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.

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.

A knocking control method in a power generation system (1) which includes a gas engine (20) including a plurality of air cylinders (21) and a knocking detection unit (51) configured to detect knocking in each of the air cylinders (21). The knocking control method includes a first control step of delaying an ignition timing for at least one of the air cylinders (21) when the knocking detection unit (51) has detected knocking; a second control step of reducing an amount of gas supplied to at least one of the air cylinders (21) when the knocking has not been eliminated by the first control step; and a third control step of shutting off supply of a gas to any of the air cylinders (21) in which the knocking has occurred.

A method for accelerating a vehicle from rest, including controlling an engine according to a first control strategy; receiving a mode indication selecting a launch control mode for accelerating; controlling the engine according to a second control strategy; in response to greater than zero accelerator position, controlling to increase throttle valve opening and engine control operational conditions to limit engine torque output; while in the second control strategy, receiving an indication to end control by the second control strategy; and in response to indication, controlling according to the first control strategy causing the vehicle to accelerate from rest, the first acceleration rate greater than the second rate corresponding to accelerating from rest after sequentially controlling according to the first and second control strategies; the second acceleration rate corresponding to accelerating from rest by controlling according to the first control strategy without previously controlling according to the second control strategy.

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.

A control system for a power source is disclosed. The control system includes a first sensor module and a second sensor module to generate signals indicative of an ambient condition of the power source and an operating parameter of an engine of the power source, respectively. The control system further includes a controller that receives signals indicative of the ambient condition and the engine operating parameter and determines a first power output based on the ambient condition and a second power output based on the engine operating parameter. A final power output is further determined based on the first and second power outputs, which is further compared with a predetermined power output of the engine. A power conversion device that is coupled to the engine is further controlled to regulate a power output of the power source based on the comparison between the final and predetermined power outputs.

Disclosed is a control method for an internal combustion engine (3) including a power generation motor (4) driven by a power of the internal combustion engine (3) and a damper (30) provided between the internal combustion engine (3) and the power generation motor (4) in a power transmission path, wherein a maximum value of a torque fluctuation generated in an event of a misfire occurring in a cylinder of the internal combustion engine (3) is larger than a value at which a displacement of a main damper (30a) of the damper (30) is allowed to be suppressed to be smaller than a displacement at which abutting occurs on a first stopper (31a) by a counter torque of the power generation motor (4), and the control method includes limiting a torque (Te) of the internal combustion engine (3) within a range in which a displacement of the main damper (30a) is allowed to be controlled to be smaller than a displacement at which abutting occurs on the first stopper (31a) by a counter torque of the power generation motor (4).

Provided are a work machine, a power unit, and a diesel engine of a work machine that make it possible to reduce emitted noxious substances to levels below reference values stipulated by exhaust gas regulations in advanced countries and regions while also omitting or simplifying a post-treatment device. A hydraulic pump is driven by a diesel engine that limits maximum output torque in a low revolution speed region lower than a high revolution speed region including a rated revolution speed in such a manner that the maximum output torque has a characteristic of intermediate torque lower than torque of a maximum output horsepower point at the rated revolution speed, and a hydraulic actuator is driven by hydraulic fluid delivered from the hydraulic pump.

A controller for an internal combustion engine includes an electronic control unit. The electronic control unit is configured to increase an air amount that is suctioned into a cylinder while maintaining the lean air-fuel ratio as a first torque increasing operation in a case where target torque is increased during the operation at the lean air-fuel ratio such that torque is increased. The electronic control unit is configured to compute limit torque as an upper limit of the torque that can be realized in a case where the lean air-fuel ratio is kept for a certain time from a current time point. The electronic control unit is configured to switch to the operation at the theoretical air-fuel ratio and increase the torque as a second torque increasing operation in a case where the target torque becomes higher than the limit torque during execution of the first torque increasing operation.

A drive torque control device of a vehicle that includes a drive source for generating a drive source torque, a brake mechanism for generating a braking toque, and a drive wheel for driving the vehicle. The drive torque control device includes a target drive wheel torque calculator configured to calculate a target drive wheel torque, a drive source torque control unit configured to estimate a drive source torque limit value, calculate a target drive source torque based on the target drive wheel torque and the drive source torque limit value, and control the generation of the drive source torque by the drive source based on the target drive source torque, and a braking torque control unit configured to calculate a target braking torque based on the target drive wheel torque and the target drive source torque, and control the generation of the braking torque by the brake mechanism based on the target braking torque.