A method for regulating a fuel delivery system of an internal combustion engine in a motor vehicle having a fuel delivery pump for supplying the internal combustion engine with fuel, the fuel delivery pump having a pump mechanism driveable by an electric motor actuable by a control signal, and a pressure-sensor-free pressure monitor being provided in the fuel delivery system, includes: predefining a target rotational speed for the electric motor based on the control signal; predefining an upper rotational speed limit and/or a lower rotational speed limit for the target rotational speed, wherein the upper rotational speed limit depends on the maximum fuel requirement of the internal combustion engine, and the lower rotational speed limit depends on the minimum fuel requirement of the internal combustion engine; and determining the target rotational speed by a pressure-sensor-free calculation method.

A control device for an internal combustion engine is configured to: calculate a target intake air amount and a target charging efficiency based on a target torque; control an opening degree of a throttle valve (6) based on the target intake air amount; calculate a target supercharger downstream pressure based on the target charging efficiency; detect a pressure on an upstream side of a supercharger; calculate a target compressor driving force based on the target intake air amount, the target supercharger downstream pressure, and the supercharger upstream pressure; and calculate a target bypass valve opening degree based on the target compressor driving force, to thereby control an opening degree of a bypass valve (12) provided to a bypass passage for bypassing the supercharger.

A control device for an internal combustion engine is configured to control an exhaust gas flow rate adjusting device for adjusting the flow rate of exhaust gas supplied to a turbine of a turbocharger on the basis of the difference between the target value of the first boost pressure at a part of an intake channel between a compressor of the turbocharger and an electrically driven compressor and the detection value of the first boost pressure with a first pressure sensor, and to control the electrically driven compressor on the basis of the difference between the target value of the second boost pressure at a part of the intake channel on the downstream side of the electrically driven compressor and the detection value of the second boost pressure with a second pressure sensor.

An internal combustion engine comprising the fuel injector arranged in the combustion chamber. The primary fuel injection and the secondary fuel injection from the fuel injector are successively performed to cause autoignition of an injected fuel of the primary fuel injection and autoignition of an injected fuel of the secondary fuel injection. A temperature region suppressing change of an ignition delay time where a change of ignition delay time with respect to a rise in temperature in the combustion chamber is suppressed appears in the compression stroke at a temperature in the combustion chamber of 700K to 900K. The secondary fuel injection is performed if the temperature in the combustion chamber is a temperature within the temperature region suppressing change of the ignition delay time during the compression stroke. The primary fuel injection is performed during the compression stroke or suction stroke before the temperature in the combustion chamber reaches a temperature in the temperature region suppressing change of the ignition delay time at a fuel injection timing at which the injected fuel of the secondary fuel injection is autoignited after the injected fuel of the primary fuel injection is autoignited.

The invention relates to a method and to a regulating device for regulating an air-fuel ratio of an internal combustion engine (10), wherein an exhaust-gas composition of an exhaust gas of the internal combustion engine (10) is determined by virtue of an actual probe signal, which is dependent on the exhaust-gas composition, being detected by means of an exhaust-gas probe (22) and the exhaust-gas composition being determined as a function of the actual probe signal by means of a characteristic curve or a calculation rule, and wherein the determined exhaust-gas composition is compared with a setpoint value or a threshold value, the attainment or exceedance of which triggers a manipulation of the air-fuel ratio supplied to the internal combustion engine (10), wherein, in order to take into consideration at least one disturbance variable which affects the actual probe signal, a safety margin (S) is defined which is applied to the characteristic curve or calculation rule, to the actual probe signal or to the setpoint value or threshold value. It is provided that an evaluation of a present accuracy of the at least one disturbance variable and/or of a present influence of the at least one disturbance variable on the probe signal is performed, and the safety margin (S) owing to the at least one disturbance variable is defined as a function of the evaluation.

A method to monitor an operating characteristic in a combustion engine: creating a monitoring matrix divided into a number of sections for storage of information, wherein each section is associated with specific intervals of engine speed and torque requested from the engine T.sub.1. When the engine is used during an operational time window with a pre-determined duration, measuring or estimating an operating characteristic and associating the characteristic with the monitoring matrix's respective section, associated with the current engine speed and the torque requested. For each section in the monitoring matrix, calculating at least one statistical parameter describing the operating characteristic associated with this section during the current operational time window; storing the statistical parameter(s) in the respective section. At the end of the operational time window, storing information in the monitoring matrix in an individual storage matrix associated with the operational time window, wherein the monitoring matrix is emptied of information.

A prediction module generates predicted engine operating parameters for a set of possible target values based on a plurality of values indicative of states of the engine and a first set of predetermined values set based on characteristics of the engine. A parameter estimation module determines one or more estimated operating parameters of the vehicle based on the plurality of values indicative of states of the engine and a second set of predetermined values. A cost module determines a cost for the set of possible target values based on the predicted engine operating parameters. A selection module, based on the cost, selects the set of possible target values from a group including the set of possible target values and N other sets of possible target values, wherein N is an integer greater than zero, and sets target values based on the selected set of possible target values.

A method of identifying an unknown fuel used by an internal combustion engine in a vehicle. A set of sensor models is prepared, each model representing measurements of an on-board sensor for different known fuels. The sensor models are for sensors from various sensors carried on-board the vehicle, such as a crank sensor, NOx sensor, soot sensor, and exhaust temperature sensor. While the vehicle is in operation, measurement data from two or more sensors of the sensor group is acquired and delivered to an on-board fuel identification process, which applies a statistical analysis to identify the fuel as being one of the known fuels.