Electronic Control Unit And Engine Management System Engineering Essay

Electronic Control Unit And Engine Management System Engineering Essay Ever since we have established RHR Engineering workshop, we have carried out several ECU (Electronic Control Unit) mapping. Keeping this in mind, I have decided to make a report on ECU, and its operation for our technicians. This report will instruct our technicians on ECU operation, function, features, and its principles. P1 The ECU (Electronic Control Unit) or otherwise known as Engine Management System is a computer which controls every action and reaction of the Engine. The ECU consists of an 8-32bit microprocessor, Random Access Memory (RAM), Read Only Memory (ROM), and an Input/Output interface, Analogue Digital converters and in some cases Electronic Erasable Programmable Read Only Memory (EEPROM). Random Access Memory (RAM) is a flash memory, which is erased once the car is switched off. It provides the ECU with the data which is needed at the moment of operation. Whereas, Read Only Memory (ROM) is permanent memory, therefore it is non-erasable. It stores all the functions, and module of the operating systems e.g. Ignition Timing, Injection Timing. EEPROM is a sophisticated type of memory, which could be found in Aftermarket, and High Valued vehicles. The Function remains the same as ROM, but the function module could be edited or erased by the driver according to his/her desire, via sending comm ands through on dash buttons or by connecting a Computer to the ECU (only in case of Aftermarket ECU). EEPROM provides the driver with choice of driving style, performance output, and handling characteristics. Analogue digital converters are used to converts digital signals into analogue signals and vice versa. For example, speed sensors convert digital signal into analogue signal i.e. Speed gauge. gsensorinstall The ECU controls almost all the running gear of the vehicle. The main operating system, which ECU has to control in order to run the engine, is the Fuel Injection System, Ignition Timing, and the Idle Speed Control system. Based on information from the input sensors (engine coolant temperature sensor, Manifold Absolute Pressure sensor, Air Flow sensor etc.), the ECU determines optimum settings for the output actuators (Injectors, Idle Speed Control Valve etc.). Modern day Vehicles are equipped with sophisticated ECUs. They have several other features such as, Traction Control, Cruise Control, Active Suspension, Electronic Ignition System, Variable Valve Timing activator, and ABS (Anti-Lock Brake System). They also work as diagnostic software, as it houses several Sensors and Actuators around the vehicle. The ECU operates on information sent by the sensors. If any correction is to be made, or if any function needs to be carried out, it does it using actuators. Input signal are received by the sensors and output signals are given to the actuators. All the information is processed in digital format. Motronic_english The main function of the ECU is to carry out checks to ensure correct running of the engine. The most common checks are as follows: Fuel injection: Ignition timing Idle Emission control These checks are necessary so that the vehicle will meet the emission standards, maintain fuel economy, and be reliable. P2 The input signals received by the ECU are sent by the Sensors. The sensors act as a stimulus of the ECU. The 3 most commonly found Sensors are described as follows: 1) Air mass meter: There are 2 types of air mass meter, hot wire type, and vane type. They both serve the same function, although the material used is different. An air mass meter is located after the air filter and before the intake plenum. The air mass meter provides the ECU with an analogue signal that indicates the amount of air being drawn into the engine. The ECU then takes this value to add the correct amount of fuel to maintain the 14.7:1, air: fuel ratio. ford_probe_air_mass_meter The most common type of air mass meter is the HOT Wire type air mass meter. It is mainly used in multi-point injector system. It uses an electrified wire, which acts as a resistor. During operation the wire is heated, but when the air passes over the heated wire, it cools, thus changing the resistance. The ECU monitors the resistance value and can work out how much air is entering the engine. AirMassMeterWire 2) Oxygen/ Lambda Sensor: The main function of the oxygen sensor is to measure the amount of oxygen content exiting the exhaust. It also serves the purpose to ensure that the air/fuel mixture is chemically correct. An oxygen sensor is fitted between the exhaust manifold and the catalyst converter. oxygen_sensor_1 sensor4 Oxygen sensor has to heat up to approx 350 degrees Celsius to work properly. They send a signal to the ECU via voltage to enable the ECU to maintain, or to correct the air/ fuel ratio. The ceramic tip on the end of the oxygen sensor that protrudes into the exhaust manifold becomes porous and allows the oxygen ions to flow through the tip. This creates the signal voltage, which changes with change in oxygen level inside the exhaust. This signal is therefore transmitted to the fuel injection or to the ECU, which alters the fuel quantity as necessary, until the oxygen content of the exhaust gas is correct for efficient catalytic converter operation, and to maintain fuel economy. 