Abstract: A cooling system of a hybrid electric vehicle (HEV) includes an engine cooling circuit that cools cooling water using an engine heat exchanger and circulates the cooled cooling water using an engine water pump to cool an engine. An HEV cooling circuit cools cooling water using an HEV heat exchanger and circulates the cooled cooling water using an HEV water pump to cool an inverter and a motor. A connection part connects the engine cooling circuit to the HEV cooling circuit.

Abstract: A hybrid electric vehicle (HEV) cooling system includes an engine cooling circuit configured to cool an engine by circulation of coolant cooled by an engine heat exchanger using an engine water pump. An engine reservoir tank is configured to temporarily store the coolant cooled by the engine heat exchanger and replenish insufficient coolant. An HEV cooling circuit is configured to cool an inverter and motor by circulation of coolant cooled by an HEV heat exchanger using an HEV water pump. An HEV reservoir tank is configured to temporarily store the coolant cooled by the HEV heat exchanger and replenish insufficient coolant. A connector (30) configured to intermittently connect the engine cooling circuit to the HEV cooling circuit. An engine coolant amount detection sensor and an HEV coolant amount detection sensor are respectively configured to detect amounts of the coolant stored in the engine and HEV reservoir tanks.

Abstract: A HEV cooling system includes an engine cooling circuit configured to cool an engine by circulation of coolant cooled by an engine heat exchanger using an engine water pump. An engine reservoir tank is configured to temporarily store the coolant cooled by the engine heat exchanger and replenish insufficient coolant. A HEV cooling circuit is configured to cool an inverter and motor by circulation of coolant cooled by an HEV heat exchanger using an HEV water pump. An HEV reservoir tank is configured to temporarily store the coolant cooled by the HEV heat exchanger and replenish insufficient coolant. A connector (30) configured to intermittently connect the engine cooling circuit to the HEV cooling circuit. An engine coolant amount detection sensor and an HEV coolant amount detection sensor are respectively configured to detect amounts of the coolant stored in the engine and HEV reservoir tanks.

Abstract: A cooling system of a hybrid electric vehicle (HEV) includes an engine cooling circuit that cools cooling water using an engine heat exchanger and circulates the cooled cooling water using an engine water pump to cool an engine. An HEV cooling circuit cools cooling water using an HEV heat exchanger and circulates the cooled cooling water using an HEV water pump to cool an inverter and a motor. A connection part connects the engine cooling circuit to the HEV cooling circuit.

Abstract: Disclosed herein is an over-current damage prevention method and apparatus for a subsidiary inverter of an electric bus, which may reduce surge current generated due to a substantially abrupt occurrence of a load when a clutch is connected thereon by reducing the speed of a power steering motor before the clutch is connected thereon. The method and apparatus include sensing, by a sensor, a pressure of an air tank and an on position of an air pressure; reducing, by an inverter, a speed of a power steering motor by controlling the voltage applied to the power steering motor when the pressure of the air tank is less than a setup value or when the air pressure switch is on; and in response to reducing the speed of the power steering motor, maintaining a clutch in an engaged position to transmit power from the power steering motor to an air compressor.

Abstract: Disclosed herein is an over-current damage prevention method and apparatus for a subsidiary inverter of an electric bus, which may reduce surge current generated due to a substantially abrupt occurrence of a load when a clutch is connected thereon by reducing the speed of a power steering motor before the clutch is connected thereon. The method and apparatus include sensing, by a sensor, a pressure of an air tank and an on position of an air pressure; reducing, by an inverter, a speed of a power steering motor by controlling the voltage applied to the power steering motor when the pressure of the air tank is less than a setup value or when the air pressure switch is on; and in response to reducing the speed of the power steering motor, maintaining a clutch in an engaged position to transmit power from the power steering motor to an air compressor.

Abstract: There is provided an alternating current (AC) detection circuit for power supply, the AC circuit including: a rectifying part rectifying an AC voltage; a voltage division part dividing the voltage rectified by the rectifying part according to a preset division ratio; a voltage stabilization circuit part stabilizing the voltage divided by the voltage division part; and a first square wave generating part comparing the voltage stabilized by the voltage stabilization circuit part with an internal reference voltage, and generating a first square wave signal having a duty ratio according to comparison results between the stabilized voltage and the internal reference.

Abstract: There is provided an alternating current (AC) detection circuit for a power supply, the circuit including: a rectifying part rectifying an AC voltage; a voltage division part dividing the voltage rectified by the rectifying part according to a preset division ratio; a voltage stabilization circuit part stabilizing the voltage divided by the voltage division part; a comparing part comparing the voltage stabilized by the voltage stabilization circuit part with an internal reference voltage and generating an input detection signal when the stabilized voltage is higher than the internal reference voltage; and an output part outputting an AC detection signal when the input detection signal is inputted from the comparing part.

Abstract: Disclosed is a hill start assist control (HAC) system and method for use in a hybrid electric vehicle incorporating an EHS which includes a hybrid control unit that is configured to determine the operational state of the EHS when the hybrid electric vehicle is stopped and is being restarted on a slope, and controls the operation state of the EHS to be released when it is determined by the controller that the EHS should be operated.

Abstract: There is provided an alternating current (AC) detection circuit for power supply, the AC circuit including: a rectifying part rectifying an AC voltage; a voltage division part dividing the voltage rectified by the rectifying part according to a preset division ratio; a voltage stabilization circuit part stabilizing the voltage divided by the voltage division part; and a first square wave generating part comparing the voltage stabilized by the voltage stabilization circuit part with an internal reference voltage, and generating a first square wave signal having a duty ratio according to comparison results between the stabilized voltage and the internal reference

Abstract: There is provided an alternating current (AC) detection circuit for a power supply, the circuit including: a rectifying part rectifying an AC voltage; a voltage division part dividing the voltage rectified by the rectifying part according to a preset division ratio; a voltage stabilization circuit part stabilizing the voltage divided by the voltage division part; a comparing part comparing the voltage stabilized by the voltage stabilization circuit part with an internal reference voltage and generating an input detection signal when the stabilized voltage is higher than the internal reference voltage; and an output part outputting an AC detection signal when the input detection signal is inputted from the comparing part.