DE-102017105446-B4 - Method for controlling a hybrid powertrain system and hybrid powertrain system

DE102017105446B4DE 102017105446 B4DE102017105446 B4DE 102017105446B4DE-102017105446-B4

Abstract

Method for controlling a hybrid powertrain system (20) for a vehicle (100) comprising an internal combustion engine (40) and an electric machine (34, 36) mechanically coupled via a transmission (50) to generate mechanical power transferable to a powertrain and electrical energy, wherein the electrical energy is storable on an energy storage device (25), the method comprising: Determining an operator-selected mode and charging operation for the energy storage device (25); for the operator-selected mode and charging operation for the energy storage device (25): Determining a first speed/load range at which the internal combustion engine (40) is in an OFF state, wherein the first speed/load range is defined by the output torque and the vehicle speed, Determining a second speed/load range which has a speed preferred for the operation of the internal combustion engine (40), wherein the second speed/load range is defined by the output torque and the vehicle speed and wherein the preferred speed is essentially not perceptible in a passenger compartment of the vehicle (100); Determining an output torque requirement and a current vehicle speed; Operating the internal combustion engine (40) at the preferred engine speed, which is not perceptible in the passenger compartment, when the output torque requirement and the current vehicle speed is within the second operating range; and Controlling the electric machine (34, 36) and the internal combustion engine (40) to work together to generate the output torque in response to the output torque request when the output torque request is greater than a maximum output torque state associated with the vehicle speed of the second operating range.

Inventors

Scott P. Lyons
John J. Janczak
Tim M. Grewe

Assignees

GM Global Technology Operations LLC

Dates

Publication Date: 20260513
Application Date: 20170314
Priority Date: 20160823

Claims (9)

Method for controlling a hybrid powertrain system (20) for a vehicle (100) comprising an internal combustion engine (40) and an electric machine (34, 36) mechanically coupled via a transmission (50) to generate mechanical power transferable to a powertrain and electrical energy, wherein the electrical energy is storable on an energy storage device (25), the method comprising: determining an operator-selected mode and charging operation for the energy storage device (25); for the operator-selected mode and charging operation for the energy storage device (25): determining a first speed/load range in which the internal combustion engine (40) is in an OFF state, wherein the first speed/load range is defined by the output torque and the vehicle speed; determining a second speed/load range which is suitable for the operation of the internal combustion engine. (40) has a preferred speed, wherein the second speed/load range is defined by the output torque and the vehicle speed, and wherein the preferred speed is substantially imperceptible in a passenger compartment of the vehicle (100); determining an output torque requirement and a current vehicle speed; operating the internal combustion engine (40) at the preferred engine speed, which is imperceptible in the passenger compartment when the output torque requirement and the current vehicle speed are within the second operating range; and controlling the electric machine (34, 36) and the internal combustion engine (40) to work together to generate the output torque in response to the output torque requirement when the output torque requirement is greater than a maximum output torque state associated with the vehicle speed of the second operating range.
Procedure according to Claim 1 , further comprising controlling the electric machine (34, 36) to generate an output torque depending on the output torque requirement, while the internal combustion engine (40) is operated at the preferred engine speed, which is not perceptible in the passenger compartment when the output torque requirement and the vehicle speed are within the second operating range.
Procedure according to Claim 1 , furthermore comprising controlling the electric machine (34, 36) to generate an output torque in response to the output torque request when the output torque request and the vehicle speed are within the first operating range.
Procedure according to Claim 1 , where the charging mode includes a charge maintenance mode.
Procedure according to Claim 1 , where the charging mode includes a charge depletion mode.
Procedure according to Claim 1 , wherein the operator-selected mode includes a normal mode that refers to a transmission circuit diagram.
Procedure according to Claim 1 , wherein the operator-selected mode includes a sport mode which refers to a transmission circuit diagram.
Procedure according to Claim 1 , wherein the preferred engine speed, which is essentially imperceptible in a passenger compartment of the vehicle (100), comprises an engine speed in which a sound power generated by the operation of the internal combustion engine (40) is less than a sound energy generated by the operation of the vehicle (100) on a level road surface in conjunction with the operation of the internal combustion engine.
Hybrid powertrain system (20) for a vehicle (100), comprising: an internal combustion engine (40) and an electric machine (34, 36) mechanically coupled via a transmission (50) to generate mechanical power transferable to a powertrain and electrical energy, the electrical energy being storable on an energy storage device (25); and a control unit (10) comprising a set of instructions executable to: determine an operator-selected mode and charging operation for the energy storage device (25); For the operator-selected mode and charging operation for the energy storage device (25): Determining a first speed/load range in which the internal combustion engine (40) is in an OFF state, wherein the first speed/load range is defined by the output torque and the vehicle speed; Determining a second speed/load range that has a preferred speed for operating the internal combustion engine (40), wherein the second speed/load range is defined by the output torque and the vehicle speed, and wherein the preferred speed is essentially imperceptible in a passenger compartment of the vehicle (100); Determining an output torque requirement and a current vehicle speed; Operating the internal combustion engine (40) at the preferred engine speed, which is imperceptible in the passenger compartment, when the output torque requirement and the current vehicle speed are within the second operating range; and controlling the electric machine (34, 36) and the internal combustion engine (40) to work together to generate the output torque in response to the output torque request when the output torque request is greater than a maximum output torque state associated with the vehicle speed of the second operating range.

