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DE-102025129396-B3 - Method for operating an internal combustion engine of a motor vehicle and motor vehicle

DE102025129396B3DE 102025129396 B3DE102025129396 B3DE 102025129396B3DE-102025129396-B3

Abstract

The invention relates to a method for operating an internal combustion engine of a motor vehicle, in which a cascade control system is used. In this system, a first quantity of air, the first quantity of which is introduced into a combustion chamber of the internal combustion engine, and a second quantity of fuel, the second quantity of which is introduced into the combustion chamber of the internal combustion engine, are controlled by means of two controllers (4, 5) of two nested control loops (2, 3). For a first controller (4, 5), a first correction value is determined, which characterizes a first control deviation (RA1) that is applied to the first controller (4). For a second controller (4, 5), a second correction value is determined, which characterizes a second control deviation (RA2) that is applied to the second controller (5). From the correction values of the controllers (4, 5), a common adaptation value is determined, which is stored in a memory network common to the controllers.

Inventors

  • Tobias Sollinger
  • Pedro Gaitan
  • Ralf Mack

Assignees

  • BAYERISCHE MOTOREN WERKE AKTIENGESELLSCHAFT

Dates

Publication Date
20260513
Application Date
20250725

Claims (5)

  1. Method for operating an internal combustion engine of a motor vehicle, in which: - a cascade control is carried out, in which, by means of two controllers (4, 5) of two nested control loops (2, 3), a first quantity of air, the first quantity of which is introduced into a combustion chamber of the internal combustion engine, and a second quantity of fuel, the second of which The quantity of air introduced into the combustion chamber of the internal combustion engine is influenced; - a first correction value is determined for a first controller (4, 5), which characterizes a first control deviation (RA1) supplied to the first controller (4); - a second correction value is determined for a second controller (4, 5), which characterizes a second control deviation (RA2) supplied to the second controller (5); - an adaptation value common to the controllers (4, 5) is determined from the correction values and stored in a memory network common to the controllers; - the adaptation value is output from the memory network; and - both the first quantity of air and the second quantity of fuel are influenced depending on the adaptation value output from the memory network.
  2. Procedure according to Claim 1 , characterized in that: - during a first operation of the internal combustion engine at a first operating point of the internal combustion engine, the first correction value, which characterizes the first control deviation (RA1) occurring during the first operation of the internal combustion engine at the first operating point, and the second correction value, which characterizes the second control deviation (RA2) occurring during the first operation of the internal combustion engine at the first operating point, are determined; - the adaptation value determined from the correction values is stored in a first storage network, which assigns the adaptation value to the first operating point; - during a second operation of the internal combustion engine following the first operation at a second operating point of the internal combustion engine that differs from the first operating point, the adaptation value is transferred from the first storage network to a second storage network and stored in the second storage network, which assigns the adaptation value to the first operating point; and - in the case of a third operation of the internal combustion engine following the second operation at the first operating point: ◯ the adaptation value is output from the second storage network; and ◯ both the first quantity and the second quantity are influenced depending on the adaptation value output from the second storage network.
  3. Procedure according to Claim 2 , characterized in that: - during a fourth operation of the internal combustion engine following the third operation at the first operating point: ◯ the first correction value is subtracted from a first controller value provided by the first controller (4) and intended to influence the first quantity, thereby calculating a third correction value for the first operating point; and ◯ the second correction value is subtracted from a second controller value provided by the second controller (5) and intended to influence the second quantity, thereby calculating a fourth correction value for the first operating point; - a second adaptation value is determined from the third correction value and the fourth correction value, which, during the fourth operation of the internal combustion engine at the first operating point, is stored in the first storage network as the first adaptation value instead of the adaptation value, and which assigns the second adaptation value to the first operating point; - during a fifth operation of the internal combustion engine following the fourth operation, at the second operating point, or at a third operating point of the internal combustion engine that differs from the first and second operating points, the second adaptation value is transferred from the first storage network to the second storage network and stored in the second storage network instead of the first adaptation value, which assigns the second adaptation value to the first operating point; and - during a sixth operation of the internal combustion engine following the fifth operation, at the first operating point: ◯ the second adaptation value is output from the second storage network; and ◯ both the first quantity and the second quantity are influenced depending on the second adaptation value output from the second storage network.
  4. Procedure according to Claim 2 or 3 , characterized in that: - a residual oxygen content in the exhaust gas of the internal combustion engine is detected by means of a sensor device; - a combustion air ratio of the internal combustion engine is determined as a function of the detected residual oxygen content; - the determined combustion air ratio is used as a control variable of the cascade control; and - one of the control deviations is a deviation of the controlled variable from a predetermined or predeterminable reference variable of the cascade control.
  5. motor vehicle, with an internal combustion engine, by means of which the motor vehicle is propellable, wherein the motor vehicle is designed to carry out a method according to one of the preceding claims.

