Minimization of the combustion noise of an internal combustion engine based on a detection of an instability of the position of the maximum of a cylinder pressure gradient

摘要

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.

主权项

1. An engine controller for an an auto-ignition internal combustion engine of a motor vehicle, the engine controller comprising:
a device comprising:
a control unit configured to control an operation of the internal combustion engine,an acquisition unit configured to acquire a pressure profile indicating a pressure in a cylinder of the internal combustion engine over time,an ascertainment unit configured to ascertain a pressure gradient profile with respect to time of a pressure gradient which is the derivative with respect to time of the acquired profile with respect to time of the pressure,a determination unit configured to determine a pressure gradient profile indicating a pressure gradient over time, the pressure gradient profile comprising the derivative of the acquired pressure profile, anda modification unit configured to modify at least one parameter related to combustion of fuel in the internal combustion engine,wherein the pressure profile is acquired by the acquisition unit the pressure gradient profile is ascertained by the ascertainment unit, and the temporal position of the maximum of the pressure gradient is determined by the determination unit until the temporal position of the maximum of the pressure gradient begins to fluctuate within a multiplicity of successive working cycles of the internal combustion engine.