Verfahren und Vorrichtung zum automatischen Steuern des Übersetzungsverhältnisses eines stufenlosen Automatikgetriebes

摘要

A method for controlling a stepless automatic transmission of a vehicle and an apparatus therefore automatically control the transmission ratio according to the change with respect to time of a throttle aperture and a driving condition of the vehicle. A change with respect to time of the throttle aperture is taken into account in determining the objective engine speed and the transmission ratio. An apparatus includes a throttle sensor for sensing a change with respect to time of the throttle aperture, a first allocator for allocating an objective engine speed in a condition that the change with respect to time of the throttle aperture is within a prescribed range, a second allocator for allocating an objective engine speed in a condition that the throttle aperture is opened more rapidly than a first prescribed value, a third allocator for allocating an objective engine speed in a condition that the throttle aperture is closed more rapidly than a second prescribed value, and a transmission controller for controlling a transmission ratio of the stepless automatic transmission so that an actual engine speed coincides with the objective engine speed. A method includes the steps of sensing a change with respect to time of a throttle aperture, allocating an objective engine speed according to the change with respect to time of the throttle aperture, and controlling a transmission ratio of the stepless automatic transmission so that an actual engine speed coincides with the objective engine speed.