Abstract: In a slippage prevention apparatus of a belt-drive continuously variable transmission for an automotive vehicle in which a transmission ratio is controlled by a speed-change hydraulic pressure brought closer to a desired speed-change hydraulic pressure, a quick-acceleration-frequency decision section is provided to determine whether a frequency of quick accelerating operations is low or high. Also provided is a desired hydraulic pressure decision section that sets the desired speed-change hydraulic pressure used during an operating mode that the frequency of quick accelerating operations is low to a relatively lower pressure level than the desired speed-change hydraulic pressure used during an operating mode that the frequency of quick accelerating operations is high.

Abstract: A method for controlling the drive unit of a vehicle considers several desired input quantities of different priority in the formation of a desired value. At least one output quantity of the drive unit is adjusted in dependence upon the desired value input quantities. For adjustment, a desired value is formed which considers the desired value input quantities in the sequence of their priority.

Abstract: The improved CVT control apparatus for a vehicle is disclosed. By using the CVT control apparatus, it becomes possible that the drive feeling is constant independently of a running state, the vehicle is accelerated as the driver's intention if accelerated due to the actuation of an accelerator pedal, and the run of the vehicle is performed so as to improve the fuel consumption rate if the acceleration is not required.

Abstract: A direct injection type engine comprising a variable speed transmission. Engine control lines indicating the relationship between the engine rotational speed and required torque necessary for obtaining a required output are comprised of a first control line and a second control line at the high torque side and low speed side of the first control line. When the degree of activation of the exhaust gas purification device is low, the required torque and the engine rotational speed are made ones on the first control line in accordance with the required output, while when the degree of activation is high, the required torque and the engine rotational speed are made ones on the second control line in accordance with the required output.

Abstract: 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.

Abstract: When a transmission selector lever is operated from P or N range to D range, an input clutch to be engaged at the fifth gear position is temporally engaged to reduce shift shock when the engaging element for the first gear position is engaged. An oil pressure command value for actuating the input clutch is increased with a constant inclination from a start point oil pressure value, and the start point oil pressure value is lowered when the engine speed is low or when an oil temperature is high. Even if a timing of completion of filling of working fluid to the input clutch is fluctuated, the difference between the actual oil pressure and the oil pressure command value is suppressed to a small level and the occurrence of shock due to surge at the time of the filling completion is prevented.

Abstract: A synchromesh-type transmission includes a shift and select shaft axially movable for carrying out a select operation and rotatable for carrying out a shift operation, a plurality of shift fork shafts each provided with a pair of shift heads, and an inner lever fixed to the shift and select shaft. The inner lever is disposed between the pair of shift heads according to the axial moving operation of the shift and select shaft and comes in contact with one of the shift heads according to the rotational moving operation of the shift and select shaft, wherein a shift stage is performed. The inner lever is located at a neutral position according to the rotational operation of the shift and select shaft for the shift operation, wherein no shift stage is performed.

Abstract: In order to consider a vehicle driving altitude in a shift control method, an atmospheric pressure is detected, values of shift control variables are reset based on the detected atmospheric pressure when a predetermined atmospheric pressure applying condition is satisfied, and shifting is controlled on the basis of the reset values of the shift control variables.

Abstract: A drive-train control system is provided with an engine control system by which variables that influence the engine torque are controlled, a transmission control system by which a ratio of the transmission is controlled, and a map memory from which a set ratio of the transmission can be taken as a function of a torque demanded by the driver and of a variable linked to the vehicle speed, and the characteristics of which are defined in a vehicle-dependent manner taking into account the maximum possible torque.

Abstract: A method and system may be provided to perform a process for controlling power provided by an engine in a machine. In an embodiment of the present invention, a process for controlling power provided by an engine operating in a machine is provided. The process may include determining a first power value reflecting a predetermined first power to be provided by the engine to a component operating in the machine. Further, the process may include determining, during machine operations, at least one of a parasitic power value reflecting power received by a parasitic load module from the engine and an intermittent power value reflecting power received by an intermittent load module from the engine. A second power value may then be determined that reflects a second power provided by the engine based on the parasitic power value, the intermittent power value, and the net power value.

