Patent application number | Description | Published |
20090078236 | System and Method for Controlling the Fuel Injection Event in an Internal Combustion Engine - A controller, in electrical communication with the one or more of the injectors and a high-pressure fuel pump, generates a first signal responsive to which the valve in the injector opens or closes and a second signal responsive to which the high-pressure fuel pump increases or decreases the pressure level in the fuel accumulator. The system may also include one or more sensors for detecting a temperature of air in an air manifold, a pressure within the air manifold and a barometric pressure. The controller is programmed to estimate an in-cylinder gas density using data received from the sensors. The controller accesses a database having data representative of one or predetermined in-cylinder gas densities that are associated with one or more predetermined fuel injection parameters. The controller then generates one or more commands indicative of the fuel injection parameters that are associated with a predetermined in-cylinder gas density. | 03-26-2009 |
20090249783 | Locomotive Engine Exhaust Gas Recirculation System and Method - A system, in certain embodiments, includes a low pressure exhaust gas recirculation (EGR) system configure to route exhaust gas upstream of a compressor coupled to an intake of an engine in a low temperature environment. The system also includes a high pressure EGR system configure to route exhaust gas downstream of the compressor and upstream of the intake at a high altitude and/or in a low pressure environment. The system, in some embodiments, also may include a flow control configured to change flow of the exhaust gas of the low pressure and high pressure EGR systems based on operating limits and environmental conditions including temperature and pressure. | 10-08-2009 |
20100018478 | COMBUSTION METHOD, SYSTEM, AND ARTICLE - A method includes mixing air and converted fuel from an on-board fuel converter in a fuel mixer to form an air-converted fuel mixture, the air-converted fuel mixture includes a short chain hydrocarbon; mixing the air-converted fuel mixture with a high specific heat diluent to form an air-diluent-converted fuel mixture; mixing the air-diluent-converted fuel mixture with a first amount of fuel to form a homogenous mixture. A system and article are included. | 01-28-2010 |
20120279245 | COMPACT DISCHARGE DEVICE FOR THE REFRIGERATION COMPRESSOR OF AN APPLIANCE - A discharge device for a refrigeration compressor is provided. The device can include a discharge tube connected with the discharge of the refrigeration compressor. A bellows surrounds a perforated portion of the discharge tube. The length of the discharge tube can be minimized to decrease pressure loss. The discharge can be insulated to prevent the distribution of heat to the compressor and/or to allow for the recovery of heat energy later in the refrigeration cycle. | 11-08-2012 |
20130133347 | SYSTEM AND METHOD FOR COMPRESSION OF FLUIDS - A fluid compressor for compressing fluids and a method for operating the same are provided. The fluid compressor includes a compression chamber with an inlet for the fluid and an outlet for compressed fluid. The fluid compressor further includes a piston disposed within the compression chamber. The fluid compressor includes a driving system that includes piezoelectric actuator configured to cause displacement of the piston in the compression chamber. The driving system further includes an amplifying element that is coupled to the piezoelectric actuator in the direction of the movement of the piston to enhance the displacement of the piston caused by the piezoelectric actuator. One end of the amplifying element is fixed to a base of the fluid compressor and the piezoelectric actuator is disposed between the amplifying element and the piston. | 05-30-2013 |
20150226468 | LINEAR OSCILLATION SYSTEM HAVING A SUSPENSION SYSTEM AND A METHOD FOR ASSEMBLING THE SAME - A linear oscillation system comprising a housing, a stationary assembly, a moveable assembly and a suspension system is disclosed. The suspension system is mechanically coupled between the moveable assembly and the housing. The suspension system comprises a plurality of planar elastic members and plurality of longitudinal elastic members disposed between the plurality of planar elastic members. A first end of each of the plurality of planar elastic members is mechanically coupled to at least one of the plurality of planar elastic members. A second end of each of the plurality of longitudinal elastic members is mechanically coupled to the housing. | 08-13-2015 |
Patent application number | Description | Published |
