Abstract: A fuel injection nozzle of the outward opening poppet valve type includes a closure member reciprocable in the axial bore of a spray tip so as to control fuel flow therefrom and to form therewith an annular discharge spray orifice. The closure member includes a valve head with a pintle extending therefrom, the pintle having an annular groove therein that is located relative to the free end of the pintle so that during opening movement of the closure member this groove will not extend outward from the spray tip. The groove as thus located is operative to effect turbulent flow of the fuel being discharged and to act as a thermal barrier and is thus operative to substantially eliminate carbon build-up in the injection nozzle.

Abstract: An electromagnetic unit fuel injector includes a pump assembly having an externally actuated plunger reciprocable in a bushing means to define a variable volume pump chamber and a pressure actuated fuel injection nozzle. Fuel, at a suitable supply pressure, in a supply chamber is adapted to be in flow communication with the pump chamber by suitable passage means having a normally open, electromagnetic valve means controlling flow through a first portion thereof and a normally open servo control valve means, including a servo control valve and piston, controlling flow through a second portion thereof. Fuel injection during a pump stroke of the plunger is initiated by the controlled energization of the electromagnetic valve means to block return flow of fuel so as to effect closure of the servo control valve means whereby the fuel pressure can be further intensified to effect operation of the injection nozzle.

Abstract: A solenoid assembly, as for use in an electromagnetic fuel injector or similar valve assembly, and a method of making the same wherein a cylindrical pole piece is positioned in and fixed at one end to an apertured, cup-shaped solenoid housing so as to initially support and center a bobbin and solenoid coil assembly which is then secured in fluid tight relationship to the solenoid housing by an encircling encapsulant member molded in place.

Abstract: A flexible mask, used to plug with a cement material alternate passages in a honeycomb matrix structure whereby it can be used as a diesel particulate filter, has a base with spaced apart pins extending therefrom to fit into alternate cells of the honeycomb matrix, the base being provided with through apertures positioned intermediate adjacent associate pins for alignment with the other cells through which the cement material can be forced to plug the end of these cell openings.

Abstract: A compression operated diesel fuel injector, for use with an internal combustion engine, is provided with a compression operated piston that is associated with a pump cylinder and plunger to effect pressurization of fuel for discharge from the injector, the piston also defining with the associate injector housing a fuel control chamber. A solenoid actuated valve is operatively positioned to normally block the return flow of fuel from the fuel control chamber to the fuel reservoir for the engine and, a variable flow orifice means is operatively positioned downstream of this valve to control the return fuel flow pressure as a function of engine speed and load to thus regulate the return flow of fuel from the control chamber so as to thereby control engine compression operation of the piston and, accordingly, to correspondingly regulate the rate of fuel injection from the fuel injector.

Abstract: In an engine valve train, each rocker arm and its associate fulcrum are provided with cooperating inner and outer cylindrical surface contours carrying the reaction forces of rocker arm, the ratio of the radius of the outer surface contour being approximately in the order of 3:1 to 1.7:1 and preferably 2:1, the rocker arm and fulcrum having a cooperating retainer recess and pin, intermediate the ends of the associate bearing surface, to maintain alignment of these elements in substantially rolling contact with each other during pivotable movement of the rocker arm. In the preferred embodiment the radii of curvature of these bearing surfaces are selected in the ratio of 2:1 so as to obtain rolling motion known as cardanic motion, the recess being defined by opposed inclined flat surfaces and, the working surfaces of the pin being of semi-circular profile in substantial two-point contact with the surface defined by the recess.

Abstract: An electromagnetic fuel injector includes an electromagnet actuated flexible disc valve that is biased toward a closed position in seating engagement with an associate valve seat by a spring associated with the armature of a solenoid and is biased toward an open position relative to the valve seat by an opposed spring upon energization of the electromagnet.

Abstract: An electromagnetic unit fuel injector for use in a diesel engine includes a housing with a pump therein defined by an externally actuated plunger reciprocable in a bushing and defining therewith a pump chamber open at one end for the discharge of fuel to a spring biased, pressure actuated fuel injection nozzle. The pump chamber is also connected to a first chamber via a solenoid actuated, normally open, hollow, ported valve controlled passage to permit the ingress and egress of fuel. The first chamber adjacent to one end of the valve is in flow communication with a second chamber at the opposite end of the valve and these chambers are connected to a drain passage and supply passage, respectively. During a pump stroke, the solenoid can be energized to move the valve in position to block flow from the pump chamber to the first chamber so as to allow the pressurization of fuel by the pump to effect discharge of fuel from the injection nozzle.

Abstract: A diesel particulate trap comprising a ceramic monolith filter having inlet channels of decreasing cross-sectional flow area and increasing wall thickness relative to the distance from the inlet end to the outlet end of the filter.

Abstract: A diesel engine exhaust cleaner and burner system includes at least one exhaust cleaner member with a filter positioned therein to effect removal of particulates from a stream of exhaust gas delivered thereto via an inlet manifold. A fuel burner supplied with fuel by a fuel nozzle is operatively associated with the inlet manifold to supply the necessary heat to effect incineration of particulates collected on the filter. A cyclone duct providing a vortex chamber therein is operatively positioned downstream of the fuel nozzle and is supplied with sufficient air so as to effect both the complete combustion of the fuel and the controlled incineration of the particulates by increasing the residence time of the fuel in the reaction region within the vortex chamber and also effecting a more uniform distribution of the heat of combustion across the inlet face of the filter for the uniform heating of the particulates thereon to their combustion temperature.