Description

TECHNICAL AREA This invention relates to powertrain systems that use multiple torque-generating devices and associated dynamic system controls. In particular, the invention relates to a method for controlling a hybrid powertrain system and to a hybrid powertrain system. From the DE 10 2016 209 851 A1 For example, a method for controlling a hybrid powertrain system has become known in which the combustion engine and the electric machine are controlled in such a way that no audible engine noise occurs. Regarding the further state of the art, reference should be made at this point to the printed publications. DE 10 2010 039 653 A1 , US 8 323 147 B2 and WO 02 / 042 110 A1 referred to those who also deal with noise reduction in combustion engines. BACKGROUND Hybrid powertrain systems generate drive torque from two or more energy sources, e.g., from hydrocarbon-based fuels through an internal combustion engine, and from electrical energy through one or more electric machines, with the drive torque being transmitted via a transmission train to an output element coupled to a powertrain. Control systems for the operation of hybrid drive systems manage the torque output of the engine and electric machine(s) and employ torque transmission elements in the transmission to transfer torque in response to driver-directed output torque demands, taking into account fuel consumption, emissions, drivability, and other factors. A control system monitors various inputs from the vehicle and the operator and provides operational control of the hybrid powertrain, including controlling the transmission operating mode and gear shifting, controlling torque outputs from the engine and electric machine(s), and regulating the electrical power exchange between the electrical energy storage device and the electric machines to manage the transmission outputs, including torque and speed. Hybrid powertrain systems can operate in an electric vehicle (EV) mode, where all drive torque is generated by the electric machine(s) with the internal combustion engine in an OFF state, and in electrically variable operating modes (EVT), where the internal combustion engine is in an ON state and can generate some or all of the drive torque or transfer it to an electric machine to generate electrical energy that can be transferred to the electric machine(s) to generate drive torque. Operating a hybrid powertrain system in EV mode can increase customer satisfaction. However, operating in EV mode at or near the system's limits for such operation can decrease customer satisfaction related to engine startability and tip-in response. SUMMARY A method for controlling a hybrid powertrain system for a vehicle is described and includes the features of claim 1. Furthermore, a hybrid powertrain system with the features of claim 9 is proposed. BRIEF DESCRIPTION OF THE DRAWINGS The following describes one or more exemplary designs with reference to the attached drawings, in which: 1 schematically represents a hybrid drive system comprising an internal combustion engine, transmission and electric combustion machines coupled to a drivetrain, according to the disclosure; 2 schematically illustrates a signal flow diagram for a powertrain control routine for controlling an embodiment of the powertrain system, which refers to 1 described, including the advantageous operation of the internal combustion engine within a speed range that is not perceptible in the passenger compartment under conditions defined by the output torque requirement and the vehicle speed, according to the disclosure; 3 illustrates a variety of operating ranges defined by a vehicle speed and a transmit output power associated with a first control strategy, including the operation of the powertrain system in normal mode with charge depletion of the energy storage device according to the disclosure; 4 graphically illustrates a variety of operating ranges defined by vehicle speed and transmission output power associated with the second control strategy, including the operation of the powertrain system in the engine normal operating mode, the energy storage device, in accordance with the disclosure; 5 graphically illustrates a variety of operating ranges defined by vehicle speed and transmission output power associated with the second control strategy, including operation of the powertrain system in Sport mode with charge depletion of the energy storage device as disclosed; and 6 graphically illustrates a variety of operating ranges defined by vehicle speed and transmission output power, which are associated with the fourth control strategy including the operation of the powertrain system mode, the energy storage device, in accordance with the disclosure. DETAILED DESCRIPTION The following text refers to the drawings, the illustrations of which serve only to demonstrate certain exemplary embodiments, whereby 1 Figure 1 is a schematic diagram of a vehicle 100, which includes a drive system 20 coupled to a fina