Armfield Engineering Education
INTERNAL COMBUSTION ENGINES
CM12 Automotive Diesel Engine - issue 2
The Armfield CM12 is a self-contained diesel/biodiesel comaptible engine test rig which allows students to investigate typical engine performance parameters. The unit is designed to be linked to a computer and is supplied both with educational data acquisition and control software, as well as the engine manufacturers diagnostic software for monitoring the status of the Engine Control Unit (ECU)
Ordering Specification
> A 4-cylinder, water cooled, Biodiesel compatible, 1.9 litre Volkswagen
diesel engine, complete with services and ancillaries required to run the
engine in a laboratory environment
> Variable load eddy current dynamometer which acts as a brake, allowing
direct measurement of engine torque.
> Supported on strong steel framework via flexible mounts. The frame
also houses the fuel tank, battery and electrical enclosures.
> Protected by guards around the moving parts. Safety interlocks and
emergency stops are provided.
> Supplied with educational software for data logging and control
> Supplied with the engine manufacturer's diagnostic software.
> Starter, throttle and dynamometer can be controlled from a computer
> Standard instrumentation includes sensors for:
- Engine speed
- Torque
- Air flow
- Cooling water temperature (inlet and outlet of heat exchanger)
- Cooling water flow
> Optional engine indicator set for measuring cylinder pressure through
the cycle
Features
> 4-cylinder (Biodiesel Compatible) automotive engine
> Eddy current dynamometer to vary engine load
> Plotting of characteristic torque and power curves against engine speed
> Full software control of system, including load and throttle settings
> Closed loop software control of brake loading to maintain constant
engine speed during measurements
> Secondary water cooling by heat exchanger, with measurement of temperature
change and flow rate
> Engine manufacturer's diagnostic software (displays fuel injection
characteristics)
> Remote emergency stop, and facility for safety interlocks
> Optional measurement of cylinder pressure, and displaying this on a
p-v diagram
Description
CM12 is a self-contained integrated multi-cylinder engine, dynamometer and instrumentation system. It is based on a 1.9 litre, 4 cylinder automotive diesel engine as used in Volkswagen cars. This engine is a modern design, with electronic engine management of fuel injection settings.
An eddy current dynamometer provides a variable load on the engine, allowing the characteristic power an d torque curves to be reproduced in the laboratory. The system comes complete with extensive instrumentation, including rpm measurement, torque (from which power can be calculated), plus various temperatures, pressures and flows (see Technical Specification)
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. The dynamometer and throttle can both be controlled electronically from the software, which makes installation into a closed test cell very straightforward, and allows for remote computer operation.
A safety ‘watchdog' facility ensures the system shuts down safely in the event of computer failure or software lock-ups. The interfaces are compatible with packages such as LabView and MatLab for users who wish to provide their own control and monitoring software. A further advantage of the computer control is that stable rpm readings can be easily achieved using the closed loop control function on the dynamometer drive.
A closed loop primary water-cooling system is incorporated, complete with
a heat exchanger for connecting into a secondary cold water supply.
Technical Data
Engine Data
Engine Model: Volkswagen ADG
Displacement: 1896cc
Bore: 79.5 mm
Stroke: 95.5 mm
Cylinders: 4
Nominal Power: 44 KW @ 3600 rpm
Nominal Torque: 130 Nm @ 2200 rpm
Dynamometer Data
Dynamometer type: Eddy Current
Cooling: Air cooled
Max Power: 55 kW for 20 minutes
Instrumentation and Sensors:
Engine speed counter
Load cell to measure torque
Inlet air flow measured by orifice plate
Inlet air temperature
Secondary cooling water flow and temperatures (inlet and outlet)
The VW diagnostic software can also be used to monitor a wide range of engine
functions. In particular the injection characteristics can be used to establish
the fuel consumption rate.
Options
CM12-12 Engine Indicator Set
The engine indicator set comprises a high temperature pressure sensor installed
into one of the cylinders in place of the glow plug. A separate charge amplifier
provides signal conditioning to generate a voltage which can be logged on
the computer. A special routine in the Armfield software allows for the
high speed data acquisition of this signal, and automatically plots the
results on a p-v diagram.
Essential Equipment
The user must have access to one or two PCs (according to preference).
One free USB port is required to run the Armfield data logging and control
software, and one serial COM port is required to run the ECU software. The
operating system requirements are Windows 98, 2000, ME or XP.
requirements
Installation and Services
The CM12 should be installed in a well ventilated area with exhaust gas extraction facilities. The unit is supplied on wheels for ease of movement, but it is recommended that the wheels are removed and the unit bolted to the floor for permanent installation.
Apart from the master on/off switch, and the cooling water, everything
can be controlled by computer, allowing the engine to be installed in a
dedicated test cell, and operated from outside the cell. It is supplied
with a 5 metre USB lead, giving a maximum distance between the unit and
the controlling computer of approx. 4 metres.
Electricity:
220-240V, single phase, 10 Amp
Cooling water:
6 L/min at 3 bar pressure, <20ºC
Shipping Specification
Volume: 3.2m3
Weight: 550kg (approx)
Overall Dimensions
Height: 1.20m (without castors)
Width: 1.5m
Depth: 0.92m
|
 |
|---|