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This test stand measures the power output of internal combustion engines delivering up to 7,5kW. The complete test stand consists of two main elements: The CT 110 as the control and load unit and a choice of engine: four-stroke petrol engine (CT 100.20), two-stroke petrol engine (CT 100.21) and two four-stroke diesel engines (CT 100.22, air-cooled with direct injection; CT 100.23, water-cooled with indirect injection).
The main function of the CT 110 is to provide the required braking power. The brake unit is an air-cooled asynchronous motor with an energy recovery unit. The torque and speed are generated by way of a frequency converter. The energy recovery of the braking energy into the system provides for highly energy-efficient operation of the test stand. The torque is measured by means of a suspended brake unit and force sensor.
The engine is mounted on a vibration-insulated base plate and connected to the asynchronous motor. The mass of the base plate in conjunction with the soft bearing support ensures that the test stand runs very smoothly, so there is no need for a solid foundation.
The asynchronous motor is initially used to start the engine. As soon as the engine is running, the asynchronous motor and energy recovery unit act as a brake unit for applying a load to the engine. The braking power is fed back into the electrical system.
The lower section of the mobile frame contains fuel tanks and a stabilisation tank for the intake air.
The air consumption is measured by way of a measuring nozzle. The fuel consumption is measured by way of the level in the vertical pipe.
The switch cabinet contains digital displays for the speed, torque and temperatures (one display for engine cooling water inlet and outlet and one display for exhaust gas, fuel and intake air). Pressure gauges indicate negative intake pressure and air consumption. The measured values are transmitted directly to a PC via USB. The data acquisition software is included.
The well-structured instructional material sets out the fundamentals and provides a step-by-step guide through the experiments.
Learning Objectives / Experiments
In conjunction with an engine (CT 100.20 - CT 100.23)
- plotting of torque and power curves
- determination of specific fuel consumption
- determination of volumetric efficiency and lambda (fuel-air ratio)
- determination of the frictional power of the engine (in passive mode)
 control and load unit for prepared single-cylinder engines (two-stroke and four-stroke) with a maximum power output of 7,5kW
 asynchronous motor with energy recovery unit as brake generates engine load
 engine started by asynchronous motor
 force transmission from engine to brake via elastic claw coupling
 vibration-insulated base plate for engine mounting
 stabilisation tank for intake air
 potentiometer for continuous adjustment of braking torque
 potentiometer for continuous adjustment of braking speed
 measurement and display of torque, air temperature, air intake quantity, negative intake pressure, speed, fuel consumption, fuel temperature
 measured value displays for engine: exhaust gas temperature and cooling water temperatures
 GUNT software for data acquisition via USB under Windows Vista or Windows 7
Asynchronous motor as brake
- power output: approx. 7,5kW at 2900min-1
Energy recovery unit: 13kW
- torque: -50...50Nm
- speed: 0...5.00min-1
- fuel consumption: 50cm³/min
- engine intake pressure: -400...0mbar
- air consumption: 0...690L/h
Dimensions and Weight
Weight: approx. 245kg Required for Operation
400V, 50/60Hz, 3 phase or 230V, 60Hz/CSA, 3 phase
Ventilation and exhaust gas routing required
Scope of Delivery
1 test stand (without engine)
1 GUNT software CD + USB cable
1 set of connecting hoses + tools