Engine Testing Indonesia

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The Hofmann Brake Inertia Dynamometer is arranged ‘in-line’, with the main elements being flywheel assemblies, brake test area, DC or AC machine, and a disc brake.
Construction of the Brake Inertia Dynamometer

- A system of flywheels is mounted onto a common central shaft to simulate the mass of the test vehicle
- The minimum inertia is formed by the inertia of the shafts, couplings, and disc brake
- Variable inertia is obtained by engaging the appropriate flywheels
- Precise inertia simulation is obtained by ‘trimming’ using the - DC or AC machine
- The flywheels are engaged manually with a unique support and transfer system or automatically, using electromagnetic clutches
- A headstock is provided to mount the brake drum or disc
- A tailstock is supplied to support the brake shoe or calliper assembly and to transmit the reaction torque to a high precision load cell
- Speed is measured by an optical encoder and via a tachogenerator
- The tailstock traverses on tee-slotted rails for alignment with the brake drum or calliper

Spesification

The services we offer are:

- Facilities planning and installation services
- Comprehensive in-house and/or on-site training courses
- Tailored preventative maintenance contracts
- On-line diagnostics and support VPN
- Technical Helpline Support

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Powertrain testing is undergoing radical changes, driven by the challenges which global society faces today. The need for reduced dependence on fossil-fuels and improved carbon footprints is driving changes in the technologies used in all vehicles. This, in turn, has a direct impact on approaches to the testing of powertrain components and systems.
Our powertrain test facilities benefit from the combination of our expertise and experience in engine and chassis dynamometer design and control techniques. These, along with the advanced simulations developed for our own Robot Driver and vDriver systems, ensure we are able to provide the very best solutions for powertrain and transmission testing requirements.

Powertrain test applications available include various arrangements of transmission test stands through to full powertrain test systems, with multiple dynamometers and either an engine driven input or a further AC machine. Ultimate flexibility is provided with our hybrid powertrain test facilities, enabling individual testing of prime movers, a fully synchronised test with both power sources operational and many simulations in between.

The associated control systems include full road load and inertia simulation with accurate speed synchronisation of the powertrain outputs. Additionally, several advanced features are available including full journey replay and simulation, facility services, and HIL simulation packages to ensure rapid development of powertrain systems or components.
All systems can be provided to accommodate both 2 and 4 wheel drive solutions, as well as additional replacement of prime movers for transmission only testing.
Whether the requirement is for long term durability, NVH, emissions, or driveability testing, we have the solution.

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VDriver provides development engineers with a unique package that can reduce the product development cycle involved in vehicle, engine powertrain testing, by simulating the variability associated with particular driving styles and routes.

vDriver operates as a distance based sequencer, allowing users to reproduce specific routes and driving styles on their chassis, transient engine and powertrain dynamometers. users can either record routes, or select global pre-recorded routes provided within the package.The vDriver^TM package incorporates real-traffic and road-hazard conditions into the test-cell, allowing the user to simulate realistic operational conditions into the development cycle both quickly and repeatedly. The routes include a record of the road type, speed limits, traffic lights and other road-based events.
In this way the engine, power-train or vehicle may be robustly tested to realistic and varying driving conditions whilst in a laboratory environment, providing a user with the following benefits:
- Dramatically reduces development timescales due to the efficiency of reproducing a variety of operational circumstances in a controlled environment
- Verifiy the robustness of the Engine calibrations under “Real - World” driving conditions – minimising expensive recalls from unexpected combinations of circumstances
- Evaluate appropriate Hybrid Powertrain strategies under realistic operational demands (e.g. urban environments)
- Conduct integrated engine – powertrain- chassis system development and HIL testing
- Reproduce specific favourite or defined routes from any location in any of your test facilities
- Replicate your customers’ preferred test route in your facility without the expense and logistics of vehicle testing on location

Spesification

PC Specification
- GETAC V100 1.2 GHz Dual Core Industrial laptop
- Rotatable screen converts to a tablet PC for in vehicle use
- 12.1″ Widescreen Sunlight Readable Touch Screen
- Full Magnesium Alloy Case with Hand Strap
- IP54 and Shock protected fully ruggedized PC
- Supplied with AC and DC power adaptors for in vehicle use
GPS Specification
- Haicom model HI-204III USB GPS Receiver
- Utilises the Industry standard SiRF111 chipset
- GPS data output in NMEA format (industry Standard)
- Supports Bluetooth connection to a PC
- Uses all “in view” satellites for high accuracy, accurate to within 5 Metres with SBAS enabled

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The Hofmann Automatic Robot Driver system utilises advanced technology and design techniques to meet the high demand of endurance testing with the precision of control for exhaust emission and performance testing.
The Robot Driver system provides automated control capability for driving vehicles on a chassis dynamometer in a variety of test applications. The modular design and use of carbon fibre materials ensures the robot is installed in the test vehicle extremely quickly. With an automated learn routine all the vehicle’s driving controls are learnt quickly and effectively. The sophisticated automation system can be fully integrated with our chassis dynamometer control system or as a “Stand Alone” unit providing the user with many benefits including:

