MELROSE PARK, Ill. – Cams begone.

International recently unveiled a camless engine at its technical centre in Melrose Park, Ill., expanding on the electro-hydraulic platform at the heart of its low-pressure common rail fuel system.

Traditional diesels use camshafts and push rods to operate valves, but this prototype engine controls the timing of valves with electronics. The end result is the ability to open and close the valve an infinite number of times – offering far greater control over such things as emissions and engine braking.

It’s also expected to improve durability and driveability and reduce weight.

The end result is the product of a 1995 joint venture with Sturman Engine Systems.

“International camless engine technology represents a radical change in the way engines operate,” said Patrick Charbonneau, vice-president of engine engineering with International’s engine group. “Our electro-hydraulic technology has a proven track record of durability and reliability. We believe applying this technology to air management in diesel engines is the inevitable step to meeting customers’ needs while achieving clean-air solutions.”

In terms of driveability, the camless engine showed a 40 per cent increase in torque at clutch engagement speeds, offering a flatter torque curve. From the driver’s seat, that means smooth acceleration and fast starts. Compression brakes can also be integrated directly into the engine’s design. That could lessen brake wear and reduce maintenance costs.

When the rate of closing is actuated hydraulically, the valve compresses gently, meaning more reliable parts and less noise, according to the company. Solid-state controls also tend to be more reliable because they resist wear and can be more quickly diagnosed when compared to mechanical systems.

Weight is saved both by the elimination of the cam-shaft and add-on compression brakes, while the more efficient handling of air is expected to play a role in handling tightening emission standards.

The demonstration incorporated an International 530E diesel engine powering an International 8100 truck.

International unveiled its electro-hydraulic system in 1994, and now applies it to managing diesel engine air. It’s now offered on all International brand engines and Power Stroke designs that are made for Ford. n