By Michael Paulweber, Klaus Lebert
The ebook bargains with the more and more complicated try structures for powertrain elements and platforms giving an outline of the various sorts of try out beds for all elements of a complicated powertrain concentrating on particular issues reminiscent of instrumentation, keep watch over, simulation, hardware-in-the-loop, automation or try out facility administration. This booklet is meant for powertrain (component) improvement engineers, try mattress planners, try out mattress operators and beginners.
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Extra info for Powertrain Instrumentation and Test Systems: Development – Hybridization – Electrification
It is also possible to expose paired turbocharger assemblies alternately to hot and cold temperatures (via switching facilities), a method which not only raises the test bed service life (steady-state burner operating point) but also subjects the unit under test to maximum temperature gradients (smallest thermal inertias used because the burner is not involved in the temperature change). In addition, this increases the statistical lot size per test (2–8 turbochargers in the same test). – Fatigue cycles: conducted to test component stability in transient load changes (speed variations).
4). Several types of component test beds are discussed in further detail below. 1 Test Beds for Oil-Circuit Components Setup The key components in a motor vehicle’s oil circuit are (see Fig. 24): – Lube oil pump (pressure pump) – Suction pump (in the case of dry sump lubrication) – Oil filter For testing such components, a test bed setup is needed that: – provides the test medium (engine oil) with adjustable parameters (pressure, volume flow and temperature) – provides an air separation system in the oil reservoir – regulates back pressure (in the unit under test’s oil return line) – measures oil temperature, mass flow and density (also in the return line, wherever applicable) – controls the speed of the drive system connected to the test components and measures at least speed and torque Fig.
For supplying the test medium with the appropriate parameters (oil/air ratio) and the required consistency (oil foam), suitable additional systems must be provided. – Filter characteristics based on the parameters temperature, flow rate (including oil density, if required) – Flow tests on the engine block or cylinder head, or on various other components – Durability tests System Dimensioning The system’s cooling power must at least cover the power of the installed drive system connected to the unit-under-test component.