Abstract: Aspects of the disclosure are directed to controller for an internal combustion engine. The controller can, in each combustion cycle that composes a change cycle, calculate an average of control amounts from a first combustion cycle to an nth (1<=n<=N) combustion cycle and calculate an error of the average with respect to an average of a reference normal population. Further, the controller can set both a positive threshold and a negative threshold based on a standard error of the reference normal population in the case where the number of data is n. Subsequently, the controller can change the operation amount to make the error approach the positive threshold or the negative threshold when the error exceeds neither the positive threshold nor the negative threshold at any combustion cycle.

Abstract: A controller according to the present disclosure, in each combustion cycle that composes a change cycle, calculates the average ?n of control amounts from the first combustion cycle to the nth (1<=n<=N) combustion cycle and calculates the error ?n-?o of the average ?n with respect to the average ?o of a reference normal population. Also, the controller sets both a positive threshold Z?/2*?o/n1/2 and a negative threshold ?Z?/2*?o/n1/2 based on the standard error ?o/n1/2 of the reference normal population in the case where the number of data is n. Then, the controller chooses an operation amount to be changed from a plurality of operation amounts, based on a comparison between a series of the errors ?n-?o and a series of the positive thresholds Z?/2*?o/n1/2 and a comparison between the series of the errors ?n-?o and a series of the negative thresholds ?Z?/2*?o/n1/2.

Abstract: A control device for an internal combustion engine includes at least one processor and a memory configured to store a program. The at least one processor is configured to execute, by executing the program, a process of deciding a manipulated variable of the internal combustion engine from a control input value, in accordance with a predetermined conversion rule, a process of calculating a sample value of the controlled variable, a process of calculating a reference expectation value of the controlled variable from the control input value, a process of performing a hypothesis test for a null hypothesis that an average value of a predetermined number of recent sample values of sample values of the controlled variable is equal to the reference expectation value, and a process of modifying the conversion rule by an adaptive control when the null hypothesis is rejected.

Abstract: A controller according to the present disclosure, in each combustion cycle that composes a change cycle, calculates the average ?n of control amounts from the first combustion cycle to the nth (1<=n<=N) combustion cycle and calculates the error ?n-?o of the average ?n with respect to the average ?o of a reference normal population. Also, the controller sets both a positive threshold Z?/2*?o/n1/2 and a negative threshold ?Z?/2*?o/n1/2 based on the standard error ?o/n1/2 of the reference normal population in the case where the number of data is n. Then, the controller chooses an operation amount to be changed from a plurality of operation amounts, based on a comparison between a series of the errors ?n-?o and a series of the positive thresholds Z?/2*?o/n1/2 and a comparison between the series of the errors ?n-?o and a series of the negative thresholds ?Z?/2*?o/n1/2.

Abstract: A controller according to the present disclosure, in each combustion cycle that composes a change cycle, calculates the average ?n of a control amounts from the first combustion cycle to the nth (1<=n<=N) combustion cycle and calculates the error ?n??o of the average ?n with respect to the average ?o of a reference normal population. Also, the controller sets both a positive threshold Z?/2*?o/n1/2 and a negative threshold ?Z?/2*?o/n1/2 based on the standard error ?o/n1/2 of the reference normal population in the case where the number of data is n. Then, the controller changes the operation amount to make the error ?n??o approach the positive threshold Z?/2*?o/n1/2 or the negative threshold ?Z?/2*?o/n1/2 when the error ?n??o exceeds neither the positive threshold Z?/2*?o/n1/2 nor the negative threshold ?Z?/2*?o/n1/2 at any combustion cycle.

Abstract: A controller for an internal combustion engine includes a crank angle detector and an ECU. The ECU is configured to: (a) calculate a mass fraction burned; (b) acquire the crank angle, which is detected by the crank angle detector when the mass fraction burned reaches a predetermined mass fraction burned, as a specified crank angle; and (c) control at least one of an amount of fuel injected, an amount of intake air, or ignition energy on the basis of a first difference. The first difference is a difference between a first parameter and a second parameter. The first parameter is a crank angle period from an ignition time to the specified crank angle or a correlation value of the crank angle period. The second parameter is a target value of the crank angle period or a target value of the correlation value.

