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(11) | EP 1 304 470 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | Fuel pressure control apparatus |
| (57) The present invention proposes a fuel pressure control apparatus for a high-pressure
fuel injection system which sufficiently reduces a fuel pressure in an accumulator
line (20) while preventing the high-pressure fuel injection system from being adversely
affected. The fuel pressure control apparatus for the high-pressure fuel injection
system is equipped with an accumulator line (20) for accumulating fuel supplied from
a fuel pump (30) at a high pressure and supplying the fuel to fuel injection valves
(12), and with a relief valve (22) for discharging fuel in the accumulator line (20).
Furthermore, the apparatus is equipped with fuel pressure control means (68) for detecting
a fuel pressure in the accumulator line (20) and driving the relief valve (22) so
as to reduce the fuel pressure in accordance with a pressure reduction requirement
based on a comparison between the detected fuel pressure and a target pressure. A
relief valve driving control means (60) controls the relief valve (22) in such a manner
as to prevent the open-valve period of the relief valve from overlapping with a timing
at which a fuel pressure detection means (68) detects a fuel pressure. |