Methods and systems are provided for diagnosing a positive crankcase ventilation (PCV) system. In one example, a diagnostic method for a PCV system is provided that includes, when an intake manifold air pressure is above a threshold boost value, determining a PCV system breach based on a pressure determined using a pressure sensor positioned on a clean side of an oil separator coupled to a crankcase and receiving crankcase gas from the crankcase. In the PCV system a ventilation line provides fluidic communication between the oil separator and an intake conduit upstream of a compressor.

A method for operating an internal combustion engine having an injection system having a high-pressure accumulator, wherein an instantaneous high pressure in the high-pressure accumulator is monitored in a time-dependent manner by a high-pressure sensor. A first alarm stage is set, if a) a first predetermined high-pressure limit value is exceeded without interruption by the instantaneous high pressure for a predetermined limit time period, and/or b) if the first predetermined high pressure limit value is exceeded for the first time at a predetermined, first limit frequency by the instantaneous high pressure.

A heater is provided that includes at least one resistive heating element having a material with a non-monotonic resistivity vs. temperature profile and exhibiting a negative dR/dT characteristic over a predetermined operating temperature range along the profile. The heater can include a plurality of circuits disposed in a fluid path to heat fluid flow.

A control device for an internal combustion engine is disclosed. The internal combustion engine includes a plurality of cylinders, a fuel injection valve configured to supply fuel to each cylinder, an EGR passage configured to connect an exhaust passage and an intake passage, an EGR valve configured to adjust a flow rate of exhaust gas flowing from the exhaust passage into the intake passage through the EGR passage, and an air-fuel ratio sensor provided in the exhaust passage. The control device includes an electronic control unit configured to execute determination processing for determining that a degree of imbalance abnormality is greater when a fluctuation amount of a detection value of the air-fuel ratio sensor is relatively large than when the fluctuation amount is relatively small.

A heater system for an exhaust system is provided. The heater system includes a heater disposed in an exhaust conduit. The heater includes a plurality of heating elements disposed in the exhaust conduit. A heating control module controls the plurality of heating elements differently according to operating conditions specific to each heating element. In other forms, the heater system for an exhaust system has a plurality of heating zones, instead of a plurality of heating elements. The heating control module controls the plurality of heating zones differently according to operating conditions specific to each heating zone.

A method for performing condition-based maintenance of an engine is presented. The method includes obtaining one or more parameters corresponding to the engine. Also, the method includes determining a temperature profile corresponding to a portion of a fluid flow component based on a first parameter and one or more thermal models. The method further includes estimating a solid deposit in the portion of the fluid flow component corresponding to each cycle of the engine based on the temperature profile and deposition kinetics parameters. Further, the method includes predicting a total solid deposit in the portion of the fluid flow component based on the estimated solid deposit corresponding to each cycle of the engine. Moreover, the method includes performing the condition-based maintenance of the engine based on a value of the predicted total solid deposit.

A misfire detection device for an internal combustion engine is provided. A mapping takes time series data of instantaneous speed parameters as inputs. Each instantaneous speed parameter corresponds to one of a plurality of successive second intervals in a first interval. The instantaneous speed parameters correspond to the rotational speed of the crankshaft. The first interval is a rotational angular interval of the crankshaft in which compression top dead center occurs. The second interval is smaller than an interval between compression top dead center positions. The mapping outputs a probability that a misfire has occurred in at least one cylinder that reaches compression top dead center in the first interval. The mapping data defining the mapping has been learned by machine learning.

A system for tracking oil health of an engine includes an electronic fuel injection system which includes an electronic governor control unit. The electronic governor control unit is programmed to track engine parameters, calculate oil health based on the tracked engine parameters and on engine type, and display an indication of oil health.

A control system for use in a fluid flow application is provided. The control system includes a heater having at least one resistive heating element. The heater is adapted to heat the fluid flow. The control system further includes a control device that uses heat loss from at least one resistive heating element to determine flow characteristics of the fluid flow.

An engine maintenance set can be generated via a computerized system using engine status data for an internal combustion engine. The generating can include operating on the engine status data using a set of computer-readable maintenance set generation rules, with the rules correlating an engine maintenance set with a triggering condition. The generating can include determining that the triggering condition is met, with the triggering condition including each of one or more triggering parameters being within one or more corresponding triggering value ranges. The triggering parameters can include at least one engine emission triggering parameter. The generating can further include producing the engine maintenance set using the maintenance set generation rules. The generated engine maintenance set can be issued, with the engine maintenance set including one or more commands to perform one or more maintenance operations to improve efficiency of the engine and/or one or more engine status notifications.