Nec Corporation

Mitsubishi Electric Corporation

Sony Corporation

Toshifumi Nakamura

Kazushi Muraoka

Kojiro Hamabe

Masayuki Ariyoshi

Takahiko Inada

Hiroto Sugahara

Hiroaki Aminaka

Yasuhiko Matsunaga

Naoji Nada

Jun Shikida

Katsuhiro Yoneyama

An object is to reduce the required numbers of connector pins and A/D converters, without degrading the detection accuracy. There is provided an ignition apparatus which includes: ignition plugs provided for multiple cylinders; an ignition coil provided for each cylinder, and having a primary coil and a secondary coil magnetically coupled to the primary coil and connected to the ignition plug; switching devices each for switching between application and shut-off of current to the primary coil; a primary-voltage-signal separator provided for each cylinder, for inputting thereto a voltage of the primary coil and outputting the voltage as a primary signal; a primary-signal combiner for electrically combining together each primary signal corresponding to each cylinder, to thereby output a composite primary signal; and a primary-voltage-information detector for inputting thereto the composite primary signal, to thereby output primary voltage information of each cylinder.

Ignition apparatus

An ignition device for an internal combustion engine includes an ignition coil, a first switch, a secondary current adjuster, and controller The ignition coil includes a primary coil, a core, and a secondary coil. The first switch switches an energized state of the primary coil between an ON state and an OFF state. The secondary current adjuster adjusts a current value of a secondary current flowing through the secondary coil. The controller controls the secondary current adjuster so that a current value of the secondary current in at least a part of a charging period of the ignition plug, which is a period from when the energized state of the primary coil is switched from the ON state to the OFF state by the first switch to when dielectric breakdown occurs in the ignition plug, becomes smaller than a peak value of the secondary current after the dielectric breakdown occurs.

Ignition device for internal combustion engine

The invention provides an internal combustion engine combustion state detecting device such that ascertaining a combustion state using ionic current detection is carried out accurately over a wide operating range of an internal combustion engine. The internal combustion engine combustion state detecting device includes a spark plug that has a central electrode and a grounding electrode opposing across a gap, and a discharge stopping-induced current detecting device that estimates an induced current caused by a stopping of a spark discharge generated in the gap between the central electrode and the grounding electrode, wherein an ionic current detection threshold is set to a threshold value that is not affected by the induced current using the induced current estimated by the discharge stopping-induced current detecting device.

Internal combustion engine combustion state detecting device

Even when detecting the primary voltage of the primary coil side, without detecting the secondary voltage of the secondary coil side of high voltage, it is desired to provide a discharge state detecting apparatus of an internal combustion engine which can detect a spark discharge state with good accuracy, by reducing influences of the discharge current and the resistance component of the discharge path of the secondary coil side, which are generated in the primary voltage. A discharge state detecting apparatus of an internal combustion engine performs correction which reduces a signal component generated by the secondary current in the ignition coil from the primary voltage detected by the primary voltage detector, based on the detected secondary current, and outputs a primary voltage after correction; and determines a spark discharge state based on the primary voltage after correction.

Discharge state detecting apparatus of internal combustion engine

To provide a control device, of an internal combustion engine, that accurately identifies the combustion state through ion current detection in a wide operation range of the internal combustion engine, without impairing the reliability and the durability of the control device of the internal combustion engine. This internal combustion engine control device includes: an ignition plug having a center electrode and a ground electrode opposed to each other with a gap therebetween; a circulation device for short-circuiting a primary winding to cause a circulation route to enter a conduction state, thereby stopping spark discharge; and an ion-current-detection bias voltage control device for controlling bias voltage for ion current detection. The potential of the center electrode in an ion current detection period is controlled by adjusting the value of the bias voltage and the changing speed of the bias voltage.

Control device and control method for internal combustion engine

Because it is not possible to sufficiently reduce the number base stations that start uselessly in spite of being in a low traffic state, it is not possible to lower interference between adjacent cells and power consumption sufficiently. A base station starts transmission of a control signal with predetermined power when communication between another base station and a mobile station is started and a first predetermined condition is satisfied.

Base station, radio communications system, base station control method, radio communications method and base station control program

Provided is a discharge stopping device for stopping a spark discharge during discharge, including an ignition plug, an ignition coil, a power source device, a first switch, and a controller which causes a spark discharge to be generated by controlling the switching of the first switch, the discharge stopping device further including a second switch which is disposed in a current circulation path connecting both ends of a primary coil of the ignition coil and switches the current circulation path between connected and disconnected states, wherein the controller includes a re-energization control process unit which switches the first switch to a connected state and re-energizes the primary coil with current during occurrence of the spark discharge, and a circulation control process unit which switches a second switch to a connected state and sets a current circulation path to a connected state during occurrence of the spark discharge.

Discharge stopping device

An internal-combustion-engine combustion state detecting apparatus is configured in such a way as to include a circulation unit that short-circuits a primary winding so as to form a circulation path including the primary winding, while a spark discharge is produced in an ignition plug, and a circulation current control unit that controls a circulation current flowing in the circulation path and in such a way that based on an ion current detected by an ion current detection apparatus, the combustion state of an inflammable fuel-air mixture is detected.

Internal-combustion-engine combustion state detecting apparatus

A method and a device for estimating a communication load, as well as a radio station and an upper-level apparatus in a radio communication system, are provided that can estimate a communication load in a target network with high accuracy by using received quality information. A communication load estimation function () for estimating a communication load in a network (NW) estimates the communication load in the network by using at least a first quality indicator (Q), which is a quality measurement value including entire received power, and a second quality indicator (Q), which is a quality measurement value including the signal-to-noise-and-interference ratio of a reference signal.

Method and device for estimating communication load, radio station and upper-level apparatus in radio communication system

The present invention is a device which, when a second wireless system shares the use of a frequency which is allocated to a first wireless system, estimates receiving power when a second wireless signal which is transmitted from a transmission station of the second wireless system is received at a receiving station of the first wireless system. The receiving power estimation device comprises a correction means for correcting a receiving power estimate value of the second wireless signal at the first wireless system receiving station which is computed using an estimate value of path loss from the second wireless system transmission station to the first wireless system receiving station, said correction using a receiving power measurement value of the second wireless signal which is measured in a transmission station periphery sensor station which is a sensor station which is located in the periphery of the second wireless system transmission station.

Received power estimation device, received power estimate method, program, sensor station, and radio system

A spectrum control system according to the present invention is a spectrum control system that evaluates whether or not to allow a second wireless communication system to perform secondary use on a frequency band that is allowed to be preferentially used by a first wireless communication system, and includes a request distinguish unit () that evaluates a possibility of the secondary use influencing the first wireless communication system and an evaluation unit () that evaluates whether or not to allow the secondary use of the frequency band, which has been evaluated that there is a possibility that the frequency band may influence the first wireless communication system using an evaluation criterion more specific than that of the request distinguish unit ().

Spectrum control system, database, spectrum control method, and non-transitory computer-readable medium storing spectrum control program

[Problems] Because it is not possible to reduce sufficiently the number of base stations that starts uselessly in spite of being in light traffic state, it is not possible to lower interference between adjacent cells and power consumption sufficiently. [Measures] A base station receives a transmission signal from a mobile station to other base station, and starts transmission of a control signal with predetermined power depending on a reception condition of the transmission signal.

Growing community of inventors

Tokyo, Japan

Toshifumi Nakamura