Hyundai Motor Company

Kia Motors Corporation

Jin Kuk Cho

Ji Hyun Park

Kum Lim Choi

Moon Kyung Joo

A control method for controlling gear-shifting and lock-up of an engine clutch in a hybrid vehicle includes: detecting a kickdown shift by a driver while the hybrid vehicle is driving in an electric vehicle mode; starting gear-shifting when the kickdown shift is detected; controlling a difference between an engine speed and a motor speed to be equal to or less than a first reference value; synchronizing the engine speed and the motor speed through an engine speed control; performing torque blending by locking up the engine clutch when the synchronization is completed; and ending the gear-shifting when a target required torque is reached through the torque blending.

Method and apparatus for controlling gear-shifting and engine clutch connection in hybrid vehicle

A hybrid electric vehicle capable of starting an engine in the event of failure of a DC-DC converter and a method of controlling the hybrid electric vehicle are provided. The hybrid electric vehicle includes a driving motor, an engine, and a first relay that starts a starter. A second relay is disposed between a first power line, connected the starter and a first battery, and second power line, connects a DC-DC converter that converts the power of a second battery and an electric load. A controller selectively adjusts the states of the first relay and the second relay. Upon determining starting of the engine and detecting failure of the DC-DC converter, the controller maintains the on state of the second relay and turns on the first relay to perform cranking of the engine.

Hybrid electric vehicle and method of controlling the same

A device for controlling sudden unintended acceleration according to an embodiment of the present disclosure includes a sensor for detecting a current acceleration of a vehicle, a first controller that calculates a motor torque command value for driving a motor, calculates an expected acceleration of the vehicle based on the motor torque command value, and compares the expected acceleration with the current acceleration, and a second controller that compares the motor torque command value with a preset value. Therefore, the device may determine a cause of the sudden unintended acceleration and block the sudden unintended acceleration based on the determination result to improve safety of a driver.

Device and method for controlling sudden unintended acceleration

A launch control method for a hybrid vehicle includes: determining an intent of a driver to execute a launch control mode in a state in which an engine is turned-off; when the intent of the driver is to execute the launch control mode, starting the engine and controlling an engine speed; performing a slip control on a slip element of a transmission input terminal; when the engine speed is synchronized with a motor speed or a difference between the engine speed and the motor speed is less than a predetermined range, locking up an engine clutch; when the engine clutch is locked up, performing an engine pre-boosting control to raise an engine torque to a torque at which battery charging is available due to a motor; performing a take-up control on the slip element; and when the take-up control is terminated, locking up the slip element.

Launch control method for hybrid vehicle

A fail-safe method for a parallel hybrid electric vehicle, having a motor connected between an engine and a transmission, and an engine clutch connected between the engine and the motor, includes: operating the engine using a starter and engaging the engine clutch; switching a first gearing map, which determines a change in a gear ratio of the transmission depending on a throttle vale opening rate regulated by an accelerator pedal and a vehicle speed obtained, to a second gearing map, which allows the gear ratio to change at a higher vehicle speed than that before the motor system failure occurs; and assisting a driving power of a first battery consumed by a low voltage DC-DC converter (LDC) with a counter electromotive power of the motor generated during operating of the engine in an engaged state of the engine clutch.

Fail-safe method for parallel hybrid electric vehicle

A fail-safe control method for a hybrid electric vehicle is carried out based on a power transmission system of an engine, which is used to control the speed of the engine. When one of a plurality of motor-generators of the power transmission system malfunctions, the vehicle is controlled to be driven in a limp-home mode, thereby ensuring vehicle driving reliability and preventing the vehicle from becoming inoperable.

Fail-safe control method for hybrid electric vehicle

A control method for a vehicle may include shifting request check step of checking whether there is request for shifting in vehicle on the basis of acceleration pedal depression extent and vehicle speed by shifting control device; target engine speed determination step of determining engine target speed on basis of the vehicle speed and gear ratio of pseudo target gear stage by target engine speed determiner when request for shifting is found to have been received as the result of the shifting request check step; and engine speed control step of controlling the engine speed to follow the target engine speed by determining the engine speed control torque on the basis of the difference between the target engine speed and the current engine speed and by applying the determined engine speed control torque to the first motor generator, after the engine target speed determination step.

Control method for hybrid vehicle

A method for controlling torque intervention in a power split-parallel hybrid vehicle comprises a determination step, in which whether the torque intervention for controlling the driving force of the vehicle is requested. Upon the torque intervention request, a driver's requested torque and an intervention torque for the torque intervention are determined in a decision step. When a torque intervention request time during which torque intervention is requested is below a reference time, each of driving sources is controlled together to output the driver's requested torque plus the intervention torque as a final requested torque on the basis of a current driving mode which is maintained as a driving mode just before the torque intervention is requested.

Method for controlling torque intervention of hybrid vehicle

A control method and system for a hybrid vehicle including an engine, a first motor/generator and a second motor/generator a power sources are provided. The control method includes performing a parallel driving mode by driving with a driving power transmitted from the engine and the second motor/generator at a fixed gear ratio. Additionally, an OD brake is released from fixing a gear ratio of a planetary gear set disposed between the generator and the engine. Then an EV driving mode is performed with a driving power of the second motor/generator.

Control method and system for hybrid vehicle

An engine stop control method of a power split-parallel hybrid electric vehicle (HEV) system may include: determining any one driving mode among an EV mode, a power split mode and a parallel mode, corresponding to a driver's request; recognizing and deciding whether the driving mode is a mode required to stop an engine; stopping the engine; and performing kill torque (TQ) control on the revolution speed of the engine through a motor so that the revolution speed of the engine reaches 0 rpm. Accordingly, the revolution speed of the engine can be reduced down to an rpm lower than that of the conventional art, thereby promoting fast mode conversion.

Engine stop control method of power split-parallel HEV system

A glow plug control method of a diesel hybrid vehicle includes: determining an operation time of a glow plug based on a coolant temperature while the vehicle runs in an electric vehicle mode with an electric motor; determining whether the inside of an engine cylinder needs to be preheated based on the coolant temperature; comparing a driver-required power with a standard start power for determining whether to start a diesel engine; determining a glow plug operation time and a standard glow operation power, when the driver-required power is under the standard start power; operating the glow plug in advance, when the standard glow operation power is less than the driver-required power; and starting the diesel engine, when the driver-required power is higher than the standard start power.

Growing community of inventors

Goyang-si, South Korea

Jin Kuk Cho