Abstract:
PROBLEM TO BE SOLVED: To provide a fuel cell system including a pressure control valve of a fuel gas, in which air pressure supplied to the fuel cell is utilized as the movement force of the valve, it is so arranged that the pressure of the air supplied to the fuel cell and the pressure of the fuel gas supplied to the fuel cell can be set respectively, independent from each other. SOLUTION: The fuel cell system is provided with the fuel cell (20) that generates electricity out of the fuel gas supplied via a gas flow passage (75) and an oxidization gas supplied via an oxidization gas flow passage (71), the fuel gas pressure control valve (32) that is installed on the fuel gas flow passage (75) and controls the pressure of the fuel gas supplied to the fuel cell (20) by implementing an applying pressure powered by the pressure of the oxidization gas, and the applying pressure control valve (15) that regulates the applying pressure. By the above, the fuel gas pressure and the oxidization gas pressure can be set independently from each other. Furthermore, it becomes also possible that oxidization gas can be related to the supply the pressure of the oxidization gas. COPYRIGHT: (C)2005,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To control the heat generation of a motor and incompatibility to a driver. SOLUTION: In a vehicle, a torque reduction rate value RT1 is set with a tendency of becoming smaller as road surface gradient α and vehicle weight M get larger (S340), when an absolute value of vehicle speed V is a threshold Vref or less, a previous torque command (previous Tm*) of a motor is a threshold Tmref or more, and a temperature rise promotion time t is a threshold Tmref or more. A torque command Tm* is set by subtracting the torque reduction rate value RT1 from the previous torque command (previous Tm*) of the motor (S400). The motor is driven and controlled with the torque command Tm* set up. Thereby, the temperature rise of the motor and an inverter driving the motor can be controlled by backing up a vehicle at more appropriate speed. COPYRIGHT: (C)2009,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To allow an inverter to be cooled with proper cooling performance according to a heating amount of inverter switching elements in a system provided with a cooling device for cooling the inverter.SOLUTION: A higher one of switching frequencies for first and second inverters 22 and 23 is set as a switching frequency for inverter cooling control. Further, a higher one of motor outputs for first and second AC motors 12 and 13 is set as a motor output for inverter cooling control. A target cooling water flow rate for inverter cooling control according to the switching frequency and motor output for inverter cooling control is calculated, and an electric water pump 39 is driven so that a flow rate of cooling water for a cooling device 40 may be the target cooling water flow rate. This makes it possible to properly respond to variation in the heating amount of inverter switching elements due to any change in the switching frequency and motor output, which changes a flow rate of the cooling water, so that the cooling performance of the cooling device 40 can vary.
Abstract:
PROBLEM TO BE SOLVED: To eliminate the need of preliminary adaption when suppressing a rattling sound in starting an internal combustion engine from a stop state. SOLUTION: When the start request of an engine is made when a shift position is set to a parking position, pressurization torque Tp is set to a torque command Tm2* of a motor MG2 before the start of the engine (step S160), and a motor is controlled so that the torque Tp can be output from the motor MG2. Then, time change quantity dθe2/dt of an electrical angle θe2 of the motor MG2 is changed to any significant value other than a value 0 (step S140), and time change quantity dθe1/dt of an electrical angle θe1 of the motor MG1 is changed to any significant value other than the value 0 (step S150). Thus, it is possible to assume that the filling looseness of a gear mechanism between the motor MG1 and the motor MG2 is completed, and the rattling sound is put to a suppressable state. Afterwards, the start of the engine is permitted. COPYRIGHT: (C)2009,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To facilitate accurate determination of an appropriate amount of cooling water in a cooling system. SOLUTION: A water level confirming level gauge 22 installed in a reserve tank 20 comprises a level gauge body 24, a water level reference determining means 30 and a reference mark position changing mechanism 34. The level gauge body 24 is provided with reference marks 26a, 26b indicating the lower limit water level and upper limit water level respectively. The reference marks 26a, 26b are provided movably in the vertical direction of the level gauge body 24. The reference mark position changing mechanism 34 connects the level gauge body 24 to the water level reference determining means 30. The water level reference determining means 30 determines the water level reference of the level gauge based on the change of temperature. The reference mark position changing mechanism 34 changes the positions of the reference marks 26a, 26b according to the water level reference determined by the water level reference determining means 30. COPYRIGHT: (C)2008,JPO&INPIT