摘要:
Valve timing control apparatus for engine includes a cam phase actuator (1113) composed of a first rotor (1) rotatable with a crank shaft, a second rotor (6) mounted on a cam shaft (7) and a lock mechanism (15, 16, 18) for locking the second rotor to the first rotor, a pump (1118) for generating a hydraulic pressure, an ECU for computing a current value corresponding to a pressure for clearing a locked state at the first relative angle for shifting the first relative angle to a second angle, and an OCV (1114) for supplying a pressure for regulating a cam phase of the second rotor in dependence on the current value. The ECU computes a first current value for generating a first pressure for releasing the locked state. The first current value is supplied to the OCV for a predetermined time before shifting the first relative angle.
摘要:
A valve timing control apparatus for internal combustion engines, capable of obtaining a stable responsibility, and correcting a scatter of the characteristics of the apparatus and the variation thereof occurring with the lapse of time is provided. A valve timing control apparatus is provided with a valve opening and closing cam adapted to be driven by a crankshaft of an internal combustion engine, a valve timing varying means adapted to vary a rotational phase between the (cam and crankshaft, a detector adapted to detect an acting position of the valve timing varying means, and a control means adapted to output a control variable with respect to the valve timing varying means, the control means storing normative characteristics of the valve timing varying means, computing a target valve timing position, comparing a valve timing position detected by the acting position detector and a valve timing position of the normative characteristics with each other with respect to a target valve timing position, and determining a control variable with respect to the valve timing varying means on the basis of the results of the comparison.
摘要:
An internal-combustion engine control system is able to suppress the occurrence of problems such as changes in air-fuel ratio. The internal-combustion engine control system is equipped with intake pressure detecting means for detecting intake pressure in the internal-combustion engine; operating state detecting means for detecting the operating state of the internal-combustion engine; and controlling means for controlling the operation of the internal-combustion engine according to the operating state of the internal-combustion engine; wherein the controlling means corrects the amount of the fuel injection according to a differential pressure between the intake pressure in a steady operation mode of the internal-combustion engine and an intake pressure detected by the intake pressure detecting means.
摘要:
In an exhaust gas purification system for an internal combustion engine including a catalytic converter disposed in an exhaust pipe, an apparatus for controlling an amount and temperature of fresh air fed into the exhaust pipe so that optimal purification efficiency of the catalytic converter can realized. The apparatus includes an air pump for taking in fresh air, a control valve for controlling air flow, a heater for heating the air and the controller for controlling the pump, the valve and the hater in dependence on engine operation states so that nitrogen oxides, carbon monoxide and hydrocarbon contained in the exhaust gas can be removed to a maximum through reduction and oxidation reactions. An abnormality detecting device detects occurrence of abnormality in the air feeding control apparatus for ensuring fail-safe operation thereof.
摘要:
A fuel supply control system for an automotive engine determines a property of the fuel, such as the fifty percent distillation temperature T.sub.50 thereof, and the fuel injectors of the engine are controlled in accordance with the determined fuel property. When the engine is idling and the coolant water temperature WT of the engine is decreasing, the amplitude X of the feedback correction factor K.sub.2 for proportional-plus-integral control action is measured a number of times, and an average amplitude X.sub.0 thereof is calculated. The property of said fuel is determined on the basis of the thus calculated average amplitude X.sub.0 and the coolant water temperature WT using a two-dimensional map which gives the value of T.sub.50 as a function of the amplitude X of the feedback correction factor K.sub.2 and the coolant water temperature WT. The thus determined index T.sub.50 is stored in a RAM backed up by a battery. When a new fuel is supplied to the fuel tank, the value of index T.sub.50 is cleared to determine the index afresh.
摘要:
A casing assembly for electronic equipment comprising a printed circuit board on which an exothermic electronic component is mounted, a casing for covering the printed board, and a base for attaching the casing to a wall body or a rail. The base is of a high heat conductive material and has a planar structure which results in a large contact area between it and the wall body or rail. A high heat conductive plate like cushioning member made of an electrically insulative material is interposed between the board and the base in contact therewith. The heat generated in the electronic component is released through the printed board and lead wires and through the cushioning member and the base to the wall body or rail. Preferably, where the casing is attached to the rail, a guide latch member and a pressure latch member are attached to the base. Where an auxiliary printed board is provided in addition to the printed board, the base, the printed board, the auxiliary frame and the auxiliary printed board are stacked in that order and covered with the casing. Where a programmer is attached to the casing, provision is made for attaching in either the horizontal or vertical direction. Where the functions of a basic module is insufficient, extended modules may be connected.
摘要:
Provided is a control device for an internal combustion engine, including a crank angle sensor, a cam angle sensor, a real phase angle detector for detecting a real phase angle of a cam shaft based on a detection signal of the sensors, a target phase angle setting unit including a temperature parameter and battery voltage, for setting a target phase angle of the cam shaft based on an operating state of the internal combustion engine, and a phase angle feedback control unit for conducting feedback control operation so that the real phase angle coincides with the target phase angle, and for calculating an operation quantity to a hydraulically controlled solenoid valve, in which the feedback control unit sets an integral term initial value when starting the feedback control operation according to the temperature parameter, corrects a control correction quantity by the battery voltage, and outputs the operation quantity to the solenoid valve.
摘要:
To prevent RPM decrease, misfire, and engine stall by refraining from correcting, the amount of fuel to shift an air-fuel ratio toward a lean side to the extent of exceeding a combustion limit when the internal combustion engine operates at a low load, a control apparatus is provided for controlling operation of an internal combustion engine. The apparatus includes: air-fuel ratio state determining means; characteristic retaining means; and fuel correction amount calculating means, in which a coolant temperature coefficient of a coolant temperature coefficient characteristic is set to be smaller than a constant value in a region where a coolant temperature is lower than a constant temperature.
摘要:
The valve timing control system of the present invention comprises an actuator for changing an actual valve timing of an intake valve or an exhaust valve; an oil pressure adjusting unit for supplying operating oil to the actuator, and adjusting the oil pressure thereof; an actual valve timing control unit for controlling the actuator by controlling the oil pressure adjusting unit, so that the actual valve timing follows up a target value; and an oil temperature estimation unit for estimating the temperature of the operating oil, according to an operating state of the internal combustion engine from a previous operation, and according to its current operating state. Based on the estimated oil temperature, the actual valve timing control unit switches a control amount for controlling the oil pressure adjusting unit.
摘要:
A valve timing control system for an internal combustion engine for preventing hitching of a lock pin of an actuator at the time of changing a cam angle is provided. The valve timing control system is provided with actuators 15 and 16 connected to cam shafts 15C and 16C, hydraulic pressure supply units 19 and 20 for driving the actuators, and a controller 21A for controlling a hydraulic pressure for the actuators in dependence on engine operation states while changing a relative phase of the cam shafts relative to crank shafts. The actuator includes a locking mechanism for setting the relative phase to a lock-up position, and an unlocking mechanism for releasing the locking mechanism in response to a predetermined hydraulic pressure. The controller executes a releasing operation of the locking mechanism if the lock-up position in the locking mechanism changes from inside a predetermined range to outside the predetermined range.