the fuel gun is in the state of hanging the gun, it will provide a level signal in a high level state; the fuel pump mainboard receives a high level signal, shuts down the fuel pump equipment, and stops refueling; when the monitoring system obtains the high level signal, it determines that the fuel gun is in the state of hanging the gun, that is, a refueling ends.

[0034] In order to be able to more reliably transmit the fuel dispenser information to the external monitoring system, the fuel dispenser gun signal collection device is preferably further provided with a main control unit and a communication unit. The output end of the signal conversion unit is connected to the main control unit. In this specific embodiment, the collector of the first switching transistor Q1 constitutes the output end of the signal conversion unit connected to the main control unit. The main control unit processes the input transformed fuel dispenser gun status signal and inputs it to the communication unit. Through the communication unit, the fuel dispenser information is transmitted to the external monitoring system; the main control unit is composed of a data processing circuit composed of a microprocessor and its peripheral components; the communication unit is composed of a dedicated communication integrated chip and its peripheral components, such as Figure 4 As shown, in this specific embodiment, a 485 communication chip can be selected to obtain more reliable transmission characteristics.

[0035] In order to facilitate use, installation and maintenance, the fuel gun signal collection device is preferably further provided with a housing 1, and each unit circuit is arranged in the housing 1, such as Figure 6 , 7 As shown, the shell is provided with three outlets: a fuel gun connection port 101, a fuel dispenser connection port 102 and a communication connection port 103, for the pair of fuel gun status signal output terminals, the pair of fuel gun status signal output terminals connected to an external fuel dispenser mainboard and the output terminal of the signal conversion unit or (communication unit signal line) to pass through respectively.

[0036] The specific working principle of the fuel gun signal collection device is as follows:

[0037] When the gun is lifted, the pair of signal input terminals (connector J4) input a low-level signal, and the input low-level signal is directly transmitted to the pair of fuel gun status signal output terminals (connector J6), that is, directly outputting the same type of fuel gun status signal as the fuel dispenser mainboard, that is, outputting a low-level signal, and the fuel dispenser mainboard starts the fuel dispenser equipment and prepares for refueling; at the same time, the other path of the input low-level signal is transmitted to the base of the second switch transistor Q2 through the base current limiting resistor R3. Using the NPN transistor characteristics, the second switch transistor Q2 is cut off at this time, and the collector is high. The high level of the collector of the second switch transistor Q2 is transmitted to the base pin of the first switch transistor Q1 through the upper bias resistor R1. At this time, the first switch transistor Q1 is turned on, and the fuel gun status signal input terminal (input port S_OG) of the main control unit is pulled down from the original high level to a low level signal. The main control unit determines that refueling has started, and sends the relevant information to the monitoring system through the communication unit through the data transmission interface J8, so that the monitoring system can stably obtain the fuel gun lifting signal and determine the start of refueling.

[0038] When the fueling gun is hung back, the pair of signal input terminals (connector J4) input a high-level signal, and the input high-level signal is directly transmitted to the pair of fueling gun status signal output terminals (connector J6), that is, directly outputting the same type of fueling gun status signal as the fueling machine mainboard, that is, outputting a high-level signal, and the fueling machine mainboard shuts down the fueling machine equipment and stops refueling; at the same time, the other path of the input high-level signal is transmitted to the base of the second switch transistor Q2 through the base current limiting resistor R3, and the second switch transistor Q2 is turned on, and the collector is low. The low level of the collector of the second switch transistor Q2 is transmitted to the base pin of the first switch transistor Q1 through the upper bias resistor R1, and the first switch transistor Q1 is turned off, and the input port S_OG of the main control unit is pulled from the original low level to the high level signal, and the main control unit determines that the refueling is finished, and sends the relevant information to the monitoring system through the communication unit through the data transmission interface J8, so that the monitoring system can stably obtain the hanging gun signal of the fueling gun and determine that a refueling is finished. Specific embodiment 2

[0040] like Figure 3 As shown, in this specific embodiment, the device for collecting fuel gun signals includes a power supply unit, a signal collection unit and a signal conversion unit. The signal collection unit circuit includes a relay K1 and a freewheeling diode D1; the two ends of the normally open contact of the relay K1 are respectively connected to the two ends of the pair of fuel gun status signal output ends to form a transmission path of the same type of fuel gun status signal, one signal input end point of the pair of signal input ends is connected to the positive pole of the DC working power supply Vcc, one end of the relay K1 coil is connected to the negative pole of the DC working power supply Vcc, and the other end is connected to the other signal input end point of the pair of signal input ends, and the other signal input end point is also the output end of the signal collection unit to form another transmission path of the fuel gun status signal, and the freewheeling diode D1 is connected in parallel to the two ends of the relay K1 coil; the signal conversion unit is composed of a conversion circuit that converts the switch contact signal into a level signal.

