Toyota Jidosha Kabushiki Kaisha

Kabushiki Kaisha Toyota Chuo Kenkyusho

Yasutomo Kawabata

Eiji Yamada

Tetsuya Miura

Takao Miyatani

Akihiko Kanamori

Ryuji Toh

Ryouji Mizutani

Shigeru Matsuhashi

Satoshi Koide

Yoshiaki Taga, Deceased

Masaru Hirako

Shoichi Sasaki

Takeshi Kotani

Masatoshi Uchida

Shigetaka Nagamatsu

Shigeo Taga, Heir

Yoshiaki Taga

Hiroaki Urano

Yukio Inaguma

Norihiko Akao

Tomoharu Maeda

Yoshihide Nii

Masanao Shiomi

Masayuki Nakamura

Yasuhiko Ishimaru

Nobuyoshi Takagi

Toshinobu Arakawa

Masahiro Nishioka

Takiko Taga, Heiress

Katsuhisa Endo

Yutaka Taga

Ryoji Mizutani

Yasushi Kusaka

Akio Fukui

Tetsuya Sugimoto

Akihiro Yamanaka

Tetsuya Abe

Kaoru Kubo

Hidetsugu Hamada

Tomohiro Oda

Shinji Kogure

Kyomi Shimada

Hirosumi Suzuki

Hiroshi Suga

Tomoyo Taga, Heir

Takiko Taga, Heir

Hideshi Ohya

By Shigeo Taga, Heir

By Takiko Taga, Heir

By Tomoyo Taga, Heiress

Keiji Kawamura

Tomoyo Taga, Heiress

Jiro Eto

Shigeru Matuhashi

Yoshiaki (deceased) Taga

A power output apparatusincludes a clutch motor, an assist motor, and a controller. The clutch motor and the assist motor are controlled by the controller to enable the power output from an engine to a crankshaft, and expressed as the product of its revolving speed and torque, to be converted to the power expressed as the product of a revolving speed and a torque of a drive shaft and to be output to the drive shaft. The engine can be driven at an arbitrary driving point defined by a revolving speed and a torque, as long as the energy or power output to the crankshaft is identical. A desired driving point that attains the highest possible efficiency with respect to each amount of output energy is determined in advance. In order to allow the engine to be driven at the desired driving point, the controller controls the clutch motor and the assist motor as well as the fuel injection and the throttle valve position. Such control procedures of the power output apparatus enhance the energy efficiency of the whole power output apparatus.

Power output apparatus, method of controlling power output apparatus, and driving system with power output apparatus incorporated therein

A circular wire with a circular cross section is wound on a coil reel. When a winding-form motor rotates a winding form, the circular wire is pulled and drawn from the coil reel. Rectangular forming rollers press the circular wire, so that a rectangular wire with a rectangular cross section is formed. The rectangular wire is directly wound on the winding form to be formed into a rectangular-wire coil. Because forming rectangular wire and winding on the winding form are carried out in a sequence of contiguous processes, a separate process for removing torsion set of the rectangular wire is unnecessary. The rectangular-wire coil can be formed from inexpensive circular material wire by a simple and low-cost apparatus. It is also possible and preferable to make dimensions and a shape of the rectangular wire variable by controlling clearance widths between the forming rollers and tension acting on the rectangular wire that has passed through the rollers.

Method for manufacturing a rectangular-wire coil

A power outputting apparatus is provided with an engine, a clutch motor connected to a crank shaft thereof, and an assist motor connected to the crank shaft or a drive shaft by a switch apparatus. At a time of moving a vehicle backward, an operation characteristic of the engine is set to a characteristic on a low torque side in place of a characteristic at a time of moving forward (a characteristic giving priority to an efficiency). In addition, a torque Tm larger than an engine torque Te and in a reverse direction is output from the assist motor. As a result, a high torque is output to the drive shaft while an electric power is regenerated by the clutch motor, whereby the vehicle can be backward moved.

