Abstract: An ECU acquires a fluid temperature, a coolant temperature and a soak time, and determines whether vapors have been produced in a fuel supply device on the basis of a vapor production prediction map. When the ECU determines that vapors have been produced in the fuel supply device, the ECU reduces a feedback gain. Subsequently, the ECU predicts a vapor production time, and, when the ECU determines that a vapor production end time has been reached, executes normal feedback control.

Abstract: When a working angle of an intake valve is increased in accordance with a deficiency in a working fluid pressure of a VVT mechanism, an electronic control unit corrects an opening degree of a throttle valve so as to increase an intake air amount, and thereby restraining the intake air amount from decreasing in accordance with the increase in the working angle with a valve timing of the intake valve retarded, and hence suppressing a fall in an engine rotational speed.

Abstract: An ECU acquires a fluid temperature, a coolant temperature and a soak time, and determines whether vapors have been produced in a fuel supply device on the basis of a vapor production prediction map. When the ECU determines that vapors have been produced in the fuel supply device, the ECU reduces a feedback gain. Subsequently, the ECU predicts a vapor production time, and, when the ECU determines that a vapor production end time has been reached, executes normal feedback control.

Abstract: When a working angle of an intake valve is increased in accordance with a deficiency in a working fluid pressure of a VVT mechanism, an electronic control unit corrects an opening degree of a throttle valve so as to increase an intake air amount, and thereby restraining the intake air amount from decreasing in accordance with the increase in the working angle with a valve timing of the intake valve retarded, and hence suppressing a fall in an engine rotational speed.

Abstract: An electronic control unit 40 calculates a target output torque of an internal combustion engine 10 based on a manipulation amount of an accelerator pedal 60, a vehicle speed, and a state of a transmission gear ratio of an automatic continuously variable transmission 30, and calculates a target opening of a throttle valve 14 based on the calculated target output torque. If the current value of the transmission gear ratio of the automatic continuously variable transmission 30 is smaller than a predetermined value, the target opening of the throttle valve 14 calculated based on the target output torque is limited to be less than or equal to a preset upper limit.

Abstract: A valve characteristic controller including an oil pump, a valve timing varying mechanism, and a valve timing control unit is disclosed. The valve timing varying mechanism varies the valve characteristic value of intake valves in an engine based on the hydraulic pressure of hydraulic oil supplied from the oil pump. The valve timing control unit includes a storage and a detector. The storage stores computation maps used to calculate a target value for the valve characteristic value based on a plurality of engine control values. The detector detects the temperature of the hydraulic oil. The computation maps include a first map and a second map. The varying amount of the valve characteristic amount corresponding to a change in the engine control value in a low speed range of the engine speed is set to be smaller in the second map than the first map.

Abstract: A valve characteristic controller including an oil pump, a valve timing varying mechanism, and a valve timing control unit is disclosed. The valve timing varying mechanism varies the valve characteristic value of intake valves in an engine based on the hydraulic pressure of hydraulic oil supplied from the oil pump. The valve timing control unit includes a storage and a detector. The storage stores computation maps used to calculate a target value for the valve characteristic value based on a plurality of engine control values. The detector detects the temperature of the hydraulic oil. The computation maps include a first map and a second map. The varying amount of the valve characteristic amount corresponding to a change in the engine control value in a low speed range of the engine speed is set to be smaller in the second map than the first map.

Abstract: A vehicle includes an engine-driven oil pump, which is driven by the rotation of an output shaft of an internal combustion engine, a variable valve timing apparatus, which operates based on hydraulic pressure supply provided by the oil pump, and a continuously variable transmission capable of continuously varying the transmission gear ratio. An electronic control unit sets the transmission gear ratio of the continuously variable transmission based on the operating state of the vehicle. The electronic control unit changes the transmission gear ratio, which is set based on the operating state of the vehicle, in such a manner that the engine speed is increased when the hydraulic pressure supply via the hydraulic oil provided from the oil pump to the variable valve timing apparatus is low.

Abstract: An electronic control unit 40 calculates a target output torque of an internal combustion engine 10 based on a manipulation amount of an accelerator pedal 60, a vehicle speed, and a state of a transmission gear ratio of an automatic continuously variable transmission 30, and calculates a target opening of a throttle valve 14 based on the calculated target output torque. If the current value of the transmission gear ratio of the automatic continuously variable transmission 30 is smaller than a predetermined value, the target opening of the throttle valve 14 calculated based on the target output torque is limited to be less than or equal to a preset upper limit.

Abstract: When the engine output request is increased in a state in which the valve closing timing of an intake valve (9) is before intake BDC, a target value (LT) for the maximum lift of an intake valve is changed straight away, regardless of the actual air intake amount, to a value which makes the valve closing timing of the valve become a timing which is after the BDC and is spaced away from the BDC. In this case, by drive controlling a variable valve operating mechanism (14) based upon the target value (LT), the valve closing timing of the intake valve (9) is changed straight away from before the intake BDC to after the intake BDC, which shortens the time period in which, during this changing process, the valve closing timing of the intake valve (9) is present in the vicinity of the intake BDC as much as possible.

