Nissan Motor Company Limited

Takashi Tsuneyoshi

Yutaro Kaneko

Shinichiro Kitada

Toshio Kikuchi

Toshikazu Oshidari

Yuki Nakajima

Tomoya Imazu

Shinichiro Joe

Hiroyuki Itoyama

Minoru Arimitsu

Shojiro Sato

A method for starting an engine of a vehicle having a hybrid transmission is provided. The hybrid transmission is capable of providing motor running under a power of an electric motor only and hybrid running under a power of both of the engine and the electric motor. The power of an engine is supplied to the hybrid transmission by way of a clutch. The method includes, when the clutch is engaged for starting the engine during the motor running, issuing an engine start instruction when an engine speed increases to a startable speed with the progress of engagement of the clutch, and after the moment of issue of the engine start instruction, restricting increase of an engagement force of the clutch and thereby suppressing the progress of engagement of the clutch. An apparatus for carrying out the method is also provided.

Method for starting engine of vehicle with hybrid transmission and apparatus for carrying out the method

In method and apparatus for engaging an engine clutch for a hybrid transmission, a complete engagement of the engine clutch while at least one of an engine side clutch revolution speed of the engine clutch and a transmission side clutch revolution speed thereof is a revolution speed within a resonance revolution speed region of a revolution transmission system from the engine to a transmission revolution output portion is inhibited and the complete engagement of the engine clutch is carried out when both of the engine side clutch revolution speed of the engine clutch and the transmission side clutch revolution speed thereof become higher than the revolution speed within the resonance revolution speed region.

Method and apparatus for engaging engine clutch for hybrid transmission

A cooling structure and a rotating electric machine with the cooling structure are provided. The cooling structure produces sufficient reductions in the temperature of the stator core while at the same time not causing a large reduction in the output of the rotating electric machine. The rotating electric machine is provided with a first cooling medium passage formed in the slot. In addition, a second cooling medium passage is provided which extends in parallel to the first cooling medium passage and allows flow of the same cooling medium as the first cooling medium passage. The stator core comprises at least a section of the passage wall of the second cooling medium passage. The second cooling medium passage is disposed so that the second cooling medium passage does not impede the flow of magnetic flux in the stator core.

Rotating electric machine and cooling structure for rotating electric machine

A motor/generator () comprises a permanent magnets () having a V-shaped surface projecting in the center of a rotor (). These permanent magnets () are disposed so that the V-shaped surface faces the center of the rotor (). In this way, the permanent magnets () are prevented from sliding on the fitting surfaces () of the insertion holes (), and the permanent magnets () can be fixed at predetermined positions. Further, magnetic losses caused by the rotor () can be reduced, and efficiency of the motor/generator can be improved.

Permanent magnet motor/generator

A stator for a rotary electric machine is provided to curb decreases in output caused by magnetic flux leakage. The stator has a stator core with stator coils that are wound around tooth parts of the stator core. The tooth parts of the stator core are arranged to form a rotational space with respect to a rotor, and housed inside the slots and cooling medium passages are formed inside the slots by blocking the openings of the slots. The protrusions are provided that protrude into the slots from both lateral surfaces of the tips of the tooth parts. The plates formed with grooves on both sides thereof that fit on the tips of the protrusions are arranged between adjacent ones of the protrusions so as to block the openings of the slots. A sealing member is formed on the rotor side of the plates.

Stator structure for rotary electric machine

A rotating electric machine using an inner section of a slot of a stator as a cooling passage obtains highly effective cooling performance with a small amount of cooling medium. An opening for a slot in a stator is closed by an under plate having a closing member. A regulating plate is disposed which is a member for regulating the cross-sectional area of the passage in substantially a central section of the slot. In this manner, the cross-sectional area of the cooling passage with the plate in the slot is smaller than the cross-sectional area when the regulating plate is not provided by an area corresponding to the cross-sectional area of the regulating plate. This arrangement allows increases in cooling efficiency.

Rotating electric machine

A motor or a generator which has permanent magnets on a moveable member effectively reduces eddy current loss in the permanent magnets. A permanent magnet which is provided for the moveable member of a motor or a generator, for example the rotor of a rotating motor, is divided into magnet sections ( A- E) having divided widths (t -t ) in response to the rate of change in the flux density in each divided magnet. Thus the eddy current loss in each magnet section ( A- E) can be substantially equalized.

Motor or generator

This invention provides a rotating electric machine using an inner section of a slot of a stator as a cooling passage and allowing a high cooling efficiency. Furthermore, it provides a manufacture method for the rotating electric machine which allows streamlining of the manufacture of the cooling passage. A plate is attached to the plate retaining groove formed in proximity to the opening of the slot of the stator. A resin layer is formed by injection of resin into a space formed between the outer face of the plate and the mold set on an inner peripheral face of the stator. The plate is pressed by the injection pressure of the resin to come into close contact with the stopper and to create a seal which prevents leakage of resin into the slot. A leg is provided on the plate and extends into the slot for reducing the cross sectional surface area of the cooling passage.

Rotating electric machine and method of manufacture therefor

A stator structure is provided with a stator core having a plurality of cooling passages or slots and an annular resin layer formed on an inner peripheral surface of the stator core that defines a rotor receiving opening. The stator core has a plurality of protrusions disposed on the inner peripheral surface of the stator core to control the depth of the annular resin layer formed on the inner peripheral surface of the stator core. The protrusions have radial thicknesses that are substantially equal to the radial thickness of the annular resin layer.

An annular member is fitted to the outer periphery of the stator cores in a rotating electric machine. The rotating electric machine has a cooling passage in an axial direction between a resin molded section and adjacent stator cores The annular member is formed from a material which has a larger coefficient of linear expansion than the magnetic material comprising the stator cores. At low temperatures, stress resulting from the differential between the coefficient of linear expansion of the stator core and the resin molded section is reduced because an inward compressive force is applied to the stator core by the annular member as a result of the difference in the coefficient of linear expansion.

This invention prevents leakage of cooling medium from a cooling passage in the interior section of a slot of a stator. Coils are housed in the slot of the stator core. The openings of the slot are covered in order to form a cooling passage in the slot. An end plate is disposed on the end of the stator. The stator core and the end plate are integrated by winding coils through the outer side of the end plate. A cylindrical member which projects along the inner peripheral face of the stator from the end of the stator is formed by resin molding to be integrated with a section of the end plate. A ring-shaped space which introduces cooling medium is formed on an outer peripheral side of the cylindrical member and is connected with the cooling passage.

Rotating electrical machine

Even when an engine rotates in the inverse direction immediately before stopping, the engine can be accurately activated. In an engine which injects fuel sequentially on the basis of an ignition order of each cylinder, a crank angle of the terminal position of the engine is stored. On the first fuel injection timing after engine activation, fuel is simultaneously injected into a cylinder which is determined from the terminal stored position and into a cylinder in a fixed positional relationship with the first cylinder. In this way, even when an engine rotates in the inverse direction immediately before stopping, fuel injection can be accurately performed at least on a cylinder into which fuel should be injected and the engine can be accurately activated.

Growing community of inventors

Yokohama, Japan

Takashi Tsuneyoshi