Abstract: A method and system for ensuring reliable operation of a brake booster system for a vehicle braking system in which a pressure value prevailing in the brake pressure reservoir of the brake booster system is sensed by a pressure sensor. An error occurring in the brake booster system is detected by evaluating the sensed pressure value prevailing in the brake pressure reservoir as a function of the actuation of the brake actuating mechanism. The brake booster system includes a diagnostic circuit that is connected to the pressure sensor and to the brake actuating mechanism.

Abstract: A method and a device are proposed for diagnosing flow resistance in the intake tract of internal combustion engines, which permit ascertaining the flow resistance in the intake tract with sufficient accuracy, using only one pressure sensor, in order, for example, to be able to diagnose a fouled air filter. This is done by measuring the suction pipe pressure in unthrottled operation at low and at higher air mass flow, and the flow resistance in the intake tract is inferred from the pressure difference.

Abstract: Described are a method, a computer program, and a control unit for operating a vacuum reservoir (6) provided in an internal combustion engine of a motor vehicle for a servo booster or power-assist unit (8, 10, 11) of the internal combustion engine, which is coupled to an intake manifold (1) of the internal combustion engine and to an electrical suction pump (30). The pressure prevailing in the vacuum reservoir (6) is determined by a computational model in which quantity flows are fed to the vacuum reservoir (6) when at least one servo unit (8, 10, 11) is actuated, quantity flows are removed from the vacuum reservoir (6) when the pressure prevailing in the intake manifold (1) is lower than the pressure prevailing in the vacuum reservoir (6), i.e., when the electrical suction pump (30) is switched on. The total pressure prevailing in the vacuum reservoir (6) is calculated from the balance of these flow quantities.

Abstract: A vacuum chamber (22) of a pneumatically operated servo unit (30) of a motor vehicle is subjected to vacuum by an electric suction pump (28). In order to monitor the vacuum chamber (22) and the electric suction pump (28), the invention proposes that a starting pressure in the vacuum chamber (22) be determined. In addition, after a certain time interval, an ending pressure in the vacuum chamber (22) is determined. Furthermore, the difference between the ending pressure and the starting pressure is calculated and compared to a limit value. If this difference falls below the limit value, a signal is generated, in particular a warning and/or alarm signal.

Abstract: A method and a device are proposed for controlling and/or diagnosing a control system influencing a mass flow. In this context, a correction value is calculated, which corrects the controlling, or is evaluated for diagnostic purposes. The correction value, in this context, is derived from the line resistance of the mass flow line.

Abstract: An internal combustion engine, especially for a motor vehicle, is described which is provided with a combustion chamber into which fuel can be injected in at least two operating modes. A control apparatus is provided with which a switchover can be made between the operating modes in dependence upon a desired operating mode. With the control apparatus, an operating-mode request can be determined in dependence upon whether the individual operating modes are in the position to generate the requested torque while maintaining pregiven lambda limits.

Abstract: The goal is to reliably diagnose and compensate for a change in the gas flow passing through an exhaust gas recirculation line. For this purpose, according to a first method, the mass flow passing through the exhaust gas recirculation line is derived as a function of the position and the flow characteristic of the exhaust gas recirculation valve, and, according to a second method, the mass flow is derived from the fresh-air mass flow in the induction pipe and from the induction pipe pressure. Then the difference is determined between the mass flows as ascertained in accordance with the two methods, and from the difference one or plurality of correcting quantities is generated for the mass flow that is derived as a function of the valve position and of the flow characteristic.

Abstract: A method for operating an internal combustion engine. The latter has at least one combustion chamber, one induction pipe, and one throttle value. From the actual position of the throttle value, a gas charge of the combustion chamber is defined. To improve the emissions and fuel consumption characteristics of the internal combustion engine, the minimum gas pressure is measured that exists in the induction pipe assigned to the combustion chamber at the end of the intake stroke. From this gas pressure, a value is determined which more closely approximates the actual gas charge of the combustion chamber.

Abstract: A method and a device for controlling a gas flow over a throttle valve in an internal combustion engine. The method and device can be used in particular in internal combustion engines in motor vehicles and allow for fast and accurate control of a gas flow while minimizing apparatus and control costs. A method is provided for controlling a gas flow over a throttle valve in a combustion over the throttle valve and the actual gas flow; and taking into account the determined difference when calculating the throttle setting.

Abstract: An internal combustion engine especially for a motor vehicle is described which is provided with a combustion chamber into which fuel can be injected in at least two operating modes. A control apparatus is provided with which a switchover can be made between the operating modes in dependence upon a desired operating mode. The desired operating mode can be determined from a plurality of operating mode requests by the control apparatus.

Abstract: The invention is directed to an internal combustion engine, especially for a motor vehicle. The engine has a combustion chamber into which fuel can be injected in at least two operating modes. A control apparatus is provided with which a switchover between the operating modes can be effected. A desired value (rlmd$s) can be determined with the control apparatus for the air charge in the combustion chamber. The desired value (rlmd$s) defines a maximum value for the air charge in the combustion chamber which is not exceeded.

