Hybrid electric vehicle and method of controlling engine speed for the same
AssigneesHyundai Motor Company, Kia Corporation
InventorsSeo Ho Lee, Hyun Jin Park, Jae Young Choi, Kwon Chae Chung
Life of this patent
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Abstract
Disclosed are a hybrid electric vehicle and a method for controlling an engine speed of a hybrid electric vehicle. In particular, the method includes: determining, when an engine on one end and a first motor are directly connected and while driving in a state where an engine clutch is connected and a second motor is connected to the other end, a compensation value based on the difference in the rotational speed of the engine and the second motor when a control entry is caused, which induces the rotational speed mismatch of the engine and the second motor; and compensating an output torque of the first motor based on the compensation value.
Claims13
A method for controlling an engine speed of a hybrid electric vehicle, the method comprising:
- determining, when a first end of an engine is directly connected to a first motor while driving in a state where an engine clutch is locked-up and when a second motor is connected to a second end of the engine, a compensation value based on a difference in rotational speed of the engine and the second motor when a cause of control entry is occurred, which induces the rotational speed mismatch of the engine and the second motor;
- compensating an output torque of the first motor based on the compensation value,
- wherein the cause of control entry comprises a request to start a fuel injection,
- wherein determining the compensation value further comprises:
- storing, when the difference in rotational speed exceeds a second reference value greater than a predetermined first reference value during an initial engine speed control for each of the causes of control entry, the torque of the first motor such that the difference in rotational speed is less than or equal to the first reference value;
- and
- determining the stored torque as the compensation value;
- and
- terminating an output torque compensation of the first motor when a locked-up state of the engine clutch is opened.
A non-transitory computer-readable recording medium having a program recorded thereon, the program to direct a processor to perform acts of:
- determining, when a first end of an engine is directly connected to a first motor while driving in a state where an engine clutch is locked-up and when a second motor is connected to a second end of the engine, a compensation value based on a difference in rotational speed of the engine and the second motor when a cause of control entry is occurred, which induces the rotational speed mismatch of the engine and the second motor;
- compensating an output torque of the first motor based on the compensation value,
- wherein the cause of control entry comprises a request to start a fuel injection,
- wherein determining the compensation value further comprises:
- storing, when the difference in rotational speed exceeds a second reference value greater than a predetermined first reference value during an initial engine speed control for each of the causes of control entry, the torque of the first motor such that the difference in rotational speed is less than or equal to the first reference value;
- and
- determining the stored torque as the compensation value;
- and
- terminating an output torque compensation of the first motor when a locked-up state of the engine clutch is opened.
A hybrid electric vehicle comprising:
- an engine clutch, of which a first motor directly connected to an engine at a first end and a second motor connected to a second end;
- and
- a control unit configured to determine, in a state where the engine clutch is locked-up, a compensation value based on a difference in a rotational speed between the engine and the second motor when a cause of control entry is occurred, which induces a rotational speed mismatch of the engine and the second motor and compensating an output torque of the first motor based on the compensation value,
- wherein the cause of control entry comprises a request to start a fuel injection, and
- wherein the control unit is further configured to:
- store, when the difference in rotational speed exceeds a second reference value greater than a predetermined first reference value during an initial engine speed control for each of the causes of control entry, the torque of the first motor such that the difference in rotational speed is less than or equal to the first reference value;
- and
- determine the stored torque as the compensation value;
- and
- terminate an output torque compensation of the first motor when a locked-up state of the engine clutch is opened.
Dependencies are inferred from the claim text.