PROFESSIONAL ENGLISH UNIT3 FUEL INJECTION SYSTEMS TEXT B Functions of the Motronic Systems
UNIT3 FUEL INJECTION SYSTEMS TEXT B Functions of the Motronic Systems PROFESSIONAL ENGLISH
本次课学习内容 UNIT 3 FUEL INJECTION SYSTEMS TEXT B Functions of the Motronic Systems Ignition Timing Control Control unit ●Dwe- Angle Control Idle Speed Control
UNIT 3 FUEL INJECTION SYSTEMS TEXT B Functions of the Motronic Systems • Ignition Timing Control • Control Unit • Dwell-Angle Control • Idle Speed Control 本次课学习内容
本次课学习目标 ●掌握 Motronic系统的主要功能及其作用原 理 掌握常用术语 了解相关术语 ●提高翻译能力
本次课学习目标 ⚫ 掌握Motronic系统的主要功能及其作用原 理 ⚫ 掌握常用术语 ⚫ 了解相关术语 ⚫ 提高翻译能力
NEW WORDS coordinate [kou'。: dineit] v.调整,整理 model『'md]n模型,典型,圆形,车型;v模拟 troubleshoot ['trablju:v排除故障 condenser [ken' densa]n冷凝器,电容器 patch[paet∫]v修补,补缀 interpolate[inte: poulet] v窜改 fall-off [f:l-fn衰退,减少,逐渐下降 conserve[kan'se:vv保存,保藏,守恒
NEW WORDS coordinate [kou'ɔ:dineit] v.调整，整理 model ['mɔdl] n.模型，典型，圆形，车型；v.模拟 troubleshoot ['trʌbl∫u:t] v. 排除故障 condenser [kən'densə] n.冷凝器，电容器 patch [pæt∫] v.修补，补缀 interpolate [in'tə:pouleit] v.窜改 fall-off [fɔ:l-ɔf] n.衰退，减少，逐渐下降 conserve [kən'sə:v] v.保存，保藏，守恒
PHRASES AND EXPRESSIONS dwell time闭合时间,初级电路接通时间 short of缺乏,缺少,不够.(标准) at the moment of在…一刻,当.时 idle- speed contro怠速控制 be derived from由.得来,来源于 all the while一直,始终 lambda closed- cloop controλ闭环控制 idle- speed stabilizer怠速稳定器
dwell time 闭合时间，初级电路接通时间 short of 缺乏，缺少，不够…（标准） at the moment of 在…一刻，当…时 idle-speed control 怠速控制 be derived from 由…得来，来源于 all the while 一直，始终 lambda closed-loop control λ闭环控制 idle-speed stabilizer 怠速稳定器 PHRASES AND EXPRESSIONS
Functions of the Motronic Systems In simple terms, Motronic is an engine-management system with a single control unit for control of ignition timing as well as fuel-injection. Many of the sensors important for fuel injection are also needed for ignition-system control, so the integration of the two systems can accomplish many things ntegrated control of fuel injection and ignition can manage the engine better than control of either one alone. That is timing is sometimes dependent on the air-fuel ratio, and vice versa; also, emissions can be reduced by coordinated control Engine control can be based on actual needs of each engine model based on large amounts of engine-test data during different operating conditions stored in the Motronic Read Only Memory(ROM)[ [1]根据 Motronic系统的只读存储器(RoM)中所存储的大量试验数据,就能够按照每 个发动机机型的实际需要,对发动机进行控制。 Motronic系统的只读存储器(ROM中 所存储的这些试验数据是在发动机不同工况期间通过试验而得到的
Functions of the Motronic Systems In simple terms, Motronic is an engine-management system with a single control unit for control of ignition timing as well as fuel-injection. Many of the sensors important for fuel injection are also needed for ignition-system control, so the integration of the two systems can accomplish many things: · Integrated control of fuel injection and ignition can manage the engine better than control of either one alone. That is, timing is sometimes dependent on the air-fuel ratio, and vice versa; also, emissions can be reduced by coordinated control. · Engine control can be based on actual needs of each engine model based on large amounts of engine-test data during different operating conditions stored in the Motronic Read Only Memory (ROM)[1] [1] 根据Motronic系统的只读存储器（ROM）中所存储的大量试验数据，就能够按照每 个发动机机型的实际需要，对发动机进行控制。Motronic系统的只读存储器（ROM）中 所存储的这些试验数据是在发动机不同工况期间通过试验而得到的
Many additional operating functions can be provided Important from the standpoint of service are the adaptive functions, and the self-diagnostics for troubleshooting Motronic advantages are better driveability and fuel efficiency, and reduced emissions. More specific benefits a fuel savings achieved from best combination of mixture and timing b dependable starting, cold or hot C stable idling at reduced rpm e relative freedom from maintenance f. good torque characteristics, allowing longer gear ratios
· Many additional operating functions can be provided. Important from the standpoint of service are the adaptive functions, and the self-diagnostics for troubleshooting · Motronic advantages are better driveability and fuel efficiency, and reduced emissions. More specific benefits: a. fuel savings achieved from best combination of mixture and timing b. dependable starting, cold or hot c. stable idling at reduced rpm e. relative freedom from maintenance f. good torque characteristics, allowing longer gear ratios
