Patent Publication Number: US-10316815-B2

Title: Device having communication with small gasoline engine igniter

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This present application is a Continuation Application of PCT application No. PCT/CN2015/075151 filed on Mar. 26, 2015, which claims priority to Chinese Patent Application No. 201410850798.9 filed on Dec. 30, 2014, the contents of which are hereby incorporated by reference. 
    
    
     FIELD OF THE INVENTION 
     The present invention relates to a small gasoline engine igniter, which is applied to small gasoline internal combustion engines, such as mowers, brush cutters, hedge trimmers, chain saws in the garden tool field, and in particular, to a device having communication with small gasoline engine igniter. 
     BACKGROUND OF THE INVENTION 
     The traditional small digital igniters for gasoline engines adopt MCU as the core control unit, to provide appropriate ignition signals for the normal operation of a gasoline engine. It can identify the shutdown signals through a flameout port connected to an external flameout switch, to stop a running engine. However, it needs external interfaces to achieve operations of controlling MCU internal data of the igniter, such as reading, modifying, etc., and the circuit is very complicated. 
     SUMMARY OF THE INVENTION 
     Specific to the above technical problems, the present invention discloses a device having communication with small gasoline engine igniter to achieve single-wire bidirectional communication with the igniters of a small gasoline engine. 
     In order to solve the above technical problems, the invention adopts the following technical solutions: 
     A device having communication with small gasoline engine igniter, comprising an igniter, a flameout switch and a communication device, and both the flameout switch and the communication device are connected to an igniter flameout port and an iron core of a reference ground. 
     Further, the igniter comprises an igniter MCU control chip circuit, an igniter data input circuit connected to the data input terminal P 3  of igniter MCU control chip circuit, an igniter data output circuit connected to the data output terminal P 4  of igniter MCU control chip circuit, and an igniter charging and energy storage circuit that supplies power for the igniter MCU control chip circuit, igniter data input circuit and igniter data output circuit. 
     Further, the communication device comprises a central control circuit of communication device, a control data receiving circuit connected to a data receiving terminal P 7  of central control circuit of communication device, and a control data output circuit connected to a data transmitting terminal P 8  of central control circuit of communication device. 
     Further, the igniter charging and energy storage circuit comprises a resistor R 21 , a capacitor C 21 , a diode D 22  and a diode D 21 , an external power supply is connected to one end of the resistor R 21 , capacitor C 21  and the negative end of the diode D 22 , and another end of resistor R 21  is connected to the negative end of the diode D 22  and the power source end of MCU control chip, another end of capacitor C 21  and the positive end of diode D 21  are grounded, and the positive end of diode D 22  is connected to a flameout port. 
     Further, the igniter data input circuit comprises a resistor R 22 , a capacitor C 22  and a diode D 23 , one end of resistor R 22  is connected to the power source end of MCU control chip, another end of resistor R 22  is connected to data input terminal P 3  of MCU control chip, one end of capacitor C 22  is connected to the positive end of diode D 23 , and another end of capacitor C 22  is grounded, and the negative end of diode D 23  is connected to a flameout port. 
     Further, the igniter data output circuit comprises a resistor R 23 , a resistor R 24 , a transistor Q 21 , the data output terminal P 4  of igniter MCU control chip circuit is connected to one end of resistor R 23  and resistor R 24 , another end of resistor R 23  is connected to a base of transistor Q 21 , another end of resistor R 24  is connected to an emitter of transistor Q 21 , the emitter of transistor Q 21  is grounded and a collector is connected to a flameout port. 
     Further, comprising a power circuit, a voltage regulator circuit, a display circuit and a keying circuit, wherein the power circuit is connected to the voltage regulator circuit to supply power for the central control circuit of communication device, and the display circuit and the keying circuit are connected to and controlled by the central control circuit of communication device. 
     Further, the control data receiving circuit comprises a resistor R 32 , a diode D 31  and a capacitor C 31 , the data receiving terminal P 7  of central control circuit of communication device is connected to an end of resistor R 32 , the positive end of diode D 31  and one end of capacitor C 31 , another end of capacitor C 31  is grounded, another end of resistor R 32  is connected to the output end of the voltage regulator circuit, the negative end of diode D 31  is connected to a flameout port, and the power circuit is connected to the flameout port after passing through resistor R 31 . 
     Further, the control data output circuit comprises a resistor R 33 , a resistor R 34  and a transistor, the data transmitting terminal P 8  of central control circuit of communication device is connected to one end of resistor R 33 , resistor R 34 , another end of resistor R 33  is connected to a base of the transistor, another end of resistor R 34  is connected to an emitter of the transistor, and the emitter of the transistor is grounded, and a collector of the transistor is connected to a flameout port. 
     The invention can achieve the following beneficial effects: compared to traditional circuits, the present invention designs a different circuit to achieve data communications. The unique voltage conversion circuit herein makes the signals at MUC sampling port more close to the required theoretical value, to ensure more stable and reliable communications. The design of key input and data display enables the communication device to be used alone without additional computers or other additional equipments, simple and convenient. On the basis of above igniter program, very simple circuit at extremely low costs is added, together with the MCU control program, the invention can have a single-wire bidirectional communication with an external device, so as to achieve operations of controlling MCU internal data of the igniter, such as reading, modifying, etc. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a schematic diagram of the invention; 
         FIG. 2  is a simplified diagram the structure of the invention; 
         FIG. 3  is a circuit diagram of an igniter in the invention; 
         FIG. 4  is a circuit diagram of a communication device in the invention; 
         FIG. 5  is a voltage waveform example of main reference points. 
     