Abstract: A control system for an automatic transmission includes a torque converter which hydraulically transmits rotation of the driving power source to the speed change gear unit, a first friction engagement element, a second friction engagement element, a third friction engagement element, a vehicle stopping detecting mechanism for detecting a vehicle stopped condition when a forward driving range is selected, a vehicle weight detector, and a controller. The controller controls the disengagement of the first and second friction engagement elements and the engagement of the third friction engagement element with an engaging force in response to the vehicle weight when the vehicle stopped condition is detected while the forward driving range is selected.

Abstract: An improved surge suppression control for a motor vehicle drivetrain detects and suppresses drivetrain oscillation in a predetermined range of frequencies centered on an estimate of the natural frequency of the drivetrain. The drivetrain natural frequency is determined based on the current speed ratio of the vehicle transmission and empirically determined vehicle characteristics, and is used to define the center frequency of a band-pass filter responsive to engine speed. The filter output represents the AC component of the engine speed in a range of frequencies centered on the driveline natural frequency, and such component is differentiated to form an acceleration component in phase synchronism with the torque causing the detected resonance.

Abstract: In the case where a cooperative gear change control of an automatic transmission is executed on the basis of information with respect to a condition around a vehicle or in front of a vehicle, in a cooperative gear change control means, a gear change of the automatic transmission is directly determined on the basis of actual curve information and road surface inclination information in accordance with a previously stored downshift map, and a gear stage is switched such that a determined gear change is executed. Therefore, it is possible to directly obtain the gear stage or the gear ratio corresponding to the curve of the road and the inclination of the road surface.

Abstract: A shift control method for an automatic transmission based on one of a first shift pattern based on vehicle speed and an opening degree of a throttle valve and a second shift pattern based on the vehicle speed and a road condition includes the steps of switching a vehicle shifting condition to the second shift pattern when the opening degree of the throttle valve is a first predetermined opening degree or smaller than the first predetermined opening degree, and switching the vehicle shifting condition to the first shift pattern when the opening degree of the throttle valve is a second predetermined opening degree or larger than the second predetermined opening degree which is larger than the first predetermined opening degree.

Abstract: A range switchover apparatus includes a detent mechanism for holding in respective shift positions a range switchover operating unit capable of switching over a switchover device, which switches over a shift range, among respective shift positions, a driving force stopping unit for preventing a driving force from the drive motor from being transmitted to the range switchover operating unit, a stoppage controlling unit adapted to detect a position of the range switchover operating unit to control the driving force stopping unit so as to hold the range switchover operating unit in a predetermined shift position of the detent mechanism, an environment detecting unit for detecting an environment of the drive motor, and a rotation controlling unit for controlling the drive motor at a predetermined rotational speed in response to a state of the environment detected by the environment detecting unit.

Abstract: An improved surge suppression control for a motor vehicle drivetrain detects and suppresses drivetrain oscillation in a predetermined range of frequencies centered on an estimate of the natural frequency of the drivetrain. The drivetrain natural frequency is determined based on the current speed ratio of the vehicle transmission and empirically determined vehicle characteristics, and is used to define the center frequency of a band-pass filter responsive to engine speed. The filter output represents the AC component of the engine speed in a range of frequencies centered on the driveline natural frequency, and such component is differentiated to form an acceleration component in phase synchronism with the torque causing the detected resonance.

Abstract: A loading operation vehicle can reduce a specific fuel consumption during a traveling time and can improve operability of a driving characteristic. The vehicle is provided with output characteristic changing means (38, 48) for changing an output characteristic of an engine (1) in a plurality of stages, shift timing changing means (39) for changing a shift timing of an automatic transmission (9) in a plurality of stages, working machine flow amount changing means (32, 50) for changing a working machine flow amount of a pressurized oil flowing through a working machine actuator (42) in a plurality of stages, mode setting means (40) for combining the output characteristic of the engine, the shift timing of the automatic transmission and the set value of the working machine flow amount with each other so as to set a plurality of modes, and mode selecting means (45) for freely selecting from the modes.

Abstract: A gear shifting control device for synchromesh transmission judges whether a gear clash is generated during gear shifting based on gear shifting progress information. If gear clashes occur more frequently than a reference value during a particular shifting mode, then the control device may thereafter skip that shifting mode, if certain conditions are met. The vehicle operator is warned of this event.

