摘要:
A fuel cell system performing a pre-process for electric generation in a fuel cell controls at least one of a flow amount of fuel gas flowing through a fuel gas supply path and a flow amount of off gas flowing through an off gas circulation path in order to regulate a circulation ratio of a mixed gas composed of the fuel gas and the off gas. The circulation ratio is a ratio between a mole flow amount of the off gas to a mole flow amount of the fuel gas. Before initiating usual electric generation of the fuel cell, the fuel cell system performs the pre-process in which the fuel gas is supplied to the fuel cell in order to set the circulation ratio within a predetermined range. The lower limit of the circulation ratio is set to a value by which all initial gas in a fuel electrode of the fuel cell before initiating the pre-process is exhausted completely. The upper limit of the circulation ratio is set so that a gas concentration of the mixed gas required to initiate the electric generation in the fuel cell is obtained.
摘要:
A fuel cell system is provided which includes an off-gas recirculating mechanism working to mix an off-gas discharged from a fuel cell with a hydrogen gas supplied to the fuel cell. The off-gas recirculating mechanism is implemented by an ejector vacuum pump which is controllable of an area of an outlet thereof to bring an output pressure into agreement with a target one. Use of such a type of ejector vacuum pump ensures desired accuracy of recirculation of the off-gas and regulation of the pressure of fuel supplied to the fuel cell.
摘要:
A sealing structure seals a clearance between a housing and a brake rotor. The housing defines a fluid chamber for sealing a magnetic viscous fluid inside. The brake rotor penetrates through the housing and generates brake torque by contacting the magnetic viscous fluid. The housing has a magnetic sleeve section and a magnetic screw section provided to the brake rotor. The magnetic sleeve section is continuous in a rotational direction of the brake rotor and generates a magnetic flux. The magnetic screw section is an external screw having a screw thread, which extends away from a fluid chamber side toward a phase adjusting mechanism side when traced in a rotational direction of the brake rotor. The magnetic flux is guided to the magnetic screw section through a sealing gap between the magnetic screw section and an inner peripheral section of the magnetic sleeve section.
摘要:
A sealing structure seals a clearance between a housing and a brake rotor. The housing defines a fluid chamber for sealing a magnetic viscous fluid inside. The brake rotor penetrates through the housing and generates brake torque by contacting the magnetic viscous fluid. The housing has a magnetic sleeve section and a magnetic screw section provided to the brake rotor. The magnetic sleeve section is continuous in a rotational direction of the brake rotor and generates a magnetic flux. The magnetic screw section is an external screw having a screw thread, which extends away from a fluid chamber side toward a phase adjusting mechanism side when traced in a rotational direction of the brake rotor. The magnetic flux is guided to the magnetic screw section through a sealing gap between the magnetic screw section and an inner peripheral section of the magnetic sleeve section.
摘要:
A variable valve timing apparatus has a case, a rotor, and a magneto-rheological fluid. The magneto-rheological fluid gives variable braking force to the rotor. The rotor is connected with a phase adjusting mechanism. The phase adjusting mechanism adjusts a phase of an internal combustion engine according to braking force. A sealing device is disposed between the case and the rotor. In one embodiment, the sealing device has a magnet and a plurality of flux guide members. In other embodiment, a diaphragm which acts as a damper mechanism for absorbing an internal pressure change is disposed on a fluid chamber in which the magneto-rheological fluid is kept.
摘要:
A fuel cell system is provided which includes a fluid pump such as an ejector pump. The fluid pump is designed to be driven by energy of air flowing within an air line through which air is supplied to a fuel cell. The fluid pump works to suck a fluid containing drops of water and residual gasses from the hydrogen line, thereby ensuring desired startability and stability of operation of the fuel cell.
摘要:
A fuel cell system with a fuel cell (FC stack) has an off gas circulation path to the fuel cell, an off gas exhaust unit, and an off gas pressure sensor. The system measures physical properties such as a pressure and temperatures of the off gas at various timings before and after the purging, and the calculator in the system calculates an off gas density and a hydrogen concentration in the off gas based on the measured physical properties. The system determines optimum conditions such as a start-up time and an operation period of time for the purging based on the measured and calculated values.
摘要:
A fuel supply system for use in a fuel cell system which includes a controller, a pressure regulator, and an ejector device. The controller controls the pressure of a main flow of fuel gas outputted from the pressure regulator and the position of an ejector nozzle of the ejector vacuum pump as a function of electricity generated by a fuel cell to adjust a flow rate of an off-gas to be recirculated to the fuel cell. This structure eliminates the need for an additional flow regulator to regulate the flow rate of the off-gas, thereby ensuring the stability in controlling the flow rate of the off-gas to be recirculated.
摘要:
A tube is provided with elastically deformable tube deforming sections (tube curved sections), and a fin is provided with the quality of spring so that the fin deforms in accordance to changes of dimension between the tubes. Accordingly, it is possible to weaken (absorb) stress by the tube deforming sections (tube curved sections), and to prevent the fin from separating from the tube even when the tube deforming section (tube curved section) deforms.
摘要:
An apparatus for purifying an exhaust gas for an internal combustion engine having units for the adsorption of HC gases in the exhaust gas, arranged in an exhaust manifold of the engine facing corresponding exhaust ports in such a manner that straight flows from the corresponding exhaust ports contact the corresponding adsorption units. A controller receives a signal indicating a temperature of one of a catalytic converter and the adsorption units. The controller sends a signal to a cooling apparatus, such as a fan, indicating a desired on condition of the cooling apparatus based on the temperature signal. The cooling apparatus is provided for generating air flows for cooling the adsorption units. The fan is operated when the engine, in a cold state, is started. The operation of the fan is continued until a catalytic converter arranged downstream from the adsorption units becomes effective, i.e. the temperature of the catalytic converter is higher than a predetermined value.