Abstract: Disclosed are apparatuses and methods for controlling driving of a hybrid vehicle. A method may include calculating a rate-of-change of a motor rpm, calculating a second reference rpm depending on the calculated rate-of-change of the motor rpm by varying a first reference rpm that has been set to engage an engine clutch, where the second reference rpm is newly set to engage the engine clutch, and controlling a vehicle drive mode by determining whether to start an engine and engage the engine clutch according to whether the motor rpm reaches the second reference rpm.

Abstract: Disclosed herein is a method and system for charging a battery of a hybrid electric vehicle driven with power of an engine and/or a motor, the method including detecting an accelerator pedal position by an accelerator position detector, detecting a brake pedal position by a brake position detector, determining, by a controller, when the vehicle is coasting based on manipulation of the accelerator pedal and the brake pedal; determining when a state of charge of the battery is a charged state having a value equal to or smaller than a set value; and maintaining the engine in a driving state and rotating the driving motor with engine power to charge the battery with generated power of the driving motor when the state of charge of the battery is the charged state having the value equal to or smaller than the set value and the hybrid electric vehicle is coasting.

Abstract: A method of displaying a driver's propensity includes: determining a current drive mode, at a plurality of predetermined times, of a vehicle that is in operation, each determined current drive mode being selected from a plurality of predetermined drive modes; calculating cumulative ratios of each determined current drive mode by accumulating in real-time ratios of the current drive mode determined at each of the plurality of predetermined times; and simultaneously displaying the cumulative ratios of each determined current drive mode and the predetermined drive modes to inform the driver of the cumulative ratios.

Abstract: Provided is a method and a system for controlling engine start of a hybrid vehicle based on acceleration demanded power of a driver. More specifically, a variance of an output signal of an accelerator pedal sensor (APS) senses manipulation of an accelerator pedal reflecting an acceleration demand of a driver. When the variance of the output signal of the accelerator pedal sensor is a positive threshold value, acceleration demanded power corresponding to the output signal of the accelerator pedal sensor is calculated in a section in which the variance is positive and the calculated acceleration demanded power is accumulated. The accumulated acceleration demanded power is then compared with a set power value, and the engine is started to switch from the EV mode to the HEV mode when the accumulated acceleration demanded power is equal to or greater than the set power value.

Abstract: A method of improving fuel economy through electrical vehicle (EV) control of a hybrid vehicle having various modes includes applying an APS input by releasing a brake, identifying whether a second clutch is released when an input split mode command is applied from a first control unit, determining whether the second clutch is released, generating a target revolutions per minute (RPM) of an engine, comparing the target RPM of the engine with an actual RPM of the engine to generate a first motor torque in response to a difference therebetween through feedback control and feedforward control, applying an injection signal when the RPM of the engine is increased, applying an engine torque according to an engine torque restriction amount of the first control unit to complete a vehicle starting condition, and recognizing completion of vehicle starting when engine torque restriction requirement does not exist.

Abstract: A driving control method for a hybrid vehicle has state of charge (SOC) ranges including a high SOC range, an intermediate SOC range and a low SOC range, and a plurality of power distribution strategies corresponding to the respective SOC ranges. The driving control method controls the hybrid vehicle using a power distribution strategy corresponding to an SOC range to which a current SOC of the hybrid vehicle belongs. When a speed of the hybrid vehicle is high or low and is outside a predetermined range, boundary values of the intermediate SOC range and the low SOC range among the SOC ranges are increased.

Abstract: A system and method for controlling a driving mode of a hybrid vehicle are provided. The method includes setting, by a controller, an engine-on control level based on an SOC (state of charge) of a battery and calculating a compensation factor based on a speed of the vehicle and a road gradient. The controller is configured to reflect the compensation factor in the engine-on control level and calculate a compensated engine-on control level. In addition, the method includes comparing, by the controller, a driver expectation power to the compensated engine-on control level and starting the engine when the driver expectation power is greater than the compensated engine-on control level.

Abstract: Disclosed is an engine starting control method for a hybrid vehicle that includes a starting motor for starting an engine and a driving motor for driving a vehicle. More specifically, a control unit may be configured to accelerate a stopped engine, determine whether a current speed of the engine is greater than a predetermined value, inject fuel to the engine when the current speed of the engine is greater than the predetermined value, determine a torque of the starting motor based on a target speed of the engine, and control a speed of the engine based on the determined torque of the starting motor.

Abstract: The present invention relates to a system and a method for measuring an inclination of a vehicle using an acceleration sensor, which may improve response performance of inclination measurement by adjusting to a driving state of the vehicle. The system includes: a high pass filter configured to high pass filter an output signal of the acceleration sensor that senses a driving acceleration of a vehicle; and a controller configured to deduct the output signal of the acceleration sensor filtered by the high pass filter from an original output signal of the acceleration sensor, calculate a deducted output signal of the acceleration sensor of a predetermined cutoff frequency or lower; and calculate an inclination based on the deducted output signal of the cutoff frequency or lower of the acceleration sensor.

Abstract: The present invention relates to a method and system for controlling charging of a battery supplying power to a hybrid electric vehicle according to a driving state. The method includes: detecting, by a sensor, a speed of the vehicle, generating, by a generator, power according to a driving state of the vehicle; controlling, by a controller, a charge to the battery using generated power of the power generator based on a signal of the vehicle speed detector; calculating, by the controller, an average vehicle speed for a set time; updating, by the controller, the average vehicle speed at an update period shorter than the set time; changing a state of charge (SOC) charging band, a charging reference of the battery, based on the average vehicle speed; and determining, by the controller whether to charge the battery according to a driving state based on the SOC charging band.

