Toyota Jidosha Kabushiki Kaisha

Denso Corporation

Takeshi Kishimoto

Masaya Amano

Takashi Ando

Yu Shimizu

Nobuyuki Tanaka

Shinichiro Minegishi

Yuki Hayakawa

Wataru Nagashima

Tomoyuki Shibata

Kouji Miyazaki

Mitsuhiro Matsumura

A hybrid vehicle may include an engine, a first rotating electric machine, an output shaft, a planetary gear mechanism, a second rotating electric machine, a battery, an inverter and an electronic control unit. The electronic control unit may be programmed to perform inverterless traveling control. The inverterless traveling control may be control for causing the hybrid vehicle to travel by placing the inverter in a gate cut-off state, and driving the engine. The electronic control unit also may be programmed to interrupt current flowing between the first rotating electric machine and the battery when a shift range other than a forward range is selected, during the inverterless traveling control.

Hybrid vehicle

A vehicle includes an engine, an MG (motor generator), an MG, a planetary gear device mechanically coupled to the engine and MGand MG, a battery, a converter configured to boost a voltage from the battery, an inverter configured to perform a power conversion between the converter and MGor between the converter and MG, and a controller. MGgenerates a counter-electromotive voltage when rotated by the engine, and a braking torque is generated as the counter-electromotive voltage becomes greater than the output voltage of the converter. During an inverter-less running control where the inverter is put into a gate shut-off state and the engine is driven to cause MGto generate the counter-electromotive torque, the controller decreases a voltage difference between the counter-electromotive voltage and the output voltage of the converter when a chargeable power of the battery is lower than a predetermined value.

A vehicle includes an engine, an MG (motor generator) an MG, a planetary gear device mechanically coupled to the engine and MGand MG, a battery, an inverter configured to perform a power conversion between the battery and MGand between the battery and MG, and a controller. MGgenerates a counter-electromotive torque when rotated by the engine. During an inverter-less running control where the inverter is put into a gate shut-off state and the engine is driven to cause MGto generate the counter-electromotive torque, the controller decreases a engine target rotation speed Netag when an integrated value of battery charging current (deterioration evaluation value D) is greater than a predetermined value (threshold value D) smaller than the engine target rotation speed Netag when the deterioration evaluation value D is equal to or smaller than the threshold value D

Inverterless running control is control in which an inverter is set to a gate cut-off state, an engine is driven to mechanically rotate a motor-generator and to generate in the motor-generator, counter-electromotive torque in accordance with a difference between a counter-electromotive voltage of the motor-generator and a system voltage, and a vehicle runs with drive torque applied to an output shaft as reaction force of the counter-electromotive torque. An ECU controls drive torque to produce driving force determined by an accelerator position by raising or lowering the system voltage during inverterless running control.

Hybrid vehicle and method for controlling the same

When at least one of motor generators is not under normal control and where the MGtemperature is less than an upper limit value, an ECU is configured to perform an inverter-less running control. In the inverter-less running control, an inverter is brought into a gate shutoff state and an engine is driven to cause the motor generator to generate a counter-electromotive voltage which consequently produces a counter-electromotive torque. During the inverter-less running control, the ECU makes a voltage difference between the counter-electromotive voltage and the voltage of a power line connecting a converter and an inverter when the MGtemperature is equal to or greater than a predetermined value smaller than the voltage difference when the MGtemperature is less than the predetermined value.

An ECU performs control processing including setting an inverter to a gate blocking state when an abnormal condition of the inverter occurs, activating a converter, driving an engine, carrying out first suppression control when an abnormal condition of a resolver occurs and when an MGrotation speed immediately before occurrence of the abnormal condition is equal to or smaller than a first speed threshold value, and carrying out second suppression control when the MGrotation speed immediately before occurrence of the abnormal condition is greater than the first speed threshold value and when there is no record of stop.

