摘要:
With an internal combustion engine (1) there is the problem that the fuel-air mixture directed into the combustion chamber of the cylinders (2) can be substantially influenced by manufacturing tolerances and ageing of the fuel injectors and uneven distribution is thus created. According to the invention it is therefore proposed that the uneven distribution is individually determined for each cylinder (2) depending on the operating mode of the internal combustion engine (1) (homogenous operation, stratified operation), wherein either the exhaust gas is analyzed and a corresponding emission value is determined there from or that a value is individually determined for each cylinder (2) for the operational roughness of the internal combustion engine (1). These values are compared with a limit value predetermined for the internal combustion engine (1) and upon exceeding of the predetermined limit value a fault entry in a fault memory (9) is made for the cylinder (2) concerned.
摘要:
By a respective cylinder-specific lambda regulator, a regulator value for influencing the air/fuel ratio in the respective cylinder is determined as a function of the cylinder-specific air/fuel ratio measured for the respective cylinder. The regulator value is monitored for the attainment of a first predefined threshold value, and when the latter is reached, a lambda quality value is determined which is representative of the deviation of the measured cylinder-specific air/fuel ratios assigned to the respective cylinders. The regulator value is monitored for the attainment of a second predefined threshold value which is representative of a more pronounced regulating intervention than the first threshold value. When the second predefined threshold value is reached, the lambda quality value is determined. If the lambda quality value assigned to the first threshold value is lower than the value assigned to the second threshold value, unstable regulating behavior is identified. Stable regulating behavior is identified otherwise.
摘要:
In a method for adapting variations in cylinder-selective injection quantities of a direct injection system of an internal combustion engine with a plurality of cylinders, factorial and additive adaptive values are determined in order to be able to reliably adjust a given lambda value for the entire engine even in the event of a multiple injection.
摘要:
An exhaust probe is arranged on an internal combustion engine with multiple cylinders and the injection valves provided for the cylinders measure the fuel. The exhaust probe is arranged on an exhaust manifold, and the measured signal is characteristic of the air/fuel ratio in the corresponding cylinder. The measured signal is recorded at a given crankshaft angle with relation to a reference position for the piston and allocated to the corresponding cylinder. A set parameter for adjustment of the air/fuel ratio in the corresponding cylinder is generated depending on the measured signal recorded for each cylinder. The given crankshaft angle is adjusted depending on a value criterion which depends on a uneven running of an output shaft from the internal combustion engine.
摘要:
The invention relates to a method for diagnosing a regulated exhaust gas catalyst, according to which regulating the catalyst results in control cycles, catalyst diagnosis being performed at a predetermined oxygen concentration per control cycle. A fuel mixture can be adjusted fat or lean according to a specific lambda control factor. A fat or lean exhaust gas is detected, the lambda control factor being incrementally decreased when a lean exhaust gas is detected. The lambda control factor is modified by a P step following a detected change from a fat to lean exhaust gas or from a lean to a fat exhaust gas, the lambda control factor being set to a minimum value during a first loading period following a detected change from a fat exhaust gas to a lean exhaust gas while being set to a maximum value during a second loading period following a detected change from a lean exhaust gas to a fat exhaust gas. The first and the second loading period are adjusted such that the oxygen concentration reaches the predetermined oxygen concentration in each control cycle.
摘要:
The invention relates to a method for diagnosing a regulated exhaust gas catalyst, according to which regulating the catalyst results in control cycles, catalyst diagnosis being performed at a predetermined oxygen concentration per control cycle. A fuel mixture can be adjusted fat or lean according to a specific lambda control factor. A fat or lean exhaust gas is detected, the lambda control factor being incrementally decreased when a lean exhaust gas is detected. The lambda control factor is modified by a P step following a detected change from a fat to lean exhaust gas or from a lean to a fat exhaust gas, the lambda control factor being set to a minimum value during a first loading period following a detected change from a fat exhaust gas to a lean exhaust gas while being set to a maximum value during a second loading period following a detected change from a lean exhaust gas to a fat exhaust gas. The first and the second loading period are adjusted such that the oxygen concentration reaches the predetermined oxygen concentration in each control cycle.
摘要:
An exhaust probe is arranged on an internal combustion engine with multiple cylinders and the injection valves provided for the cylinders measure the fuel. The exhaust probe is arranged on an exhaust manifold, and the measured signal is characteristic of the air/fuel ratio in the corresponding cylinder. The measured signal is recorded at a given crankshaft angle with relation to a reference position for the piston and allocated to the corresponding cylinder. A set parameter for adjustment of the air/fuel ratio in the corresponding cylinder is generated depending on the measured signal recorded for each cylinder. The given crankshaft angle is adjusted depending on a value criterion which depends on a uneven running of an output shaft from the internal combustion engine.
摘要:
In a method for adapting variations in cylinder-selective injection quantities of a direct injection system of an internal combustion engine with a plurality of cylinders, factorial and additive adaptive values are determined in order to be able to reliably adjust a given lambda value for the entire engine even in the event of a multiple injection.
摘要:
Injectors each having a piezo actuator are assigned to cylinders of an internal combustion engine. A regulator device is configured for furnishing a cylinder-specific controlled variable and a command variable to a controller whose primary manipulated variable is a variable representing an electrical power supplied to the piezo actuator during a control cycle. A manipulated variable splitting unit is provided whose input variable is a regulator-determined regulator value of the primary manipulated variable and is configured for determining a total value of the primary manipulated variable according to the regulator value. It is also configured for splitting the total value into a primary value of the primary manipulated variable and into a secondary value of a secondary manipulated variable according to a lower and/or upper threshold value of the total value.
摘要:
The invention relates to a method for the cylinder-selective control of an air/fuel mixture to be burnt in a multi-cylinder internal combustion engine, in which the lambda values for different cylinders or groups of cylinders are separately sensed and controlled, and also relates to a multi-cylinder internal engine suitable for carrying out the method. In accordance with the invention, the lambda values of the individual cylinders or groups of cylinders are simultaneously controlled to different required values using an integrating I-control proportion with variable integrator slope and/or a differentiating D-control proportion.