A control device calculates the amounts of changes (estimated values [delta] NC) in output rotational speeds of an automatic transmission are calculated (S10), calculates the average value (initial average G at inertia (I) phase) of amounts of variations in output rotational speeds in a predetermined period at an early stage of the I phase of gear shift is calculated, calculates the average value (average G after gear shift) of vehicle accelerations after completion of gear shift is calculated assuming that the amount of a change in output rotational speed indicates a vehicle acceleration G, calculates the difference (I phase initial G) between the average value of amounts of changes in output rotational speeds and the average value of vehicle accelerations, corrects the target value of the transmission torque of a frictional engagement element by increasing or decreasing the target value such that the calculated difference falls within a predetermined range, and controls the oil pressure supplied to the frictional engagement element so that the corrected target value is achieved (S14 to S20). As the control device is configured in this way, the control device estimates and evaluates vehicle accelerations during gear shift, and on this basis, learns matters such as variations in the transmission torque of the frictional engagement element, and as a result, can sufficiently bring out the latent potential of the frictional engagement element, and improve the gear shift feeling sensed by an occupant during gear shift.

Control device for automatic transmission

A control device is disclosed which can obtain increased fuel economy performance depending on a kind of fuel in a vehicle having an internal combustion engine and an electric motor when the kind of fuel supplied to the internal combustion engine is altered. A determining vehicle speed (V1) and determining output torque (T1), representing a boundary value with which a step-variable control region and a continuously variable control region of a shifting mechanism (10) are demarcated, are altered such that the higher the mixing ratio of ethanol, the lower will be the determining vehicle speed (V1) and determining output torque (T1). Therefore, the determination is made whether to operate a first electric motor (M1) depending on the mixing ratio of ethanol, making it possible to obtain increased fuel economy performance in line with the mixing ratio of ethanol.

Control device for vehicular power transmitting apparatus

Methods and systems are provided for restarting an engine in response to a driver's change-of-mind. In one embodiment, the engine is shutdown during an idle stop with the transmission in a higher gear or with the transmission tied-up to a transmission case. In response to a driver change-of-mind restart request, the transmission is downshifted, or released from the tie-up, to return driveline torque.

Method and system for engine control

A change gear control device is provided for an automatic transmission in a motor vehicle propelled by an internal combustion engine which is operated with an air/fuel mixture having air/fuel ratios ranging from a fuel rich air/fuel ratio to a fuel lean air/fuel ratio depending on driving conditions of the motor vehicle. In this device a first detector detects an engine torque of the internal combustion engine and a second detector detects a vehicle speed of the motor vehicle. A processor processes transmission gear ratios for the automatic transmission. In particular, the processor reads the detected engine torque from the first detector and the detected vehicle speed from the second detector, determines a new transmission gear ratio based upon the engine torque and the vehicle speed, and outputs a signal representing the new transmission gear ratio to the automatic transmission, whereby a gear shifting operation is effected at a timing based on an engine torque variation due to an operating air/fuel ratio change.

Change gear control device using acceleration and gear ratio as parameters for automatic transmission in a motor vehicle and the method therefor

It is provided a control device for a vehicle power transmission device including a shifting portion and an electric motor that provides regeneration via the shifting portion, the control device executing a downshift of the shifting portion if a traveling loss in the vehicle power transmission device after the shift is smaller than a traveling loss in the vehicle power transmission device at a current gear ratio during regenerative traveling, and the traveling loss in the vehicle power transmission device including at least one of a loss in the shifting portion and a loss in the electric motor, the loss in the shifting portion being calculated based on the operating oil temperature of the shifting portion and the loss in the electric motor being calculated based on the temperature of the electric motor.

Control device for vehicle power-transmission device

A speed-changing hydraulic oil pressure control apparatus for controlling speed-changing hydraulic oil pressure according to a transition state of the speed change in an automatic transmission. The controllability is improved by detecting in advance the transfer from a torque phase to an inertia phase by detecting the output torque of the transmission and the input revolution number and output revolution number of a torque converter. The input torque of the transmission is estimated from the input revolution number and output revolution number of the torque converter, and the transition state of the speed change is detected from the input torque and output torque of the transmission. By comparing input torque and output torque of the transmission, the transfer from the torque phase to the inertia passe is detected in advance by utilizing the phenomenon of a large fall of the output torque of the transmission just before the transfer to the inertia phase from the torque phase.

