IMPROVED PARK POSITION LOCKING SYSTEM FOR AUTOMATIC TRANSMISSION SHIFTER

摘要

A park position locking system controls the conditions for removing an automatic transmission gearshift (90) from a PARK position. An electronic system controller (30) and the transmission controller (16) are engaged to a common data bus (18). Vehicle control system (10) comprises the electronic system controller (ESC) (30), which is the primary component of a vehicle electronic control system. ESC (30) manages and communicates with a number o f vocational controllers and executes a load management program which oversees the total load imposed on the vehicle electrical system and power train by various accessories by a standard communication protocol that may be the SAE J1939 protocol over the common data bus (18). ESC (30) is programmed to ensu re that an operator of the vehicle may not move the gearshift (90) out of a PAR K position without first depressing a service brake pedal. ESC (30) prevents o r allows movement of the gearshift through a solenoid operated locking mechani sm engaged to the gearshift (90).