[0041] In this specific embodiment, the signal conversion unit includes an upper bias resistor R1, a first load resistor R2, a filter capacitor C5 and a first switch transistor Q1, the first switch transistor Q1 is an NPN type, the collector of the first switch transistor Q1 is connected to the positive electrode of the DC working power supply Vcc through the first load resistor R2, the emitter is connected to the negative electrode of the DC working power supply Vcc, the base is connected to the other signal input terminal of the pair of signal input terminals through the upper bias resistor R1 to form a level conversion circuit with the switch transistor as the core, and the collector of the first switch transistor Q1 constitutes the output end of the signal conversion unit. In order to improve the anti-interference ability, it is preferred that the base of the first switch transistor Q1 is provided with another path through the filter capacitor C5 and the negative electrode of the DC working power supply Vcc.

[0042] The signal collection device of the fuel gun is suitable for fuel dispensers with solenoid valve signals. Normally, when the fuel gun is in the gun-raising state, the solenoid valve will provide a switch signal in a closed state; the fuel dispenser mainboard receives a closed switch signal, starts the fuel dispenser equipment, and prepares for refueling; the monitoring system obtains a low-level signal and determines that the fuel gun is in the gun-raising state, that is, a refueling session has begun; when the fuel gun is in the gun-hanging state, the solenoid valve will provide a switch signal in a disconnected state; the fuel dispenser mainboard receives a disconnected switch signal, shuts down the fuel dispenser equipment, and stops refueling; when the monitoring system obtains a high-level signal, it determines that the fuel gun is in the gun-hanging state, that is, a refueling session has ended.

[0043] In order to be able to more reliably transmit the fuel dispenser information to the external monitoring system, the fuel dispenser gun signal collection device is preferably further provided with a main control unit and a communication unit. The output end of the signal conversion unit is connected to the main control unit. In this specific embodiment, the collector of the first switching transistor Q1 constitutes the output end of the signal conversion unit and is connected to the main control unit. The fuel dispenser gun status signal is converted into a standard signal and input into the main control unit. The main control unit processes the input transformed fuel dispenser gun status signal and inputs it into the communication unit. The fuel dispenser information is transmitted to the external monitoring system through the communication unit.

[0044] The main control unit is composed of a data processing circuit composed of a microprocessor and its peripheral components; the communication unit is composed of a dedicated communication integrated chip and its peripheral components, such as Figure 4 As shown, in this specific embodiment, a 485 communication chip can be selected to obtain more reliable transmission characteristics.

[0045] In order to facilitate use, installation and maintenance, the fuel gun signal collection device is preferably further provided with a housing 1, and each unit circuit is arranged in the housing 1, such as Figure 6 , 7 As shown, the shell is provided with three outlets: a fuel gun connection port 101, a fuel dispenser connection port 102 and a communication connection port 103, for the pair of fuel gun status signal output terminals, the pair of fuel gun status signal output terminals connected to an external fuel dispenser mainboard and the output terminal of the signal conversion unit or (communication unit signal line) to pass through respectively.

[0046] The specific working principle of the fuel gun signal collection device is as follows:

[0047] When the fueling gun is lifted, a switch signal in a closed state is received between the pair of signal input terminals (pins 1 and 2 of connector J2), that is, pin 1 of J2 is at a high level of the power supply VCC, and the control coil between pins 1 and 2 of relay K1 is energized, so that the switch between the normally open contacts 3 and 5 of relay K1 changes from normally open to normally closed state, and the pair of fueling gun state signal output terminals (connector J3) are controlled by the states of the normally open contacts 3 and 5 of relay K1, and the pair of fueling gun state signal output terminals (connector J3) output a switch signal in a closed state, and output the same type of signal of the fueling gun to the fuel dispenser mainboard, that is, the same type of closed switch signal after processing, and the fuel dispenser mainboard starts the fuel dispenser equipment and prepares for refueling;

