Abstract: A method for monitoring a torque in a hybrid electric vehicle includes calculating an output torque of a motor based on a discharging power of a high voltage battery, a consumption power of a plurality of electric loads, and a motor speed. A first difference value between a motor torque command and the calculated output torque of the motor is calculated. The first difference value is compared with a first reference value. When the first difference value is larger than the first reference value, the hybrid electric vehicle is entered in a fail safe mode.

Abstract: A transmission system for a four wheel drive hybrid electric vehicle includes: an input shaft selectively connected to a front wheel transmission housing while being connected to an output shaft of an engine; a first motor/generator having disposed in the front wheel transmission housing; a second motor/generator having a function of the motor and the generator and connected to a rear wheel output gear disposed in a rear wheel transmission housing; a planetary gear set on the input shaft and including three rotating elements, in which among three rotating elements, a first rotating element is directly connected to the first motor/generator and selectively connected to the input shaft, a second rotating element is directly connected to the input shaft, and a third rotating element is selectively connected to a front wheel output gear; and a connection unit disposed at a selective connection part.

Abstract: A transmission system for a hybrid electric vehicle includes an input shaft connected to an output side of an engine, first and second motors/generators having a function of a motor and a generator and disposed in a transmission housing, a planetary gear set disposed on the input shaft and including three rotating elements, in which among three rotating elements, a first rotating element is directly connected to the first motor/generator and selectively connected to the input shaft and the transmission housing, a second rotating element is directly connected to the input shaft, and a third rotating element is connected to an output gear and connected to the second motor/generator, and a connection unit disposed at the selective connection part.

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: Disclosed herein is a method and system for measuring a tilt angle including detecting acceleration of a vehicle through an acceleration sensor; detecting a vehicle speed through a vehicle speed sensor; detecting a position of a shift lever through a shift lever position detector; detecting, by a controller, a rotation direction of a wheel; detecting, by the controller, a rotation direction of a motor; receiving, by the controller, a plurality of input signals; inverting, by the controller, a value of the vehicle speed to a negative number based on the detected position of the shift lever, the rotation direction of the wheel, and the rotation direction of the motor; calculating, by the controller, traveling acceleration based on the vehicle speed or the inverted vehicle speed; and calculating, by the controller tilt angle of the road based on the traveling acceleration and the sensor acceleration.

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.