    
    
     DETAILED DESCRIPTION OF THE EMBODIMENTS 
     The invention is further described in combination with drawings and specific embodiments. 
     The present invention designs a device having communication with small gasoline engine igniter, which can achieve single-wire bidirectional data communication with a small gasoline engine igniter. The igniter uses a MCU as the control center, providing ignition signals for the working of engine. The igniter has a flameout port and the reference ground wire, which are connected to an external flameout switch, to achieve the flameout shutdown of an engine. The igniter has two working power supplies: a. an alternating magnetic field generated by flywheel rotations on the surface closest to igniter core embedded with magnetic steels, making the coils inside the igniter to generate an induced voltage; or b. an external power supply that is connected to the igniter through the flameout port and the reference ground wire. 
     The igniter comprises an igniter data input circuit, igniter data output circuit and external power receiving circuit. The igniter data input circuit, igniter data output circuit and external power receiving circuit are all connected to the flameout port. The communication device comprises a power circuit, which may be a battery, a power adapter, or a power circuit that can generate a stable DC voltage. 
     The communication device comprises a control data receiving circuit, a control data output circuit and a power supply circuit. The control data receiving circuit, control data output circuit and power supply circuit has a common connection port. The common connection port is connected to the flameout port of igniter. 
     The communication device comprises a display circuit, which may be an LCD, an LED, or other display device that can display information, to display the required data. 
     The communication device comprises a key input circuit, which can achieve the information input of communication device by human. 
     Referring to  FIG. 1  and  FIG. 2 , the small gasoline engine  4  comprises many components, and the components related to the invention are the igniter  1  and flameout switch  3 . The two ends of the flameout switch  3  are connected to the flameout port  9  of the igniter  1  and the iron core  5  of the reference ground respectively, to input the shutdown signals to the igniter  1  to control the gasoline engine  4  to stop running. The communication device  2  are connected to the flameout port  9  of the igniter  1  and the iron core  5  of the reference ground through the connecting wire P 1  and connecting wire P 2 , respectively, to achieve single-wire bidirectional data communications with the igniter  1 . The communication device  2  comprises the power circuit  8 , keying circuit  7  and display circuit  6 , and the power circuit  8  can provide energy to all circuits of the communication device  2  and provide energy for the working of igniter  1  through connecting wire P 1  and connecting wire P 2 . Operators can perform parameters and functions setting of the communication device  2  through the keying circuit  7 , and then the communication device  2  will visually display the related information through the display circuit  6 . 
       FIG. 3  depicts the igniter circuit  20  inside igniter  1  related to internal communication functions, comprising a MUC control chip U 21 , and its internal storage of data and procedure control igniter  1  to achieve ignition output, flameout sampling and two-way data communications with communication device  2 . The connection point P 5  is the flameout port  9  in  FIG. 1 ; 3 completely independent functional circuits, working power charging and energy storage circuit  21 , igniter data input circuit  22  and igniter data output circuit  23  are connected in the igniter circuit  20 . The working power charging and energy storage circuit  21  provides energy for all components in the igniter circuit  20 . The positive voltage applied into the connection point P 5  can charge the capacitor C 21  through the diode D 22 . The voltage stored on the capacitor C 21  is connected to the VCC pin after voltage stabilization through the resistor R 21  and the voltage-regulator diode D 21 , to provide energy for MUC control chip U 21 . The igniter data input circuit  22  comprises a resistor R 22 , a capacitor C 22  and a diode D 23 . When the voltage on the connection point P 5  is “1”, the voltage on the data input terminal P 3  is pulled up to VCC 