3) Throttle position sensor: It detects the position of the throttle plate. The ECU maintains the engine idle speed at a given value e.g. 800 revs per minute. The ECU identifies when the engine is at idle from the information supplied by the throttle position sensor. T-BodySm The throttle position sensor incorporates a potentiometer. The wiper of the potentiometer is connected to the throttle plate, so that as the throttle is moved from the closed, to wide-open, the voltage signal from the sensor changes. The voltage signal is passed to the ECU, and used to determine the exact position of the throttle, and the rate at which the throttle is being opened and closed. It helps the ECU to access driverà ¢Ãƒ ¢Ã¢â‚¬Å¡Ã‚ ¬Ãƒ ¢Ã¢â‚¬Å¾Ã‚ ¢s intensions, such as the intention to rapidly accelerate, by detecting the speed or the rate at which the throttle is being opened. P3 The output signal from the ECU is received by the Actuators. An actuator is a mechanical device which transforms electrical signal into kinetic / mechanical energy. E.g. Injectors, Fuel Pump, idle speed control valve. There are 3 types of actuators, Solenoid type e.g. Injector, EGR (Exhaust Gas Recirculation Valve) Valve, Stepper Motor type e.g. Idle Speed Control Valve, and a DC (Direct Current) Motor type e.g. Fuel Pump. solenoid The Solenoid type actuator uses a coil of wire around a soft metal, through which when the current passes it produces a magnetic field. This magnetic field is used to convert electrical energy into mechanical energy (linear motion) e.g. Injector Injector: fuelinjector The function of the injector is to deliver a finely atomized spray of fuel to the inlet manifold or the cylinder head. It is located on the inlet manifold after the throttle body. injector solenoid off The injector solenoid is connected directly to the battery via a relay; the earth circuit for the injector is connected to the ECU. When the ECU completes the earth circuit the injector circuit is completed. Once the injector circuit is completed, the current is passed to the solenoid (electromagnetic Coil); this in turn produces magnetic energy, and attracts the plunger (needle valve), thus opening the diffuser nozzle, and delivering fuel to the inlet manifold or the combustion chamber. injector solenoid on A DC (Direct Current) Motor coverts electrical energy into mechanical energy (rotary motion). The most common example of DC motor type actuator is Fuel Pump. motor The DC motor works by electromagnetism. The magnetic force acts perpendicular to both wire and magnetic field. When electric current passes through a coil in a magnetic field, the magnetic force produces torque which turns the DC motor. Fuel Pump: The fuel pump supplies the injector with adequate fuel at a sufficient pressure to allow the injectors to give good atomization. In modern day vehicles it is located inside the fuel tank, in order to keep the pump cool, and reduce the noise of operation. Electric_Fuel_Pump Unlike the Stepper Motor, the fuel pump runs on a DC (Direct Current) Motor, therefore it has a continuous operation, and earth connection. Modern day vehicle are fitted with High Pressure Roller- Cell type fuel pumps. The Roller cell Pump is an example of DC motor, as it converts electrical energy into mechanical energy (rotary motion). When the fuel enters the pump it is compressed by rotating cells which force it through the pump at a high pressure. efi_1-0 The pump can produce a pressure of 8 bar (120 psi. Within the pump is a pressure limiting valve, which maintain the pressure through the fuel pump. The other end of the pump (output) is home to a non-return valve which, when the voltage to the pump is removed, it closes the return to the tank, and maintains pressure within the system. The normal operating pressure within this system is approximately 2 bar (30 psi), at which the current draw on the pump is 3 to 5 amps. Stepper Motor is an analogue actuator. They are used to convert electrical energy into mechanical energy (rotational