Apparatus for synchronizing the rpm of drive wheels of a motor vehicle upon starting

US4805965A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Wolf-Dieter Jonner · Freising, DE
• Guenter Kaes · Stuttgart, DE
• Wolfgang Maisch · Schwieberdingen, DE
• Alwin Stegmaier · Schwieberdingen, DE

Key dates

• Filing date: Mar 3, 1988
• Grant date: Feb 21, 1989
• Expiry date: Mar 3, 2008

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B60T8/489
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

In a so-called starting aid for motor vehicles, synchronism in the rpm of the drive wheels during starting is provided by feeding a brake pressure derived from the rpm difference of the drive wheels into the wheel brake cylinder associated with the wheel having the higher rpm. To this end, one brake pressure controller having a control piston and a valve is installed in each brake line to the wheel brake cylinders of at least two wheel brakes. The control pistons are actuated in opposite directions via a final control element to which a control signal derived from the rpm difference is supplied. Upon displacement, whichever control piston is driven closes the valve and feeds brake pressure into the associated wheel brake cylinder. In order that the starting aid will have a high control speed and a small structural volume, the final control element is embodied as an electric control motor.