Aisin Aw Co., Ltd.

Masamichi Unoki

Muneo Kusafuka

Masakatsu Iwase

Junichi Nishimura

Kazumasa Tsukamoto

Masao Saito

Yoshikazu Sakaguchi

Masahiro Hayabuchi

Masaaki Nishida

Hiroshi Tsutsui

Yoshihisa Yamamoto

Takao Taniguchi

Masayuki Sugiura

Takahiro Sekii

Mitsunori Nakane

Tsutomu Mizutani

Kazuo Koumura

During an upshift in a full-throttle state, the output of a shift command (Us ) from a control unit is followed by a delay in initiation of an actual shift, due to a delay in increase in oil pressure, a rise in the clutch torque load, etc. A shift initiation (Uj) is determined by comparing the input rotational speed (Ni) with the product of multiplication of the output rotational speed (vehicle speed) (No) by the pre-shift gear ratio. The shift point (Mp ) is learning-corrected based on the shift initiation-time engine rotational speed (NeI). Therefore, false learning is avoided even if the engine races during a shift.

Speed shift control and apparatus for control of automatic transmission

A shift control apparatus for an automatic transmission eliminates or reduces a sense of discomfort to the driver and other occupants during slip, while maintaining the necessary driving force. When slip is determined by detection of wheel speed, a slip signal is output. A controller which receives the slip signal outputs a maintaining signal for maintaining the gear stage which existed at the time the slip signal was received, until a predetermined period of time has passed. If the slip continues after the predetermined period of time, the controller outputs a shift signal to the automatic transmission to shift it to a predetermined gear stage, thus reducing driving force and preventing slip from continuing. If the slip stops within the predetermined period of time, the slip signal is canceled such that the current gear stage is maintained and no shift is executed.

Shift control apparatus for an automatic transmission

The disclosed automatic transmission controller is capable of changing shift timing set for non-flat roads in correspondence to a judged driver type. The automatic transmission controller executes a driver type judging routine SUB to generate a judgment output related to the driver type by monitoring the driving of the vehicle and judges the driver type based on the judgment output. Shift timing is changed in running a non-flat road to correspond to the judged driver type. The shift timing in running the non-flat road may be changed by changing from an uphill slope mode shift map to an uphill slope mode shift map corresponding to the driver type or by increasing an upshift inhibiting section of a single map.

Controller for automatic transmission

An automatic transmission controller is capable of compensating for both driver type and tendencies of a driver in temporary acceleration, such as in passing. The automatic transmission controller executes a driver type judging subroutine for judging the overall acceleration habits of the driver and classifying the driver as one of a plurality of driver types by monitoring the driving behavior for a predetermined time. The controller also executes a temporary acceleration inclination judging routine for judging the habits of the driver in temporary acceleration by monitoring driving behavior for a period of time shorter than the predetermined time, and executes shift control routines for controlling and changing the shift timing based on the judged driver type and the inclination in temporary acceleration. The controller controls shift timing, taking into account both the driver type and the inclination in temporary acceleration, such as passing.

A control unit for an automatic transmission provides improved responsiveness to a speed reduction operation by the driver. The control unit includes a speed reduction requirement judging logic which judges whether or not there is a speed reduction requirement. An up-shift is inhibited and prevented when a judgement is made that there is a speed reduction requirement, based at least in part on release of the accelerator. Accordingly, it is possible to prevent a vehicle from being accidentally accelerated by an up-shift operation and to smoothly perform a down-shift to effect an engine brake.

Control unit of automatic transmission

A control system for an automatic transmission having a running status detector for detecting the running status of a vehicle including an input torque from an engine; a running resistance estimator for estimating a running resistance on the basis of the running status of the vehicle; a running resistance comparator for comparing the estimated running resistance and a preset reference value; and a shift characteristic changing device for changing shift characteristics in accordance with the comparison result of the running resistance comparator. The automatic transmission control system further has a temperature sensor for detecting a temperature relating to the temperature of the engine and a decision device for determining a specific engine running status, in which the output of the engine drops, on the basis of an output signal coming from the temperature sensor. The running resistance comparator changes the reference value in accordance with the determination of the decision device.

Control system for automatic transmission

The invention provides a control apparatus for an automatic transmission for carrying out neutral control and hill-hold control in a range that causes no slip of a hill-hold brake. The control apparatus has a judgment unit for determining, in accordance with a signal output by a gradient detector whether an uphill road is steep enough to cause a hill-hold brake to slip with the hill-hold brake engaged, a hydraulic pressure reducing device for reducing the hydraulic pressure applied to a hydraulic servo of a clutch in order to place the clutch in an all but released state, a hydraulic pressure applying device for applying a hydraulic pressure to a hydraulic servo of a brake in order to engage the brake, and an execution unit for permitting the hydraulic pressure reducing device to reduce the hydraulic pressure applied to the hydraulic servo and the hydraulic pressure applying device to apply a hydraulic pressure to the hydraulic servo only if a stop, or halted, state is detected by a stop-state detector and an uphill road is determined by the judgement unit not to be steep enough to cause the hill-hold brake to slip.

Control apparatus for an automatic transmission

A control system for an automatic transmission having a running status detector for detecting the running status of a vehicle to include an input torque from the engine; a running resistance estimator for estimating a running resistance on the basis of the running status of the vehicle; and shift characteristic changer for changing shift characteristics in accordance with the running resistance of the vehicle. The control system further comprises an engine output controller for reducing the output of the engine by a sub-throttle valve which acts independently of the driver at an overrun time of drive wheels; and an action status detector for detecting the action status of the sub-throttle valve. The running resistance estimator estimates the running resistance of the vehicle on the basis of the running status detector and the action status detector of the sub-throttle valve.

Growing community of inventors

Anjo, Japan

Masamichi Unoki