Toyota Jidosha Kabushiki Kaisha

Tomoko Shimana

Makoto Nakamura

Takaya Soma

Kenji Yamada

Hiroyuki Tsukashima

Koichi Sakata

Shinjiro Ashida

Hirotaka Kamijo

Hironari Kimura

A failure detection device for a vehicle that detects a failure of a motor system includes a controller that changes a sensitivity for detection of a failure in the motor system in accordance with at least one of an operational condition of the motor system and a situation in which the motor system is operating.

Failure detection device for vehicle

After a collision has been detected, all the upper arm transistors of inverters () are turned off, and all the lower arm transistors of the inverters are turned on. Then, when no counter electromotive force is generated in any one of motors (MG, MG), a gate voltage (V) lower than a gate voltage (V) at which each upper arm transistor completely turns on is applied to at least any one of the upper arm transistors of the inverters (), and at least any one of the lower arm transistors of the inverters (), which is serially connected to the at least any one of the upper arm transistors to which the gate voltage (V) is applied, is turned on.

Vehicle and control method therefor

An electric vehicle includes: a motor to propel the electric vehicle; a secondary battery that exchanges power with the motor via a power line; a capacitor that is connected to the power line; a collision detection unit that detects a collision of the electric vehicle; a rotation speed detection unit that detects a rotation speed of the motor; and a control unit that, when a collision of the electric vehicle is detected and the detected rotation speed of the motor equals or exceeds a predetermined rotation speed, controls the motor such that the rotation speed of the motor falls below the predetermined rotation speed and then executes discharge control to discharge the capacitor.

Electric vehicle, and control apparatus and control method for electric vehicle

A vehicle drive apparatus includes a battery that is a direct current power source, a converter that increases the voltage of the battery, an inverter connected to a motor that drives the vehicle, an inverter connected to a motor generator that functions as a motor or generator, and a motor control device that controls the motor. The vehicle drive device is also provided with a voltmeter, non-energized state determination devices that determine a non-energized state of the inverters, and ammeters that detect currents applied to a motor from each phase arm of the inverters. Signals of these devices and a signal from the non-energized state determination device are sent to the motor control device.

Short circuit phase identification method

If any short-circuit failure occurs in an inverter, then a motor generator is used to execute a safety driving. If the rotational speed of a motor generator calculated from a detection value of a position sensor exceeds a predetermined reference rotational speed during the safety driving, an MGECU turns on all of the switching elements connected in parallel to a switching element in which a short-circuit failure occurs with respect to a power supply line. If the rotational speed is equal to or less than the reference rotational speed, the MGECU turns on only the switching elements connected in series to the switching element in which the short-circuit failure occurs. In this way, any excessive currents can be prevented from occurring in the inverter without restricting the safety driving.

Growing community of inventors

Nisshin, Japan

Tomoko Shimana