Abstract:
In the ignition device for the battery-less engine, a transistor-type ignition control circuit of the engine including a manual starting device is actuated by using output of the generator driven by the engine, and a primary winding of an ignition coil is powered from the ignition control circuit. In the ignition control circuit, a primary powering time period for powering the primary winding from the ignition control circuit is set shorter than a predetermined time period while an engine speed of the engine is within a low engine speed range below a predetermined engine speed, whereas the primary powering time period is set equal to or longer than the predetermined time period while the engine speed of the engine is within a high engine speed range at and above the predetermined engine speed.
Abstract:
Provided is a control device for an internal combustion engine, employing a microprocessor to control a load other than an ignition device, the control device being provided to an internal combustion engine in which is installed a magnet generator that has a magneto coil for successively generating, in association with revolution of the internal combustion engine, a first half wave voltage, a second half wave voltage of different polarity than the first half wave voltage, and a third half wave voltage of identical polarity to the first half wave voltage; and the magnet generator employing the second half wave voltage to drive the ignition device. The device is provided with an electricity storage element which draws excess power from the output that is output by the magnet generator for the purpose of driving the ignition device, and which is charged by the first and second half wave voltages, as well as being charged by the second half wave voltage as well at times that the internal combustion engine is in the exhaust stroke, in order to supply power to the load and to the microprocessor. The power source circuit is constituted to use the energy stored in this electricity storage element to generate power source voltage for presentation to the microprocessor and to the load other than an ignition device.
Abstract:
An ignition coil for an internal combustion engine is equipped with an assembly of a connector casing and a coil body. The coil body includes a primary winding wound around a primary spool. The connector casing has terminals each of which is equipped with a conductor fastener. The conductor fastener has a slit in which one of ends of the primary winding is fit to make an electric connection between the terminal and the primary winding. The primary spool has conductor guides and a backup support to establish alignment of each of the ends of the primary winding with one of the conductor fasteners and also to facilitate insertion of each of the ends of the primary winding into one of the conductor fasteners when the coil body is fitted into the connector casing, thereby ensuring the stability of electric connection between the primary winding and the terminal.
Abstract:
The invention relates to an ignition device for an Otto engine, comprising an ignition coil, a printed circuit board, which carries a control circuit with a power transistor, a plastic housing, in which the ignition coil and the printed circuit board are arranged, and a thermal dissipation element, which protrudes through a wall of the plastic housing. In accordance with this disclosure, the printed circuit board carries a cooling body, which is plugged together with the thermal dissipation element to form a thermal bridge, which dissipates thermal losses of the control circuit out from the plastic housing.
Abstract:
A dual coil half bridge converter adapted to be coupled to a dual coil actuator of a cylinder valve in an internal combustion engine is described. In one example, the converter has a first and second capacitor and a voltage source, where the converter is actuated via switches to individually energizing coils in said dual coil actuator. A voltage regulator is also shown for maintaining midpoint voltage during unequal loading of different actuator coils in the converter.
Abstract:
An injector drive circuit capable of driving an injector of an internal combustion engine without using a DC-DC converter expensive. The injector drive circuit includes a power circuit for converting a voltage outputted from a magneto mounted on the engine into a DC voltage, a capacitor charged with a voltage accumulated in a voltage accumulator, a drive current feed circuit for applying a voltage across the capacitor to a solenoid coil to feed a drive current to the solenoid coil when it is fed with an injection command signal, and a holding current feed power supply section for feeding the solenoid coil with a holding current required for keeping a valve open after the drive current fed from the capacitor to the solenoid coil passes a peak value.
Abstract:
The present invention involves a carbureted fuel system for an internal combustion engine for small utility implements. The engine includes a crankcase with a cylinder bore. The crankcase rotatably supports a crankshaft having a flywheel and a magnet disposed on an outer periphery of the flywheel. The crankshaft is also connected to a reciprocating piston disposed in the cylinder bore. A cylinder head is attached to the crankcase over the cylinder bore, and a carburetor is disposed on the cylinder head. The carburetor is in communication with a fuel supply and an air inlet. The carburetor includes a mixing chamber in which the fuel and air are mixed together and then introduced into the manifold and eventually into the cylinder via a valve for combustion therein. In communication with the main passage of the carburetor is a secondary air inlet in which is disposed an air bleed device, such as a solenoid or PZT operated actuator, which is controlled by an electronic control unit. An induction coil is disposed adjacent the flywheel and is coupled to the electronic control unit so that the rotation of the flywheel generates a pulse on the induction coil that is processed by the electronic control unit. Based upon the information derived from the electrical pulses generated by the induction coil, the electronic control unit activates the air bleed device to enrich or enlean the air-to-fuel mixture fed into the cylinder for combustion. In this manner emissions associated with the operation of the engine may be reduced.
Abstract:
A capacitor discharge type ignition system for an internal combustion engine has a secondary charge coil mounted on a ferromagnetic core adjacent to a primary charge coil and an ignition coil, and means for selectively providing current from a battery to the secondary charge coil to increase the charging of a capacitor with the fly back voltage of the secondary charge coil when the current supplied to it from the battery is interrupted or terminated to increase the charge stored by the capacitor at low engine speeds and thereby facilitate starting an engine at very low engine speeds. The battery provides additional energy necessary to provide ignition and starting of the engine at very low engine speeds and can also be used to provide power for other functions, such as to electric starting of the engine, or to power other auxiliary features of the machine powered by the engine. Advantageously, the secondary charge coil is not regulated and excess power discharged from the secondary charge coil is directed to the battery to recharge the battery and maximize its life.
Abstract:
The blower/ignition/electrical system supplies the air, spark, and electrical power to facilitate and control the fuel combustion in a heat exchanger for devices which output a fluid, such as a pressure washer. The system is belt driven as an intricate part of the mechanical power system used for the fluid pressure pump. The flange/magnet hub spins past the ignition coil which in turn produces a high voltage electrical source. This potential is applied across the electrode gap to ignite a fuel. The flange magnet hub also spins past a stator coil assembly which in turn produces an alternating current. This current can be rectified or left unrectified, and is wired to a switch. When the switch is activated, the current path is through the safety control devices (such as temperature control, pressure switch or flow switch) and the fuel solenoid valve which controls the fuel flow into the combustion chamber. With the air, ignition spark, and fuel supplied and controlled in the combustion chamber, fuel combustion can now occur.
Abstract:
A discharge ignition apparatus for use with a small internal combustion engine has built-in overspeed disable capability. At operating speeds below an overspeed threshold, revolution of a magnet assembly past a stator unit having a magnetically permeable core causes accumulation of charge across a storage capacitor. When the capacitor has reached a fully charged state, a triggering signal is applied to the gate of a SCR device to cause rapid discharge through the primary coil of a step-up transformer. The higher voltage produced at the secondary coil of the step-up transformer is then applied across the gap of a spark plug. At operating speeds exceeding the overspeed threshold, a second trigger circuit renders the SCR conductive prior to substantial accumulation of charge across the storage capacitor. The second trigger circuit includes a zener diode or other voltage threshold element in circuit with a trigger coil operative to produce a speed dependent voltage signal. A high-pass filter, such as a passive RC filter, may be connected interposing the trigger coil and the zener diode to condition the waveform and inhibit accelerated trigger of the SCR at speeds below the overspeed threshold.