Method and device for regulating the velocity of a vehicle

US8160798B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventor

• Guenter Kettenacker · Steinheim, DE

Key dates

• Filing date: Jul 22, 2008
• Grant date: Apr 17, 2012
• Expiry date: Feb 15, 2031

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B60W10/196
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

A method and a device are described for regulating the velocity of a vehicle, which include a hysteresis function and prevent an unwanted activation and deactivation of the engine brake. For this purpose, a setpoint velocity (V-setpoint) of the vehicle is predefined. An actual velocity (V-actual) of the vehicle is detected and, as a function of the difference between the actual velocity (V-actual) and the setpoint velocity (V-setpoint), an output quantity (Msetpoint) of a drive unit of the vehicle is predefined in such a way that the actual velocity (V-actual) is approximated to the setpoint velocity (V-setpoint). A first lower limiting value (uG1) for limiting the output quantity (Msetpoint) toward the lower end is predefined as long as the actual velocity (V-actual) exceeds the setpoint velocity (V-setpoint) by less than a first predefined threshold value (offs1). When the actual velocity (V-actual) exceeds the setpoint velocity (V-setpoint) by more than the first predefined threshold value (offs1), the first lower limiting value (uG1) is replaced by a second lower limiting value (uG2) for limiting the output quantity (Msetpoint) at the lower end, this second lower limiting value…