A control system for an internal combustion engine having at least one fuel injection valve for injecting fuel into a combustion chamber of the engine. A compression end temperature in the combustion chamber is estimated. A target compression end temperature is calculated according to an operating condition of the engine. A main injection and a plurality of pilot injections before the main injection are performed by at least one fuel injection valve. A fuel injection amount in a first-performed pilot injection of the plurality of pilot injections is controlled so that the estimated compression end temperature coincides with the target compression end temperature.

Control system for internal combustion engine

PROBLEM TO BE SOLVED: To prevent torque shock and vibration when starting an engine with a compact configuration utilizing a typical device for controlling various engines. SOLUTION: When starting the engine 2 is requested, by driving an air pump 30 before the starting, air inside an air intake passage 4 downstream of a throttle valve 10 of closed state is discharged into an exhaust passage 14 through a second passage 22 and a third passage 24 that are communicated by a three-way valve 28, and the engine 2 is started under a negative pressure state of the air intake passage 4 downstream of the throttle valve 10. After the engine 2 is started, when supplying secondary air for activating a catalyst 18 is requested, by driving the air pump 30, atmospheric air is supplied to the exhaust passage 14 as the secondary air through a first passage 20 and the third passage 24 that are communicated by a three-way valve 28. When the catalyst 18 is under an activation state and recirculation of the exhaust is requested, a part of the exhaust is recirculated to the air intake passage 4 from the exhaust passage 14 through the second passage 22 and the third passage 24 that are communicated by a three-way valve 28. COPYRIGHT: (C)2008,JPO&INPIT

Control device for engine

An apparatus for controlling an internal combustion engine has an amount-of-intake-air control unit for generating a command value for the opening of a flow control valve in an intake passage of the engine, which emits exhaust gases through a catalytic converter, so as to increase an amount of intake air introduced into a combustion chamber by a predetermined quantity greater when the engine operates in an idling mode after it has started to operate than when the engine operates in a normal idling mode, and controlling the opening of the flow control valve based on the generated command value, and an ignition timing control unit for controlling the ignition timing according to a feedback control process to correct the ignition timing so as to be retarded in order to converge the rotational speed of the engine to a predetermined target rotational speed while the amount of intake air is being increased. The amount-of-intake-air control unit successively acquires amount-of-heat data representing the amount of heat energy actually given to the catalytic converter by exhaust gases flowing into said catalytic converter while the amount of intake air is being increased, and corrects the command value for the opening of said flow control valve according to a feedback control process in order to converge the acquired amount-of-heat data to a predetermined target value representing an amount of heat energy to be given to said catalytic converter.

Apparatus for controlling internal combustion engine

Provided on an output rotating shaft of an internal combustion engine is a rotating member for generating signals corresponding to predetermined cylinder groups and signals for identifying a particular cylinder group, and the particular cylinder group is identified on the basis of these signals. At the time of start-up of the internal combustion engine, a fuel cutting mode or steady and constant speed running, an amount of fuel injection at a particular cylinder in the particular cylinder group is made to be different from those at the other cylinders in the particular cylinder group at a group injection timing, which references a particular cylinder assumed on the basis of a result of identification of cylinder groups, and rotational fluctuation and the result of identification of cylinder groups at that time are used to judge the truth of the above assumption and judgement of strokes and phases of the respective cylinders is used to identify a cylinder. At this time, an amount of control relating to a rotational frequency is regulated with respect to the other cylinders.

Cylinder judging device for internal combustion engine

An apparatus and method for adjusting a quantity of fuel delivered to an engine when an engine operating state transitions is provided. The apparatus and method includes determining a current steady-state quantity of fuel to be delivered to the engine and add a transitory quantity of fuel, based on a difference between a previous steady-state quantity of fuel delivered and the current steady-state quantity of fuel to be delivered, to the current steady-state quantity of fuel for a period of time following initiation of the transition. The invention also provides an apparatus and method by which an operator may adjust the amount of fuel delivered during an engine operating state transition.

An engine fuel delivery management system

PROBLEM TO BE SOLVED: To make it possible to be equipped with a new means instead of a bimetal gurd mechanism inexpensively, as a measure of an idle control system at the time when a water temperature sensor fails SOLUTION: The opening characteristics of a ISCV (idle control valve) are as follows: the opening is increased as the cooling water temperature THW is decreased, and the bypass air flow rate supplied to an engine is increased When a water temperature sensor fails, the duty value DOP for driving the ISCV is set to 50% to half-open the ISCV, and the bypass air flow rate supplied to the engine is switched to a neutral flow rate In this case, the neutral flow rate is the flow rate (duty value) which is above a lower limit guard, and below an upper limit guard in the full temperature range, and when the flow rate is within the range of these limits, the flow rate can be out of 50% Thus, by switching the bypass air flow rate to the neutral flow rate when the water temperature sensor fails, the worst states such as overrun, engine stop can be avoided, and the startability at low temperatures and the operability after warming can be ensured

Kaji Takashi

Papers

Control device for internal combustion engine