Subject automotive electrical and electronic systems process report comparison cdi and tdi

These engines have a system of direct fuel injection, which reduces fuel consumption by 15 %.. A Capacitor Discharge Ignition or CDI is an electronic ignition device that stores an elect

HO CHI MINH CITY UNIVERSITY OF TECHNOLOGY AND DUCATION FACULTY FOR HIGH QUALITY TRAINING

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SUBJECT: AUTOMOTIVE ELECTRICAL AND ELECTRONIC SYSTEMS PROCESS REPORT

COMPARISON CDI AND TDI

Advisor: Ass Prof PhD Do Van Dung

Student’s Name Student’s ID

Kiều Ti n Anh 20145399 ế Võ Thanh Bình 20145025

Friday Shift 13 14 15 –

221AEES330233E

TABLE OF CONTENTS

INTRODUCTION 1

Chapter 1 DEFINE THE CDI AND TDI 2

1.1.Define and structure of the CDI 2

1.2.Define and structure of TDI 3

Chapter 2 THE BENEFITS AND DRAWBACKS 6

2.1.The benefits and drawbacks of the CDI engine 6

2.2.The benefits and drawbacks of the TDI engine 6

2.3.The comparison 7

CONCLUSION 8

REFERENCES 9

A INTRODUCTION

On the market, there are many vehicles that are equipped with CRDI clusters Some typical names can be mentioned such as Hyundai Santafe, i30, Tucson, etc The use of CRDI is considered one of the effective fuel-saving measures Not stopping there, harmful substances in the engine's exhaust are also significantly reduced The first CRDI system was tested by Professor Robert Huber in the 60s of the nineteenth century Then a research team in Switzerland went on to develop it Currently, many modern diesel engines use this system

Besides, TDI for diesel cars has also helped those vehicles to become close rivals of gasoline-powered cars, but they have not come without a cost, which is chiefly centered around how much the customer is prepared to pay for his vehicle With TDI cars costing more than their gasoline counterparts, they are still only bought by those with a real commitment to the environment, or who want to save money by converting the car to biodiesel fuel Even now, there are many cars that can be considered to be top sellers: Volkswagen Jetta TDI, Alfa Romeo, BMW, Mercedes Benz 320 BlueTec Turbo, Audi A3 Turbo Diesel, and Volkswagen Golf Turbo,

There are the reasons why we choose the topic "Comparison the CDI and TDI" Because of lack of times and knowlegles, we hope you forgive our mistakes We are very much looking forward to your assessment and suggestions Thank you for your reading!

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B CONTENTS

Chapter 1 DEFINE THE CDI AND TDI

1.1 Define the CDI • Define the CDI

CDI (Common Rail Diesel Injection) is a series of diesel engines from German Daimler AG, which are installed on Mercedes-Benz vehicles CDI motors were developed in 1997 and are successfully used today These engines have a system of direct fuel injection, which reduces fuel consumption by 15 % The manufacturer has increased the torque, so the power has increased by 40 %

The short form of the Capacitor discharge ignition is CDI which is also known as thyristor ignition It is one kind of automotive electronic ignition system, used in motorcycles, outboard motors, chainsaws, lawnmowers, turbine-powered aircraft, small engines, etc It was mainly developed to conquer the long charging times which are connected through high inductance coils employed for IDI (inductive discharge ignition) systems to make the ignition system more appropriate for high engine speeds The CDI utilizes capacitor discharge current toward the coil for firing the spark plugs

A Capacitor Discharge Ignition or CDI is an electronic ignition device that stores an electrical charge and then discharges it through an ignition coil in order to produce a powerful spark from the spark plugs in a petrol engine Here the ignition is provided by the capacitor charge The capacitor simply charges and discharges within a fraction of time making it possible to create sparks CDIs are commonly found on motorbikes and scooters

• Structure the CDI

A Capacitor Discharge Ignition consists of several parts and is integrated with the ignition system of a vehicle The foremost parts of a CDI include the stator, charging coil, hall sensor, flywheel, and timing mark

The flywheel is a large horseshoe permanent magnet rolled into a circle that turns-ON the crankshaft The Stator is the plate holding all of the electrical coils of wire, which is used to power ON the ignition coil, bike’s lights, and battery charging circuits

The charging coil is one coil in the stator, which is used to produce 6 volts to charge the capacitor C1 Based on the flywheel’s movement the single pulsed power is produced and is supplied to the sparking plug by the charging coil to ensure the maximum spark

The Hall Sensor measures the Hall effect, the instantaneous point where the flywheel’s magnet changes from a north to a south pole When the pole change occurs, the device sends a single, tiny pulse to the CDI box which triggers it to dump the energy from the charging capacitor into the high voltage transformer

The timing mark is an arbitrary alignment point shared by the engine case and stator plate It indicates the point at which the top of the piston’s travel is equivalent to the trigger point on the flywheel and stator

• Working Principle of the CDI

The fuel in the electronic control engine is stored at the pressure in the cylinder or 'connected' with the engine's fuel injector through the individual tubes to become a common path for all the Metal Fuel pumps control the pressure In addition, fuel injectors also operate in parallel with fuel pumps to control fuel spraying time and spraying fuel

In contrast, the previous mechanical systems are based on fuel pumps that control pressure, time, and fuel Another advantage of the CDI engine is that the fuel sprays directly into the combustion chamber The indirect injection system (IDI) in the old engines pumps fuel into the auxiliary chamber first, then put it into the main combustion chamber

1.2 Define and structure of TDI • Define the TDI

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TDI (Turbocharged Direct Injection) is Volkswagen Group's term for its current common rail direct injection turbodiesel engine range that has an intercooler in addition to the turbo compressor

