Protection against rolling for motor vehicles fitted with an automatic transmission, uses fixed sequence of starting and gear engagement to ensure gearbox is in determinate state at starting

摘要

The engagement of a gear ratio is activated by a controller (2) responding to vehicle operating variables. The controller actuates engagement of a drive ratio (D,R) when the vehicle is at low speed or after the driver has turned on the ignition and has selected a drive ratio. At starting, the brakes are held on for a short time and the driver alerted if the drive is not engaged.