Abstract: The present invention relates to a fuel supply control apparatus and to a fuel supply control method, provided with an engine control unit and a fuel pump control unit. The engine control unit outputs an actuating signal for a fuel pump to the fuel pump control unit. The fuel pump control unit outputs a diagnostic signal indicating whether or not abnormality occurs in input of the actuating signal to the engine control unit. Furthermore, the engine control unit diagnoses whether or not abnormality occurs in input of the diagnostic signal and diagnoses based on the output signal from a fuel pressure sensor whether or not abnormality occurs in a control of fuel pressure. Then, the engine control unit performs a fail-safe function, based on whether or not the abnormality occurs in the input of the diagnostic signal, whether or not the abnormality occurs in the control of the fuel pressure, and whether or not the abnormality occurs in the input of the actuating signal in the fuel pump control unit.

Abstract: Control apparatus performs knocking suppression control in an internal combustion engine provided with a variable valve mechanism that is capable of varying a closing timing IVC of an inlet valve. The control apparatus, in a case in which an alcohol concentration and octane number of a fuel are low and knocking is likely to occur, controls the variable valve mechanism and retards the closing timing of the inlet valve from the bottom dead center TDC. Thereby, the effective compression ratio is reduced and knocking occurrence is consequently suppressed.

Abstract: Opening timing of the intake valve of an internal combustion engine is controlled to take a value within a range from 30° to 140° after the top dead center of intake stroke during a period of time before completion of engine warming-up from starting of an engine, and also, effective opening area of the intake valve is made smaller than the effective opening area thereof that occurs after completion of engine warming-up in order to increase the flow velocity of intake air entering through the intake valve, and at the same time, fuel is injected into a combustion chamber during at least one of a first period of time in which the flow velocity of intake air is high immediately after the intake valve is opened and a second period of time previous to the first period of time in which the flow velocity of intake air is high, and during a third period of time starting immediately before ignition timing.

Abstract: Opening timing of the intake valve of an internal combustion engine is controlled to take a value within a range from 30° to 140° after the top dead center of intake stroke during a period of time before completion of engine warming-up from starting of an engine, and also, effective opening area of the intake valve is made smaller than the effective opening area thereof that occurs after completion of engine warming-up in order to increase the flow velocity of intake air entering through the intake valve, and at the same time, fuel is injected into a combustion chamber during at least one of a first period of time in which the flow velocity of intake air is high immediately after the intake valve is opened and a second period of time previous to the first period of time in which the flow velocity of intake air is high, and during a third period of time starting immediately before ignition timing.

Abstract: In an engine provided with a variable valve event and lift mechanism that varies a valve lift and a valve operating angle of an intake valve, a pressure of fuel supplied to a fuel injection valve is controlled according to an opening period of the intake valve, which is varied according to the valve operating angle and an engine rotation speed.

Abstract: In a low rotation region of an engine, valve timing of two intake valves is advanced and also one of two exhaust valves is driven by means of a cam with valve lift lower than that of the other exhaust valve, to thereby set a valve overlap period within which only one of the two exhaust valves is opened.

Abstract: A piston for an internal combustion engine is provided. The engine has an intake port through which an intake air is introduced into the cylinder in a way as to produce a swirl that travels along while whirling about an axis transversal to an axis of the cylinder. The piston has at a crown face thereof a cavity that has a part-cylindrical bottom. The cavity has a longitudinal center axis extending obliquely to a crank axis so that the longitudinal center axis of the cavity nearly coincides with an axis along which the swirl travels within the cylinder.

Abstract: In an engine provided with a variable valve event and lift mechanism that varies a valve lift and a valve operating angle of an intake valve, a pressure of fuel supplied to a fuel injection valve is controlled according to an opening period of the intake valve, which is varied according to the valve operating angle and an engine rotation speed.

Abstract: A piston for an internal combustion engine is provided. The engine has an intake port through which an intake air is introduced into the cylinder in a way as to produce a swirl that travels along while whirling about an axis transversal to an axis of the cylinder. The piston has at a crown face thereof a cavity that has a part-cylindrical bottom. The cavity has a longitudinal center axis extending obliquely to a crank axis so that the longitudinal center axis of the cavity nearly coincides with an axis along which the swirl travels within the cylinder.

Abstract: In a low rotation region of an engine, valve timing of two intake valves is advanced and also one of two exhaust valves is driven by means of a cam with valve lift lower than that of the other exhaust valve, to thereby set a valve overlap period within which only one of the two exhaust valves is opened.

Abstract: In a negative pressure actuator which is provided with a negative pressure tank storing an intake negative pressure of an engine, and operated by a negative pressure stored in said negative pressure tank as a power source, an operating possible time of the negative pressure actuator is calculated based on an intake negative pressure, the operation of the negative pressure actuator is permitted when it is within the operating possible time, while the operation of the negative pressure actuator is prohibited when it is over the operating possible time.

Abstract: In a negative pressure actuator which is provided with a negative pressure tank storing an intake negative pressure of an engine, and operated by a negative pressure stored in said negative pressure tank as a power source, an operating possible time of the negative pressure actuator is calculated based on an intake negative pressure, the operation of the negative pressure actuator is permitted when it is within the operating possible time, while the operation of the negative pressure actuator is prohibited when it is over the operating possible time.

Abstract: Purge control valves are mounted to purge pipings arranged in parallel for supplying purge gas from a canister to an engine. A flow rate of the purge control valve having a larger flow rate size is controlled in a step mode, and a flow rate equal to or smaller than a variation quantity in said step mode is controlled by the purge control valve having a smaller flow rate size.

Abstract: Purge control valves are mounted to purge pipings arranged in parallel for supplying purge gas from a canister to an engine. A flow rate of the purge control valve having a larger flow rate size is controlled in a step mode, and a flow rate equal to or smaller than a variation quantity in said step mode is controlled by the purge control valve having a smaller flow rate size.

Abstract: When canister purge is started during feedback control of idle rotation speed, a feedback control value for immediately prior to starting purge is stored, and when purge is stopped, the feedback operating amount is changed stepwise up to the stored value.

Abstract: Purge control valves are mounted to purge pipings arranged in parallel for supplying purge gas from a canister to an engine. A flow rate of the purge control valve having a larger flow rate size is controlled in a step mode, and a flow rate equal to or smaller than a variation quantity in said step mode is controlled by the purge control valve having a smaller flow rate size.

Abstract: A purge passage is communicated to the upstream side of a compressor of a turbosupercharger, and on the other hand, a purge control valve and an electrically powered pump are mounted in the middle of said purge passage. Then, either a constant drive current is provided to said electrically powered pump, and the opening of the purge control valve is controlled in correspondence to the requested purged air flow rate, or the purge control valve is controlled to be fully opened, and the drive current of said pump is controlled in correspondence to the requested purged air flow rate.

Abstract: A three-way valve is mounted in the middle of a bypass passage bypassing the upstream and downstream of a compressor, and a purge passage is connected to the three-way valve. When the negative throttle pressure is equal to or above a predetermined value (close to vacuum), the recirculation of the supercharged pressure is performed through the bypass passage. On the other hand, when the negative throttle pressure is below the predetermined value, the purging of the canister is performed on the upstream side of the compressor through the bypass passage.