Abstract: Target rotation speed setup section for setting a target engine rotation speed; load detection for detecting a hydraulic pump load; an assist output computation section for calculating an assist output to be generated by a motor generator in accordance with a rotation speed deviation ?N, which is the difference between an actual and target rotation speed, or in accordance with the hydraulic pump load; an absorption torque upper limit computation section for calculating an absorption torque upper limit value of the hydraulic pump; and an operation signal generation section for generating the operation signal to be output to a pump displacement adjustment device. When the rotation speed deviation ?N is equal to or more than a setting NC determined in accordance with the assist output value, the absorption torque upper limit computation section reduces the absorption torque upper limit value of the hydraulic pump from the calculated value.

Abstract: Provided is a hybrid construction machine together with a method for controlling that construction machine in a manner ensuring the operability of its combined operations regardless of fluctuations in the load on its work machine.

Abstract: The present invention includes a target rotation speed setup section (17) for setting a target rotation speed of an engine (1); load detection means (21) for detecting a load on a hydraulic pump (3); an assist output computation section (19) for calculating an assist output to be generated by a motor generator in accordance with a rotation speed deviation ?N, which is the difference between an actual rotation speed and the target rotation speed, or in accordance with the load on the hydraulic pump; an absorption torque upper limit computation section (23) for calculating an absorption torque upper limit value of the hydraulic pump (3); and an operation signal generation section (24) for generating the operation signal to be output to a pump displacement adjustment device (45).

Abstract: In a hybrid construction machine, there is provided a drive control device which realizes in, as a simple a structure as possible, control means of a motor generator, which is capable of preventing rapid decreases in the state of charge. The control means, which calculates a motor torque command value to be output to the motor generator, is characterized by calculating the motor torque command value, based on a difference between an actual state-of-charge and a prescribed target state-of-charge and a torque margin obtained by a difference between a maximum torque of an engine determined based on an actual rotational speed of the engine and an actual torque of the engine.

Abstract: An underwater sounding apparatus includes a transducer transmitting an acoustic sounding beam along a plurality of directional surfaces that intersect in three-dimensions and receiving echoes returning from within a fish school using receiving beams. The transducer can form the receiving beams in directions generally along a substantially vertical planar directional surface and in directions generally along a substantially umbrella-shaped directional surface formed around the ship, the umbrella-shaped directional surface intersecting both a horizontal plane and the vertical, planar directional surface. A signal processing section calculates fish quantity information about the fish school by constructing pseudo-three-dimensional data from data obtained by the receiving beam. Also, the signal processing section may binarize the data obtained by the receiving beams and calculates an approximate value of the volume of the fish school by constructing pseudo-three-dimensional data from the binarized data.

Abstract: A sonar emits an ultrasonic wave into the water from a transducer on the basis of a transmission signal outputted from a transmission circuit, receives an echo reflected in the water with the transducer and converts the echo into an electric signal, and displays underwater information on a display unit on the basis of an echo signal extracted by processing the electric signal. A tailing signal removing unit for removing a tailing signal and extracting only the echo signal is provided in the sonar such that a video of a surface layer fish shoal is clearly displayed on a screen of the display unit without being hidden by a video of the tailing signal.

Abstract: A sonar emits an ultrasonic wave into the water from a transducer on the basis of a transmission signal outputted from a transmission circuit, receives an echo reflected in the water with the transducer and converts the echo into an electric signal, and displays underwater information on a display unit on the basis of an echo signal extracted by processing the electric signal. A tailing signal removing unit for removing a tailing signal and extracting only the echo signal is provided in the sonar such that a video of a surface layer fish shoal is clearly displayed on a screen of the display unit without being hidden by a video of the tailing signal.

Abstract: An underwater sounding apparatus includes a transducer transmitting an acoustic sounding beam along a plurality of directional surfaces that intersect in three-dimensions and receiving echoes returning from within a fish school using receiving beams. The transducer can form the receiving beams in directions generally along a substantially vertical planar directional surface and in directions generally along a substantially umbrella-shaped directional surface formed around the ship, the umbrella-shaped directional surface intersecting both a horizontal plane and the vertical, planar directional surface. A signal processing section calculates fish quantity information about the fish school by constructing pseudo-three-dimensional data from data obtained by the receiving beam. Also, the signal processing section may binarize the data obtained by the receiving beams and calculates an approximate value of the volume of the fish school by constructing pseudo-three-dimensional data from the binarized data.