Description

The present invention relates to a method for operating an internal combustion engine of a motor vehicle. The invention further relates to a motor vehicle with such an internal combustion engine. The EP 2 002 103 B1 discloses a method for controlling the injection profile of a direct-injection internal combustion engine of a vehicle. From the US 7 938 101 B2 An adaptive fuel supply control system is known to exist. From the CN 1 10 352 296 B An adaptive torque distribution is known. Furthermore, the DE 10 2007 012 604 B4 A method for controlling the injection of an injector in a direct-injection internal combustion engine. Furthermore, the following are included: US 2012 / 0 253 638 A1 the WO 01 / 38 709 A1 and the US 2016 / 0 084 192 A1 to the state of the art. Furthermore, the DE 10 2023 203 542 A1 A method for controlling the soot-NOx ratio in the exhaust gas of an internal combustion engine. A nitrogen oxide (NOx) reading from a NOx sensor in the exhaust gas of the engine is recorded. The control deviation between the actual NOx value and a target NOx value is determined. A manipulated variable is controlled based on this control deviation. Additionally, a variable in another control loop is adjusted based on the manipulated variable, with this second control loop also influencing the soot-NOx ratio. The object of the present invention is to provide a method for operating an internal combustion engine and a motor vehicle with such an internal combustion engine, so that particularly low-emission operation of the internal combustion engine can be achieved. This problem is solved according to the invention by a method with the features of claim 1 and by a motor vehicle with the features of claim 5. Advantageous embodiments of the invention are the subject of the dependent claims. A first aspect of the invention relates to a method for operating an internal combustion engine, also referred to as a combustion engine, of a motor vehicle, also referred to simply as a vehicle. This means that the motor vehicle, preferably designed as a motor vehicle, in particular as a passenger car, has the internal combustion engine and can be driven by means of the internal combustion engine. For example, in the method, the motor vehicle is driven by means of the internal combustion engine. For example, in the method, the internal combustion engine is operated in a fired mode, that is, in a fired operation of the internal combustion engine. The method employs a cascade control system, also referred to simply as a control system, which is also called cascaded control. The cascade control system comprises, in particular, at least or exactly, two nested controllers, namely a first controller and a second controller. These controllers influence a first quantity of air, also referred to as the air quantity, and a second quantity of a preferably liquid fuel, also referred to as the fuel quantity. Both the air quantity and the fuel quantity are introduced into a combustion chamber of the internal combustion engine, particularly within a single operating cycle. For example, the cascade control system is implemented using an electronic computing device, particularly in the motor vehicle, so that the method is carried out, for example, using the electronic computing device. The electronic computing device is or comprises, for example, at least or exactly one control unit, particularly in the motor vehicle. More specifically, the cascade control system implemented in the method according to the invention is understood to be a control system with, in particular, at least or exactly, two, in particular closed, control loops that are nested within each other. In this scenario, for example, the first controller is a controller of the first of the control loops, and the second controller is a controller of the second of the control loops. The characteristic of cascade control, where the controllers are nested, means that the control loops are nested within each other. For example, the first controller provides a first controller output, which could be a first manipulated variable. Similarly, the second controller provides a second controller output, which could be a second manipulated variable. Thus, the first controller output is assigned to the first controller and vice versa, and the second controller output is assigned to the second controller and vice versa. In particular, cascade control provides for a reference input to be derived from one of the controller outputs, specifically by calculating the reference input from the controller output and/or by using the controller output as the reference input. The reference input resulting from the controller output is used, for example, as the reference input for one of the controllers, specifically by feeding the reference input to that controller. For example, one controller sets the manipulated variable, which is determined by the A controller is provided, depending on one reference variab