摘要:
The invention relates to an internal combustion engine comprising a camshaft that acts on gas exchange valves, and a phase displacement device by which means a phase (PH) between the camshaft and a crankshaft can be displaced. Said internal combustion engine also comprises an exhaust gas probe which is used to detect a variable characterising an air/fuel ratio in the cylinder, at least one sensor for detecting the phase (PH), and at least one regulating element which acts on the internal combustion engine. Measuring data records (MDS) associated with the different detected phases (PH) are determined, and comprise, in addition to the detected phase (PH), at least the detected variable characterising the air/fuel ratio in the cylinder. An optimisation method (OPT) is carried out, enabling a correction value to be determined for the detected phase (PH) according to the measuring data records (MDS), such that a quality function (GF) that depends on the variables associated with the measuring data records (MDS) is minimised or maximised. During the subsequent operation of the internal combustion engine, at least one regulating variable for controlling a regulating element is determined according to a detected phase (PH) corrected by means of at least one correction value (dPH). A defect in the internal combustion engine is diagnosed according to the correction value (dPH) for the detected phase (PH).
摘要:
An internal combustion engine comprises an intake tract in which a throttle valve is disposed. The engine also comprises a camshaft which acts on gas inlet valves associated with respective cylinders. A phase-adjustment device is used to adjust a phase between the camshaft and a crankshaft. A desired air mass flow (MAF) in a combustion chamber of the cylinder is determined depending on a charge requirement requested by the driver. The desired air mass flow (MAF) is adjusted by varying the phase (PH) between the camshaft and the crankshaft if the desired air mass flow (MAF) can be adjusted by varying the phase (PH) while substantially maintaining an actual pressure difference upstream and downstream of the throttle valve. Otherwise, the desired air mass flow (MAF) is adjusted by varying the opening angle (THR) of the throttle valve.
摘要:
In order to control an internal combustion engine, a fuel mass that is to be supplied to the respective cylinder is determined according to a load variable. An additional fuel mass (MFF_ADD) to be measured once is determined, when the measuring signal (MS) of an oxygen probe arranged downstream from a three-way catalytic converter is characteristic of at least one pre-determined residual oxygen part, according to the course of the measuring signal (MS). A once reduced fuel mass (MFF_RED) is determined, when the measuring signal (MS) is characteristic of at least one pre-determined residual fuel part, according to the course of the measuring signal (MS). A corrected fuel mass to be measured is determined according to the fuel mass to be supplied and optionally less the once reduced fuel mass (MFF_RED) or the fuel mass (MFF_ADD) to be measured once. An actuating signal for controlling the injection valve is generated according to the corrected fuel mass to be supplied.
摘要:
The invention relates to a method for monitoring a control unit of an internal combustion engine, according to which a variable, which characterises the initial parameter of a lambda regulation system, is monitored for a deviation from a predefined threshold value. An error response takes place in accordance with the deviation that has been determined.
摘要:
The invention relates to a method for diagnosing the actuation of a swirl control valve (1), which is positioned downstream of a butterfly valve (8) in the induction section of an internal combustion engine (10). According to said method, the swirl control valve is actuated around a defined regulation path within a supercritical operating range of the induction manifold pressure in the induction section, downstream of the butterfly valve, and if a sudden change in pressure, which is dependent on the regulation path, does not occur in the induction section downstream of the butterfly valve, a defect in the actuation of the swirl control valve is diagnosed.
摘要:
The invention relates an internal combustion engine comprising a camshaft, whereby the phase thereof can be adjusted in relation to the crankshaft by means of an adjusting device. The invention also comprises a camshaft sensor which detects the angle of the camshaft (CRK) and a crankshaft sensor which detects the angle of the crankshaft (CAM). Said method comprises the following steps: A reference value (PH AD) of the phase is adapted in a predetermined position of the adjusting device when a predetermined condition is fulfilled. A measuring value (PH S) of the phase is determined according to the detected angle of the crankshaft (CRK) and the angle of the camshaft (CAM). A corrected measuring value of the phase is determined according to the reference value (PH AD) and the measuring value (PH S) of the phase. An actuator signal for controlling the internal combustion engine is determined according to the corrected measuring value.
摘要:
The invention relates to a method for monitoring a control unit of an internal combustion engine, according to which a variable, which characterises the initial parameter of a lambda regulation system, is monitored for a deviation from a predefined threshold value. An error response takes place in accordance with the deviation that has been determined.
摘要:
The invention relates to a device for determining the quality of fuel for an internal combustion engine, comprising a pressure sensor (1) for determining the pressure (p) inside a fuel tank and/or comprising a temperature sensor (4) for determining the temperature (T) inside a fuel tank. According to the invention, an evaluation unit (5) is provided for determining a quality value (Q), which depicts the quality of the fuel, based on the temperature (T) and/or the pressure (p) inside the fuel tank. Said evaluation unit is connected on the input side to the pressure sensor (1) and/or to the temperature sensor (4).
摘要:
The invention relates to a method for controlling an internal combustion engine with a fuel injection system which can comprise, in addition to a main injection quantity, an additional amount of pre-injected and/or post-injected fuel for each injection pulse for each combustion chamber for each combustion cycle at a given injection time. A theoretical torque is determined from an accelerator pedal value, rotational speed and air or fuel mass flow while taking into account a factor from a family of characteristics. According to the invention, the calculated theoretical torque is corrected in the case of a pre-injected or post-injected fuel mass flow by taking into account, in a correction factor, a value for a time or phase difference of the amount of pre-injected or post-injected fuel and the main injection quantity for each cycle.