초록 ▼

A method is provided for controlling an engine using a continuously variable transmission whereby the fuel consumption of the engine is decreased. When an accelerator of the engine is displaced, first and second desired engine speeds are determined for steady state conditions before and after the di

A method is provided for controlling an engine using a continuously variable transmission whereby the fuel consumption of the engine is decreased. When an accelerator of the engine is displaced, first and second desired engine speeds are determined for steady state conditions before and after the displacement of the accelerator, respectively. The difference between the two desired engine speeds is calculated and compared with a predetermined value. If the difference between the desired engine speeds is smaller than the predetermined value, the actual engine speed is adjusted to gradually approach the second desired engine speed. If the difference between the two desired engine speeds is larger than the predetermined value, the actual engine speed is immediately adjusted to a transient value and is then adjusted to approach the new desired engine speed gradually.

대표청구항 ▼

A method for controlling an actual engine speed in a motor vehicle comprising a continuously variable transmission, the transmission having a driving pulley comprising a fixed member and a movable member, the movable member being actuated by a hydraulic cylinder to form a V-shaped opening between th

A method for controlling an actual engine speed in a motor vehicle comprising a continuously variable transmission, the transmission having a driving pulley comprising a fixed member and a movable member, the movable member being actuated by a hydraulic cylinder to form a V-shaped opening between the movable member and the fixed member, a driven pulley with another fixed member and another movable member, the another movable member being actuated by another hydraulic cylinder to form another V-shaped opening between the another movable member and the another fixed member, a flexible belt member spanning the pulleys, and an electronic control means, the electronic control means includes a memory means for storing a relationship between a plurality of desired engine speeds and throttle openings, said electronic control means for controlling pressure in the hydraulic cylinders according to an optimal desired engine speed of the engine, the method comprising the steps of: detecting first and second amounts of a throttle opening, the first amount of the throttle opening detected being an initial amount before a change in the throttle opening, the second amount of the throttle opening being an amount after the change in the throttle opening; determining a first desired engine speed for steady state conditions before said change in the throttle opening and determining a second desired engine speed for steady state conditions after said change in the throttle opening, said first desired engine speed being determined from said detected first amount of said throttle opening in accordance with said relationship stored in said memory means, said second desired engine speed being determined from the detected second amount of said throttle opening in accordance with said relationship stored in said memory means; calculating a difference between said first desired engine speed and said second desired engine speed; comparing said difference between said first desired engine speed and said second desired engine speed with a predetermined value; adjusting said actual engine speed in accordance with said comparison, whereby when said difference is smaller than said predetermined value, said actual engine speed is adjusted to approach said second desired engine speed gradually, and when said difference is larger than said predetermined value, said actual engine speed is immediately adjusted to a transient value and then is adjusted to approach said second desired engine speed gradually.