TAILIEUCHUNG - The Motor Vehicle 2010 Part 5

Tham khảo tài liệu 'the motor vehicle 2010 part 5', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 304 The Motor Vehicle Fig. Left with rising fuel pressure due to increasing speed the piston is progressively moved to the right advancing the ignition. Right as speed and therefore fuel pressure fall the piston is moved to the left by its return spring regulated by the ECU and its function is to modify the basic or speed dependent timing in relation to engine load and temperature. Stanadyne rotary distributor pumps The forerunner of all the pumps of this type so far described was the invention sold in 1947 to the Hartford Division of Stanadyne by Vernon Roosa. Two features distinguished this invention one was the substitution of two opposed plungers for the then universal arrangement of one plunger for each engine cylinder the other was the use of inlet instead of spill metering. The latter feature meant that the unit was almost self-governing so that only a simple low cost governor was needed. By virtue of its compactness and simplicity this pump could be produced at a much lower cost than the in-line pumps. After 5 years of development the Roosa Master Model A pump with mechanical governing was put in production. In 1952 it was supplied to the Hercules Motors Corporation for fitting to the Oliver Cletrac tractors. Between 1955 and 1958 the Model B and D pumps were introduced and in 1958 the Model DB replaced the A and D units. In 1972 the DM with a heavier section rotor and four plungers was introduced. The DB2 a second generation DB pump was first produced in 1972. As can be seen from Figs and it is similar to the Lucas DP Series Section originally produced under licence from Stanadyne but the differences are of considerable interest. The two- and all-speed governors Sections and differ only in detail. On the two-speed version however provision is made for fuel temperature compensation. The rate of change of fuel flow per 10 C change in temperature is about by weight and by volume. Temperature compensation is especially

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