Secondary air injection

About: Secondary air injection is a research topic. Over the lifetime, 11452 publications have been published within this topic receiving 112147 citations.

Fuel injection control apparatus and fuel injection control method for internal combustion engine

Abstract: An internal combustion engine includes an in-cylinder injection valve and an intake passage injection valve. A control apparatus of the engine determines whether a catalyst located in an exhaust passage is in an overtemperature condition. When the catalyst is determined to be in the overtemperature condition, the control apparatus controls the injection valves to increase the amount fuel supplied to the cylinder compared to a case where the catalyst is determined not to be in the overtemperature condition. The control apparatus sets a mode for causing the injection valves to increase the amount of supplied fuel according to an operational state of the engine. For example, in a case where the component is determined to be in the overtemperature condition when the engine is operating in a fuel injection mode in which fuel is injected at least from the in-cylinder injection valve, at least the intake passage injection valve performs fuel injection for increasing the supplied fuel. Therefore, the catalyst is reliably prevented from being overheated.

Process for supplying air to a fuel cell system

Abstract: A process and an apparatus control output of an air-breathing fuel cell system which consists of an air supply line, a fuel cell, an air exhaust line, and a separate gas supply system for hydrogen gas. To control the fuel cell output, an adjustable rotary speed compressor is located in the air supply line and a variable absorption capacity expander is located in the air exhaust line. The compressor, the expander, and an additional electric motor are positioned on a common shaft. The expander converts the pressure energy contained in the exhaust air into mechanical energy and delivers that energy via the common shaft to the compressor. The air volume flow is controlled by the compressor rotary speed and adjusted to a preset value. A preset working pressure is established in the fuel cell system by adjusting the absorption capacity of the expander.

Spark ignition engine exhaust system

Abstract: An exhaust system for a spark ignition engine on an automotive vehicle including an exhaust filter (30) disposed downstream of a spark ignition engine for condensing hydrocarbons in exhaust gases from the engine during a first time period after start of the engine, a bypass structure (56, 58, 60, 66, 68, 70) for bypassing at least a portion of exhaust gases around the exhaust filter (30) to heat the exhaust filter during a second time period after the first time period and evaporate the condensed hydrocarbons, and a catalytic converter (18) disposed downstream of the exhaust filter (30) to oxidise the evaporated hydrocarbons and reduce NOX in exhaust gases passing therethrough.

Fuel injection controlling system for a diesel engine

Abstract: A fuel injection controller for a diesel engine to be mounted on an engine-operated vehicle, having a control unit which conducts computation to determine a total amount of fresh intake air per an engine cylinder through the computation of the sum of a residue amount of fresh air that remains in the computed amount of exhaust gas entering the engine cylinder and the computed amount of intake air, to obtain an amount of fuel injection under the total amount of fresh intake air, which defines a smoke generation limit as a basic limitative smoke generating fuel injection amount, to store the basic limitative smoke generating fuel injection amount as a stored basic limitative smoke generating fuel injection amount upon judging whether or not the engine comes into either accelerating or decelerating operation, to compare the stored basic limitative amount of fuel injection and the basic amount of fuel injection computed during the accelerating or decelerating operation to thereby determine a larger or smaller one of the compared basic amounts of fuel injection as a desired limitative smoke generating fuel injection amount from the time of judgment of the accelerating or decelerating operation of the engine, and to prevent an objective amount of fuel injection from exceeding the desired limitative smoke generating fuel injection amount from the time of the judgment of the accelerating or decelerating operation of the engine so that the objective amount of fuel injection is supplied to the engine.

Exhaust gas purifying system of internal combustion engine

Abstract: To optimally operate a NOx-occluded type catalytic converter installed in an exhaust passage of an internal combustion engine, there are employed an air/fuel ratio sensor for detecting an exhaust air/fuel ratio of the exhaust gas downstream of the converter; and a control device for controlling an air/fuel ratio of a combustible mixture fed to the engine. The control device comprises a first section for causing the converter to effect NOx-reduction treatment by making the air/fuel ratio of the combustible mixture richer and/or stoichiometric; and a second section for learning and correcting the condition of the NOx-reduction treatment, based on the exhaust air/fuel ratio detected by the sensor under the NOx-reduction treatment.