DESCRIPTION

The Armfield CM20 Single Cylinder Engine Range provides a self-contained engine test rig that enables students to investigate a range of engine performance characteristics.

The unit is designed to be linked to the user’s computer or touch screen, linked to Armfield’s supplied software with sophisticated control and data acquisition.

The Armfield CM20 is a self-contained integrated, single-cylinder engine, dynamometer and instrumentation system, based on a range of gasoline and diesel industrial engines.

The CM20 utilises an eddy-current dynamometer to provide a variable load on the engine, enabling the characteristic power and torque curves to be reproduced in the laboratory dependent upon which sensor options are ordered. This multi-purpose test rig is designed to accept a series of Armfield gasoline and diesel engines available separately. The system comes complete with instrumentation, including rpm measurement, torque (from which power can be calculated), airflow and exhaust temperature. Other optional sensors can be purchased to further enhance the teaching capabilities of the CM20 including cylinder pressure sensors and fuel consumption.

The whole system is designed to be linked to a computer using the software provided. This provides real-time monitoring of the various sensors, with a wide range of data logging and graphical display options. Both the dynamometer and throttle can be controlled electronically, which makes installation into a closed test cell straightforward, and enables remote operation.

The CM20 should be installed in a well ventilated area with exhaust gas extraction facilities. The unit is supplied on wheels for ease of movement; these can be removed and the unit bolted to the floor for permanent installation.

Apart from the master on/off switch, everything can be controlled remotely, enabling the engine to be installed in a dedicated test cell and operated from outside the cell.

TECHNICAL SPECIFICATIONS

ENGINE SPECIFICATION

Petrol engine – CM20-10

• Single-cylinder air-cooled four-stroke OHV
• Power output: 4.8HP (3.5kW)
• Displacement: 163cm³

Diesel engine – CM20-20

• Single-cylinder, direct-injection air-cooled diesel engine
• Power output: 4.8HP (3.5kW)
• Displacement: 243cm³

Dynamometer data – CM20

• Dynamometer type: Eddy current
• Cooling: Air-cooled

EPERIMENTAL CONTENT

• Plotting of torque and power curves
• Determination of specific fuel consumption (option)
• Determination of volumetric efficiency and lambda (fuel-air ratio)
• Determination of the frictional power of the engine
• Cylinder pressure measurements
• Definition and use of an electronic cylinder pressure indication system (option)
• P-V diagram (optional sensor required)
• Exhaust calorimetry

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