Abstract: The invention relates to a sliding mode controller for controlling a controlled object system by using the adaptive sliding mode control. Also, the invention relates to an internal combustion engine system control device for controlling an internal combustion engine system by using the adaptive sliding mode control. The invention is characterized by comprising adaptive law input term learning means for learning an adaptive law input term so as to transfer an offset of a reaching law input term in the adaptive sliding mode control to the adaptive law input term.

Abstract: A control device for a diesel engine that is capable of restraining deterioration of a combustion state in a wide range of temperature environment conditions, in a diesel engine including an EGR device. In the control device for a diesel engine including the EGR device which recirculates exhaust gas from an exhaust passage to an intake passage, means for performing reduction correction that reduces an exhaust gas recirculation amount by the EGR device when the combustion state of the diesel engine is deteriorated, means for acquiring a temperature correlation value having a correlation with a cylinder temperature at a time of ignition of the diesel engine, and means for restricting execution of reduction correction when the temperature correlation value is smaller than a threshold value.

Abstract: The invention relates to a sliding mode controller for controlling a controlled object system by using the adaptive sliding mode control. Also, the invention relates to an internal combustion engine system control device for controlling an internal combustion engine system by using the adaptive sliding mode control. The invention is characterized by comprising adaptive law input term learning means for learning an adaptive law input term so as to transfer an offset of a reaching law input term in the adaptive sliding mode control to the adaptive law input term.

Abstract: An exhaust gas recirculation device of an internal combustion engine (1) including a low-pressure EGR passage (20), a high-pressure EGR passage (21), a low-pressure EGR valve (23) and a high-pressure EGR valve (24) further includes an air-fuel ratio sensor (12) that is disposed in the exhaust passage (4) upstream of the position of its connection with the low-pressure EGR passage (20). In the case where a predetermined fuel-cut condition is satisfied, an ECU (30) estimates the flow amounts of exhaust gas flowing in the low-pressure EGR passage (20) and the high-pressure EGR passage (21), on the basis of the oxygen concentrations acquired by the air-fuel ratio sensor (12) at timings at which the exhaust gases recirculated into the intake passage (3) via the low-pressure EGR passage (20) and via the high-pressure EGR passage (21) reach the air-fuel ratio sensor (12), respectively.

Abstract: The invention relates to a controlled object (63, 52) for variably controlling a control amount relating to the engine and an actuator for changing the operation state of the controlled object. The control device comprises means for determining a control signal to be given to the actuator for feedback controlling the driving state of the actuator to accomplish the target operation state. The control device changes the operation state of the controlled object by driving the actuator when no fuel is supplied to the combustion chamber, measures as a control amount change delay time, the time from the start of the driving of the actuator until the start of the control amount and sets a feedback gain used in the determination of the control signal by the actuator control means in consideration of the measured control amount change delay time.

Abstract: An exhaust-gas recirculation apparatus for an internal combustion engine has a high-pressure EGR passage (20), a low-pressure EGR passage (21), a high-pressure EGR valve (22), and a low-pressure EGR valve (24) and performs open-loop control to the low-pressure EGR valve (24). The flow rate (Ghpl) of EGR gas flowing in the high-pressure EGR passage (20) and the flow rate (Glpl) of EGR gas flowing in the low-pressure EGR gas (21) are estimated based on the oxygen concentration (O2s) in the gas at the portion of the intake passage (3) downstream of the portion to which exhaust gas is delivered from the high-pressure EGR passage (2), the flow rate (Gdpf) of the gas passing through an exhaust-gas purifying catalyst unit (11) provided in the exhaust passage between the exhaust-gas inlets of the high-pressure EGR passage (20) and the low-pressure EGR passage (21), the flow rate (Gafm) of fresh air, and the fuel amount (Q) supplied to the cylinders (2) of the internal combustion engine per unit time.

Abstract: An exhaust gas recirculation device of an internal combustion engine (1) including a low-pressure EGR passage (20), a high-pressure EGR passage (21), a low-pressure EGR valve (23) and a high-pressure EGR valve (24) further includes an air-fuel ratio sensor (12) that is disposed in the exhaust passage (4) upstream of the position of its connection with the low-pressure EGR passage (20). In the case where a predetermined fuel-cut condition is satisfied, an ECU (30) estimates the flow amounts of exhaust gas flowing in the low-pressure EGR passage (20) and the high-pressure EGR passage (21), on the basis of the oxygen concentrations acquired by the air-fuel ratio sensor (12) at timings at which the exhaust gases recirculated into the intake passage (3) via the low-pressure EGR passage (20) and via the high-pressure EGR passage (21) reach the air-fuel ratio sensor (12), respectively.

Abstract: An EGR cooler system according to the invention includes an EGR cooler cooling device that is provided in a coolant path which is separate from the path provided with an engine cooling system which cools coolant. The EGR cooler cooling devices cools the coolant to be supplied to a water-cooled EGR cooler. The EGR cooler system also includes a water pump that circulates the coolant within the coolant path; a bypass passage through which the coolant may bypass the EGR cooler cooling device or the water-cooled EGR cooler; and a flow control valve that regulates the amount of coolant flowing into the bypass based on the temperature of the coolant flowing through the coolant path.

Abstract: An EGR cooler system according to the invention includes an EGR cooler cooling device the is provided in a coolant path which is separate from the path provided with an engine cooling system which cools coolant. The EGR cooler cooling devices cools the coolant to be supplied to a water-cooled EGR cooler. The EGR cooler system also includes a water pump that circulates the coolant within the coolant path; a bypass passage through which the coolant may bypass the EGR cooler cooling device or the water-coolant EGR cooler; and a flow control valve that regulates the amount of coolant flowing into the bypass passage based on the temperature of the coolant flowing through the coolant path.