Abstract: An improved powertrain control minimizes output torque disturbances due to garage shifting. Under certain predefined conditions, garage shifts to the forward or Drive range are carried out by initially commanding a shift to an upper forward gear ratio having a relatively low torque advantage, and then commanding a shift from the upper forward gear ratio to a lower forward ratio that is ordinarily used to launch the vehicle. The shift from the upper gear ratio to the lower gear ratio is initiated when the initial shift is substantially complete or when a predetermined period of time has elapsed since shift initiation. Engine management controls are also used to reduce the transmission input torque during garage shifts to both forward and reverse ranges.

Abstract: An arrangement for controlling an infinitely variable vehicle transmission includes an adjusting element which is operable in two modes. In a first mode, the adjusting element can be actuated to select from predetermined transmission gear settings. In the second mode, it can be actuated to cause a continuous adjustment of the vehicle gear. The direction, speed and manner of such adjustment depend on the manner in which the adjusting element is actuated, and optionally vehicle operating parameters. In addition, the adjusting element can be used to select from among driving control modes based on predetermined algorithms, for achieving maximum economy or maximum performance.

Abstract: Leak oil from a regulator 24 for regulating the pressure of oil supplied to a lubricating system (the lubricating pressure) is supplied to an oil cooler 23. An electromagnetic valve 25 is connected to a pressure controlling and regulating oil chamber 24a of the regulator 24 so that the lubricating pressure can be controlled to be increased or decreased. The lubricating pressure is decreased while an engine is running in a low load state during a high-speed running to thereby increase the volume of oil to be supplied to the oil cooler 23.

Abstract: A vehicle transmission (302) is equipped with an actuator (306) for shifting the transmission and a controller (306) for issuing a command to the actuator (306), to control a shifting operation of the transmission (302). A vehicle speed sensor (305) detects a speed of a vehicle, and a gear position sensor detects a current gear position of the transmission (302). The controller (306) stores at least two start gears higher a lowest gear of the transmission beforehand, and selects one start gear when starting a vehicle. The controller (306) selects the start gear based on whether the vehicle tows another vehicle or not.

Abstract: A control device for an automatic transmission which prevents an automatic transmission from executing a “busy-shift” caused by a lower gear ratio of the highest gear, and which reduces revolutions of a driving power source at high speed. The control device includes an automatic shift mode, an independent manual shift mode, and a highest gear control means. The automatic shift mode automatically determines a gear ratio of the automatic transmission on the basis of a driving condition of a vehicle having the automatic transmission. The manual shift mode determines a gear ratio of the automatic transmission by a driver's intention. The highest gear control means controls the automatic transmission, so that the smallest gear ratio set by the manual shift mode is smaller than the smallest gear ratio set by the automatic shift mode. If the gear ratio of the highest gear of the automatic shift mode is not so small, a shift caused by a change of a driving condition does not easily occur.

Abstract: A shift control method for an automatic transmission while a vehicle runs up a slope while towing a trailer includes the steps of determining if present shift lever position indicates a driving range 2, calculating weight-slope resistance if the shift lever position indicates the driving range 2, determining if the weight-slope resistance is greater than a threshold weight-slope resistance, measuring time duration during which the weight-slope resistance is maintained over the threshold value if the weight-slope resistance is greater than the threshold weight-slope resistance, determining if the time duration is longer than a threshold time, converting a present normal shift pattern into a trailer-towing shift pattern if the time duration is longer than a threshold time, and returning the trailer-towing shift pattern to the normal shift pattern if the weight-slope resistance becomes equal to or less than the threshold weight-slope resistance and this condition is maintained over a second threshold time.

Abstract: An improved powertrain control minimizes output torque disturbances due to garage shifting. Under certain predefined conditions, garage shifts to the forward or Drive range are carried out by initially commanding a shift to an upper forward gear ratio having a relatively low torque advantage, and then commanding a shift from the upper forward gear ratio to a lower forward ratio that is ordinarily used to launch the vehicle. The shift from the upper gear ratio to the lower gear ratio is initiated when the initial shift is substantially complete or when a predetermined period of time has elapsed since shift initiation. Engine management controls are also used to reduce the transmission input torque during garage shifts to both forward and reverse ranges.

