KR-102962269-B1 - HYBRID VEHICLE AND CONTROL METHOD THEREOF

KR102962269B1KR 102962269 B1KR102962269 B1KR 102962269B1KR-102962269-B1

Abstract

A hybrid vehicle and a method for controlling the same are disclosed. A hybrid vehicle according to an embodiment of the present invention may include: an engine that generates power by the combustion of fuel; a drive motor that generates power and optionally operates as a generator to generate electrical energy; a battery that supplies electrical energy to the drive motor and charges the electrical energy generated by the drive motor; a battery management system that measures the state of charge (SOC) of the battery; and a controller that determines the final target torque of the engine in HEV mode based on the state of charge (SOC) range to which the state of charge (SOC) of the battery measured by the battery management system belongs.

Inventors

신동준
정민기
이장효
김태형

Assignees

현대자동차 주식회사
기아 주식회사

Dates

Publication Date: 20260508
Application Date: 20210629

Claims (14)

An engine that generates power through the combustion of fuel; A drive motor that generates power and optionally operates as a generator to produce electrical energy; A battery that supplies electrical energy to the above-mentioned drive motor and charges the electrical energy generated by the above-mentioned drive motor; A battery management system for measuring the SOC of the above battery; and A controller that determines the final target torque of the engine in HEV mode based on the SOC range to which the state of charge (SOC) of the battery measured by the battery management system belongs; Includes, The above SOC section is First interval where SOC is greater than or equal to the first set value, A second interval in which SOC is between the first setting value and a second setting value smaller than the first setting value, and It includes a third interval in which the SOC is smaller than the second setting value, If the SOC of the above battery falls within the above second section, A hybrid vehicle in which the controller determines the larger value among the smaller value between the driver's requested torque and the intermediate stage partial load maximum torque, and the engine's base target torque, which is the engine torque determined at the optimal driving line, as the final target torque.
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In paragraph 1, If the SOC of the above battery falls within the above first section, A hybrid vehicle in which the above controller determines the engine torque determined at the optimal driving line as the final target torque.
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In paragraph 1, The maximum torque of the intermediate stage partial load mentioned above is A hybrid vehicle calculated through the corrected partial load maximum torque with a correction factor reflected and the corrected partial load maximum torque with a correction factor excluded.
In paragraph 5, The above intermediate stage partial load maximum torque is calculated by multiplying the corrected partial load maximum torque by a correction factor, and The above correction factor is the ratio of the partial load maximum torque before correction to the partial load maximum torque after correction for a hybrid vehicle.
In paragraph 1, If the SOC of the above battery falls within the above third section, A hybrid vehicle in which the above controller determines the larger value between the engine's base target torque, which is the engine torque determined at the optimal driving line, and the corrected partial load maximum torque as the final target torque.
As a control method for a hybrid vehicle that determines the final target torque of an engine in HEV mode, Step of setting the base target torque of the above engine; A step of determining the SOC range to which the battery's SOC belongs; A step of determining the final target torque based on the range to which the SOC of the battery belongs; Includes, The above SOC section is First interval where SOC is greater than or equal to the first set value, A second interval in which SOC is between the first setting value and a second setting value smaller than the first setting value, and It includes a third interval in which the SOC is smaller than the second setting value, If the SOC of the above battery falls within the above second section, A control method for a hybrid vehicle in which the larger value between the driver's required torque and the intermediate stage partial load maximum torque, and the engine's base target torque which is the engine torque determined at the optimal driving line, is determined as the final target torque.
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In paragraph 8, If the SOC of the above battery falls within the above first section, A control method for a hybrid vehicle in which the engine torque determined at the optimal driving line is determined as the final target torque.
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In paragraph 8, The maximum torque of the intermediate stage partial load mentioned above is A control method for a hybrid vehicle calculated through the partial load maximum torque after correction with a correction factor reflected and the partial load maximum torque before correction with a correction factor excluded.
In Paragraph 12, The above intermediate stage partial load maximum torque is calculated by multiplying the corrected partial load maximum torque by a correction factor, and The above correction coefficient is the ratio of the partial load maximum torque before correction to the partial load maximum torque after correction, in a control method for a hybrid vehicle.
In paragraph 8, If the SOC of the above battery falls within the above third section, A control method for a hybrid vehicle in which the larger value between the engine's base target torque, which is the engine torque determined at the optimal driving line, and the corrected partial load maximum torque is determined as the final target torque.