1  (also “1”) by the resistor R 22 ; when the voltage on the connection point P 5  is “0”, the voltage on the data input terminal P 3  is pulled down to “0” after connected to the connection point P 5  through the diode D 23 . The igniter data output circuit  23  comprises a resistor R 23 , a resistor R 24  and a transistor Q 21 . When the output of the data output terminal P 4  is “1”, a high voltage drives the conduction between c pin and e pin of the transistor Q 21  through the resistor R 23 , to make the voltage on the connection point P 5  is pulled to almost the same as that of the connection point P 6 , which is “0”; when the output of the data output terminal P 4  is “0”, the control electrode b of the transistor Q 21  is pulled to GND (i.e. “0”) of MUC control chip U 21  through resistor R 23  and resistor R 24 , unable to achieve conduction between c and e of the transistor Q 21 , and the voltage on the connection point P 5  is pulled to “1” by the resistor R 31 . 
       FIG. 4  depicts the circuit  30  of the communication device  2 , comprising a microprocessor U 31 , which is a central control unit for controlling the data input and output, information display and key scanning functions. It further comprises a power circuit  31 , which forms VCC 2  after voltage stabilization through the voltage regulator circuit  34 , to provide power supply for the working of microprocessor U 31 ; the power circuit  31  is connected to the connection point P 5  after passing the resistor R 31 , to provide working power supply for the igniter circuit  20 . The circuit  30  of communication device  2  comprises a display circuit  32 , used to visually display the related information in microprocessor U 31  for operator&#39;s reading. The circuit  30  of communication device  2  further comprises a keying circuit  33 , which may be designed as a key or a combination of many keys, used to allow operators to input data or operational instructions to the microprocessor U 31 . The control data receiving circuit  35  transmits the voltage signal on the communication line to P 7  pin of a microprocessor U 31 , and the microprocessor U 31  can know the received data information by identifying the voltage state on the P 7  pin. The working principle of the control data receiving circuit  35  is exactly the same as the igniter data input circuit  22  in the  FIG. 3 , as illustrated in  FIG. 3 . The control data output circuit  36  is responsible for transmitting the data that are required to be sent by the microprocessor U 31  to the data bus, and then transmitted to MUC control chip U 21  through the igniter data input circuit  22  of the igniter circuit  20 . The working principle of the control data output circuit  36  is exactly the same as the igniter data output circuit  23  in the  FIG. 3 , as illustrated in  FIG. 3 . The connection point P 9  is connected to the connection point P 5  in  FIG. 3 , and the connection point P 10  in  FIG. 3  is connected to connection point P 6 . When the transistor Q 31  in the circuit  30  of the communication device  2  and the transistor Q 21  in the igniter circuit  20  are all turned off, voltage V+ can charge the capacitor C 21  through the resistor R 31 , the connection point P 9 , the connection point P 5  and the diode D 22 , to provide power for the igniter circuit  20 . 
       FIG. 5  is an example of a voltage waveform of the main reference points. Within the period T 1 , the data output terminal port P 4  of the MUC control chip U 21  actively sends data, and the U 31  control data receiving data terminal P 7  port receives the data sent from the data output terminal P 4  of the MUC control chip U 21 , to achieve the data transmission from igniter  1  to the communication device  2 , as shown in  FIG. 1 . Within the period T 2 , the central control circuit data transmitting terminal P 8  of the microprocessor U 31  actively sends data and the data input terminal P 3  of the MUC control chip U 21  receives the data sent from data transmitting terminal P 8  port of the central control circuit, to achieve the data transmission from the communication device  2  to the igniter  1 . 
     The above described are only the preferred embodiments of the present invention, it should be noted that, technicians skilled in the art can make a number of improvements and modifications without departing from the concepts and spirit of the invention, and these improvements and modifications should be considered within the scope of protection of the present invention.