fadec全權(quán)限數(shù)字式電子控制-wenkub.com
2025-04-26 05:31 本頁(yè)面
【正文】 盡管出現(xiàn)了諸多的 先進(jìn)控制 、 主動(dòng)控制 等概念，但要解決的主要技術(shù)問(wèn)題不外乎美國(guó)高性能渦輪發(fā)動(dòng)機(jī)綜合技術(shù)（ IHPTET）計(jì)劃中歸納的三個(gè)方面，即：增加控制性能；減輕重量；提高對(duì)不利環(huán)境的容限。所有的傳感器和作動(dòng)器都需要某種形式的補(bǔ)償，即它們自己的控制系統(tǒng)。 ? 除了降低發(fā)動(dòng)機(jī)控制系統(tǒng)的復(fù)雜性和重量之外，分布式控制系統(tǒng)的優(yōu)點(diǎn)還有：由于采用通用模塊和標(biāo)準(zhǔn)接口，縮短了研制周期和降低了成本（ 60%）；通過(guò)對(duì)每個(gè)靈巧裝置進(jìn)行自檢和診斷，降低了維修成本；采用新的元件級(jí)技術(shù)，對(duì)中央處理計(jì)算機(jī)的改動(dòng)最小甚至無(wú)需改動(dòng)，設(shè)計(jì)和升級(jí)的靈活性大； FADEC可以遠(yuǎn)離發(fā)動(dòng)機(jī)安裝，進(jìn)一步降低重量，改善可靠性和控制系統(tǒng)的總和。 ? 在分布式控制系統(tǒng)中，靈巧裝置通過(guò)一條余度的高速數(shù)字?jǐn)?shù)據(jù)總線和 FADEC通信。 4 ECU cont’d ? Control channel will receive the sensor inputs and monitor any changes ? Control channel will use these inputs to precisely trim the fuel to air ratio going into each cylinder ? Therefore, the control channels allow each cylinder to be individually leaned or enriched ECU cont’d ? If one control channel fails within an ECU the other control channel can operate it’s assigned cylinder as well as the opposing cylinder as backup control for fuel injection and ignition timing ? All critical sensors are redundant with one sensor from each type connected to a control channel in different ECUs ? Synthetic software default values are also used should both sensors of a redundant pair fail… therefore, FADEC will always have a value to work off of so it can inject an average amount of fuel to the cylinder Health Status Annunciator (HSA) HSA cont’d ? Consists of (5) lights on panel and WOT ? HSA provides information regarding the status of the FADEC system ? We have the 2light system display referenced in the manual plus additional indicators as seen on the HSA ? HSA will not give you a warning or caution light for OIL temp/pressure or ALT FAIL HSA lights ? FADEC WARN: Engine Failure may be imminent, more than (1) cylinder is affected… land ASAP ? FADEC CAUTION: % of installed ponents are working. No immediate action is req’d. Most mon example is a bad EGT sensor… all sensors are redundant ? ANYTIME YOU GET A WARNING OR CAUTION REFER TO VM1000… this is a window into what FADEC sees HSA lights cont’d ? PPWR FAIL: Primary Battery is not being charged, will be acpanied by EBAT FAIL… you will start draining both batteries and have at least 60 minutes to land. Your secondary battery will only power FADEC, AI, and Turn Coordinator ? EBAT FAIL: Backup Battery not being charged, everything can run from Primary Power Source/Battery HSA Lights cont’d ? FUEL PUMP: illuminates when Fuel Boost Pump Mode Switch is in ON or OFF. If this light is illuminated it means that you are manually controlling the fuel pump or that the fuel pressure is out of the 2040 psi range. Illuminates for electric driven fuel pump as well as engine driven pump ? WOT: below HSA panel. Illuminates when Throttle Position Switch (TPS) is contacted (full throttle), signal sent to ECU that max power is req’d which causes FADEC to set fuel to air ratio for Best Power FADEC Ignition System ? Consists of high voltage harness and spark plugs (2 plugs per cylinder) ? Employs a waste spark ignition system plugs fire once on pression and once on exhaust... this keeps plugs clean ? ECU1 fires top and bottom spark plugs for cylinders 1 amp。后者從 4月開(kāi)始，初始設(shè)計(jì)評(píng)審在 8月進(jìn)行，關(guān)鍵設(shè)計(jì)評(píng)審在
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