Abstract: A technique for merging, via lattice surgery, a color code and a surface code, and subsequentially decoding one or more rounds of stabilizer measurements of the merged code is disclosed. Such a technique can be applied to bottom-up fault-tolerant magic state preparation protocol such that an encoded magic state can be teleported from a color code to a surface code. Decoding the stabilizer measurements of the merged code requires a decoding algorithm specific to the merged code in which error correction involving qubits at the border between the surface and color code portions of the merged code is performed. Error correction involving qubits within the surface code portion and within color code portion, respectively, may additionally be performed. In some cases, the magic state is prepared in a color code via a technique for encoding a Clifford circuit design problem as an SMT decision problem.

Abstract: A fault-tolerant quantum computing scheme implements quantum computing based on three-dimensional cluster states using just a small number of physical components. The technique may be implemented using a single actively controlled qubit [100], e.g., a quantum emitter, and a pair of delay line loops [106, 108], which can be physically realized using existing technologies in quantum photonic and phononic systems. A three-dimensional cluster state is prepared by using the actively con-trolled qubit to generate data qubits that propagate through the two delay line loops, interact with the actively controlled qubit, and then are measured by a detector [110].

Abstract: Controlling a waste heat recovery system includes determining a difference in temperature (sensed ?T) between a working fluid (15) downstream of a first evaporator (16) and a working fluid (15) downstream of a second evaporator (20) wherein the first evaporator (16) and the second evaporator (20) are in parallel. Each receives engine exhaust gas and working fluid. At least a first valve (84) is selectively actuated to regulate flow of the working fluid into the first evaporator (16) and the second evaporator (20) responsive to the difference in temperature (sensed ?T). The first valve (84) regulates a flow of the working fluid into the first evaporator (16) and a second valve (86) regulates a flow of the working fluid into the second evaporator (20). A first feedforward signal (157) is generated for control of the first valve (84) based at least in part on the difference in temperature (sensed ?T).

Abstract: An engine system is disclosed that includes an engine, a compound boosting system, and a variable valve. The compound boosting system includes first and second boosters, and is configured and dimensioned to compress air flowing into the engine to increase power and performance The first booster includes a first compressor positioned in a flow path of incoming air, a turbine, and a shaft interconnecting the compressor and the turbine. The second booster is electric and includes a second compressor. The valve is configured, dimensioned, and positioned such that in the open positions, when the second booster is running, air can be recirculated from adjacent an outlet of the second compressor to the inlet of the second compressor to mitigate surge in the second booster.

Abstract: A control system for a vehicle comprises a controller (114), with the controller (114) further including a processor and a memory. The memory stores instructions executable by the processor such that the controller is programmed to detect a temperature difference (?TEvap), select a flow ratio, and select a valve opening setting (242, 244, 250, 252, 258, 260). The difference in temperature (?TEvap) is between a working fluid (15) downstream of a first evaporator (16) and a working fluid (15) downstream of a second evaporator (20). The flow ratio is a desired flow ratio based on the difference in temperature (?TEvap). The valve opening setting (242, 244, 250, 252, 258, 260) for each of a first valve (84) regulating flow of the working fluid into the first evaporator (16) and a second valve (86) regulating flow of the working fluid into the second evaporator (20) based on the flow ratio.

Abstract: A method of controlling exhaust gas recirculation (EGR) in a turbocharged compression-ignition engine system including an engine, an induction subsystem in upstream communication with the engine, an exhaust subsystem in downstream communication with the engine, a high pressure EGR path between the exhaust and induction subsystems upstream of a turbocharger turbine and downstream of a turbocharger compressor, and a low pressure EGR path between the exhaust and induction subsystems downstream of the turbocharger turbine and upstream of the turbocharger compressor. A target total EGR fraction for compliance with exhaust emissions criteria is determined, then a target HP/LP EGR ratio is determined to optimize other engine system criteria within the constraints of the determined target total EGR fraction.

