An internal combustion engine wherein an HC treatment catalyst (12) having the function of adsorbing the HC in the exhaust gas is arranged upstream of the NOx selective reducing catalyst (14), an urea aqueous solution fed from the reducing agent feed valve (15) is arranged upstream of the HC treatment catalyst (12), urea, and NOx contained in the exhaust gas, and HC adsorbed on the HC treatment catalyst 12 are reacted with each other to form intermediate products having cyano groups, oximes, and amino groups, and these intermediate products are sent to the NOx selective reducing catalyst (14).

Exhaust purification device of internal combustion engine

In a spark ignition type internal combustion engine that includes a variable compression ratio mechanism A capable of changing the mechanical compression ratio, and a variable valve mechanism B capable of changing valve characteristics of an intake valve or an exhaust valve, the variable valve mechanism is mechanically coupled to the variable compression ratio mechanism, and the variable valve mechanism is controlled in accordance with the compression ratio-changing operation amount of the variable compression ratio mechanism. The variable valve mechanism is coupled to the variable compression ratio mechanism without intervention of an electronic control unit. Therefore, the possibility of the interference between a piston and an intake valve resulting from an abnormality in a control system that includes an electronic control unit as an intervening unit can be eliminated.

Spark ignition type internal combustion engine

An exhaust emission control device for an internal combustion engine, capable of supplying a just enough amount of reducing agent to a selective reduction catalyst even when a NOx purification ratio of the catalyst is changed by various causes, thereby enabling a high NOx purification ratio and very low exhaust emissions to be maintained. An ECU calculates a filtered value based on a signal from an exhaust gas concentration sensor, calculates a moving average value of a product of the filtered value and a reference input, calculates a control input such that the moving average value becomes equal to 0, and adds a reference input to the control input to calculate an FB injection amount. The ECU calculates an FF injection amount with a predetermined feedforward control algorithm, and adds the FF injection amount to the FB injection amount, to thereby calculate a urea injection amount.

Exhaust emission control device for internal combustion engine

An object of the invention is to provide an exhaust emission control device which eliminates the use of a heat-retention structure using heat-insulating material such as glass wool so as to attain substantial lessening in production cost. A discharge end of a gas gathering chamber is connected to an entry end of a mixing pipe so as to encase the entry end of the mixing pipe and close an opened end face in a required spaced-apart relationship. Moreover, a side surface of the entry end of the mixing pipe adjacent to the discharge side of the particulate filter is formed with an opening; and gas guide passages are formed in the gas gathering chamber by guide fins for tangential introduction of all of the exhaust gas from the discharge side of the particulate filter to the opening. An extra space isolated from the gas guide passages is ensured in the gas gathering chamber as a heat-retention chamber surrounding the entry end of the mixing pipe.

Exhaust emission control device

In an exhaust emission purifying apparatus for reductively purifying NOx in the exhaust emission by using a liquid reducing agent or its precursor, to be referred to as “liquid reducing agent” herein, a dosing flow rate of the liquid reducing agent according to engine operating conditions is computed, and the dosing of the liquid reducing agent is controlled based on the computed dosing flow rate, and also, it is judged whether or not a supply system of the liquid reducing agent is failed, based on a ratio between an integrated amount obtained by sequentially integrating the dosing flow rate and a consumed amount of the liquid reducing agent.

Exhaust Emission Purifying Apparatus for Engine

PROBLEM TO BE SOLVED: To provide an exhaust emission control device of an internal combustion engine, capable of suppressing metal corrosion of an addition valve due to boiling of a reducing agent remaining in the addition valve upon an automatic stop of engine operation and quickly starting injection of the reducing agent from the addition valve upon an automatic restart of the engine operationSOLUTION: An exhaust emission control device is applied to an internal combustion engine for performing an automatic stop and an automatic restart of engine operation, and includes: a urea-water addition valve for supplying urea water to an exhaust passage; and a urea-water supply pipe for supplying the urea water to the urea-water addition valve The device collects the urea water in the urea-water supply pipe when the engine operation is manually stopped by an OFF operation of an ignition switch, and collects an amount (a continuous line A) of the urea water less than a collection amount (a broken line B) of the urea water upon the manual control stop when the engine operation is automatically stopped

Exhaust emission control device of internal combustion engine

PROBLEM TO BE SOLVED: To provide an internal combustion engine having a supercharger with an electric motor capable of efficiently cooling a part to be cooled of the internal combustion engine by utilizing air supercharged by the supercharger with the electric motor as cooling air. SOLUTION: A cooling air introducing passage 52 for introducing a part of air supercharged by the supercharger 14 into the part to be cooled of the internal combustion engine such as catalyst 48 is provided. When necessity for cooling the part to be cooled is determined and it is determined that there is necessity for cooling from the results of determination, a change-over valve 18 is operated to open the cooling air introducing passage 52, and the electric motor 14c is operated to increase supercharging pressure of the supercharger 14. COPYRIGHT: (C)2006,JPO&NCIPI

Internal combustion engine having supercharger with electric motor

PROBLEM TO BE SOLVED: To provide an internal combustion engine with a supercharger capable of suppressing degradation of durability performance of an exhaust turbine while suppressing lowering of an engine output.SOLUTION: An internal combustion engine includes an exhaust turbine, an exhaust filter disposed at an exhaust downstream side with respect to an exhaust turbine in an exhaust passage and collecting PM in exhaust gas, a differential pressure sensor for detecting pressure difference ΔP between an exhaust upstream side and the exhaust downstream side of the exhaust filter in the exhaust passage, an atmospheric pressure sensor for detecting an atmospheric pressure PA, and an electronic control device. The electronic control device stops execution of filter regeneration control (S14), when the pressure difference ΔP reaches a lower limit value or less (S13:YES). Thus a PM accumulation amount is increased. Further when the atmospheric pressure PA is low, the electronic control device increases the lower limit value in comparison with that when the atmospheric pressure PA is high (S12).SELECTED DRAWING: Figure 6

Internal combustion engine with supercharger

PROBLEM TO BE SOLVED: To positively suppress overshoot of a boost pressure of a turbocharger in a controller of an internal combustion engine. SOLUTION: A rotation number sensor is assembled into a motor for assisting rotation of the turbocharger. By the rotation number sensor, the actual turbo rotation number is detected. By determining whether the detected actual turbo rotation number exceeds a target turbo rotation number or not, the overspeed of the turbocharger is detected (step 106). When the overspeed of the turbocharger is detected, the motor is driven in reverse (step 108). When the motor is driven in reverse, the turbo rotation number is reduced by a control torque generated by the motor. As a result, overshoot of the boost pressure is suppressed. COPYRIGHT: (C)2007,JPO&INPIT

Controller of internal combustion engine

PROBLEM TO BE SOLVED: To provide a twin turbo control device capable of improving supercharger transient response by smoothly performing a change-over from a small turbocharger to a large turbocharger SOLUTION: This invention relates to a control device for twin turbo adopted to an internal combustion engine 1, the twin turbo includes a large and a small turbocharger 10, 20 of different sizes, and the large turbocharger is provided with an electric rotation machine 25 assisting rotation of a turbine shaft Since the large turbocharger 20 is provided with the electric rotation assist machine 25, supercharger transient response can be improved by inhibiting drop of supercharging pressure by driving the electric rotation assist machine 25 and performing smooth the change-over when operation of the large turbocharger 20 is started from a condition where the small turbocharger 10 is driven COPYRIGHT: (C)2009,JPO&INPIT

Twin turbo control device

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