A fuel injection timing is made later and/or a fuel injection amount is made larger in a target cylinder to be subjected to explosive combustion subsequently, when a required rotation time that is a time required for rotation of an output shaft by a predetermined rotational angle is equal to or longer than a time threshold than when the required rotation time is shorter than the time threshold, at the time of predetermined startup control in which an engine and a clutch are controlled such that fuel injection and ignition in the engine are resumed from a state where the supply of fuel to the engine is cut off and the clutch is released and that the clutch is then engaged.

Some embodiments described herein relate to a method of operating a compression ignition engine. The method of operating the compression ignition engine includes opening an intake valve to draw a volume of air into a combustion chamber, closing an intake valve, and moving a piston from a bottom-dead-center (BDC) position to a top-dead-center (TDC) position in the combustion chamber at a compression ratio of at least about 15:1. The method further includes injecting a volume of fuel into the combustion chamber at an engine crank angle between about 330 degrees and about 365 degrees during a first time period. The fuel has a cetane number less than about 40. The method further includes combusting substantially all of the volume of fuel. In some embodiments, a delay between injecting the volume of fuel into the combustion chamber and initiation of combustion is less than about 2 ms.

A fuel injection control device is applied to an internal combustion engine including a fuel injection valve and causes a valve body to be in a valve open state accompanying an energization of the fuel injection valve to inject fuel. The fuel injection control device acquires a dynamic parameter. The fuel injection control device acquires an injection amount parameter. The fuel injection control device calculates, based on the dynamic parameter, a dynamic correction value. The fuel injection control device calculates, based on the injection amount parameter, an injection amount correction value. The fuel injection control device corrects a fuel injection using the dynamic correction value and the injection amount correction value.

A phase diagnosis method and apparatus. When it is verified that the location of an engine is valid, an oil injector performs spraying at a top center compression position; if no acceleration is detected after spraying, it indicates that a fault occurs; in order to detect whether it is a fault of phase deviation of the camshaft by 180 degrees, the oil sprayer performs spraying at the top center exhaust position and detects whether there is an acceleration; if an acceleration is detected, it indicates that the situation of the phase deviation of the camshaft by 180 degrees exists. In this way, the problem in the prior art of being unable to detect phase deviation when the phase of a camshaft is deviated by 180 degrees is solved.

Systems and methods for operating an engine that is started via expansion stroke combustion are described. In one example, the method increases air flow through the engine during an engine stopping process so that a larger amount of air may be trapped in a cylinder that is on its expansion stroke so that greater amounts of engine torque may be provided during engine starting.

Systems and methods for stopping an engine of a vehicle are described. In one example, the method anticipates when an engine is expected to stop and modifies engine operation so that less fuel is in the engine's intake ports when the engine is stopped so that the fuel may not escape the engine when the engine is restarted.

A system and method of controlling operation of an internal combustion engine are provided. The method includes performing a cylinder deactivation operation while running the engine, selecting at least one of the plurality of temperature maintenance actions to increase an exhaust temperature, and performing at least one of the plurality of temperature maintenance actions effective to increase the exhaust temperature. The plurality of temperature maintenance actions may include one or more of a charge air cooler bypass operation, an EGR cooler bypass operation, an aftertreatment system heater operation, a turbocharger bypass operation, a turbocharger geometry adjustment operation, an intake air throttle adjustment operation, and a delayed injection timing operation, or combinations thereof.

An engine system is provided, including a controller which controls devices of an engine at a given engine speed so that, when a demanded engine load is a first load, a mass ratio (G/F) of intake air inside a cylinder (containing fresh air and burnt gas) to fuel is a first G/F and mixture gas inside the cylinder combusts by flame-propagation, when the demanded load is a second load (<the first load), the G/F is a second G/F (>the first G/F) and an injection center-of-gravity is at a timing such that the entire mixture gas combusts by CI combustion, and when the demanded load is between the first and second loads, the G/F is at a third G/F (between the first and second G/Fs) and the injection center-of-gravity is at a later timing such that at least part of the mixture gas combusts by the CI combustion.

The present disclosure envisages an engine control system (100) that enables multi-mode drivability in off-road vehicles. The system (100) comprises a mode selection device (101) and an electronic control unit (ECU) (104). The mode selection device (101) is configured to receive an input from an operator for selection of at least one mode of engine operation, and to generate a mode selection signal corresponding to the input. The electronic control unit (ECU) (104) is communicatively coupled with the mode selection device (101) to receive the mode selection signal and generate at least one control signal. The electronic control unit (ECU) (104) is further configured to control a fuel injection system (106) of the vehicle based on the selected mode according to the load requirement, thereby facilitating multi-mode drivability. The system (100) allows a vehicle to operate in different operating modes as per terrain conditions.

Methods and systems are provided for maintaining combustion stability in a multi-fuel engine. In one example, a system may include first and second fuel systems to deliver liquid and gaseous fuels, respectively, to at least one cylinder of the engine, and a controller. The controller may be configured to supply the gaseous fuel to the at least one cylinder, inject the liquid fuel to the at least one cylinder to compression ignite the liquid fuel and combust the gaseous fuel in the at least one cylinder, and retard an injection timing of the injection of the liquid fuel based on a measured parameter associated with auto-ignition of end gases subsequent to the compression-ignition of the liquid fuel. In some examples, the controller may further be configured to adjust an amount of the gaseous fuel relative to an amount of the liquid fuel based on the measured parameter.