Abstract: The fuel cell system includes a fuel cell, a first injection device associated with a supply of a fuel to the fuel cell, and a second injection device provided on an upstream side of the first injection device in a fuel flow passage from a fuel storage unit to the first injection device. The first and second injection devices switch a flow passage extending downstream from the fuel flow passage, between a first flow passage via the first injection device and second flow passage via the second injection device. The second injection device operates at a lower frequency than the first injection device during an operation of the fuel system.

Abstract: The fuel cell system includes a fuel cell, a first injection device associated with a supply of a fuel to the fuel cell, and a second injection device provided on an upstream side of the first injection device in a fuel flow passage from a fuel storage unit to the first injection device. The first and second injection devices switch a flow passage extending downstream from the fuel flow passage, between a first flow passage via the first injection device and second flow passage via the second injection device. The second injection device operates at a lower frequency than the first injection device during an operation of the fuel system.

Abstract: A sliding seal seals an annular gap between a first member and a second member to separate a high-pressure side and a low-pressure side from each other, the first member being movable relative to the second member. The sliding seal is provided at an annular attaching groove provided at the second member. The sliding seal includes: a pressure fluid seal configured to slidingly contact a sliding surface of the first member; and a lubricant holding piece provided at the high-pressure side of the pressure fluid seal, a lubricant storage space being formed between the lubricant holding piece and the pressure fluid seal.

Abstract: A sliding seal seals an annular gap between a first member and a second member to separate a high-pressure side and a low-pressure side from each other, the first member being movable relative to the second member. The sliding seal is provided at an annular attaching groove provided at the second member. The sliding seal includes: a pressure fluid seal configured to slidingly contact a sliding surface of the first member; and a lubricant holding piece provided at the high-pressure side of the pressure fluid seal, a lubricant storage space being formed between the lubricant holding piece and the pressure fluid seal.

Abstract: A sliding seal seals an annular gap between a first member and a second member to separate a high-pressure side and a low-pressure side from each other, the first member being movable relative to the second member. The sliding seal is provided at an annular attaching groove provided at the second member. The sliding seal includes: a pressure fluid seal configured to slidingly contact a sliding surface of the first member; and a lubricant holding piece provided at the high-pressure side of the pressure fluid seal, a lubricant storage space being formed between the lubricant holding piece and the pressure fluid seal.

Abstract: A fuel gas supply device for supplying fuel gas to a fuel cell stack includes a control valve provided in a fuel gas path connecting a fuel tank and the fuel cell stack, an upstream-side pressure sensor and a downstream-side pressure sensor for detecting an upstream-side pressure and a downstream-side pressure, and a programmable controller. The programmable controller calculates a required opening based on a target fuel gas pressure and the downstream-side pressure and calculates an opening time and a closing time based on the required opening and the upstream-side pressure, or calculates an opening time and a closing time based on the target fuel gas pressure and the downstream-side pressure and calculates a required opening based on the opening time and the upstream-side pressure, and controls the control valve using the calculated required opening, opening time and closing time.

Abstract: A fuel gas supply device for supplying fuel gas to a fuel cell stack includes a control valve provided in a fuel gas path connecting a fuel tank and the fuel cell stack, an upstream-side pressure sensor and a downstream-side pressure sensor for detecting an upstream-side pressure and a downstream-side pressure, and a programmable controller. The programmable controller calculates a required opening based on a target fuel gas pressure and the downstream-side pressure and calculates an opening time and a closing time based on the required opening and the upstream-side pressure, or calculates an opening time and a closing time based on the target fuel gas pressure and the downstream-side pressure and calculates a required opening based on the opening time and the upstream-side pressure, and controls the control valve using the calculated required opening, opening time and closing time.

Abstract: A gas flow measuring device and gas flow measuring method are disclosed wherein specific gas component of measuring object gas or target gas composed of gas different from the specific gas component are added to or extracted from the measuring object gas, and concentrations C1 and C2 of the specific gas component before and after the target gas is added to or extracted. A detector (111, 121) is provided to calculate the flow rate Q1 in response to the detected concentrations C1, C2 or to detect the flow rate Q1 of the measuring object gas, and the flow rate Q3 of added or extracted target gas is detected in response to the flow rate Q1 and the concentrations C1, C2 which are detected.

Abstract: A gas flow measuring device and gas flow measuring method are disclosed wherein specific gas component of measuring object gas or target gas composed of gas different from the specific gas component are added to or extracted from the measuring object gas, and concentrations C1 and C2 of the specific gas component before and after the target gas is added to or extracted. A detector (111, 121) is provided to calculate the flow rate Q1 in response to the detected concentrations C1, C2 or to detect the flow rate Q1 of the measuring object gas, and the flow rate Q3 of added or extracted target gas is detected in response to the flow rate Q1 and the concentrations C1, C2 which are detected.

Abstract: For use on automobiles, the invention provides a compact device for measuring the concentration of a nitrogen oxide in a combustion gas such as an exhaust gas of an internal combustion gas. The device has an ion pumping cell using an oxygen ion conductive solid electrolyte to adjust the partial pressure of oxygen in a gas diffusion chamber and a sensor such as an oxygen concentration cell using a solid electrolyte to detect the partial pressure of oxygen in the chamber. The pumping cell or the concentration cell is provided with a catalyst which decomposes the nitrogen oxide in the diffusion chamber only when the partial pressure of coexisting oxygen is sufficiently low.

Abstract: An NOx concentration measuring apparatus employing first and second wide-range air/fuel ratio sensors for measuring an NOx concentration of gases introduced thereto through a first passage. First and second restricted orifices are provided in the first passage upstream of the first and second sensors. A second passage is connected to the first passage between the first and second orifices. A suction pump is connected to the first passage downstream of the first and second sensors for producing a suction vacuum in the first passage and is also connected to the second passage for producing a suction vacuum in the second passage. The first and second orifices are effective to prevent momentary gas pressure fluctuations from affecting the accuracy of measurement of the first and second sensors.

Abstract: There is disclosed a fuel feeding device for an internal combustion engine equipped with an air regulator for feeding air through a bypass around a throttle valve and a fuel jetting valve for feeding fuel. An air passage outlet of said air regulator is open opposite to and facing said fuel jetting valve. The opening degree of said air regulator is controlled by a coil bimetal functioning in proportion to the temperature of the engine or through a step motor being driven through a controlling circuit detecting operation conditions of the engine.

Abstract: A carburetor is provided with a fuel passage which leads to a float chamber and has an air bleed opening therein, and has a nozzle leading from the fuel passage to the intake passage to discharge fuel with air bubbles into it. The nozzle is formed as a multiconduit structure along at least part of its length, in order to improve breaking up of air bubbles in the fuel, and the atomization thereof.