Abstract:
The invention provides an ignition control device and a killing control device correspond. An ignition control device comprises an ignition circuit module and a killing control device corresponds. The ignition circuit module comprises a killing control device including a killing switch and a timing retard circuit module connected to the ignition circuit module. When the killing control operates, the ignition circuit stops igniting. The invention has following advantages: reasonable structure, low cost, stable control circuit and safe operation and so on.

Description:
TECHNIC FIELD 
       [0001]    The invention relates to an ignition control device, specially to an ignition control device with a killing control device correspond. 
       BACKGROUND 
       [0002]    A micro engine such as a gas engine which working process is shown as in  FIG. 1  is usually used to a micro machine such as a trimmer and so on. The existing micro engine is usually rotated by the outside force. The coil produces a voltage driving the ignition circuit module of the ignition control device by induction after the coil cutting the magnetic lines of force. The engine ignites and works after the ignition circuit module outputs high voltage. When the machine need be closed, the power of the ignition circuit module is shorten after actuating the killing switch, then the engine stops igniting so that the rotate speed changes from high to low until fully stop. 
         [0003]    In prior art, the ignition control device may be set on the normal ready state once cutting the killing switch, since the power of the ignition circuit module is shorten and grounded directly after turning on the killing switch. Then when working, there exits more serious danger because the engine may be in low rotate speed when the ignition control device recovers the normal work state so that the ignition control device start again. The killing coil is also used to send the signal to the killing circuit in prior art, but it has some disadvantages such as complicated manufacture, unstable quality, inferior security and high cost and so on. 
       SUMMARY OF THE INVENTION 
       [0004]    The object of the invention is providing an ignition control device and a killing control device correspond with reasonable structure, low cost, reliable control circuit and safe operation. 
         [0005]    To achieve said object, the invention provides the following technique design. 
         [0006]    An ignition control device comprises an ignition circuit module and a killing control device corresponds. The ignition circuit module comprises a killing control device including a killing switch and a timing retard circuit module connected to the ignition circuit module. When the killing control operates, the ignition circuit stops igniting. The engine rotates by the outside force and drives the ignition circuit module of the ignition control device through the induction of the coil. Then the engine is ignited and starts to working after the ignition circuit module outputting the high voltage. After actuating the killing switch of the killing control device, the ignition circuit module stops outputting the ignition voltage immediately and the engine stops igniting when the killing control device operates. 
         [0007]    The timing retard circuit module of the killing control device comprises at least one level charge circuit module. The level of the charge circuit may be set to two levels or more corresponding to the rotate speed of the engine. By selecting the different levels, the time of the ignition circuit without ignition voltage may be controlled so as to the engine is in fully stopping state. The killing switch of the killing control device is arranged on the location suitable for operation. The timing retard circuit module of the killing control device further comprises a voltage division module providing the turn-on voltage of the transistor Q 3  to decrease the input impedance and improve the anti-interfere ability. The killing control device further comprises a diode to protect the transistor Q 3  when working. 
         [0008]    The parameters of the capacitors and the resistances of the timing retard circuit module may be regulated to meet the need for timing retarding. The capacitance range of the capacitor C 2  of the killing control device is 0.68 uF˜22 uF. The capacitance range of the capacitor C 3  is 10 uF˜50 uF. The resistance range of the resistor R 8  is 30 KΩ-300 KΩ). The resistance range of the resistor R 9  is 90 KΩ-300 KΩ. 
         [0009]    The invention has following advantages comparing with the prior art: 1. simply manufacture, low cost and stable quality; 2. the engine may be in fully stopping state to ensure the safety of the engine operation; 3. the ignition circuit of the ignition control device may autorecover and the engine is autorecovered to ready-to-start state. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0010]      FIG. 1  is a working flow diagram of the prior art; 
           [0011]      FIG. 2  is a working flow diagram of the present invention; 
           [0012]      FIG. 3  is a schematic view of the present invention; 
           [0013]      FIG. 4  is a circuit schematic view of an embodiment of the present invention; 
           [0014]      FIG. 5  is a circuit schematic view of another embodiment of the present invention; 
           [0015]      FIG. 6  is a schematic view of an application of the present invention; 
           [0016]      FIG. 7  is a schematic view of another application of the present invention. 