movement). Unlike a conventional motor, a stepper motor will rotate but in stages and not full rotations, therefore it can open and close airways partially. step-rot The most common type of stepper motor actuator is an Idle Speed Control Valve. Idle Speed Control Valve (ISCV): The Idle Speed Control Valve is used to either regulate the bypass of air around the throttle butterfly or as a throttle motor controlling the position of the throttle butterfly. The ECU constantly alters the control signal to the motor or valve to maintain a constant idle speed. T-BodySm In an idle speed control valve, a stepper motor is built into the ISCV where it rotates a valve shaft either in or out. This in turn increases or decreases the clearance between the valve and the valve seat, therefore regulating the amount of air allowed to pass through thus controlling the idle. The idle increases when the Air Condition is switched on, this is because of the load on engine received by Air Condition. M2 Performance of the sensors depends on their location. A hot wire air mass meter will not perform well if it was placed above the exhaust manifold, as it will heat the wire, and give false reading of air drawn in. This error will result in incorrect air/fuel mixture, high engine temperature, and producing far more emissions. An oxygen sensor will perform best at approximately 350 °C. the operating temperature of the sensor is affected by the location in the exhaust: too close to the exhaust manifold can lead to overheating, this will result in burning the heating element or the filaments inside thus emitting harmful gases (CO, HC) in the atmosphere, too far from the exhaust manifold and the sensor may not reach its correct operating temperature, this will result in emitting harmful gases (CO, HC) in the atmosphere. gsensorboard The location of the ECU also matters. Keeping the ECU in the engine bay can overheat the processor inside the ECU causing delays in input and output signals. The best location for the ECU is under the Passenger compartment, this will keep the temperature low, and it is beneficial for the micro processor to perform its task well. M1 Earlier example of ECU were not as sophisticated as modern ECU. Older ECUs were used on Single Point Injector system. They were simpler than the modern day ECU, as it used fewer components, and had less function to carry out. 10 Single Point injection ECU had to only carry out fuel injection; it still used the conventional ignition system, and had very few sensors, and actuators. Against the modern day ECU it has few advantages and disadvantages. Advantages Disadvantages Fewer components therefore cutting cost Less control over the engine Less components to go wrong Manual diagnostic Fuel is well atomized Inappropriate fuel distribution Having less components means it had less control over correct running of the engine, and meeting the emission standards. This major disadvantage lead to the development of a much sophisticated ECU which could be found in modern day vehicle e.g. Multi-Point Injection System. multipoint Multi-Point injection system houses more sensors and actuators than the Single Point injection system. The components used in addition to Single Point injection are mentioned below. Climate control Cruise Control Traction control Pre and Post Lambda sensor. Variable Valve Timing actuator. Knock Sensor Oil Sensor Hall Effect Sensor One major addition to the whole operation of the multi-point injection system is the ignition system. Multi Point injection system uses individual coil per each cylinder, whereas Single Point injection system uses the conventional ignition system. The basic principle of operation for each coil remains the same as the conventional. By having single coil per cylinder, the time available to build up coil energy is greater than having a single coil providing spark to all cylinders. For example on an eight cylinder engine with eight individual ignition coils, each coil will have 8 x longer time to complete one whole ignition cycle compared to the conventional engine using single coil for all cylinders. The available à ¢Ãƒ ¢Ã¢â‚¬Å¡Ã‚ ¬Ãƒâ€¹Ã…“dwellà ¢Ãƒ ¢Ã¢â‚¬Å¡Ã‚ ¬Ãƒ ¢Ã¢â‚¬Å¾Ã‚ ¢ time is therefore also up to eight times longer. And there will no wasted spark. Therefore, the car will need no tuning for speed advance, or load advance, and spark will me more efficient. Multi-Point injection system has more components, therefore having more control over the engine, and meeting the emission standard. It helps the engine to run more cleaner, and perform better, with respect to any weather conditions. It also improves the fuel economy, as distribution of fuel is appropriate to each cylinder.

