Abstract: A method comprises determining that an aftertreatment system is in a cold-operation mode; initiating a low engine-out NOx (LEON) mode by controlling a component of a vehicle containing the aftertreatment system to decrease an instantaneous engine out NOx (EONOx) amount and to increase exhaust energy relative to a normal operation mode for an engine of the vehicle; receiving information indicative of an operating status of the vehicle during the LEON mode; disengaging the LEON mode; subsequent to disengaging the LEON mode, initiating a thermal management (TM) mode for the aftertreatment system, wherein the TM mode is initiated by controlling a component of the vehicle to increase fueling to the engine for a power level by reducing engine efficiency and directing excess fuel to the aftertreatment system; receiving information indicative of an operating status of the vehicle during the TM mode; and disengaging the TM mode.

Abstract: Disclosed herein is a class of gas carburettor (9) for low calorific value gas for A/F ratio control to be used engines operating on producer gas with a load following capabilities. The gas carburettor has A/F ratio from 1.2:1 for producer gas to about 5:1 for biogas. The gas carburettor of the present invention has right A/F control at varying load conditions due to its optimized dimensions at the throat (7) and area ration control flapper (6) along with the zero pressure regulators. Additionally, using a by-pass facility starting the engine is established. By the use of a zero pressure regulator on the gas line, the gas pressure in the air and gas lines are maintained nearly the same downstream of the carburettor which helps in managing the appropriate air-to-fuel ratio based on the gas and air passage areas.

Abstract: The present invention relates to a method of estimating the fuel/air ratio in each cylinder of an injection internal-combustion engine comprising an exhaust circuit on which a detector measures the fuel/air ratio of the exhaust gas. An estimator based on a Kalman filter is coupled with a physical model representing the expulsion of the gases from the cylinders and their travel in the exhaust circuit to the detector. The method has application to engine controls.

Abstract: In a direct injection diesel engine in which fuel to be sprayed during a primary injection is split and sprayed at a plurality of timings at a point of time near top dead center of a compression stroke of a cylinder, a judger judges that a completion timing of the primary injection is later than a point of time corresponding to 35° after top dead center of a compression stroke when the primary injection is split while an engine is operated. Upon such a judgment, a split number of the primary injection and an injection intermission interval are reduced by a corrector to advance the injection completion timing. Further, an amount of fuel to be sprayed during the primary injection is reduced for correction, and a part of the fuel is preliminarily sprayed during the second half of the compression stroke of the cylinder by an auxiliary injection controller so as to respond to such a correction.

Abstract: A rotary internal combustion engine having a plurality of pairs of angled pistons, each pair having a power piston and a corresponding supply piston. As the power piston of a pair fires to provide rotation for the engine, the corresponding supply piston draws a fresh fuel air charge from the center section of the engine. As the supply piston compresses the fuel air mixture, the mixture is delivered at the top of the power cylinder for the next firing. The exhaust port is located at the bottom of the power piston stroke and the fuel intake is at the top of the cylinder, to increase the efficiency of the engine. Roller bearings are mounted between each cylinder block and an engine outer casing to support the engine.

Abstract: A fuel control system for an engine, and particularly one that employs a gaseous fuel and which controls the air-fuel ratio by a feedback control system. The feedback control system is adjusted by a corrective factor that is determined by engine running conditions so as to obtain better control over the desired fuel-air mixture.

Abstract: An air-fuel ratio control system for an internal combustion engine including a carburetor having a main fuel system, a slow fuel system, a main bleed air passage leading to the main fuel system a main bleed air control passage leading to the main fuel system, a slow bleed air passage leading to the slow fuel system, and a slow bleed air control passage leading to the slow fuel system, and a valve for controlling the amount of bleed air supplied through the main and slow bleed air control passages.

Abstract: Flow passage lines are used to connect the float chamber of a conventional carburetor both to the engine's intake and exhaust manifold. The gas flow produced by the exhaust manifold provides a continuous source of positive pressure to the float chamber, while the engine's suction and the corresponding vacuum in the intake manifold provide a continuous source of negative pressure. The flow rates in the positive pressure line and in the negative pressure line are regulated by means of two control solenoid valves. The pressure in the float chamber reflects the net impact of the positive and negative pressures transmitted trough the lines. The solenoid valves are responsive to a control signal generated by an electronic circuit as a function of deviations in the oxygen content of the exhaust gases from a desired set point. The ambient pressure in the float chamber is either increased or decreased as the oxygen sensor indicates that either a lean or a rich fuel mixture is being combusted in the engine.

Abstract: Flow passage lines are used to connect the float chamber of a conventional carburetor both to the engine's intake manifold and to a tube positioned downstream of the radiator fan. The air flow produced by the fan provides a continuous source of positive pressure to the float chamber, while the engine's suction and the corresponding vacuum in the intake manifold provide a continuous source of negative pressure. The flow in the positive pressure line and in the negative pressure line is regulated by means of two control solenoid valve. The two valves operate cyclically and off-phase, so that when the pressure valve is closed the vacuum valve is open, and vice versa. The pressure in the float chamber reflects the net impact of the positive and negative pressures transmitted through the lines. The solenoid valves are responsive to a control signal generated by an electronic circuit as a function of deviations in the oxygen content of the exhaust gases from a desired set point.

Abstract: Flow passage lines are used to connect the float chamber of a conventional carburetor both to the engine's intake manifold and to a tube positioned downstream of the radiator fan. The air flow produced by the fan provides a continuous source of positive pressure to the float chamber, while the engine's suction and the corresponding vacuum in the intake manifold provide a continuous source of negative pressure. The positive pressure line is constantly open to the float chamber and is also connected to the negative pressure line by means of a control solenoid valve. When the valve is closed, the pressure in the float chamber reflects the full impact of the positive pressure differential generated by the radiator fan.

Abstract: Two embodiments of air/fuel ratio adjusting systems for gaseous-fueled internal combustion engines. In each embodiment, a pressure regulator supplies regulated fuel in gaseous form from a source in which it is stored in a liquid form to a charge former that has a fuel control device such as a needle valve. The air/fuel ratio is maintained constant by mixing atmospheric air with the fuel before the charge former fuel control device under the control of an oxygen sensor in the exhaust system. In one embodiment, an enrichment system is also incorporated for supplying enrichment fuel under acceleration or cold starting conditions.