A method of controlling speed reduction ratio in a continuously variable speed transmission comprises the steps of setting a prescribed value of a parameter representing a driver's intention of acceleration and corresponding to an accelerator opening which is opened to a certain extent from a fully closed condition, setting a reference engine speed corresponding to the parameter so as to increase as said parameter increases from said prescribed parameter value when said parameter is in a range higher than said prescribed parameter value, setting said reference engine speed so as to increase as said parameter decreases from said prescribed parameter value when said parameter is in a range lower than said prescribed parameter value, and controlling said speed reduction ratio so that the engine speed coincides with said reference engine speed.

Method of controlling speed reduction ratio in a continuously variable speed transmission

The invention relates to the adjustment of the gear ratio of a continuously variable transmission with a primary and a secondary side, which is arranged between the motor of the vehicle and the driving wheels. According to the invention, means are provided to determine a given or predefined state of deceleration of the vehicle. Upon reacting to the determination of such a state of deceleration, the output speed of the vehicle motor is adjusted or regulated depending on the detected speed of the primary side. According to the invention, whenever specially significant deceleration at low speeds (30 to 60 km/h) occurs, the vehicle with a CVT transmission will come to a stop at a gear ratio close to the starting gear ratio. Furthermore, the motor can be fired with fuel in order to increase the feed volume of the hydraulic pump without having to fear that the motor of the vehicle will produce a force on the wheels countering the braking effect.

Device and method for adjusting the transmission ratio of a CVT

A controlling device for controlling the transmission ratio of a non-stage transmission in a vehicle. The transmission ratio is controlled according to a forecast output power of the vehicle. The output power is forecast based on an operating condition of the vehicle, such as atmospheric pressure. The control considers various operating parameters. A comparison of a predetermined ratio of increase of engine speed or throttle opening with actual ratios of increase of engine speed or throttle opening may be made in controlling the transmission ratio. An uneven road surface is detected and a transmission ratio of the transmission is controlled accordingly to substantially eliminate hunting. An engine speed is controlled so that the engine speed may not exceed a predetermined rotational speed when the transmission gear ratio is fixed. A target engine speed or target transmission ratio is corrected in response to an output signal of a comparison device which compares an actual vehicle velocity with a set vehicle velocity during automatic fixed vehicle velocity running.

Controlling device for non-stage transmission for vehicles

A system for controlling a friction clutch of a motor 
vehicle having a continuously variable transmission is disclosed. 
The system has an actuator (8) for shifting the clutch plate. The 
operator's intention to start the 
vehicle is detected (20, 21) in accordance 
with a first depression of an accelerator pedal. In response to the 
vehicle start intention signal (42), the actuator operates to shift the 
clutch plate to a partially engaged position. The clutch plate is 
kept at this position and the clutch plate is then shifted from the 
partially engaged position to a completely engaged position, when the 
transmission is upshifted.

Control system for a clutch of a motor vehicle

A uniaxial gas turbine system, comprising a uniaxial gas turbine, a rotary machine driven by the uniaxial gas turbine, a continuously variable transmission for transmitting a driving force from the uniaxial gas turbine to the rotary machine, and a control device for controlling the speed of the uniaxial gas turbine to an optimum speed and controlling the gear ratio of the continuously variable transmission so that the speed of the rotary machine becomes a prescribed speed, whereby the speed of the gas turbine or the rotary machine can be optimized according to the load variation of the rotary machine driven by the gas turbine.

Uniaxial gas turbine system

A control system and method for a power delivery system, such as in an automotive vehicle, having an engine coupled to a continuously variable ratio transmission (CVT). Totally independent control of engine and transmission enable the engine to precisely follow a desired operating characteristic, such as the ideal operating line for low fuel consumption. CVT ratio is controlled as a function of commanded desired system performance (e.g., power or torque) and measured actual system performance, such as CVT torque output, while engine fuel requirements (e.g., throttle position) are strictly a function of measured engine speed. Fuel requirements are therefore precisely adjusted in accordance with the ideal characteristics for any load placed on the engine. Appropriate controls prevent anomalous engine and vehicle behavior, and allow for transient start-up from rest. In order to counteract the inherent tendency of the vehicle to accelerate when the accelerator pedal is released, a microprocessor is provided for decreasing the fuel flow to the system prime mover upon a commanded decrease in power delivery.

System for utilizing the negative torque of a power delivery system having a continuously variable ratio transmission for braking

PURPOSE:To realize a restriction of acceleration tendency of engine, a low cost, a high response, and a precise fuel reduction control, with a minimum composition elements of a CVT control system, by applying a microprocessor, simplifying the mechanism, and designing an optimum algorithm. CONSTITUTION:An engine 10 is linked to a CVT 14 through a clutch or a fluid coupling, and the power and the torque are transmitted from the engine 10 and the CVT 14 through an output shaft 16. And, in a CVT ratio controller 17, the CVT ratio is produced as a command output or a torque function which commands the variation rate of the CVT ratio signal kR' depending on a measurement output torque To from a torque sensor 19 and by an accelerator pedal 18. On the other hand, the engine control is carried out in adjusting a fuel feeding device 12 by an engine control device 100 depending on the engine rotation speed NE. In this case, the fuel control is made to follow the operation feature of a low fuel expense ideal engine operation line and the like. The above controls are performed by a minimum composition elements, applying a microprocessor, and, a restriction of acceleration tendency of engine, a high response, and a fuel reduction control are realized.

Device utilizing negative torque for braking of power transmission gear with continuously variable transmission

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System for utilizing the negative torque of a power delivery system having a continuously variable ratio transmission for braking

Device utilizing negative torque for braking of power transmission gear with continuously variable transmission