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Архивы рубрики: An Introduction to Engine Testing and Development

Charge Air Cooling

The principal reason for turbocharging is to increase the power output of the engine without increasing the size of the engine. This is achieved by raising the inlet mani­fold pressure, thereby increasing the mass of fresh air drawn into the cylinders during the intake stroke and allowing more fuel to be burned. However, from the

Pulse Energy

Full advantage is taken of pulse energy. The principle advantage of the pulse over the constant pressure system is that the energy available for conversion to useful work in the turbine is greater. The measurement of exhaust manifold pulse waves relative to crankshaft angle are a prerequisite of turbocharger application and development. The advantages of

Turbochargers

Introduction The successful design of a turbocharged diesel engine is highly dependent on the choice of system for delivering exhaust gas energy from the exhaust ports to the turbine, as well as its consequential utilization in the turbine. Almost all the energy of the exhaust gas leaving the cylinder arrives at the turbine. A little

Determining the Effective Compression Ratio

This is a reasonable way to determine the effective compression ratio of your engine using measured cylinder pressure. It provides a means of determining the compres­sion characteristics of the engine while comprehending the intake valve closing point, heat loss, and mass losses. The effective compression ratio often will be lower than the measured geometric compression

Some Calculations Used in Conjunction with Combustion Analysis Work Combustion Efficiency

The results from the following equations can be used to establish the limit for the new heat release calculations added to the combustion analysis system (CAS). Use the com­bustion efficiency when the air/fiiel ratio is stoichiometric or lean. Use the oxidation efficiency when the air/fuel ratio is rich of stoichiometry. At stable operating condi­tions when

Recommended Daily Checks

Accurate chart keeping and the regular use of redundant measures require only a small investment in time to establish and maintain. However, they save many times the invest­ment by reducing development and test time through improved data quality. Spark ignition engine compression ratio optimization (using in-cylinder pressure mea­surement as your tool) is a most useful

Good Test Practices

Make redundant measures a part of your testing. Typically, any one measurement can be supported by several devices or other measurements, an example being air/fuel ratio. Take the time to understand and apply redundant measures wherever possible. The fol­lowing are some redundant measures: • How many ways can you quantify and qualify the measured air/fuel

Control Charts

A control chart is a statistical tool used to distinguish naturally occurring variation in a process from variation due to special causes (Figure 8.81). Naturally occurring varia­tion is inherent to any process over time and affects all outcomes. Special causes, or assignable causes, such as a failing pressure transducer or an air leak in an

Data Integrity

How is data integrity achieved? It is achieved by understanding the magnitude and causes of variation present in the combustion data acquisition process and then using that knowledge to identify and remove causes that do not occur naturally. Daily checks will provide the information necessary to understand sources of variability. Daily checks should be performed

Encoders

Encoders are useful for crankshaft position sensing, as follows: • With an optical encoder, a light gate and optical pickup indicate the crankshaft position. • Digital magnetic pickup (DI-MAG), 0-5-volt TTL output is dependent on the magnetic field strength and can be used for sensing ring gear teeth. • With a magnetic encoder, the sine