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Optimization of Fuel Delivery Variation in PF Conventional Pump

Maruti Talawar1Subbaiah.K.M2 and Prasad Raghuveer3
  1. Department of Industrial & Production Engineering, The National Institute of Engineering, Mysuru, India
  2. Dept. of Quality Management & Methods, Bosch Ltd., Adugodi, Bengaluru, Karnataka, India
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Abstract

Pump is the principle segment in the engine. The major problem identified is, the required fuel delivery is not optimized at the different speeds and the fuel delivery variation was more at the constant speed. The experimentation is conducted in a leading automobile industry to optimize this parameter. Utilizing critical thinking methodology, the major fuel delivery variation at 1800 RPM was observed. The fundamental goal of this work to optimize the fuel delivery variation and reduce the spread. The root cause is carried out utilizing advanced Shainin Technique and Design of Experiments (DOE)

Keywords
Engine,Fueldelivery,TimerGrooveDepth,Shainin,DOE

INTRODUCTION
Diesel engines are known for higher efficiency engines and as well as have become the most popular power packs for low duty vehicles and equipments such as three wheeler, tractors, passenger vehicles, and so forth as the diesel fuel is a standout amongst the most productive and vitality fuels accessible today. Engine running at lower RPM‟s has numerous advantages. The obvious of these is reduced fuel consumption, since the engine can spend more time running within optimum efficiency range. Diesel Fuel Injection Pump (DFIP) System- the heart of the diesel engine is one such critical system.
The fuel-injection system is the most vital component in the working of CI engine. The engine performance (power output, efficiency) is greatly dependent on the effectiveness of the fuel injection system. It has the important duty of initiating and controlling the combustion process. Diesel fuel pump that delivers diesel to the engine cylinder in atomized form at moderate pressure. BPS is the pioneer in quality production by conveying propelled quality measures in its assembling courses of action and subsequently, fulfilling the customers. The root cause is observed through Shainin system and DOE.

TYPES OF DIESEL FUEL INJECTION PUMP
1.) Common Rail Fuel injection Pump
a. Normal Common Rail Fuel Injection Pump
b. Electronic Common Rail Fuel Injection Pump
2.) Distributor Fuel Injection Pump
3.) In-Line Fuel Injection Pump
4.) PF Pumps
a. K-Type PF Pump
b. Q-Type PF Pump
c. Monotype Block Pump
PF stands for “Pump with a Foreign drive”. In it the foreign drive is the plunger that pushes the diesel fuel forward to the pressurized delivery tube via normal delivery valve. PF pump is used in single cylinder diesel fuel engines.

1.2 Root cause analysis technique:
Shainin: Shainin is a simplest problem solving tool used to optimize the problem. The classification of the issue done to pick the best powerful strategies, for example, component search, paired correlation. Shainin is done in three steps. 1) Measurement validation. 2) Process validation. 3) Product validation.
DOE: Design of experiments (DOE) is a systematic procedure for designing, conducting and evaluating experiments while minimizing the necessary resources. For each response there are a few variables and a few levels. In this case torque is the response. DOE is carried out using the „level to power of factors‟.

1.3 Problem Definition:
image
Experiments are carried out on single bench to nullify the bench variation
Find and eliminate the RedX causing fuel delivery variation @1800 & @1100 rpm and optimize the variation. 1800 rpm variation is the priority task.

II. METHODOLOGY

2.1 Sample selection
image
Samples which are showing delivery above standard specification @1800 rpm is taken as Best of Best (BOB). Samples which are showing delivery below the standard specification @1800 rpm is taken as Worst of Worst (WOW).

2.2 Approach and solution tree:
image

2.3 Measurement validation
image
Measurement not the cause: No swapping takes place.

2.4 Process validation:
image
Process not the cause: No swapping takes place.

2.5 Product validation
image

2.6 Setting Layout change: 2.6.1 Previous calibration layout
image
According to previous setting point @1800 rpm, obtained only 5 mm3/str of delivery tolerance @ 800 rpm over checking point.

2.6.2 Current calibration layout
image
According to current setting point @800 rpm, obtained 7 mm3/str of delivery tolerance @1800 rpm over checking point.
It is understood that calibration layout influences on variation phenomenon.

III. RESULTS AND DISCUSSIONS
image

Significance of Timer Groove
If TGD is less, then proportionate delivery will not be achieved @1100 & 1800 rpm.
Whatsoever is TGD required delivery is achieved @800 rpm since it is adjusted by eccentric pin setting.
But achieved delivery @800 rpm is not by the true behaviour of FIP!
True behaviour of the pump and TGD proportionately effect is evident @1100 & 1800 rpm since annular fuel plays dominant effect on fuel delivery.
Hence, the difference in delivery (variation) found @ higher rpm.

3.1 TG Optimization:
image

3.2 Existing and proposed TGD
image
Major variations are contributed by extent of setting.
Extent of setting attributed to TGD
Optimized TGD = 0.07 mm has given close value to required delivery and very less extent of setting. Till certain depth (about 40μm) the effect of TG is not dominant; because, depth is very less and cannot induce timing difference (annular space is filled with fuel is as good as solid block) Higher the TGD, the annular fuel block decides surization starting according to rate of strokes(rpm) From experiments→50, 60, 70μm are the TGD which can induce required proportional delivery at different RPM‟s

IV. CONCLUSION
Purpose of timer groove is to impart the proportionate fuel delivery w.r.t rpm (rate of strokes) nevertheless having same CRP or Effective stroke.It is achieved through „Fuel Injection Timing Mechanics‟.Theory of fuel injection in FIP‟s with TG → TGD α 1/FM (@800 rpm).Optimum TGD gives better (less variation) proportional delivery @different rpm‟s
Myth: More the setting extent, more the variation.
Truth: Non-Optimum TGD, nom proportional delivery (high variation).Eccentric pin setting is not culprit, but it is the signal of inadequate TGD. But signal is neglected and abused by larger amount of setting.

References
  1. RathiVivek M, UpadhyayPinak N, “Performance Analysis on Bosch PF Diesel Fuel Injection Pump”,International Journal of Mechanical AndProduction Engineering, Volume- 2, Issue-9, Sept.-2014.
  2. Mohammad Javed, Prof. S.D. Ambekar, “Optimisation of Fuel Injection Pump Parameters of Tata 1613 & Tata 609Engine Using Diesel & Biodiesel”, International Journal of Engineering Research and Applications (IJERA), Vol. 3, Issue 4, Jul-Aug 2013.
  3. Dr. Arakerimath, R. Rachayya, “Parametric analysis and optimization of fuel delivered and Torque by FIP of Diesel Engine using GeneticAlgorithm”, International Journal of Engineering Research and Applications (IJERA), Vol. 2, Issue 3, May-Jun 2012.
  4. Bhaskara P, Raghuveer Prasad, “Root Cause Analysis of Control Rod Friction Problem in DFIP Using Shainin® Approach”, InternationalJournal of Mechanical Engineering and Technology (IJMET), Volume 5, Issue 9, September (2014).
  5. Robert Bosch Gmbh, Bosch Automotive Handbook. .