Toyota Jidosha Kabushiki Kaisha

Toyoda Jidosha Kabushiki Kaisha

Kouta Manabe

Tetsuhiro Ishikawa

Nobuo Watanabe

Hiroshi Sugiura

Hiroyuki Imanishi

Nobuyuki Kitamura

Kenichi Hamada

In order to assure drive of a drive motor, a boost operation of a boost device is appropriately performed by judging whether a voltage supplied from a fuel cell suffices a voltage required for driving the drive motor, thereby suppressing a switching loss by the boost device. A fuel cell system is a power source for driving a load. The system includes: a drive motor driven by an electric power; a fuel cell which generates electricity by an electrochemical reaction between an oxidizing gas containing oxygen and a fuel gas containing hydrogen and supplies an electric power to the drive motor; a first boost device which can boosts the voltage outputted from the fuel cell and supplies the boosted voltage to the drive motor; and boost control means which controls voltage boost performed by the first boost device according to the relationship between the fuel cell output voltage and the voltage required by the drive motor.

Fuel cell system

An output characteristic of a fuel cell is estimated by detecting an output current of the fuel cell and a voltage between terminals of the fuel cell, and then estimating the output characteristic of the fuel cell on the basis of the detected output current and the detected voltage between the terminals, and a basic output characteristic of the fuel cell.

Fuel cell output characteristic estimation apparatus and output characteristic estimation method, fuel cell system and vehicle having the same, and fuel cell output control method and data storage medium

A power source system () includes a fuel cell () and a battery () connected in parallel. A DC-DC converter () is connected to the battery () side. A maximum output ratio of the fuel cell () and the battery () is set in a range in which the output of the fuel cell falls within 65 to 80% of the total output. Accordingly, electric power loss due to the DC-DC converter () is controlled, whereby a high energy efficiency can be achieved.

DC power source with fuel cell and electric power storage device

A power supply system includes a fuel cell and a battery connected in parallel. A DC-DC converter is connected to the battery. A maximum output ratio of the fuel cell and the battery is set to be in a range where the output of the fuel cell is within 65 to 80% of the total output. Accordingly, electric power loss owing to conversion performed by the DC-DC converter is reduced to achieve a high energy efficiency.

Growing community of inventors

Gold River, CA, United States of America

Kouta Manabe