Fuel supply system for internal combustion engine, comprises low pressure pump conveying fuel to high pressure pump which has electrically controlled valve with modified travel to reduce noise

摘要

A low pressure pump conveys fuel to the working chamber (33) of a high pressure pump (30) through a filter (18) and the high pressure pump supplies a common ramp (38). Fuel supply to the high pressure pump working chamber is controlled by an electric valve (60) which receives electrical impulses to slow the valve speeds at the ends of the valve travel particularly at low engine speeds as detected by a regulation and control unit (48). An Independent claim is also included for a fuel supply system that uses slower valve speeds at valve travel limits to reduce noise