Patent application number | Description | Published |
20090153087 | Method for controlling motor torque in hybrid electric vehicle - The present invention provides a method for controlling motor torque in a hybrid electric vehicle, which can reduce current control mapping time and simplify control algorithm by providing a torque control compensation logic against a change in temperature of a motor (interior permanent magnet synchronous motor) of the hybrid electric vehicle. The present method includes: forming a single current control map based on an engine room temperature; determining a motor operation range that requires temperature compensation according to motor load conditions such as speed and torque; obtaining an optimization formula for torque command compensation; determining a torque command compensation value using the optimization formula; generating a new torque command with the torque command compensation value and applying the new torque command to the single current control map; and applying to a motor a current for which a torque variation according to a temperature change is compensated. | 06-18-2009 |
20120139459 | SYSTEM FOR CONTROLLING MOTOR OF HYBRID VEHICLE - A system for controlling a motor of a hybrid vehicle that secures robustness and stability of control by selecting an optimal approximation model according to a driving condition of the motor and determines current order for controlling the motor by using the selected optimal approximation model is disclosed. In particular, a current order generator utilizes a reference current determination module to determine reference currents of the first and second axes, a compensation value determination module to determine compensation values of the reference currents of the first and second axes, and a current determination module to determine the currents of the first and second axes from the reference currents of the first and second axes and the compensation values of the reference currents of the first and second axes in order to control the motor more efficiently. | 06-07-2012 |
20130147431 | RECHARGE SYSTEMS AND METHODS - A charging device according to an exemplary embodiment of the present invention may include: a battery adapted and configured to store a DC voltage, first and second motors adapted and configured to operate as a motor or a generator, first and second inverters adapted and configured to operate the first and second motors, a voltage transformer adapted and configured to boost the DC voltage of the battery to supply it to the first and second inverters and boosts the DC voltage of the inverter to supply it to the battery, and a charging controller adapted and configured to operate the first and second inverters as a booster or operate the voltage transformer as a buck booster according to a voltage that is input through a neutral point of the first and second motors and the voltage of the battery. | 06-13-2013 |
20140167669 | OFFSET COMPENSATION METHOD OF CURRENT SENSOR AND MOTOR DRIVING SYSTEM - An offset compensation method of a current sensor is provided for determining whether an offset compensation of the current sensor is abnormal, and a motor driving system includes the current sensor. The offset compensation method includes: compensating for an offset of the current sensor, and determining whether the offset compensation of the current sensor is abnormal. | 06-19-2014 |
20140183941 | FAIL-SAFE METHOD AND APPARATUS FOR HIGH VOLTAGE PARTS IN A HYBRID VEHICLE - A fail-safe method and apparatus for high voltage parts in a hybrid vehicle is provided. In the fail-safe method, it is determined whether or not a high voltage main relay is turned off. Here, when the high voltage main relay is turned off, a voltage is charged into a direct current (DC) link using a counter electromotive force generated in a motor generator linked with a revolution of an engine. Voltage control is performed such that the voltage of the DC link is uniformly maintained using an inverter for the motor generator. | 07-03-2014 |
20140375239 | MOTOR CONTROL SYSTEM AND METHOD FOR ENVIRONMENTALLY-FRIENDLY VEHICLE - A motor control system and method are provided for a vehicle that reduces torque ripples due to motor system characteristics while the vehicle is running at ultra-low speed in an electric vehicle running mode. The system includes a current command generator that generates a current command based on a torque command, a motor speed, and a reference voltage. A current controller generates a voltage command based on the current command. A coordinate transformer transforms the voltage command into a 3-phase voltage command by a coordinate transformation and a PWM (pulse width modulation) signal generator generates a switch signal based on the 3-phase voltage command. A PWM inverter generates a 3-phase driving current to drive a motor based on the switch signal and a current control ripple compensator applies a reverse phase harmonic wave to the current controller to reduce a harmonic wave caused by errors generated from the current controller. | 12-25-2014 |
20150175015 | CONTROL METHOD AND SYSTEM OF ELECTRIC VEHICLE - A control method of electric vehicle according to an exemplary embodiment of the present invention may include a battery supplying electricity, a motor receiving electricity from the battery and generating power, and a controller controlling the battery and the motor, wherein the controller executes instructions for: detecting a torque command, a motor speed, and a motor current; calculating a motor voltage from the motor current; determining whether voltage utilization according to a speed range of the motor is higher than a predetermined value; generating an operating point correcting function according to the motor speed when the voltage utilization is not higher than the predetermined value; calculating a current command according to the motor speed from the operating point correcting function; and outputting the calculated current command. | 06-25-2015 |