Abstract: A dilute air-fuel mixture operation as a method for purifying exhaust gas is effective for reducing simultaneously carbon monoxide (CO), hydrocarbons (HC), and nitrogen oxides (NOx) contained in the engine exhaust. However, such operation reduces engine power remarkably. Though a reciprocating internal combustion engine having first and second spark plugs has been introduced to compensate this disadvantage, it has in turn brought about the problem that there is a tendency of increasing quantities of nitrogen oxides. While an increase of the interval between the firing of the two plugs may control an increase of nitrogen oxides, this results in a reduction of engine power. A most effective method of exhaust purification is to control an ignition system such that the interval between the firing of two plugs is made short only when high engine power is required, and the firing interval is made comparatively long in the normal operation of the engine.

Abstract: To reliably permit closing of a switch controlling operation of a fuel supply pump which provides pressurized fuel to a fuel injection system, even under low air flow conditions in the induction pipe of an internal combustion engine, an auxiliary spring is arranged to counteract the force of a reset spring against which a deflection flap or disk in the induction pipe of the engine is deflectable. The auxiliary spring is active only over a limited range of deflection, from rest position, and immediately adjacent thereto, so that the fuel pump will not be dis-connected under low air flow conditions.

Abstract: A temperature controlled ignition circuit includes a high voltage coil, ignition circuitry connected thereto and a magnetic generator for controlling the operation of the ignition circuitry and the production of a high voltage at the coil. A transistor in the ignition circuitry is connected at its base to one terminal of the magnetic generator and is biased for full conduction upon provision of some predetermined positive voltage by said generator. A second transistor having operating characteristics similar to those of the first is connected to operate as a diode; i.e. with the base electrode being connected to the collector electrode thereof.

Abstract: Electronic-control carburetor adapted to emulsify a metered amount of fuel in synchronism with the induction phases of the cylinders of an internal combustion engine, which comprises a double sonic venturi system providing a low loss of pressure and supplied under the control of an electromagnetic valve in synchronism with the induction phases of the cylinders.

Abstract: This invention relates to a conveyor for transporting sheets of material through an ultraviolet exposing chamber for curing and setting of a coat. Up to this time, the drying of solvent ink has involved considerable pollution problems, a fair consumption of natural gas and large and costly ovens with high temperature incineration systems. These problems have generally been brought about by long ovens wherein the metal sheet has been passed through once or twice in order to accomplish curing or drying.