Fuji Jukogyo Kabushiki Kaisha

Keisuke Ajimoto

Shinya Yasunaga

Hiroki Tanaka

Masayuki Nishida

Takahito Morishita

Satoshi Ogawa

Koichi Inoue

Yasuyuki Miyake

Hiromichi Yahagi

Yasuhito Minamisawa

Kazuhiko Simonaka

A transmission control device includes a converter that converts continuous accelerator positions detected by an accelerator pedal sensor into a stepped step position, and a controller that controls the gear ratio of a continuously variable transmission based on the converted step position. The converter creates a hysteresis regarding the converted step position, when the accelerator depression amount increases, and when the accelerator depression amount decreases. In the case where the step position reaches a predetermined position or greater, the controller executes kick-down control where the gear ratio is controlled to a low side.

Shift control device for continuously variable transmission

An engine rotational speed display device includes: an engagement state determination module that determines an engagement state of a lock-up clutch; a target rotational speed setting module that sets a target turbine rotational speed according to a selected gear stage; a rotational speed for display selection unit that selects an engine rotational speed as a rotational speed for display when the lock-up clutch is not engaged and selects the target turbine rotational speed as the rotational speed for display when the lock-up clutch is engaged; a time measuring module that measures an elapsed time since a gear shift operation is received; and a rotational speed for display limiting module that limits a variation in the rotational speed for display per unit of time according to the elapsed time when the target turbine rotational speed is selected as the rotational speed for display.

Engine rotational speed display device

A shift control device includes a kick-down control unit that, in the case where the accelerator is depressed to a certain level or beyond, executes a first kick-down mode, in which a gear ratio of the continuously variable transmission is changed to a low side to increase the engine speed. In the case where, during execution of the first kick-down mode, a switchover operation is accepted to switch the output properties such that output of the engine is increased, the kick-down control unit again determines whether or not to start the first kick-down control again.

A shift control device for a continuously variable transmission includes a downhill control module that executes downhill control in which a gear ratio of the continuously variable transmission is corrected to a low side during driving downhill, and a gear ratio holding module that, in the case where a braking operation is detected while downhill control is executed, the gear ratio of the continuously variable transmission is held at the gear ratio at the time when the braking operation is started.

A power train control device includes: an automatic neutral clutch that adjusts driving force transmitted from an engine to a transmission mechanism constituting an automatic transmission; a transfer clutch that adjusts driving force transmitted from the transmission mechanism constituting to a driving system component which drives driven-wheels; an automatic neutral clutch control unit that releases the automatic neutral clutch if predetermined automatic neutral control conditions are satisfied; and a transfer clutch control unit that controls engaging force of the transfer clutch based on a running state of a vehicle equipped with the power train control device. When returning from automatic neutral control, the transfer clutch control unit temporarily releases and then re-engages the transfer clutch, during a period from start to completion of engaging of the automatic neutral clutch.

Power train control device

When a stepped shift control mode has been selected by a selection operation accepting unit and an acquired value of an indicator acquired by an indicator value acquisition module is greater than a required value of the indicator calculated from a required driving force calculated by a drive assist device, a shift control module executes shift control in the stepped shift control mode. If the acquired value is smaller than the required value, the shift control module executes shift control in the stepless shift control mode.

In a vehicle control apparatus, an engine torque calculating unit calculates a developing engine torque Te, and a torque increase/decrease amount calculating unit calculates a torque increase or decrease amount Tmax of an engine which can be increased or decreased. A mode coefficient setting unit sets a mode coefficient k corresponding to a driving mode, and an allowable inertia calculating unit multiplies the torque increase or decrease amount Tmax by the mode coefficient k to calculate an allowable inertia torque Timax. A shift speed calculating unit calculates a shift speed Vof a continuously variable transmission at which the allowable inertia torque Timax is generated, and an upper-limit shift speed setting unit sets an upper-limit shift speed Vbased on the shift speed V. A shift control unit performs shift control of the continuously variable transmission at a shift speed not exceeding the upper-limit shift speed V

Vehicle control apparatus

There is provided a vehicle control unit. The vehicle control unit provides an automatic mode that automatically determines a gear ratio in accordance with an operational status of a vehicle and a temporary manual mode that, with a driver's operation, selects any one predetermined gear ratio from among predetermined gear ratios set in advance and automatically switches a mode of operation to the automatic mode according to the operational status of the vehicle. When switching a mode of operation from the automatic mode to the temporary manual mode through a downshift operation that changes a gear ratio to a lower one in a transmission and an engine speed is lower than a reference rotational speed set in accordance with a vehicle speed, the vehicle control unit selects any one of the predetermined gear ratios such that the engine speed is equal to or more than the reference rotational speed.

