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EP-4741241-A1 - COMPUTER-IMPLEMENTED METHOD FOR DETERMINING DRIVING DATA FOR A HYBRID DRIVE

EP4741241A1EP 4741241 A1EP4741241 A1EP 4741241A1EP-4741241-A1

Abstract

A computer-implemented method for determining control data for a hybrid drive with an internal combustion engine and an electric motor for a vehicle, comprising the steps of: receiving target torque data for the hybrid drive (S10); determining internal combustion engine control data for the internal combustion engine based on the received target torque data (S20); determining electric motor control data for the electric motor (S30); wherein the internal combustion engine control data are determined such that a torque gradient of the internal combustion engine is limited; and wherein the electric motor control data are determined based on the target torque data for the hybrid drive and internal combustion engine engine torque resulting from the determined internal combustion engine control data; providing the determined electric motor control data and the determined internal combustion engine control data (S40); where a corresponding EGR rate is determined to provide the internal combustion engine control data based on the limited torque gradient.

Inventors

  • KRAUS, STEPHAN
  • Bunkus, Johannes

Assignees

  • Volkswagen Aktiengesellschaft

Dates

Publication Date
20260513
Application Date
20251023

Claims (11)

  1. Computer-implemented method for determining control data for a hybrid drive with an internal combustion engine and an electric motor for a vehicle, comprising the following steps: Receiving target torque data for the hybrid drive (S10); Determining internal combustion engine control data for the internal combustion engine based on the received target torque data (S20); Determining electric motor control data for the electric motor (S30); wherein the combustion force control data are determined in such a way as to limit the torque gradient of the internal combustion engine; and wherein the electric motor control data are determined based on the target torque data for the hybrid drive and internal combustion engine engine torques resulting from the specified internal combustion engine control data; Providing the specified electric motor control data and the specified internal combustion engine control data (S40); where a corresponding EGR rate is determined to provide the internal combustion engine control data based on the limited torque gradient.
  2. Method according to claim 1, where a corresponding filling is determined based on the limited torque gradient.
  3. Method according to claim 1 or 2, wherein the torque gradient is limited to 80% of a maximum torque gradient of the internal combustion engine, in particular to 70%, in particular to a range of 60% to 70%.
  4. Method according to any of the preceding claims, where the torque gradient is limited to below 80 Nm/s.
  5. Method according to any of the preceding claims, where the torque gradient is limited to below 50 Nm/s, in particular in a range above 30 Nm/s and below 50 Nm/s.
  6. Method according to any of the preceding claims, wherein the torque gradient of the internal combustion engine is limited when the temperature of an exhaust gas of the internal combustion engine is below a limit value, in particular below 220°C, in particular below 210°C, in particular below 200°C.
  7. Method according to claim 6, where, if the temperature of the exhaust gas of the internal combustion engine is above the limit value, the torque gradient is not limited, and the internal combustion engine control data and electric motor control data are determined on the basis of the target torque data.
  8. Method according to claims 6 and 7, wherein a transition between limited and unlimited torque gradient is defined for an intermediate range of 10K, preferably 5K.
  9. Control system for executing a method according to any one of claims 1 to 8.
  10. Hybrid drive, with a control system according to claim 9.
  11. Motor vehicle, with a control system according to claim 9 and/or a hybrid drive according to claim 10.

Description

The present invention relates to a computer-implemented method for determining control data for a hybrid drive, a control system for executing such a method, a hybrid drive with such a control system, and a motor vehicle with such a control system and/or such a hybrid drive. Hybrid drives for motor vehicles are a well-established technology. These drives comprise an internal combustion engine and an electric motor. The electric motor can be used to support the internal combustion engine. For example, a so-called boost mode can be implemented to increase the maximum power output of the internal combustion engine, or a phlegmatization mode can be implemented, which involves a targeted reduction in the power output of the internal combustion engine and the compensation of this reduction by the electric motor, in order to, for example, reduce pollutant emissions. However, in some cases, certain pollutant emission values may also worsen. From the DE 10 2015 226 216 A1 A method for operating a motor vehicle with a hybrid drive is known which, when an increased load requirement occurs for the internal combustion engine in a phase with a rich air/fuel mixture, keeps the torque of the internal combustion engine constant and provides the additional required torque via an electric machine. From the DE 10 2019 115 209 A1 A method for operating a hybrid drive is known in which a maximum achievable torque gradient of an internal combustion engine is reduced in such a way that an actual exhaust gas recirculation rate during a transition from a first load level to a second load level remains close to a target exhaust gas recirculation rate. From the DE 10 2017 100 878 A1 A method for operating a hybrid motor vehicle is known in which the high load range is exited by setting up a boost operation or, if a boost operation is not possible and an alternative gear stage cannot be selected, by limiting the engine torque of the diesel engine. From the DE 10 2020 203 007 A1 A method for operating a hybrid drive system is known in which an electric motor system is controlled with a compensation current that balances electrical loss currents of the electric motor system. In this context, it has now become apparent that there is a need to provide a method for determining control data for a hybrid drive. In particular, there is a need to provide an improved method for determining control data for a hybrid drive. It is therefore an object of the present invention to overcome, or at least partially overcome, the disadvantages described above in the control of hybrid drives for motor vehicles. In particular, it is an object of the present invention to provide an improved method for determining control data for a hybrid drive. The foregoing object is achieved by the claims. In particular, the object is achieved by a computer-implemented method for controlling a hybrid drive with the features of independent claim 1. Furthermore, the object is achieved by a controller with the features of claim 9, a hybrid drive with the features of claim 10, and a motor vehicle with the features of claim 11. Features described in connection with the inventive method naturally also apply in connection with the inventive control system, the inventive hybrid drive and the inventive motor vehicle, and vice versa, so that the disclosure regarding the individual aspects of the invention always refers to each other or can refer to each other. According to a first aspect of the present invention, a computer-implemented method for determining control data for a hybrid drive with an internal combustion engine and an electric motor for a vehicle is provided, comprising the steps of: receiving target torque data for the hybrid drive, determining internal combustion engine control data for the internal combustion engine based on the received target torque data, determining electric motor control data for the electric motor, wherein the internal combustion engine control data are determined such that a torque gradient of the internal combustion engine is limited, and wherein the electric motor control data are determined based on the target torque data for the hybrid drive and internal combustion engine motor torques resulting from the determined internal combustion engine control data, and providing the determined electric motor control data and the determined internal combustion engine control data, wherein the Internal combustion engine control data is used to determine a corresponding EGR rate based on the limited torque gradient. The term "control data" in this context refers to data configured to control the internal combustion engine and the electric motor. This control data includes both internal combustion engine control data and electric motor control data. The internal combustion engine control data may include data that controls at least one actuator influencing the torque or torque gradient of the internal combustion engine. This actuator may include one of