公开(公告)号：US20150369160A1

公开(公告)日：2015-12-24

申请号：US14838368

申请日：2015-08-28

Applicant: Caterpillar Inc.

Inventor： Derek A. Tanis ,  Christopher J. Hurley ,  Derek E. Nieman ,  Ramamurthy Vaidyanathan

IPC: F02D41/30 ,  F02M57/02 ,  F02M63/00 ,  F02M61/04

CPC classification number: F02M63/0015 ,  F02M57/024 ,  F02M61/04

Abstract: A method to control an injection pressure level of fuel within a unit injector is provided. The method includes provision of a second spill valve in the unit injector, which is connected in parallel to a first spill valve. The fuel is delivered to the unit injector with the first spill valve maintained in a passive state. This facilitates return of the first portion of the fuel to the low-pressure fuel manifold. The first spill valve is actuated to an active state to block the flow of fuel to the low-pressure fuel manifold, to maintain the unit injector at the injection pressure level. The second spill valve is actuated concurrently or prior to the actuation of the first spill valve. This facilitates return of a second portion of the fuel to the low-pressure fuel manifold. This is done to limit the injection pressure level within the unit injector.

Abstract translation: 提供了一种用于控制单元喷射器内的燃料的喷射压力水平的方法。 该方法包括在单元喷射器中设置并联连接到第一溢流阀的第二溢流阀。 第一个溢流阀保持处于被动状态，将燃料输送到单元喷射器。 这有助于将燃料的第一部分返回到低压燃料歧管。 第一溢流阀被致动到活动状态以阻止燃料流向低压燃料歧管，以将单元喷射器保持在喷射压力水平。 第二溢流阀同时或在第一溢流阀致动之前被致动。 这有助于燃料的第二部分返回到低压燃料歧管。 这是为了限制单元注射器内的注射压力水平。