Siemens Aktiengesellschaft

Dirk Heinitz

Achim Przymusinski

Andreas Hartke

Christian Birkner

Martin Hecker

Arno Friedrich

Benno Larisch

A method for the closed-loop control of a nonlinear controlled system in which a state variable of the controlled system is determined and an actuating value is determined using a control method and a reference variable. In addition, by using the state variable of the controlled system, a correction value is read from a linearization characteristic curve and multiplied by the actuating value and the product is specified as new desired value for the controlled system. The linearization characteristic curve is chosen in such a way that multiplication of the linearization characteristic curve by the nonlinear control action of the controlled system yields a linear control action.

Method for the closed-loop control of a controlled system, in particular of an internal combustion engine

A method of starting an internal combustion engine having an injection system and characteristic variables includes the steps of supplying an injection system with an operating parameter that is determined from characteristic variables, supplying a speed regulator with an initialization value as an initial starting variable, and regulating a speed of an internal combustion engine up to an idling speed with the speed regulator based upon the initialization value. The acceleration to idling speed is carried out with the aid of the speed regulator based on the initialization value. The injection system is supplied with a mass of fuel to be injected. Regulation is carried out with a speed regulator already present in an engine controller. The initialization value is stored in a characteristic curve as a function of coolant temperature. The initialization value is applied to a first injection operation of the internal combustion engine.

Method for determining an operating parameter for starting an internal combustion engine

A method of controlling the exhaust gas recirculation in an internal combustion engine. The operation is improved in the non-steady operating state of the engine by correcting the setpoint value of the exhaust gas recirculation rate for the non-steady operating state.

Method of controlling exhaust gas recirculation in an internal

A device for regulating a pressure in a high pressure accumulator of a fuel injection system includes a pressure adjusting element which has a shut-off element and an electromagnetic drive actuating the shut-off element. A first regulating device is connected to the pressure adjusting element and compares a pressure value obtained in the high pressure accumulator with a given setpoint pressure value. A drive signal with a setpoint current value for the electromagnetic drive is determined as a function of the comparison. A second regulating device is connected downstream of the first regulating device for comparing a current value of a current flowing through the electromagnetic drive with the setpoint current value and readjusting the current value in response to a deviation between the current value and the setpoint current value. A method for regulating a pressure in a high pressure accumulator is also provided.

Device and method for regulating a pressure in accumulator injection

A method for controlling an injection of fuel in an internal combustion engine in which steady-state optimum injection parameters, in particular the start-of-injection angle, is corrected for non-steady-state operating phases. The correction is carried out by a transmission element to which the driver's request is fed as an input and correction parameters are determined therefrom. Using the correction parameters, fuel injection parameters obtained from a characteristic diagram that is optimum for steady-state operating conditions are corrected. In this manner, the behavior of the internal combustion engine is improved for non-steady-state operating phases.

Method for controlling the fuel injection in an internal combustion

A method for regulating the smooth running of a multicylinder internal combustion engine. An inverse linear path model estimates a characteristic process variable from state variables of the internal combustion engine, that is to say actual values, in particular engine speed, fuel quantity, operating temperature, charging pressure, etc. A desired value is compared with the actual value that is determined from state variables of the internal combustion engine by a measuring element. The actual value shows the rotational acceleration contribution of each cylinder. The difference between the actual value and the desired value is supplied to a controller that corrects the combustion in the individual cylinders in such a way that the actual value approaches the desired value. This ensures that the regulation for the smooth running of the engine takes effect both for stationary and non-stationary operating phases of the internal combustion engine.

Method for regulating a smooth running of an internal combustion engine

The boost pressure in a turbocharged internal combustion engine is regulated by closed-loop control. A current performance graph value u(k), corresponding to a desired boost pressure, is determined from a speed/load-dependent performance graph. After that, the current performance graph value u(k) is compared with a previous performance graph value u(k-1). If the current performance graph value u(k) is greater than or equal to the previous performance graph value u(k-1), then the current performance graph value u(k) is transmitted as the process parameter x(k). Conversely, if the current performance graph value u(k) is less than the previous performance graph value u(k-1), then the current performance graph value u(k) is filtered by a PT.sub.2 member after an idle time elapses and is transmitted as the process parameter x(k).

Method for the closed-loop control of the boost pressure of a

An internal combustion engine has a pressure sensor for a charging pressure, an air mass flow rate meter for an air mass flow and a charging device with which a bypass valve in a bypass pipe or an actuator for varying the geometry of a turbine are associated. A cascaded control device for controlling the internal combustion engine includes a first controller having a controlled variable that is the charging pressure and a manipulated variable which is the air mass flow, as well as a second controller having a controlled variable that is the air mass flow and a manipulated variable which is the degree of opening of the bypass valve.

Device for controlling an internal combustion engine

A transmission system includes an internal combustion engine, a vehicle drive train and a fuel supply. A method for controlling the internal combustion engine for preventing low frequency bouncing oscillations includes connecting a transmission element upstream of the transmission system. The transmission element has a transmission function inverse with respect to a transmission function of the transmission system. A selection of a time constant of the transmission element not only prevents the bouncing oscillations but also achieves a damping of load jolts.

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Schonhofen, Germany

Dirk Heinitz