Abstract: A line pressure control system for an automatic transmission wherein a shift range is determined by selectively engaging friction elements by means of a line pressure controlled according to an input torque of said automatic transmission. In the present invention, an engine output torque at the front stage of the automatic transmission is estimated from the operating condition. The input torque of the automatic transmission is calculated from the estimated engine output torque and the operation state of a torque converter. The calculated input torque of the automatic transmission is decreased during a predetermined time corresponding to an estimation response delay of the engine output torque after the engine is made in a no-load state, so as to properly control the line pressure.

Abstract: A driving force control device, which controls a driving force by changing a gear ratio of an automatic transmission, comprises: a virtual throttle opening converter for converting a target driving force into a virtual throttle opening by using a target driving force characteristic and a detected vehicle speed; a throttle opening information selector for selecting the virtual throttle opening from the virtual throttle opening converter as throttle opening information when the driving force is controlled, and selecting an actual throttle opening from the throttle opening sensor as throttle opening information when the driving force is not controlled; and a target input revolutionary speed calculator 123d that calculates the target input revolutionary speed according to the selected throttle opening information, the detected vehicle speed and one shift map. The Continuously variable transmission determines an achievable gear ratio according to the target input revolutionary speed.

Abstract: Engine torque control system based on the dynamic behavior of a driven automatic transmission consists in that the engine dynamics is limited as function of a sporting mode.

Abstract: An internal combustion engine (1) especially for a motor vehicle is described. The engine is provided with an injection valve (10) with which the fuel is injected for a combustion, can be injected directly into a combustion chamber (4) of a cylinder (3) in a first operating mode during an induction phase and in a second operating mode during a compression phase. A spark plug (11) is provided with which the fuel, which is injected in both operating modes, is ignited. A catalytic converter (13) is provided for storing nitrous oxides arising during the combustion. With a control apparatus (12), the operating variables of the engine (1) can be controlled (open-loop and/or closed-loop) in both operating modes. A gear change into another gear stage and a switchover into the first operating mode can be carried out approximately simultaneously by the control apparatus (12). The switchover into the first operating mode is provided for discharging the nitrous oxides stored in the catalytic converter (13).

Abstract: In the transmission and air conditioning control system having an air conditioner provided with a compressor driven by an engine and an evaporator for cooling a passenger room, and a transmission connected between the engine and a wheel, an electronically control device controls the transmission ratio to a reference value to be decided by the operating condition of the vehicle and also to a final value, which is higher than the reference value, when a degree of cooling demand is greater than a predetermined value. As a result, the revolution of the engine is more increased so that the revolution of compressor may be more increased to improve the cool down performance.

Abstract: 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.

Abstract: A vehicle transmission (302) is equipped with an actuator (303) for shifting the transmission (302). A controller (306) causes the actuator (303) to shift the transmission (302) based on movement of a shift lever (308). A learning unit (306) memorizes a gear position of when a vehicle is stopped, a brake pedal is stamped, an accelerator pedal (307) is not stamped, and a certain transmission gear is selected, as a start gear. The vehicle moves from that start gear and stops. When the vehicle is restarted, the learning unit (306) selects the memorized start gear and the controller causes the actuator (303) to shift the transmission to that start gear. The learning unit (306) separately memorizes the gear position of when the vehicle tows another vehicle and the gear position of when the vehicle does not tow any vehicle.

Abstract: A method for controlling gear shifting of a transmission in a vehicle. The transmission is supplied with electric power from a battery or an alternator and drives an actuator to shift gear ranges of the transmission. The transmission has an output shaft that becomes difficult to rotate if a predetermined range is selected when the engine stops running. The method includes determining whether a gear range differing from the predetermined range is selected when the vehicle stops traveling, and forcibly shifts the gear range to the predetermined range when a gear range differing from the predetermined range is selected by driving the actuator with electric power supplied from the alternator.

