Toyota Jidosha Kabushiki Kaisha

Kabushiki Kaisha Toyota Jidoshokki

Ryoji Oki

Eiji Sato

Masayuki Komatsu

Makoto Nakamura

Sumikazu Shamoto

Toshihiro Katsuda

Yoshinobu Sugiyama

Wanleng Ang

Yoshiyuki Nakamura

Junichi Takeuchi

Hidenori Takahashi

Eiji Yanagida

Masayuki Furutani

A first opening/closing device is connected between a power storage device and a first pair of power lines. A second opening/closing device is connected between the power storage device and a second pair of power lines. A third opening/closing device opens and closes an electric conduction path between the power storage device and each of the first opening/closing device and the second opening/closing device. When starting to externally supply electric power, a control device charges a first capacitor connected between the first pair of power lines by closing the first opening/closing device and the third opening/closing device, and thereafter charges a second capacitor connected between the second pair of power lines by closing the second opening/closing device and opening the third opening/closing device.

Power source system, vehicle including same, and method for controlling power source system

When charging each electric power storage device from a power supply external to a vehicle is requested, then before each electric power storage device is charged the electric power storage devices charge/discharge therebetween. A battery ECU calculates a voltage-current characteristic of each electric power storage device, as based on each electric power storage device's voltage and current collected when the electric power storage devices charge/discharge therebetween. Each electric power storage device's OCV is calculated as based on the calculated voltage-current characteristic, and each electric power storage device's SOC is estimated from the calculated OCV.

Electric-powered vehicle, method for estimating state of charge, and computer-readable storage medium having program stored therein for causing computer to execute method for estimating state of charge

When the temperature of an engine and a main battery is low at the time of activating a vehicle system, an ECU starts the engine in advance and outputs a running permission signal after completion of engine startup. At this stage, the ECU suspends a defect diagnosis operation on a subsidiary load and feedback-controls the DC/DC converter by setting the voltage control value to a level lower than the output voltage from the subsidiary battery and at least the lower limit of the operating voltage of the ECU. The ECU feedback-controls the DC/DC converter by setting the voltage control value to a level of at least the output voltage of the subsidiary battery in response to completion of engine start-up. Then, the suspension of the defect diagnosis operation on the subsidiary load is canceled and a running permission signal is output.

Power supply control apparatus and method for hybrid vehicle

An electric load apparatus () includes a DC power source (B), a voltage sensor (), system relays (SR, SR), a capacitor (), a DC/DC converter (), an inverter (), a current sensor (), a rotation sensor (), a control apparatus (), and an AC motor (M). The control apparatus () restricts an increase amount of consumed power in the AC motor (M) in a range in which the driving operation of the electric load apparatus () can be maintained, when the increase amount of the consumed power in the AC motor (M) exceeds an allowable power that can be supplied from the capacitor () to the inverter ().

Electric load apparatus, electric load controlling method and computer readable recording medium recording program for causing computer to execute control of electric load

In regenerative braking mode, an inverter converts, according to PWMC signal from a control unit, an AC voltage generated by a motor into a DC voltage to supply the converted DC voltage to an up-converter which down-converts the DC voltage to charge a DC power supply. The control unit receives voltage Vfrom a voltage sensor to stop the up-converter if voltage Vis higher than a predetermined value. The control unit further receives voltage Vf from a voltage sensor that is applied to a DC/DC converter and stops the up-converter if voltage Vf is higher than a predetermined value. Moreover, the control unit receives voltage Vof the DC power supply from a voltage sensor to stop the up-converter if voltage Vdoes not match voltage V

Load driver and control method for safely driving DC load and computer-readable recording medium with program recorded thereon for allowing computer to execute the control

An internal combustion engine start controller in a vehicle that includes: a power source; an internal combustion engine that is started by using electric power supplied from the power source; a first motor; and a first electric power converter that is constructed so as to be able to perform electric power conversion between the power source and the first motor through switching control of power semiconductor elements is provided. The start controller includes: a start detecting device for detecting whether the engine is in a starting operation; and a first frequency setting device that, when the engine is in a starting operation, sets a switching frequency of the first electric power converter to a frequency lower than that used when the engine is not in a starting operation.

Internal combustion engine start controller

On end of a reactor (L) is connected to a positive electrode of a battery (B) and the other end is connected to a power line via a transistor (Q) and to the ground via a transistor (Q). By PWM control of the transistors (Q, Q), an arbitrary increased voltage is obtained in the power line. It is possible to obtain an optimal inverter input voltage (power line voltage) according to the motor drive state, thereby increasing efficiency. Thus, it is possible to optimize the inverter input voltage according to the motor drive condition.

Motor drive control apparatus

A power plant outputs motive power by driving a motor () using electric power from a direct-current power source (). When the direct-current power source () has a low temperature, the direct-current power source is rapidly heated, whereby the performance can fully be demonstrated. In the power plant in which a capacitor () is installed so as to connect a positive electrode bus () and a negative electrode bus () of an inverter circuit () and the direct-current power source () is also installed so as to connect the negative electrode bus () of the inverter circuit () and a neutral point of the motor (), when a power source temperature (Tb) of the direct-current power source () detected by a temperature sensor () is less than or equal to a threshold temperature (Tblow) at which supply of required electric power to the motor () is possible, an electronic control unit () sets a voltage between terminals of the capacitor () higher than normal and also sets a frequency of a carrier wave lower than normal, and performs switching control of transistors (Tto T) Thus, a ripple of a neutral point current which flows into the direct-current power source () can be increased, whereby it is possible to promote calorification of the direct current power source ().

POWER OUTPUTTING DEVICE AND VEHICLE MOUNTING IT, CONTROL METHOD, STORING MEDIUM AND PROGRAM FOR THE POWER OUTPUTTING DEVICE, DRIVE DEVICE AND VEHICLE MOUNTING IT, AND, CONTROL METHOD, STORING MEDIUM AND PROGRAM FOR THE DRIVE DEVICE

An electronic control unit () calculates the current flowing through a reactor (L) by dividing an output required BP* of a battery (), obtained from converting the power required by a motor (), by a terminal voltage Vb of the battery (). A carrier frequency (optimum carrier frequency) is set for transistors (T, T) where the loss of a DC/DC converter () is minimized from the calculated current, and the DC/DC converter () is controlled at the set switching frequency.

Drive apparatus, control method for the drive apparatus, storage medium storing a program controlling the drive apparatus, and power output apparatus

When voltage at the main battery 10 is lowered, an EV-ECU 36 instructs a starting motor 24 to rotate to actuate an engine 26 for the initiation of power generation. At that time, the starting motor receives electric current mainly from a power capacitor 34, while an auxiliary battery 22 is connected to the ECU 36 and an ECU 38 so that supply voltages at the ECU's 36 and 38 can be kept at a predetermined level irrespective of the drive of the starting motor 24. Also, when the upstream voltage of the auxiliary battery 22 is found to be less than a predetermined value through a comparator 40, the drive of the starting motor is not effected. This configuration prevents the voltage at the auxiliary battery 22 from continuing to be lowered due to the drive of the starting motor 24 in the case where the power capacitor 34 is in a poorly charged state.

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Toyota, Japan

Ryoji Oki