       
    
    
     DETAILED DESCRIPTION 
       [0017]    The embodiments of the invention will be detailedly explained referred to the drawings. 
         [0018]    Referring to the drawings, the invention starts to work corresponding to the followings: when the operator need to start the engine  2 , the engine  2  rotates to cause magnetic lines of force cutting the coil by outside force, then the ignition circuit module  4  of the ignition control device  1  starts to work by the induction of the coil L 2  and sends the high voltage to the engine  2  through the high voltage line  7  so that the engine  2  may be ignited and start to work normally; when the operator need to stop the engine, then killing switch K 1  is actuated, the killing control device  3  starts to work while the ignition circuit module  4  stops outputting the ignition voltage immediately and then engine  2  isn&#39;t ignited; after the killing switch is unactuated, there exists at least one level charge circuit  5  between killing switch K 1  and ground, so the ignition circuit  4  is still in no ignition voltage output state until the voltage discharge of the capacitor in the charge circuit  5  ends. At the same time, the engine  2  has fully stopped and closed safely. 
         [0019]    As shown in  FIG. 2 , the killing switch K 1  may arranged on any location suitable for operating such as the handle of the trimmer in the present invention. 
         [0020]    As shown in  FIG. 3 , the engine  2  comprises an ignition control device  1  including an ignition circuit module  4 . The invention further comprises a killing device  3  connected to the ignition device  1 , wherein the timing retard circuit module  5  is connected to the ignition circuit module  4 . 
         [0021]    The circuit shown in  FIG. 4  comprises an ignition circuit module  4  and a timing retard circuit module  5 . Said ignition circuit module comprises an induction module and a transformer output module. Said induction module comprises a charge coil L 1  and a trigger coil L 2 . When the engine  2  is rotating and the coil is cutting the magnetic lines of force, said induction module sets the ignition circuit module into work state through electromagnetic induction. Said transformer output module comprises a primary coil L 3  and the ignition circuit outputs high voltage through the coil L 4 . 
         [0022]    The ignition circuit module  4  shown in  FIG. 4  further comprises a diode D 1 , a diode D 2 , a diode D 3 , a diode D 4 , a resistor R 1 , a resistor R 2 , a resistor R 3 , a resistor R 4 , a SCR Q 1 , a capacitor C 1  and a transformer. A node A is set among the diode D 1 , the capacitor C 1  and the SCR Q 1 . The anode of the SCR Q 1  is connected to the node A and the cathode is grounded. The gate of the SCR Q 1  is connected to one side of the resistor R 4 , the other side of the resistor R 4  is connected to the cathode of the diode D 3 . One end of the resistor R 3  is connected between the resistor R 4  and the diode D 3  and the other end is grounded. One end of the resistor R 2  is connected to the anode of the diode D 3  and the other end is grounded. The anode of the diode D 3  is connected to one side of the trigger coil L 2  and the other side of the trigger coil L 2  is grounded. At the same time, the node A is connected to one side of the capacitor C 1 . The other side of the capacitor C 1  is grounded through the primary coil L 3  of the transformer. The anode of the diode D 1  is connected to one side of the charge coil L 1  and the other side of the charge coil L 1  is grounded. Where the anode of the diode D 1  is connected to the charge coil L 1  is a node B. One end of the resistor R 1  is connected to the node B and the other end is grounded. The cathode of the diode D 4  is connected to the node A and the anode is grounded. 
