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Dynamic machine control

Mobile valve with independent metering

Eaton announced the CMA advanced mobile valve with independent metering which offers manufacturers possibilities to differentiate machine capabilities. CANopen and J1939 are provided.

The valve comes with a CANopen and J1939 interface (Photo: Eaton)

The CAN-enabled electrohydraulic mobile valve features on-board electronics and sophisticated software algorithms, which surpasses industry standards for intelligence, capabilities, dynamics, and control. “Eaton’s new CMA Advanced Mobile Valve with Independent Metering dramatically streamlines and simplifies everything, from design and setup to operation and optimization,” said Shelley Nation, CMA Lead Engineer, Mobile Valves, Eaton. “Mobile equipment manufacturers are looking for products that enhance productivity and efficiency, maintain a competitive cost structure and provide real-time data.”

The valve’s software-driven setup reduces design and build costs and speeds time to market. Combined with Eaton’s Pro-FXTM family of electronic controls and software, the valve integrates with controls and allows performance optimizations to be made and tested in seconds instead of months. Pre-built software libraries and industry-standard protocols such as J1939 and CANopen also can reduce development time.

As part of Eaton’s (Germany) advanced class of Dynamic Machine Control solutions, the CMA valve empowers original equipment manufacturers (OEMs) to impact and improve every phase of the machine life cycle. The valve provides features such as:

Improve controllability using advanced control algorithms which can be configured, on the spot, to a customer’s machines specific setup. Additionally, with independent metering, which allows for independent meter-in and meter-out, there is load control under any load conditions. The valve enables the ability to switch between velocity and force control modes. Faster commissioning is made possible by a software interface which enables users to set up and tune the valve rather than swapping parts.

Real-time diagnostics are shared from on-board sensors which monitor pressure, temperature, position and flow, helping to detect and troubleshoot issues as they arise. Hose burst detection prevents costly spills by monitoring flow to and from the service and closing the service if a leak is detected. The valve can minimize downtime with a limp mode that allows end-users, in the event of sensor failure, to work at a reduced rate until the machine can be serviced.

The CMA valve, available with rated flow of 90 liters or 200 liters per minute (LPM), improves machine performance without the need to compromise. Independent metering on the valve allows each spool to control its own work port for consistent speed and better control on services which transition between passive and over-running states. Real-time diagnostics and hose burst detection are made possible through the use of twin spool architecture, on-board sensors and data processing that provide pressure information to the user interface and implements proprietary Eaton control strategies to optimize performance.

“The independent-metering, on-board electronics, sensor feedback, and dynamic capability of the valve allow for unlimited flexibility in designing control algorithms and advanced features that can be tuned for unique applications,” said Mike Rannow, CMA Controls Engineer, Eaton. Common applications of the valve include concrete pump trucks, refuse trucks, telehandlers, all-terrain cranes, utility trucks, grapples, aerial lifts, drill rigs, excavators, roof bolters, snow groomers, paving machines, and reach stackers.


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