(57) ABSTRACT A rotating machine valve health monitor. Aspects of the valve monitor
include instrumenting each valve of a recip rocating compressor, or other rotating machine …

A variety of methods and arrangements for reducing noise, vibration and harshness (NVH)
in a skip fire engine control system are described. In one aspect, a firing sequence is used to …

Methods, devices, estimators, controllers and algorithms are described for estimating the
torque profile of an engine and/or for controlling torque applied to a powertrain by one or …

Methods and arrangements are described for controlling transitions between firing fractions
during skip fire operation of an engine in order to help smooth the transitions. Generally …

Primary Examiner-Thomas Moulis (74) Attorney, Agent, or Firm—Beyer Law Group LLP (57)
ABSTRACT Methods, devices, estimators, controllers and algorithms are described for …

Methods and systems are described for detecting valve actuation faults in internal
combustion engines operating in a skip fire operational mode. In one aspect, for each skip …

(57) ABSTRACT A variety of methods and arrangements for detecting misfire and other
engine-related errors are described. In one aspect, a window is assigned to a target firing …

(57) ABSTRACT A variety of methods and arrangements for reducing noise, vibration and
harshness (NVH) in a skip fire engine control system are described. In one aspect, a firing …

BACKGROUND Fuel efficiency of internal combustion engines can be Substantially
improved by varying the displacement of the engine. This allows for the full torque to be …

A variety of methods and arrangements for detecting failure of the commanded air induction
in an internal combustion engine are described. In some embodiments, the intake manifold …