6results about "Ignition safety means" patented technology

To provide a technique which can prevent an electric discharge in an ignition plug at an unexpected timing.SOLUTION: An ignition device 1 for an internal combustion engine using a fuel containing hydrogen has an ignition coil 103 including a primary coil L1 and a secondary coil L2, a power supply device 102, a switching element 70, an ignition plug 113, and a limiting diode 114. The switching element 70 make a switch to carrying or interrupting a primary current flowing to the primary coil L1. The ignition plug 113 discharges electric at a gap d on the basis of a high voltage inducted at one end 822 of the secondary coil L2. The limiting diode 114 is a zener diode or an avalanche diode having a forward direction from the one end 822 of the secondary coil L2 to the other end 821. A breakdown voltage of the limiting diode 114 is larger than a maximum value of a voltage in ON, which is calculated by multiplying a direct current voltage value applied to one end 811 of the primary coil L1 by a ratio of a winding number of the secondary coil L2 to a winding number of the primary coil L1.SELECTED DRAWING: Figure 1

The application provides an over-temperature protection device of an igniter control module, comprising a control unit, a voltage stabilizing filter unit connected to a positive voltage input end of the control unit and configured to provide a power supply voltage for the control unit, a first series voltage dividing unit connected to a same-phase input end of the control unit and configured to provide a reference voltage for the control unit, and a second series voltage dividing unit connected to an inverse-phase input end of the control unit and configured to monitor the temperature of an IGBT power tube and convert the temperature into a monitoring voltage; wherein an output end of the control unit is connected to a gate of the IGBT power tube, and the control unit compares the monitoring voltage with the reference voltage and outputs a control signal for controlling the IGBT. The over-temperature protection device of the igniter control module can effectively control the overall temperature of the igniter control module, and can improve the heating condition of the igniter.

To provide a technique which can prevent an electric discharge in an ignition plug at an abnormal timing.SOLUTION: An ignition device 1 for an internal combustion engine using a fuel containing hydrogen has an ignition coil 103 including a primary coil L1 and a secondary coil L2, a power supply device 102, a switching element 70, an ignition plug 113, a first backflow prevention diode 111, and a first resistance 112. The switching element 70 make a switch to carrying or interrupting a primary current flowing to the primary coil L1. The ignition plug 113 discharges electric on the basis of a high voltage inducted at one end 822 of the secondary coil L2. Between the other end 821 of the secondary coil L2 and the power supply device 102, two first connection lines 122a, 122b are arranged in parallel. The first backflow prevention diode 111 is inserted in the first connection line 122a, and has a forward direction from the one end 822 of the secondary coil L2 to the other end 821. The first resistance 112 is inserted in the first connection line 122b, and has a resistance value of 1 MΩ or more.SELECTED DRAWING: Figure 1

A method (100) for limiting the rotational speed of a crankshaft (3) of an internal combustion engine (10) of a handheld power tool (1). The internal combustion engine (10) includes an ignition device (7), an intake system (9), a throttle valve (11) in the intake system (9), and an electric actuator arrangement (13) configured to move the throttle valve (11) between an open position and a closed position. The method (100) includes a step (110) of retarding the ignition timing of the ignition device (7) from an initial ignition timing to a retarded ignition timing when the rotational speed of the crankshaft (3) exceeds an upper speed limit, and a step (120) of controlling the electric actuator arrangement (13) to move the throttle valve (11) toward the closed position. The present disclosure further relates to a control arrangement (21) and a handheld power tool (1).

The application provides an engine reverse rotation judgment and suppression method, system, electronic equipment and storage medium. The engine reverse rotation judgment and suppression method first numbers each tooth in a square wave signal of a crankshaft. Then, a current rotating speed of the engine is acquired, and at least one instantaneous speed drop rate of each cylinder is acquired when the current rotating speed is less than a preset reverse rotation speed threshold. A reverse rotation judgment result of the current engine is given according to the instantaneous speed drop rate of each cylinder and a preset judgment threshold. If the reverse rotation judgment result is reverse rotation judgment success, the magnetization state of an ignition coil of the cylinder is adjusted. The engine reverse rotation judgment and suppression method can effectively suppress the impact force caused by ignition during reverse rotation and protect the engine structure.

This ignition device is provided with: an ignition coil (2) having a primary coil (21) connected to a power supply (B) and a secondary coil (22) that generates a high voltage as the primary coil (21) is energized; an ignition plug (3) having a center electrode (31) connected to the secondary coil (22) and a ground electrode (32) facing the center electrode (31) with a discharge gap (4) therebetween; and a parallel circuit (5) having a diode (51) that regulates the direction of current flow between the secondary coil (22) and the center electrode (31) and a resistor (52) electrically connected in parallel to the diode (51), wherein a resistance value R (unit: MΩ) of the resistor (52) and a gap value G (unit: mm) of the discharge gap (4) satisfy the relationship of formula 1.　Formula 1: 13.69 × 10X ≤ R ≤ 16.17 × 10Y, where X = −2.75 × G and Y = 1.72 × G.