61 results about "Rate shaping" patented technology

A very high speed injector permits injecting high pressure diesel oil directly into a diesel engine combustion chamber. The very high speed permits almost arbitrary rate shaping, minimizing formation of diesel particulate matter and oxides of nitrogen pollutants. An electrical waveform is pre-determined for a desired fuel injection rate shape. The electrical waveform is converted into a corresponding magnetic field waveform by a solenoid coil. A giant magnetostrictive material (GMM) transduces the magnetic field waveform into a corresponding mechanical waveform. The mechanical waveform positions a valve element to control flow rate. The very high speed features include a thin solenoid coil of relatively few turns, proportionally supplying up to one hundred amperes at up to one hundred volts in no greater than ten microseconds, the GMM is subject to a bias compressive stress magnitude of no less than fourteen megapascals, and the magnetic flux path is minimized and designed to suppress eddy currents.

According to the present invention, methods and apparatus are provided to improve the Transmission Control Protocol (TCP) for data such as delay sensitive or bursty data. A maximum send window is adjusted using forward queuing delay and maximum bandwidth parameters. Reverse queuing delay and the number of packets drops are not factored into generation of the maximum send window. Network buffer occupation is bounded and a congestion window is effectively varied using rate shaping and gradual size increases based at least partially on the number acknowledged packets.

In some fuel injectors, a variable flow rate valve is used to control actuation fluid flow rates to and from an intensifier piston. Over time, the variable flow rate valve is subjected to wear that can affect the predictability of the injection rate shape. The present invention reduces variable flow rate valve wear within a fuel injector, at least in part, by guiding a variable flow rate valve member along guide bore walls within a rate shaping path. The rate shaping path and an unrestricted path are defined by an injector body. When in a retracted position, a moveable intensifier piston includes a first hydraulic surface that is exposed to hydraulic pressure in the unrestricted path and a second hydraulic surface that is exposed to hydraulic pressure in the rate shaping path. The variable flow rate valve member defines a central passage with a predetermined flow area and includes a side surface that separates a closing hydraulic surface from an opening hydraulic surface. The side surface includes a plurality of guide surfaces that separate peripheral flow passages.