Abstract: A method and apparatus control an automatic transmission. A controller prohibits a down-shift of the automatic transmission when the input rotation speed of the automatic transmission is determined to be equal to or greater than a predetermined value due to operating characteristics of a device or a plurality of devices installed in a vehicle equipped with the automatic transmission and an engine. Since the down-shift of the automatic transmission is prohibited, when the input rotation speed is determined to be equal to or greater than the predetermined value, the input rotation speed of the automatic transmission is prevented from being further increased. Consequently, overrun of the engine is effectively avoided.

Abstract: A method and apparatus for controlling a continuously variable transmission of a motor vehicle includes a controller that controls the speed ratio of the continuously variable transmission in accordance with a predetermined shift condition. The method and apparatus perform shift control in a specific manner during an operation of an anti-lock brake system, for example, by smoothing at least one of the rotational speed of the input shaft and the rotational speed of the output shaft, reducing a rate of change in the speed ratio during downshifting, restricting upshifting of the CVT, increasing an amount of hydraulic oil delivered from an oil pump, and/or increasing belt clamping force.

Abstract: When the temperature of operating fluid of an actuator is low, a target input rotation speed lower limit value NinL is set. The lower limit value NinL is greater than a lower limit value set for a normal temperature of operating fluid. A target input rotation speed Nint is calculated from the state of running of a vehicle, such as the amount of operation of an accelerator, the vehicle speed, etc. If the target input rotation speed is lower than the lower limit value NinL, the target input rotation speed is reset to the lower limit value NinL. As a result of a control that includes the above-described steps, the speed ratio &ggr; becomes relatively high before the vehicle stops. Therefore, even if the speed ratio-changing rate is low, the speed ratio &ggr; can be brought to or near a maximum value &ggr;max before the vehicle stops. Thus, reductions in the speed ratio-changing rate caused by low temperature of the operating fluid of the actuator can be curbed.

Abstract: A shift control system for a continuously variable transmission, in which a road load on a vehicle is detected, the lower limit speed is set according to the detected road load, in which a target input speed, as set according to the running state of a vehicle, is restricted with the set lower limit speed, and in which the gear ratio of the continuously variable transmission is controlled so that the actual input speed may be equal to the target input speed restricted. The target input speed is restricted after the actual input speed is more than the lower limit value, when the road load is light, and said target input speed is restricted irrespective of the actual input speed when the road load is heavy.

Abstract: A hydraulic control system for outputting an oil pressure instruction signal to a pressure modulating mechanism, to modulate the oil pressure generated in the hydraulic pump to an oil pressure according to the instruction signal and to feed the modulated oil pressure to a transmission.

Abstract: A shift control apparatus for a motor vehicle including an Internal combustion engine and a continuously variable transmission (CVT) is provided for controlling the speed ratio of the CVT depending upon operating conditions of the vehicle. The control apparatus determines whether an electronic throttle valve of the engine is at fault or not, and restricts the speed ratio of the CVT when the throttle valve is at fault such that the input-side rotation speed of the transmission is variable within a range that is narrower than a range in which the rotation speed is variable during normal running of the vehicle. The range of the input-side rotation speed may be defined by the upper limit, or the lower limit, or both the upper limit and the lower limit.

Abstract: A control apparatus is provided in a vehicle equipped with a power source and a continuously variable transmission. The continuously variable transmission is connected to the power source. The control apparatus includes a target power determinator, a target revolutions determinator, a determining device, a setting device and a target torque determinator. The target power determinator determines a target power of the power source. The target revolutions determinator determines target revolutions on the basis of the target power. The determining device determines whether the vehicle is a transient driving condition or not. The setting device sets the target revolutions as setting revolutions when the determining device determines that the vehicle is not in the transient driving condition. The setting device sets revolutions different from the target revolutions as the setting revolutions when the determining device determines that the vehicle is in a transient driving condition.

Abstract: A control apparatus for a vehicle includes a power transmitting system between an engine and wheels. The transmitting system has a continuously variable transmission (CVT) and a motor-generator actuated in one of a regenerating operation mode and an assisting operation mode. The motor-generator serves as a generator in a regenerating operation mode and as a motor in an assisting operation mode. The apparatus includes an electric control unit (ECU) that determines a shift of engine speed, computes the total amount of torque of the engine, the CVT and the motor-generator and selects one of the operation modes and actuates the motor-generator base on the selected operation mode to corrects the engine speed.

Abstract: A control system (in FIG. 1A) for a motor vehicle having a continuously variable transmission, in which a control of better fuel consumption is selected between the retardation angle correction (the correction of the retardation angle side of an advance angle correction) of the ignition timing of an internal combustion engine and the increase correction of the target r.p.m. of a continuously variable transmission, and the selected control is executed, whereby the fuel consumption of the engine is relieved from worsening in a control for the prevention of knocking or for the suppression of NOx in emission.

Abstract: A raster scanable number is representative of a number of raster scans that can be performed with dot image data stored in a print image buffer. A raster scanned number is representative of a number of raster scans actually performed by a print mechanism. The raster scanable number and the raster scanned number are compared to detect an occurrence of a print overrun. When the print overrun is detected, the data processing load imposed when compressed print data received from an external unit is decoded is calculated, and the storage capacity of the print image buffer is expanded to a degree determined according to the data processing load thus calculated. Therefore, even when the data processing load is large, such as during encoding processes, so that dot image data developing processes are delayed, the print image buffers will not be emptied of dot image data for printing and printer overrun can be prevented to a very high level.

