Abstract:
Buck-boost type or buck type chopper circuits and transistors are employed as inverters (IV1, IV2) and power synchronizing switches (SW1, SW2), respectively. A PWM signal is applied to transistors of the chopper circuits to convert DC voltage generated by solar cells (DC1, DC2) into positive and negative half-wave AC voltages for an AC power supply (AC1). The inverters (IV1, IV2) output the AC voltages from their AC output terminals on alternate half cycles thereby to cause backflow of power. The power synchronizing switches (SW1, SW2) performs not only the function of transmitting the half-wave AC voltages generated by the inverters (IV1, IV2) to the AC power supply (AC1) in accordance with the AC cycle of the AC power supply (AC1), but also the function of, when one of the inverters is in operation, insulating the other from the AC power supply (AC1). This achieves a DC-AC system connecting device that is capable of establishing a ground for both DC and AC sides only with a few transistors and diodes without a transformer.
Abstract:
A DC to DC power converter of the chopper-type includes a reverse conducting main thyristor device, or equivalent, and a saturable autotransformer in the power path of the main thyristor device, the autotransformer being in the saturated state when the main thyristor device is conducting, and a gated capacitor commutating circuit to desaturate the autotransformer for commutating the main thyristor device out of conduction.
Abstract:
A radio network control apparatus includes a free channel counting unit to count the number of free channel identifiers in a range between a last-used channel identifier of the radio network control apparatus itself and that of its peer apparatus. A channel identifier acquiring unit then selects a free channel identifier, based on the number of free channels counted by the free channel counting unit, thus preventing the two radio network control apparatuses from selecting the same channel identifier.
Abstract:
A traction transmission capacity control device includes a one-direction turning-stop-position detecting means configured to detect a position at which the turning of a second roller stops after a second-roller turning means starts to turn the second roller in one direction; an another-direction turning-stop-position detecting means configured to detect a position at which the turning of the second roller stops after the second-roller turning means starts to turn the second roller in another direction; and a second-roller turning-motion reference-point setting means configured to set a center position between the position detected by the one-direction turning-stop-position detecting means and the position detected by the another-direction turning-stop-position detecting means, as a turning-motion reference point of the second roller. The traction transmission capacity control device is configured to perform a traction transmission capacity control based on a second-roller turning amount given from the turning-motion reference point of the second roller.
Abstract:
A traction transmission capacity control device used in a drive force distribution device includes a second-roller turning means configured to turn the second roller around an eccentric axis deviated from a rotation axis of the second roller, and thereby to control a mutual radially-pressing force between the first roller and the second roller so that a traction transmission capacity is controlled. The traction transmission capacity control device further includes a one-direction turning-stop-position detecting means configured to detect a position at which the turning of the second roller stops after the second-roller turning means starts to turn the second roller in one direction; an another-direction turning-stop-position detecting means configured to detect a position at which the turning of the second roller stops after the second-roller turning means starts to turn the second roller in another direction; and a second-roller turning-motion reference-point setting means configured to set a center position between the position detected by the one-direction turning-stop-position detecting means and the position detected by the another-direction turning-stop-position detecting means, as a turning-motion reference point of the second roller. The traction transmission capacity control device is configured to perform a traction transmission capacity control based on a second-roller turning amount given from the turning-motion reference point of the second roller.
Abstract:
To provide a network monitoring system extracting the performance measurement data while eliminating the performance measurement data that is not effective for improvement of the network performance on the basis of a predetermined extraction condition and presenting the extraction result to the operator. The network monitoring system includes extraction condition presenting means for presenting a predetermined extraction condition indicating a relationship between performance measurement data of each device configuring the network and a status of a device to be eliminated upon extracting said performance measurement data; and performance measurement data extracting means for eliminating the performance measurement data that is measured under a status of the device to be eliminated on the basis of an extraction condition indicated by said extraction condition presenting means and extracting the performance measurement data that is effective for improvement of the network performance.
Abstract:
In apparatus and method for controlling a vehicular velocity for an automotive vehicle, when a controller carries out a preceding vehicle follow-up control to follow up a preceding vehicle which is traveling ahead of the vehicle and is decelerated and a vehicular velocity of the vehicle becomes reduced and has crossed a set lower limit value of the vehicular velocity in a vehicular velocity controllable range, the controller releases the preceding vehicle follow-up control but continues a braking operation through a vehicular brake system using a function generator (Pbrk*=f(t)MPa) to prevent a sudden G drop from occurring.
Abstract:
The diagnostic device comprises voltage divider resistors, two comparators, a start switch, a microcomputer, two transistors, and two light emitting diodes. The ignition signal is voltage-divided by the voltage divider resistors, and the result of this voltage division is input into the positive terminals of the comparators. Reference voltages are input to the negative terminals of the comparators which determine how high the inputs to the positive terminals must be for each comparator to have an "H" level output. When the start switch is turned ON the device starts to operate. In the microcomputer, which has a timer function built in, the interrupt terminal (INT) becomes connected to the output terminal of the comparator; the reset terminal (RES) becomes connected to the start switch. In addition, when the result of the diagnosis is normal, the output terminal OUT 1 of the microcomputer connected to the base of the transistor outputs a signal, while when the result of the diagnosis is abnormal, the output terminal OUT 2 connected to the base of the transistor outputs a signal. A light emitting diode of one color, for example green, is connected to the collector of the transistor, and lights up when the result of the diagnosis is normal, while a light emitting diode of another color, for example red, is connected to the collector of the other transistor, and lights up when the result of the diagnosis is abnormal.
Abstract:
To provide a network monitoring system extracting the performance measurement data while eliminating the performance measurement data that is not effective for improvement of the network performance on the basis of a predetermined extraction condition and presenting the extraction result to the operator. The network monitoring system includes extraction condition presenting means for presenting a predetermined extraction condition indicating a relationship between performance measurement data of each device configuring the network and a status of a device to be eliminated upon extracting said performance measurement data; and performance measurement data extracting means for eliminating the performance measurement data that is measured under a status of the device to be eliminated on the basis of an extraction condition indicated by said extraction condition presenting means and extracting the performance measurement data that is effective for improvement of the network performance.
Abstract:
In an automatic vehicular velocity control apparatus for an automotive vehicle, a relative velocity detector is provided to detect a relative velocity of a preceding vehicle to the vehicle, an inter-vehicle distance command value calculator is provided to calculate an inter-vehicle distance command value, a control response characteristic determinator is provided to determine a control response characteristic of the inter-vehicle distance control system according to a deviation from the inter-vehicle distance command value to a detected value of the inter-vehicle distance and a detected value of the relative velocity, a vehicular velocity command value calculator is provided to calculate a vehicular velocity command value on the basis of the determined control response characteristic of the inter-vehicle distance control system, and a vehicular velocity control section is provided to control at least one of a driving force of the vehicle, a braking force of the vehicle, and a gear ratio of a transmission in such a manner that a detected value of the vehicular velocity is made coincident with the vehicular velocity command value. The control response characteristic determinator includes maps representing a relationships of a specific angular frequency &ohgr;M (or &ohgr;c) with respect to the relative velocity &Dgr;V and an inter-vehicle distance deviation &Dgr;L and a damping factor &zgr;M (or &zgr;c) with respect to the relative velocity and the inter-vehicle distance deviation.