[0048] At the same time, the high-level signal on pin 1 of the pair of signal input terminals (pins 1 and 2 of connector J2) is transmitted to the base pin of the first switch transistor Q1 through the upper bias resistor R1. At this time, the first switch transistor Q1 is turned on, and the fuel gun status signal input terminal (input port S_OG) of the main control unit is pulled down from the original high level to a low level signal. The main control unit determines that refueling has started, and sends the relevant information to the monitoring system through the communication unit and the data transmission interface J8, so that the monitoring system can stably obtain the fuel gun lifting signal and determine the start of refueling.

[0049] When the fuel gun is hung back, a switch signal in a disconnected state is received between the pair of signal input terminals (pins 1 and 2 of connector J2), that is, pin 1 of J2 is disconnected from the power supply VCC, and the control coil between pins 1 and 2 of relay K1 loses power, so that the switch between the normally open contacts 3 and 5 of relay K1 changes from closed to open state. The pair of fuel gun status signal output terminals (connector J3) are controlled by the states of the normally open contacts 3 and 5 of relay K1. The pair of fuel gun status signal output terminals (connector J3) output a switch signal in a disconnected state and output the same type of signal of the fuel gun to the fuel dispenser mainboard. That is, it is the same type of disconnect switch signal after processing. The mainboard of the fuel dispenser shuts down the fuel dispenser equipment and stops refueling. At the same time, since the No. 1 pin of the pair of signal input terminals (No. 1 and No. 2 pins of connector J2) is a low-level signal at this time, it is transmitted to the base pin of the first switch transistor Q1 through the upper bias resistor R1. At this time, the first switch transistor Q1 is cut off, and the input port S_OG of the main control unit is pulled up from the original low level to a high-low level signal. The main control unit determines that refueling is finished, and sends the relevant information to the monitoring system through the communication unit through the data transmission interface J8, so that the monitoring system can stably obtain the hanging gun signal of the fuel gun and determine that refueling is finished.

[0050] The above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the present invention.

Claims

1. A device for collecting fuel gun signals, characterized in that: It includes a power supply unit, a signal acquisition unit and a signal conversion unit, as well as a pair of signal input terminals connected to the fuel gun status signal output terminal and a pair of fuel gun status signal output terminals connected to the external fuel dispenser mainboard; the signal acquisition unit is provided with an input terminal connected to the fuel gun status signal output terminal of the fuel gun to collect the fuel gun status signal in real time, and divide the fuel gun status signal into two paths: one signal path is connected to the fuel dispenser mainboard to provide the fuel dispenser mainboard with a fuel gun status signal of the same type as the collected signal in real time, and the other signal path is input to the signal conversion unit, and the signal conversion unit converts the fuel gun status signal into a standard signal output; the power supply unit provides a DC working power supply for the signal acquisition unit and the signal conversion unit; the pair of signal input terminals are connected to the pair of fuel gun status signal output terminals to form one path for transmitting the fuel gun status signal of the same type; the signal acquisition unit includes a second switching transistor, a base current limiting transistor, and a second switching transistor. The signal conversion unit comprises a first load resistor and a second load resistor, the collector of the second switch transistor is connected to the positive electrode of the DC working power supply through the second load resistor, the emitter of the second switch transistor is connected to the negative electrode input terminal of the signal and the negative electrode of the DC working power supply, the base is connected to the positive electrode input terminal of the signal through the base current limiting resistor, and the collector is the output terminal of the signal acquisition unit to constitute another path for the transmission of the fuel gun status signal; the signal conversion unit is composed of a level conversion circuit; the signal conversion unit includes an upper bias resistor, a first load resistor and a first switch transistor, the collector of the first switch transistor is connected to the positive electrode of the DC working power supply through the first load resistor, the emitter is connected to the negative electrode of the DC working power supply, the base is connected to the collector of the second switch transistor through the upper bias resistor, and at the same time is connected to the positive electrode of the DC working power supply through the second load resistor, and the collector of the first switch transistor constitutes the output terminal of the signal conversion unit.

2. The device for collecting fuel gun signals according to claim 1, characterized in that: The fuel gun signal collection device is also provided with a main control unit, and the output end of the signal conversion unit is connected to the main control unit to convert the fuel gun status signal into a standard signal and input it into the main control unit.

