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Jatco Ltd patents


Recent patent applications related to Jatco Ltd. Jatco Ltd is listed as an Agent/Assignee. Note: Jatco Ltd may have other listings under different names/spellings. We're not affiliated with Jatco Ltd, we're just tracking patents.

ARCHIVE: New 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009 | Company Directory "J" | Jatco Ltd-related inventors


Electric-vehicle control device and control method

In a specific state where an electric vehicle is in a stop state and a creep torque is generate in an electric motor (2), when a shift range is switched from a traveling range to a non-traveling range, a motor control section (10b) performs a torque decrease control to stepwisely decrease the creep torque of the electric motor (2), and an automatic transmission control device (30) performs a disengagement control to gradually disengage the frictional engagement element of the automatic transmission (3).. . ... Jatco Ltd

Powertrain

A powertrain includes; a first shaft connected to a first power source; a second shaft including first and second parts connected with a second power source and an output element respectively; first and second drive gears supported so as to be able to rotate relative to the first shaft; first and second driven gears supported on and fixed to the second shaft and respectively meshing with the first and second drive gears constantly; a first clutch capable of engaging the first drive gear with the first shaft; a second clutch capable of engaging the second drive gear with the first shaft; and a third clutch capable of connecting and disconnecting the first part to and from the second part between the first and second driven gears. Consequently, a powertrain with driving paths from multiple power sources in multiple stages can be achieved while avoiding the use of a three-shaft structure.. ... Jatco Ltd

Oil pressure control device for vehicle and oil pressure control method

An oil pressure control device has a mechanical oil pump (o/p) driven by a motor/generator (mg), an electric oil pump (m/o/p) driven by a sub motor (s/m) and a line pressure regulating valve (104). In a case where a state is changed from a state in which the motor/generator (mg) is stopped and the electric oil pump (m/o/p) is driven to a state in which the motor/generator (mg) is started and the electric oil pump (m/o/p) is stopped, when a total flow amount of a working fluid discharge flow amount of the mechanical oil pump (o/p) and a working fluid discharge flow amount of the electric oil pump (m/o/p) is equal to or greater than a pressure regulation limit flow amount of the pressure regulating valve (104), the working fluid discharge flow amount of the electric oil pump (m/o/p) is decreased.. ... Jatco Ltd

Vehicular hydraulic control device and hydraulic control method

A hydraulic control device includes: a mechanical oil pump (o/p) that is driven by a motor/generator (m/g) and that generates a first hydraulic pressure (p1); an electric oil pump (m/o/p) that is driven by a sub-motor (s/m) and that generates a second hydraulic pressure (p2); and a controller (10). When a demanded drive force from a driver is generated while in a low-vehicle-speed region which is lower than a first vehicle speed (v1) at which the output of the mechanical oil pump (o/p) becomes unstable, the controller (10) controls the electric oil pump (m/o/p) such that the second hydraulic pressure (p2) becomes larger than a compensative hydraulic pressure (pα) found by subtracting the first hydraulic pressure (p1) from a necessary hydraulic pressure (pne) determined in accordance with the demanded drive force.. ... Jatco Ltd

Control device for automatic transmission for vehicle

Disclosed is a control apparatus for a vehicular transmission comprising: a vehicle speed sensor; an accelerator opening angle sensor; and a gear-shift control section (8d) of a cvtecu 8. The vehicle speed sensor includes: an output shaft rotation speed sensor (90) configured to detect a rotation speed (rotation numbers) of an output shaft (41) of the automatic transmission; road wheel rotation speed sensors configured to detect rotation speeds (rotation numbers) of four road wheels (90b through 90e); and a vehicle speed calculating section (8b) of cvtecu 8 configured to calculate the vehicle speed from the information of the road wheel rotation speeds when a preset predetermined condition as a condition under which vertical variations of the rotation speed of the output shaft are generated is established and calculate the vehicle speed from the output shaft rotation speed information if the predetermined condition is not established.. ... Jatco Ltd

Oil pump

An oil pump is provided with an inner rotor having external teeth, an outer rotor disposed in a loose-fit state within a pump chamber and having internal teeth meshed with the external teeth, a ring-shaped pressure chamber provided adjacent to the pump chamber in a direction of a rotation axis, a discharge opening for connecting the pump chamber and the pressure chamber, and a cylindrical discharge passage having one end connected to the pressure chamber and the other end serving as a connection opening. A portion of the discharge passage is located to open inside of the outer periphery of the pressure chamber when viewed in the rotation axis direction. ... Jatco Ltd

