公开(公告)号：US20150233289A1

公开(公告)日：2015-08-20

申请号：US14700494

申请日：2015-04-30

Applicant: Tula Technology, Inc.

Inventor： Matthew A. YOUNKINS ,  Shikui Kevin CHEN ,  Li-Chun CHIEN ,  Masaki NAGASHIMA ,  John W. PARSELS ,  Geoff ROUTLEDGE

IPC: F02B77/08 ,  G01P15/00 ,  G01L3/00 ,  G01M15/04

CPC classification number: F02B77/082 ,  F02D13/06 ,  F02D35/023 ,  F02D41/0087 ,  F02D41/1498 ,  F02D41/22 ,  F02D2041/001 ,  G01L3/00 ,  G01M15/042 ,  G01P15/00 ,  Y02T10/18 ,  Y02T10/40

Abstract: Methods and systems are described for detecting valve actuation faults in internal combustion engines operating in a skip fire operational mode. In one aspect, a torque model is used to estimate an expected net torque during a selected operating window. The torque model considers an expected torque contribution from each of the cylinders and accounts for the effects of specific skip fire firing decisions that affect the expected torque contribution from each cylinder. A parameter indicative of the actual engine torque is also measured. Valve actuation faults can then be identified based at least in part on a comparison of the measured parameter to an expected parameter value that is based at least in part on the expected net torque. With the described approaches, the occurrence of the valve actuation fault can be made within one engine cycle of the initial occurrence of the fault.

Abstract translation: 描述了用于检测以跳火操作模式操作的内燃机中的阀致动故障的方法和系统。 在一个方面，使用扭矩模型来估计所选操作窗口期间的预期净转矩。 扭矩模型考虑了每个气缸的预期扭矩贡献，并考虑了影响每个气缸的预期转矩贡献的特定跳火点火决定的影响。 还测量了表示实际发动机扭矩的参数。 至少部分地基于测量参数与至少部分地基于预期净转矩的预期参数值的比较来识别阀致动故障。 利用所述方法，可以在故障的初始发生的一个发动机循环内进行气门致动故障的发生。