How Does Regenerative Braking in Hybrid Cars Work

Hybrids and all-electric vehicles create their own power for battery recharging through a process known as regenerative braking (regen mode). Weve explained what regenerative braking is and how the process works in general terms, but many folks are interested in the deeper nuts and bolts of electricity generation. They understand that in a hybrid or all-electric vehicle the word regenerative, in terms of regenerative braking, means capturing the vehicles momentum (kinetic energy) and turning it into electricity that recharges (regenerates) the onboard battery as the vehicle is slowing down and/or stopping. It is this charged battery that in turn powers the vehicles electric traction motor. In an all-electric vehicle, this motor is the sole source of locomotion. In a hybrid, the motor works in partnership with an internal combustion engine. But that motor is not just a source of propulsion, its also a generator. Any permanent magnet motor can operate as either a motor or generator. In all-electrics and hybrids, they are more precisely called a motor/generator (M/G). But the technologically curious want to know more, and theyll often ask How, and by what mechanism or process, is the electricity created? Its a good question, so before we get started explaining how M/Gs and regenerative braking work in hybrids and electric vehicles, it is important to have basic knowledge about how electricity is generated and how a motor/generator functions.   So How Does a Motor/Generator Work in an Electric or Hybrid Vehicle? No matter the vehicle design, there must be a mechanical connection between the M/G and the drivetrain. In an all-electric vehicle, there could be an individual M/G at each wheel or a central M/G connected to the drivetrain through a gearbox. In a hybrid, the motor/generator could be an individual component that is driven by an accessory belt from the engine (much like an alternator on a conventional vehicle--this is how the GM BAS system works), it could be a pancake M/G that is bolted between the engine and transmission (this is the most common setup--the Prius, for example), or it could be multiple M/Gs mounted inside the transmission (this is how the two-modes work). In any case, the M/G has to be able to propel the vehicle as well as be driven by the vehicle in regen mode. Propelling the Vehicle with the M/G Most, if not all, hybrids and electrics use an electronic throttle control system. When the throttle pedal is pushed, a signal is sent to the onboard computer, which further activates a relay in the controller that will send battery current through an inverter/converter to the M/G causing the vehicle to move. The harder the pedal is pushed, the more current flows under the direction of a variable resistance controller and the faster the vehicle goes. In a hybrid, depending upon load, battery state-of-charge and the design of the hybrid drivetrain, a heavy throttle will also activate the internal combustion engine (ICE) for more power. Conversely, lifting slightly on the throttle will decrease current flow to the motor and the vehicle will slow down. Lifting further or completely off the throttle will cause the current to switch direction — moving the M/G from motor mode to generator mode — and begin the regenerative braking process. Regenerative Braking: Slowing the Vehicle and Generating Electricity This is really what the regen mode is all about. With the electronic throttle closed and the vehicle still moving, all of its kinetic energy can be captured to both slow the vehicle and recharge its battery. As the onboard computer signals the battery to stop sending electricity (via the controller relay) and start receiving it (through a charge controller), the M/G simultaneously stops receiving electricity for powering the vehicle and starts sending current back to the battery for charging. Remember from our discussion on electromagnetism and motor/generator action: when an M/G is supplied with electricity it makes mechanical power, when its supplied with mechanical power, it makes electricity. But how does generating electricity slow the vehicle? Friction. Its the enemy of motion. The armature of the M/G is slowed by the force of inducing current in the windings as it passes over the opposing poles of the magnets in the stator (its constantly battling the push/pull of the opposing polarities). It is this magnetic friction that slowly saps the vehicles kinetic energy and helps scrub off speed.

