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.

Compression self-ignition type gasoline engine

Abstract: PROBLEM TO BE SOLVED: To provide a compressed self-ignition type gasoline engine wherein the discharge of unburnt fuel is reduce din the case of compressed self-ignition and combustion and its fuel efficiency is improved. SOLUTION: A tumble control valve 14 is disposed at the front eng part of a partition plate 18 partitioning the inside of an intake port 5 into upper and lower parts. In the case of compressed ignition and combustion, an upper intake passage is closed by the valve 14 for the purpose of causing reverse tumble flow within combustion chamber and densely distributing the fuel injected from a fuel injection valve 19 on the exhaust side of the inside of a cylinder, and open/close timing-variable means 16, 17 are controlled in order to get the timing of intake/exhaust valves 6, 8 into a minus-overlapped condition and internal ERG(exhaust gas recirculation) gas is distributed on the exhaust side of the inside of the cylinder for the temperature on the exhaust side of the inside of the cylinder to be higher than that on the intake side thereof in temperature distribution. Accordingly, compressed ignition is caused on the exhaust side and the exhaust valve 8 is closed in the process of an exhaust stroke. Consequently, the unburnt fuel on the intake side is carried over with the EGR gas to the next cycle. COPYRIGHT: (C)2001,JPO

Engine pumping loss control apparatus for locking intake or exhaust valves full open during regenerative braking hybrid vehicle

Abstract: An engine control apparatus for a hybrid vehicle reduces a shock and improves the fuel consumption rate when an engine is under a fuel cut control at the time of reducing a speed through an operation of a brake pedal. In case that all conditions are fulfilled, that is, the fuel cut control, the speed reduction of not less than a predetermined level, and the non-full charge state of a battery, the program locks an intake valve and an exhaust valve in full open position and carries out a regenerative control with a generator 14. This procedure enables a cylinder to be connected with an intake air conduit and an exhaust conduit via the passages of the intake valve and the exhaust valve, thereby preventing compression of a gas in the cylinder and effectively reducing friction.

Air supply control systems for internal combustion engines

Abstract: An air supply control system for an internal combustion engine comprises first and second turbosuperchargers, an exhaust cutoff valve operative to open and close one of separated exhaust passages in which a turbine of the second turbosupercharger is disposed, a first valve driving device for controlling the exhaust cutoff valve so that only the first turbosupercharger works when intake air mass flow fed to the engine is to be relatively small and both of the first and second turbosuperchargers work when the intake air mass flow is to be relatively large, an exhaust bypass valve operative to open and close an exhaust bypass passage provided for forming a partial exhaust passage detouring the exhaust cutoff valve, a second valve driving device for causing the exhaust bypass valve to open the exhaust bypass passage when intake air pressure applied to the engine reaches a predetermined value under a condition in which the intake air mass flow is to be relatively small, a waste gate valve operative to open and close a bypass passage provided for forming a partial exhaust passage detouring the turbines of the first and second turbosuperchargers, and a third valve driving device for causing the waste gate valve to open the bypass passage when the pressure of intake air reaches substantially the predetermined value under a condition in which the intake air mass flow is to be relatively large.

Cooking stove exhaust air filtration system

Abstract: An air filtration system for a cooking stove collects exhaust air from the stove with a vent hood, filters grease, particles and odors from the exhaust air and returns the filtered exhaust air to the room in which the stove is used. Exhaust air is cleansed of particles and odors by an activated charcoal filter within a return air conduit leading from the vent hood to the room. An electrically operated fan draws exhaust air into the vent hood, through grease filters and the activated charcoal filter and forces exhaust air back into the room. Regeneration of the activated charcoal filter is provided at selective intervals of time to maintain the effectiveness of the charcoal, and cooling of return air is provided for.

Method and apparatus for reducing exhaust emissions and improving fuel utilization in internal combustion engines

Abstract: Method and apparatus for providing a stratified charge of two constituents in the combustion chamber of an internal combustion engine when the engine is operated at less than full load to reduce all three undesirable exhaust emissions, i.e., hydrocarbons, carbon monoxide and oxides of nitrogen. One constituent of the stratified charge comprises exhaust gas, mixed with air if desired; and the other a fuel/air mixture, having exhaust gases mixed therewith if desired, to produce reduced quantities of oxides of nitrogen. The exhaust gas portion of the exhaust gas/air mixture provided in the combustion chamber at all partial engine loads is selected from that portion of the exhaust gases which was formed by the burning of the fuel/air mixture constituent of a previous stratified charge. At relatively heavy engine loads, when all of the exhaust gases formed by the burning of the fuel/air mixture constituent of a previous stratified charge cannot be recycled, a secondary selection is made to recycle either the bulk gases thereof (high in carbon monoxide) or the quench gases thereof (high in hydrocarbons) or all of one and as much of the other as possible. The relative amounts of the fuel/air mixture and exhaust gas/air mixture making up the stratified charge may be varied in response to accelerator position by auxiliary intake and exhaust timing valves which are actuated by variable timing control mechanism, with a maximum quantity of fuel/air mixture and a minimum quantity of exhaust gas/air mixture being introduced for full engine load, and vice versa for minimum load. During deceleration the fuel/air mixture intake can be completely cut off until engine idling speed is reached when, of course, a sufficient fuel/air mixture is again supplied to keep the engine running.