Power transmission apparatus and four wheel drive equipped with the same

The technique of the present invention sets a torque voltage to be applied to a motor in response to a required torque and adjusts the duty of an inverter to ensure application of the torque voltage according to the observed voltage of a battery. In a motor controller constructed to attain such control, before a start-up of normal operation of the motor, a fixed duty is set for switching the inverter to apply a voltage to the motor. The value of electric current running in response to the applied voltage is measured. The mapping of the value of electric current to the source voltage in the case of switching the inverter at a fixed duty is stored in advance in the form of a table. The procedure reads the true value of the source voltage from the table and thereby specifies an offset error occurring in a voltage sensor of the battery. The procedure then corrects the observed voltage of the battery and adequately regulates the torque voltage.

Motor control apparatus and control method

A method of controlling a power output apparatus including an engine, a drive shaft, first and second electric motors and a coupling device is provided. When a hybrid vehicle starts from rest, ECU operates to run the vehicle in EV mode only by means of one of the electric motors. When the operating point of the drive shaft passes a boundary that separates the underdrive region from the overdrive region, and enters the overdrive region, fuel supply to the engine is started so as to start the engine, and the coupling device is controlled so that coupling of the rotary shaft of the second electric motor is switched from the first coupling state in which the rotary shaft is coupled with the drive shaft to the second coupling state in which the rotary shaft is coupled with the output shaft of the engine. After switching, the ECU operates to run the vehicle in HV mode, utilizing the engine and the first and second electric motors.

Method of controlling power output apparatus

A rotor piece has a plurality of holes Each hole holds therein a plurality of substantially divided permanent magnets that are arranged in a circumferential direction. Therefore, each permanent magnet is small and the flow passage of eddy currents becomes narrow, so that the magnitude of eddy currents becomes small. The total eddy currents in all the permanent magnets is also reduced, so that the eddy current loss can be reduced and the heat generation of the motor can be reduced. Adjacent ones of the substantially divided permanent magnets may be interconnected at portions thereof. One or more of the substantially divided permanent magnets in one or more holes may be ferrite magnets, with other permanent magnets being rare-earth magnets.

Permanent magnet motor

In a power output apparatus of the present invention, a control unit sets a WOT (wide open throttle) line L , where the maximum torque of an engine attains, as a boundary between an over drive area and an under drive area in the case where a rotor shaft of an assist motor is set in a state of over drive linkage. The control unit determines a target working point of an outer rotor shaft of a clutch motor, which functions as a drive shaft, based on an externally required output, and selects the WOT line L as a performance line of the engine in the case where the target working point of the outer rotor shaft is present in the under drive area. The control unit then sets a switching instruction flag, in order to change the state of linkage of the rotor shaft of the assist motor from the state of over drive linkage to a state of under drive linkage. This arrangement of the invention reduces the maximum load capacity of the assist motor and decreases the maximum electric current of an inverter circuit for driving the assist motor.

Power output apparatus and method of controlling the same

Apparatus for manufacturing a rectangular-wire coil

Electrical angle detecting apparatus and method, and motor control apparatus

A power output apparatus 20 implements a smooth switching between the connection of a rotor-rotating shaft 38 of an assist motor 40 with a crankshaft 56 of an engine 50 and the connection of the rotor-rotating shaft 38 of the assist motor 40 with a drive shaft 22, and enables the power output from the engine 50 to be output to the drive shaft 22 with a high efficiency. The power output from the engine 50 is converted to a desired power by a clutch motor 30 having rotors 31 and 33 respectively linked with the crankshaft 56 and the drive shaft 22 and by the assist motor 40 connected to either the crankshaft 56 or the drive shaft 22 via a first clutch 45 and a second clutch 46, and is output to the drive shaft 22. The connection of the assist motor 40 is switched in the state where both the clutches 45 and 46 are set in ON position, when the revolving speed of the engine 50 is made coincident with the revolving speed of the drive shaft 22. This effectively reduces a variation in torque output to the drive shaft 22 in the course of the switching operation and enables the power to be output to the drive shaft 22 even in the course of the switching operation.

