mechanical views: Automated Manual Transmission

mechanical views: Automated Manual Transmission: MT (manual transmission) uses simple spur gears providing excellent transmission efficiency and thus typically get 10% or better fuel milea...

Automated Manual Transmission

MT (manual transmission) uses simple spur gears providing excellent transmission efficiency and thus typically get 10% or better fuel mileage than current ATs (automated transmissions). The object of the ATM (automated manual transmission ) is to automate starting and gear shifting while retaining this excellent fuel efficiency. A round of fierce competition was triggered among European manufacturers to see who would be the first to develop what is generally known as a conventional AMT that attempts to automate the shifting of MT. The problem with this design is that the drive torque is momentarily interrupted during shifting. This results in a very different shift feeling from an AT, and thus never saw the wide spread acceptance as a replacement for the conventional AT in mainstream vehicles. This was more recently followed by a twin clutch AMT that is receiving great deal of attention. Supporting smooth and responsive shifting much like an AT, the twin-clutch AMT has been installed by European vehicle manufacturer on some high engine capacity sport cars beginning last fall. Hitachi group has now developed an original torque-assist AMT that is fundamentally different from these other two approaches.

TORQUE-ASSIST AMT

In order to achieve widespread acceptance as a replacement for conventional transmissions, the next generation must provide the good fuel economy of an MT, the effortless shifting of an AT, and must also be compact and affordable. Unfortunately, the conventional AMT fails to achieve the seamless shifting of an AT and the twin clutch AMT is difficult to implement compactly and cost effectively.

Hitachi Group has proposed a third way that does meet all the above requirements a torque assist AMT and is now in the process of developing this system. A key advantage of this approach is that it can be implemented with relatively little modification to existing AMTs by simple adding a friction clutch called as assist clutch to the transmission. Action of the assist clutch effectively solves the torque interruption  problem of the conventional AMT while providing the smooth gear shifting of an AT.  A compact and economical torque assist AMT could thus be implemented fairly easily for application on mainstream FF (front-engine front-drive) compact vehicles with engine displacement with 2 liters.

DRIVERLESS CARS

For generations, the automobile industry has been a source of innovation and economic growth. The ability to drive is a symbol of mobility and independence that spans generations. Clearly, automobiles play a significant role in our lives and afford many benefits to society.

Yet for all benefits conferred on society, no other invention in the history of civilian technology has caused as much harm as the automobile. Every 30 seconds. someone dies in a traffic accident, adding up to well over 1 million deaths each year. In the US automobile accidents are the leading cause of death for people between the age of 3 and 34. Moreover,human error is the cause of over 90% of automobile accidents.

In addition the inefficiencies related with the automobile usage is staggering. Most automobiles sit unused more than 95% of their life span, and a freeway operating at maximum  efficiency has automobiles on only 5% of its surface. In congested urban areas, 40% of all gasoline used is spent when car looks for parking spaces. Furthermore, in some US cities, parking lots comprise more than third of the land, becoming the single salient landscape feature of our built environment.

Since its inception of the commercial auto industry in the late 1890s, cars have become increasingly safe and convenient. Recently, car makers have begun to introduce advanced driver-assistance systems such as adaptive cruise control (which automates accelerating and braking) and active lane assist (which automates steering). These systems have become capable enough that new luxury vehicles can drive themselves in slow moving highway traffics. Research into autonomous cars has progressed remarkably since the first demonstrations in the 1980s. In 2010, four driver less vans traveled from Italy to China. In august of 2012, google announced that its self-driving cars had completed over 300,000 miles of accident free autonomous driving. Although self-driving cars may still seems like science friction, Google, many industry analysts, auto suppliers, and car makers project that such cars will be available before 2020.  

CNG in India

Compressed natural gas(CNG) is a fuel that needs no introduction.  it is a cheap fuel to make and use, which is why it is so widespread in public transport. Not to mention that the second hand car market is greatly supported by CNG kits. vehicles like the Honda Civic, Accord and Toyota Corolla are favorites to be bought second hand and then have green fuel kits used to make them easy on the pocket. With diesel deregulation soon to kick in, the price of the oil will head north soon, so CNG seems like a good investment for those with regular usage. here's the brief look at advantages and disadvantages of CNG:

Advantages:

1. it is the green fuel. the emissions and hydrocarbons that are released as the by product of CNG usage are lesser than those created by regular fuel. Carbon monoxide emission are down by 70-85% while hydrocarbon levels are reduced by 40-60%.
2. the price fluctuation of the natural gas is less. Look back over the past few years and you'll notice that petrol and diesel prices have been on roller coaster ride, but CNG has the relative linear movement. this is because of domestic production which has no dependency on international movements.
3. Engine life improves.Contrary to popular beliefs, CNG is a better fuel for improving engine life as the carbon levels are greatly reduced.

