#InternalCombustionEngine

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[dorleco]

Internal Combustion Engine

March 5, 2024

 by dorleco

with no comment

 Autonomous Vehicle Technology

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Introduction

In the United States, internal combustion engines power almost 250 million highway vehicles due to their exceptional longevity and drivability. They can run on renewable or alternative fuels in addition to gasoline or diesel (e.g., natural gas, propane, biodiesel, or ethanol). Additionally, they can be paired with plug-in hybrid electric systems to increase the range of hybrid electric vehicles or with hybrid electric powertrains to improve fuel efficiency.

Internal combustion engines are divided into two groups:

Continuous combustion:

Engines with both intermittent and continuous combustion. Fuel and oxidizer enter the engine steadily, which is the hallmark of a continuous-combustion engine. An engine (such as a jet engine) maintains a steady flame.

Intermittent-combustion engines:

The air and fuel in an intermittent combustion engine ignite periodically, giving rise to the term “reciprocating engine.” A cycle is used to process discrete amounts of fuel and air. Examples of this second type are diesel engines and gasoline piston engines.

A sequence of thermodynamic events can be used to describe internal combustion engines. Thermodynamic processes take place concurrently in a continuous-combustion engine as the fuel, oxidizer, and combustion products move through the engine in a steady flow.

In contrast, all of the events in an intermittent combustion engine happen one after the other and are repeated throughout each cycle.

Internal combustion engines consume air, compress it, and either introduce fuel into the air or compress the air-fuel combination. Rockets are an exception to this rule, as they use both liquid-propellant and solid rocket motors.

The air-fuel mixture is then burned, work is obtained from the expansion of the hot gaseous combustion products, and finally, the combustion products are discharged through the exhaust system, as is the case with all internal combustion engines.

Their functioning can be compared to that of external combustion engines (such as steam engines), where energy is obtained exclusively by heat transfer to the working fluid via a heat exchanger and no chemical reaction occurs in the working fluid.

The four-stroke, gasoline-powered, homogeneous-charge, spark-ignition engine is the most widely used internal combustion engine. This might be attributed to its exceptional performance as a leading player in the ground transportation sector.

The aeronautics industry uses spark-ignition engines as well, but because of its focus on range, speed, and passenger comfort, aircraft gas turbines have emerged as the industry’s main players.

Exotic systems including advanced rocket engines and motors, like those found on U.S. space shuttles and other spacecraft, and supersonic combustion ramjet engines (scramjets), like those envisioned for hypersonic aircraft, are also included in the category of internal combustion engines.

How Does An Internal Combustion Engine Work?

The fundamental chemical process of releasing energy from a fuel and air mixture is called combustion, or burning. The process of fuel ignition and combustion in an internal combustion engine (ICE) takes place inside the engine. After that, the engine uses a portion of the energy produced by combustion to power itself. A stationary cylinder and a moving piston make up the engine. The crankshaft rotates as a result of the piston being pushed by the expanding combustion gasses. In the end, this action turns the wheels of the car through a set of gears in the powertrain.

The spark-ignition gasoline engine and the compression-ignition diesel engine are the two types of internal combustion engines that are currently in production. The majority of these are four-stroke engines, which require four piston strokes to complete a cycle. The intake, compression, combustion, power stroke, and exhaust are the four independent operations that make up the cycle.

The methods used by compression ignition diesel engines and spark ignition gasoline engines to feed and ignite fuel are different. During the intake phase in a spark ignition engine, fuel and air are combined and then forced into the cylinder. The fuel-air mixture is compressed by the piston and then ignited by the spark, leading to combustion. During the power stroke, the piston is pushed by the combustion gasses’ expansion. Only air is introduced and subsequently compressed into an engine in a diesel. The fuel then ignites when diesel engines spray it into the hot compressed air at a proper, controlled rate.

In essence, an internal combustion engine converts the air-fuel mixture’s heat energy into mechanical energy. The reason it is named Four Strokes is that a full combustion cycle in the piston requires four strokes to complete. An internal combustion engine, sometimes known as an ICE (internal combustion engine), is a four-stroke piston engine that powers a passenger car.

Let’s now investigate which constitutes an ICE’s principal parts.

The camshaft(s), valves, valve buckets, valve return springs, spark/glow plugs, and injectors (for direct injection engines) are typically located in the cylinder head. The engine’s cooling liquid passes via the cylinder head.

We can locate the piston, connecting rod, and crankshaft inside the engine block. Regarding the cylinder head, coolant passes through the engine block to assist in regulating the engine’s temperature.