Abstract: An automatically tracking scanning sonar alternately performs horizontal scanning and vertical scanning and a target lock processor calculates a predicted position of a target based on an echo signal previously received from the target when the echo signal from the target is interrupted. A selector sets a range, tilt angle and sounding direction and outputs them to a transmit-receive controller such that the scanning sonar can scan the predicted target position. As the depth of the target is determined by performing the vertical scanning, the tilt angle of an umbrellalike beam pattern produced by the horizontal scanning can be varied to follow the target by controlling the tilt angle based on target depth information even when the target moves in vertical directions. It is therefore possible to automatically track the target in a reliable fashion.

Abstract: A mixer shifts the center frequency of a received signal to a baseband according to a center frequency detected by a center frequency detector or a center frequency estimated from ship speed, for example, by a center frequency estimator. The passband of a variable passband filter varies according to a bandwidth detected directly from the received signal by a bandwidth detector or a bandwidth estimated from the pulselength of a transmitting signal by a bandwidth estimator, whereby the bandwidth of a baseband signal output from the mixer is limited to remove undesired noise components in the received signal.

Abstract: In a cylindrical transducer constructed of a plurality of ultrasonic transducer arrays arranged in a circular form, the ultrasonic transducer arrays is divided into a plurality of groups, and tilt angles of transmitting and receiving beams are controlled to compensate for swing motions of the cylindrical transducer depending on which group the individual ultrasonic transducer arrays belong. Provided that the uncompensated tilt angle of the beam is a and the angle of inclination of the cylindrical transducer in a particular direction is b, the tilt angle of the beam formed by a transducer array in the inclining direction should be adjusted to &agr;−&bgr; and the tilt angle of the beam formed by a transducer array in the opposite direction should be adjusted to &agr;+&bgr;.

Abstract: An automatically tracking scanning sonar alternately performs horizontal scanning and vertical scanning and a target lock processor calculates a predicted position of a target based on an echo signal previously received from the target when the echo signal from the target is interrupted. A selector sets a range, tilt angle and sounding direction and outputs them to a transmit-receive controller such that the scanning sonar can scan the predicted target position. As the depth of the target is determined by performing the vertical scanning, the tilt angle of an umbrellalike beam pattern produced by the horizontal scanning can be varied to follow the target by controlling the tilt angle based on target depth information even when the target moves in vertical directions. It is therefore possible to automatically track the target in a reliable fashion.

Abstract: A mixer shifts the center frequency of a received signal to a baseband according to a center frequency detected by a center frequency detector or a center frequency estimated from ship speed, for example, by a center frequency estimator. The passband of a variable passband filter varies according to a bandwidth detected directly from the received signal by a bandwidth detector or a bandwidth estimated from the pulselength of a transmitting signal by a bandwidth estimator, whereby the bandwidth of a baseband signal output from the mixer is limited to remove undesired noise components in the received signal.

Abstract: In a cylindrical transducer constructed of a plurality of ultrasonic transducer arrays arranged in a circular form, the ultrasonic transducer arrays is divided into a plurality of groups, and tilt angles of transmitting and receiving beams are controlled to compensate for swing motions of the cylindrical transducer depending on which group the individual ultrasonic transducer arrays belong. Provided that the uncompensated tilt angle of the beam is a and the angle of inclination of the cylindrical transducer in a particular direction is b, the tilt angle of the beam formed by a transducer array in the inclining direction should be adjusted to &agr;−&bgr; and the tilt angle of the beam formed by a transducer array in the opposite direction should be adjusted to &agr;+&bgr;.

Abstract: The present invention is directed to an ultrasound diagnostic apparatus which can display a superimposed picture of both B-mode and color flow mode images without loosing information of either image. The ultrasound diagnostic apparatus transmits an ultrasonic pulse signal to a specified region of a living body including its moving parts such as a blood flow and displays a status within that region of the living body based on reflected ultrasonic waves which have been received.

Abstract: The present invention relates to a display system for displaying a past track of the ship, the present position of the ship, and a future predicted track of the ship. A display system according to the present invention generates coordinate data representing a desired pattern based on the ship's speed and the ship's bearing in order to display a past track of the ship and a future predicted track of the ship.

Abstract: The present invention relates to a display system for displaying a past track of the ship, the present position of the ship, and a future predicted track of the ship, A display system according to the present invention generates coordinate data representing a desired pattern based on the ship's speed and the ship's bearing in order to display a past track of the ship and a future predicted track of the ship.

Abstract: A system measures the velocity of a moving body such as a ship and a water body. The system uses a first apparatus which measures the speed of a moving body by detecting a phase difference between a reference signal and echo signals resulting from a transmitted ultrasonic signal, implementing a Fourier transformation on the phase difference data obtained, computing the speed of the ship with respect to the water based on the Fourier spectrum data, and, computing the velocity of a water current based on the speed of the ship with respect to the ground and the speed of the ship with respect to the water obtained.