Abstract: A control apparatus for an internal combustion engine is configured, during a slightly stratified-charge lean-burn operation, to: calculate a basic total fuel injection amount based on a required torque; calculate a compression stroke injection amount based on an ignition delay index value; calculate, as a basic main injection amount, a value obtained by subtracting a compression stroke injection amount from the basic total fuel injection amount; calculate, based on an output value of an in-cylinder pressure sensor, an actual specified combustion index value that represents a main combustion speed or a combustion fluctuation rate; calculate a main injection correction term based on a result of a comparison between a target specified combustion index value or a tolerable specified combustion index value, and the actual specified combustion index value; and calculate a main injection amount by adding the main injection correction term to the basic main injection amount.

Abstract: A control device for an internal combustion engine according to the present application takes in and processes a signal of a knock sensor, and acquires a timing at which a significant change appears in the signal of the knock sensor from a result of the signal processing. The control device calculates a self-ignition start timing of regular combustion based on the timing at which the significant change appears in the signal of the knock sensor. The calculated self-ignition start timing is used in determination of an operation amount of an actuator for controlling an operation of the internal combustion engine, for example, a fuel injection timing.

Abstract: An internal combustion engine is provided that executes fuel injection and ignition with respect to a cylinder that remains stopped in an expansion stroke, and that performs ignition startup that starts up the internal combustion engine by rotationally driving a crankshaft by pressure of combustion accompanying the fuel injection. A motor generator (MG) that can rotationally drive the crankshaft is provided. A required assist torque Ast_trq exerted by the MG at the time of ignition startup is determined based on a maximum value Cyl_prss of an in-cylinder pressure that is detected by an in-cylinder pressure sensor at the time of ignition startup. The MG is controlled at the time of ignition startup based on the required assist torque Ast_trq that is determined.

Abstract: A control device for an internal combustion engine is provided that can detect the adherence of deposits to a cylinder pressure sensor without subjecting the internal combustion engine to an impact or the like. A control device for an internal combustion engine equipped with a cylinder pressure sensor detects changes in the sensitivity of the cylinder pressure sensor. If the control device detects a decrease in the sensitivity of the cylinder pressure sensor after detecting an increase in the sensitivity of the cylinder pressure sensor, the control device determines that deposits are adhered to the cylinder pressure sensor.

Abstract: A control apparatus for an internal combustion engine is configured, during a slightly stratified-charge lean-burn operation, to: calculate a basic total fuel injection amount based on a required torque; calculate a compression stroke injection amount based on an ignition delay index value; calculate, as a basic main injection amount, a value obtained by subtracting a compression stroke injection amount from the basic total fuel injection amount; calculate, based on an output value of an in-cylinder pressure sensor, an actual specified combustion index value that represents a main combustion speed or a combustion fluctuation rate; calculate a main injection correction term based on a result of a comparison between a target specified combustion index value or a tolerable specified combustion index value, and the actual specified combustion index value; and calculate a main injection amount by adding the main injection correction term to the basic main injection amount.

Abstract: A controller for an internal combustion engine includes a crank angle detector and an ECU. The ECU is configured to: (a) calculate a mass fraction burned; (b) acquire the crank angle, which is detected by the crank angle detector when the mass fraction burned reaches a predetermined mass fraction burned, as a specified crank angle; and (c) control at least one of an amount of fuel injected, an amount of intake air, or ignition energy on the basis of a first difference. The first difference is a difference between a first parameter and a second parameter. The first parameter is a crank angle period from an ignition time to the specified crank angle or a correlation value of the crank angle period. The second parameter is a target value of the crank angle period or a target value of the correlation value.

Abstract: An intra-cylinder pressure sensor fault diagnostic device that ensures an opportunity for fault diagnosis in a wide operation region, and can accurately detect an intra-cylinder pressure with a high S/N ratio. The fault diagnostic device for an intra-cylinder pressure sensor, which outputs a value corresponding to an intra-cylinder pressure of an internal combustion engine delays ignition timing so that firing timing comes after a compression top dead center to generate peaks of the intra-cylinder pressure before firing and after firing respectively. When the ignition timing is delayed, at least one of an output value of the intra-cylinder pressure sensor in the peak of the intra-cylinder pressure before firing (hereinafter, called a pre-firing output peak value) and a crank angle thereof is detected. A fault of the intra-cylinder pressure sensor is determined by using at least one of the pre-firing output peak value and the crank angle thereof.

