Fuel supply apparatus for internal combustion engine
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsMamoru Tomatsuri, Yukio Kobayashi, Keita Fukui
Life of this patent
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Abstract
The engine ECU executes a program including the step of determining whether there is a possibility of occurrence of air bubbles within the high-pressure delivery pipe when there is an engine start request, the step of transmitting an open-instruction signal to the electromagnetic relief valve when there is a possibility of occurrence of air bubbles, the step of transmitting a drive-instruction signal to the feed pump, the step of transmitting a close-instruction signal to the electromagnetic relief valve after the feed pump is driven for a predetermined period of time, the step of transmitting a drive-instruction signal to the starter, and the step of transmitting an injection-instruction signal to the EDU.
Claims20
A fuel supply apparatus for an internal combustion engine having a fuel injection mechanism, comprising:
- a high-pressure fuel pump driven by said internal combustion engine and for pressurizing fuel supplied from a fuel tank by a low-pressure fuel pump;
- a delivery pipe for supplying the fuel from said high-pressure fuel pump to said fuel injection mechanism;
- a relief valve that is directly attached to an egress of said delivery pipe and is switched between a communicating state where said delivery pipe is communicated with said fuel tank and a non-communicating state where said delivery pipe is not communicated with said fuel tank;
- and
- a control portion for controlling said relief valve;
- wherein said control portion
- switches said relief valve to said communicating state at a time of stop of said internal combustion engine, and
- switches said relief valve to said communicating state and drives a fuel pump before fuel injection by said fuel injection mechanism when a predetermined condition for a state in said delivery pipe is satisfied.
A fuel supply apparatus for an internal combustion engine having fuel injection means, comprising:
- a high-pressure fuel pump driven by said internal combustion engine and for pressurizing fuel supplied from a fuel tank by a low-pressure fuel pump;
- a delivery pipe for supplying the fuel from said high-pressure fuel pump to said fuel injection means;
- a relief valve that is directly attached to an egress of said delivery pipe and is switched between a communicating state where said delivery pipe is communicated with said fuel tank and a non-communicating state where said delivery pipe is not communicated with said fuel tank;
- and
- control means for controlling said relief valve;
- wherein said control means includes
- means for switching said relief valve to said communicating state at a time of stop of said internal combustion engine, and
- pump control means for switching said relief valve to said communicating state and driving a fuel pump before fuel injection by said fuel injection means when a predetermined condition for a state in said delivery pipe is satisfied.
Dependencies are inferred from the claim text.