Nissan Motor Company Limited

Renault S.a.s.

Hiromu Terai

Hiroyuki Suzuki

Tomoyuki Nakano

Ryohey Toyota

Kouhei Toyohara

Akira Takano

Takeshi Watanabe

Atsushi Teraji

Morihiro Nagamine

A hybrid vehicle has an engine (E) that is capable of changing a combustion mode between a stoichiometric combustion mode and a lean combustion mode and a motor/generator (MG) that is capable of performing torque assist by a power running operation and torque absorption by a regenerative operation. As a boundary between a stoichiometric combustion operating region and a lean combustion operating region, a second boundary (L) at a torque decrease has a hysteresis at a low torque side with respect to a first boundary (L) at a torque increase. Upon shift from the stoichiometric combustion operating region to the lean combustion operating region, for delay in increase of an intake-air quantity, decrease in fuel and the torque assist by the motor/generator (MG) are carried out, and an exhaust air-fuel ratio is changed stepwise.

Method and device for controlling hybrid vehicle

An object of the present invention is to provide a continuously variable transmission in which a magnitude relationship between a piston area of a primary pulley and a piston area of a secondary pulley is specified. As means for achieving the object, a continuously variable transmission includes: an electric oil pump disposed in an oil path between a piston oil chamber of a primary pulley and a piston oil chamber of a secondary pulley; and a controlling portion configured to control the entry and exit of oil in the piston oil chamber of the primary pulley by the electric oil pump. A piston area of the primary pulley in the continuously variable transmission is smaller than a piston area of the secondary pulley.

Continuously variable transmission

A method for controlling a continuously variable transmission is a control method for controlling in/out of oil to/from a primary oil chamber by using an oil pump provided in an oil passage between the primary oil chamber and a secondary oil chamber. The method for controlling the continuously variable transmission includes: a current command value calculation step of calculating a current command value for the oil pump in accordance with an operating state; a current limiting step of limiting the current command value to a lower-limit current at which belt slip does not occur when an oil pressure in the primary oil chamber falls below a lower-limit oil pressure in the primary oil chamber at which the belt slip does not occur; and a pump control step of driving the oil pump by using the current command value to control a piston position of the primary oil chamber.

Continuously variable transmission and method for controlling continuously variable transmission

A method for controlling a continuously variable transmission including a primary oil chamber, a secondary oil chamber, an oil pump provided in an oil passage between the primary oil chamber and a secondary oil chamber. The method including determining whether a required downshift speed is faster than an allowable value; setting a target piston position of the primary oil chamber; setting a target oil pressure of the primary oil chamber; and increasing priority of a position feedback control based on the target piston position in the setting of the target piston position when it is determined that the downshift speed is slower than the allowable value and increasing priority of a hydraulic feedback control based on the target oil pressure in the setting of the target oil pressure when it is determined that the downshift speed is faster than the allowable value.

Method for controlling continuously variable transmission and continuously variable transmission system

A control method of a continuously variable transmission includes supplying oil pressure to a secondary pulley oil chamber by a source pressure oil pump, and controlling a flow of oil into and from a primary pulley oil chamber by an electric oil pump arranged in an oil passage between the primary pulley oil chamber and the secondary pulley oil chamber. After start-up of the source pressure oil pump, an operation of the electric oil pump is restricted until the oil is filled in the oil passage on the secondary pulley oil chamber side of the electric oil pump. The operation of the electric oil pump is permitted when rotation speed of the electric oil pump reaches a predetermined rotation speed.

Control method and control device of continuously variable transmission

A continuously variable transmission control method for controlling entry and exit of oil in a primary pulley oil chamber by an electric oil pump disposed in an oil path between the primary pulley oil chamber and a secondary pulley oil chamber, the control method including: comparing a temperature of the electric oil pump with a first threshold; and restricting a shift amount of a continuously variable transmission when the temperature of the electric oil pump is higher than the first threshold.

Continuously variable transmission control method and continuously variable transmission system

A control method of a continuously variable transmission includes supplying oil pressure to a line-pressure oil passage and a secondary pulley oil chamber by a source pressure oil pump, controlling a flow of oil into and from a primary pulley oil chamber by an electric oil pump arranged in an oil passage between the primary pulley oil chamber and the secondary pulley oil chamber, and limiting a discharge flowrate of the electric oil pump to an amount smaller than a discharge flowrate of the source pressure oil pump.

A method for controlling a continuously variable transmission is a control method of controlling in/out of oil to/from a primary oil chamber by using an oil pump provided in an oil passage between the primary oil chamber and a secondary oil chamber. The method includes: an abnormality determination step of determining whether rotation of the oil pump is abnormal; and when it is determined that the rotation is abnormal in the abnormality determination step, a hydraulic control step of making a secondary oil pressure higher than a pressure before the determination of abnormality.

A continuously variable transmission includes a variator having a primary pulley that has a primary oil chamber, a secondary pulley that has a secondary oil chamber, and a belt looped over the primary pulley and the secondary pulley, wherein secondary pressure is supplied to the secondary oil chamber, an oil pump provided in an oil passage that provides communication between the primary oil chamber and the secondary oil chamber, and a controller. The oil pump is configured to control an inflow and an outflow of oil of the primary oil chamber. The oil pump is formed by a gear pump. The continuously variable transmission controls the oil pump in such a manner that a target speed ratio of the variator is achieved.

Continuously variable transmission and control method of continuously variable transmission

A continuously variable transmission has a primary pulley hydraulic chamber, a secondary pulley hydraulic chamber, a first oil passage connected to the secondary pulley hydraulic chamber, a second oil passage connected to the primary pulley hydraulic chamber, the second oil passage branching from the first oil passage, an electric oil pump provided on the second oil passage so as to allow oil to flow into and flow out from the primary pulley hydraulic chamber, and an oil discharge mechanism configured to discharge oil outside the second oil passage, the oil being to be supplied to the primary pulley hydraulic chamber by the electric oil pump.

Continuously variable transmission and control method thereof

A twin-clutch manual gearbox has a first input shaft and a second input shaft to which engine rotation is selectively input via individual clutches. The second input shaft is rotatably fitted onto the first input shaft so that the first input shaft protrudes from an end of the second input shaft farthest from the engine. First gearsets are located between the protruding end of the first input shaft and a layshaft located between the first and second input shafts. Second gearsets are located between the second input shaft and the layshaft. The second gearsets are positioned such that the gearset of the lowest gearbox speed which is capable of providing a bearing retaining space between the first input shaft and the second input shaft is positioned farthest from the engine, and the gearset of the highest gearbox speed is positioned closest to the engine.

Growing community of inventors

Kanagawa, Japan

Hiromu Terai