초록 ▼

A drive system for a compressor that delivers compressed air to a fuel cell system in a motor vehicle. The drive system includes an electric motor that drives the compressor. During normal operation of the fuel cell system, the motor is fed with electrical energy from the fuel cell system. During st

A drive system for a compressor that delivers compressed air to a fuel cell system in a motor vehicle. The drive system includes an electric motor that drives the compressor. During normal operation of the fuel cell system, the motor is fed with electrical energy from the fuel cell system. During start-up of the fuel cell system, the electric motor receives electrical energy from a low voltage battery, where the electric motor can be operated at a voltage that is significantly higher than the output voltage of the low voltage battery. An expander can be connected to the compressor to drive the compressor with energy from cathode exhaust gases. Further, hydrogen recirculation can also be employed.

대표청구항 ▼

A drive system for a compressor that delivers compressed air to a fuel cell system in a motor vehicle. The drive system includes an electric motor that drives the compressor. During normal operation of the fuel cell system, the motor is fed with electrical energy from the fuel cell system. During st

A drive system for a compressor that delivers compressed air to a fuel cell system in a motor vehicle. The drive system includes an electric motor that drives the compressor. During normal operation of the fuel cell system, the motor is fed with electrical energy from the fuel cell system. During start-up of the fuel cell system, the electric motor receives electrical energy from a low voltage battery, where the electric motor can be operated at a voltage that is significantly higher than the output voltage of the low voltage battery. An expander can be connected to the compressor to drive the compressor with energy from cathode exhaust gases. Further, hydrogen recirculation can also be employed. Corporation 1989). Kroeger et al., "Robust modem and coating techniques for FM Hybrid IBOC DAB," IEEE Transactions on Broadcasting, vol. 43, No. 4, Dec. 1997, pp. 412-420. rbitrary speed in order to test external equipment connected to the optical distribution network matching part with ease. 3. The optical network unit function processing apparatus in ATM-PON system according to claim 2, wherein the ATM processing part further comprising: an downward UTOPIA input part reading the ATM cell from the optical distribution network matching part and reconstructing a header information of the ATM cell, then the downward UTOPIA input part generating a downward connecting memory address storing an information corresponding to the ATM cell; a downward connecting-table control part reading and processing parameters, which are related to the downward OAM and QOS control functions, from an external downward connecting memory in use of a memory address generated from the downward UTOPIA input part, after completion of the processes, the downward connecting-table control part storing values of the parameters which need to be updated in the downward connecting memory; a downward OAM processing part detecting generation or cancellation condition of the downward traffic and generating an OAM cell corresponding to each alarming state, the downward OAM processing part calculating and accumulating function-related data when a forward or backward PM cell is received; a QOS control part storing the downward traffic in accordance with QOS requirements of respective subscribers in buffers of different levels and scheduling the buffers according to the respective QOS levels for differential services; a downward UTOPIA output part transforming the received upward ATM cell data into bits and transferring the bits to the AAL1 processing part; a downward connecting-memory connecting part mediating requirements of the respective parts so that each external downward connecting memory is read and written by the downward UTOPIA input part, the downward connecting-table control part, the downward OAM processing part, and the processor connecting part; a cell memory connecting part mediating requirements of the respective parts wherein each of the external cell memory is read and written by the QOS control part and the processor connecting part; and a downward test-cell generating part generating an ATM cell of an arbitrary form required by an user at an arbitrary speed in order to test external equipments connected to the AAL1 processing part with ease. 4. The optical network unit function processing apparatus in ATM-PON system according to claim 2, wherein the AAL1 processing part further comprising: an upward AAL processing part preparing ATM cell payloads by means of receiving frame numbers, channel numbers, data, and signal data which are inputted to respective lines of a plurality of subscribers and multiplexing the ATM cell payloads generated from the respective lines in order; an upward ATM processing part generating an ATM cell by adding an ATM header to the ATM cell payload multiplexed by the upward AAL processing part; and an upward UTOPIA connecting part supplying the ATM processing part with the ATM cell generated from the upward ATM processing part through an UTOPIA bus. 5. The optical network unit function processing apparatus in ATM-PON system according to claim 4, wherein the AAL1 processing part further comprising: a downward UTOPIA connecting part receiving the ATM cell transferred from the ATM processing part through the UTOPIA bus; a downward ATM processing part removing each of the ATM headers in each of the subscriber lines and extracting an ATM payload information; and a downward AAL processing part searching a damaged ATM cell and a mis-inserted ATM cell out of the ATM payload information extracted from the downward ATM processing part, the downward AAL processing part making compensation.