20140376540 | Frequency-Domain Symbol And Frame Synchronization In Multi-Carrier Systems - Methods and systems are disclosed for frequency-domain symbol and frame synchronization for multi-carrier communication systems. Received signals are sampled and converted into frequency components associated with subcarriers within the multi-carrier communication signals. Symbol synchronization is performed in the frequency domain by performing correlation(s) between frequency components of the received signal and frequency-domain synchronization symbol(s). After symbol synchronization, frame synchronization correlation is also performed in the frequency domain between frequency components of the received signal and frequency-domain synchronization symbol(s). The disclosed embodiments are particularly useful for symbol and frame synchronization in multi-carrier received signals for power line communication (PLC) systems and/or other harsh noisy communication environments. | 12-25-2014 |
20140376648 | Frequency-Domain Amplitude Normalization For Symbol Correlation In Multi-Carrier Systems - Methods and systems are disclosed for frequency-domain amplitude normalization for symbol correlation in multi-carrier communication systems. Digital samples associated with input signals received from a communication medium are processed using a Fast Fourier Transform (FFT) to generate complex frequency components. Each complex frequency component is normalized with respect to its amplitude, and the frequency-domain, amplitude-normalized frequency components are multiplied with frequency components for reference symbol(s) to generate frequency-domain correlation values. These frequency-domain correlation values are analyzed to determine if a correlation exists between the amplitude-normalized frequency components and the predetermined reference frequency components. A correlation detection output is then generated that indicates whether or not a symbol synchronization was achieved. The disclosed embodiments are particularly useful for symbol correlation in received signals for power line communication (PLC) systems. | 12-25-2014 |
20140376667 | Frequency-Domain Carrier Blanking For Multi-Carrier Systems - Methods and systems are disclosed for frequency-domain carrier blanking in multi-carrier communication systems. When excessive energy is detected in one or more subcarriers within a received symbol for multi-carrier communications, those subcarriers are blanked for subsequent demodulation in order to avoid corruption of the demodulated data. A conversion from time-domain digital samples to frequency-domain values using an FFT (Fast Fourier Transform) and a threshold detector are utilized to detect corrupted subcarriers. Further, this frequency-domain carrier blanking can be implemented dynamically on a symbol-by-symbol basis to further improve demodulation performance by reducing decoding errors. The disclosed embodiments are particularly useful for improving demodulation performance in power line communication (PLC) systems. | 12-25-2014 |
20140376674 | Frequency-Domain Frame Synchronization In Multi-Carrier Systems - Methods and systems are disclosed for frequency-domain frame synchronization for multi-carrier communication systems. Received signals are sampled and converted into frequency domain components associated with subcarriers within the multi-carrier communication signals. A sliding-window correlation (e.g., two-dimensional sliding window) is applied to the received symbols represented in the frequency domain to detect frame boundaries for multi-carrier signals. The sliding-window frame synchronization can be applied by itself or can be applied in combination with one or more additional frame synchronization stages. The disclosed embodiments are particularly useful for frame synchronization of multi-carrier signals in PLC (power line communication) systems. | 12-25-2014 |
20150098514 | Techniques for Generating Bit Log-Likelihood Ratios in Communication Systems Using Differential Modulation - A technique for generating a bit log-likelihood ratio (LLR) in a communication system includes generating a demodulated signal based on a received symbol and a reference symbol. An input for a bit LLR generator is generated based on the demodulated signal and a normalization value that is based on the received symbol or the reference symbol. A bit LLR is generated for the received symbol, using the bit LLR generator, based on the input. | 04-09-2015 |
20150098530 | Detecting Repeated Preamble Symbols Using Over-Sized Discrete Fourier Transforms - A technique for detecting symbols includes performing an over-sized discrete Fourier transform (DFT) operation on a received signal that includes at least two repeated symbols. A sum of signal characteristics for subcarriers of one or more possible symbols are determined based on the DFT operation. A sum of signal characteristics for non-subcarriers of the one or more possible symbols is determined based on the DFT operation. Finally, a determination is made as to whether one or more of the one or more possible symbols is detected based on the sum of signal characteristics for the subcarriers and sum of signal characteristics for the non-subcarriers. | 04-09-2015 |