Honda Motor Co., Ltd.

Fumio Egashira

Yutaka Ishikawa

Akio Muto

Yasuyuki Hibino

Tomoyuki Noguchi

Eijiro Shimabukuro

Osahide Miyamoto

Kazuma Sasahara

The disclosure provides a control method, a control device for vehicular automatic transmission, and a recording medium. The control device includes an ON/OFF control solenoid controlling LC to either ON or OFF, and an LC pressure control linear solenoid controlling LC pressure between a released state and a fully engaged state. The control device acquires, when an accelerator pedal opening of a vehicle is on a deceleration side in a fully closed state, a torque converter slip ratio when the ON/OFF control solenoid maintains ON for a predetermined time period and the LC pressure control linear solenoid is controlled such that the LC pressure is OFF, and determines whether or not the second solenoid has a high-pressure fixation failure according to whether or not the slip ratio is within a predetermined range from a slip reference value.

Control method and control device for vehicular automatic transmission and recording medium

A control device controls a lockup clutch interposed between an engine and an automatic transmission mechanism of a vehicle. The control device includes a control part supplying hydraulic pressure to the lockup clutch and controlling differential pressure of the lockup clutch. The control part supplies the hydraulic pressure to the lockup clutch so that the differential pressure is lower than a reference differential pressure in a disengaged state of the lockup clutch. In a case of shifting the lockup clutch from the disengaged state to an engaged state, the control part supplies the hydraulic pressure to the lockup clutch so that the differential pressure increases as a filling ratio of an oil passage of the lockup clutch decreases. The reference differential pressure is a lower limit of the differential pressure that increases a slip ratio of the lockup clutch or reduces a slip amount of the lockup clutch.

Control device

A transport apparatus includes: a driving source; an output shaft; and a power transmission device capable of performing power transmission between the driving source and the output shaft. The transport apparatus comprises a control device which controls the driving source and the power transmission device, wherein the power transmission device includes a connecting/disconnecting unit configured to control a fastened state in which the power transmission is performed, and a released state in which the power transmission is not performed, and wherein the control device controls the connecting/disconnecting unit based on a thermal history of the connecting/disconnecting unit.

Transport apparatus

A gear change control device and method thereof are provided. The gear change control device is a target torque control device that sets a target torque of a motor outputting a torque to a multilevel transmission having a torque converter and a lockup clutch. In a case when the lockup clutch is in a fastened state and during upshifting gear change, target torque reduction control is executed for reducing the target torque of the motor such that the output of the motor becomes a torque at which a heat generation temperature of the lockup clutch does not exceed an allowable temperature. If the lockup clutch is fastened, threshold value changing control is executed for changing threshold value of a rotation speed of the motor or the input shaft when the gear range is shifted to the side of higher range during upshifting gear change to a higher rotation speed.

Gear change control device and gear change control method

A target torque control device and a target torque control method capable of maintaining a temperature within an allowable temperature even when a lock-up clutch is engaged are provided. In a target torque control device (ECU) for setting a target torque of a prime mover (E) that outputs a torque to a multi-stage transmission () including a torque converter () and a lock-up clutch (), when the lock-up clutch () is in an engaged state (STEP), a target torque reduction control for reducing a target torque of the prime mover (E) (STEP) is executed so that an output torque of the prime mover (E) becomes an output torque at which a heat generation temperature of the lock-up clutch () does not exceed an allowable temperature during the up-shift transmission (STEP).

Target torque control device and target torque control method

A control apparatus for an automatic transmission including a torque converter with a lock-up clutch capable of connecting an output shaft of an engine and an input shaft of the automatic transmission includes a release determination unit configured to determine based on a deceleration and a reference deceleration whether to change an engaging state of an engaging mechanism that constitutes the set gear range of the automatic transmission to a release state when a brake operation is detected, and a control unit configured to control the engaging mechanism based on determination of the release determination unit.

Control apparatus

If the rotation speed of the output shaft of an engine exceeds a lower limit engine rotation speed, and the rotation speed of an input shaft exceeds a lower limit input shaft rotation speed, the control apparatus of this invention executes cylinder deactivation control of decreasing the number of operating cylinders by stopping the operations of some of a plurality of cylinders based on a cylinder deactivation upper limit engine torque set by referring to a cylinder deactivation control table corresponding to the gear range of an automatic transmission.

A control apparatus for an automatic transmission including a torque converter with a lock-up clutch capable of connecting the output shaft of an engine and the input shaft of the automatic transmission includes a state determination unit configured to determine, based on an operation signal from an ABS device, whether the ABS device of a vehicle is in a normally operating state or in a fail state, a rotation speed determination unit configured to determine whether the rotation speed of the input shaft is not less than a reference rotation speed, and an operation control unit configured to control engagement of the lock-up clutch based on the operation state of the ABS device and the result of comparison between the rotation speed of the input shaft and the reference rotation speed.

In a lock-up clutch control device, base hydraulic pressure calculation device calculates base hydraulic pressure Pb for engaging a lock-up clutch based on input torque from an engine, correction factor calculation device calculates correction factor &#x3b1;, which is greater than 0 but less than 1, for correcting the base hydraulic pressure Pb based on an input rotational speed Ni of a transmission and a cylinder cut-off state of the engine. Commanded hydraulic pressure calculation device calculates a commanded hydraulic pressure Pc from the base hydraulic pressure Pb and the correction factor &#x3b1; by means of: current value of commanded hydraulic pressure Pc&#x2190;previous value of commanded hydraulic pressure Pc+(base hydraulic pressure Pb&#x2212;previous value of commanded hydraulic pressure Pc)&#xd7;&#x3b1;, and the commanded hydraulic pressure Pc is made to converge to the base hydraulic pressure Pb by repeating this a predetermined number of times.

Lock-up clutch control device

A controller for automatic transmission that performs feedback control on a slip ratio of a lockup clutch is adapted to select one target slip ratio from a plurality of target slip ratios based on a detected automatic transmission fluid temperature of a torque converter. Thus, the controller can ensure good followability to a target value of the feedback control even when the automatic transmission fluid temperature is low. The controller can effectively prevent engine hunting and the associated vibrations of vehicle body. Therefore, the controller can accomplish a favorable slip control of the lockup clutch even if an operating range of the lockup clutch is expanded to a range where the automatic transmission fluid temperature is low.

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Wako, Japan

Fumio Egashira