Abstract: Disclosed is a silencer for fuel cell vehicles. The silencer for fuel cell vehicles includes a housing having an inlet configured to receive air and hydrogen flowing into the housing therethrough, an outlet, and a condensation water drain hole configured to discharge condensation water to the outside therethrough, a distribution plate disposed in the housing and having distribution holes to distribute air and hydrogen flowing into the housing, a rotary plate disposed in the housing closer to the outlet than the distribution plate, a motor connected to the rotary plate to rotate the rotary plate, and an anti-freezing unit extending from one end of the rotary plate to the condensation water drain hole.

Abstract: An apparatus for protecting negative pressure is provided. The apparatus includes a main flow passage that circulates coolant of a vehicle and includes a section where negative pressure is formed therein. A housing is positioned at the section where the negative pressure of the main flow passage is formed and has a communication aperture that communicates with the main flow passage therein. A negative pressure valve is disposed at the inside of the housing to open or close the communication aperture based on the relationship of an exterior pressure and a valve inside pressure to maintain the valve inside pressure above a predetermined reference value.

Abstract: Disclosed is a silencer for fuel cell vehicles. The silencer for fuel cell vehicles includes a housing having an inlet configured to receive air and hydrogen flowing into the housing therethrough, an outlet, and a condensation water drain hole configured to discharge condensation water to the outside therethrough, a distribution plate disposed in the housing and having distribution holes to distribute air and hydrogen flowing into the housing, a rotary plate disposed in the housing closer to the outlet than the distribution plate, a motor connected to the rotary plate to rotate the rotary plate, and an anti-freezing unit extending from one end of the rotary plate to the condensation water drain hole.

Abstract: A coolant bypass structure includes a main loop forming a channel in which coolant circulates; a bypass loop connected to the main loop and forming a selective bypass channel; and a stack bypass valve provided between the main loop and the bypass loop to open and close the bypass loop according to a predetermined temperature, and provided with an outlet temperature sensor. The coolant bypass structure may improve marketability by decreasing the starting time of the fuel cell vehicle in a frozen state and improve power efficiency.

Abstract: An air supply device using a cooling water heater of a fuel cell vehicle can effectively reduce cold starting time of the fuel cell vehicle and effectively remove moisture in a stack in cold shut down (CSD) of the fuel cell vehicle. In the air supply device, a bypass flow path is formed to be branched from a first air supply line connected between an air blower for supplying air to a fuel cell stack and a humidifier for humidifying the air supplied to the stack. The bypass flow path allows air exhausted from the air blower to pass through a cooling water heater by bypassing the humidifier and then to be supplied to the stack.

Abstract: A non-negative pressure radiator cap is provided and includes a pressure valve having a pressure member, disposed inside a body while having an aperture formed therein. The pressure member is pressed based on an increase in pressure of coolant to move coolant toward a reservoir tank. Additionally, a vacuum valve that includes a head part and a neck part moves vertically based on the pressure of the coolant to open or close the aperture. The neck part passes through the aperture from bottom to top. A sealing member is disposed between the pressure valve and the vacuum valve and has an insertion aperture that is formed at a position corresponding to the aperture of the pressure valve. A retainer is further inserted into the aperture and the insertion hole and a guide directs the vacuum valve to move vertically when the vacuum valve is opened or closed.

Abstract: A cooling system of a vehicle having a fuel cell stack includes a pump for circulating a coolant in a coolant line passing through the fuel cell stack, a heater disposed on the coolant line for heating the coolant by electric power supplied by a drive motor of the vehicle, and a controller for operating the heater by a surplus electric power generated by the drive motor when a heat generation amount of the fuel cell stack is less than a first threshold value and a rotation speed of the pump is above a second threshold value, and for turning off the heater when the heat generation amount of the fuel cell stack is less than the first threshold value and the rotation speed of the pump is less than the second threshold value.

Abstract: A thermal management system of a fuel cell vehicle includes a cold start loop which heats a coolant that flows through a fuel cell during a cold start of the fuel cell, and a cooling loop which moves a coolant that cools the fuel cell.

Abstract: A device for preventing over pressure of a cooling system of a fuel cell system is provided. The device detects a change in a temperature of a coolant discharged from a fuel cell stack and prevents over pressure of the cooling system before pressure of the coolant is elevated by the increase in the temperature. In particular, a coolant pump circulates a coolant to a fuel cell stack, a radiator radiates heat absorbed in the coolant, and a temperature sensor detects a temperature of the coolant discharged from the fuel cell stack the device. The system further includes an electronic valve mounted in a pillar neck of the radiator connected with a reservoir for supplementing a coolant to open and close the pillar neck and a fuel cell controller that operates the electronic valve based on a signal of the temperature sensor.