3. The device for collecting fuel gun signals according to claim 2, characterized in that: The fuel gun signal collection device is also provided with a communication unit. The main control unit processes the transformed fuel gun status signal and inputs it into the communication unit. The fuel gun status information is transmitted to an external monitoring system through the communication unit.

4. The device for collecting fuel gun signals according to claim 2, characterized in that: The gas gun signal collection device is also provided with a shell, and each unit circuit is arranged in the shell. The shell is provided with three outlets, for the pair of signal input ends connected to the gas gun status signal output end, the pair of gas gun status signal output ends connected to the external gas station mainboard and the output end of the signal conversion unit to pass through respectively.

5. The device for collecting fuel gun signals according to claim 3, characterized in that: The gas gun signal collection device is also provided with a shell, and each unit circuit is arranged in the shell. The shell is provided with three outlets, for the pair of signal input ends connected to the gas gun status signal output end, the pair of gas gun status signal output ends connected to the external gas station mainboard and the output end of the communication unit to pass through respectively.

6. A device for collecting fuel gun signals, characterized in that: The invention comprises a power supply unit, a signal acquisition unit and a signal conversion unit, as well as a pair of signal input terminals connected to the fuel gun status signal output terminal and a pair of fuel gun status signal output terminals connected to the external fuel dispenser mainboard; the signal acquisition unit is provided with an input terminal connected to the fuel gun status signal output terminal of the fuel dispenser to collect the fuel gun status signal in real time, and divide the fuel gun status signal into two paths: one signal path is connected to the fuel dispenser mainboard to provide the fuel dispenser mainboard with a fuel gun status signal of the same type as the collected signal in real time, and the other signal path is input to the signal conversion unit, and the signal conversion unit converts the fuel gun status signal into a standard signal output; the power supply unit provides a DC working power supply to the signal acquisition unit and the signal conversion unit; the signal acquisition unit comprises a relay; the two ends of the normally open contact of the relay are respectively connected to the two end points of the pair of fuel gun status signal output terminals to form the same type of fuel dispenser One path for transmitting the gun status signal, one signal input terminal of the pair of signal input terminals is connected to the positive electrode of the DC working power supply, one end of the relay coil is connected to the negative electrode of the DC working power supply, and the other end is connected to the other signal input terminal of the pair of signal input terminals, and the other signal input terminal is also the output end of the signal acquisition unit to constitute another path for transmitting the status signal of the refueling gun; the signal conversion unit is composed of a conversion circuit that converts the switch contact signal into a level signal; the signal conversion unit includes an upper bias resistor, a first load resistor and a first switching transistor, the collector of the first switching transistor is connected to the positive electrode of the DC working power supply through the first load resistor, the emitter is connected to the negative electrode of the DC working power supply, the base is connected to the other signal input terminal of the pair of signal input terminals through the upper bias resistor, and the collector of the first switching transistor constitutes the output end of the signal conversion unit.

7. The device for collecting fuel gun signals according to claim 6, characterized in that: The fuel gun signal collection device is also provided with a main control unit, and the output end of the signal conversion unit is connected to the main control unit to convert the fuel gun status signal into a standard signal and input it into the main control unit.

8. The device for collecting fuel gun signals according to claim 7, characterized in that: The fuel gun signal collection device is also provided with a communication unit. The main control unit processes the transformed fuel gun status signal and inputs it into the communication unit. The fuel gun status information is transmitted to an external monitoring system through the communication unit.

9. The device for collecting fuel gun signals according to claim 6, characterized in that: The gas gun signal collection device is also provided with a shell, and each unit circuit is arranged in the shell. The shell is provided with three outlets, for the pair of signal input ends connected to the gas gun status signal output end, the pair of gas gun status signal output ends connected to the external gas station mainboard and the output end of the signal conversion unit to pass through respectively.

10. The device for collecting fuel gun signals according to claim 8, characterized in that: The gas gun signal collection device is also provided with a shell, and each unit circuit is arranged in the shell. The shell is provided with three outlets, for the pair of signal input ends connected to the gas gun status signal output end, the pair of gas gun status signal output ends connected to the external gas station mainboard and the output end of the communication unit to pass through respectively.

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