Daimler also is bracing for the change.
“DTNA has been laying down the groundwork to be ready for moving to 500 kBd J1939 backbone for some time,” Jong said. “Our work includes a strategy for maintaining the integrity of the data bus, increasing the vehicle’s overall reliability and enhancing ease of service.” He added that Daimler’s Freightliner M2 medium-duty hybrid trucks already are utilizing a 500 kBd bus for “sophisticated energy management functions.” Like Navistar, DTNA is also participating in the SAE study group.
“Overall, this is a positive change to the industry,” DeGrant said. “It will buy us another 10 years without having to totally redesign the vehicle network architecture.”
Fuglewicz added, “As more and more ‘smart’ devices are built into the vehicle — or are added aftermarket — with fleets wanting to know the status of these devices in real-time, the existing 250 kBd J1939 will eventually reach its limit.”
In-cab equipment maker Qualcomm Inc., San Diego, and software provider TMW Systems Inc., Beachwood, Ohio, declined to comment for this story. Truck makers Kenworth Truck Company, Kirkland, Wash.; Peterbilt Motors, Denton, Texas; and Volvo Trucks North America and Mack Trucks Inc., both located in Greensboro, N.C., also did not comment.