From BDC to TDC, the piston travels inside the cylinder. When the piston is near TDC, a volume is formed between the cylinder head, engine block, and piston. This space is known as the combustion chamber.

An ICE with four strokes has the following phases (strokes) in a complete engine cycle:

Intake power (expansion) exhaust compression intake The piston’s movement between the bottom and top dead centers is referred to as a stroke.

Now that we are aware of an ICE’s constituent parts, we can investigate the actions that take place throughout each engine cycle stroke. The position of the piston at the start of each stroke and the specifics of what happens inside the cylinder are displayed in the table below.

Stroke 1 – INTAKE

Stroke 2 – COMPRESSION

 After the intake stroke is complete, the piston begins the compression stroke at BDC. The intake and exhaust valves close during the compression stroke, and the piston travels toward TDC. The air/mixture is compressed when both valves are closed, and when the piston approaches TDC, the pressure reaches its maximum. During the compression stroke, just before the piston reaches TDC (but not quite there),

Stroke 3 – POWER

Stroke 4 – EXHAUST

After the power stroke is over, the exhaust stroke begins with the piston at the BDC. There is an open exhaust valve during this stroke. Most of the exhaust gasses are forced out of the cylinder and into the exhaust pipes by the piston’s movement from the BDC to the TDC. The engine uses energy during the exhaust stroke because the components’ inertia causes the crankshaft to rotate.

As you can see, the piston needs to make four strokes to complete a combustion (engine) cycle. This indicates that two full crankshaft revolutions (720°) are required for one engine cycle.

Advantages of internal combustion engines

Engine size is extremely small in comparison to external combustion engines.

The power-to-weight ratio is elevated.

Excellent for applications with low power requirements

Typically, more transportable than external combustion engines of the same kind

safer to use with a much shorter start time

Higher efficiency compared to an external combustion engine

There is no possibility of working fluid leaks minimal upkeep is necessary

Compared to external combustion engines, there is a reduction in lubricant use.

Because the peak temperature is only achieved briefly (during the fuel’s explosion), the overall working temperature in the case of reciprocating internal combustion is modest.

Disadvantages of internal combustion engines

The range of fuels available for utilization is restricted to extremely high-quality gaseous and liquid fuels.

Fuel utilized, such as gasoline or diesel, is quite expensive.

In general, engine emissions are higher than those of an external combustion engine.

Unsuitable for producing significant amounts of power When there is reciprocating internal combustion, fuel detonation produces noise.

Types and applications of internal combustion engine:

Gasoline engines are utilized in automobiles, boats, and airplanes.

Gas engines are employed to provide industrial power.

Diesel engines are utilized in the automotive, railroad, power, and marine industries.

Gas turbines: They are employed in the maritime, industrial, and aircraft industries.

Conclusion:

To sum up, for more than a century, internal combustion engines have been essential in powering a variety of industry and transportation options. They are essential to contemporary industrialization and mobility because of their effectiveness, dependability, and flexibility. However, the desire to switch to greener, more sustainable options is growing as worries about the effects on the environment and the depletion of resources increase.

Internal combustion engines’ dependence on fossil fuels is still a severe disadvantage, despite notable improvements in efficiency and emissions reduction. Research and development efforts are being directed toward alternative fuels like biofuels and hydrogen, as well as electrification technologies like electric and hybrid powertrains, in an attempt to address these problems.

Moreover, the use of sophisticated engine management systems, lightweight materials, and enhanced aerodynamics keeps improving internal combustion engine performance and fuel efficiency. To combat climate change and lessen reliance on limited resources, a thorough transition to greener transportation options is required.

In conclusion, even though internal combustion engines have proved essential to contemporary transportation and industry, there are growing concerns about their long-term viability. The key to the future is adopting cutting-edge technologies that balance environmental protection with the changing demands of society for dependable and efficient power sources.

Also Read: Things to know about Hybrid Powertrains

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Germany has successfully watered down a planned EU ban on the sale of combustion-engine cars European Union members formally approved a ban on the sale of new carbon dioxide (CO2)-emitting cars by 2035. What was meant to be a milestone legislation towards the decarbonization of the European car industry was watered down by Germany to provide an exemption for cars running on e-fuels.Read more... https://qz.com/eu-ban-combustion-engine-cars-electric-vehicles-germany-1850273664

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[lovelypol]

"Powering Progress: The Legacy and Future of Internal Combustion Engines 🚗⛽️"

The internal combustion engine (ICE) has been the driving force behind transportation for over a century, propelling vehicles of all shapes and sizes with the power of controlled explosions.

