Methods and systems to determine a presence or absence of engine misfire or spark plug fouling are presented. In one example, rates of change in engine speed are arranged in engine data blocks and root mean square values for the rates of change in engine speed are determined. The presence or absence of engine misfire or spark plug fouling may be based at least in part on the root mean square values.

A system for supplying hydrogen gas to an engine is disclosed. The system includes a main line configured to send hydrogen gas produced in a hydrogen gas producer by electrolysis to a supply line; a sub-line configured to send hydrogen gas from a hydrogen absorbing alloy cylinder to the main line, a governor configured to maintain an engine rotation speed within certain range; and a control device. The governor sends a signal corresponding to the engine rotation speed to the control device. A pressure regulating valve is disposed in the sub-line to be downstream with respect to the hydrogen absorbing alloy cylinder to regulate a supply amount of added hydrogen. An opening degree of the valve is adjusted based on a signal from the control device corresponding to the opening degree of the valve for supplying the added hydrogen with an amount according to a load state of the engine.

A system is provided for controlling engine fueling and includes an internal combustion engine, a fuel source, means for delivering fuel from the fuel source to the engine, and a controller configured to control the fuel delivering means according to a first operational mode so that, upon attaining a predetermined operational state of the engine, an amount of fuel delivered to the engine per unit time is kept constant. The system will typically but not necessarily be provided in a vehicle such as a truck or a passenger automobile. A method for controlling engine fueling is also provided.

A method for operating an internal combustion engine having multiple cylinders. A warm-up operation is carried out after the internal combustion engine has been started, during which a speed of the internal combustion engine is limited to a limit value. The limit value is selected during the warm-up operation at least temporarily as a function of a starting temperature of the internal combustion engine.

An agricultural production machine, such as a combine, forage harvester or tractor, is disclosed. The agricultural production machine includes a drive assembly with an internal combustion engine, an electric energy supplying system having an electric auxiliary machine, and a driver assistance system with a control system that is configured to control the internal combustion engine, the electric auxiliary machine, and at least one power consumer that can be driven by the drive assembly. The internal combustion engine operates at the lowest possible rotational speed, with the electric energy supplying system configured to support the internal combustion engine by connecting the electric auxiliary machine at this lowest possible rotational speed when connecting a load.

A method for controlling a rotational speed of an output shaft of a propulsion unit. The method includes determining a speed setpoint value, indicative of a rotational speed setpoint for the output shaft, and an actual speed value, indicative of an actual rotational speed of the output shaft, determining an acceleration value using an acceleration value determination procedure comprising employing an acceleration conversion function that uses the speed setpoint value, the actual speed value and an acceleration setting member as inputs and which produces a resulting value to be used for determining the acceleration value, the acceleration conversion function being such that different resulting values can be obtained for the same set of the speed setpoint value and the actual speed value but for different choices of the acceleration setting member, determining a torque request value using a torque conversion operation that uses the acceleration value, and controlling the propulsion unit using the torque request value.

An electronic control unit (100), which serves as a control device for an internal combustion engine, executes feedback control for controlling the torque of an internal combustion engine (10) so as to coincide the rate of decrease in engine rotational speed with a target rate of decrease in the engine rotational speed. The electronic control unit (100) calculates a required torque that is a torque required to keep the engine rotational speed at a constant rotational speed, and increases a feedback gain in the feedback control as the calculated required torque increases.

Generators and methods for shutting down generators in confined spaces. One generator includes an internal combustion engine, an alternator, a power outlet, and an electronic processor communicatively coupled to the engine. The electronic processor is configured to obtain an engine speed of the engine, and determine that the engine speed is below an engine speed threshold. The electronic processor is further configured to determine, in response to determining that the engine speed is below the engine speed threshold, that a predetermined number of a plurality of secondary parameters of the generator have crossed respective secondary thresholds. The electronic processor is further configured to shut down the generator in response to determining that the predetermined number of the secondary parameters have crossed the respective second thresholds.

A system and method for automatically controlling an engine of a turf-care vehicle. The method comprises receiving, at an engine speed control module, a mode selection input from an engine speed control mode selection device. The mode selection input is indicative of one a plurality of engine speed control modes, and all of the engine speed control modes are implementable by the engine speed control module. The method additionally comprises monitoring, via the engine speed control module, an operating status of one or more vehicle systems and/or one or more vehicle sensors. The method further comprises automatically controlling, via the engine speed control module, a rotational speed of the engine based at least in part on the selected engine speed control mode and the operating status of the one or more vehicle systems and/or one or more vehicle sensors.

The present disclosure relates to an agricultural work vehicle comprising: a vehicle body supporting an engine; a hydraulic transmission for changing speed with respect to the drive generated by the engine; an HST pedal which is connected to a swash plate control shaft of the hydraulic transmission and rotates the swash plate control shaft; a sensor unit which is directly coupled to the swash plate control shaft, and senses the rotation of the swash plate control shaft to acquire sensing values; and a control unit for controlling the rotation speed of the engine according to the sensing values.