Emile Durkheim: Social Change Theory Essay

Emile Durkheim, the father of sociology, in his text the Rules of Sociological Method, has asserted that the disciplinal distinction between the social and natural sciences necessitates the differentiation in the variables and processes of analysis. This is why the idea of social facts was conceived, to refer to the intangibles that occur as product of social interactions between humans, who creates realities because of the constant cycle of agreement-disagreement, decision-making, and rationalization. The observable, and sometimes unconscious, social occurrences and structures that operate in the society are what constitute social facts. The social facts are realities that are not stagnant and inflexible as they are constantly subject to social change. The social change theory is the understanding that the dynamic interactions in the social milieu create phenomena that is continual and constant – change. This change is hence the product of societal structures that determines processes and mechanisms that results in particular outcomes. The Social Change Theory It is important to note that throughout history, different scholars offered different lenses in analyzing the reality of social change. How a particular thinker perceives the concept of change has often mirrored the social conditions of the era. Haferkamp and Smelser (1998) notes that it was during the French and Industrial Revolutions, periods of social dynamism, has ushered the focus and locus on the concept of social change in the understanding of the interaction and vibrancy of units of the society. Philosophical thinkers had thus began the movement from the recognition of natural constants and the inclination to support contractual, natural occurrences, to eventually recognize the potentiality of social change as the theoretical angle in comprehension of social phenomena. The understanding of social change does not confine itself to the elucidation of the present, but also the explication of historical experiences of humans, like the ancient empires or the civilizations. Meanwhile, the contemporary approach of social change theory develops itself into creating an order that is more generalized so as to illuminate the problems and processes of change in a broader view of the present and the past. According to Haferkamp and Smelser (1998), the theory of social must include three fundamental elements that relates and links up to one another: (1) structural determinants, (2) processes and mechanisms, and (3) directions and consequences. Below is the graphical illustration of the elements of social change: The above representation may seem simple, but the social change follows the process, of mechanisms and social processes being dictated by structural determinants, which results into outputs and consequences that are accumulated. It is also important to note that although the social change theories are considered fundamentals in the sociological study and discipline, it is nevertheless wanting of more theoretical development. Social change theories are in fact not devoid of problems. Although social changes is beyond the limits and often exceeds the explanations of single (mono-causal) theories, such theory is still consequential in explaining some realities. Such theories of course tend to disintegrate once confronted by changes that are unprecedented or when employed for purposes of prescription or prediction. Meanwhile, the complex multi-causal theories encounters difficulty in harmonizing multitudes of variables and determinants that produces multiple outcomes, making it more difficult to construct. The prospects of social change theory are of course not to be denied, as it aptly explains the dynamic structures that operate in the social setting. The contribution of Emile Durkheim, which would be discussed in the subsequent paragraphs, contributed immensely in the crafting and development of the theories of social change. Durkheim’s Theory of Social Change The air does not cease to have weight, although we do not feel that weight. –Emile Durkheim The contribution of Durkheim of the idea of â€Å"social facts† has contributed vastly to the sociological analysis during his and the contemporary period, as he poses the hypothesis that humans are essentially surrounded and enclosed in the countless facts and realities, which is in existence even without recognition or knowledge of such particular reality. Similar to the person’s inability to always feel the weight of the air, it does not signify the absence of the weight or of the air; this illustrates how people are not always capable of discerning realities – social facts, whose presence in fact are never absent or lacking, as these facts constantly moves people forward and affect behavior and actions. It awareness only becomes apparent in situations where one deviates from it, like for instance, we become aware of the culture of respect/cleanliness when someone throws his debris on the street. Social transformations are experienced in events where the unexpected and unprecedented is what transpires, and these are essentially the instances that advance the knowledge of the sociologist/philosopher. For Durkheim, social change is represented by transformations in the social morphology -or the structure of social relations that links individuals into a coherent entity, society- and the moral structure -or the body of laws, norms, and sanctions that regulate social life. (Hadis, Sociology and Social Change) For Durkheim, the point of the study of social sciences if to focus on facts that are essentially