Abstract:
A multi cylinder homogeneous charge compression ignition engine (10, 110) includes actuators (81, 16) and an engine controller configured to reduce variations in combustion phasing and/or combustion energy release among the different engine cylinders (14). By sensing both the phasing and magnitude of the combustion energy release, the engine controller (29) generates control signals to combustion phase controllers and combustion energy release controllers for the engine cylinders (14). The control signals may be different from one another to reduce variations across the group of engine cylinders (14). A combustion energy release controller may be a direct injection fuel injector (16), and the combustion phase controller may be a variable intake valve actuator (81). Reducing variations in these aspects of the combustion events, allows the engine (10, 110) to operate at higher speeds and loads.
Abstract:
The present disclosure provides an internal combustion engine (10) having an engine housing (12) with at least one cylinder (14, 114) that has diameter less than about 3 inches. A fuel injector (16, 116) is provided and disposed at least partially within the at least one cylinder (14, 114), and includes a plurality of outlet orifices (22, 122, 124) having a diameter between about 50 microns and about 125 microns, or about.05 millimeters and about.125 millimeters. The injector (16, 116) may include more than one set of separately controllable fuel outlet orifices (122, 124), at least one of which could have an average diameter between about.05 millimeters and about.125 millimeters. The disclosure further provides a method of operating an internal combustion engine (10). The method includes the steps of rotating an engine crank shaft (30) of the engine (10) at a speed greater than about 5000 revolutions per minute, injecting a quantity of fuel into each of the cylinders (14, 114), and burning at least every fourth piston stroke a sufficient quantity of the injected fuel to yield a brake mean effective pressure of at least about 200 lbs. per square inch.
Abstract:
A method of operating a power system (12) of a machine (10) is provided. The method includes selectively supplying power from an engine (14) to one or more other components of the machine. The method also includes, during at least some load increases on the power system, supplementing power from the engine with power from an additional power source (42) while recirculating exhaust gas through the engine. As alternative, engine output power may be increased.
Abstract:
A fuel composition for a homogenous charge compression ignition engine includes a combination of a gasoline fuel and a diesel fuel, the combination having a derived cetane number of from about 19.9 to 45 as determined in accordance with ASTM method D6890. A method for making the fuel composition provides for blending presently available gasoline fuel and diesel fuel together in a ratio to obtain the desired fuel composition.
Abstract:
A powertrain (12) including an HCCI engine (14) is disclosed. The HCCI engine (14) is configured to supply mechanical power, and a generator (18) operably coupled to the HCCI engine (14) is configured to convert at least a portion of the mechanical power into one of electric energy and hydraulic energy. The powertrain (12) further includes a motor (20) operably coupled to the generator (18). The powertrain (12) also includes an energy storage device (30) operably coupled to the generator (18) and the motor (20). The powertrain (12) further includes a controller (32) configured to control the powertrain (12) such that energy stored in the energy storage device (30) is supplied to the motor (20) when the HCCI engine (14) supplies insufficient mechanical power to the generator (18) to supply the motor (20) with sufficient power to meet power requirements of the powertrain (12), until the HCCI engine (14) supplies sufficient mechanical power to the generator (18) to supply the motor (20) with sufficient power to meet the power requirements of the powertrain (12).
Abstract:
A powertrain (12) including an HCCI engine (14) is disclosed. The HCCI engine is configured to supply mechanical power, and a generator (18) operably coupled to the HCCI engine is configured to convert at least a portion of the mechanical power into one of electric energy and hydraulic energy. The powertrain further includes a motor (20) operably coupled to the generator. The powertrain also includes an energy storage device (30) operably coupled to the generator and the motor. The powertrain further includes a controller (32) configured to control the powertrain such that energy stored in the energy storage device is supplied to the motor when the HCCI engine supplies insufficient mechanical power to the generator to supply the motor with sufficient power to meet power requirements of the powertrain, until the HCCI engine supplies sufficient mechanical power to the generator to supply the motor with sufficient power to meet the power requirements of the powertrain.
Abstract:
A method of operating an engine system should produce relatively low concentrations of various emissions without compromising a desired power output of the system. In order to operate an engine system of the present disclosure, a predetermined total amount of fuel injected into at least one combustion chamber is apportioned into at least a first amount and a second amount of fuel. The first amount of fuel is injected into the at least one combustion chamber during non-auto ignition conditions. The second amount of fuel is injected into the at least one combustion chamber during auto-ignition conditions. When the engine system is in a mid-low engine load range, the second amount of fuel is one of equal to or less than 15% of the predetermined total amount of fuel. When the engine system is in a high engine load range, the second amount of fuel is greater than 15% of the predetermined total amount of fuel.
Abstract:
A method of mixed mode operation of an internal combustion engine (10) includes the steps of controlling a homogeneous charge combustion event timing in a given engine cycle, and controlling a conventional charge injection event to be at least a predetermined time after the homogeneous charge combustion event. An internal combustion engine (10) is provided, including an electronic controller (30) having a computer readable medium with a combustion timing control algorithm recorded thereon, the control algorithm including means for controlling a homogeneous charge combustion event timing and means for controlling a conventional injection event timing to be at least a predetermined time from the homogeneous charge combustion event.
Abstract:
A homogeneous charge compression ignition engine (10, 110) is set up by first identifying combinations of compression ratio and exhaust gas percentages for each speed and load across the engines operating range. These identified ratios and exhaust gas percentages can then be converted into geometric compression ratio controller settings and exhaust gas recirculation rate controller settings that are mapped against speed and load, and made available to the electronic engine controller (29). This provides the engine controller (29) with a look up table of what compression ratio and exhaust gas rates should be at each speed and load. The engine controller (29) also balances at least one of combustion phasing and energy release among a plurality of cylinders (14) in order to enable higher load operation.
Abstract:
The method includes reducing output of one or more cylinders of an engine system without reducing output of the remaining icylinders of the engine system. The method also includes reducing imbalance of the engine system by supplementing the engine system with power in response to the output reduction of the one or more cylinders.