Tractor Parking Brake Indicator Control Logic

The patent introduces an intermediary system that includes a controller and additional sensors (such as fifth wheel presence sensors, weight sensors, or communication sensors) that act as mediators between the fluid pressure indicator and the operator. These intermediaries provide supplementary information to distinguish between 'no trailer' and 'trailer with parking brake applied' conditions, thereby maintaining indicator reliability while eliminating false alarm distraction.

The system changes the parameters used for indicator control from relying solely on fluid pressure levels to using multiple parameters including fifth wheel presence detection, weight measurements, communication signals from the trailer, or combination thereof. This multi-parameter approach allows the system to maintain accurate parking brake status indication while distinguishing bobtail operation from actual parking brake application, thereby eliminating operator distraction.

The patent applies multi-functionality by using existing tractor components and sensors for multiple purposes. For example, the fifth wheel presence detection system originally designed for coupling detection is also used to determine whether to deactivate the parking brake indicator. Similarly, weight sensors originally for load measurement are reused for indicator control logic. This approach reduces system complexity by leveraging existing multi-functional components rather than adding dedicated new sensors.

The system uses self-service by having the tractor's existing sensor network and control units perform the additional function of determining indicator status. The controller that already manages braking systems now also evaluates fifth wheel presence, weight, or communication signals to control the indicator. This self-service approach minimizes added complexity by utilizing existing system resources for the new dual-purpose control function.