Starting control device for vehicle and starting control method

A vehicle is provided with a mechanical oil pump (o/p) that is driven by a motor/generator (mg), an electric oil pump (m/o/p) that is driven by a sub-motor (s/m) and a second clutch (cl2) that transmits the drive force of the motor/generator (mg) to left and right drive wheels (lt, rt). When an accelerator pedal is depressed while a brake pedal is still depressed, an integrated controller (10) drives the electric oil pump (m/o/p) before the brake pedal is released, and oil pressure supplied to the second clutch (cl2) is increased.. ... Jatco Ltd

Oil pressure control device for vehicle and oil pressure control method for vehicle

An oil pressure control device for a vehicle is configured such that, when switching from an oil pressure supply by means of a mechanical oil pump driven by a motor/generator to an oil pressure supply by means of an electric oil pump driven by a sub-motor, a supply ratio of oil supplied from the mechanical oil pump and a supply ratio of oil supplied from the electric oil pump, are adjusted based on an oil pressure difference between a first oil pressure and a second oil pressure, via first and second flapper valves. When the first oil pressure becomes less than or equal to a pump drive threshold, an increase in the second oil pressure is initiated, and the first oil pressure and the second oil pressure are made to match at a predetermined equilibrium oil pressure higher than a required line pressure.. ... Jatco Ltd

Vehicular hydraulic control device and vehicular hydraulic control method

The present invention is configured such that: in a stopped state of an electric oil pump (m/o/p), control of the electric oil pump (m/o/p) is started such that, when a driver has the intention of demanding drive force, a discharge pressure takes on a target hydraulic pressure (pth) determined in accordance with the demanded drive force from the driver; and a pressure regulation target value of a line pressure regulation valve (101) is set to a value that is higher than or equal to the target hydraulic pressure (pth). Thus, it is possible to provide a vehicular hydraulic control device capable of suppressing hunting in line pressure (pl) when the line pressure (pl) is regulated so as to take on the target hydraulic pressure (pth).. ... Jatco Ltd

Automatic-transmission torque cam device

A torque cam device for an automatic transmission including: a drive cam member; and a driven cam member, each of the first drive cam surface and the first driven cam surface including an entire annular circumference equally divided into at least two sections each having a helical curved surface according to a cam angle, and connection portions formed between the equally divided helical curved surfaces, and at least one of the helical curved surfaces of the first drive cam surface and the first driven cam surface having a guide groove which is continuous in an entire circumference, and which is arranged to guide a movement of the ball.. . ... Jatco Ltd

Vehicle control device and method for controlling the same

A vehicle control device for controlling a vehicle including an oil pump driven by a transmission of a rotation of the motor-generator; and a hydraulic pressure supply unit for supplying a hydraulic pressure to the continuously variable transmission. The hydraulic pressure is generated by regulating a pressure of an oil discharged from the oil pump. ... Jatco Ltd

Control device for continuously variable transmission

Control device for continuously variable transmission (4) with auxiliary transmission having variator (20); hydraulic pressure control circuit (11) having primary pressure solenoid (11b); and transmission ratio controller (12) controlling the transmission ratio of variator (20) by feedback control. The transmission ratio controller (12) has a high limiter control unit (fig. ... Jatco Ltd

Vehicle oil pump driving control device

An oil pump driving control device of a vehicle having a main oil pump (14) that is driven by a motor/generator (4) and produces a pump discharge oil to a first clutch (3), a second clutch (5) and a belt-type continuously variable transmission (6) provided on a driving force transmission line. A hybrid control module (81) is provided in this ff hybrid vehicle. ... Jatco Ltd

Automatic transmission

Forward nine speed stages are achieved by four planetary gear units and six frictional elements and established by combination of synchronously fastening three of the six frictional elements. To an automatic transmission having the above-mentioned units and elements, there are added a first connecting member (m1) that connects a first ring gear (r1) of the first planetary gear unit (pg1) to a second carrier (c2) of the second planetary gear unit (pg2) and, a fourth brake (b4) that is able to fix the first connecting member (m1) to a transmission case (tc). ... Jatco Ltd

02/08/18 / #20180037231

Vehicle control device and vehicle control method

A vehicle control device includes control means for executing coasting control, in which a friction engaging element is disengaged and a rotation speed of a rotary shaft of a drive source is set at zero, when a shift range corresponds to a travel range and a coasting condition is established, and the control means executes the coasting control when the shift range is modified to a neutral range.. . ... Jatco Ltd