Abstract: When the engine output request is increased in a state in which the valve closing timing of an intake valve (9) is before intake BDC, a target value (LT) for the maximum lift of an intake valve is changed straight away, regardless of the actual air intake amount, to a value which makes the valve closing timing of the valve become a timing which is after the BDC and is spaced away from the BDC. In this case, by drive controlling a variable valve operating mechanism (14) based upon the target value (LT), the valve closing timing of the intake valve (9) is changed straight away from before the intake BDC to after the intake BDC, which shortens the time period in which, during this changing process, the valve closing timing of the intake valve (9) is present in the vicinity of the intake BDC_as much as possible.

Abstract: An apparatus and method for controlling the intake air amount in an internal combustion engine provided with a throttle valve and an intake air amount changing means linked with the same, the intake air amount control apparatus and method of an internal combustion engine finding a target intake air amount mcta based on an accelerator opening degree and engine speed (step 101), determining a target setting Cvta for said intake air amount changing means based on at least said target intake air amount (step 103), and finding a target throttle opening degree ?tta based on model equations creating a model of an engine intake system and expressing the air passing through the engine intake system from said target intake air amount mcta and the target setting Cvta (step 107).

Abstract: A valve performance controller for use in an engine that performs ignition timing retardation control to prevent knocking. The controller variably controls valve performance of an intake valve in accordance with an operation state of the engine. The controller corrects a control target so that the compression end temperature of a combustion chamber decreases when a retardation amount of the ignition timing obtained through the retardation control is greater than a predetermined value. The correction is performed only when the engine performance degradation that would occur when the ignition timing is retarded in a state in which the control target is uncorrected is predicted to be greater than the engine performance degradation that would occur when the control target is corrected.

Abstract: An apparatus and method for controlling the intake air amount in an internal combustion engine provided with a throttle valve and an intake air amount changing means linked with the same, the intake air amount control apparatus and method of an internal combustion engine finding a target intake air amount mcta based on an accelerator opening degree and engine speed (step 101), determining a target setting Cvta for said intake air amount changing means based on at least said target intake air amount (step 103), and finding a target throttle opening degree ?tta based on model equations creating a model of an engine intake system and expressing the air passing through the engine intake system from said target intake air amount mcta and the target setting Cvta (step 107).

Abstract: An ignition timing control apparatus for an engine includes a controller that sets an ignition timing considering a change of a temperature or a pressure in a combustion chamber at a time when an opening/closing characteristic of an intake valve is changed, the opening/closing characteristic including a valve opening timing and a valve closing timing at least one of which is changed by a variable valve mechanism for the engine.

Abstract: An ignition timing control apparatus for an engine includes a controller that sets an ignition timing considering a change of a temperature or a pressure in a combustion chamber at a time when an opening/closing characteristic of an intake valve is changed, the opening/closing characteristic including a valve opening timing and a valve closing timing at least one of which is changed by a variable valve mechanism for the engine.

Abstract: A knocking control apparatus for an internal combustion engine, which is applied to an internal combustion engine including a variable valve mechanism that can vary a valve characteristic of at least one of an intake valve and an exhaust valve, and which changes an engine control amount based on a result of a knocking determination as to whether knocking occurs, includes a controller which performs the knocking determination as to whether knocking occurs based on an output signal from a knock sensor that detects a vibration occurring in the internal combustion engine, and which changes a mode of the knocking determination according to a change in a combustion state of an air-fuel mixture, the change being caused by a change in the valve characteristic.

Abstract: A valve performance controller for use in an engine that performs ignition timing retardation control to prevent knocking. The controller variably controls valve performance of an intake valve in accordance with an operation state of the engine. The controller corrects a control target so that the compression end temperature of a combustion chamber decreases when a retardation amount of the ignition timing obtained through the retardation control is greater than a predetermined value. The correction is performed only when the engine performance degradation that would occur when the ignition timing is retarded in a state in which the control target is uncorrected is predicted to be greater than the engine performance degradation that would occur when the control target is corrected.

Abstract: A knocking control apparatus for an internal combustion engine, which is applied to an internal combustion engine including a variable valve mechanism that can vary a valve characteristic of at least one of an intake valve and an exhaust valve, and which changes an engine control amount based on a result of a knocking determination as to whether knocking occurs, includes a controller which performs the knocking determination as to whether knocking occurs based on an output signal from a knock sensor that detects a vibration occurring in the internal combustion engine, and which changes a mode of the knocking determination according to a change in a combustion state of an air-fuel mixture, the change being caused by a change in the valve characteristic.

Abstract: A knock detection device that can not only detect knock accurately, but can also detect heavy knock quickly. Cylinder pressure is detected by a pressure sensor installed in each cylinder in an internal combustion engine. AS the occurrence or non-occurrence of heavy knock is determined based on the ratio between the maximum value of cylinder pressure fluctuation and the maximum value of cylinder pressure divided by a prescribed value, it becomes possible to detect the occurrence of heavy knock quickly. If it is determined that heavy knock has occurred, a knock suppression measure involving, for example, reducing the spark advance angle, is immediately applied, thus preventing damage to the internal combustion engine.