A fuel-injection pump, especially a direct fuel injection in spark-ignition internal-combustion engines, with at least one pump for generating a fuel flow under pressure and with a rotary slide valve moved synchronously with the drive shaft of the internal-combustion engine and intended for assigning the fuel flow to at least one injection port of the internal-combustion engine and/or for branching off the fuel flow under pump pressure into a return line, the rotary slide valve is mounted so as to be displaceable to a limited extent in the direction of its axis of rotation and/or so as to be rotatable to a limited extent in relation to the rotary drive of the rotary slide valve. Preferably, at the same time, the rotary position or displacement position of the rotary slide valve can be determined in dependence on an operating parameter of the internal-combustion engine, with the result that the axial displacement of the rotary slide valve counteracts a seizure of the rotary slide valve in its guide and determination in dependence on operating parameters affords the possibility of adjusting the injection time over a larger angular sector than would be possible in view of the geometrical limits placed on the design of the rotary slide valve.

Fuel injection pump for internal-combustion engines

A fuel pumping apparatus for supplying fuel to an internal combustion engine has a plurality of pumping plungers (19) which are housed in respective bores (17). The plungers are movable inwardly in the bores but during such movement one of the plungers moves to an outer position in which a fuel supply passage (21) which communicates with a fuel supply passage (21) which communicates with a fuel outlet (22) is uncovered to the pump working chamber (20) defined at the inner ends of the bores. Each bore has a supply passage associated therewith. A cam ring (25) is provided to impart inward movement of the plungers and the cam ring is provided with cam lobes (26) on its internal peripheral surface however one of the cam lobes is replaced by a recess which allows the plungers to move outwardly in turn so that fuel is distributed to the outlets which in use are connected to the injection nozzles of an engine.

Fuel pumping apparatus

A heat engine system for optionally combining various embodiments selected from those based on fuel injection to induce denser air delivery to a combustion chamber, direct injection of fuel into a combustion chamber, stratified charge fuel combustion, utilization of variable degrees of excess air to control peak combustion temperature, regenerative conversion of kinetic energy into fuel value, positive ignition by spark discharge, catalytic ignition, heated surface ignition, turbocharging, turbogenerating, moisture recovery by exduction, electrolysis, thermochemical regeneration, and electrothermochemical regeneration.

Method and apparatus for operation of combustion engines

An accurate thermodynamic model of an Active Lean NOx (ALNC) Catalyst is presented. The model takes into account hydrocarbon storage and release mechanisms of the ALNC, as well as the degradation in the ALNC hydrocarbon conversion efficiency due to ageing, and thus provides a more accurate estimate of an exotherm generated by hydrocarbon combustion in the ALNC. The estimated exotherm can them be used to detect system degradation and identify components responsible for the degradation.

Diesel aftertreatment systems

An exhaust gas purifying device for an engine comprises a catalyst arranged in the exhaust passage for purifying the exhaust gas, the catalyst having an oxidizing ability. An amount of sulfate adsorbed in the catalyst is obtained. When the adsorbed sulfate amount becomes larger than a predetermined amount, a reducing agent is fed to the catalyst temporarily to desorb the adsorbed sulfate from the catalyst and reduce the sulfate. At this time, the amount of the reducing agent is set to make the air-fuel ratio of the exhaust gas flowing into the catalyst rich.

Exhaust gas purifying device for engine

An exhaust gas recirculation (EGR) system of an internal combustion engine has an EGR cooler in an EGR passage connecting an exhaust manifold with an intake manifold. The EGR cooler cools EGR gas recirculated through the EGR passage. Cooling performance detecting means included in an electronic control unit (ECU) determines that cooling performance of the EGR cooler is degraded when intake pressure measured by an intake pressure sensor is lower than a normal intake pressure by at least a predetermined value. When the degradation of the cooling performance is detected, cooling performance regeneration controlling means included in the ECU increases the temperature inside the EGR cooler by heating the exhaust gas to eliminate soot or unburned hydrocarbon by oxidization. Thus, the cooling performance of the EGR cooler is regenerated.

Exhaust gas recirculation system having cooler

A New Method to Analyze Fuel Behavior in a Spark Ignition Engine

A method and apparatus for driving a capacitive-type load using a direct current power source, a charging circuit connected in series to the load, a discharging circuit connected in parallel to the load, and an electric circuit for controlling the charging and discharging circuits, and wherein at least one of the charging and discharging circuits has a primary coil, and a secondary coil coupled to the primary coil restores energy, generated when the charging or discharging is turned OFF, to the power source. This provides a highly efficient driving by a restoration of energy.

Method and apparatus for driving capacitive-type load

The permeability of a DPF 21 mounted on a diesel engine 1 is evaluated by calculating the apparent passage area (A) based upon a difference in the pressure between the upstream and the downstream sides of the DPF 21 and upon other engine data, an alarm is given to a driver based on the results of evaluation, and the operation mode is changed over to regenerate the DPF 21. An abnormal increase in the passage area caused by breakage is accurately detected, and it does not happen that the PM is released into the open air for extended periods of time due to the breakage of the DPF 21. Further, without the need of dismantling the DPF 21, the DPF 21 can be reliably burned and regenerated without being undesirably overheated in every operation mode of the engine 1.

Device for purifying exhaust gas of engines

A fuel supply system for a hydrogen gas engine, having a metal hydride tank in which pellets or powders of a metal hydride absorbing and storing alloy are stored. A heat exchange device is arranged in the tank in contact with the metal hydride therein. The heat exchange device is connected to a heating medium source, such as an engine water jacket, for supplying the heating medium to the heat exchange device, for separating hydrogen gas from the metal hydride. A fuel supply conduit is provided for connecting the metal hydride tank with the engine. A hydrogen gas flow control valve and a hydrogen gas flow meter are arranged in series in the conduit. A controller is provided for controlling the hydrogen gas flow control valve so that a desired amount of the hydrogen gas, as detected by the hydrogen gas flow meter, is obtained. A sub tank may be provided for storing an excess amount of hydrogen gas from the main tank, which is introduced into the engine via a sonic valve. An indicator for measuring an amount of hydrogen gas remaining, from the volume of the metal hydride, is also provided.

Kiyonori Sekiguchi

Papers

Exhaust gas recirculation system having cooler

A New Method to Analyze Fuel Behavior in a Spark Ignition Engine

Method and apparatus for driving capacitive-type load

Device for purifying exhaust gas of engines

Fuel supply system for an internal combustion engine