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 for operating at least one supercharger of an internal combustion engine is described, the actuating signal for at least one actuating element of the supercharger (waste gate actuator, electrical auxiliary compressor) being generated as a function of the exhaust gas volume flow in the exhaust tract of the internal combustion engine.

Abstract: A method and an arrangement are suggested for determining a temperature quantity in a mass flow line which includes a throttle position and to which an additional gas mass flow is supplied after the throttle position. The temperature ahead of the throttle position is determined on the basis of the portion of the additional gas mass flow in the total flow in dependence upon the temperature of the mixture of the two gas mass flows as well as the temperature of the introduced gas mass flow.

Abstract: A method and a device for controlling the drive unit of a vehicle are provided, in which, in addition to the selection variable for an output variable of the drive unit, another setpoint variable representing the required dynamic setting of the output variable is preselected. The manipulated variable of the drive unit to be influenced is selected on the basis of the selection variable and the additional setpoint variable.

Abstract: A method for operating an internal combustion engine. The latter has at least one combustion, one induction pipe, and one throttle valve. From the actual position of the throttle valve, 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: 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 a 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: Described are a method, a computer program, and a control unit for operating a vacuum reservoir provided in an internal combustion engine of a motor vehicle for a servo booster or power-assist unit of the internal combustion engine, which is coupled to an intake manifold of the internal combustion engine and to an electrical suction pump. The pressure prevailing in the vacuum reservoir is determined by a computational model in which quantity flows are fed to the vacuum reservoir when at least one servo unit is actuated, quantity flows are removed from the vacuum reservoir when the pressure prevailing in the intake manifold is lower than the pressure prevailing in the vacuum reservoir, i.e., when the electrical suction pump is switched on. The total pressure prevailing in the vacuum reservoir is calculated from the balance of these flow quantities.

Abstract: An internal combustion engine (1), especially of a motor vehicle, is described. The engine (1) is provided with a combustion chamber (4) into which fuel can be injected in a first operating mode during a compression phase and in a second operating mode during an induction phase. The engine (1) is provided with a control apparatus (18) for switching over between the operating modes. The engine (1) includes an exhaust-gas recirculation having an exhaust-gas recirculation valve (14). The engine (1) is switched by the control apparatus (18) into the first operating mode when the exhaust-gas recirculation valve (14) is jammed in the open state.

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: A method and an arrangement for monitoring a pressure sensor are suggested which determines a value representing the ambient pressure of an internal combustion engine. Furthermore, an index for the extent of the correction of the mixture composition via the mixture control system is determined and the supplied air mass is detected from the throttle flap angle and the intake manifold pressure. A fault in the determination of the ambient pressure is detected when the measured air mass deviates from the computed air mass and the correction of the mixture control system is less than a predetermined limit value and when, for an open throttle flap, intake manifold pressure and ambient pressure deviate impermissibly from each other.

Abstract: The invention is directed to a method and an arrangement for controlling an internal combustion engine (1) having a compressor (5) for compressing the air drawn in by suction by the engine (1). The compressor is especially an exhaust-gas turbocharger. With the method and arrangement, a requirement-proper and timely opening of a valve (10) of an air path (15) is ensured for avoiding compressor pumping. The air path (15) bypasses the compressor (5). The valve (10) of the air path (15), which bypasses the compressor (5), is controlled in dependence upon at least one pregiven characteristic line (20, 25) of a compressor characteristic field.

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: 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: The plausibility check takes place in such a way that a first piece of load information is derived as a function of the throttle valve position and a differential pressure determined from the pressure upstream of the throttle valve and the pressure downstream of the throttle valve. In addition, a second piece of load information is derived as a function of the intake valve lift and the engine speed. The smaller of the two pieces of load information is compared with the measured load. If this measured load deviates from the load information an error of the measured load is signaled.

Abstract: A device for determining air entering cylinders of an internal combustion engine having a supercharger. The air is determined as a function of such quantities as rpm, air throughput in the intake manifold, throttle valve position values and temperature, characterized in that at least the following physical relationships are included in the determination: suction equation of the engine balancing equation for a filling in an intake manifold flow rate equation at a throttle valve balancing equation in a volume between the throttle valve and the supercharger.

Abstract: A method and a device for controlling the drive unit of a vehicle are described, wherein in addition to the selection variable for an output variable of the drive unit, another setpoint variable representing the required dynamic setting of the output variable is preselected. The manipulated variable of the drive unit to be influenced is selected on the basis of the selection variable and the additional setpoint variable.

Abstract: A valve flow characteristic line is adapted by weighting the valve position as an input variable using a variable offset value. To calculate a robust model of the intake manifold pressure, a modeled partial pressure of the recirculated exhaust gas is determined so that it differs as little as possible from the actual partial pressure of the recirculated exhaust gas. To do so, a modeled partial pressure of the recirculated exhaust gas is derived from a flow characteristic of a valve in an exhaust gas recirculating line as a function of the valve position. The modeled partial pressure of the recirculated exhaust gas derived from the flow characteristic is corrected adaptively as a function of the difference between the modeled intake manifold pressure and a measured intake manifold pressure.

Abstract: The invention is directed to a method for monitoring the operation of an intake-manifold flap for switching the intake manifold of an internal combustion engine. The engine rpm (nmot) is measured utilizing an rpm sensor and the air mass flow (ms) is measured utilizing an air mass flow sensor. The intake manifold pressure (ps) is computed on the basis of the engine rpm (nmot) and the air mass flow (ms) for at least two different intake-manifold flap positions and, simultaneously, the intake-manifold pressure is measured utilizing a pressure-detecting sensor. The difference between the computed and measured intake-manifold pressures is formed for each one of at least two positions of the manifold flap. A diagnosis is then made of the operation of the intake-manifold flap by evaluating the differences formed.

Abstract: Method and arrangement for operating an internal combustion engine (10) which can be operated in several modes of operation, especially an internal combustion engine (10) having direct injection (DE) or intake manifold injection (SRE) and with a control apparatus (11). The control apparatus (11) or its software has a plurality of functions (12) and a scheduler (13) for activating the functions (12). Operating modes are assigned to the functions (12) and the functions (12) are activated by the scheduler (13) in dependence upon the assigned modes of operation.

Abstract: An internal combustion engine (1), especially of a motor vehicle, is described. The engine (1) is provided with a combustion chamber (4) into which fuel can be injected in a first operating mode during a compression phase and in a second operating mode during an induction phase. The engine (1) is provided with a control apparatus (18) for switching over between the operating modes. The engine (1) includes an exhaust-gas recirculation having an exhaust-gas recirculation valve (14). The engine (1) is switched by the control apparatus (18) into the first operating mode when the exhaust-gas recirculation valve (14) is jammed in the open state.