TAILIEUCHUNG - The Motor Vehicle 2010 Part 8

Tham khảo tài liệu 'the motor vehicle 2010 part 8', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 514 The Motor Vehicle eight-cylinder engine the situation is more complicated because of the uneven firing intervals. However in the case of a V-8 with intervals between the passage of the spark in each bank of 0 180 270 and 450 and with valve open periods of 240 the problem can be overcome by installing two resonators and linking the inlet pipes of the central pair of cylinders in each bank across Resonator tube volume 1000 cm3 dia. cm b Rev min Resonator tube length L diameter cm Fig. Curves showing the effects of changes in geometry of the Helmholtz system depicted in Fig. a varying the diameter of the resonator tube P2 b its length and c the volume of the resonator Induction manifold design 515 to the resonator on the opposite side of the V as in Fig. b . In this way the inlet events can be equally spaced at 180 intervals although they do not coincide precisely with the corresponding 240 valve periods. The Helmholtz resonator in combination with tuned pipes A naturally aspirated application has been explored in detail by Shimamoto et al. in Vol. 30 No. 259 1987 of the JSME. A diagrammatic representation of the induction system used for this work is shown in Fig. . The effects of varying the geometry of the resonator are shown in Fig. which illustrates the calculated results obtained by these authors when applying the Helmholtz principle to a single-cylinder engine. Diagram a shows that increasing the diameter of the neck of the resonator causes the peak of the volumetric efficiency curve to approach the speed corresponding to the tuned frequency of the resonator. Progressively reducing it increases the resistance to flow in the neck and thus increases the time needed for energy accumulation in the resonator. Consequently as the engine speed is increased the phase of the resonant vibration lags causing it to become progressively less effective. Increasing the length of the neck diagram b has a similar effect. Since in .

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