Hybrid vehicle and method of controlling hybrid vehicle

When a malfunction occurs in communication between an HV-ECU and an MG-ECU, inverterless running is performed to ensure that a driving torque of a vehicle is applied, by setting inverters in a gate shutoff state and using a braking torque generated in a motor generator rotated by an engine. When the inverterless running resulting from the malfunction in communication is performed, the MG-ECU uses a converter to control a system voltage VH to a predetermined voltage. During the inverterless running resulting from the malfunction in communication, the HV-ECU sets an assumed power range of a battery based on a detected value regarding a vehicle running state and the predetermined voltage. When an actual electric power determined from the voltage and current of the battery is out of the assumed power range, the HV-ECU performs a process for stopping the vehicle from running.

A hybrid vehicle includes: an engine; a first motor; a planetary gear having three rotary elements that are connected respectively to a rotary shaft of the first motor, an output shaft of the engine, and a drive shaft coupled to an axle such that on a collinear diagram, the rotary shaft, the output shaft, and the drive shaft are arranged in that order; a second motor; a first inverter configured to drive the first motor; a second inverter configured to drive the second motor; a battery capable of exchanging power with the first and second motors via the first and second inverters; and an electronic control unit configured to control the engine such that a rotation speed of the engine increases at a predetermined time when the engine is operative, respective gates of the first and second inverters are both blocked, and an accelerator is ON.

An electric vehicle includes a control unit having overcurrent generation judgment unit, inverter selection unit, and inverter drive control unit. The overcurrent generation judgment unit judges whether an overcurrent is generated in an inverter for generation or an inverter for travel. When an overcurrent is generated in one of the inverters, the inverter selection unit selects the other inverter to be driven. The inverter drive control unit stops the driving of the one inverter and drives the other inverter to drive a travel motor or a generator.

Electric vehicle

A control system for a hybrid vehicle in which, even if during traveling of the hybrid vehicle, a battery defect arises in a high-voltage power source, battery-less emergency traveling can be achieved over a sufficiently long distance, and the steering assist force can be effectively prevented from changing rapidly during traveling. The control section includes high-voltage power source defect processing unit. During execution of a mode in which the high-voltage power source, is reduced so that the reduced voltage is supplied to an electric power steering device (EPS), when a defect occurs in the high-voltage power source, the high-voltage power source defect processing unit shifts to a mode in which the low voltage of a low-voltage power source is increased so that the increased voltage is supplied to the EPS. The high-voltage power source defect processing unit then disconnects the high-voltage power source and the driving circuit from each other.

Control system and method for hybrid vehicle

A device and method for determining whether a malfunction is present in a drive circuit, which drives an electric device that generates counter-electromotive force, when all gates in the switching elements of the drive circuit are blocked. After the gates are blocked, the temperature of the switching elements is monitored and the presence of a malfunction is determined based on the detected temperature of the switching elements. A malfunction is determined to be present when the detected temperature equals or exceeds a predetermined temperature; the change in the detected temperature equals or exceeds a predetermined value; or the rate of change in the detected temperature equals or exceeds than a predetermined rate. Thus, it can be appropriately determined whether the gates in the drive circuit are appropriately blocked and minimize the influence of any malfunctions on other elements outside of the drive circuit.

Malfunction determining device for drive circuit and drive unit including the same, and method for determining malfunction in drive circuit

A vehicle includes a direct current power supply (supply), an electric circuit (circuit) supplied with a current from the supply, a connector with relays that connects and disconnects a path supplying the current to the circuit, and a voltage sensor (sensor) that monitors the path between the connector and the circuit. A controller provides control to connect and disconnect the connector. The controller then brings part of the relays into conduction to provisionally determine conduction fault of a relay that is to be non-conductive in accordance with an output of the sensing portion. When a result indicates fault, the controller stores the sensor output as a first value, brings some relays out of conduction, brings other relays into conduction, and compares the value and the sensor output to determine whether to confirm the provisional determination. Thus, fault diagnosis time is reduced.

Growing community of inventors

Nagakute, Japan

Takeshi Kishimoto