Showing papers on "Spark (mathematics) published in 1980"

Spark timing control system for internal combustion engine

Abstract: The occurrence times of discharges of a multi-cylinder internal combustion engine of an automotive vehicle having a transmission and sources for deriving signals indicative of: (a) the engine being cranked or operating normally, (b) the transmission being in high or low gear, (c) engine speed, and (d) the values of parameters determining engine load are controlled by a computer responsive to the signals. The computer includes a read only memory having tables for storing signals with values indicative of spark advance and dwell angle as functions of engine load and engine speed for the engine being cranked, operating normally, the transmission being in high and low gear. The computer responds to the signals of the sources for selecting from the tables stored signals having values indicative of spark advance and dwell angle corresponding with the conditions indicated by signals (a), (b), (c) and (d). A spark control circuit responds to the signals having values indicative of spark advance and dwell angle to control the occurrence times of sparking for each cylinder of the engine. The same type of computer is susceptible to use for vehicles having different spark advance and dwell angle characteristics as functions of engine speed and engine load. The tables are for plural vehicle types having the different characteristics. Switches selectively enable signals of the tables associated with only one of the vehicle types to be coupled to the computer.

Spark intensifier in gasoline engine

Abstract: A high-tension secondary current generated from an ignition coil is accumulated in a capacitor set at the head of a spark plug in a gasoline engine for automobiles, etc., and when the voltage of the discharging shaft at the end of the spark plug has built up to a predetermined value for discharge, the static electricity accumulated in the capacitor is discharged at a stroke to let out strong sparks.

Ripple insensitive electric precipitator

Abstract: A control system for automatically maintaining a maximum output voltage across the electrodes of a precipitator under varying load conditions without requiring manual readjustment of sensitivity controls. A spark threshold detector provides a threshold crossing signal when a spark occurs across the electrodes of the precipitator. Control circuitry including a ramp generator is responsive to the threshold crossing signal for providing a ramp signal which is effective to vary the voltage applied to the precipitator as a function of the desired spark rate. A sensitivity adjust circuit produces a compensating signal proportional to the magnitude of the ripple on the voltage applied to the precipitator. The DC level of the spark threshold detector is adjusted in accordance with the compensation signal so that the detector is insensitive to variations in the ripple whereby the predetermined spark rate is automatically maintained.

Method and apparatus for ignition system spark timing control within warm-up period of the engine

Abstract: A method and apparatus for controlling ignition system spark timing. Engine temperature is sensed and a basic value of spark advance is determined by calculation based upon the engine operating parameters excluding the engine temperature. This basic value of spark advance is corrected by a central processor in accordance with the sensed engine temperature.

Method of stabilizing operation of a hybrid spark chamber

Abstract: A method of stabilizing operation of a hybrid spark chamber is disclosed. The method is applied to a self-triggering hybrid spark chamber of the gas-flow type including a spark chamber portion and a proportional chamber portion, and utilizes a high speed discharge circuit for the proportional chamber portion, the high speed discharge circuit being so constructed that upon generation of a precedent spark in the spark chamber portion by electrons produced by radiation and multipled in the proportional chamber portion the discharge circuit is simultaneously operated in response to the spark so as to rapidly lower an electric field intensity of the proportional chamber portion, thereby preventing the generation in the proportional chamber of any induced spark.

Noocontact ignition device for engine

Abstract: PURPOSE:To obtain an enough spark advancing property for an engine and enable sure ignition, by providing a plurality of triangular wave voltage generators for controlling the width of spark advancement and by setting the voltage gradient angles of the generators depending on the change in the condition of the engine CONSTITUTION:A projection 2 is provided at an angle for a spark advancement width A-B on the peripheral surface of a rotor 1, which is driven by an engine A plus signal is produced in a reference ignition position A by a pulser 3 A minus signal is produced in a maximum spark advancement position B by the pulser A flip-flop 4 is operated by the output of the pulser 3 to proeuce a first triangular wave voltage by a first triangular wave generation circuit 5 and operate a third triangular wave generation circuit 6 The charging time constant of a third triangular wave voltage is changed by a spark advancement width switching sensor 10, which acts depending on the condition of the engine 11 The outputs of the triangular wave generation circuits 5, 6 are compared with each other by a comparison circuit 7 to operate another triangular wave generation circuit 8 to perform spark advancement The outputs of the triangular wave generation circuits 8, 5 are compared with each other by another comparison circuit 9 to obtain a spark advancement signal An ignition circuit is operated by a trigger voltage output circuit 12

Engine spark timing control with added retard and RF signal protection

Abstract: A spark ignited internal combustion engine includes a spark coil in which current is turned on and off to generate spark events. A triangular wave voltage generator and comparator combine to retard the spark events from spark timing signals, the voltage ramping in one direction toward a reference in response to a spark timing signal and ramping in the other direction when the comparator senses that the voltage equals the reference, at which time a spark event is initiated. An RF clamp clamps the input to the comparator to prevent initiation of a spark event from each spark event to the following spark timing event. A minimum burn timer may be initiated by the comparator to prevent current flow in the spark coil for a minimum predetermined time after the initiation of a spark event; and the RF clamp may include a timer to delay its initiation sufficiently to allow latching of the minimum burn timer.

High power protective device - has spark gap and small protective resistor in series and disconnector opened by UV sensor detecting spark

Abstract: The protective device has a spark gap and a protective resistor in series Current flows from a current source over the spark gap A disconnector interrupts the flow of current through the protective resistor when a spark appears across the spark gap A radiation sensitive device(7) responds to the radiation emitted by the spark as it crosses the gap and controls the disconnector The radiation sensitive device contains a uv sensor The advantage lies in being able to use a lower power protective resistor It is applicable to a high power transmitter

High voltage spark carbon fiber detection system

Abstract: The pulse discharge technique was used to determine the length and density of carbon fibers released from fiber composite materials during a fire or aircraft accident. Specifications are given for the system which uses the ability of a carbon fiber to initiate spark discharge across a high voltage biased grid to achieve accurate counting and sizing of fibers. The design of the system was optimized, and prototype hardware proved satisfactory in laboratory and field tests.

Thermo-reactor with separate ignition for IC engine exhaust gases - has spark paths coupled in series and with parallel capacitor

Abstract: The separately ignited after-burner for exhaust gases has the spark path arranged in the ignition field of the after-burner. The first spark path after the ignition voltage source is positioned within the combustion chamber of the internal combustion engine, with all the spark paths coupled in series and with a parallel capacitor connected across them. An additional parallel capacitor is pref. connected across at least one of the spark paths coupled in series.

Spark machining method

Abstract: PURPOSE:To do spark machining without lowering dimensional accuracy even with any electrode wear, by giving the electrode a rotational motion while moving straight in parallel. CONSTITUTION:A work 10 and an electrode are both immersed in the insulation oil and a voltage from a power source is applied between them. The electrode 11 is given a turn around its center axis while moving by a length l during its parallel transfer along the work's side 10a. Even if the circumference of the electrode 11 is partly worn due to the spark, the unworn portion sequentially faces the work to carry out the spark erosion constantly.