3 results about "Compression ratio" patented technology

The invention discloses a method and equipment for data transmission. The method includes: in the uplink direction, subjecting an uplink signal to down-sampling by an RRU (radio remote unit) according to a P/Q ratio to obtain an uplink signal with a second sampling rate, subjecting the down-sampled uplink signal to quantization compressing according to a preset compression ratio, sending the uplink signal subjected to quantization compressing to a BBU (baseband unit), and using the BBU for quantization decompressing of the uplink signal subjected to quantization compressing; and in the downlink direction, using the BBU for quantization compressing of a downlink signal with the second sampling rate according to the compression ratio, sending the downlink signal subjected to quantization compressing to the RRU, using the RRU for quantization decompressing of the downlink signal subjected to quantization compressing, and subjecting the downlink signal after quantization decompressing to up-sampling according to a Q/P ratio. By means of combination of down-sampling and quantization compressing, the volume of data transmitted through an interface Ir is effectively compressed.

The invention discloses a forming method of a scraper ring flat steel belt used for a piston ring. The forming method is characterized in that a qualified round steel wire with the sectional area close to that of the finished-product flat steel belt serves as a raw material. Firstly, through primary rolling of a two-roller mill, a primarily-rolled flat steel belt in the required size is acquired, the compression ratio is controlled to be 60-90%, a left roller and a right roller are each provided with a belt groove four-roller mill of grooves matched with the R-arc shape required by the two sides of the scraper ring flat steel belt used for the machined piston ring to perform multi-pass rolling so that size control and two-side R arc trimming can be achieved, and in order to acquire the finished-product flat steel belt in the required shape and size, each-pass compression rate is controlled to be 3-5%. The forming method can be used for efficiently producing the good-quality flat steel belt for the piston ring. The cross-section shape, the size precision, the cleaning rod performance and the production efficiency of the produced scraper ring flat steel belt are all remarkably improved, and production cost is much lower than that of steel belts produced through a special-shaped wire-drawing die and a splitting treatment forming method.

The invention provides a direct injection engine and a combustion forming method thereof. The method includes the steps of S1, injecting gasoline fuel into a combustion chamber in a compression stroke twice to form a first fuel mixture gas region, a second fuel mixture gas region and an air region in the combustion chamber from inside to outside, wherein the excess air coefficient of the first fuel mixture gas region is less than that of the second fuel mixture gas region; S2, compressing the gas in the combustion chamber to enable the gas in the first fuel mixture gas region to spontaneously combust. According to the direct injection engine and the combustion forming method thereof, the way of injecting gasoline fuel into the combustion chamber in the compression stroke twice is used for forming compression ignition three-region mixture gas layered in the combustion chamber, and a cylinder of ultra-high compression ratio is used for enabling the gas in the first fuel mixture gas region to be in a spontaneous combustion critical state, so that the efficient and clean combustion with ultra-high compression ratio, ultra-lean-burn, anti-knock performance and low heat dissipation can be achieved.