Multiplexed electrical wiring system for a truck including driver

Abstract

The land vehicle electrical system comprises a cab controller including a microprocessor system and a chassis controller including a microprocessor system. The microprocessor systems have a multiplexed coupling therebetween and each system includes a microprocessor substantially identical to the microprocessor in the other system with the hardware in each system being substantially identical and with each microprocessor having slightly different software. The microprocessor utilized in the chassis controller has analog inputs for direct connection to sensors. A public data link and a private data link are provided between the microprocessors for additional and backup communication between them. Smart switches are coupled to one or both of the microprocessors and each switch includes means for indicating its status, open circuit or closed circuit, to a microprocessor and the microprocessor includes means for reading the status of the switch and for controlling the status of the switch. The microprocessor also have a diagnostic routine for diagnostic capability or fault isolation. Furthermore, the cab controller includes a visual display having touch actuated switch function areas on the screen of the visual display which switch function areas can be actuated to call up different menus and different control panels.