Abstract: Methods and apparatus provide for: a first DC bus operating to support a first DC voltage potential and for connecting to a DC input of a motor driver inverter circuit; a motor emulator circuit operating to emulate a polyphase motor and including polyphase output terminals for connecting to a polyphase output of the motor driver inverter circuit; a second DC bus operating to support a second DC voltage potential to a DC input of the motor emulator circuit; and a bi-directional DC-DC power supply coupled between the first and second DC busses, and operating to both: (i) add voltage potential to the first DC voltage potential to produce the higher, second DC voltage potential on the second DC bus, and (ii) subtract voltage potential from the second DC voltage potential to produce the lower, first DC voltage potential on the first DC bus.

Abstract: Methods and apparatus provide for: a first DC bus operating to support a first DC voltage potential and for connecting to a DC input of a motor driver inverter circuit; a motor emulator circuit operating to emulate a polyphase motor and including polyphase output terminals for connecting to a polyphase output of the motor driver inverter circuit; a second DC bus operating to support a second DC voltage potential to a DC input of the motor emulator circuit; and a bi-directional DC-DC power supply coupled between the first and second DC busses, and operating to both: (i) add voltage potential to the first DC voltage potential to produce the higher, second DC voltage potential on the second DC bus, and (ii) subtract voltage potential from the second DC voltage potential to produce the lower, first DC voltage potential on the first DC bus.

Abstract: A fuel injector for an internal combustion engine is disclosed. The fuel injector includes a housing, a valve seat, a metering orifice disc, and a needle. The housing has an inlet, an outlet, and a longitudinal axis extending therethrough. The valve seat is disposed proximate the outlet and includes a passage having a sealing surface and an orifice. The metering orifice disc is located at the outlet and has a plurality of metering openings extending therethrough. The needle is reciprocally located within the housing along the longitudinal axis between a first position wherein the needle is displaced from the valve seat, allowing fuel flow past the needle, and a second position wherein the needle is biased against the valve seat, precluding fuel flow past the needle. A generally annular channel is formed between the valve seat and the metering orifice disc. The channel tapers outwardly from a large height to a smaller height toward the orifice openings.

Abstract: Metering components of a fuel injector that allow spray targeting and distribution of fuel to be configured using non-angled or straight orifice having an axis parallel to a longitudinal axis of the fuel metering components. Metering orifices are located about the longitudinal axis and defining a first virtual circle greater than a second virtual or bolt circle defined by a projection of the sealing surface onto the metering disc so that all of the metering orifices are disposed outside the second virtual or bolt circle within one quadrant of the circle. A channel is formed between the seat orifice and the metering disc that allows the fuel injector to generate a spray pattern along the longitudinal axis that forms a flow area on a virtual plane transverse to the longitudinal axis.

Abstract: A fuel injector that allows spray targeting and distribution of fuel to be configured using non-angled or straight orifice having an axis parallel to a longitudinal axis of the subassembly. Metering orifices are located about the longitudinal axis and defining a first virtual circle greater than a second virtual circle defined by a projection of the sealing surface onto the metering disc so that all of the metering orifices are disposed outside the second virtual circle. The projection of the sealing surface converges at a virtual apex disposed within the metering disc. At least one channel extends between a first end and second end. The first end is disposed at a first radius from the longitudinal axis and spaced at a first distance from the metering disc.

Abstract: A fuel injector that includes a housing, a seat, a metering disc and a closure member. The metering orifices can be located on a first virtual circle greater than a second virtual circle as defined by a projection of a sealing surface converging at a virtual apex projected on the metering disc. The metering disc can be dimpled to increase the spray angle. Various parameters can be utilized to achieve a desired cone size and spray angle. A method of controlling spray targeting of a fuel injector is also described.

Abstract: Fuel metering components of a fuel injector that allow spray targeting and distribution of fuel to be configured using non-angled or straight orifice having an axis parallel to a longitudinal axis of the fuel metering components. Metering orifices are located about the longitudinal axis and defining a first virtual circle greater than a second virtual circle defined by a projection of the sealing surface onto the metering disc so that all of the metering orifices are disposed outside the second virtual or bolt circle within one quadrant of the circle. A channel is formed between the seat orifice and the metering disc that allows the fuel injector to generate an unified spray pattern along the longitudinal axis that forms a flow area with a plurality of uniform radii on a virtual plane transverse to the longitudinal axis.

Abstract: A fuel injector that includes a housing, a seat, a metering disc and a closure member. The metering orifices can be located on a first virtual circle greater than a second virtual circle as defined by a projection of a sealing surface converging at a virtual apex projected on the metering disc. The metering disc can be dimpled to increase the spray angle. Various parameters can be utilized to achieve a desired cone size and spray angle. A method of controlling spray targeting of a fuel injector is also described.

Abstract: A fuel injector that includes a housing, a seat, a metering disc and a closure member. The metering orifices can be located on a first virtual circle greater than a second virtual circle as defined by a projection of a sealing surface converging at a virtual apex projected on the metering disc. The metering disc can be dimpled to increase the spray angle. Various parameters can be utilized to achieve a desired cone size and spray angle. A method of controlling spray targeting of a fuel injector is also described.

