Abstract: Method of preparing powder metal steel parts having improved machinability.

Abstract: NOx formation in a fixed geometry burner is minimized during steady state operation of a gas turbine engine by burning homogenous gaseous fuel and air mixtures in successive combustion stages of controlled duration and temperature determined by fuel to air ratios proximate the lean limit for combustion. When combustion is substantially complete in each stage NOx, formation is further inhibited by quenching the combustion temperature with comparatively cool air or the lean mixture for the next successive stage.Nox formation is effectively minimized during acceleration by supplying fuel to the combustion stages in sufficiently rich mixtures to consume all the available oxygen and to effect comparatively cool combustion temperatures.

Abstract: A fuel supply line for an automobile engine extends from a fuel tank to a carburetor and contains an engine driven fuel pump and a poppet type flow check or roll-over valve downstream of the pump, which valve is normally held open by comparatively low pump pressure. If the engine stalls, as for example in the event of a collision or automobile roll-over, the pump will stop operating and the valve will be positively closed by a spring to prevent fuel leaking from the tank. The valve will not re-open until subjected to comparatively high pump pressure upon restarting of the engine.

Abstract: An electronic engine control system for an internal combustion engine has at least a portion of its circuitry mounted on circuit boards which are disposed generally in the path of induction air drawn into the engine via the engine air filter housing. The circuit boards are mounted within a molded plastic circuit board mounting housing which is disposed over openings in the sidewall of the sheet metal air filter housing and which is removably mounted thereon by means of attaching screws. An inlet snorkel via which induction air is drawn into the air filter housing is a molded plastic element secured to the circuit board mounting housing with the circuit board mounting housing being disposed between the snorkel and the air filter housing.

Abstract: A single unit is provided which serves the dual functions of windshield washer reservoir and storage battery heat shield. The unit is a thin walled box-like structure sized to overlie a battery. A portion or all of the sides of the unit are formed to provide a cavity for holding windshield washer fluid. This cavity, with or without the presence of fluid, provides extremely effective thermal insulation for the prevention of battery overheating.

Abstract: A fluid level sensor comprising a novel electronic circuit which monitors change in the fluid level in a reservoir through a conductive probe disposed therein. The probe and a capacitor are electrically connected in a circuit which is intermittently energized to create an electrical transient therein. The transient is monitored, and a warning is given when the transient indicates that the probe is not in contact with the fluid in the reservoir. Two embodiments are disclosed as applied to a vehicle hydraulic brake system having a dual reservoir type master brake cylinder with a probe for each reservoir. In one, only a single capacitor is required since the electronic circuit electrically connects each probe with the capacitor sequentially by means of time multiplexing. In the other, a capacitor is required for each probe and the transients in each capacitor/probe circuit are fed to a logic circuit which determines if any of the probes is out of contact with the fluid in the reservoir.

Abstract: 1. A low radar cross-section re-entry vehicle comprising: a tubular metallic cannister enclosing all instrumentation and payload for said vehicle, said cannister having a diameter of approximately 10 inches and an overall length of approximately 65 inches with a conical portion having an included angle of approximately 26.degree. closing the forward end thereof and a closure at the rear end of said cannister; and an aerodynamic fiberglass superstructure conical in form completely enclosing said cannister with the forward end of said cannister nested in the forward end of said superstructure, said superstructure having an included angle of approximately 26.degree., a length of approximately 67 inches and a base diameter of approximately 30 inches; said vehicle having its center of gravity closer to the pointed forward end thereof than is the center of pressure thereof.

Abstract: An electronic engine spark timing controller contains a throttle position transducer circuit and an intake manifold vacuum transducer circuit which provide respective signals representing the throttle position and the magnitude of intake manifold vacuum. Each of these two circuits contains a novel configuration of electronic circuit elements to develop an output electrical waveform composed of repetitive pulses each of which has a pulse width representative of the corresponding mechanical input signal which is supplied to the circuit via a transducer in the form of a coil whose inductance is varied in accordance with the mechanical input signal. The coil in each transducer circuit forms a portion of an RL type monostable circuit which exhibits an electrical transient when triggered. Both transducer circuits are triggered from a free-running pulse generator which is set to generate pulses at a fixed frequency.

Abstract: A housing containing a pair of electronic circuit boards removably mounts on the side of an engine air filter housing. The circuit board housing has a generally concave inner face matching the convex contour of the air filter housing side wall and is disposed over air circulation openings in the air filter housing side wall. In a first embodiment, the circuit board housing is of one-piece construction and the electronic circuit boards are disposed interiorly of the outer wall of the circuit board housing and in generally parallel relationship therewith. In a second embodiment, the circuit board housing is of two-piece construction having upper and lower halves. In this embodiment, the circuit boards are horizontally disposed, one each in each of the two housing halves. Connectors for effecting connection of the circuit boards with the other components of the system which are located exteriorly of the air cleaner housing extend through holes in the circuit board housing.

