452results about How to "Improve transient response" patented technology

Systems and methods for turbocharging an internal combustion engine include operating two turbochargers in a series configuration for a first operating region and a parallel configuration for a second operating region. Systems and methods for controlling exhaust gas recirculation (EGR) in a turbocharged internal combustion engine provide low pressure EGR upstream of a compressor inlet for a first operating region and high pressure EGR downstream of a compressor outlet for a second operating range to further improve turbocharger operating margin and overall efficiency.

The present invention relates to a circuit layout of a switch type regulator and control method thereof. The switch type regulator according to one embodiment of the invention includes: (1) a filter network connected to the output terminal, wherein the output voltage of the output terminal is generated by an input source; (2) an active switch connecting the input source to a wave filter circuit, wherein the active switch is periodically connected and disconnected, and the conducting duty cycle of the switch period is modulated by a PWM control signal; (3) a comparator, which receives output feedback signals, a delay signal and a reference delay, and provides the PWM control signal; (4) a delay programming circuit for generating the delay signal and a ramp control signal, wherein the delay signal is set up based on the status of the input source and the output voltage, to obtain an operating status with fundamentally constant frequency.

System, methods, and strategies for regulating charge air temperature in an intake manifold of an internal combustion engine (50) by controlling the flow rate and temperature of liquid engine coolant flowing through a liquid flow path of a charge air cooler (72) that is in heat exchange relationship with charge air entering the intake manifold over a range that provides for the charge air to be selectively heated and cooled by liquid engine coolant. The invention provides flexible control that is useful in controlling exhaust gas temperature for regeneration and/or efficiency restoration of exhaust after-treatment devices (66) as well as improved engine performance.

An intelligent treadmill is described with modifications to existing treadmills, and associated methodology. The invention allows the conveyor belt automatically keeps track of and fixes the user's position dynamically with respect to a stationery reference point of the treadmill by adjusting its own speed free hands. Two position measurement techniques and their corresponding belt speed control algorithms are described. Other features of the invention allow users to perceive in real time how their surroundings would be changing by means of video, incline of platform, fan speed, sound and illumination as if they were in fact running in the natural environment. Real time positions of the runner and his partners on other treadmills with respect to a chosen track are displayed. The invention also utilizes a vectored controlled 2/3-phase AC induction motor or a BLDC motor to drive the conveyor belt for energy efficiency and fast response.

An autozeroed comparator controls a frequency f_sw of the input voltage inputted to a DC/DC converter. A digital frequency synchronization circuit is connected to the autozeroed comparator so as to form a phase locked loop, wherein the DES circuit controls the hysteretic window of the autozeroed comparator so as to lock f_sw to a clock reference frequency. A plurality of slave phase circuits may be connected to the master phase circuit including the DFS circuit and the autozeroed comparator. Duty cycle calibration circuits adjust a duty cycle signal applied to each of the slave phase circuits, in response to average current measured in the slave phase circuits, so that each slave phase circuit is synchronized with the master phase circuit. A 6 A 90.5% peak efficiency 4-phase hysteretic quasi-current-mode buck converter is provided with constant frequency and maximum ±1.5% current mismatch between the slave phases and the master phase.

A system and method to control engine valve timing to improve air-fuel control in an engine with valves that may be deactivated. Valves that may be deactivated are controlled in a manner to improve detection of individual cylinder air-fuel ratios.

A method and apparatus to dynamically modify the internal compensation of a low drop-out (LDO) voltage regulator is presented. The process involves creating an additional equivalent series resistance (ESR) from an internal circuit. The additional ESR of the internal circuit is sufficient to ensure the DC output stability. This allows the ESR of the output capacitance to be reduced to zero if desired, for improved transient response.

A single-inductance double-output switch power supply based on ripple control comprises a power level module, a filter and voltage sampling module, a secondary voltage sampling module, a secondary ripple control module, a primary voltage sampling module, a primary control module and a driving module, wherein the output of the power level module is connected with the filter and voltage sampling module, the output of the filter and voltage sampling module is connected with each of the secondary voltage sampling module and the primary voltage sampling module, the output of the secondary voltage sampling module is connected with the secondary ripple control module, the output of the primary voltage sampling module is connected with the primary control module, the outputs of the secondary ripple control module and the primary control module are connected with the driving module, and the output of the driving module is connected with the power level module and the secondary ripple control module and also outputs a slope compensation power source Islope signal to the secondary voltage sampling module.