Abstract: A hydraulic pressure control apparatus for controlling an automatic transmission of an automotive vehicle, with a pressurized working fluid delivered from a hydraulic pump driven by an electric motor, wherein a pump control device is operated upon starting of the electric motor to start the hydraulic pump, for controlling the electric motor, such that a rate of increase of the operating speed of the hydraulic pump decreases with a decrease in the temperature of the working fluid detected by a temperature detector.

Abstract: In a shift control method for an automatic transmission, it is first determined if a vehicle is running on a level road according to a signal from a drive state detector, then one of an economy or a power mode is selected according to a current throttle opening ratio. After, an upshifting point of the selected mode is set, a speed ratio is set according to the upshifting point of the selected mode and outputting a corresponding control signal to a drive unit.

Abstract: A method is presented for improved interaction between driver demand, cruise control system and traction control system in an internal combustion vehicle. Desired engine output torque is adjusted based on the above inputs and vehicle operating conditions. This method improves drive feel and customer satisfaction with vehicle performance.

Abstract: A shift control apparatus for an automatic transmission is provided in which, during slip, a sense of discomfort to the driver and other occupants is eliminated or reduced and the necessary driving force is obtained. When slip is detected by detecting the speed of the wheels by wheel speed detecting means, slip determining means outputs a slip signal. Maintaining means into which the slip signal has been input then outputs to shifting means a maintaining signal for maintaining the gear stage (for example, first speed) at the point during which the slip signal was input until a predetermined period of time has passed. If slip continues after the predetermined period of time has passed, the shifting means outputs a shift signal to the automatic transmission to shift it to a predetermined gear stage (for example, third speed), thus reducing driving force and preventing slip from continuing.

Abstract: In order to consider a vehicle driving altitude in a shift control method, an atmospheric pressure is detected, values of shift control variables are reset based on the detected atmospheric pressure when a predetermined atmospheric pressure applying condition is satisfied, and shifting is controlled on the basis of the reset values of the shift control variables.

Abstract: A method and system of controlling a maximum start gear ratio of an automated mechanical transmission system is disclosed. To protect the clutch under conditions of level ground up to a mild grade, a maximum starting gear is determined by the system when a valid Gross Combination Weight (GCW) of the vehicle is known. The maximum starting gear is defined as the highest starting gear ratio that will provide adequate startability without having to put excessive energy into the clutch during the start. The system will force a downshift if insufficient vehicle acceleration is detected by the system. If the GCW of the vehicle is not known, the maximum start gear will be limited to that for a fully laden vehicle. To protect against too much power being transmitted through the clutch, the power through the clutch is determined and the engine torque and/or engine speed is limited to values resulting in power through the clutch below a preset value.

Abstract: In the case where a cooperative gear change control of an automatic transmission is executed on the basis of information with respect to a condition around a vehicle or in front of a vehicle, in a cooperative gear change control means, a gear change of the automatic transmission is directly determined on the basis of actual curve information and road surface inclination information in accordance with a previously stored downshift map, and a gear stage is switched such that a determined gear change is executed. Therefore, it is possible to directly obtain the gear stage or the gear ratio corresponding to the curve of the road and the inclination of the road surface.

Abstract: A control system for an automatic transmission of a vehicle is disclosed. The automatic transmission operates in a manual operating mode in which a shift position of the automatic transmission can be changed according to a shift instruction issued by a driver of the vehicle, or in an automatic operating mode in which the shift position is automatically selected. In the control system, a slow running intention of the driver is detected. A first shift position is set to a starting shift position at the time of starting the vehicle when the slow running intention of the driver is not detected in the manual operating mode. A second shift position which is lower in transmission gear ratio than the first shift position is set to the starting shift position when the slow running intention of the driver is detected in the manual operating mode.

Abstract: In a process for controlling an automatic gearbox, an electronic gear box control (13) calculates in a first mode of operation a driving activity and determines the set gradient of the gear box input speed of rotation depending on the driving activity. In a second mode of operation, the electronic gear box control selects a special program among a plurality of special programs and determines the set gradient of the gear box input speed of rotation depending on the selected special program.