Langston Hughes And The Harlem Renaissance - 1219 Words

Langston Hughes and the Harlem Renaissance The Harlem renaissance is an artistic revolutionary period that took place between 1917 and 1937. This was after the First World War. Harlem was a district in New York. The Harlem renaissance impacted the social, cultural as well as artistic aspects of the black community. Many black people were encouraged to flee the southern sides where the caste system continued to oppress the black people. At this period, racial inequalities as well as other social injustices were at their peak (Huggins 50). Many poets, singers, as well as artists, moved into Harlem where black culture was openly celebrated, and the racial restrictions were not tight. Langston Hughes was among the people who immigrated into the Harlem region. He arrived in Harlem in 1924 and played a significant role in the Harlem renaissance. He was a poet, and most of his poems represented the feelings of the black American people at the time (Hughes 150). The Harlem renaissance is the most historic literary movement to the black population in America. It is a popular cultural movement in the history of the African culture. The movement helped usher in the Civil rights movements of the 1940s and the 50s. The movement is significant mainly because of the period in which it exploded. The Harlem district of New York was formed by diverse groups of African Americans with various aspects of the black culture. This was because of the African Americans moving into Harlem because ofShow MoreRelatedThe Harlem Renaissance By Langston Hughes1033 Words   |  5 Pagescalled the Harlem Renaissance. After World War I, many blacks migrated from the south to up to the north to places like Chicago, Detroit and New York. The people in Harlem felt the racial pride and this caught the attention of many musicians, writers, and artist. The Harlem Renaissance period lasted from 1920 to around 1935. Even though this period was short, it still lives on thou gh all African American artists today. According to Biography.com in the article about Langston Hughes, there wereRead MoreThe Harlem Renaissance with Langston Hughes1676 Words   |  7 PagesHarlem Renaissance with Langston Hughes The Harlem Renaissance brought about uniqueness amongst African Americans; everything was new. The visual art, the jazz music, fashion and literature took a cultural spin. During this time writer Langston Hughes seemed to outshine the rest with amazing works. The Harlem Renaissance brought about many great changes. It was a time for expressing the African American culture. It is variously known as the Harlem Renaissance, the Black Literary RenaissanceRead MoreThe Harlem Renaissance By Langston Hughes Essay1225 Words   |  5 Pages† - Langston Hughes The Harlem Renaissance took place in Harlem, New York during the 1920’s. The movement was an expression of African American culture across the Midwestern and Northeastern states of America, with Harlem being the heart of it. The Harlem Renaissance also left a lasting impression on black writers from the Caribbean and other African Colonies who immigrated to Paris. There were many artists of many different mediums that left a lasting impact of black culture, and Langston HughesRead MoreLangston Hughes And The Harlem Renaissance1909 Words   |  8 PagesThe Harlem Renaissance was a social and cultural movement aimed to alter the conventional notion of â€Å"The Negro† and to expound on African American’s adversities through literature, music, and visual arts. After World War I, Harlem, New York became a central location for African Americans for greener pastures and racial equality. Large quantities of black writers, artists, and intellectuals emerged within the urban scene and played a pivotal role of defining the movement in their respective fieldsRead MoreLangston Hughes And The Harlem Renaissance1736 Words   |  7 PagesAug 2017 The Dream Called Langston As an artist, or literature, music or visual art, there is power in creating pieces that move the masses. For an African American artist in the 1920’s, that power was fought for harder and dimmed due the racial inequalities across America. Being acknowledged as a credible artist was equated to being acknowledged as an American during a time where African American citizens were not considered an equal under the law. The Harlem Renaissance, spanning from the mid 1920’sRead MoreLangston Hughes And The Harlem Renaissance1476 Words   |  6 Pages Langston Hughes, a Voice for the Taciturn Take a time machine back to one of the most culturally-rich times in history, the Modern Age. More specifically, set your destination to northern Manhattan in the early 20s. When you step onto those bustling streets, you’ll find yourself swept up in the Harlem Renaissance. The contemporary writers you are surrounded by are legends such as Langston Hughes and W. E. B. DuBois, and the contemporary musicians you may hear at a local nightclub include some ofRead MoreThe Harlem Renaissance By Langston Hughes1703 Words   |  7 Pagesis a quote from a well-known poet by the name of Langston Hughes who served as a prominent figure in African American history and is known for maintaining a significant role in one of the most culturally influential periods for African Americans -The Harlem Renaissance. The Harlem Renaissance describes a significant era in time where hundreds or artists, writers and musicians living in Harlem came together to form a vibrant, creative community. Hughes along with many other talented and innovative AfricanRead MoreThe Harlem Renaissance : Langston Hughes1145 Words   |  5 Pagesplace called Harlem and this is where it all started. Harlem became the training ground for blues and jazz and gave birth to a young generation of Negro Artist, who referred to themselves as the New Negro. The New Negro was the base for an epoch called the Harlem Renaissance. The Harlem Renaissance allowed for the materialization of the double consciousness of the Negro race as demonstrated by artists such as Langston Hughes. During the peak of the Harlem Renaissance, Langston Hughes created poetryRead MoreLangston Hughes : The Harlem Renaissance1151 Words   |  5 Pagesmass movement of people is called the Great Migration. One of the most popular places African Americans moved to was Harlem, New York. This city was a cultural and artistic polestar for people of color. It became known for the start of the African American cultural and artistic revolut ion known as the â€Å"Harlem Renaissance†. Out of the Renaissance came poet Langston Hughes. Hughes’ grandparents were abolitionists and worked to instill the same sense of justice into him, which can be seen in his writingsRead MoreAspects Of Langston Hughes And The Harlem Renaissance755 Words   |  4 Pagesdiscrimination, the Harlem Renaissance was a time of emergence for African Americans artists. Several writers such as Langston Hughes emerged during this period. African American writers who emerged during the Harlem Renaissance were heroes to lower-class blacks living in Harlem. Langston Hughes was a household name amongst the lower-class during the Harlem Renaissance. Hughes’s poetry was strongly influenced by the Harlem Renaissance because of his love for the black masses. Hughes was determined to