Abstract: An apparatus includes a driver circuit including electronic switches operable to deliver voltage and current to a polyphase motor; and a control circuit operable to provide driver control signals to the driver circuit to commutate the electronic switches, the control circuit (i) producing the driver control signals using a first pulse width modulation (PWM) mode when the polyphase motor produces a substantially non-zero acceleration torque; and (ii) producing the driver control signals using a second PWM mode when the polyphase motor produces a substantially zero acceleration torque.

Abstract: Methods and apparatus permit: monitoring a level of a power source that provides operating power to a control circuit, the control circuit being of a type that senses signals in windings of a polyphase motor to maintain synchronization therewith; and converting kinetic energy of the polyphase motor into operating power for the control circuit when the level has fallen below a threshold level, such that the control circuit is capable of maintaining synchronization with the polyphase motor.

Abstract: Methods and apparatus for achieving a system, including: a polyphase machine having a plurality of sets of polyphase windings, each of the respective windings of a first of the sets of polyphase windings being inductively linked to one of each of the respective windings of the remaining sets of polyphase windings; a polyphase inverter operable to receive power from the windings of the first set and to produce a polyphase output; and a plurality of single-phase inverters, each operable to receive power from the windings of a respective one of the remaining sets and to produce a single-phase output, wherein each of the respective phases of the polyphase output may be coupled in series or parallel with one of the respective single-phase outputs to produce an aggregate polyphase output.

Abstract: A fuel injector that allows spray targeting and distribution of fuel to be configured using non-angled or straight orifice having an axis parallel to a longitudinal axis of a valve subassembly. Metering orifices are located about the longitudinal axis and defining a first virtual circle greater than a second virtual circle defined by a projection of the sealing surface onto the metering disc so that all of the metering orifices are disposed outside the second virtual circle. The projection of the sealing surface converges at a virtual apex disposed within the metering disc. At least one channel extends between a first end and second end. The first end is disposed at a first radius from the longitudinal axis and spaced at a first distance from the metering disc.

Abstract: An apparatus includes a driver circuit including electronic switches operable to deliver voltage and current to a polyphase motor; and a control circuit operable to provide driver control signals to the driver circuit to commutate the electronic switches, the control circuit (i) producing the driver control signals using a first pulse width modulation (PWM) mode when the polyphase motor produces a substantially non-zero acceleration torque; and (ii) producing the driver control signals using a second PWM mode when the polyphase motor produces a substantially zero acceleration torque.

Abstract: A subassembly of a fuel injector that allows spray targeting and distribution of fuel to be configured using non-angled or straight orifice having an axis parallel to a longitudinal axis of the subassembly. Metering orifices are located about the longitudinal axis and defining a first virtual circle greater than a second virtual circle defined by a projection of the sealing surface onto the metering disc so that all of the metering orifices are disposed outside the second virtual circle within one quadrant of the circle. A channel is formed between the seat orifice and the metering disc that allows the fuel injector to target fuel spray generally within an arcuate sector of at least 90 degrees about the longitudinal axis of the metering disc. A method of targeting is also provided.

Abstract: A fuel injector that includes a housing, a seat, a metering disc and a closure member. The metering orifices can be located on a first virtual circle greater than a second virtual circle as defined by a projection of a sealing surface converging at a virtual apex projected on the metering disc. The metering disc can be dimpled to increase the spray angle. Various parameters can be utilized to achieve a desired cone size and spray angle. A method of controlling spray targeting of a fuel injector is also described.

Abstract: A fuel injector that includes a housing, a seat, a metering disc and a closure member. The metering orifices can be located on a first virtual circle greater than a second virtual circle as defined by a projection of a sealing surface converging at a virtual apex projected on the metering disc. The metering disc can be dimpled to increase the spray angle. Various parameters can be utilized to achieve a desired cone size and spray angle. A method of controlling spray targeting of a fuel injector is also described.

Abstract: A fuel injector that includes a housing, a seat, a metering disc and a closure member. The metering orifices can be located on a first virtual circle greater than a second virtual circle as defined by a projection of a sealing surface converging at a virtual apex projected on the metering disc. The metering disc can be dimpled to increase the spray angle. Various parameters can be utilized to achieve a desired cone size and spray angle. A method of controlling spray targeting of a fuel injector is also described.

Abstract: A fuel injector for an internal combustion engine is disclosed. The fuel injector includes a housing, a valve seat, a metering orifice disc, and a needle. The housing has an inlet, an outlet, and a longitudinal axis extending therethrough. The valve seat is disposed proximate the outlet and includes a passage having a sealing surface and an orifice. The metering orifice disc is located at the outlet and has a plurality of metering openings extending therethrough. The needle is reciprocally located within the housing along the longitudinal axis between a first position wherein the needle is displaced from the valve seat, allowing fuel flow past the needle, and a second position wherein the needle is biased against the valve seat, precluding fuel flow past the needle. A generally annular channel is formed between the valve seat and the metering orifice disc. The channel tapers outwardly from a large height to a smaller height toward the orifice openings.

Abstract: Methods and apparatus permit: monitoring a level of a power source that provides operating power to a control circuit, the control circuit being of a type that senses signals in windings of a polyphase motor to maintain synchronization therewith; and converting kinetic energy of the polyphase motor into operating power for the control circuit when the level has fallen below a threshold level, such that the control circuit is capable of maintaining synchronization with the polyphase motor.