Determining operating states of an internal combustion engine by means of a generator regulator of an electric machine coupled to the internal combustion engine

Abstract

The invention relates to a method for determining an operating state (128a, 132a) of an internal combustion engine (112). The method includes the following steps: determining the temporal course of arotational speed (122) of an electric machine (114) coupled to the internal combustion engine (112); determining a mean value (DMD) of the rotational speed (122) from the temporal course of the rotational speed (122) and determining at least one rotational speed pattern (128, 132), produced by the internal combustion engine (112), from the temporal course of the rotational speed (122), the rotational speed pattern having an oscillation (O) superimposed over the temporal course of the mean value (DMD) of the rotational speed (122); and determining at least one operating state (128a, 132a) of the internal combustion engine (112) by comparing the mean value (DMD) of the rotational speed (122) to a first threshold value (Thl) and comparing an undulation (W) of the oscillation (O) superimposedover the temporal course of the mean value (DMD) of the rotational speed (122) to a rotational speed range (B). Furthermore, the invention relates to a corresponding computing unit (118) which is configured to carry out the method, to an electric machine (114) comprising the computing unit (118) and to a corresponding computer program.

Description

technical field The invention relates to a method for determining the operating state of an internal combustion engine, a computing unit, preferably a controller for an electric machine, and a computer program for carrying out the method. Background technique To regulate the onboard electrical system voltage in a vehicle, electric machines, in particular externally excited electric machines, can be used. The electric machine has a regulator which regulates the field current of the electric machine as a function of the vehicle electrical system voltage. Such an electric machine is known from DE 10 2012 204 751 A1. It is also possible to use a so-called intelligent controller, which regulates, for example, a higher field current to the electric motor in the "freewheeling" operating state in order to recuperate electrical energy, or in the "accelerating" operating state of the internal combustion engine Reduce the output current of the motor to provide more driving torque to...

AI Technical Summary

Problems solved by technology

However, this method is very complex, since the individual operating states of the internal combustion engine are only determined externally by the engine controller of the internal combustion engine, the determined operating states are transmitted to the controller of the electric machine, which then responds to the electric machine if necessary Adjustment settings for the individual operating states of the internal combustion engine

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