Secondly the framework/console which is positioned over the test bed carrying all instrumentation and controls, air flow measurement system, fuel system with flow measurement by burette, multi-point temperature indicator together with all the electrical circuits necessary for control of the dynamometer and engine. Two main components form the basis of the test bed. First of all the welded steel baseplate complete with D.C. dynamometer, drive coupling and safety guard, spring type anti-vibration mountings, exhaust silencer, flexible pipe and provision for engine mountings.
Features:
Self-contained teaching facility
Closed loop speed control
Torque measurement by load cell
Regenerative D.C. dynamometer
Alternative engine types
Comprehensive instrumentation.
The engine can be operated as an external ignition petrol engine or an auto-ignition diesel engine. The mode of operation can be changed by a few simple conversion steps. This allows the compression ratio to be adjusted over a wide range. The key feature is that the cylinder has been modified so that its height can be adjusted along with that of the cylinder head. Major technical modifications have been made to a standard water-cooled single cylinder engine to allow demanding issues in engine technology to be investigated by experiment.
Learning Objectives/Experiments:
Influence of ignition point on fuel consumption, power output, efficiency and exhaust gas composition
Comparison of diesel and petrol cycles
Plotting of torque and power curves
Determination of volumetric efficiency and lambda (fuel-air ratio)
Energy balances
Determination of friction loss (in passive mode)
Determination of specific fuel consumption
Determination of efficiency
Influence of compression on fuel consumption,
Power output, efficiency and exhaust gas composition.
Demonstration of diesel and petrol processes on an engine with variable compression
Creation of different compression ratios using a height adjustable cylinder
Water-cooled single-cylinder experimental engine for setting up an engine test stand in conjunction .
Engine mounted on base plate
Force transmission to brake unit using claw coupling
Adjustable ignition point
Petrol mode with carburettor
Engine completely equipped with fuel lines and temperature sensors for exhaust gas and cooling water
Diesel mode with direct injection
Fuel hoses with self-sealing quick-release coupling.
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
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
Stabilisation tank for intake air
Potentiometer for continuous adjustment of braking torque
Potentiometer for continuous adjustment of braking speed
Control and load unit for prepared single-cylinder engines (two-stroke and four-stroke) with a maximum power output of 7,5kw
Measuring tube with scale and pressure sensor for manual and electronic fuel consumption measurement
Measured value displays for engine exhaust gas temperature
Measurement and display of air consumption, ambient temperature and fuel temperature
Test stand for mounting of prepared single-cylinder engines (two-stroke and four-stroke) with a maximum power output of 2,2kW
Engine started
Force transmission from engine to load unit via
V-belt drive
Vibration-dampened switch cabinet for display and control
Continuous adjustment of speed and torque using
3 supply tanks for different fuels
Stabilisation tank for intake air.
