A fuel injection system for an internal combustion engine including a fuel injector which can be subjected to fuel at high pressure and is actuatable via a metering valve device by which the pressure in a pressure booster control chamber is controllable such that the pressure in a pressure booster pressure chamber, defined by a pressure booster piston, that can be filled with fuel from the high-pressure fuel source via a filling path in which a check valve is disposed and that is in communication with an injection valve member pressure chamber, is increased by the pressure booster piston such that an injection valve member opens for injecting fuel, whereupon fuel is positively displaced out of a damping chamber via a damping path, in which a damping throttle is disposed. To assure stable injection performance, the damping path is embodied such and connected in such a way to the filling path that the fuel positively displaced from the damping chamber via the damping throttle in an injection event reaches the filling path of the pressure booster pressure chamber via the damping path.

Fuel injection system

A catalyst for purifying exhaust gases exhibits not only effective purifying characteristics even in a low temperature range such as immediately after an engine starts but also high exhaust gas purifying ability. In the catalyst for purifying exhaust gases of a first aspect of the invention, HC adsorbed at low temperature are released at high temperature and the released HC are purified by a catalyst metal. This catalyst for purifying exhaust gases has an excellent advantage in purifying HC at low temperature as well as excellent exhaust gas purifying ability.

Catalyst for purifying exhaust gases

An exhaust gas aftertreatment installment and associated exhaust gas aftertreatment method utilizes a nitrogen oxide storage catalytic converter and an SCR catalytic converter. A particulate filter is provided upstream of the nitrogen oxide storage catalytic converter or between the latter and the SCR catalytic converter or downstream of the SCR catalytic converter. The time of regeneration operating phases of the nitrogen oxide storage catalytic converter can be determined as a function of the nitrogen oxide content of the exhaust gas downstream of the nitrogen oxide storage catalytic converter or of the SCR catalytic converter and/or as a function of the ammonia loading of the latter. Moreover, a desired ammonia generation quantity can be determined for a respective regeneration operating phase. The installation and method are adopted for use for motor vehicle internal combustion engines and other engines which are operated predominantly in lean-burn mode.

Exhaust Gas Aftertreatment Installation and Method

An exhaust gas purification device of an engine comprising a particulate filter arranged in an exhaust passage. An electric motor able to impart a vehicle drive power separate from the engine and able to generate electric power from the engine is provided. After the particulate filter finishes being warmed up, when the temperature of the particulate filter is low, the output torque of the engine is increased and the amount of increase of the output torque is consumed by the power generating action of the electric motor.

Exhaust gas purification device of an engine

A Model for Predicting Residual Gas Fraction in Spark-Ignition Engines

An exhaust gas cleaning device for an internal combustion engine comprising an NOx absorbing agent (18) disposed in the exhaust passage of the internal combustion engine for absorbing NOx when the air-fuel ratio of exhaust gas flowing thereinto is lean, while it discharges NOx so absorbed when the air-fuel ratio of exhaust gas flowing thereinto becomes a theoretical air-fuel ratio or rich, and an air-fuel ratio sensor (22) disposed downstream of the NOx absorbing agent (18) in the exhaust passage for judging that discharging of NOx from the absorbing agent (18) is completed when the air-fuel ratio detected by the air-fuel ratio sensor (22) has been switched from lean to rich after the air-fuel ratio of exhaust gas flowing into the absorbing agent (18) was switched from lean to rich.

Exhaust gas cleaning device for an internal combustion engine.

A device for varying a valve timing and lift for an internal combustion engine comprises a first valve lifter and a second valve lifter, and an oil pressure chamber being defined between the first valve lifter and the second valve lifter. The flow of oil from the oil pressure chamber is continuously and steplessly controlled through a high-speed response control valve in an oil extraction passage. While the oil is being removed, the valve does not lift. When the high-speed response control valve is closed, the first valve lifter and the second valve lifter move together and the valve begins to lift. By controlling the action of the actuator of the high-speed response control valve, the valve timing and lift of the poppet valve can be controlled to the optimum ones matching the engine operating conditions.

Device for varying a valve timing and lift for an internal combustion engine

An exhaust gas recirculation control system for an internal combustion engine including a diaphragm type exhaust gas recirculation control valve provided at a middle portion of a passage for conducting exhaust gases to be recirculated, the control valve being controlled by the fluid pressure supplied to its diaphragm chamber, wherein the fluid pressure is controlled to accord with a target value prepared to provide the optimum exhaust gas recirculation in various operating conditions of the engine and selected in accordance wtih the current operating conditions of the engine.

Exhaust gas recirculation control system for an internal combustion engine

Experiments were conducted with four cylinder production engines to evaluate the effect of EGR and mixture stoichiometry on NOx by measuring the burned gas ratio in the cylinder (BGR) by using a gas sampling valve and CO//2 gas analyzer. The total gas fuel ratio (G/F) in the cylinder, which is a function of air-fuel ratio (A/F) and BGR and is some measure of adiabatic combustion peak temperature of charge, was introduced as a new measure to evaluate the combustion in the cylinder. G/F ratio coupled with A/F could be utilized to evaluate the combustion characteristics such as NOx emission, misfire limit, etc. in various combustion chamber configurations. NOx emission and misfire limit are strongly affected by the BGR in the cylinder. Stoichiometrically burned gas EGR has the best potential to reduce NOx together with power for a fixed engine displacement, but from the point of view of fuel economy and misfire limit indicated by G/F, its mixture is the second to leanest A/F, when the critical constraint of NOx and better fuel economy were considered.

Evaluation of Burned Gas Ratio (BGR) as a Predominant Factor to NOx

PURPOSE:To efficiently purify NOX in exhaust gas together with CO and hydrocarbons(HC) by bringing the exhaust gas of oxygen-excess atmosphere into contact with a catalyst of platinum and lanthanum deposited on a porous carrier. CONSTITUTION:A catalyst of platinum and lanthanum as a rare earth metal deposited on a porous carrier is used as a catalyst which simultaneously effects oxidization of CO and HC and reduction of NOX in the exhaust gas from an automobile on which a lean-burn engine is mounted. The porous carrier is alumina, zeolite, zirconia, silica alumina, silica, etc., which carries lanthanum by 0.05-1.0mol/L. By bringing the exhaust gas of oxygen-excess atmosphere into contact with this catalyst, NOX, NO and HC in the exhaust gas can be purified both in a normal driving state and in a transition state.

Hidetaka Nohira

Papers

Exhaust gas cleaning device for an internal combustion engine.

Device for varying a valve timing and lift for an internal combustion engine

Exhaust gas recirculation control system for an internal combustion engine

Evaluation of Burned Gas Ratio (BGR) as a Predominant Factor to NOx

Purifying method of exhaust gas