Abstract:
A microprocessor-based electronic voltage regulation system for controlling the charging of the battery in a vehicle. The conventional voltage regulator is eliminated and the intelligence of the microprocessor already present on the vehicle for controlling engine operation is used to regulate the output of the alternator. A battery temperature signal from a temperature transducer and a battery voltage signal from a sense line connected directly to the positive terminal of the battery are supplied to the microprocessor through an analog-to-digital converter. The microprocessor is programmed to ascertain from the battery temperature signal the desired set point voltage based upon an inverse first order relationship between battery temperature and desired battery voltage with preset maximum and minimum voltage set point levels. Energization of the field windings is controlled in accordance with a comparison between the desired set point voltage and the battery voltage signal on the battery sense line and is implemented in response to a control signal from the microprocessor by a solid-state power switching circuit which interfaces with the attemator field windings. In addition, the microprocessor is provided with additional feedback information relating to various driving conditions, such as vehicle deceleration, throt- tie position, engine RPM, and elapsed time since ignition, and is further programmed to modify the desired voltage set point or modify engine RPM in accordance with such driving conditions. Overcurrent protection for the logic circuitry and improved diagnostic capabilities are also provided.
Abstract:
PROBLEM TO BE SOLVED: To provide a technology capable of enhancing energy utilizing efficiency in an air-conditioning system having a fuel cell, and suppressing the stability of temperature control. SOLUTION: A fuel cell power generation system 100 executes the intermittent operation of alternatively repeating a first operational state that a secondary cell 160 is charged while power generated by a fuel cell 110 is output to the outside of the system in the case of a low load, and a second operational state that the operation of the fuel cell 110 is stopped, and power from a secondary cell 160 is output to the outside of the system. An in-vehicle air-conditioning system 200 utilizes the output power from the fuel cell power generation system 100 in a heating mode, and also utilizes the waste heat of the fuel cell 110 via a refrigerant of the fuel cell. Furthermore, when the fuel cell power generation system 100 is in the first operational state, the drive of electric heaters 262, 263 is stopped, and when the fuel cell power generation system is in the second operational state, the refrigerant for the fuel cell is heated by the electric heaters 262, 263. COPYRIGHT: (C)2011,JPO&INPIT