US-12623663-B2 - Hybrid electric vehicle and vibration control method thereof

US12623663B2US 12623663 B2US12623663 B2US 12623663B2US-12623663-B2

Abstract

A hybrid electric vehicle and a vibration control method thereof is provided. The vibration control method of the hybrid electric vehicle includes: receiving rotor angle information of a motor generated based on information detected by a resolver; receiving first engine rotation-angle information of an engine generated based on information detected by a cam angle sensor or a crank angle sensor; generating engine rotation-angle candidates based on the rotor angle information; and identifying a second engine rotation-angle based on the engine rotation-angle candidates and the first engine rotation-angle information.

Inventors

Key Chun PARK
Sung Il Jung

Assignees

HYUNDAI MOTOR COMPANY
KIA CORPORATION

Dates

Publication Date: 20260512
Application Date: 20240320
Priority Date: 20231101

Claims (8)

1 . A vibration control method of a hybrid electric vehicle, the vibration control method comprising: receiving rotor angle information of a motor of the hybrid electric vehicle generated based on information detected by a resolver; receiving first engine rotation-angle information of an engine of the hybrid electric vehicle generated based on information detected by a cam angle sensor or a crank angle sensor; generating a plurality of engine rotation-angle candidates based on the rotor angle information, wherein the number of the plurality of engine rotation-angle candidates is determined based on a number of poles of a motor rotor magnet of the hybrid electric vehicle and regardless of a pulse resolution of the crank angle sensor; identifying a second engine rotation-angle based on the number of engine rotation-angle candidates and the first engine rotation-angle information; and controlling the engine based on the second engine rotation-angle.
2 . The vibration control method of claim 1 , wherein identifying the second engine rotation-angle comprises: identifying first and second indexes based on the engine rotation-angle candidates and the first engine rotation-angle information; and identifying the second engine rotation-angle based on the first and second indexes.
3 . The vibration control method of claim 2 , further comprising: storing the first and second indexes in a memory; and estimating the second engine rotation-angle again based on the stored first and second indexes and the rotor angle information of the motor next time an engine of the hybrid electric vehicle is started after the engine is turned off.
4 . The vibration control method of claim 2 , wherein the first and second indexes comprise values for indicating one of the engine rotation-angle candidates.
5 . A hybrid electric vehicle comprising: one or more rotor-angle operation units configured to generate rotor angle information of a motor of the hybrid electric vehicle based on information detected by a resolver; an engine rotation-angle operation unit configured to generate first engine rotation-angle information of an engine of the hybrid electric vehicle based on information detected by a cam angle sensor or a crank angle sensor; and a synchronization operation unit configured to generate a plurality of engine rotation-angle candidates based on the rotor angle information, wherein the number of the plurality of engine rotation-angle candidates is determined based on a number of poles of a motor rotor magnet of the hybrid electric vehicle and regardless of a pulse resolution of the crank angle sensor, to identify a second engine rotation-angle based on the number of engine rotation-angle candidates and the first engine rotation-angle information, and to control the engine based on the second engine rotation-angle.
6 . The hybrid electric vehicle of claim 5 , wherein the synchronization operation unit identifies first and second indexes based on the engine rotation-angle candidates and the first engine rotation-angle information and identifies the second engine rotation-angle based on the first and second indexes.
7 . The hybrid electric vehicle of claim 6 , wherein the synchronization operation unit stores the first and second indexes in a memory and estimates the second engine rotation-angle again based on the stored first and second indexes and the rotor angle information of the motor a next time the engine is started after the engine is turned off.
8 . The hybrid electric vehicle of claim 6 , wherein the first and second indexes comprise values for indicating one of the engine rotation-angle candidates.

Description

CROSS REFERENCE TO RELATED APPLICATION The present application claims priority to Korean Patent Application No. 10-2023-0149431, filed Nov. 1, 2023, the entire contents of which are incorporated herein for all purposes by this reference. BACKGROUND Field of the Disclosure The disclosure relates to a hybrid electric vehicle, and more particularly, to a hybrid electric vehicle and a vibration control method thereof. Description of the Related Art As an alternative to an internal combustion engine vehicle, an eco-friendly vehicle such as a pure electric vehicle, a hybrid electric vehicle, or a fuel cell electric vehicle is called a motor-driven vehicle. This is because the eco-friendly vehicle employs an electric motor as a driving source for driving the vehicle. Among such vehicles, the hybrid electric vehicle includes both an internal combustion engine and a motor, and is thus required to detect rotation angles of the internal combustion engine and the motor for each drive control. In this case, to detect an absolute angular position of a rotor of the motor, a resolver is used as a position sensor. The resolver may be used as the position sensor for a drive motor in the field of requiring high performance and high precision drive like an electric vehicle because it has higher mechanical strength and durability than an encoder. In the case of the internal combustion engine, if the rotation angle is not detected, it is impossible to measure the position (e.g., top dead center) of the crankshaft. Thus, a problem arises in that the fuel injection amount, injection timing, and ignition timing of the engine are not accurately identified. In this regard, a technology has been devised to replace a crank angle sensor of the engine by the resolver of the motor to generate virtual crank-angle sensor information and control the engine based on the virtual crank-angle sensor information. However, there is a disadvantage in that this conventional technology is not applicable to most motors with multiple pole-pairs because mechanical matching between resolver signals and the positions of multiple crank angles is not taken into account. Further, because the position of a 4-stroke engine has a rotation angle ranging from 0 to 720 degrees, there are disadvantages in converting the mechanical angle of the resolver to the crank angle of the internal combustion engine. Additionally, the signal delay that occurs when information is exchanged between control units through controller area network (CAN) communication is not considered. SUMMARY Accordingly, in this field of technology, it is desirable to apply solutions to motors with a large number of pole-pairs. Additionally, it is desirable to accurately measure the angular position of the internal combustion engine in consideration of the conversion of the mechanical angle into the crank angle and the signal delay in the CAN communication. The present disclosure is proposed to solve the foregoing problems. Aspects of the present disclosure are to provide a hybrid electric vehicle and an engine angular-position estimating method thereof, which are applicable to a motor with a large number of pole-pairs. Other aspects of the present disclosure are to provide a hybrid electric vehicle and an engine angular-position estimating method thereof, in which conversion of a resolver mechanical angle into an engine crank angle and a signal delay that occurs when information is exchanged between control units through controller area network (CAN) communication are taken into account. Still another aspect of the present disclosure is to provide a hybrid electric vehicle in which an angular position of an engine is accurately estimated and a motor compensates the engine for the torque precisely based on the estimated angular position of the engine. Technical problems to be solved in the present disclosure are not limited to the aforementioned technical problems. Other unmentioned technical problems can be more clearly understood from the following description by a person having ordinary knowledge in the art to which the present disclosure pertains. According to an embodiment of the present disclosure, a vibration control method of a hybrid electric vehicle is provided. The method includes receiving rotor angle information of a motor of the vehicle generated based on information detected by a resolver and includes receiving first engine rotation-angle information generated based on information detected by a cam angle sensor or a crank angle sensor. The method further includes generating engine rotation-angle candidates based on the rotor angle information and identifying a second engine rotation-angle based on the engine rotation-angle candidates and the first engine rotation-angle information. In this case, the number of engine rotation-angle candidates may be based on the number of poles of a motor rotor magnet of the hybrid electric vehicle. In this case, identifying the second engine rotatio