Speed-changing hydraulic oil pressure control apparatus for an automatic transmission of an automobile

The present invention involves control of an increase in engine output of a vehicle fitted with an automatic transmission incorporating a torque converter, during a period from transmission selector operation from a stop range to a drive range up until a speed ratio (Nt/Ne) of engine rotational speed Ne to torque converter output shaft rotational speed Nt falls below a predetermined value. Control is effected by a method involving for example, maintaining a second control valve used for traction control fully closed. As a result of the invention, completion of the gear selecting operation can be accurately judged, and effects due to alleviation of gear selection shock and reduction in the load on components such as the differential can be reliably achieved.

Method and apparatus for controlling, during N-D or P-D shift, the engine output by a second throttle valve of a vehicle fitted with an automatic transmission

In an anti-lock braking apparatus, by detecting brake torque at a wheel and controlling the braking force of a wheel brake unit, a locked state of the wheel can be quickly detected to thus enable braking control with fast response characteristics. Also, based on direction of a variation of the brake torque on the wheel, the road friction coefficient is predicted to perform feedback control for the braking force and to adjust the brake torque to a target brake torque, whereby the braking performance can be optimized.

Method and system for anti-lock braking in automobile by measuring brake torque

PURPOSE: To reduce the shock by the changeover of the operation of auxiliaries so as to improve comfortableness in operation by putting it in constitution of properly controlling the line pressure of an automatic transmission, accompanying the operation changeover of auxiliaries driven by an engine. CONSTITUTION: This line pressure controller for automatic transmission is equipped with a line pressure setting means, which sets the line pressure according to the quantity of fuel injection to be supplied to an engine or the value equivalent to this, and an auxiliaries consumption torque operating means, which operates the amount of engine output torque consumption by auxiliaries based on the quantity of fluctuation of engine operating conditions at the time of start-up of driving of the auxiliaries driven by the engine. And it is constituted such that the consumption torque operated by the auxiliaries consumption torque operating means is stored in an auxiliaries consumption torque storage means, that the driving of auxiliaries is detected by an auxiliaries driving detecting means, and that the line pressure set by the line pressure setting means is compensated based on the value stored in the auxiliaries consumption torque storage means, when the auxiliaries are driven, by a line pressure compensating means. COPYRIGHT: (C)1991,JPO&Japio

Line pressure controller for automatic transmission

PURPOSE: To prevent an engine stall from occurring by increasing an intake air quantity as much as more than an air density dropping portion at idling when atmospheric pressure goes down, in a device which sets a fuel injection quantity on the basis of engine speed and intake pressure. CONSTITUTION: Each detected value of a throttle sensor 8, an intake pressure sensor 9, a water temperature sensor 12, a crank angle sensor 15 or the like is inputted into a control unit 11, controlling valve opening time of a fuel injection valve 10 and an idle controlling valve 17 installed in an auxiliary air passage 16. The control unit 11 sets a fundamental fuel injection quantity on the basis of intake pressure and engine speed, while it detects atmospheric pressure on the basis of output of the intake pressure sensor 9 at a high load driving area where an intake air quantity is not varied, and increases the extent of opening of the idle controlling valve 17 so as to increase the intake air quantity as much as more than an air density dropping portion at idling when atmospheric pressure goes down. COPYRIGHT: (C)1989,JPO&Japio

Masuo Kashiwabara

Papers

Speed-changing hydraulic oil pressure control apparatus for an automatic transmission of an automobile

Method and apparatus for controlling, during N-D or P-D shift, the engine output by a second throttle valve of a vehicle fitted with an automatic transmission

Method and system for anti-lock braking in automobile by measuring brake torque

Line pressure controller for automatic transmission

Electronic control fuel injection system for internal combustion engine