Engine test stand

An engine test stand is a facility used to develop, characterize and test engines. The facility, often offered as a product to automotive OEMs, allows engine operation in different operating regimes and offers measurement of several physical variables associated with the engine operation.

A sophisticated engine test stand houses several sensors (or transducers), data acquisition features and actuators to control the engine state. The sensors would measure several physical variables of interest which typically include:
* crankshaft torque
* angular velocity of crankshaft
* intake air and fuel consumption rates, often detected using volumetric and/or gravimetric measurement methods
* air-fuel ratio for the intake mixture, often detected using an exhaust gas oxygen sensor
* environment pollutant concentrations in the exhaust gas such as carbon monoxide, different configurations of hydrocarbons and nitrogen oxides, sulfur dioxide, and particulate matter
* temperatures and gas pressures at several locations on the engine body such as engine oil temperature, spark plug temperature, exhaust gas temperature, intake manifold pressure
* atmospheric conditions such as temperature, pressure, humidity

Information gathered through the sensors is often processed and logged through data acquisition systems. Actuators allow for attaining a desired engine state (often characterized as a unique combination of engine torque and speed). For gasoline engines, the actuators may include an intake throttle actuator, a loading device for the engine such as an induction motor. The engine test stands are often custom-packaged considering requirements of the OEM customer. They often include a microcontroller based feedback control system with following features:
* closed-loop desired speed operation (useful towards characterization of steady-state or transient engine performance)
* closed-loop desired torque operation (useful towards emulation of in-vehicle, on-road scenarios, thereby enabling an alternate way of characterization of steady-state or transient engine performance)

Engine test stand applications

* Research and Development of engines, typically at an OEM laboratory
* Tuning of in-use engines, typically at service centers or for racing applications
* End of production line at an OEM factory

Engine testing for R&D

Research and Development activities on engines at automobile OEMs have necessitated sophisticated engine test stands. Automobile OEMs are usually interested in developing engines that meet the following three-fold objectives:
* to provide high fuel efficiency
* to improve drivability and durability
* to be in compliance to relevant emission legislationConsequently, an R&D engine test stands allow for a full-fledged engine development exercise through measurement, control and record of several relevant engine variables.

Typical tests include ones that:
* determine fuel efficiency and drivability: torque-speed performance test under steady-state and transient conditions
* determine durability: aging tests, oil and lubrication tests
* determine compliance to relevant emission legislations: volumetric and mass emission tests over stated emission test cycles
* gain further knowledge about the engine itself: engine mapping exercise or development of multidimensional input-output maps among different engine variables. e.g. a map from intake manifold pressure and engine speed to intake air flow rate.

ee also

* Air flow meter
* Driveshaft
* Dynamometer
* Emission standard
* Emission test cycle
* Engine cart
* Electromagnetic brake Article about eddy current dynos


Wikimedia Foundation. 2010.

Look at other dictionaries:

  • test stand — A stationary structure where engines, components, etc., may be mounted for testing. Engine test stand …   Aviation dictionary

  • test stand — Rocketry. a device that restrains a missile or rocket during a captive test. [1840 50] * * * test stand, a device to hold something that is being tested, such as a rocket engine …   Useful english dictionary

  • Rocket engine test facility — A rocket engine test facility is a location where rocket engines may be tested on the ground, under controlled conditions. A ground test program is generally required before the engine is certified for flight. Ground testing is very inexpensive… …   Wikipedia

  • Rocket Engine Test Facility — Infobox nrhp name =Rocket Engine Test Facility nrhp type = nhl caption = 1982 photograph location= Lewis Research Center, Cleveland, Ohio locmapin = Ohio area = built =1957 architect= National Advisory Committee for Aeronautics (NACA)… …   Wikipedia

  • Engine cart — An engine cart is an engine support on rollers used at an engine test stand.The engine, e.g. combustion engine, is mounted on this mobile support for holding the engine in an accurate position during the test.Compared to a fixed support, the… …   Wikipedia

  • Engine — This article is about a machine to convert energy into useful mechanical motion. For other uses of engine, see Engine (disambiguation). For other uses of motor, see Motor (disambiguation). A V6 internal combustion engine from a Mercedes car An… …   Wikipedia

  • test club — A wide blade, short diameter propeller used for applying a specific load to an engine on a test stand for its initial run in …   Aviation dictionary

  • test — {{Roman}}I.{{/Roman}} noun 1 examination of sb s knowledge/ability ADJECTIVE ▪ demanding, difficult, gruelling/grueling ▪ easy, simple ▪ fair, good …   Collocations dictionary

  • Engine Alliance GP7200 — Basisdaten (GP7270) Durchmesser 316 cm Fandurchmesser 296 cm Masse 6712 kg Länge 474 cm …   Deutsch Wikipedia

  • Test Flight and Development Centre SAAF — The Test Flight and Development Centre is a unit of the South African Air Force. It is currently a test flight and evaluation centre.HistoryDue to South Africa s apartheid policies of the time, a number of countries instituted an arms boycott… …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”

We are using cookies for the best presentation of our site. Continuing to use this site, you agree with this.