Abstract: A method for operating a motor vehicle such as a passenger car, which is equipped with a motor and an electronically controlled, continuously variable transmission includes the steps of: detecting a driving state defined by downhill travel; detecting the speed of the vehicle at the start of the downhill travel and storing the vehicle speed; continuously changing the transmission in such a manner that the vehicle speed is substantially maintained while utilizing the braking action of the motor thereby defining a downhill travel motor braking mode of operation; and/or, detecting possible slip at the wheels of the motor vehicle and adjusting a corresponding other, lower gear ratio continuously on the transmission so that the slip is reduced or is entirely eliminated thereby defining a slip-adjustment mode of operation; and/or, detecting if a braking operation is present and, during braking operation, continuously adjusting the transmission by changing the gear ratio to support the brakes of the motor vehicle to
Type:
Grant
Filed:
March 31, 1994
Date of Patent:
May 7, 1996
Assignee:
Robert Bosch GmbH
Inventors:
Peter Bauerle, Gerhard Keuper, Joachim Luh, Karl-Heinz Senger, Peter Weiberle
Abstract: A method for controlling an automatically actuated transmission for a motor vehicle, for improving behavior before curves and during braking, provides that a coasting function to suppress a shift or gear ratio changing process is initiated as soon as the accelerator pedal is quickly released. This coasting function is maintained until powered operation is again detected and the vehicle accelerates. Then a holding time is started during which the coasting function is started again as soon as the vehicle changes to coasting operation.The method is applicable to multi-step transmissions as well as continuously variable transmissions.