Abstract: Controlling an internal combustion engine which has an additional component provided in its exhaust gas conduit including a turbine and turbo of a turbo charger, includes enriching a mixture at a high throughput, determining a main filling signal by a main filling signal sensor and a substitute filling signal by a substitute filling sensor, converting the substitute filling signal into a control signal for at least one value selected from the group consisting of an air supply, a fuel supply and an ignition time point, such that the substitute filling signal is greater than the main filling signal by at least one protective factor, and selecting the protective factor so that at high throughput a change of the mixture toward a fattening is performed.

Abstract: The invention relates to a method and an arrangement for operating an internal combustion engine wherein at least one control quantity of the engine is influenced in dependence upon a signal representing the fresh air charge. The throttle flap angle and the intake manifold pressure are determined and a respective signal is formed on the basis of the throttle flap angle and on the basis of the intake manifold pressure. The charge signal, which is formed on the basis of the throttle flap angle, is adapted to the signal, which is formed on the basis of the intake manifold pressure sensor, with the aid of at least one corrective factor.

Abstract: A method for determining a gas charge of an internal combustion engine having an intake manifold. The intake manifold has a gas mixture, which is a fresh air/fuel mixture and an exhaust gas, and further has a gas mass flow from the intake manifold and an intake manifold pressure. The method includes the steps of determining a partial pressure of the fresh air/fuel mixture in the gas mass flow by setting up a mass balance for a fresh air/fuel mixture mass flow, determining a partial pressure of the exhaust gas in the gas mass flow by setting up a mass balance for an exhaust gas mass flow, and determining a gas mass flow via a throttle based on a function that depends on a temperature compensation factor, a pressure compensation factor and a factor depending on a ratio of a pressure downstream of the throttle to a pressure upstream of the throttle. The pressure downstream of the throttle corresponds to the intake manifold pressure.

Abstract: A method of operating an internal combustion engine of a motor vehicle provided with a vacuum accumulator which provides an auxiliary energy required for at least one servo function of the internal combustion engine in form of a vacuum and which is acted upon by a vacuum acting in a suction pipe of the internal combustion engine. The method computes a pressure acting in the vacuum accumulator, supplies mass flows to the vacuum accumulator when at least one servo function is performed, and withdraws the mass flows from the vacuum accumulator when a pressure acting in the suction pipe is smaller than the pressure acting in the vacuum accumulator. The pressure acting in the vacuum accumulator is computed from a mass balance of the mass flows supplied to the vacuum accumulator and withdrawn from the vacuum accumulator.

Abstract: The pressure in an underpressure store of a pneumatically operated servo system is controlled by a method wherein the underpressure store is charged with an underpressure via suction line. A higher desired pressure for the underpressure store is pregiven in a rest state of the servo system wherein the system is not actuated and no actuation is expected. A lower desired pressure for the underpressure store is preset in a state wherein the servo system is actuated or an actuation is expected.

Abstract: The device for detecting an erroneous signal characteristic of a load on an internal combustion engine that includes first and second differentiators (10,16) with delay devices that generate corresponding output signals (S11, S22) from respective load signals (S1,S2); first and second magnitude-forming devices (14,17) connected with the first and second differentiators respectively to generate respective magnitude signals from the corresponding output signals (S11,S22) first and second low-pass filters (15, 18) connected with the first and second magnitude-forming devices respectively to generate first and second DC voltage signals (MW1,MW2); a subtracting device (19) for subtracting the first and second DC voltage signals (MW1,MW2) from each other to generate a difference signal (D); and comparison devices (20,23) for generating a first error signal or a second error signal when the difference signal (D) is greater than a predetermined threshold (SW1) or less than a negative of the predetermined threshold (&

Abstract: The method of operating an internal combustion engine, especially of a motor vehicle, having a combustion chamber (4), which is operable in a plurality of combustion cycles, includes feeding an air mass (42) and a fuel mass (3) into the combustion chamber (4) in each combustion cycle; adjusting a mixture composition lambda (&lgr;) of the air mass to the fuel mass for one of the combustion cycles so that &lgr;>1; determining a residual air portion present in the combustion chamber (4) due to combustion occurring in the combustion chamber in the combustion cycle in which the mixture composition lambda (&lgr;) is greater than one; and reducing the air mass to be supplied to the combustion chamber (4) in another combustion cycle following the one combustion cycle in which &lgr;>1 by about the residual air portion found in the one combustion cycle.

Abstract: A method and a device for controlling an internal combustion engine as a function of performance characteristics such as load, engine speed, a corrected value for the intake air temperature being used for the control, the corrected value being obtained from the following formula: TANSK=T1+(TWS−T1)*f where TANSK=corrected value of the intake air temperature, T1=value (TANS) of the intake air temperature remote from the internal combustion engine determined by calculation or measured, TWS=value of the mean temperature of the intake manifold, f=weighting factor ranging from 0 to 1.

Abstract: The method for controlling operation of a vehicle having at least two possible operating modes includes calculating and/or determining the operating variables and/or control variables of at least one active one of at least two possible operating modes in a first continually repeated predetermined time interval and calculating and/or determining the operating variables and/or control variables of at least one inactive one of the at least two possible operating modes in at least one other continually repeated predetermined time interval. The first predetermined time interval is shorter than any of the one or more other predetermined time interval(s). A device for performing the method is also described.