From the iconic rumble of classic muscle cars to the quiet hum of modern hybrids, ICEs have evolved alongside automotive technology, continually improving in efficiency, power, and environmental impact. While electric vehicles are gaining traction, ICEs remain dominant due to their affordability, reliability, and infrastructure compatibility. With advancements in fuel injection, turbocharging, and variable valve timing, today's ICEs achieve unprecedented levels of performance while meeting increasingly stringent emissions standards. As the automotive industry faces pressure to reduce carbon emissions and embrace sustainable alternatives, hashtags like #InternalCombustionEngine, #ICE, #FuelEfficiency, #AutomotiveInnovation, #EngineTechnology, #FutureOfTransportation, #CleanerEngines, #HybridPower, #GasolineEngines, #DieselEngines, #SustainableMobility, #DrivingExperience, #InnovationInEngineering, #EfficientPower, and #EngineEvolution reflect the ongoing dialogue surrounding the role of ICEs in shaping the future of mobility. With continued research into alternative fuels and hybrid powertrains, the legacy of the internal combustion engine will endure, driving progress towards a greener, more efficient automotive landscape. 🌿🔧

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[dorleco]

Introduction to Robot operating system

November 28, 2023

 by dorleco

with no comment

 Autonomous Vehicle Technology

Edit

Introduction

The open-source middleware system known as the Robot Operating System, or ROS for short, is used to create robotic software. It offers a collection of tools and frameworks that make it easier to create sophisticated and reliable robot applications. Open Robotics is currently responsible for maintaining ROS, which was first created by Willow Garage, a robotics research group.

Key features of ROS include:

Middleware Communication: ROS enables communication between various robotic system components. It facilitates information flow between nodes (separate software processes) using a publish/subscribe messaging system. In order to coordinate different operations inside a robotic system, communication is essential.

Package Management: Resources such as libraries, executables, configuration files, and other files are arranged into packages by ROS. This modular design streamlines the development process and encourages code reuse.

Hardware Abstraction: ROS gives programmers the ability to build code that is not dependent on the particular hardware platform by providing hardware abstraction. The creation of scalable and portable robotic applications is made possible by this abstraction layer.

Device Drivers: ROS comes with a number of device drivers for different robotic platforms, actuators, and sensors. The incorporation of additional devices into a robotic system is made easier by this pre-built support for standard hardware components.

Tools for Visualization: Robotic system monitoring, debugging, and visualization are all included in ROS. Tools that assist developers in comprehending and troubleshooting the behavior of their robots include the simulator Gazebo, the RQT graphical user interface, and the 3D visualization tool RViz.

Community Support: The lively and engaged community of ROS is one of its strongest points. Around the world, developers build and share packages, guides, and best practices as part of the ROS ecosystem. This cooperative setting encourages creativity and speeds up the creation of robotic applications.

Flexibility & Extensibility: ROS is made to be both extendable and adaptable, enabling developers to alter and expand its features to suit their own requirements. Because of its adaptability, ROS may be used for a variety of robotic applications, ranging from commercial goods to research prototypes.

Programming Languages Supported: C++, Python, and Lisp are just a few of the languages that ROS supports. Because of this flexibility, developers can utilize their most familiar language for different parts of their robotic applications.

Benefits of Robot operating system

Numerous advantages provided by the Robot Operating System (ROS) contribute to its acceptance and popularity in the robotics industry. The following are some main benefits of using ROS:

Community-driven and Open Source: ROS is an open-source framework, which permits unrestricted modification and redistribution of its source code. Within the international robotics community, cooperation and knowledge exchange are encouraged by ROS’s open nature. Its development is supported by developers all over the world, creating a rich ecosystem of resources, libraries, and packages.

Modularity and Reusability: The architecture of ROS is modular, with robotic software arranged into packages. Because of its modular design, which encourages code reuse, developers can more easily utilize pre-existing components to create new robotic applications. This quickens the development process and raises the software’s general quality.

Middleware for Communication: ROS offers a communication middleware that facilitates easy communication between various robotic system components. By using a publish/subscribe approach, this middleware facilitates easy information sharing between nodes. The coordination of several sensors, actuators, and algorithms within a robot is contingent upon this communication method.

Hardware Abstraction: ROS enables developers to write code that is not dependent on the particular hardware platform by abstracting the hardware layer. By offering a standardized interface for dealing with sensors, actuators, and other hardware components, this abstraction streamlines the development process. Additionally, it improves portability, which facilitates the adaptation of robotic software to various hardware setups.