Disadvantages:

1. The performance of the car is reduced significantly. On an average CNG users experience a crash about 10% in performance. 
2. The storage space is eaten up badly. CNG tanks a easily the size of large bag, so boot space is reduced or removes entirely as the fuel storage tank takes up all the room.
3. Availability is not a wide spread as regular gas stations. Within the city users probably have a list of stations that falls in the route, but beyond that it is an uncertainty. This is the reason why cars aren't made to run exclusively on CNG.
4. Blocked injectors. Cars with CNG kits should always be started on petrol and run for few kilometers before being switched to the green fuel. This warms up the engine better and gets the motor well lubricated. Petrol is expensive so drivers often chose not to use it.
5.  Fuel range. Although CNG is a cheaper fuel, the actual range on just CNG is lesser than petrol. Not to mention, running on a close to empty tank reduces the pressure and increases the risk of valve bursting. So, even if the car uses CNG, it is always wise to keep a regular flow of petrol both in tank and in the engine usage.

1. 
   

Desicant Cooling System

In the last 10 years, evaporative and desiccant cooling technology for air conditioning has increased as an alternative for air conditioning systems has increased as an alternative to the conventional vapour compression systems. A typical system combines a dehumidification system that uses a rotary desiccant wheel, with direct or indirect evaporative systems, allowing a filtered and cooled air supplying temperature, humidity and speed conditions that propitiate environmental thermal comfort, even in equatorial and tropical climates. These systems causes a lot of electrical power saving, mainly in place where thermal source energy source are easily found, where the price of electrical energy is high,where the latent heat percentage is high or where the needed air dew point is low. So, evaporative cooling systems that use absorption pre-dehumidification presents a great perspective in thermal comfort. It can be used in co-generation systems, where the needed heat to regeneration can be gotten from gas turbines exhaust gases or internal combustion engines or, still, from steam in plants that use steam turbine.

Experimental Analysis of an Air Washer

Hello World,

Today i will like tell you all about my 4th year project which was on the topic of experimental analysis of an air washer.
In the recent sanario the peoples are slowly getting conscious about the beast(pollution) intended to destroy our beautiful sphere(earth). This pollution had drastically spread in our world drastically in few years. It is sad to say but we are only responsible for it. The careless burning of fossil fuels, heavy growth in industries and inventions without considering about the earth safety pushed of us into this undesirable situation.

But now the peoples are thinking about what they are doing and what they had done including the government which taken so many steps for the control on pollution. The scientist's also get conscious about their invention which will be in the favor the reducing pollution.

  In India the refrigerants like R 22 is going to be banned in upcoming few years which is one of the major reason for the depletion of the ozone layer which causes global warming and some harmful skin disease's. These things created the requirement for the replacement of old cooling systems and introduction of the new inventions which are environment friendly.

My project was on the same concern me and my friends decided to try the project which can be the one of the substitute of the recent refrigeration system. On the suggestion of our professor we modified the air washer to not only work as an evaporative cooler but also can remove the sulphure dioxide from the air which is one of the gas responsible for green house effect.

In my project my team was using spray type air washer with the very simple design since it become easier to modify.

The spray type air washers consists of a chamber or casing containing a spray nozzle system, a sink for removing the spray water as it falls. And an eliminator section for the removal of moisture in the air. A pump recirculates water at the rate higher than the evaporation rate.

Intimate contact between the spray water and the air flow causes heat and mass transfer between the air and the water.
The air washer used in the industries has the basic use to clean air and control the properties of the air as per the requirement.

The air washer can perform two kinds of cooling:
1. Direct evaporative cooling
2.Indirect evaporative cooling

The direct evaporative cooling is done by the direct contact between sprayed water and the flowing air in the chamber.
Where the indirect evaporative cooling is done by providing heat exchanger at the front of air washer.
The syphon present in the heat exchanger is circulated by the cold water and the hot air is passed through the fins of the heat exchanger. Which causes heat exchange between air and water.

The indirect evaporative cooling was done in my project by the use of car radiator.

AIR WASHER SPECIFICATIONS

BLOWER

suction blower with 1HP, 3PHASE, 440 V and internal diameter 4 inch

NOZZLE SECTION

the nozzle section consist of:-

1. 4 elbow joints (0.5 inch bore)
2. 3 distributors (0.5 inch bore)
3. 10 vertical pipes (0.5 inch bore & 50 cm length)
4. 10 holes on vertical pipe each (1 mm bore)
5. 5 holes on horizontal pipe each (1 mm bore)

All the components in the nozzle section are made up of PVC material.

The body of the air washer was made up of the aluminium composite pannel. 
Two layers of simple cellulose pad was use in the eliminator section to absorb the moisture in the air.

The picture above will give you the brief and real understanding of the project.

The analysis was done with the following aims:
1. circulating the water at normal temperature and analyzing the changes in the property of the air
2. circulating hot water through air washer and analyzing the change in the properties of air
3. circulating chilled water through air washer and analyzing the changes in properties of air

I am providing some videos of working of my project i hope you will like it.

please give reviews on my publish and don't forget to follow.
your reviews are precious to me and your following will motivate to share new views
thank you.

introduction

Hello world,

This is saurabh kumar tiwari a mechanical engineer.
I made this blog to give you all the continuous updates about the activites happening in the mechanical sector and their possible effect on the global market.

so ,please follow me to get the fresh  updates.

thank you