Abstract: A method and a device for regulating the combustion noise of an internal combustion engine includes operating the internal combustion engine, detecting a profile of the cylinder pressure in the engine over time, determining a profile of the gradient of the cylinder pressure over time, defining the temporal position of the maximum of the pressure gradient in the determined profile, and modifying at least one parameter that is relevant to the combustion of fuel in the engine, wherein the pressure profile is detected, the pressure gradient is determined, and the temporal position of the maximum of the pressure gradient is defined until the temporal position of the maximum of the pressure gradient begins to fluctuate within a plurality of engine combustion cycles that follow one another. Furthermore, an engine controller having such a device and a computer program for carrying out such a method are described.

Abstract: A method for determining a mass of fuel injected into an internal combustion engine cylinder provided with a pressure sensor, includes: determining the temperature prevailing in the cylinder and amount heat released from the measured pressure; integrating amounts of heat released over a predetermined time interval to determine a cumulative amount of heat; estimating the heat losses by taking into account heat losses due to radiation and which are dependent on the measured temperature to the fourth power, and heat losses due to conduction and/or convection and dependent on both the measured temperature and corresponding engine speed, according to the formula: QP=? HRCUM, where QP is the amount of heat corresponding to the heat losses, HRCUM is the cumulative amount of heat, a is a corrective factor; and determining the amount of fuel injected, which is proportional to the cumulative amount of heat added to the heat losses.

Abstract: A method and a device for regulating the combustion noise of an internal combustion engine includes operating the internal combustion engine, detecting a profile of the cylinder pressure in the engine over time, determining a profile of the gradient of the cylinder pressure over time, defining the temporal position of the maximum of the pressure gradient in the determined profile, and modifying at least one parameter that is relevant to the combustion of fuel in the engine, wherein the pressure profile is detected, the pressure gradient is determined, and the temporal position of the maximum of the pressure gradient is defined until the temporal position of the maximum of the pressure gradient begins to fluctuate within a plurality of engine combustion cycles that follow one another. Furthermore, an engine controller having such a device and a computer program for carrying out such a method are described.