The number of electronic elements on today’s vehicles is soaring, and operators are being challenged to manage the many functions they bring. Bosch Rexroth is addressing each of these trends with controllers that offer high I/O counts and advanced graphics capabilities.
Focusing on vehicles that offer hydrostatic regenerative braking, electrohydraulic flow matching, and “shift-on-the-fly” gear shifting, the BODAS RC36-20 controller provides 125 input and output channels and four CAN bus interfaces. It is powered by a 32-bit Infineon TriCore chip that runs at 150 MHz, offering parallel processing and floating-point math. The chip provides the necessary performance for demanding applications such as load torque limiting in crane applications, while simultaneously performing all other necessary functions for the working and drive hydraulics.
In some applications, the controller’s speed lets engineers replace two circuit boards with a single RC36-20. It can work with intelligent sensors such as the DSM1-10 speed sensor.
The TriCore chip is also the core of the DI3 display system, which includes a 6.5-in, 640 x 480 pixel display. Compact, light-sensitive cameras give operators visibility into areas that are difficult to see. The display also provides a jog dial and six configurable function keys.
“The DI3 has two 32-bit processors, one for graphics and a 32-bit TriCore for interfaces,” said Terry Hershberger, Application Engineering Manager at Bosch Rexroth. Using a dedicated graphics processor lets Bosch display multiple pictures or gauges and eliminates ghosting even when real-time graphics are displayed, he added.
The latter trait makes the screen suitable for displaying dynamic tachometer images, for example. Dual backlights help readability even in bright sunlight.
The user interface employs Microsoft Windows-based programming so operators can easily run through menus. That user interface runs atop a reliable operating system.
“We have an operating system on all our controllers. That adds to safety and reliability,” said Hershberger. All the components of the two systems operate at a temperature range of -22 to +185°F (-30 to +85°C).