Abstract: Provided is a method and a system for controlling engine start of a hybrid vehicle based on acceleration demanded power of a driver. More specifically, a variance of an output signal of an accelerator pedal sensor (APS) senses manipulation of an accelerator pedal reflecting an acceleration demand of a driver. When the variance of the output signal of the accelerator pedal sensor is a positive threshold value, acceleration demanded power corresponding to the output signal of the accelerator pedal sensor is calculated in a section in which the variance is positive and the calculated acceleration demanded power is accumulated. The accumulated acceleration demanded power is then compared with a set power value, and the engine is started to switch from the EV mode to the HEV mode when the accumulated acceleration demanded power is equal to or greater than the set power value.

Abstract: Disclosed herein is a method and system for charging a battery of a hybrid electric vehicle driven with power of an engine and/or a motor, the method including detecting an accelerator pedal position by an accelerator position detector, detecting a brake pedal position by a brake position detector, determining, by a controller, when the vehicle is coasting based on manipulation of the accelerator pedal and the brake pedal; determining when a state of charge of the battery is a charged state having a value equal to or smaller than a set value; and maintaining the engine in a driving state and rotating the driving motor with engine power to charge the battery with generated power of the driving motor when the state of charge of the battery is the charged state having the value equal to or smaller than the set value and the hybrid electric vehicle is coasting.

Abstract: The present invention relates to a method and system for controlling charging of a battery supplying power to a hybrid electric vehicle according to a driving state. The method includes: detecting, by a sensor, a speed of the vehicle, generating, by a generator, power according to a driving state of the vehicle; controlling, by a controller, a charge to the battery using generated power of the power generator based on a signal of the vehicle speed detector; calculating, by the controller, an average vehicle speed for a set time; updating, by the controller, the average vehicle speed at an update period shorter than the set time; changing a state of charge (SOC) charging band, a charging reference of the battery, based on the average vehicle speed; and determining, by the controller whether to charge the battery according to a driving state based on the SOC charging band.

Abstract: The present invention relates to a system and a method for measuring an inclination of a vehicle using an acceleration sensor, which may improve response performance of inclination measurement by adjusting to a driving state of the vehicle. The system includes: a high pass filter configured to high pass filter an output signal of the acceleration sensor that senses a driving acceleration of a vehicle; and a controller configured to deduct the output signal of the acceleration sensor filtered by the high pass filter from an original output signal of the acceleration sensor, calculate a deducted output signal of the acceleration sensor of a predetermined cutoff frequency or lower; and calculate an inclination based on the deducted output signal of the cutoff frequency or lower of the acceleration sensor.

Abstract: Disclosed herein is a method and system for measuring a tilt angle while a vehicle is turning according to a lateral acceleration and a yaw rate occurring while a vehicle is turning, the method including calculating, by a controller, a traveling acceleration based on a vehicle speed detected by a vehicle speed sensor; detecting a longitudinal acceleration of a vehicle by a longitudinal acceleration sensor; calculating a first tilt angle of the road based on the traveling acceleration and the longitudinal acceleration; detecting a yaw rate of the vehicle by a yaw rate sensor; determining when a value of the detected yaw rate is equal to or greater than a predetermined value; and calculating a second tilt angle to apply a compensation value to the first tilt angle in response to detecting the yaw rate equal to or greater than a predetermined value.

Abstract: A method of improving fuel economy through electrical vehicle (EV) control of a hybrid vehicle having various modes includes applying an APS input by releasing a brake, identifying whether a second clutch is released when an input split mode command is applied from a first control unit, determining whether the second clutch is released, generating a target revolutions per minute (RPM) of an engine, comparing the target RPM of the engine with an actual RPM of the engine to generate a first motor torque in response to a difference therebetween through feedback control and feedforward control, applying an injection signal when the RPM of the engine is increased, applying an engine torque according to an engine torque restriction amount of the first control unit to complete a vehicle starting condition, and recognizing completion of vehicle starting when engine torque restriction requirement does not exist.

Abstract: Disclosed is a system and method for controlling an engine of a hybrid vehicle that continuously detects an output required power with the engine of the hybrid vehicle in an Off state, and determines whether the required power exceeds a preset engine delayed ignition power. Then a determination is made as to whether the required power exceeds a preset engine non-delayed ignition power; and when the required power exceeds the engine non-delayed ignition power within a first set time starting the engine, after the required power exceeds the engine delayed ignition power, so that the fuel efficiency and the output efficiency of a hybrid vehicle according to the present invention may be improved.

Abstract: Disclosed is an engine starting control method for a hybrid vehicle that includes a starting motor for starting an engine and a driving motor for driving a vehicle. More specifically, a control unit may be configured to accelerate a stopped engine, determine whether a current speed of the engine is greater than a predetermined value, inject fuel to the engine when the current speed of the engine is greater than the predetermined value, determine a torque of the starting motor based on a target speed of the engine, and control a speed of the engine based on the determined torque of the starting motor.

Abstract: A method for controlling an idle stop mode in a hybrid electric vehicle is disclosed. The control method accords an oil pressure drain time that a continuously variable transmission clutch oil pressure is fully drained, a final off time of an engine, and a final control time of a motor when a hybrid electric vehicle enters an idle stop mode, thereby preventing a shock or shaking of the vehicle.

Abstract: A method of controlling electric power generation during idle charge in a hybrid electric vehicle. The method includes determining whether an idle charge condition is satisfied; if the idle charge condition is satisfied, calculating a first charge power amount based on whether a load is applied, a gear shift position, and a state of charge of a battery; calculating a target charge speed based on the first charge power amount; calculating an altitude correction coefficient based on atmospheric pressure; calculating a second charge power amount based on the altitude correction coefficient and the first charge power amount; and controlling an amount of power generation and an amount of battery charge based on the second charge power amount.