Description

Hybrid vehicle and control method thereof The present invention relates to a hybrid vehicle and a method for controlling the same. A hybrid vehicle is a car that uses two or more power sources, generally referring to a hybrid electric vehicle driven by an engine and a motor. Hybrid electric vehicles can form various structures by utilizing two or more power sources consisting of an engine and a motor. Generally, hybrid electric vehicles use a TMED (Transmission Mounted Electric Device) type powertrain in which the drive motor, transmission, and drive shaft are connected in series. In addition, a clutch is provided between the engine and the motor, and depending on whether the clutch is engaged, the hybrid electric vehicle operates in either EV (Electric Vehicle) mode or HEV (Hybrid Electric Vehicle) mode. EV mode is a mode in which the vehicle is driven solely by the driving force of the motor, while HEV mode is a mode in which the vehicle is driven by the driving force of both the motor and the engine. When a hybrid vehicle operates in HEV mode, engine torque is generally determined around the optimal operating line (OOL). This is intended to optimize engine efficiency and system efficiency. In this case, the engine efficiency map (bsfc map: break-specific fuel consumption map) used to determine the optimal operating line is determined through engine experiments under standard conditions at ambient temperature. However, when a hybrid vehicle is driven on actual roads, as the ambient temperature or the temperature inside the engine compartment rises, the temperature of the intake air entering the engine increases, and the filling efficiency changes due to the change in the density of the intake air. Consequently, the vehicle's ECU (engine control unit) adjusts the ignition timing and other parameters to compensate for the engine output resulting from the decrease in filling efficiency, and as a result, engine efficiency deteriorates compared to the standard condition. Furthermore, the engine's operating point is differentiated based on the battery's State of Charge (SOC); when the battery's SOC is at a normal level, the engine torque is determined near the optimal operating line. However, when the battery's SOC drops to a critical level, the engine rapidly outputs torque greater than that at the optimal operating line to charge the battery and secure sufficient torque. In such cases, engine efficiency deteriorates rapidly, leading to a problem of reduced vehicle fuel economy. The matters described in this background technology section are written to enhance understanding of the background of the invention and may include matters that are not prior art already known to those skilled in the art to which this technology belongs. These drawings are for reference to explain exemplary embodiments of the present invention, and therefore, the technical concept of the present invention should not be interpreted as being limited to the attached drawings. FIG. 1 is a conceptual diagram illustrating the configuration of a hybrid vehicle according to an embodiment of the present invention. FIG. 2 is a block diagram illustrating the configuration of a hybrid vehicle according to an embodiment of the present invention. FIG. 3 is a flowchart illustrating a control method for a hybrid vehicle according to an embodiment of the present invention. FIG. 4 is a graph for explaining the operation of a hybrid vehicle according to an embodiment of the present invention. Embodiments of the present invention are described in detail with reference to the attached drawings so that those skilled in the art can easily implement the invention. However, the present invention may be embodied in various different forms and is not limited to the embodiments described herein. To clearly explain the present invention, parts unrelated to the explanation have been omitted, and the same reference numerals are used for identical or similar components throughout the specification. In addition, the size and thickness of each component shown in the drawings are depicted arbitrarily for the convenience of explanation, so the present invention is not necessarily limited to what is shown in the drawings, and the thickness has been enlarged to clearly represent various parts and regions. Hereinafter, a hybrid vehicle according to an embodiment of the present invention will be described in detail with reference to the attached drawings. FIG. 1 is a conceptual diagram illustrating the configuration of a hybrid vehicle according to an embodiment of the present invention. FIG. 2 is a block diagram illustrating the configuration of a hybrid vehicle according to an embodiment of the present invention. As illustrated in FIGS. 1 and 2, a hybrid vehicle according to an embodiment of the present invention may include an engine (10), a starter generator (20), a drive motor (30), a clutch (40), a battery (50), a battery management system (70), and a controller (90).