Abstract:
Die Erfindung betrifft ein Verfahren zum Betrieb einer Kolbenbrennkraftmaschine mit elektromagnetischen Ventiltrieben zur Betätigung der Gaswechselventile, die jeweils einen zwischen zwei Elektromagneten gegen die Kraft von Rückstellfedern bewegbare und mit einem Gaswechselventil in Verbindung stehenden Anker aufweisen und, die über eine elektronische Motorsteuerung vollvariabel ansteuerbar sind, das dadurch gekennzeichnet ist, daß in der Motorsteuerung im Betrieb die Funktion der elektromagnetischen Ventiltriebe eines jeden Zylinders erfaßt wird und daß beim Erkennen eines Funktionsausfalls eines elektromagnetischen Ventiltriebs an einem Zylinder der Elektromagnet des ausgefallenen elektromagnetischen Ventiltriebs mit einem Fangstrom beaufschlagt wird, der den Anker in die Endstellung an einem Elektromagneten bringt, und daß aus dieser Endstellung heraus der elektromagnetische Ventiltrieb für den laufenden Arbeitstakt des Zylinders angesteuert wird.
Abstract:
An intake air control system is arranged in an engine. The engine has an air intake passage, a throttle valve installed in the air intake passage and an intake valve for selectively opening and closing a communication between the intake passage and a cylinder. The control system comprises a target intake passage pressure setting unit which sets a target pressure in an intake passage of the engine in accordance with an operating condition of the engine; a target intake air amount setting unit which sets a target intake air amount of the engine in accordance with the operating condition of the engine; a target throttle open degree setting unit which sets a target open degree of the throttle valve of the engine in accordance with both the target pressure in the intake passage and the target intake air amount of the engine; a throttle valve drive unit which drives the throttle valve in accordance with the target open degree of the throttle valve; an intake passage pressure detecting unit which detects an existing pressure in the intake passage; a target intake valve OPEN/CLOSE timing setting unit which sets a target OPEN/CLOSE timing of the intake valve in accordance with both the detected existing pressure in the intake passage and the target intake air amount; and an intake valve drive unit which drives the intake valve in accordance with the target OPEN/CLOSE timing of the intake valve.
Abstract:
In order to monitor an unwanted elongation of an endless driving belt (6) of an internal combustion engine (1), the time duration (tDcorr) of a fuel injection is determined depending on the phase position of a shaft (5) relative to a crankshaft (8), so that a desired nominal fuel amount is injected even if the shafts (5, 8) are twisted relative to one another.
Abstract:
In an internal combustion engine control system for controlling an internal combustion engine, comprising a fuel injection control means for controlling fuel injection quantity to be injected by a fuel supply system for supplying fuel to the internal combustion engine, and fuel injection timing, and a variable valve control means for continuously or gradually varying at least opening timing, closing timing or lift of a intake valve or an exhaust valve for sealing up a combustion chamber of the internal combustion engine, the fuel injection control means controls at least fuel injection quantity or fuel injection timing on the basis of a value of a controlled variable provided by the variable valve control means. Since air quantity can be regulated by a variable valve timing mechanism, pumping loss and fuel consumption can be reduced. Fuel injected into the combustion chamber can be atomized by opening the intake valve so that a shock wave is generated in the combustion chamber and, consequently, stable combustion can be achieved without deteriorating the quality of the exhaust gas.
Abstract:
An improved apparatus is provided to control supply of airflow to an engine (1). The engine (1) includes a combustion chamber (4) connected to an air intake passage (6) and an air exhaust passage (7). An air intake valve (8) selectively opens and closes the intake passage (6) to control the supply of the airflow to the combustion chamber (4). An air exhaust valve (9) selectively opens and closes the exhaust passage (7) to control the discharge of the exhaust gas from the combustion chamber (4). An altering device alters a period of an overlap of the valves by changing a valve timing of valves. A first detector detects a driving state of the engine (1). An ECU (80) computes a target valve timing based on the detected driving state of the engine (1) controls the altering device (25) based on the computed target valve timing. An adjusting device (23,24) is arranged in the intake passage to adjust the supply of the airflow to the combustion chamber (4). The ECU (80) computes a target amount of the airflow to be supplied to the engine (1) in an idling state. The ECU (80) detects the period of the valve overlap. The ECU (80) computes a correction value to correct the target amount of the air based on the detected period of the valve overlap. The correction value is continuously variable based on the period of the valve overlap. The ECU (80) corrects the target amount based on the correction value by increasing the target amount by the correction value and controls the adjusting device (23,24) based on the corrected target amount.
Abstract:
Die Erfindung betrifft ein Verfahren und eine Vorrichtung zur Überwachung der Stellung einer variablen Ventilsteuerung. Um eine Überwachung der Stellung einer variablen Ventilsteuerung zu schaffen, bei der der bauliche Aufwand vermindert ist, wird vorgeschlagen, eine zylinderspezifische Analyse der Drehungleichförmigkeit der Kurbelwelle durchzuführen und hieraus den Betriebszustand der Ventilsteuerung, ggf. für jeden einzelnen Zylinder, zu bestimmen.
Abstract:
Autocalibration of the camshaft phasing sensor of a closed-loop variable valve timing system of an internal combustion engine. The camshaft phasing adjustment mechanism comprises a cam that changes the camshaft phasing. This cam is provided with a dwell that occurs at a known true phasing of the camshaft. The cam is commanded to operate to the dwell, and the lack of change in the sensor output indicates when the dwell is reached. At this time the sensor output should exactly indicate the known camshaft phasing that is produced by the adjustment cam dwell. If it does not, the difference is calculated and forms an offset that is algebraically applied to the sensor output thereby calibrating the sensor.
Abstract:
A valve actuator to open and close the intake and exhaust valves of an engine utilizing the electromagnetic force generated by an electromagnet. A reciprocally moving magnetic pole (6) is coupled to an intake or exhaust valve (9), an upper fixed magnetic pole (3a) is provided to be opposed to an end in the reciprocating direction of the moving magnetic pole (6), an intermediate fixed magnetic pole (3b) is provided to be opposed to one end of the moving magnetic pole (6) and to the upper fixed magnetic pole (3a), and a first tip-fixed magnetic pole (3c) is provided to be opposed to the other end of the moving magnetic pole (6). The intake or exhaust valve (9) is opened by the repelling force that acts between the upper fixed magnetic pole (3a) and one end of the moving magnetic pole (6). Being contiguous to the upper fixed magnetic pole (3a), furthermore, a second tip-fixed magnetic pole (3d) is provided to be opposed to the other end of the moving magnetic pole (6), and the intake or exhaust valve (9) is closed by the attracting force acting between the upper fixed magnetic pole (3a) and one end of the moving magnetic pole (6) that results from the magnetic flux passing through the second tip-fixed magnetic pole (3d). By changing the times for exciting the magnetic poles, therefore, the timings can be controlled to open and close the intake or exhaust valve (9).