- Rapid installation (3 mins) and auto learn
- Accurate and repeatable control of the drive cycle
- Climatic (-40°C /+50°C) as standard
- Robot control system can also control a full chassis dynamometer providing cost effective upgrade solutions
- Comprehensive scheduler creation software (drag & drop) for easy creation of drivecyles from simple to complex including calculations and conditional logic capability
- Operate under vDriver control providing ”Real World” driving situations and operation

Applications include:

- Customer specific and regulatory vehicle testing
- Vehicle exhaust emission testing
- Vehicle mileage accumulation testing
- Climatic / Environmental vehicle testing
- NVH testing
- Powertrain testing

The Robot Driver can also be used to drive the vehicle in a variety of test applications including:

- Regulatory and development emission drive cycles
- Customer specific drive cycles
- Climatic (-40/+50°C) test applications
- NVH test applications
- Endurance/Mileage accumulation – fully integrated and automated test capability with airspeed fans, automatic fuel filling systems and data acquisition systems with safety and health monitoring
- General road simulation vehicle testing
Transmission testing

Spesification

- Measurement and control of individual gear engagement force
- Gear change speed control
- Auto-learn gear positions
- Multiple gear configuration for left and right-hand drive vehicles
- Accommodates automatic, sequential and electronic clutchless systems
- Synchro protection logic
- No load once gear is selected
- Seamless integration with chassis dynamometer system
- Accurate repeatability to fully confirm with Euro IV/V and US drive cycles

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Our range of extreme low noise N.V.H. Chassis Dynamometer systems have evolved and acquired techniques and capabilities previously only demanded in “high accuracy” emission test systems.
With continuous development of motor vehicles comes the demand for ever-improving product refinement. An increasingly significant area of this important work is passenger safety and comfort. The measurement and evaluation of vehicle noise, vibration, and harshness levels is subject to the variations in road and climatic conditions. By using a chassis dynamometer within a semi-anechoic chamber, the difficulty in monitoring these parameters under controlled conditions an be overcome.

Hofmann produce specialist chassis dynamometer designs which allow investigation of NVH levels whilst the vehicle is running under accurate and repeatable road load simulation, speed, force, or acceleration control.

Spesification

Speed Range	280 km/h
Absorption power per axle	278 kW
	(100 – 280 km/h)
Force per axle	10000 N
	(0 – 100 km/h)
Inertia simulation range	600 – 5400 kg
Wheelbase adjustment	2260 mm – 4700 mm
Roller diameter	1800 mm x 2 off
Width	610 mm
Spacing	1016 mm
Acoustic performance at 100 km/h	45 dBA (typical)

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Main Features:
- Automatic control for fully unattended testing
- Powerful schedule generator
- Meets US EPA and European cycle requirements
- Low maintenance, high accuracy, and efficiency
- Data acquisition and monitoring
- Host file server and networking facility

Hofmann have been involved in the supply of Mileage Accumulation Chassis Dynamometer test systems from the earliest requirements for the regulatory U.S.E.P.A. 50, 000 miles, exhaust system endurance testing. With the development of our product capability and the increasing demands for more sophisticated test requirements from our customers, this application has evolved into a fully flexible Automated Test solution. These systems now include a Chassis Dynamometer, an integrated Robot Driver, automated fuel filling units, comprehensive Data Acquisition, airspeed simulation fans, automated safety guards and security systems for unattended operation 24hrs a day / 7 days a week – collectively providing a highly effective, advanced endurance or rapid development test facility.
As the capability of the systems has increased, the Test Engineers have been able to produce more intricate simulations of real world situations under controlled conditions. What used to be called a “Mileage Accumulation Facility” now also provides a variety of dedicated and sophisticated tests for powertrain development. The traditional Mileage Accumulation Facility remains a semi-outdoor installation; however today you are as likely to find the Froude Hofmann automated systems installed in test chambers where the automation of the testing process is extremely beneficial.

The unique ability of Hofmann to engineer and integrate all the devices into one complete test automation system realises many features and benefits for the test engineer, including; reduced interfaces and controllers, fully integrated control and data acquisition, synchronisation of test cell sub systems (robot driver, automated fuel filling systems, airspeed simulation fan), automated drive cycle control and monitoring and effective integration of all the safety systems.
The core of the system is a comprehensive schedule generator function for creating, editing and executing the automated drive cycles. This utility in conjunction with the Robot Driver system; provides a highly capable “real world” or regulatory simulation package with human driving capability and fully automatic operation of all the vehicle function.

Standard mileage accumulation cycles are pre-programmed and special and/or complex cycles are easily generated using the schedule generator or road gathered data functions.

Spesification

Hofmann supply a range of Vehicle Test System products to the automotive and commercial vehicle markets which are specifically designed for testing passenger cars, light to heavy-duty trucks, motor cycles, buses, agricultural vehicles, and specific component subassemblies.
Applications are as varied as follows:
- Climatic test, simulating extreme hot and cold operating conditions
- Low noise (<45dBA)
- Gale force winds
- Prolonged high speed operation (>250 km/hour)
- Condensed vehicle life tests (>100,000 miles)

Various AC motor and roll configurations are available, either in-line, or centre mounted (M.I.M.). Inertia simulation ranges cover motorcycles to heavy-duty commercial vehicles.

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Engine Testing Indonesia

Brake Inertia Dynamometer

Transmission Testing

vDriver Simulation Software

Robot Driver

NVH Testing

Endurance Testing

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