Abstract: A motor vehicle drive and a method for controlling a motor vehicle drive in which control signals, by reference to which a set position is set, are transmitted from a superordinate controller to a subordinate clutch position controller. An actual position signal is transmitted from the position controller to the controller. A feedback message is transmitted from the controller to the position controller via an efficient interface, and the controlling quality is thus optimized by the position controller in accordance with the respective travel situation.

Abstract: The improved CVT control apparatus for a vehicle is disclosed. By using the CVT control apparatus, it becomes possible that the drive feeling is constant independently of a running state, the vehicle is accelerated as the driver's intention if accelerated due to the actuation of an accelerator pedal, and the run of the vehicle is performed so as to improve the fuel consumption rate if the acceleration is not required.

Abstract: A system for controlling an automatic transmission of a vehicle which determines a downgrade or upgrade parameter based on the vehicle acceleration and selects one from among a plurality of shift programs based on the determined grade parameter to determine a gear ratio based on the selected shift program. The system includes a navigation system which determines the instantaneous vehicle position and outputs road information including upgrade/downgrade condition of road including the determined instantaneous vehicle position. In the system, the grade parameter is corrected based on the navigation information and the grade parameter such that the one from among a plurality of shift programs is selected based on the corrected grade parameter, thereby enhancing drivability during downgrade running, without being affected even if the navigation information is temporarily invalid.

Abstract: A method for influencing a shift process connected with a change in transmission ratio when driving a motor vehicle that has a set of driven wheels subject to longitudinal and transverse forces, the method including detecting whether or not the vehicle is traveling around a curve and, if doing so when the shift process is in progress, influencing the shift process so as to decrease the longitudinal forces that act on the driven wheels as a result of the shift process. Also disclosed is an apparatus for performing the disclosed method including a detector for detecting whether or not the vehicle is traveling around a curve and a transmission ratio shifter responsive to the detector that, if the vehicle is traveling around a curve when the shift process is in progress, performs the shift process so as to decrease the longitudinal forces that act on the driven wheels as a result of the shift process.

Abstract: A system for controlling a speed of a vehicle having a continuously variable transmission (CVT) and a cruise controller which controls the traveling speed of the vehicle to a desired speed in response to the instruction to cruise control inputted by the vehicle operator. In the system, the detected throttle opening is smoothed or filtered such that the speed ratio of the continuously variable transmission is controlled based on the smoothed throttle opening and the detected vehicle speed when the instruction to cruise control is input. Alternatively, a parameter indicative of upslope of the road where the vehicle climbs is determined and the speed ratio is controlled based on the parameter and the detected vehicle speed. With this, the system can reduce the engine speed fluctuation and can prevent the vehicle operator from feeling uneasy when the cruise control is effected.

Abstract: A vehicle transmission (302) is equipped with an actuator (303) for shifting the transmission and a controller (306) for issuing a command to the actuator (303) to control a shifting operation of the transmission (302). A vehicle speed sensor (305) detects a speed of a vehicle, and a gear position sensor detects a current gear position of the transmission (302). The controller (306) stores at least two start gears higher a lowest gear of the transmission beforehand, and selects one start gear when starting a vehicle. The controller (306) selects the start gear based on whether the vehicle tows another vehicle or not.

Abstract: A vehicle control device controls an automatic transmission by utilizing road information stored in a navigation system unit. In response to the road information stored in a data memory, the upper-limit of a shiftable transmission speed range is determined, thereby allowing shift-change only within the restricted transmission range. The actual down-shift is carried out after confirming a decelerating operation by the driver, such as release of the accelerator pedal, thereby providing favorable transmission control in conformity with the driver's intention.

Abstract: A system for controlling an automatic transmission of a vehicle which determines a downgrade or upgrade parameter based on the vehicle acceleration and selects one from among a plurality of shift maps (programs) based on the determined grade parameter to determine a gear ratio based on the selected shift program. The system includes a navigation system which stores the road information including the kinds of road. The system determines whether the vehicle runs on a relative road such an alley or a traffic jammed expressway based on the vehicle speed change, the vehicle-stopping-time and the navigation information and if it does, changes the upshift line of the level-road map in the direction in which the vehicle speed increases such that upshift is not likely to occur, or in the direction in which the vehicle speed decreases such that the upshift is more likely to occur, thereby enhancing driveability.