| 摘要 |
A high-pressure fuel pump for an internal combustion engine with direct injection of fuel into at least one combustion chamber of the internal combustion engine is provided. The high-pressure fuel pump includes a low-pressure connection for low-pressure fuel, wherein the low-pressure connection supplies low-pressure fuel to the high-pressure fuel pump, a low-pressure fuel supply chamber, a pump element and a high-pressure connection for discharging fuel from the high-pressure fuel pump. The low-pressure connection, the low-pressure fuel supply chamber, the pump element, and the high-pressure connection are provided in succession in a flow direction of the fuel. A medium-pressure fuel connection opens into a medium-pressure fuel supply chamber for supplying medium-pressure fuel to the high-pressure fuel pump. A fuel switching valve selectively connects the low-pressure fuel supply chamber or the medium-pressure fuel supply chamber in a fluid-conducting manner to the pump element. |
| 主权项 |
1. In an internal combustion engine with at least one combustion chamber and direct injection of fuel into the at least one combustion chamber, a high-pressure fuel pump comprising:
a low-pressure connection for low-pressure fuel, said low-pressure connection being configured to supply low-pressure fuel to the high-pressure fuel pump; a low-pressure fuel supply chamber; a pump element; a high-pressure connection for discharging fuel from the high-pressure fuel pump; a medium-pressure fuel supply chamber; a medium-pressure fuel connection for supplying medium-pressure fuel to the high-pressure fuel pump, said medium-pressure fuel connection opening into said medium-pressure fuel supply chamber; a fuel switching valve disposed downstream of said low-pressure fuel supply chamber, said fuel switching valve selectively connecting one of said low-pressure fuel supply chamber and said medium-pressure fuel supply chamber in a fluid-conducting manner to said pump element; said low-pressure connection, said low-pressure fuel supply chamber, said fuel switching valve, said pump element, and said high-pressure connection being provided in succession in a fuel flow direction; a pump housing with a cover; said low-pressure fuel supply chamber, said medium-pressure fuel supply chamber, said pump element, and said fuel switching valve being disposed in said pump housing; and said low-pressure fuel supply chamber, said medium-pressure fuel supply chamber, said pump element, said fuel switching valve, said low-pressure connection, said high-pressure connection, and said medium-pressure fuel connection together forming a unified device. |