A system for transferring mechanical torque variably between a plurality of rotating machines in a turbofan engine. Two devices are used, where the first device relies upon magnetic properties of a planetary magnetic gearbox to couple the magnetic machines. The second device is used to variably control the torque transfer between the magnetic machines. The system couples rotating shafts rotating at differing speeds within a turbofan engine for controllably transferring power. To transfer power in the system, a fixed gear ratio is obtained by coupling the relatively high- and low-speed engine shafts to an epicyclic magnetic gearbox.

The invention discloses a filling in/pulling out current rapid response linear voltage regulator and a regulating method. The regulator comprises a reference voltage source, two error amplifiers, an N-channel MOS (Metal Oxide Semiconductor) tube I, an N-channel MOS tube II and a static current control unit. The static current control unit consists of a current summing unit, a pulling out current subtracting unit and a filling-in current subtracting unit. In the voltage regulating method, two error amplifiers dynamically monitor the voltage variation of a source electrode of the N-channel MOS tube I and a drain electrode of the N-channel MOS tube II when the pulling-out and filling-in current occur and dynamically control the gate-to-source voltage of two N-channel MOS tubes so that the source voltage of the N-channel MOS tube I and the drain voltage of the N-channel MOS tube II vary toward the same direction. The invention has novel and reasonable design, convenient circuit connection, small area of circular bard and good use effect, ensures the large-load stability and greatly improves the transient response of an LDO (Low Dropout Regulator).

A current detection circuit of the present invention has a switching device 1; an auxiliary switching device 2; an offset voltage source comprising an offset resistor device 7 and a current source circuit 8; a compensation circuit, comprising a differential amplifier 4 and a compensation transistor 5, for adjusting the output current of the auxiliary switching device 2 so that the potential obtained by subtracting the voltage drop across the offset resistor device 7 from the output potential of the auxiliary device 1 is equal to the output potential of the auxiliary switching device 2, being configured that the detection level of the current flowing in the switching device 1 is shifted by an offset amount.

In a first aspect, in a Primary Side Regulation (PSR) power supply, some primary current pulses are used to forward bias an output diode such that an auxiliary winding voltage can be properly sampled after each pulse. The samples are used to regulate the power supply output voltage (VOUT). Other primary current pulses, however, are of a smaller peak amplitude. These pulses are not used for VOUT regulation, but rather are used to determine whether the VOUT has dropped. In a second aspect, a transient current detector circuit within the PSR controller integrated circuit detects whether an optocoupler current has dropped in a predetermined way. If the TRS current detector detects that the optocoupler current has dropped, then the power supply stops operating in a sleep mode and is made to operate in another higher power operating mode in which the power supply switches.

A positive displacement power extraction compensation device is used to start and control the operation of engines. The device includes a positive displacement fixed vane compressor having a rotor connected with a drive shaft, a combustor connected with the compressor and a positive displacement power extraction device also having a rotor connected with a drive shaft. The compressor and power extraction devices are configured to displace unequal volumes of air at a given speed, so that combustion gases from the combustor exert less force on the compressor drive shaft as on the power extraction device drive shaft.

A control circuit and method are provided to generate a modulation signal to operate a power stage in a DC/DC PWM converter such that the DC/DC PWM converter is controlled to operate with high switching frequency in light load stead state, once load transient happens, it still operates with high switching frequency for good transient response, and in heavy load stead state, it is controlled to operate with low switching frequency for good efficiency.

The invention discloses a dynamic discharge circuit and an LDO (Low Dropout Regulator) integrated with the same. The dynamic discharge circuit comprises a first error amplifier, a first MOS (Metal Oxide Semiconductor) tube and a first capacitor. The LDO comprises a second error amplifier, a second PMOS (P-channel Metal Oxide Semiconductor) tube, a second capacitor, a first resistor and a second resistor. The dynamic discharge circuit provided by the invention, under the premise of not significantly increasing the static power consumption, can detect the change of voltage at the output terminal when the LDO load jumps from heavy load to light load, and form a discharge channel for leading the output of the LDO to be grounded, thereby greatly reducing the uprush maximum of the output; and the LDO integrated with the dynamic discharge circuit can greatly reduce the uprush maximum of output voltage, thereby shortening the recovery time of the LDO circuit from a transient state to a steady state and improving the transient response of the LDO circuit.