Why Coal Is Not Bad Free Essays

Coal was mined in this country before it was even a country. The first thirteen states appeared on a United States flag after coal mines appeared on our maps. Coal has helped power America for nearly 300 years and has been an essential part of the U. We will write a custom essay sample on Why Coal Is Not Bad or any similar topic only for you Order Now S economy since the turn of the century. It was the first fossil fuel used extensively by humans, and is still vitally important today, generating 39 percent of the world’s electricity, and 49 percent of U. S. electricity. Coal power, an established electricity source that provides a vast quantity of inexpensive, reliable power has become more important as the world is becoming more advanced. Modern life is unimaginable without electricity. It lights houses, buildings, streets, provides domestic and industrial heat, and powers most equipment used in homes, offices and machinery in factories. As you can tell, coal plays a vital role in electricity generation worldwide. Coal is a quick an easy thing to produce, transport and generate. With coal mines located in almost 70 different countries, it is not a problem for the supply and demand. Also, coal supplies in the United States are far more plentiful than domestic oil or natural gas; they account for 95 percent of the country’s fossil fuel reserves and more than 60 percent of the world’s fuel reserves. Not only that, but the United States has about 275 billion tons of recoverable coal, which could last us more than 250 years if we continue using coal at the same rate as we use it today. So here is the question. Why would you want to get rid of coal fired power plants that give people jobs, is easy to mine and is plentiful and inexpensive for the alternative which is inconsistent and costly? How to cite Why Coal Is Not Bad, Essay examples

Why Coal Is Not Bad Free Essays

Coal was mined in this country before it was even a country. The first thirteen states appeared on a United States flag after coal mines appeared on our maps. Coal has helped power America for nearly 300 years and has been an essential part of the U. We will write a custom essay sample on Why Coal Is Not Bad or any similar topic only for you Order Now S economy since the turn of the century. It was the first fossil fuel used extensively by humans, and is still vitally important today, generating 39 percent of the world’s electricity, and 49 percent of U. S. electricity. Coal power, an established electricity source that provides a vast quantity of inexpensive, reliable power has become more important as the world is becoming more advanced. Modern life is unimaginable without electricity. It lights houses, buildings, streets, provides domestic and industrial heat, and powers most equipment used in homes, offices and machinery in factories. As you can tell, coal plays a vital role in electricity generation worldwide. Coal is a quick an easy thing to produce, transport and generate. With coal mines located in almost 70 different countries, it is not a problem for the supply and demand. Also, coal supplies in the United States are far more plentiful than domestic oil or natural gas; they account for 95 percent of the country’s fossil fuel reserves and more than 60 percent of the world’s fuel reserves. Not only that, but the United States has about 275 billion tons of recoverable coal, which could last us more than 250 years if we continue using coal at the same rate as we use it today. So here is the question. Why would you want to get rid of coal fired power plants that give people jobs, is easy to mine and is plentiful and inexpensive for the alternative which is inconsistent and costly? How to cite Why Coal Is Not Bad, Essay examples