4347 results about "Multiple stages" patented technology

A circuit for adding or subtracting an amount of charge from a charge sample, such as in a Charge Coupled Device (CCD), by portioning and pipelining the processing stages, to avoid introducing a memory effect. The operation, such as subtraction, is split into multiple stages, with each stage responsible for removing only a portion of the total amount of charge that is desired to be removed. The subtraction pipeline stages operate together to remove the total desired charge amount. In one embodiment each successive subtraction stage removes a corresponding lesser amount of charge. As a result, greater accuracy in the amount of charge removed is achieved as well operation at higher frequencies than previous charge subtraction approaches.

The invention relates to a hidden turnover ladder. The hidden turnover ladder is characterized by comprising an upper ladder assembly and a lower ladder assembly, wherein the upper ladder assembly comprises a baseplate, and a pair of mounting vertical plates symmetrically arranged on the baseplate; multiple stages of upper antiskid pedals are arranged between the mounting vertical plate; first pin shaft holes are formed in the lower front parts of the mounting vertical plates; the lower ladder assembly comprises a pair of step type mounting side plates; connecting lug plates are arranged at the upper ends of the mounting side plates, and are rotationally connected with the first pin shaft holes through first pin shafts; and multiple stages of lower antiskid pedals are arranged between the mounting side plates. The hidden turnover ladder has the beneficial effects of less occupied space, convenience for use and folding capacity in no use. The invention further discloses oil field operation equipment adopting the turnover ladder; and the oil field operation equipment has the following beneficial effects: second pin shafts are arranged for connecting a car body with the hidden turnover ladder, so that the turnover ladder can be accommodated in a turnover ladder accommodating cavity after two times of overturning, and the effect of convenience for use and transportation is achieved.

Improved transient response times are obtained while maintaining low emissions with a low pressure EGR system through methods for quickly obtaining a desired oxygen concentration for charge-air to be used for combustion. Under a first method, fuel quantity in the main combustion event is controlled in the combustion process to produce exhaust around a relatively constant target exhaust oxygen concentration value. By keeping the exhaust oxygen concentration levels at a relatively constant value, lag time in waiting for low pressure EGR valve adjustments during transients may be avoided, and the system's air handling response to meet transients may be paced solely by adjusting the mass of air to be supplied (i.e. boost response). Under a second method, a multiple-stage combustion process is utilized, in which fuel feed is controlled in a small, preliminary HCCI-type combustion event in order to produce a target oxygen concentration of charge-air to be used for the second, main combustion event. Under a third method, exhaust rebreathing is used to produce a target oxygen concentration of charge-air to be used for combustion.