Fuel pressure regulator

Internal-combustion engines – Charge forming device – Fuel flow regulation between the pump and the charge-forming...

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123512, 137506, F02M 3900

Patent

active

042352118

ABSTRACT:
A fuel pressure regulator for use in a fuel injection system for an internal combustion engine has a housing defining therein a fuel passage having upstream and downstream ends connected to a main fuel supply conduit and a fuel return pipeline, respectively. The fuel supply conduit is connected with fuel injectors at points upstream of the fuel pressure regulator. A first valve is provided in the fuel passage at a point downstream of a restriction also provided in the fuel passage. A fuel chamber is provided in the fuel passage between the restriction and the first valve. The first valve is opened when the fuel pressure in the fuel chamber exceeds a first predetermined pressure level to allow the fuel to flow from the fuel chamber to the return pipeline. A bypass fuel passage bypasses the restriction and has its downstream end connected to the fuel chamber. A second valve is provided in the bypass passage and is opened when the fuel pressure in the upstream end of the fuel passage exceeds a second predetermined pressure level higher than the first predetermined pressure level to allow the fuel to flow through the bypass passage.

REFERENCES:
patent: 2858842 (1958-11-01), Reis
patent: 3524465 (1970-08-01), Sadler
patent: 3946712 (1976-03-01), Hatz et al.
patent: 4111173 (1978-09-01), Skinner

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