Efficient H1 pumps and motors lead the way

1st Quarter 2011 Electrical switching & drive systems & components

With the arrival of the new engine emission and machine safety regulations, design engineers have plenty to consider.

They have to contend with Tier 3 & 4/Euro Stage III & IV as well as the revised European Machinery Directive 2006/42/EC. Sauer-Danfoss is able to help companies through the transition with a range of transmission solutions which speed up system development and qualification, increase overall vehicle efficiency and performance, and reduce installation and life cycle costs.

The H1 family includes both single and tandem pumps, which are now available with embedded SIL 2 certified electronic automotive control (Safety Integrity Level 2 according to IEC 61508). It also includes a growing range of exceptionally efficient bent axis motors.

Improved fuel economy

Test results have shown that at 2000 rpm and 200–300 bar, the H1 bent axis motor has a 6% efficiency gain (equivalent to 5,5 kW) at maximum displacement compared to the nearest comparable product with a lower angle range and fewer pistons. The H1 efficiency was measured against the newest comparable products on the market using the same test stand and equipment as the H1 motor. This translates to improved fuel economy and a reduction in power losses. The gain can be utilised to either increase vehicle productivity or reduce the heat load placed upon the vehicle cooling system.

A 5,5 kW reduction in power loss over 1000 working hours equates to a fuel cost saving of R14 000 a year at current prices and a 3,5 ton reduction in carbon dioxide output. In the case of multiple hydrostatic units in the drive train, for example a typical dual path or multimotor system, operating cost savings can easily reach R45 000 a year.

Maximised vehicle performance

In addition to the efficiency advantages of the H1 bent axis motor, the H1 pump is designed to reduce rotating group, control and charge pump losses.

This also helps to save on fuel consumption and frees up power for other vehicle functions.

“By making hydraulic components more efficient through the reduction of unit power loss in pumps, we are in effect improving overall performance by maximising the transmission performance without compromising other features,” says Branko Horvat, marketing manager for Sauer-Danfoss.

Reduced development time and costs

The H1 AC features robust electronics mounted directly on the pump. The embedded controller incorporates additional watchdog circuitry, which provides real-time fault monitoring of the electronic hardware. Combined with optional software to monitor redundant human machine interface input channels, H1 AC provides single fault tolerance for AC vehicle transmission systems, with programming to bring the pump to a defined safe state in the event of signal loss or interruption.

The H1 AC solution is SIL 2 certified by Technischer Überwachungs-Verein Nord (TUV). This enables OEMs to comply with the new safety legislation and reduces the cost and time required for system qualification and vehicle certification.

Faced with increasingly stringent engine emission regulations and new European safety legislation, OEMs require solutions that can help reduce vehicle emissions, improve safety, enhance fuel economy and increase productivity. The H1 family from Sauer-Danfoss enables them to meet these challenges head on.

For more information contact Ron Sheehan, Sauer-Danfoss Hydraulics, +27 (0)11 803 8390, [email protected], www.danfoss.co.za

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