By Richard D. Atkins

This booklet offers the elemental rules required for the trying out and improvement of inner combustion engine powertrain structures, delivering the recent car engineer with the fundamental instruments required to successfully perform significant checks.

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Extra resources for An Introduction to Engine Testing and Development

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Spot coolers). Measuring of the air temperature can be done by situating the sensing thermocouple either in the inlet tract or in the free space near the opening to the tract, where it will record the ambient air temperature in the area where air is drawn into the engine inlet tract. Air Pressure Combustion or induction air pressure has a direct bearing on the performance of the internal combustion engine. The mass of the fuellair mixture charge within the inlet manifold ready to be drawn into the cylinder can be increased or decreased by a high or low air pressure, respectively.

The Hale-Hamilton coolant damper valve is incorporated into the raw water system on the inlet side before the water manifold. Its function is to smooth out the pump surges and to accumulate pressurized water in a pressure reservoir. This ensures that there is always a stable source of cooling water in a pressurized state for feeding to the dynamometer via the manifold in the test cell. Heat Exchangers The main function of heat exchangers is, as the name suggests, to exchange heat. It is important to remember that heat can be exchanged in both directions using the heat exchanger system.

Figure 2. I5 Dynamometer control readouts. (Courtesy of University of Sussex) The Key to Control Systems Proportional integral derivative (PID) control is the most common algorithm used in industry. As the name suggests, the PID algorithm consists of the three basic coefficients of proportional, integral, and derivative, which are varied to obtain the optimal response. PID is used as a means of continuous automatic monitoring and adjustment. The basic idea behind a PID controller is to read a sensor, then compute the desired actuator output by calculating proportional, integral, and derivative responses, and then sum those three components to compute the output.

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