摘要:
A plurality of pulse signals (trigger signals) responsive to driving of a power plant are directly supplied to respective adaptive control circuits each having an adaptive digital filter for controlling components of periodic or semi-periodic vibrations and noises ascribed to related component parts of a vibration/noise source. Further, the adaptive control is performed while varying a sampling frequency in response to changes in parameters of operating conditions of the power plant. Optionally, a control signal from the adaptive digital filter is corrected for gain. Further, periodic signal-eliminating means is provided for determining a transfer characteristic of a system to which the adaptive control is applied, based on a residual component signal from the periodic signal-eliminating means, a random signal having a low amplitude level, etc.
摘要:
A plurality of pulse signals (trigger signals) responsive to driving of a power plant (1) are directly supplied to respective adaptive control circuits (60,61,100) each having an adaptive digital filter (60) for controlling components of periodic or semi-periodic vibrations and noises ascribed to related component parts of a vibration/noise source. A periodic signal-eliminating means is provided for determining a transfer characteristic of a system to which the adaptive control is applied, based on a residual component signal from the periodic signal-eliminating means, a random signal having a low amplitude level, etc.
摘要:
A plurality of pulse signals (trigger signals) responsive to driving of a power plant are directly supplied to respective adaptive control circuits each having an adaptive digital filter for controlling components of periodic or semi-periodic vibrations and noises ascribed to related component parts of a vibration/noise source. Further, the adaptive control is performed while varying a sampling frequency in response to changes in parameters of operating conditions of the power plant. Optionally, a control signal from the adaptive digital filter is corrected for gain. Further, periodic signal-eliminating means is provided for determining a transfer characteristic of a system to which the adaptive control is applied, based on a residual component signal from the periodic signal-eliminating means, a random signal having a low amplitude level, etc.
摘要:
A fuel injection control system for a cylinder injection/spark ignition internal combustion engine (1) in which fuel is injected directly into cylinders through fuel injection valves (2). An ECU (6) determines a desired fuel injection amount (Qm) based upon the engine speed (Ne) and engine load (θACC), determines a desired fuel pressure (PFM) to be supplied to the fuel injection valves (2) and controls the actual fuel supply pressure (PF) to the desired fuel pressure (PFM). The ECU (6) causes the fuel to be injected when the crank angle of the engine (1) falls within a predetermined range (20 BTDC to 5 ° ATDC) in the vicinity of a top dead point (TDC) of the cylinder corresponding to the compression stroke thereof. Cylinder pressure is determined by sensor a (3), and the ECU (6) determines the actual amount of fuel (QSAMP) injected over time intervals substantially shorter than the injection period corresponding to the full desired fuel amount (QM), based on the difference between the injected fuel pressure and the cylinder pressure. This value is then subtracted from the desired fuel amount (QM) to control the termination of the fuel injection.
摘要:
A plurality of pulse signals (trigger signals) responsive to driving of a power plant (1) are directly supplied to respective adaptive control circuits (60,61,100) each having an adaptive digital filter (60) for controlling components of periodic or semi-periodic vibrations and noises ascribed to related component parts of a vibration/noise source. A periodic signal-eliminating means is provided for determining a transfer characteristic of a system to which the adaptive control is applied, based on a residual component signal from the periodic signal-eliminating means, a random signal having a low amplitude level, etc.
摘要:
A valve operating system in an internal combustion engine, that can be readily assembled and installed on the engine, including a casing (11) coupled to an upper surface of a cylinder head (5), an armature (12), a pair of electromagnets (13,14) for exerting electromagnetic forces on the armature in directions of opening and closing of an engine valve (V), and a pair of resilient means (15,16) for biasing the engine valve in the opening and closing directions, respectively, and for retaining the armature at a predetermined neutral position by cooperation with earth other during deenergization of both the electromagnets. The resilient means (16) for closing the engine valve is mounted between a retainer (38) fixed to the valve stem (8)and a fixed position on the cylinder head, and the electromagnets are fixed within the casing which is constructed so that an upper portion of the stem can be inserted into the casing. Accommodated within the casing are the armature (12) separatably coaxially connected at an upper end of the stem, and the resilient means (15) for opening the engine valve, which also serves to provide a resilient force for urging the armature against the first electromagnet to support the armature, when the armature is not connected to the stem.
摘要:
A fuel injection control system for a cylinder injection/spark ignition internal combustion engine (1) in which fuel is injected directly into cylinders through fuel injection valves (2). An ECU (6) determines a desired fuel injection amount (Qm) based upon the engine speed (Ne) and engine load (θACC), determines a desired fuel pressure (PFM) to be supplied to the fuel injection valves (2) and controls the actual fuel supply pressure (PF) to the desired fuel pressure (PFM). The ECU (6) causes the fuel to be injected when the crank angle of the engine (1) falls within a predetermined range (20 BTDC to 5 ° ATDC) in the vicinity of a top dead point (TDC) of the cylinder corresponding to the compression stroke thereof. Cylinder pressure is determined by sensor a (3), and the ECU (6) determines the actual amount of fuel (QSAMP) injected over time intervals substantially shorter than the injection period corresponding to the full desired fuel amount (QM), based on the difference between the injected fuel pressure and the cylinder pressure. This value is then subtracted from the desired fuel amount (QM) to control the termination of the fuel injection.
摘要:
A plurality of pulse signals (trigger signals) responsive to driving of a power plant are directly supplied to respective adaptive control circuits each having an adaptive digital filter for controlling components of periodic or semi-periodic vibrations and noises ascribed to related component parts of a vibration/noise source. Further, the adaptive control is performed while varying a sampling frequency in response to changes in parameters of operating conditions of the power plant. Optionally, a control signal from the adaptive digital filter is corrected for gain. Further, periodic signal-eliminating means is provided for determining a transfer characteristic of a system to which the adaptive control is applied, based on a residual component signal from the periodic signal-eliminating means, a random signal having a low amplitude level, etc.