Abstract: In a control system for a laser printer, an AND gate is connected to a circuit system extending from a DC controller circuit to a driving circuit for a laser diode. A mask signal of "L" level is output from the port OPM of the DC controller circuit to the AND gate when a print stop key on an operation panel is switched on. Thereby, the print operation of a print mechanism is immediately stopped. This efficient method of interrupting printing prevents toner from being wasted on a printing error and allows immediate interruption when a printing error is discovered.

Abstract: There is disclosed a printing apparatus implemented as a laser printer capable of changing the print format when outputting print data. When the operator changes the print format at the printer, the CPU changes the print data in a text buffer of a built-in RAM according to the changed print format, the data being converted into image data in a dot pattern for storage into an image buffer. The operator then pushes a reprint key, causing the CPU to read the pages of print data stored in the image buffer for outputting to a laser printer engine via a printer engine interface for reprinting. The printing apparatus allows the print format to be changed easily for efficient reprinting of the last print data in the new format without the need for the host computer to supply the same print data again.

Abstract: A hydraulic control apparatus for controlling a vehicle power transmitting system including a belt-and-pulley type continuously variable transmission and a torque converter provided with a lock-up clutch. The transmission includes a pair of hydraulic actuators one of which receives a belt tensioning pressure for controlling a tension of a transmission belt.

Abstract: A hydraulic control apparatus for a power transmitting system including a continuously variable transmission, a reversing device, and an auxiliary transmission, which apparatus includes: a solenoid valve for generating a pilot pressure for selectively placing the auxiliary transmission in high- and low-gear positions; high-gear and low-gear control valves normally operable based on the pilot pressure, to control high- and low-gear coupling devices of the auxiliary transmission to establish the high- and low-gear positions. The low-gear control valve is operated to engage the low-gear coupling device, when the low-gear control valve receives a pressure to be applied to the reversing device for forward run of the vehicle. The high-gear control valve may be operated to release the high-gear coupling device, when a thrust based on a pressure applied to the low-gear coupling device exceeds a predetermined value.

Abstract: A hydraulic control apparatus for controlling a belt-and-pulley type continuously variable transmission of a motor vehicle having an engine, which transmission includes a pair of hydraulic actuators one of which receives a belt tensioning pressure for controlling a tension of a transmission belt. The hydraulic control apparatus includes an engine-output detecting valve for generating an engine output pressure indicative of a currently required output of the engine, a solenoid-operated valve for regulating a modified engine output pressure based on the engine output pressure generated by the engine-output detecting valve, and a pressure regulating valve for regulating the belt tensioning pressure based on at least the modified output pressure. The modified engine output pressure is obtained so that the belt tensioning pressure is controlled to an optimum level.

Abstract: A hydraulic control apparatus for controlling a continuously variable transmission of a motor vehicle, which transmission includes a first and a second shaft, a pair of variable-diameter pulleys provided on the first and second shafts, respectively, a transmission belt connecting the pulleys, and a pair of hydraulic actuators one of which receives a belt tensioning pressure for controlling a tension of the belt. The hydraulic control apparatus includes a reversal detecting device for determining whether a rotating direction of the pulleys has been reversed or not, and a pressure increasing device for temporarily increasing the belt tensioning pressure when the reversal detecting device detects reversal of the rotating direction of the pulleys.

Abstract: A hydraulic control apparatus for a vehicle continuously variable transmission including a pressure regulating valve having a valve spool which operates depending upon a determined current speed ratio of the transmission and a currently detected required output of the vehicle engine, to generate a controlled belt tensioning pressure for controlling the tension of a transmission belt at a required minimum level. The apparatus further includes a device responsive to an electric signal, for generating a pilot pressure to be applied to the valve, and an electronic control device for calculating a basic output pressure of the valve, based on the current speed ratio and the currently required output, according to a stored predetermined relationship among these two parameters and the basic output pressure, to determine the electric signal so that the belt tensioning pressure coincides with the optimum value.

Abstract: An apparatus for controlling a power transmitting system for an automotive vehicle having a continuously variable transmission including an actuating device for controlling a speed ratio thereof, the transmission transmitting power from an engine to drive wheels. The apparatus includes a device for determining a running speed of the vehicle, a device for determining a deceleration value of the vehicle, and a controller for determining a deceleration reference value based on the determined vehicle speed, and according to a predetermined relationship between the determined vehicle speed and the deceleration reference value. If the deceleration value exceeds the reference value, the controller commands the actuating device of the transmission to lower the speed ratio in a rapid shift-down mode.

Abstract: A hydraulic control apparatus for a power transmitting system for an automotive vehicle having a continuously variable transmission which has a first and a second shaft, a pair of variable-diameter pulleys provided on the first and second shafts, a belt connecting the pulleys, and a pair of hydraulic actuators for changing diameters of the pulleys, wherein a tension of the belt is controlled by regulating an actuating pressure in a driven side actuator of the hydraulic actuators which is provided on a driven one of the two shafts. The apparatus includes a pressure regulating valve which has a valve spool for regulating the actuating pressure in the driven side actuator, and a pressure-reducing chamber for receiving a pressure-reducing pilot pressure for biasing the spool for reducing the actuating pressure.

Abstract: A hydraulic control apparatus for a vehicle power transmitting system having a continuously variable transmission having a first and a second shaft, a pair of variable-diameter pulleys provided on the shafts, a belt connecting the pulleys, and two hydraulic actuators for changing diameters of the pulleys.