         [0023]    The timing retard circuit module  5  shown in  FIG. 4  further comprises a killing switch K 1 , the diodes D 2  and D 6 , SCR Q 2 , an transistor Q 3 , the capacitors C 2  and C 3 , the resistors R 5 , R 6 , R 7 , R 8  and R 9 . The anode of the diode D 2  is connected to the backend of the charge coil L 1 . The cathode of the diode D 2  is connected to the anode of the SCR Q 2 , the emitter of the transistor Q 3 , one end of the resistor R 5  and one end of the resistor R 6 , respectively. The other end of the resistor R 6  and one end of the resistor R 7  are connected to the base of the transistor Q 3 . The other end of the resistor R 5  is connected to the other end of the resistor R 7 . One end of the killing switch K 1  is connected to the point where the resistor R 5  connected to the resistor R 7  and the other end is grounded. One end of the resistor R 8  is connected to the gate of SCR Q 2  and the other end is connected to one end of the resistor R 9 . The other end of the resistor R 9  is connected to the cathode of the diode D 6 . The anode of the diode D 6  is connected to the collector of the transistor Q 3 . One end of the capacitor C 2  is connected between the resistor R 8  and R 9  and the other end is grounded. One end of the capacitor C 3  is connected between the resistor R 9  and the diode D 6  and the other end is grounded. 
         [0024]    The timing retard circuit module  5  comprises a charge circuit module  33  including the capacitors C 2  and C 3  as well as the resistor R 8  and R 9  to achieve the timing retard. The timing retard circuit module  5  further comprises a voltage division module  32  providing the turn-on voltage of the transistor Q 3  to decrease the input impedance and improve the anti-interfere ability. The killing control device  3  further comprises a diode to protect the transistor Q 3  when working. The killing control device  3  further comprises a switch. 
         [0025]    The level of the charge circuit of the charge circuit module  33  shown in  FIG. 4  may be set to one level, two levels or more corresponding to the rotate speed of the engine. The time for the ignition circuit without the ignition voltage output may be controlled so that the engine is fully stopped through selecting the different levels. 
         [0026]    The parameters of the capacitors and the resistors of the charge circuit module  33  shown in  FIG. 4  may be regulated to suit to the timing retard. The capacitance range of the capacitor C 2  of the ignition control device is 0.68 uF˜22 uF. The capacitance range of the capacitor C 3  is 10 uF˜50 uF. The resistance range of the resistor R 8  is 30 KΩ-300 KΩ. The resistance range of the resistor R 9  is 90 KΩ-300 KΩ. 
         [0027]    The parameters of the capacitors and the resistors of the charge circuit module  33  shown in  FIG. 4  may be regulated to suit to the timing retard. For example, when C 2 =1 uF, C 3 =22 uF, R 8 =91 KΩ, R 9 =91 Kω, the timing retard is 3.5 S when the rotate speed of the engine 3000 r/min, the timing retard is 5 S when the rotate speed of the engine 8000 r/min. 
         [0028]      FIG. 5  is a circuit schematic view of another embodiment of the present invention which working principle is same as in  FIG. 4 . The components in  FIG. 5  are essentially same as the  FIG. 4  so that the type and the parameters of the components may refer to that in  FIG. 5 . The difference between  FIG. 5  and  FIG. 4  is that the switch isn&#39;t shown in  FIG. 5 . 
         [0029]    The level of the charge circuit of the charge circuit module  33  shown in  FIG. 5  may be set to one level, two levels or more corresponding to the rotate speed of the engine. The time for the ignition circuit without the ignition voltage output may be controlled so that the engine is fully stopped through selecting the different levels. 
         [0030]    In the module  35  shown in  FIG. 5 , one end of the killing piece is connected to a switch. The other end of the switch is grounded. 
         [0031]      FIG. 6  is a schematic view of an application of the present invention comprising a high voltage line  7 , a control circuit board  6 , a killing control device  3 , a charge coil L 1 , a trigger coil L 2  and a primary coil L 3 . The control circuit board  6  is installed on the face of said ignition device. The part of the ignition control, the trigger coil L 2  and the charge coil L 1  compose a ignition circuit  4 . The killing control device  3  comprises a timing retard circuit  5 . 
         [0032]      FIG. 7  is a schematic view of another application of the present invention, wherein the ignition control device  1  and the control circuit board also may be set at the right of said ignition device. 
         [0033]    As the embodiments of the present invention have been described above, it should be understood that the present invention is not limited to the above specific embodiments. Various modifications or alterations can be made by those skilled in the art without departing from the scope as defined by the appended claims.