Toyota Jidosha Kabushiki Kaisha

Shouji Abo

Koichi Mizutani

Yoshitaka Ojima

Hironobu Kusafuka

Yusuke Moritani

Kan Ohtsuka

Yoshitaka c/o Toyota Tech Dev Corp Ojima

Yusuke c/o Toyota Tech Dev Corp Moritani

A voltage raising device that provisionally maintains an operation and function when there is an abnormality provided. If a battery voltage drops when an engine is restarted after an idle stop, the voltage raising device raises the output voltage to a target voltage by using a voltage detecting circuit and a current detecting circuit. If an overcurrent determining circuit detects overcurrent, a switching control circuit reduces the target voltage to perform a control. If overvoltage is output, for example, due to an increased target voltage caused by an internal setting deviation resulting from a failure, an overvoltage detecting circuit outputs a prohibition signal ENV to stop the switching operation. However, as long as the output voltage is not overvoltage, the voltage raising operation is allowed. Therefore, the possibility that the engine can be started at least once without a problem is increased.

Voltage generator device, motor vehicle, control method for the voltage generator device, control method for the motor vehicle, and computer-readable recording medium storing program for causing computer to execute the control method

A power supply control system for a vehicle that is provided with a lead-acid battery with comparatively high output density and low energy density, and a lithium-ion battery with comparatively low output density and high energy density. On an engine start that accompanies an ignition operation of a vehicle operator, power is supplied to a starter from the lead-acid battery and the engine is started. On an engine restart that accompanies an idling stop control, power is supplied to the starter from the lithium-ion battery and the engine is started.

Power supply control system for vehicle and method

The voltage of 36-V battery () is dropped by the DC&#x2014;DC converter () to charge the 12-V battery (). The switching ON/OFF of the DC&#x2014;DC converter () is feed forward controlled by the controlling portion (). This can cope with the voltage change at the 36-V battery (). The output voltage of the DC&#x2014;DC converter () is feed back controlled by a differential amplifier () and PID () and feed back by the controlling portion ().

DC-DC converter with feed-forward and feedback control

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Toyota, Japan

Shouji Abo