The disclosure describes systems and methods of detecting a misfire in a cylinder of an engine. Such systems and methods may include determining a standard deviation for a crank angle location in a chamber of the engine, determining a standard deviation of the peak pressure in a chamber of the engine. If the standard deviation for a crank angle location is greater than a threshold value for the standard deviation for a crank angle, or if the standard deviation for the peak pressure is greater than a threshold value for the standard deviation of the peak pressure, an engine cylinder cut out check may be performed to identify one or more misfiring cylinders.

Regarding a work vehicle that includes an engine mounted on a travelling machine body and an exhaust gas purification device arranged in an exhaust gas path of the engine, it is an object to prevent the regeneration control of the exhaust gas purification device from being executed against operators' will. The work vehicle of the present invention includes a regeneration switch 329 for executing the regeneration control of an exhaust gas purification device 50, a meter panel 246 for displaying the situation of driving operations of a travelling machine body 2, and a work device 15. Then, when it is assumed that a predetermined amount or more of particulate matter in the exhaust gas purification device 50 is accumulated, the meter panel 246 notifies a regeneration control request warning and displays characters that urge stoppages of work of the work device 15 and travelling of the travelling machine body 2.

A method for diagnosing a lack of engine oil includes determining, by a controller, whether an oil level of an engine is normalized from an insufficient state to a normal state using an oil level switch. When it is determined that the oil level is normalized to the normal state, a driving mode of a vehicle is confirmed. When it is confirmed that the driving mode of the vehicle is an engine off driving mode, a diagnosis of the oil level is stopped.

A method of controlling a concentration of hydrocarbons in exhaust gas from an internal combustion engine includes sensing an oxygen percentage of the flow of exhaust gas from the internal combustion engine and determining a concentration of hydrocarbons in the flow of exhaust gas. An engine control module may then adjust the sensed oxygen percentage of the exhaust gas based on the determined concentration of hydrocarbons in the flow of exhaust gas to define a corrected oxygen percentage. The control module may then control at least one of a hydrocarbon injection rate for in-cylinder combustion of the internal combustion engine, and a hydrocarbon injection rate for a post combustion exhaust gas treatment process, based on the corrected oxygen percentage, to control the concentration of hydrocarbons in the exhaust gas.

A method for diagnosing a no-start fault of a vehicle push-button start system including a push-button switch, where the system starts a vehicle engine if the switch is pressed and a vehicle brake is applied. The method includes detecting that a no engine crank condition has occurred if the switch is pressed and the brake is applied, and if so, performs a no crank diagnosis. The method also includes determining that a starter control relay has not been enabled after the system is in a crank power mode, and if so, performs a starter not-enabled diagnosis. The method also includes determining that the starter control relay has been disabled before the engine is running, and if so, performs a start disable diagnosis. The method also includes determining that the engine has stalled within some minimum time after it has successfully been started, and if so, performs an engine stall diagnosis.

A method for monitoring/controlling starting of a heat engine of a hybrid vehicle including at least one electrical engine, including: launching a simulated sequence for starting the heat engine by using a start battery; measuring and recording progress over time of at least one parameter of the start battery, including a given current strength and voltage at terminals of the start battery; and detecting whether or not the progress over time of the at least one parameter reaches a predetermined value defining a state of the start battery, with or without a required capacity, for starting the heat engine during a predetermined time interval.

A positive crankcase ventilation (PCV) system for an engine includes: a PCV tube defining a flowpath extending along an axis; a damage detection circuit associated with the PCV tube. The PCV system also includes a damage detection module that selectively indicates that a fault is present in the PCV tube based on a change in a characteristic of the damage detection circuit and that illuminates a malfunction indicator lamp (MIL) when the fault is present.

A user interface apparatus for controlling a vehicle comprising a non-uniform displacement engine comprising at least two sizes of cylinders having different displacements, a motor connected to a driving shaft of the engine, and a motor controller for controlling the motor, the user interface apparatus includes an input for selecting a control mode of the non-uniform displacement engine and the motor, an interface controller communicating with the motor controller such that the motor is controlled in the selected control mode, and a display device for displaying information about the selected control mode, wherein the user interface apparatus has a control mode for controlling the motor to compensate for a difference in torque due to different displacements of the cylinders such that a sum of engine torque and motor torque in explosion stroke of each cylinder is uniform.

Various systems and methods are described for deactivation and reactivation of a cylinder bank in a V-engine. In one example, the cylinder bank is deactivated responsive to an indication of misfire based on crankshaft acceleration and exhaust air fuel ratio. The cylinder bank is reactivated sequentially based on exhaust catalyst temperature.

A control system for a small engine operated device includes an emitter carried by the engine or a portion of the device spaced from the engine and a control circuit. The control circuit may include memory with which control data related to device conditions, engine conditions or both is stored, and a processor in electrical communication with the first emitter. The control circuit provides a signal corresponding to the control data to the emitter so that the emitter provides an output in response to device conditions, engine conditions, or both.