Compound electromagnetic valve, high pressure pump and apparatus for controlling high pressure pump

A high pressure pump comprising:

• a high pressure chamber;
• a passage for supplying fluid to the high pressure chamber;
• and
• an electromagnetic control valve for controlling the amount of fluid that enters the high pressure chamber through the passage, the electromagnetic control valve comprising:
• an electromagnetic actuator for generating an electromagnetic force;
• a main valve body for opening and closing the passage in accordance with the electromagnetic force generated by the electromagnetic actuator;
• a bypass formed in the main valve body, wherein the bypass connects an upstream part of the main valve body to a downstream part of the main valve body;
• and
• a sub valve body for opening and closing the bypass in accordance with the electromagnetic force generated by the electromagnetic actuator, wherein the electromagnetic force generated by the electromagnetic actuator is adjusted such that the sub valve body is opened and closed while the main valve body closes the passage.

A high pressure pump used for supplying fuel to an internal combustion engine, the high pressure pump comprising:

• a high pressure chamber;
• a passage for supplying fuel to the high pressure chamber;
• an electromagnetic control valve for controlling the amount of fuel that enters the high pressure chamber through the passage, the electromagnetic control valve comprising:
• an electromagnetic actuator for generating an electromagnetic force;
• a main valve body for opening and closing the passage in accordance with the electromagnetic force generated by the electromagnetic actuator;
• a bypass formed in the main valve body, wherein the bypass connects an upstream part of the main valve body to a downstream part of the main valve body;
• and
• a sub valve body for opening and closing the bypass in accordance with the electromagnetic force generated by the electromagnetic actuator;
• and
• a controller for controlling the electromagnetic control valve to adjust the flow rate of fuel in accordance with the flow rate of fuel required by the engine, wherein, when the flow rate of fuel required by the engine is less than a predetermined value, the controller controls the electromagnetic force such that the sub valve body is opened and closed while the main valve body closes the passage.