dissimilar and varied from the subject of the natural science, which is why something as intangible as, for example, culture, is a point of discussion and analysis for Durkheim. Social science hence is a study that distinguishes itself from the natural science, and therefore necessitates recognition of facts that are products of human and social interaction – social fact. Durkheim studies he reasons why suicide happens,w hich he concludes is a product of normlessness, which is a product of prevailing culture, which mirrors life of the individual – and what is more intangible than culture and life. Durkheim was concerned with anomie, a pathological -and, thus, temporary- characteristic of societies in which the division of labor does not evolve naturally, but may be forced by unequal social relations among classes. (Hadis, Sociology and Social Change) Durkheim’s scheme of social change involves a contrast between a simple division of labor and a corresponding mechanic solidarity, on the one hand, and a complex division of labor accompanied now by what he called organic solidarity, on the other. (Hadis, Sociologya and Social Change) The anomie is in the society is used by Durkheim to defer to the declining morality of individuals, and it is something that confronts the individual when they are not bounded by moral constraints, therefore creating confusions between what is morally right or otherwise. It is in the context of collective social morality that social change is most mirrored and become promising. In a society that gives premium to individualism, which is not morally bad (except for egoism), the solution is the formation of collective morality. The point of social change hence is that social facts are constantly subject to transformations and evolutions that are responses to existing values, situations, and structures that determine social outcomes and processes. Durkheim uses differentiation in his explication of the social change theory; Alexander (in Haferkamp and Smelser, 1992) explains it clearly: He used differentiation theory to grope with issues that are generic to the study of social changes as such. Each of Division’s three parts represents one important way in which social change has been conceptualized: through the construction of general models, through developing accounts of social process, and through historically specific analyses of tensions and strains. Durkheim’s problem, in other words, is an enduring one with which every perspective on change must come to grips. The problem of integration is one of the fundamental problems for Durkheim. In the reality of social change in how the labor structure is being organized, how is it therefore possible for the society to maintain order and stability? Durkheim has highlighted in his work how the perpetual action diversity has affected the society, and how the process and social structures has taken the perpetual cycle of bound and rebound. The social change theory of Emile Durkheim gives the clear picture of how cultural determinants are strong factors for the change dynamics and outcomes in the society. Differentiation hence becomes important, as social phenomena are complex occurrences that are not capable of being confined by inflexible theories. The understanding of social change is a product therefore of the analytical accommodation to encompass and recognize the cultural and social facts that operates and dictates the transformations occurring in the social milieu. References Durkheim, Emile. (1982). The Rules of Sociological Method and Selected Texts on Sociology and its Method. Steven Lukes, Ed. USA: The Free Press. Hadis, Benjamin. â€Å"Sociology and Social Change†. Accessed 22 January 2008 Haferkamp, Hans and Neil Smelser, Eds. (1992). Social Change and Modernity. USA: University of California Press. Noble, Trevor. (2000). Social Theory and Social Change. USA: Palgrave.

In the Skin of a Lion Essay - 996 Words

In the Skin of a Lion Historical Obliviousness in Michael Ondaatjes In the Skin of a Lion Michael Ondaatjes In the Skin of a Lion narrates the forgotten stories of those who contributed to the building of the city Toronto, particularly immigrants and marginal individuals. In the very first page of the novel, Ondaatje stresses the concern with personal narratives and the act of storytelling: This is the story a young girl gathers in a car during the early hours of the morning [...] She listens to the man as he picks up and brings together various corners of the story... (4). Similar to Crossing the River, there is a framework story, that of a man telling a story to a girl, that opens and ends the novel and gives coherence to†¦show more content†¦However instead of employing historical contexts to create the tension, Ondaatje makes subtle but explicit comments on historical oblivion to individuals and their stories. History is implicitly considered as a master narrative that allows no space to articulate local narratives and to account for the richness, variet y and complexity of human experience. To counterbalance the omissions and partiality of the historical master narrative, the alternative Ondaatje proposes is to privilege and celebrate a plurality of private and local narratives that give voice to the forgotten of History. Caravaggio, for example, is sadly aware of his being left out of the History of the city he has helped to build. Like Nicholas Temelcoff, he is painfully conscious of his anonymity and marginality: He was anonymous.[...] He would never leave his name where his skill had been. He was one of those who have a fury or a sadness of only being described by someone else (199). His story has never been legitimised. When Nicholas Temelcoff realises how he has been sewn into history. [He decides] he will begin to tell stories (149) to appropriate his own life. 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The Hunchback of Notre-Dame (1831) by Victor Hugo