Rich Set of Tools: Robot Development, Debugging, and Monitoring are made easier with the many tools that ROS provides. Robot behavior is better understood by developers because of visualization tools like RViz, debugging tools like RQT, and simulators like Gazebo, which facilitate the analysis and optimization of applications.

Device Drivers: For typical sensors and actuators, ROS comes with a large selection of pre-built device drivers. Developers can save time and effort by using this collection of drivers to make the integration of new hardware into robotic systems simpler.

Scalability: Because of its scalable nature, ROS can be used for a variety of robotic applications, ranging from small-scale research prototypes to massive industrial robots. Because ROS is modular and versatile, developers can expand their applications according to the requirements and complexity of the robotic system.

Support for Several Programming Languages: C++, Python, and Lisp are just a few of the languages that ROS supports. This language flexibility enables the integration of existing codebases written in many languages and accommodates developers with varying language preferences.

Simulation Capabilities: Before implementing ROS on real robots, developers can test and validate their robotic algorithms in a simulated environment thanks to its good integration with simulators such as Gazebo. Error risk is decreased with simulation, which can also expedite development.

Educational Resource: ROS is a great educational tool that lets hobbyists, researchers, and students learn about and work with robotics. Both novice and seasoned developers can use ROS because of its wealth of tutorials, documentation, and friendly community.

Drawbacks of Robot operating system

The Robot Operating System (ROS) has many benefits, but users may also run across some issues and problems with it. When thinking about using ROS for a specific robotic application, it’s critical to be aware of these constraints. The following are a few disadvantages of ROS:

Learning Curve: For those new to robotics and software development, in particular, ROS has a steep learning curve. Users may require some time to become skilled in comprehending and utilizing the different components and concepts inside ROS due to the system’s overwhelming complexity.

Resource-Intensive: ROS has the potential to be a resource-intensive program, using a large amount of RAM and computing power. Applications using limited resources, like lightweight robots or tiny embedded devices, may find this concerning.

Performance in Real Time: The original architecture of ROS did not consider real-time applications. Despite recent improvements to real-time capabilities, ROS might not be appropriate for applications like high-speed control systems that demand incredibly low latency responses.

Absence of Standardization: Although commonly utilized, ROS is not strictly standardized in some sectors. Similar functionality may be implemented slightly differently by different developers, which could cause compatibility problems when merging packages from multiple sources.

Security Issues: Because ROS is an open-source framework, security issues could arise. When using ROS in environments where security is a major concern, like robotics applications in the medical or defense industries, users must exercise caution.

Limited Industry Adoption: Although ROS is widely used in academia and research, its uptake in some companies, especially those with safety-critical applications, may be restricted. Industries with strict safety regulations could need more procedures for validation and verification.

Not Suitable for All Robotic Systems: Not every kind of robotic system is a good fit for ROS. For instance, the full potential of ROS may not be greatly beneficial for specialized or simple robots with low processing requirements, adding needless complexity.

Dependency Management: As the number of packages and their versions rises, it might be difficult to maintain dependencies across various ROS packages. Integration problems may arise from package version incompatibilities.

Limited Real-world Deployment Tools: Although ROS offers great simulation tools such as Gazebo, there could be difficulties when moving from simulation to real-world deployment. It might be challenging to create sturdy, dependable robotic systems that function flawlessly in the real world.

Continuous Evolution: The frequent release of new updates and versions of ROS may make it more difficult to sustain and maintain current robotic systems over the long run. There may be compatibility problems between various ROS versions.

Conclusion:

In conclusion, the Robot Operating System (ROS) stands as a powerful and versatile framework that has significantly contributed to the advancement of robotics research, development, and deployment. Its open-source nature, modular architecture, and extensive set of tools have propelled ROS into the forefront of the robotics community.

ROS has been instrumental in fostering collaboration and knowledge-sharing among developers, leading to a vibrant ecosystem of packages and libraries. The benefits of modularity and reusability have allowed for the creation of complex robotic systems with greater ease and efficiency. The middleware communication system enables seamless interaction between various components, contributing to the coordination of sensors, actuators, and algorithms within robots.

Despite its strengths, ROS does come with certain drawbacks, including a steep learning curve, resource intensity, and challenges in real-time applications. However, these limitations need to be weighed against the benefits, and developers must carefully consider the specific requirements of their projects.

In essence, ROS has played a pivotal role in democratizing robotics, providing a platform for both researchers and industry professionals to experiment, collaborate, and innovate. As technology continues to evolve, ROS is likely to adapt and remain a key player in shaping the future of robotics. Its impact on education, research, and industry applications underscores its significance in the broader landscape of robotic systems development.

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