Abstract: An exhaust cleaner and burner system for diesel engines provides for the trapping of particulates in the engine exhaust gases by their passage through a filter element. Collected particulates on the filter element are incinerated by the use of a heater means with the necessary air required for combustion of the particulates being drawn through the filter element by engine vacuum in the intake manifold of the engine. By throttling the air flow into the intake manifold so as to maintain a substantially constant depression therein, the required fuel burner mixture air flow needed for the combustion of carbonaceous particulates collected on a filter element is obtained during engine operation.

Abstract: A dual filter element exhaust cleaner and burner system for diesel engines provides for the trapping of particulates in the engine exhaust gases by their passage through filter elements, as selectively controlled by means of a four-way valve. Collected particulates in a non-active particulate filter element are incinerated by means of a heater, with this filter element, during incineration, being supplied with exhaust gases through a constant flow exhaust gas regulator whereby incineration of the particulates will occur at a controlled rate independent of engine speed.

Abstract: An electromagnetic diesel fuel injector of the type that is continuously supplied with pressurized fuel and having a pressure actuated injection nozzle at one end thereof is provided with a solenoid actuated spool valve means that is operative to selectively effect communication of the injection nozzle either with the pressurized fuel when the solenoid is energized or to a low pressure fuel drain conduit means when the solenoid is de-energized.

Abstract: An air management valve in the exhaust emission control system for the engine of an automotive vehicle is operative to selectively control secondary air flow to the exhaust manifold next adjacent to the exhaust ports of the engine, to the center of a dual bed catalytic converter and to the atmosphere.

Abstract: A secondary fuel metering control system for a normally solenoid valve controlled spill-inject-spill type engine driven fuel injection pump includes an isolation valve to control spill flow from the pump chamber of the pump back to the fuel reservoir, a pivotal metering valve operative to meter fuel flow to the pump chamber, and an actuator means including an operator actuated accelerator means and an electrical actuator for controlling pivotal movement of the metering valve.

Abstract: A hollow, truncated cone-shaped distribution skirt is positioned beneath a fuel injector discharging fuel into a throttle bore of a throttle body injection apparatus whereby to divide induction air flow into two flow paths so as to improve the distribution of the air-fuel mixture following through the throttle bore upstream of the pivotable throttle valve therein.

Abstract: An electromagnetic fuel injector has an axially fixed guide pin for axial alignment of a spring biased, movable armature. The guide pin has an abutment shoulder thereon for engagement with a surface of the armature whereby to serve as an abutment stop so as to establish a predetermined minimum working air gap between the opposed working surfaces of the armature and an associated solenoid pole. A spring seat nut is threaded onto external threads provided on the guide pin to serve as an abutment for one end of the armature spring. This nut is provided with non-circular conformations extending radially outward thereof which are slidably received in axially orientated slots in the solenoid pole to prevent rotation of the nut relative thereto. The guide pin is provided with an externally accessible driver-receiving head whereby it can be rotated to effect axial displacement of the spring seat nut whereby to adjust the force of the armature spring.

Abstract: An electric air control switching valve for use in controlling the delivery of secondary air from an engine driven air pump selectively, as a function of both engine operation and the operation of its associated emission control system, to either the exhaust manifold of an engine, preferably at a location closely adjacent to the exhaust ports of the engine, during low temperature engine operation, to the atmosphere, as at the dirty side of the air cleaner associated with the induction system of the engine, during low temperature engine deceleration, to a converter in the exhaust system for the engine downstream of the exhaust manifold during normal engine operation, or again to the atmosphere, as at the dirty side of the air cleaner, when the converter temperature exceeds a predetermined temperature.

Abstract: A three-part valve means is used in an electromagnetic fuel injector to control fuel flow out through a metering orifice, defined by the valve means in an open position relative to an associated valve seat, to an injector discharge orifice located closely downstream of the metering orifice. The three-part valve means includes a valve member provided with a flat surface on one end thereof and a semi-spherical seating surface at its opposite end for seating engagement with the valve seat; a movable armature having a flat at one end thereof for abutment against the flat surface of the valve member; and, a valve retainer operatively connected to the armature for supporting the valve member with its flat surface in abutment against the flat of the armature for movement therewith, the valve retainer permitting the flat surface of the valve member to move transversely relative to the flat of the armature.

Abstract: A valve control mechanism for effecting split engine operation of an internal combustion engine of the overhead valve type in which each valve is actuated by a rocker arm normally fulcrummed intermediate its ends on an apertured pivot bearing slidably supported on a mounting stud fixed to the cylinder head of the engine, with one end of the rocker arm engaging the stem of the valve to be actuated and its other end being engaged by a reciprocating push rod, the valve control mechanism including a slider support fixed to the mounting stud above the rocker arm, a spring engaged between the slider support and the pivot bearing to normally bias the pivot bearing toward an operative position whereat the rocker arm is pivotable about the pivot bearing, a stepped slider slidably supported by the slider support for movement between a first position at which the pivot bearing is in its operative position relative to the rocker arm and a second position permitting movement of the rocker arm to a position at which the ro