摘要:
An actuator for moving heads in a disk unit having heads for reading or writing data from or on recording surfaces of disks driven to rotate, an actuator having arms for supporting the heads, a main FPC board having one end thereof supported by the actuator and the other end thereof supported by a body of the disk unit, and relay FPC boards placed along the arms of the actuator, which can realize a compact and thin size, resistive to noise, and permitting a reduction in manufacturing cost. A printed-circuit board is supported by an actuator, is electrically connected to a circuit unit in a body of a disk unit via a main FPC board, and is electrically connected to heads via relay FPC boards. Integrated circuits are mounted on the printed-circuit board.
摘要:
A head IC adjusts an amplitude level of a read signal of a head and outputs to a read channel having an AGC amplifier, includes an AGC amplifier. The AGC amplifier has a feedback loop control type first amplifier and a feed-forward control type second amplifier. The precision of control with respect to a target value is improved, and an AGC amplifier with fast response can be configured. Further, increases in the AGC pull-in type can be prevented, stability can be assured, and erroneous AGC judgments can be prevented.
摘要:
An engine exhaust gas temperature control system comprises a combustion chamber, a fuel supplying device, a secondary air supplying device and a control unit. The fuel supplying device is configured and arranged to supply fuel into an intake passage. The secondary air supplying device is configured and arranged to selectively supply secondary air to an exhaust passage. The control unit is configured to execute a secondary air combustion operation in which a valve overlapping period during which an intake valve and an exhaust valve are both open is set and the fuel supplying device is controlled to inject the fuel into the intake passage so that a portion of the fuel that blows by a combustion chamber and into the exhaust passage during the valve overlapping period is combusted by the secondary air supplied by the secondary air supplying device.
摘要:
A variable valve timing control apparatus is provided which comprises an operation angle control mechanism capable of varying an intake operation angle, a phase control mechanism capable of varying an intake maximum lift phase, and a control unit that controls the operation angle control mechanism and the phase control mechanism in accordance with an engine operating condition, wherein the control unit has an engine temperature estimating section that estimates an engine temperature and controls the intake operation angle so that when the engine is operating in an extremely low-load range including idling, the intake operation angle when an engine temperature is extremely low is set larger than that when the engine is cold, the extremely low-engine temperature being lower than the engine temperature when the engine is cold. A method of controlling a variable valve timing of an internal combustion engine is also provided.
摘要:
A control system for an engine comprises an operation range judging section that judges an operation range assumed by the engine, a variable cycle operating section that switches the operation of the engine between 4-cycle operation and a different cycle operation in accordance with a judgment made by the operation range judging section, the different cycle operation being of an operation whose cycle is different from 4-cycle, and an intermediate variable cycle operating section that allows part of the cylinders to carry out 4-cycle operation and remaining part of the cylinders to carry out the different cycle operation when the operation range judging section judges that the engine is under an intermediate operation range assumed between an operation range provided by 4-cycle operation and an operation range provided by the different cycle operation.
摘要:
A control device for an internal combustion engine of a spark-ignition type that injects fuel directly into a combustion chamber including a temperature detector that detects the temperature of the combustion chamber, a load detector that detects the load of the internal combustion engine, and a controller. The controller performs a first control when the temperature of the combustion chamber is lower than or equal to a predetermined temperature and the load of the internal combustion engine is higher than a predetermined load such that the timing of fuel injection is advanced compared with the timing when the load of the internal combustion engine is lower than or equal to the predetermined load.
摘要:
A variable valve control system for an internal combustion engine including a plurality of cylinders, the variable valve control system including a variable lift characteristic control mechanism to adjust a valve lift characteristic of each of intake valves. The variable valve control system is configured to perform determining an engine condition indicator in correlation with an actual relative variation in the valve lift characteristic between the cylinders; determining a desired valve lift characteristic in accordance with an operating condition of the internal combustion engine; controlling the valve lift characteristic of each of the intake valves in accordance with the desired valve lift characteristic; determining the engine condition indicator when the desired valve lift characteristic is equal to a predetermined small valve lift characteristic setting; and expanding the small valve lift characteristic setting if the determined engine condition indicator is larger than a predetermined first threshold value.
摘要:
An intake control apparatus is configured to control a variable valve operating mechanism and an opening degree of a throttle valve. The variable valve operating mechanism varies the valve lift characteristic of the intake valves to control the intake air amount into the cylinders of the engine. The throttle valve produces a negative pressure inside the collector, but in a valve control region including medium loads, the pressure inside the collector is fixed at a weak negative pressure and the intake air amount is controlled by varying the valve lift characteristic of the intake valves. In an internal EGR priority region of low loads, the negative pressure is strengthened somewhat and the lift/duration of the intake valves is increased. When the engine is cold, the negative pressure is adjusted to be close to atmospheric pressure and the lift/duration of the intake valves is reduced.
摘要:
A variable cam engine with an intake valve, including a first cam shaped to allow an increased intake valve lift and an increased intake valve duration, a second cam shaped to allow a reduced intake valve lift and a reduced intake valve duration, a cam switching mechanism for switching between the first and second cams depending on an engine speed and an engine load, and a control unit programmed to substantially equalize amounts of intake air flowing into the engine before and after switching from the first cam to the second cam, and programmed to determine a first ignition timing when the second cam is operated and a second ignition timing when the first cam is operated, and advance the first ignition timing relative to the second ignition timing upon switching from the first cam to the second cam.
摘要:
A variable valve mechanism provided on a exhaust side of an internal combustion engine, in which a most advanced state is set as an initial state, operating condition detecting means for detecting operating conditions, variable valve control means for controlling an operation of the variable valve mechanism in accordance with the operating conditions, engine condition determining means for determining whether the internal combustion engine is in a cold state or a warm state, and stop request determining means for determining whether or not a stop request has been issued in relation to the internal combustion engine are provided. When a stop request is issued in the cold state, the internal combustion engine is stopped after returning the variable valve mechanism to the initial state.