Embodiments describe a method of controlling a two-stroke internal combustion engine is shown. The method includes selecting one set of two or more sets of engine parameter inputs or a weighted value of two or more sets of engine parameter inputs, determining an engine output parameter from the selection, and utilizing the determined engine output parameter to control one or more engine operations; re-selecting one set of two or more sets of engine parameter inputs or a weighted value of two or more sets of engine parameter inputs during engine operation, utilizing the reselected output parameters to adjust one or more engine operations. Each set of engine parameter inputs includes a direct measurement of crankcase pressure and engine speed and optionally one or more of barometric pressure, exhaust valve position, air temperature, engine coolant temperature, exhaust temperature, boost pressure, crankshaft position and direction of rotation, humidity, fuel pressure, fuel temperature, detonation sensor level, exhaust oxygen content, and throttle valve angle.

Disclosed are a hybrid electric vehicle capable of controlling starting of an engine in order to more efficiently realize heating and an engine control method therefor. The method of controlling an engine of a hybrid electric vehicle of the disclosure includes determining whether the engine is in a warmed-up state when a fully automatic temperature control system makes a heating request, making an engine startup request for heating to an engine management system configured to control the engine when the engine is in the warmed-up state, and selectively requesting the engine management system to perform cylinder deactivation (CDA) control on at least some of a plurality of cylinders of the engine depending on whether the engine is in an idling state.

An apparatus includes an engine friction module in operative communication with an engine and structured to interpret engine operation data indicative of an engine friction amount, and a stop/start module structured to compare the engine operation data with predetermined protective criteria that includes an engine friction threshold and to turn off the engine for at least a portion of time based on the engine friction threshold exceeding the engine friction amount.

A method for accelerating the warming-up of a power unit of a vehicle including an internal combustion engine, the unit needing to undergo a test and/or maintenance operation during which the vehicle remains stationary with its engine running, the unit needing to have achieved a minimum operating temperature prior to the test and/or the operation, the unit including a fuel injection system with a high-pressure pump supplying pressurized fuel to one or more injectors, the pressurizing of the fuel by the pump being controlled according to a combustion configuration that requires a nominal pressure value dependent on operating parameters including an engine speed and engine torque, the method including a step of warming up the unit by maintaining a greatly accelerated idling speed, which is effected at a modified pressure value higher than the nominal pressure value.

An engine-driven working machine according to the present invention has a controller and a muffler. The controller is operated from starting of the engine in a rotational speed limitation mode in which the engine is prevented from rotating at a rotational speed that is higher than the predetermined limitation rotational speed. The controller forces to stop the engine, after a predetermined period has passed, during which the engine operates in the rotational speed limitation mode.

A control system for an exhaust gas recirculation system for an engine is provided. The control system includes an exhaust gas recirculation (EGR) cooler having a coolant flowing therethrough. The control system includes an externally controlled coolant set-point circuit associated with the EGR cooler. The control system also includes a controller communicably coupled to the externally controlled coolant set-point circuit. The controller is configured to receive a first signal indicative of a readiness of the engine to load. The controller is configured to receive a second signal indicative of a temperature of the coolant. The controller is configured to receive a third signal indicative of a first temperature zone associated with the engine. Further, the controller is configured to modulate a set-point temperature of the coolant over a range of temperatures based on the received signals and a temperature gradient of the coolant.

Aspects of the disclosure are directed to characterizing effective vehicle frontal area. As may be implemented in accordance with one or more embodiments, one or more operating parameters of the vehicle are obtained. Such parameters may be obtained during one or more qualifying periods of time, such as those periods in which an operating parameter or parameters such as speed and/or acceleration are within a range of values. A value that provides an estimate of the vehicle frontal area is then generated based on the one or more operating parameters.

An apparatus includes an engine friction module in operative communication with an engine and structured to interpret engine operation data indicative of an engine friction amount, and a stop/start module structured to compare the engine operation data with predetermined protective criteria that includes an engine friction threshold and to turn off the engine for at least a portion of time based on the engine friction threshold exceeding the engine friction amount.

Aspects of the disclosure are directed to characterizing vehicle mass. As may be implemented in accordance with one or more embodiments, one or more operating parameters of the vehicle are obtained, and at least one qualifying period of time is identified in which the operating parameter or parameters are within a range of values associated with the parameter. A value that provides an estimate of the mass is then generated based on the one or more operating parameters.

A control apparatus for a diesel engine includes a neighboring temperature estimating section which estimates a temperature of a neighborhood of a glow plug that heats an interior of a cylinder upon startup, and a supercharging pressure control section which controls a supercharging pressure in such a way that a rotation fluctuation of the engine does not increase, on the basis of the estimated temperature of the neighborhood of the glow plug.