The first domestic counterparts to launch the country 4, the 5th machine, Yuchai has been the first-mover advantage to win the attention of the industry and users respected. In the field of passenger vehicles, Yuchai Heavy Machines has always been the first choice for passenger car product upgrades. It has not only repeatedly served in the challenging reception of the “two sessions†in the country, but has also been listed as a dedicated engine for the Beijing Olympic Games reception car; Yuchai heavy machine also attracted a group of users who favor electric control heavy truck with excellent performance.
Thick and thin
To trace the source, Yuchai assumed the “Ninth Five-Year Plan†research project of the State Science and Technology Commission in 1995, “R&D of electronically controlled inline pump-pipe-valve-billed (PPVI) engineâ€; in 1999, it began research and development of electronically controlled high pressure common-rail engine; Start dual-fuel engine development project. The three major projects have injected necessary new technologies and new forces for the successful development of Yuchai's electronically controlled engines, and have also laid the foundation for Yuchai's advanced technology.
Yuchai's YC6MK, YC6M, YC6L, and YC6A series of heavy-duty electronically controlled engines are mainstream products, integrating advanced technologies such as four-valve and in-cylinder braking. Among them, perfect electronic control system integration technology is a distinctive feature of Yuchai products. Yuchai's electronic control systems include electronically controlled common rail systems, electronically controlled monomer pump systems, electronically controlled in-line pump systems, and electronically controlled gas systems. The simultaneous application of a variety of electronic control technologies has enriched Yuchai's product line. Yuchai's engine can achieve high-pressure injection over the entire engine speed range. It can complete three stages of pre-injection, main-injection and post-injection fuel injection in the cycle, and even multi-phase injection; the ECU computer can flexibly and precisely control the amount of oil used. And injection time, can reduce the diesel PM (particles) and NOx (nitrogen oxides), while ensuring excellent power performance and fuel economy.
Yuchai's electronically controlled engine also has idle speed closed-loop control, starting torque compensation control, deceleration and cut-off oil control, cylinder balance control, engine protection control, noise control, vehicle communication control, powertrain (automatic transmission, ABS, etc.) ) Joint control, door safety control, power output (PTO) control, fault diagnosis and other functions have achieved historic breakthroughs in many aspects such as fuel economy, environmental protection, comfort, and safety.
Combination attack
For heavy truck manufacturers. Yuchai YC6MK, YC6M, YC6L, YC6A and other 4 heavy-duty machines can achieve a reasonable match of "quantitative position". 10.3 liters of YC6MK and 9.8 liters of YC6M have advantages of large displacement and strong power, and are suitable for heavy tonnage heavy trucks such as 6×4 tractors, 8×4 and 6×4 dump trucks, and 8×4 and 6×4 cement mixers; YC6L and YC6A have the advantages of light weight, low fuel consumption and low maintenance cost. They are equipped with medium and low tonnage heavy trucks, and are beneficial to reduce their operating costs; 8.4 liters of YC6L cover 260 to 330 horsepower, fit 6×2 tractor, 8× 4 trucks and other medium-tonnage highway heavy trucks, 7.2 liters of YC6A cover 240 to 280 horsepower, adapted to 4 × 2 tractors, 8 × 4 trucks and other low-tonnage highway heavy trucks.
Yuchai has developed a heavy duty electronically controlled engine that has a total capacity of more than 1,000 units. Recently, at the 2008 Yuchai Gas Engine Customer Exchange Conference, a YC6M four-valve gas electronically controlled engine was demonstrated. Wu Qiwei, deputy general manager of Yuchai Machinery Co., Ltd. introduced that the YC6M has 290, 310, and 340 hp three power segment models, adopts advanced four-valve technology and electric control technology, and has obvious advantages of low gas consumption, and emissions are met. National III emission standards. At present, YC6M has been exported in small quantities, and two domestic heavy-duty truck companies will also launch heavy trucks equipped with this engine in batches. Under the background of rising oil prices and frequent oil shortages, Yuchai's heavy-duty electronically controlled engines are gradually blooming their unique charm.
View related topics: Yuchai won the "China Brand Annual Award NO.1" (internal combustion engine) title in 2007
Turfgrass includes many varieties: such as bluegrass, evergreen, cold-season, mixed-crop lawns, etc., and each turfgrass contains hundreds of turfgrass varieties. Among them, the most common is bluegrass, bluegrass Is the most used in the greening industry
Turfgrasses are mostly grasses and they have the following common characteristics:
1. The lawn leaves are many and small, slender and mostly upright. Most turfgrasses are vegetative and vigorous, and vegetative bodies are mainly composed of leaves. The thin and dense leaves are good for forming a carpet-like lawn, and the upright and small leaves are good for the light to transmit to the lower leaves of the lawn. Therefore, the yellow leaves and the dead leaves rarely occur at high density.
2. The green of turfgrass is one of the most important characteristics of turfgrass. Good turfgrass should have verdant green foliage, uniform green, and long green period. Generally, the green period of excellent cold-season turfgrasses is more than 200 days, and the green period of excellent warm-season turfgrasses is more than 250 days.
3. The growth point of the upper part of the lawn is low, and there are multiple protections of tough leaf sheaths. Such pruning, rolling, and trample will cause less harm to the lawn grass, facilitate the growth of branches and adventitious roots, and be beneficial to wintering.
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5 Turfgrass has strong adaptability, wide distribution range, and good resistance to stress. Many varieties have strong adaptability to unhealthy environments such as cold, drought, strong light, hot, acid and alkali, trample, and pollution, and are easy to manage.
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