Vehicle control unit

In a gear shift control unit for an automatic transmission, when an up-shift switch or a down-shift switch of a paddle shift switch is turned ON, a gear shift mode is set to a temporary manual shift mode, and a target transmission gear stage is shifted up or shifted down. Subsequently, a manual assist control is executed. In the manual assist control, an acceleration is calculated from a temporal differentiation of a vehicle speed. After it is detected that the acceleration is larger than or equal to an acceleration determination threshold, an accelerator pedal return acceleration is calculated from a double temporal differentiation of an accelerator opening degree. When the accelerator pedal return acceleration is smaller than or equal to another acceleration determination threshold, the current target transmission gear stage is automatically shifted down.

Gear shift control unit for automatic transmission

In a vehicle shift control apparatus, a T/M_ECU has data of cancellation conditions stored therein in advance, which vary depending on modes of driving force characteristics and, in a temporary manual shift mode, selects a cancellation condition for the temporary manual shift mode which corresponds to a current mode and makes a determination as to whether the cancellation condition is satisfied. If it is determined that the cancellation condition for the temporary manual shift mode is satisfied, the T/M_ECU returns the temporary manual shift mode to the automatic shift mode.

Vehicle shift control apparatus

In a vehicle driving-force control device, when a brake switch is turned on, a transmission control unit determines a currently-selected engine mode and sets a deceleration determination value by referring to a determination-value table corresponding to the currently-selected engine mode, using a vehicle speed as a parameter. Then, the transmission control unit compares an absolute value of a deceleration with an absolute value of the deceleration determination value, and shifts down the gear stage if the absolute value of the deceleration exceeds the absolute value of the deceleration determination value.

Vehicle driving-force control device

In a vehicle driving-force control device, if a primary speed is not lower than or equal to a kick-down allowable speed and an accelerator pedal depression amount is larger than or equal to a kick-down allowable depression amount, a shift control device identifies an intention of acceleration from a driver's accelerator operation and kick down a gear stage to a lower stage, even in a manual shift mode having been selected. In this case, the kick-down allowable speed is set to a different value for each of driving force characteristic modes, and a speed range in which a kick-down operation is allowed to be automatically performed on the basis of the primary speed is set narrower for a driving force characteristic mode having higher responsiveness to an accelerator operation.

In a control apparatus for a continuously variable transmission, when the difference between a target transmission gear ratio calculated immediately after switching the control mode from a manual shift mode to an automatic shift mode and a current transmission gear ratio (that is, a fixed transmission gear ratio of the transmission gear stage selected in the manual shift mode immediately before the switching) is greater than or equal to a set value, a shift control unit sets a temporary target transmission gear ratio between the target transmission gear ratio and the current transmission gear ratio. If a temporary target transmission gear ratio is set, the shift control unit causes the transmission gear ratio obtained during transition of mode from the manual shift mode to the automatic shift mode to match the target transmission gear ratio stepwise via the temporary target transmission gear ratio.

Control apparatus for continuously variable transmission

The input rotation speed of an automatic transmission is fixed, and an output shaft is fixed. Oil pressure supplied to a measurement subject engagement element is then increased, and a determination is made as to whether or not rotary variation in a turbine rotation speed is equal to or greater than a set value. When the rotary variation reaches or exceeds the set value, an oil pressure controlled variable at this time is measured and stored. Then, on the basis of the measurement data, a correction amount relating to the unique characteristic variation of the automatic transmission incorporated into a vehicle body is determined and written to a TCU.

Characteristic correction system for automatic transmission

When an ignition switch is turned off to stop an engine, a control apparatus of a continuously variable transmission places a line pressure regulating valve in a fully draining condition to reduce a load of a hydraulic pump by maintaining an electric power supply to the line pressure regulating valve, a shift control pressure regulating valve and the control apparatus.

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Tokyo, Japan

Keisuke Ajimoto