Count Frollo, Quasimodo, and Esmeralda are quite possibly the most twisted, most bizarre, and most unexpected love-triangle in literary history.  And if their problematic involvement with one another is not enough, throw-in Esmeralda’s philosopher husband, Pierre, and her unrequited love-interest, Phoebus, not to mention the self-isolated mother-in-mourning with a sad history of her own, and Frollo’s younger, trouble-making brother Jehan, and finally the various kings, burgesses, students, and thieves, and suddenly we have an epic history in the making. The Leading Role The main character, as it turns out, is not Quasimodo or Esmeralda, but Notre-Dame itself.  Almost all of the major scenes in the novel, with a few exceptions (such as Pierre’s presence at the Bastille) take place at or in view of/reference to the great cathedral. Victor Hugo’s primary purpose is not to present the reader with a heart-rending love story, nor is it necessarily to comment on social and political systems of the time; the main purpose is a nostalgic view of a diminishing Paris, one which puts its architecture and architectural history in the forefront and which laments the loss of that high art.   Hugo is clearly concerned with the public’s lack of commitment toward preserving the rich architectural and artistic history of Paris, and this purpose comes across directly, in chapters about the architecture specifically, and indirectly, through the narrative itself. Hugo is concerned with one character above all in this story, and that is the cathedral.  While other characters have interesting backgrounds and do develop slightly over the course of the story, none seem truly round.  This is a minor point of contention because though the story may have a loftier sociological and artistic purpose, it loses something by not also working completely as a stand-alone narrative.   One can certainly empathize with Quasimodo’s dilemma, for instance, when he finds himself caught between the two loves of his life, Count Frollo  and Esmeralda.  The sub-story relating to the mourning  woman who has locked herself in a cell, weeping over a child’s shoe is also moving, but ultimately unsurprising.  Count Frollo’s descent from learned man and upstanding caregiver is not entirely unbelievable, but it still seems sudden and quite dramatic.   These subplots suit the Gothic element of the story nicely and also parallel Hugo’s analysis of science versus religion physical art versus linguistics, yet the characters seem flat in relation to the overall attempt by Hugo to re-instill, through means of Romanticism, a renewed passion for the Gothic era. In the end, the characters and their interactions are interesting and, at times, moving and hilarious.  The reader can engage with and, to a certain extent, believe them, but they are not perfect characters. What moves this story along so well, even through chapters such as â€Å"A Bird’s Eye View of Paris† which is, literally, a textual description of the city of Paris as if looking at it from on high and in all directions, is Hugo’s great ability at crafting words, phrases and sentences.   Although inferior to Hugo’s masterpiece, Les Misà ©rables (1862), one thing the two have in common is richly beautiful and workable prose.  Hugo’s sense of humor (especially sarcasm and irony) is well developed and leaps across the page. His Gothic elements are appropriately dark, even surprisingly so at times. Adapting a Classic What is most interesting about Hugo’s Notre-Dame de Paris is that everyone knows the story, but few really know the story.  There have been numerous adaptations of this work, for film, theater, television, etc.  Most people are probably familiar with the story through various retellings in children’s books or movies (i.e. Disney’s The Hunchback of Notre Dame).  Those of us who are only familiar with this story as told through the grapevine are led to believe that it is a tragic Beauty and the Beast type love-story, where true love rules in the end.  This explanation of the tale could not be further from the truth. Notre-Dame de Paris  is first and foremost a story about art, mainly, architecture. It is a romanticizing  of the Gothic period and a study of the movements which brought together traditional art forms and oratory with the novel idea of a printing press. Yes, Quasimodo and Esmeralda are there and their story is a sad one and yes, Count Frollo turns out to be a downright despicable antagonist; but, ultimately, this, like Les Misà ©rables  is more than a story about its characters; it is a story about the whole history of Paris and about the absurdities of the caste system.   This may be the first novel where beggars and thieves are cast as the protagonists and also the first novel in which the entire societal structure of a nation, from King to peasant, is present. It is also one of the first and most prominent works to feature a structure (the Cathedral of Notre-Dame) as the main character. Hugo’s approach would influence Charles Dickens, Honorà ©Ã‚  de Balzac, Gustave Flaubert, and other sociological â€Å"writers of the people.† When one thinks of writers who are geniuses at fictionalizing the history of a people, the first who comes to mind might be Leo Tolstoy, but Victor Hugo certainly belongs in the conversation.