Denso Corporation

Nippon Soken, Inc.

Naoki Yamamoto

Yuji Hayashi

Hitoshi Irie

Makoto Taniguchi

Kazuyoshi Obayashi

Yukihiro Yamashita

Kiyoshi Nagata

Tatsuya Suzuki

Keisuke Tani

Masaya Ootake

Tooru Ooiwa

Nobumasa Ueda

Katsunori Tanaka

Norihito Kimura

Takuto Suzuki

Hiroyasu Baba

Takeshi Shimoyama

Kazuo Nomoto

Yuuki Tsutsu

Kenzi Ueda

An apparatus is provided to estimate a charged state of a vehicle provided with an internal combustion engine having a crankshaft, a starter that initially rotates the crankshaft when the engine is started, and a battery that powers the starter. The apparatus comprises a detection device and an acquisition device. The detection device detects a voltage of the battery and a discharge current from the battery for a period of time over time instants before and after starting the engine. The acquisition device acquires information indicative of an amount of the discharge current from the battery when the detected voltage of the battery becomes a minimum due to starting the engine.

Apparatus for estimating charged state of on-vehicle battery

A vehicle power system is provided with a switching power supply that generates an operation power for operating a plurality of ECU by stepping down a power supply supplied from at least one of a generator and a battery, and a power distributor that distributes and supplies the operation power generated by the switching power supply to the individual ECUs.

Vehicle power system

An apparatus for estimating rotor position for brushless motors capable of accurately estimating rotor position is provided. The apparatus may be used as a start-up system for brushless motors. The apparatus performs accurate estimation even though power source voltage fluctuates, and is able to provide compact configuration. The apparatus supplies voltage to the coils respectively. In each supplying period, the apparatus counts voltage supply period of time until current value reaches to a current threshold value. Since a coil indicative of rotor stop position is prone to be magnetically saturated. The apparatus estimates the rotor stop position based on the voltage supply periods. Then, the apparatus starts a switching sequence based on the rotor stop position.

Apparatus for estimating rotor position of brushless motors and system and method for controlling start-up of brushless motors

In an air-conditioning system for a vehicle, which has multiple heat sources (an evaporator and a heat accumulator), either one of the heat sources, for which the input energy amount for the unit cooling capacity is smaller than that for the other heat source, is preferentially used for performing the cooling operation, an energy amount for the air-conditioning operation can be reduced.

Multiple cooling sources for a vehicle air conditioning system

An electric power generation control apparatus for a vehicle alternator mounted on a motor vehicle performs one of a constant output voltage control a constant torque control and a constant exciting current control in order to suppress a hunting phenomenon of the vehicle alternator. First of all, the electric power generation control apparatus performs the constant output voltage control when a rotation speed is within an idling rotation speed range or a periodic change of the rotation speed is not less than a predetermined value. After completion of the constant output voltage control, when judging that the idle hunting phenomenon is not adequately suppressed, the electric power generation control apparatus performs one of the constant torque control and the constant exciting current control.

Electric power generation control apparatus for vehicle alternator

The vehicle-installed microcomputer system includes an A/D converter converting analog signal sent from an onboard sensor circuit into digital signal, a microcomputer which operates in one of regular mode where a predetermined arithmetic computation on the digital signal is performed, and sleep mode where the predetermined arithmetic computation is prohibited from being performed, a first power supply circuit supplied with electric power from outside to produce a power supply voltage to be applied to the microcomputer, a second power supply circuit supplied with electric power from outside through an interruption switch to produce a power supply voltage to be applied to the A/D converter and the sensor circuit, the second power supply circuit having an output voltage accuracy higher than that of the first power supply circuit. The power interruption switch is opened to prohibit the second power supply circuit from being supplied with electric power in the sleep mode.

Vehicle-installed microcomputer system that interrupts power to higher accuracy power supply circuit for sensor A/D converter in sleep mode

In an alternator, a voltage control device includes a control circuit IC chip, a radiating fin and a case. The radiating finhas a basethat is fixed to the IC chip and radiating portions. The radiating portions protrudes from the baseand have substantially U-shaped cross sections, so that tubular air passages are formed between the radiating portions and a fixed surface of the IC chip. Each radiating portion has a central trunk and alternating branches, thereby rows of air passages are formed by the central trunk and rows of branches.

Voltage control device for vehicular alternator

In a regulator (voltage control apparatus), an IC chip is adhered to the surface of a first metal plate. A lead wire connects the IC chip with an outside connecting terminal. A second metal plate formed to cover the IC chip is formed integrally with a negative side wiring for supplying a battery voltage into the IC chip.

Voltage control apparatus for vehicle AC generator

In the resin shield circuit device, a resin case is provided with a recess having an opening. Each end of connector terminals is exposed out of the resin case and the other end thereof is embedded into the resin case. Base portions of wiring metal pieces are embedded into the resin case and connected in circuit with the other ends of the connector terminals. Connecting portions of the wiring metal pieces protrude into the recess. Lead terminals of circuit elements are connected and fixed to the connecting portions, respectively. A resin shield portion filled in the recess covers the circuit elements and the connecting portions of the wiring metal pieces in such a manner that only a flat surface of the resin shield portion is exposed out of the opening of the recess to outside.

Growing community of inventors

Chita-gun, Japan

Naoki Yamamoto