CAN Newsletter magazine
Replacing analog circuitry by CAN-connectable devices in pavers provided more benefits than adding of displays.
This article originally appeared in the September issue of the CAN Newsletter magazine 2018. This is just an excerpt.
The Pacific Northwest of U.S.A. is known for its rainy climate, and the infamous weather brought Carlson and HED together. Carlson was looking for an electronics solution to solve water ingress problems. Kevin Comer, Carlson’s Engineer Manager, saw HED’s demonstration of a working display module submerged in water at Conexpo, and encouraged his engineering staff to reach out. After success with a display project, Carlson and HED started to work together, most recently on Carlson’s CP-100 and the CP-130.
The CP-100 and CP-130 are commercial class pavers that feature more options than many other machines in their class. They both utilize fully electronic controls with custom legend rocker switches and twin 7-inch color touch displays for operator input. While the most commonly used functions have switches available, almost every function of the machine is accessible through the graphical user interface on the displays.
The CAN controller and software by HED replace the CP-100’s original analog circuitry and mechanical engine control. This upgrade provided benefits beyond the addition of the displays. It accommodated the increased needs of the engine control, provided more accurate control over several key functions, and eliminated time consuming calibration procedures from the traction control and steering. EPA Tier 4 legislation requires much more stringent control over the exhaust gas emissions. To accomplish this, additional components, including various actuators and sensing are required. The CAN-based controller allows Carlson to interface with the factory control system for the engine via the CAN-based SAE J1939 network. Carlson chose this avenue over the much more costly option of having a custom engine calibration created to operate with the previous analog circuitry.
The previous CP-100 system required numerous discrete components that increased failure risks. All of the wiring had to be duplicated on both sides of the machine and joined in a central control box, while avoiding backfeeds and short circuits. The (new system) eliminated redundancies, requiring only a few switches while the software does the rest. Adding auger control functionality eliminated a previous controller that costs U.S.-$ 2000 per machine. This savings alone justified the cost of purchasing the controllers.
Streamlining controllers reduced the number of harnesses and connections for less failure points. The paver went from up to eight harnesses spanning the entirety of each machine down to four dedicated ones. Not only does the controller communicate with the engine itself, it also lets mechanics connect to system diagnostics with the Conductor software. This makes troubleshooting easier and reduces time for service calls by allowing the technician to view the status of every aspect of the control system from a single concise screen.
By upgrading to an electronic control system using CAN networks, Carlson is staying on pace with industry trends. Furthermore, the upgrades eliminate the need for calibrating the steering control, which saves a minimum of two hours of calibration time per machine, and makes the process more exact.
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