02/08/18 / #20180037229

Vehicle control device and control method therefor

A vehicle control device includes control means for executing coasting control to disengage a friction engaging element and set a rotation speed of a rotary shaft of a drive source at zero when a predetermined condition is established, the predetermined condition including at least a condition according to which an accelerator pedal is not depressed. The control means starts the coasting control after predicting that an actual speed ratio of a continuously variable transmission will be modifiable to a target speed ratio of the coasting control during the coasting control, even in a case where the accelerator pedal is not depressed but the actual speed ratio has not yet reached the target speed ratio.. ... Jatco Ltd

12/07/17 / #20170349180

Control device for continuously variable transmission of vehicle

The drive system from the engine (1) to the drive wheels (7) of a vehicle is equipped with a torque converter (2), which has a lock-up clutch (3), and a variator (4). Said engined car is provided with a lock-up control means for controlling the engagement/disengagement of the lock-up clutch (3) and a gear change mode switch-controlling means (fig. ... Jatco Ltd

11/16/17 / #20170328448

Transmission mechanism

A transmission mechanism has a set of two composite sprockets, each having pinion sprockets (210) supported movably in a radial direction with respect to a rotation shaft 1 that inputs or outputs power and a movement mechanism radially moving the pinion sprockets (210) in synchronization with each other while maintaining equidistance of the pinion sprocket (210) from a shaft center (c1) of the rotation shaft 1, and a chain wound around the two composite sprockets. Transmission ratio is changed by changing a circumcircle radius that is a radius of a circle encircling and circumscribing all the pinion sprockets (210). ... Jatco Ltd

11/16/17 / #20170328447

Transmission mechanism

Transmission mechanism has set of two composite sprockets (5, 5), each having pinion sprockets (20) supported movably in radial direction with respect to rotation shaft (1) inputting or outputting power and movement mechanism radially moving pinion sprockets (20) in synchronization with each other while maintaining equidistance of pinion sprocket (20) from shaft center (c1) of rotation shaft (1), and chain (6) wound around two composite sprockets. Transmission ratio is changed by changing circumcircle radius that is radius of circle encircling and circumscribing all the pinion sprockets (20). ... Jatco Ltd

11/09/17 / #20170320478

Hydraulic control device for automatic transmission and control method therefor

A vehicle control device including an electronically controlled throttle device and configured to control a vehicle for supplying a hydraulic pressure to a friction engaging element of a transmission on the basis of a throttle valve opening controls a start timing of a supply of the hydraulic pressure to the friction engaging element on the basis of an accelerator pedal opening and the throttle valve opening if a shift lever is changed from an advance position to a reverse position or from the reverse position to the advance position.. . ... Jatco Ltd

07/27/17 / #20170211697

Continuously variable transmission and method for controlling the same

A transmission controller increases hydraulic pressure supplied to a secondary pulley and decreases hydraulic pressure supplied to a primary pulley to shift a variator to a mechanical low speed ratio when the hydraulic pressure supplied to the primary pulley and the secondary pulley vibrates. The transmission controller shifts the variator from the mechanical low speed ratio to a high side when a sub-transmission mechanism is downshifted during controlling a speed ratio of the variator at the mechanical low speed ratio.. ... Jatco Ltd

07/27/17 / #20170210373

Control device and control method for vehicle

A control device for a vehicle is provided. The control device includes an automatic transmission constituted of a stepwise variable transmission mechanism configured to switch a plurality of shift stages by engagement and disengagement of a plurality of friction engaging elements, an engine as a driving source, a motor configured to assist a driving force of the engine, a hydraulic controller configured to supply a hydraulic pressure to control the engagement and the disengagement of the friction engaging element, and a control unit configured to control the automatic transmission to a target speed ratio through changing the shift stage of the stepwise variable transmission mechanism. ... Jatco Ltd

07/20/17 / #20170203751

Continuously variable transmission and control method thereof

A transmission controller determines hydraulic pressures supplied to a primary pulley and a secondary pulley on the basis of a torque calculation value in a case where an integrated controller does not detect a torque detection error, determines the hydraulic pressures supplied to the primary pulley and the secondary pulley on the basis of the torque calculation value in a case where the integrated controller detects the torque detection error and the torque calculation value is equal to or more than a predetermined value, and determines the hydraulic pressures supplied to the primary pulley and the secondary pulley on the basis of a torque value higher than the torque calculation value in a case where the integrated controller detects the torque detection error and the torque calculation value is less than the predetermined value.. . ... Jatco Ltd

