Method for operating a motor vehicle having a continuously variable transmission by continuously changing the transmission ratio or detecting if a braking operation is present and continuously adjusting the transmission

US5514050A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Peter Bauerle · Ludwigsburg, DE
• Gerhard Keuper · Leonberg, DE
• Joachim Luh · Bietigheim-Bissingen, DE
• Karl-Heinz Senger · Farmington Hills, US
• Peter Weiberle · Sachsenheim, DE

Key dates

• Filing date: Mar 31, 1994
• Grant date: May 7, 1996
• Expiry date: Mar 31, 2014

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02T10/40
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

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 define a brake-supporting mode of operation; and/or, continuously changing the gear ratio of the transmission by means of a manually operated actuating device with the change b…