Emergency operating system and method for hybrid vehicle with damaged bearing of engine

Patent metadata

Field	Value
Publication number	US-2025242796-A1
Application number	US-202519185387-A
Country	US
Kind code	A1
Filing date	Apr 22, 2025
Priority date	Jun 3, 2021
Publication date	Jul 31, 2025
Grant date	—

Abstract

Disclosed herein are an emergency operating system and an emergency operating method for a hybrid vehicle with a damaged bearing of an engine, which are capable of preventing a bearing from being further damaged due to a drive motor and a hybrid starter and generator (HSG) when damage to the bearing installed in an engine is detected and capable of driving the hybrid vehicle and which include a bearing damage detection operation, an engine driving maintaining operation, a first state of charge (SOC) comparison operation, and a first emergency operating operation.

First claim

What is claimed is:

1 . An emergency operating system for a hybrid vehicle, the emergency operating system comprising:
an engine; a drive motor selectively connected to the engine by a clutch; a hybrid starter and generator (HSG) configured to start the engine or configured to be operated by the engine to generate electric power; and a controller configured to control driving of the hybrid vehicle, wherein, in the emergency operating system of the hybrid vehicle, which controls the hybrid vehicle to be driven even when the bearing installed in the engine is damaged, when a damage to the bearing is detected, the controller maintains driving of the engine in a preset limp-home mode, compares whether a state of charge (SOC) of a high voltage battery is greater than or equal to a first reference value which is preset to drive the hybrid vehicle using the engine, and stops driving of the drive motor and the HSG when the SOC is greater than or equal to the first reference value to control the hybrid vehicle in a first emergency operating mode in which the hybrid vehicle is driven using only a driving force of the engine, wherein, after the first emergency operating mode is performed, the controller compares whether the SOC is lower than or equal to a second reference value which is preset as the need for charging the high voltage battery, and when the SOC is lower than or equal to the second reference value, the controller controls the hybrid vehicle in a second emergency operating mode in which the clutch is separated, the engine is operated to allow the HSG to generate the electric power, and the hybrid vehicle is driven by the drive motor.

2 . The emergency operating system of claim 1 , wherein, while controlling the hybrid vehicle in the first emergency operating mode, when a current state is any one state among a state in which a gear shift stage of a transmission is a P stage, a state in which the gear shift stage of the transmission is an N stage, and a state in which the hybrid vehicle stops, the controller controls the HSG to generate electric power.

3 . The emergency operating system of claim 1 , wherein, when the SOC is not greater than or equal to the first reference value, the controller controls the hybrid vehicle in a second emergency operating mode in which the clutch is separated, the engine operates the HSG to generate the electric power, and the hybrid vehicle is driven by the drive motor.

4 . The emergency operating system of claim 1 , wherein, when the SOC is not lower than or equal to the second reference value, the controller controls the hybrid vehicle in the first emergency operating mode.

5 . The emergency operating system of claim 1 , wherein the controller controls the engine to be operated at an output that is lower than a maximum output in the limp-home mode and controls the engine to operate the HSG to generate the electric power.

6 . The emergency operating system of claim 1 , wherein, after controlling the hybrid vehicle in the second emergency operating mode, the controller compares whether the SOC is greater than or equal to a third reference value which is preset to drive the hybrid vehicle using the drive motor then drive the hybrid vehicle again using the engine, and when the SOC is greater than or equal to the third reference value, the controller controls to execute the first emergency operating mode again.

7 . The emergency operating system of claim 6 , wherein, when the SOC is not greater than or equal to the third reference value, the controller controls to execute the second emergency operating mode.

8 . The emergency operating system of claim 6 , wherein the third reference value is set to be greater than the first reference value.

9 . The emergency operating system of claim 1 , wherein the controller monitors the SOC and controls the engine, the drive motor, and the HSG according to the SOC.

10 . The emergency operating system of claim 1 , wherein, when the engine is stopped due to the damage to the bearing, the controller controls the engine to not be started.

11 . The emergency operating system of claim 12 , wherein the controller drives the drive motor to control the hybrid vehicle to travel from a current location to a safe place.

12 . The emergency operating system of claim 1 , wherein the bearing is a bearing installed between a connecting rod and a crankshaft.

13 . An emergency operating method of a hybrid vehicle for controlling the hybrid vehicle to be driven in an emergency even when a bearing installed in an engine of the hybrid vehicle is damaged, the hybrid vehicle including the engine and a drive motor, using at least one of the engine or the drive motor as a driving source, and further including a hybrid starter and generator (HSG) configured to start the engine or configured to be driven by the engine to generate electric power, the emergency operating method comprising:
a bearing damage detection operation of detecting and confirming a damage to the bearing installed in the engine; an engine driving maintaining operation of maintaining driving of the engine in a preset limp-home mode; a first state of charge (SOC) comparison operation of comparing whether an SOC of a high voltage battery is greater than or equal to a first reference value which is preset to drive the hybrid vehicle by the engine; when the SOC is greater than or equal to the first reference value, a first emergency operating operation of stopping the drive motor and the HSG and driving the hybrid vehicle using only a driving force of the engine, when the SOC is not greater than or equal to the first reference value in the first SOC comparison operation, a second emergency operating operation of separating a clutch installed between the engine and the drive motor, operating the engine to allow the HSG to generate the electric power, and operating the hybrid vehicle by the drive motor, wherein, in the second emergency operating operation, the engine is operated at an output that is lower than the maximum output in the limp-home mode to operate the HSG to generate the electric power.

14 . The emergency operating method of claim 13 , wherein, when the hybrid vehicle satisfies a predetermined condition in the first emergency operating operation, the HSG generates the electric power.

15 . The emergency operating method of claim 14 , wherein, in the first emergency operating operation, a condition in which the HSG generates the electric power is any one state among a state in which a gear shift stage of a transmission is a P stage, a state in which the gear shift stage of the transmission is an N stage, and a state in which the hybrid vehicle stops.

16 . An emergency operating method of a hybrid vehicle for controlling the hybrid vehicle to be driven in an emergency even when a bearing installed in an engine of the hybrid vehicle is damaged, the hybrid vehicle including the engine and a drive motor, using at least one of the engine or the drive motor as a driving source, and further including a hybrid starter and generator (HSG) configured to start the engine or configured to be driven by the engine to generate electric power, the emergency operating method comprising:
a bearing damage detection operation of detecting and confirming a damage to the bearing installed in the engine; an engine driving maintaining operation of maintaining driving of the engine in a preset limp-home mode; a first state of charge (SOC) comparison operation of comparing whether an SOC of a high voltage battery is greater than or equal to a first reference value which is pr

Assignees

• Hyundai Motor Co Ltd
• Kia Corp

Inventors

• Park Jun-Ho
• Nam Sung-Woo
• Kim Pan-Sang
• Jeon Byng-Mo
• Mun Sang-Hyuk
• Moon Seong-Wook
• Son Je-Ha
• Park Young-Joon
• Min Chan-Ki
• Hwang Hye-Kil
• Baek Sung-Nam
• Yu Chul-Ho
• Yoon Hyung-Mook

Classifications

• B60Y2200/92

  Hybrid vehicles · CPC title

• B60W2710/08

  Electric propulsion units · CPC title

• B60W2710/021

  Clutch engagement state · CPC title

• B60W2520/04

  Vehicle stop · CPC title

• B60W2510/1005

  Transmission ratio engaged · CPC title