07/20/17 / #20170203750

Control device for hybrid vehicle and control method of the same

A control device for hybrid vehicle is configured to transmit a torque generated by an engine and a motor to a power transmission member according to a driving power request from a driver. The control device for hybrid vehicle includes motor control means and transmission capacity control means. ... Jatco Ltd

06/29/17 / #20170184184

Transmission mechanism

Transmission mechanism has interlock mechanism (60) interlocking widening of circumcircle radius of one composite sprocket (5) and reduction of circumcircle radius of the other composite sprocket (5) during transmission ratio change. Interlock mechanism (60) is configured so that in a case where transmission ratio is changed toward uniform transmission ratio at which rotation speeds of two rotation shafts (1, 1) are the same, if actual chain length, which is real length of chain with respect to geometrical chain length that is length of ideal chain wound around two composite sprockets (5, 5) without excess and deficiency of chain length when widening and reduction are carried out by a same amount, is greater than predetermined length, reduction amount is set to be smaller than widening amount, while if the actual chain length is not greater than the predetermined length, the widening and reduction amounts are set to be the same.. ... Jatco Ltd

06/01/17 / #20170152924

Vehicle continuously variable transmission equipped with seal mechanism

A vehicle continuously transmission mechanism includes a seal mechanism to seal a hydraulic chamber defined by fixed and movable members on a back surface side of a movable sheave of a pulley or seal an oil passage communicating with the hydraulic chamber. This seal mechanism has an annular seal member normally brought into intimate contact with an opposing surface of the sliding contact part and a lip seal member formed with an annular lip such that a tip end of the annular lip is directed toward the outside and a side surface of the annular lip located closer to the hydraulic chamber or oil passage is brought into elastic contact with the opposing surface of the sliding contact part.. ... Jatco Ltd

05/04/17 / #20170122383

Cooling structure in clutch

In a cooling structure in a clutch having drive plates and driven plates, a lower limit of a width of each of dot grooves is set to a width a at which a flow quantity of lubricating oil passing through each of the dot grooves becomes a minimum flow quantity at which the drive plates and the driven plates can be cooled to a temperature equal to or lower than an upper limit temperature (tmax) and an upper limit of the width of each of the dot grooves is set to a width b at which an air content in lubricating oil passing through each of the dot grooves becomes a maximum air content at which, according to lubricating oil having the air content, the drive plates and the driven plates can be cooled to a temperature equal to or lower than the upper limit temperature (tmax).. . ... Jatco Ltd

01/26/17 / #20170021834

Engine control device for vehicle and engine control method for vehicle

An engine control device for a vehicle including a power train where a continuously variable transmission is coupled to an engine, includes engine torque control means configured to control the engine so as to obtain an basic engine torque corresponding to an operating state of the vehicle, and command means configured to command engine torque control means to increase an engine torque from the basic engine torque during a gear shifting from a first speed stage to a second speed stage. The continuously variable transmission includes a continuously variable transmission mechanism, an auxiliary transmission mechanism that includes at least a first engagement portion and a second engagement portion to achieve the gear shifting from the first speed stage to the second speed stage, and shift control means configured to set a target value of a transmission gear ratio of the entire continuously variable transmission mechanism and the auxiliary transmission mechanism based on the operating state of the vehicle to control the continuously variable transmission mechanism such that the target value is achieved.. ... Jatco Ltd

01/12/17 / #20170008524

Vehicle control device and method for controlling the same

A vehicle control device calculates a target line pressure based on an instructed torque capacity of a friction engaging element and a belt capacity when the friction engaging element is determined as not engaging. Belt capacity is calculated using an input torque of a continuously variable transmission mechanism. ... Jatco Ltd

01/05/17 / #20170002924

Control device for continuously variable transmission

A cvtecu includes a secondary-pressure control section and a line-pressure control section that performs a same-pressure control to equalize a line pressure and a secondary pressure with each other if a predetermined start condition is satisfied. The line-pressure control section realizes a same-pressure state between the line pressure and the secondary pressure by lowering the line pressure below a target secondary pressure, and then controls the line pressure such that an actual secondary pressure is brought to the target secondary pressure by hydraulic feedback control while maintaining the same-pressure state. ... Jatco Ltd








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