Abstract: A vacuum control system sourced by engine manifold vacuum particularly for exhaust gas recirculation (EGR) systems and carburetor idle enrichment systems wherein a timer means delays system operation for a predetermined period following engine start-up.

Abstract: A vortex swirl flowmeter sensor circuit electrically connected to an electro-thermal sensor generates a voltage signal output from a flowmeter probe with the signal having a large signal to noise ratio. The sensor is electrically connected in a bridge network in the input to an operational amplifier. The output of the amplifier is fed back through a signal enhancement circuit for maintaining the instantaneous temperature of the sensor, and therefore its resistance constant.

Abstract: A fluid flow sensor fabricated by integrated circuit techniques is positioned within fluid flow passages for measuring the mass flow of fluid therethrough. The sensor comprises three solid state circuit devices wherein two are fabricated on a chip separate from the third device.The first device is responsive to forced convective heat transfer by the fluid flowing thereover for generating a first electrical signal. The third device is responsive to temperature of the fluid thereover for generating a second signal and the second device is responsive to both said first and second electrical signals for maintaining said first device at a predetermined temperature above said third device.A fuel metering system for internal combustion engines is described utilizing a fluid flow sensor for measuring the mass flow of both fuel and air into the throttle body. Circuit means responsive to said sensors operate to maintain a predetermined fuel-air ratio in said internal combustion means.

Abstract: A pickup operatively coupled with an internal combustion engine develops a train of bi-polar pulses wherein each bi-polar pulse is generated at a predetermined engine crank angle and each bi-polar pulse comprises a leading pulse portion of one polarity and a trailing pulse portion of opposite polarity. A bi-stable circuit is switched to a set condition in response to a given magnitude of the trailing pulse portion of each bi-polar pulse and is switched to a reset condition in response to a given magnitude of the leading pulse portion of each bi-polar pulse. A monostable circuit is operatively coupled with the bi-stable circuit to provide an output pulse of predetermined duration in response to the switching of the bi-stable circuit from the reset to the set condition. A transistor has its emitter-collector circuit connected across the capacitor of the engine spark timing controller integrator circuit and its base terminal connected to the output of the monostable circuit.

Abstract: A clamping device adapted to be quickly and easily applied and released for securing objects together. This clamping device is especially useful in connection with removable vehicle seats such as found in van type vehicles where it is desirable that the seats be easily installed or removed. The clamping device comprises a stud member capable of being easily attached to one of the objects such as the vehicle floor and a compression lever which is engageable with the free end of the stud so as to pivot into contact with the other object as, for example, a vehicle seat leg, thereby clamping the objects together.

Abstract: Diffusion-alloying of aluminum into copper brazed joints and structures, particularly for turbine engine regenerator cores.

Abstract: The method comprises introducing a mixture of uncured epoxy resin and curing agent in a coolant passage adjacent an exhaust passage and curing the resin into a solid insulating layer against the walls of the coolant passage.

Abstract: Chromium plated corrosion oxidation resistant spark plug electrode.

Abstract: 32.

Abstract: A catalytic reactor is made by providing a generally cylindrical catalytic substrate of oval transverse section and clamping the same between paired housing shells to form a housing of oval section spaced from the substrate by means of a pair of wire mesh ropes seated within a corresponding pair of grooves extending around the periphery of the substrate at axially spaced locations. Each rope is compacted from a matrix of multiple layers of resilient stainless steel knitted wire and is interlocked with the housing by means of a pair of inwardly opening channels of the housing spaced axially by an inwardly projecting rib of the housing. The grooves in the substrate are pressed radially into the latter while the same is in a plastic uncured condition, thereby to compact and reinforce the grooves to withstand the localized compressional force of the ropes seated therein after the substrate is cured and hardened and clamped between the housing shells.

Abstract: A control system for an internal combustion engine contains a novel programmed control function circuit which contains: an accumulation function circuit for developing an accumulation function representative of the duration for which the engine has been operating in selected operating modes; a transducer circuit which develops a signal representative of the instantaneous value of a selected engine operating parameter; and a modulation circuit which modulates the two to develop a programmed output signal which is utilized in controlling the engine. In the preferred embodiment, the accumulation function is representative of the duration for which the engine has been operating at idle and non-idle conditions and the selected operating parameter is engine manifold vacuum; the modulation circuit develops from these, a programmed vacuum advance signal utilized in controlling the spark timing advance for the ignition system of the engine.