Abstract: A control device for an internal combustion engine is provided that can detect the adherence of deposits to a cylinder pressure sensor without subjecting the internal combustion engine to an impact or the like. A control device for an internal combustion engine equipped with a cylinder pressure sensor detects changes in the sensitivity of the cylinder pressure sensor. If the control device detects a decrease in the sensitivity of the cylinder pressure sensor after detecting an increase in the sensitivity of the cylinder pressure sensor, the control device determines that deposits are adhered to the cylinder pressure sensor.

Abstract: An internal combustion engine is provided that executes fuel injection and ignition with respect to a cylinder that remains stopped in an expansion stroke, and that performs ignition startup that starts up the internal combustion engine by rotationally driving a crankshaft by pressure of combustion accompanying the fuel injection. A motor generator (MG) that can rotationally drive the crankshaft is provided. A required assist torque Ast_trq exerted by the MG at the time of ignition startup is determined based on a maximum value Cyl_prss of an in-cylinder pressure that is detected by an in-cylinder pressure sensor at the time of ignition startup. The MG is controlled at the time of ignition startup based on the required assist torque Ast_trq that is determined.

Abstract: A control apparatus for an internal combustion engine includes an in-cylinder pressure sensor for detecting an in-cylinder pressure. In-cylinder heat release amount data is calculated based on in-cylinder pressure data synchronized with the crank angle that is sampled using the in-cylinder pressure sensor. If the number of items of the heat release amount data that are located in a combustion period identified using the heat release amount data is two or more, the control apparatus determines that the in-cylinder pressure data that is sampled in synchronization with the crank angle is reliable and the engine can be controlled accordingly.

Abstract: In a control device for an internal combustion engine according to the present embodiment, the control device includes: cooling units arranged on a path where a coolant is circulated, and cooling an exhaust gas of an engine with the coolant flowing through the cooling units; an atmospheric pressure sensor detecting an atmosphere pressure; and ECUs deciding whether or not to perform an exhaust gas temperature control for suppressing a temperature of the exhaust gas based on whether or not a heat quantity is more than a decision value, and correcting the decision value to be lower as the atmosphere pressure is lower.

Abstract: An object of the present invention is to be able to execute motor assist only when it is necessary at a time of starting an engine, and drive a motor efficiently. An engine 10 includes a starter motor 34 for aiding in starting, and performs motor assist by the starter motor 34 in accordance with necessity when the engine is to start independently by combustion. An ECU 50 predicts a torque T1 that is generated in an initial explosion cylinder at a time of starting before actual combustion, and performs independent starting without driving the motor 34, when the prediction torque T1 is a starting request torque Ts1 or more. When the prediction torque T1 is less than the starting request torque Ts1, the ECU 50 drives the motor 34 and performs starting by motor assist. Thereby, power consumption of a battery and the like can be suppressed by decreasing wasteful drive of the motor, and the starter motor 34 can be efficiently driven while startability is secured.

Abstract: This invention determines whether or not an internal combustion engine is not performing combustion. If the determined result is that the internal combustion engine is not performing combustion, a maximum in-cylinder pressure Pmax during motoring is identified by an in-cylinder pressure sensor, and a crank angle ?Pmax corresponding to the maximum in-cylinder pressure Pmax is detected by a crank angle sensor. Further, a reference crank angle ?Pmaxtgt corresponding to the engine speed and the engine load factor is identified, and ?Pmax is corrected so as to become ?Pmaxtgt. Furthermore, the relation between a signal of the crank angle sensor and a crank angle (measured value) corresponding to the signal is corrected so that a measured value of the crank angle corresponding to Pmax becomes the post-correction crank angle.

Abstract: This invention determines whether or not an internal combustion engine is performing combustion, and if the determined result is that the engine is not performing combustion, it is determined whether or not the engine revolution speed is greater than a predetermined revolution speed NEth. If it is found that the relation that the revolution speed>predetermined revolution speed NEth holds, an in-cylinder maximum pressure value Pmax during motoring is identified by an in-cylinder pressure sensor 34, a crank angle ?Pmax corresponding to the relevant Pmax is detected by a crank angle sensor 42, and the crank angle is corrected so that ?Pmax becomes TDC. Further, the crank angle correction amount is learned, and the relation between the signal of the crank angle sensor 42 and the actual crank angle (measured value) corresponding thereto is corrected.