Ignition Timing Control I'm talking here about more than electronic ignition -the systems that have replaced the points and condensers of yesterday. I'm talking about microcomputer control of ignition advance angle for every plug firing or at most, every two plug firings. The millisecond response time of electronic ignition advance control is far faster than the traditional mechanical flyweight/vacuum advance systems In a mechanical system(and that includes electronic ignition), as rpm increases, centrifugal weights advance timing. Changing load (manifold pressure)can further change timing advance with a vacuum diaphragm As rpm increases, there is less dwell time for the coil to charge when perhaps the engine needs more spark energy Traditional curves for distributor timing show the limited control of timing advance possible. a timing point that is proper for one combination of rpm and load is probably wrong for other combinations of centrifugal weight position and vacuum diaphragm action. Once the vacuum control or the centrifugal weights reach their limits advance control is fixed
Ignition Timing Control I'm talking here about more than electronic ignition-the systems that have replaced the points and condensers of yesterday. I'm talking about microcomputer control of ignition advance angle for every plug firing, or at most, every two plug firings. The millisecond response time of electronic ignition advance control is far faster than the traditional mechanical flyweight/vacuum advance systems. In a mechanical system (and that includes electronic ignition), as rpm increases, centrifugal weights advance timing. Changing load (manifold pressure) can further change timing advance with a vacuum diaphragm. As rpm increases, there is less dwell time for the coil to charge when perhaps the engine needs more spark energy. Traditional curves for distributor timing show the limited control of timing advance possible. A timing point that is proper for one combination of rpm and load is probably wrong for other combinations of centrifugal weight position and vacuum diaphragm action. Once the vacuum control or the centrifugal weights reach their limits, advance control is fixed
Mechanical timing has been patched with more vacuum hoses temperature and delay valves, and other servicing headaches it's still a compromise. Even at its best, this control fails far short of the precise and rapid timing needed by today s cars In Motronic systems, however, the control unit processes a number of inputs, and then adjusts timing for all conditions based on its internal data map Timing Data "Maps To determine precise timing-advance requirements, each family of engines is tested to learn the best timing for each condition of speed, load, and other variables in heat and cold on the dynamometer and in the mountains. The goal is to find the timing for best power, for best economy, all the while meeting emission limits
Mechanical timing has been patched with more vacuum hoses, temperature and delay valves, and other servicing headaches; it's still a compromise. Even at its best, this control fails far short of the precise and rapid timing needed by today's cars. In Motronic systems, however, the control unit processes a number of inputs, and then adjusts timing for all conditions based on its internal data map. Timing Data "Maps" To determine precise timing-advance requirements, each family of engines is tested to learn the best timing for each condition of speed, load, and other variables in heat and cold, on the dynamometer and in the mountains. The goal is to find the timing for best power, for best economy, all the while meeting emission limits
lgnition advance -Engine load (air-flow sensor or air-mass sensor Fig 3-3 Ignition advance map shows electronic timing control according to engine load and speed. The maps are symbolic of thousands of data points stored in control unit memory
Fig. 3-3 Ignition advance map shows electronic timing control according to engine load and speed. The maps are symbolic of thousands of data points stored in control unit memory