Features & Benefits

CCB II is a network-based, electronic air brake system designed for mainline freight and passenger locomotives. It is LSI (Locomotive Systems Integration) compliant, and designed for best-in-class reliability.

CCB II utilizes a line-replaceable unit (LRU) design approach that minimizes spare parts inventory, reduces operating and maintenance costs, and increases locomotive availability. Each LRU module contains self-diagnostic capabilities embedded within its microprocessor.

CCB II incorporates a number of redundant functions, and has the unique ability to identify, reconfigure, and backup key component failures, delivering exceptional mission reliability. The three primary systems are—

Electronic Brake Valve (EBV)

The ergonomically designed EBV is the interface between the brake system and the locomotive engineer, and features either a desktop or AAR-stand installation. An easy-to-read digital display provides instantaneous information on the equalizing reservoir target pressure. This feature avoids the feedback delays inherent in other systems, and allows the locomotive engineer to exercise precise brake control. As a fail-safe design, the EBV permits direct-acting emergency venting of the brake pipe.

Integrated Processor Module (IPM)

The IPM manages the electronic interfaces between the brake system elements and the engineer's display. It communicates with the locomotive on-board computer and interfaces with electrical train lines. The IPM also communicates with a portable test unit (PTU) for troubleshooting and system diagnostic tests. With the appropriate hardware and software conversions, the IPM serves as the computer in a Locotrol™ distributed power application.

Electro-Pneumatic Control Unit (EPCU)

The EPCU manages the pneumatic interfaces between the locomotive brake system and the consist. It controls the locomotive's brake cylinders, brake pipe, independent application and release pipe, and the actuating pipe. The heart of an EPCU's pneumatic circuit is Knorr's patented Analog Converter. These converters utilize pulse-width modulation to provide highly accurate and stable control of equalizing reservoirs, brake cylinder pilots, and independent application and release pipe pressures. A redundant pneumatic backup system is integrated into the EPCU, which provides backup for partial loss of computer control in the lead locomotive, or functions in the trail mode when the system is unpowered.

Networked Modules

One of the keystones of the CCB II design is the application of Echelon® LonWorks™ network technology to interconnect electro-pneumatic modules. These modules, also referred to as line-replaceable units (LRUs), are in a constant state of communication with one another, actively controlling a number of functions. Collectively, these networked modules provide faster response time, simplified troubleshooting, and easier train setup. The LRU systems approach minimizes spare parts inventory, and reduces operating and maintenance costs, while increasing train availability.