TDI engines are used in motor vehicles sold by the Audi, Volkswagen, SEAT, and Skoda marques, as well as boat engines sold by Volkswagen Marine and industrial engines sold by Volkswagen Industrial Motor

The first TDI engine, a straight-five engine, was produced for the 1989 Audi 100 TDI sedan In 1999, common rail fuel injection was introduced, in the V8 engine used by the Audi A8 3.3 TDI Quattro From 2006 until 2014, Audi successfully competed in the LMP1 category of motor racing using TDI engine-powered racing cars

• Structure of the T DI

TDI engines have aluminum or cast iron cylinder blocks The cylinder heads are made of aluminum A belt is usually used in the valve timing mechanism, but there are also versions that use a chain or gears Depending on the engine version, the fuel system features a high-pressure pump, unit injectors, or a fuel rail A variable-geometry turbocharger is installed on many cars instead of a regular one There are also twin-turbo versions, some of which are called BiTDI

Main features - a turbine, equipped with a TDI engine This mechanism, provides forced airflow, thereby increasing engine torque and power But unlike other engines, the 2.0 TDI has a special turbine design - a variable geometry This design allows adjustment of the magnitude and direction of the exhaust flow This allows for a significant increase in power and better fuel economy Thus, with two liters of volume, you can get up to 170 horsepower A direct fuel injection system, thanks to fuel consumption of about 5.5 liters in the combined cycle

Recent changes have been made to the exhaust flow rate This is done by adjusting the magnitude of the cross-channel section Therefore, the blade can rotate around its axis at a certain angle This action is performed by control mechanisms It consists of a lever and a ring The tripping mechanism provides a vacuum actuator A vacuum actuator has a pressure-boosting valve limiter It is connected to the electronic engine control system The mechanism of action is based on the magnitude of the rising pressure and the inlet air temperature

• Working Principle of the TDI

TDI stands for Turbocharged Direct Injection Direct injection is when fuel is sprayed directly into a car's cylinder rather than delivered through an intake manifold Direct-injection diesel engines tend to be more efficient and produce less soot than older types of engines

Fuel needs oxygen to burn and the engine has to be supplied with huge quantities of air to get enough You can solve this problem with a bigger engine – or you can solve it with a turbocharger as in the TDI Driven by exhaust gases, – it squeezes air more tightly into the cylinders After being drawn through the turbocharger the air is then cooled by passing it through an air-to-air intercooler (cool air takes up less space than hot air), before entering the combustion chamber where diesel is injected directly into the cylinders at very high pressure through a nozzle It’s this intensive mixing of highly atomized fuel with the cooled compressed air that leads to better, more efficient combustion

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Chapter 2

THE BENEFITS AND DRAWBACKS

2.1 The benefits and drawbacks of the CDI engine • The benefits

The major advantage of CDI is that the capacitor can be fully charged in a very short time (typically 1ms) So the CDI is suited to an application where insufficient dwell time is available

The capacitor discharge ignition system has a short transient response, a fast voltage rise (between 3 to 10 kV/ µs) compared to inductive systems (300 to 500 V/ µs), and a shorter spark duration (about 50-80 µ s)

The fast voltage rising makes CDI systems unaffected to shunt resistance

• The drawbacks

The capacitor discharge ignition system generates huge electromagnetic noise and this is the main reason why CDIs are rarely used by automobile manufacturers

The short spark duration is not good for lighting relatively lean mixtures as used at low power levels To solve this problem many CDI ignitions release multiple sparks at low engine speeds

2.2 The benefits and drawbacks of the TDI engine • The benefits

Turbocharged direct injection engines come with plenty of benefits for the automobile

TDI offers a huge boost to your automobile’s engine so it can reflect the rapid gear changes that you enjoy in a regular gasoline car

There is a reduction in pollution caused by diesel engines This is mostly due to the contemporary advancements in the engine and particularly the addition of exhaust gas recirculation—a unit installed specifically for this purpose

Reduction in CO2 emissions with the help of catalytic converters

Despite the added benefits of a TDI engine, they are fairly lower in fuel costs as compared to most counterparts

• The drawbacks

TDI engines tend to be costlier when it comes to maintenance

It also tends to produce harmful gases like Nitrous Oxide Although not in a very big amount, even a minute portion of NOx can be detrimental

2.3 The comparison • The CDI engine

- Uses a high-pressure fuel injection system for efficient fuel delivery

- Fuel economy

- CDI is complex and thereby expensive to service and maintain

- CDI system can control the flow of fuel in accordance with the load and speed of the engine.

• The TDI engine

- Uses a turbocharger for exhaust gas recirculation to improve efficiency

- Compact design

- TDI is simple and relatively cheaper to maintain

- Increasing fuel mixture “quality” that can be injected and combusted

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CONCLUSION

The Direct Injection Engine was considered to be the savior of diesel, and there has been a growing market for TDI diesel cars and CDI diesel cars These cars are perhaps the most interesting in their creation, as they attempt to get the benefits of a gasoline engine, including fuel efficiency and engine power, without sacrificing the low-cost fuel and environmental importance of diesel The CDI and TDI are important to car makers as it offers them the chance to produce a car that does not lack performance power However, as with any other environmental technology, there are many pros and cons to producing and using CDI or TDI diesel cars

REFERENCES

1 carsdirect.com, TDI Diesel Cars: Pros and Cons of Turbocharged Direct Injection (1/2012), from https://www.carsdirect.com/car-buying/tdi-diesel-cars-pros-and 4 Nguyen Thi Thanh Huyen, Những ki n thế ức về động cơ diesel CRDI, CDI, bạn đã

biết? (3/2021), from https://ibg.com.vn/nhung-kien-thuc-ve-dong-co-diesel-crdi -cdi-ban-da-biet/