Pilot injection fuel injection pump
阅读：890发布：2021-10-06
专利汇可以提供Pilot injection fuel injection pump专利检索，专利查询，专利分析的服务。并且A timed pulsed fuel injection device which meters fuel continuously and distributes flow pulses to n nozzles through a rotary distributor pressure cascading device which totally isolates the metering event from variations and dynamic effects in the n injection lines can be built to inject a small pilot pulse prior to the main injection pulse of fuel. Because the small pilot charge can ignite quietly prior to injection of the main charge eliminating the ignition lag of the main charge, pilot injection eliminates diesel noise and knock and permits complete control of combustion phasing in a diesel engine.，下面是Pilot injection fuel injection pump专利的具体信息内容。
1. A timed, pulsed fuel injection system including a main injection system and a pilot injection system which injects fuel pulses through n nozzles in a repeating sequence where the main injection system comprises: a. n + 2 accumulator chambers (1), (2), (31), (32), (33), (3n); b. means to meter pressurized fuel flow continuously to accumulator chamber (1); c. n nozzles (1), (2), (3), . . . , n where nozzle i is in continuous fluid connection with the corresponding accumulator chamber 3i (i 1, 2, ..., n); d. first switching means to open and close fluid flow between the accumulator chambers (1) and (2) and a second switching means to open and close flow between accumulator chamber (2) in succession to accumulator chambers (31), (32), (33), ..., (3n); where said first and second switching means open and close fluid contact between the accumulator chambers in the sequence 1-2, 2-31, 1-2, 2-32, 1-2, 2-33, ..., 1-2, 2-3n, 1-2, 2-31, 1-2, . . .; and wherein the pilot injection system comprises: e. pilot accumulator chambers (4) and (5); f. means to meter pressurized fuel flow continuously to pilot accumulator chamber (4); g. third switching means to open and close fluid flow between the pilot accumulator chambers (4) and (5) and a fourth switching means to open and close flow between pilot accumulator chamber (5) in succession to accumulator chambers (31), (32), (33), . . . , (3n) which are held in common by the main and pilot injection systems where said third and fourth switching means open and close fluid contact between the accumulator chambers in the sequence 4-5, 5-31, 4-5, 5-32, 4-5, 5-33, . . . , 4-5, 5-3n, 4-5, 5-31, 4-5, . . .; h. where each accumulator chamber i (1), (2), (3i), (4), (5,) has a volume versus pressure function vi (pi) such that dvi/dpi 0 if pressure pi in the chamber i is less than a set pressure pai, where dvi/dpi is large if pi>pai, and where the accumulator pressures pai for each chamber are related so that pa1>pa2>pa31 or pa32 or pa33 or ... or pa3n and so that pa4>pa5>pa31 or pa32 or . . . or pa3n.
2. The invention as stated in claim 1, and including line repressurizing means to fill any fluid cavities in any of the n injection lines between discharge of the main injection pulse through said line and the timing of the next pilot injection pulse into said line.
3. The invention as stated in claim 1, and wherein said means to meter pressurized fuel flow continuously to pilot accumulator chamber (4) is adapted to meter a flow of fuel sufficient to fill any cavities in the line i and to pressurize the line i to the opening pressure of the nozzle i for each fuel pulse delivered from pilot chamber (5) to said line i.
4. The invention as set forth in claim 1 and wherein said third and fourth switching means are in the form of a rotary distributor opening and closing fluid contact between the accumulators (4-5) and (3i) (i-1-a) in the sequence 4-5, 5-31, 4-5, 5-32, 4-5, 5-33 . . . , 4-5, 5-3n, 4-5, 5-31, 4-5, . . . .
5. A timed, pulsed fuel injection system including a main injection system and a pilot injection system which injects fuel pulses through n lines L1, L2 ..., Ln connected to n nozzles in a repeating sequence comprising: means to inject main injection pulses through each of said n lines; and wherein the pilot injection system comprises: a. pilot accumulator chambers (4) and (5); b. means to meter pressurized fuel flow continuously to pilot accumulator chamber (4); c. third switching means to open and close fluid flow between the pilot accumulator chambers (4) and (5) and a fourth switching means to open and close flow between pilot accumulator chamber (5) in succession to lines L1, L2, ...Ln, where said third and fourth switching means open and close fluid contact between the chambers and lines in the sequence 45, 5-L1, 4-5, 5-L2, ...4-5, 5-Ln; d. where accumulator chambers (4) and (5) have a volume versus pressure function Vi (Pi) such that dvi/dpi 0 if pressure pi in chamber i is less than a set pressure pai, where dvi/dpi is large if pi>pai and where accumulator pressures pai are related so that Pa4>Pa5 and where pa5 is greater than the opening pressure of any of the n nozzles; and e. wherein said main injection system and said pilot injection system are timed so that chamber (5) is not in contact with a line Li when the main injection system is injecting fuel into said line Li.
6. The invention as stated in claim 5, and including line repressurizing means to fill any fluid cavities in any of the n injection lines between discharge of the main injection pulse through said line and the timing of the next pilot injection pulse into said line.
7. The invention as stated in claim 5, and wherein the means to meter pressurized fuel to chamber (4) is adapted to compensate for the cavitation producing effects in said lines L1. . . Ln, whereby said metering means meters a fuel flow sufficient to fill the cavities of a line Li and to pressurize said line Li to the opening pressure of the nozzle i under cavitation conditions.
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