Power output apparatus and method of regulating power

Power output apparatus, method of controlling power output apparatus,

A stator core for a motor in which a member with rounded edges is used to prevent the electrical breakdown of the winding of a coil which may occur at a slot edge therein. End plates 18 are disposed on ends of the stator core 10 formed of laminated magnetic steel plates 12. Each of the end plates 18 has substantially the same pattern as each magnetic steel plate 1, viewed from the axis of the motor. The elongate surface 18a of the end plate 18 continues smoothly from the inner surface 16a of each of slots 16 to the rounded edge surface 18b. The rounded edge surface extends smoothly from the elongate surface 18a to the end surface 18c of the end plate 18. This structure can eliminate sharp edges from the fringe of the slot 16, thus preventing the electrical breakdown of a coated conductor 22 in the coil which may occur at the edges.

Stator for electric motor

The conventional technique can not detect the electrical angle of a synchronous motor in a sensor-less manner when a high torque is required under the condition of a low-speed operation of the motor. The direction that passes through the axis of rotation of the motor and causes a magnetic flux to pass through a permanent magnet is defined as a d axis, whereas the direction that is electrically perpendicular to the d axis in the plane of rotation of the motor is defined as a q axis. In the case where the motor is required to output a high torque, the technique of the present invention applies a predetermined detection voltage to the q axis and determines the electrical angle based on the ratio of electric currents flowing through the d axis and the q axis. Application of a negative voltage to the q axis relieves magnetic saturation occurring on the q axis under a high torque condition and thereby allows detection of the electrical angle. When a positive voltage is applied to the q axis, on the other hand, the technique of the present invention refers to a table which is stored in advance to represent the one-to-one mapping of the electrical angle to the electric current flowing through the q axis, and thereby determines the electrical angle.

Electrical angle detection apparatus, method of detecting electrical

When there is a change in required torque, the prior art technique may cause the undesirably low accuracy in the sensor-free determination of the electrical angle. A motor controller of the present invention has the following configuration to control the operation of a synchronous motor, in which multi-phase alternating currents flow through coils to rotate a rotor. The motor controller includes an electrical angle determination unit, which applies a voltage for determination to the coils and determines the electrical angle of the rotor in a sensor-free manner, based on the electric currents flowing in response to the applied voltage for determination. The motor controller also has a torque control unit that applies a voltage for torque output to the coils, corresponding to the required torque. An adjustment unit included in the motor controller adjusts the execution timings of the electrical angle determination unit and the torque control unit, so as to prevent the variation in electric current by the torque control unit from affecting the execution of the electrical angle determination unit. One possible procedure schedules the execution timings of the electrical angle determination unit and the torque control unit. Another possible procedure causes the execution of the electrical angle determination unit to wait according to a variation in required torque. This arrangement enables the electrical angle to be determined with a high accuracy even in the case of a torque variation.

Motor controller and method of controlling motor

When a required torque increases under the condition of high-speed rotation, the conventional technique can not detect an electrical angle or control a synchronous motor in a sensor-less manner. The direction that passes through the rotating axis of the motor and makes a magnetic flux run through a permanent magnet is defined as the d-axis, whereas the direction that is electrically perpendicular to the d-axis in the rotational plane of the motor is defined as the q-axis. The technique of the present invention applies voltages to the d-axis and the q-axis based on an estimated electrical angle and solves voltage equations with the observed electric currents. The technique then calculates a correction amount of the electrical angle according to errors of the arithmetic operations and controls the motor. The arithmetic operations are carried out by varying the inductance according to the required torque of the motor. One concrete procedure determines the inductance corresponding to a specific motor driving state by interpolation of the table that stores the inductances corresponding to a variety of motor driving states. Another concrete procedure substitutes the driving states at the respective time points into the function that represents the relationship between the inductance and the driving state, so as to determine the inductance.

Motor control apparatus and method of controlling motor

Growing community of inventors

Aichi-ken, Japan

Yasutomo Kawabata