Abstract: A cooling system for a vehicle is provided. The system includes a valve that is disposed at a predetermined position in a cooling channel to discharge bubbles produced in a coolant out of the cooling channel. Additionally, a controller is configured to detect whether bubbles have been produced in the coolant using a rate of pressure change based on a temperature increase in the cooling channel and open the valve in response to detecting that bubbles have been produced.

Abstract: A cooling system for a vehicle is provided. The system includes a valve that is disposed at a predetermined position in a cooling channel to discharge bubbles produced in a coolant out of the cooling channel. Additionally, a controller is configured to detect whether bubbles have been produced in the coolant using a rate of pressure change based on a temperature increase in the cooling channel and open the valve in response to detecting that bubbles have been produced.

Abstract: A flow control baffle apparatus for a vehicle heater is provided. The flow control baffle apparatus implements a flow control function of a fluid passing through the interior of a heater and improves the heat transfer performance of the heater. The flow control baffle apparatus for a vehicle heater includes a plurality of heater pipes that are disposed within the interior of a heater and a baffle pivotably disposed at both sides of the heater pipe to adjust the flow of a fluid. Wherein the baffle adjusts the flow rate of a fluid passing through the heater.

Abstract: A non-negative pressure radiator cap is provided and includes a pressure valve having a pressure member, disposed inside a body while having an aperture formed therein. The pressure member is pressed based on an increase in pressure of coolant to move coolant toward a reservoir tank. Additionally, a vacuum valve that includes a head part and a neck part moves vertically based on the pressure of the coolant to open or close the aperture. The neck part passes through the aperture from bottom to top. A sealing member is disposed between the pressure valve and the vacuum valve and has an insertion aperture that is formed at a position corresponding to the aperture of the pressure valve. A retainer is further inserted into the aperture and the insertion hole and a guide directs the vacuum valve to move vertically when the vacuum valve is opened or closed.

Abstract: An apparatus for protecting negative pressure is provided. The apparatus includes a main flow passage that circulates coolant of a vehicle and includes a section where negative pressure is formed therein. A housing is positioned at the section where the negative pressure of the main flow passage is formed and has a communication aperture that communicates with the main flow passage therein. A negative pressure valve is disposed at the inside of the housing to open or close the communication aperture based on the relationship of an exterior pressure and a valve inside pressure to maintain the valve inside pressure above a predetermined reference value.

Abstract: A thermal management system of a fuel cell vehicle includes a cold start loop which heats a coolant that flows through a fuel cell during a cold start of the fuel cell, and a cooling loop which moves a coolant that cools the fuel cell.

Abstract: A cooling system of a vehicle having a fuel cell stack includes a pump for circulating a coolant in a coolant line passing through the fuel cell stack, a heater disposed on the coolant line for heating the coolant by electric power supplied by a drive motor of the vehicle, and a controller for operating the heater by a surplus electric power generated by the drive motor when a heat generation amount of the fuel cell stack is less than a first threshold value and a rotation speed of the pump is above a second threshold value, and for turning off the heater when the heat generation amount of the fuel cell stack is less than the first threshold value and the rotation speed of the pump is less than the second threshold value.

Abstract: A thermal management system is provided which may be miniaturized and may have a reduced weight by integrating thermal management parts in a fuel cell vehicle. In particular, a new type of thermal management system integrated housing in which a housing of a pump housing part, a housing of a 3-way valve fluid part, and a bypass channel among parts of the thermal management system for a fuel cell vehicle are integrated into a single structure to reduce the size of the overall system.

Abstract: A flow control baffle apparatus for a vehicle heater is provided. The flow control baffle apparatus implements a flow control function of a fluid passing through the interior of a heater and improves the heat transfer performance of the heater. The flow control baffle apparatus for a vehicle heater includes a plurality of heater pipes that are disposed within the interior of a heater and a baffle pivotably disposed at both sides of the heater pipe to adjust the flow of a fluid. Wherein the baffle adjusts the flow rate of a fluid passing through the heater.

Abstract: A coolant bypass structure includes a main loop forming a channel in which coolant circulates; a bypass loop connected to the main loop and forming a selective bypass channel; and a stack bypass valve provided between the main loop and the bypass loop to open and close the bypass loop according to a predetermined temperature, and provided with an outlet temperature sensor. The coolant bypass structure may improve marketability by decreasing the starting time of the fuel cell vehicle in a frozen state and improve power efficiency.

Abstract: A rotatable heater of a fuel cell system includes a heater housing, into and out of which a coolant for cooling a fuel cell stack flows, and which defines a coolant chamber therein. A motor is driven by an electrical energy generated from the fuel cell stack or by another power source. At least one heater stick generates heat by the electrical energy generated by the fuel cell stack and heats the coolant. The at least one heater stick rotates by the motor.