Abstract: A method of controlling exhaust gas recirculation (EGR) in a turbocharged engine system including multiple EGR paths to account for at least one of system constraints, or dead time and/or lag time associated with at least one of the EGR paths.

Abstract: A number of variations may include a method comprising selectively actuating an inlet swirl device to cause a compressor to windmill at a higher speed during an operation mode where fuel consumption of an engine in the vehicle is at a minimal or before an acceleration event.

Abstract: A solenoid driver may be provided for a solenoid with a coil selectively energized by a power supply in a first polarity. An energy storage device may be charged by the power supply. A circuit may be configured to connect the energy storage device to the coil in a second polarity that is a reverse of the first polarity whenever the power supply is selectively turned off or unexpectedly interrupted.

Abstract: A number of variations may include a thermal management system having an engine and a coolant system comprising a coolant circuit and a coolant pump, wherein the coolant pump is operated by an electronic control unit that operates independently of the engine, and wherein the electronic control unit is constructed and arranged to operate the coolant pump at a higher speed than the engine speed multiplied by pulley ratio during engine warm up.

Abstract: A product and method are disclosed for use with an engine including an intake passage providing combustion air to the engine. An exhaust passage may channel expelled combustion gases from the engine. A first compressor may be disposed in the intake passage, and a turbine may be disposed in the exhaust passage and may be coupled to the first compressor. The turbine may be arranged to rotate as a result of a flow of exhaust gases through the exhaust passage to drive the first compressor. A flow control device may be disposed in the intake passage upstream from the first compressor. An alternate passage may be provided having a first end opening to the intake passage upstream from the flow control device and having a second end opening to the intake passage downstream from the flow control device. A second compressor may be disposed in the alternate passage, with a drive unit adapted to drive the second compressor.

Abstract: A number of variations may include a method including controlling low pressure EGR flow rates using air intake throttle with a variable swirl device or throttle valve, or using exhaust throttling.

Abstract: A number of variations may include a method including controlling low pressure EGR flow rates using air intake throttle with a variable swirl device or throttle valve, or using exhaust throttling.

Abstract: Controlling turbocharger boost pressure using exhaust pressure estimated from engine cylinder pressure.

Abstract: A thermal system with a multifunction valve for improving the cold start procedure for a vehicle internal combustion engine. The multifunction valve regulates and apportions the flow of coolant from the engine to either or both of the coolant pump and the radiator.

Abstract: Methods and systems for controlling the operation of a dual mode engine accessory, such as a dual mode cooling pump. The dual mode device has two modes of operation, an electric motor operation and a mechanical pulley-driven operation. A friction clutch mechanism controlled by the control system is utilized to switch between the two modes of operation. The speed of the electrical motor can be changed to be substantially the same as, or changed in the direction of, the speed of the mechanical pulley-driven system.

Abstract: Methods and systems for controlling the operation of a dual mode engine accessory, such as a dual mode cooling pump. The dual mode device has two modes of operation, an electric motor operation and a mechanical pulley-driven operation. A friction clutch mechanism controlled by the control system is utilized to switch between the two modes of operation. The speed of the electrical motor can be changed to be substantially the same as, or changed in the direction of, the speed of the mechanical pulley-driven system.

Abstract: According to one implementation of an engine system, a power device is selectively actuated to provide energy to a storage device. Energy from the storage device is selectively provided to a boost assist device to supplement the normal energy supply to a boost device and enable an increased power output of the engine in at least certain engine or vehicle operating conditions. In one form, the power device may be a source of electrical energy and the storage device is capable of storing an electrical charge. In another form, the power device is a fluid pump and the storage device is capable of storing pressurized fluid. Various methods may be employed to control operation of the power device and energy storage in the storage device.

Abstract: Methods of engine system control responsive to oxygen concentration estimated from engine cylinder pressure.

Abstract: Controlling turbocharger boost pressure using exhaust pressure estimated from engine cylinder pressure.