Regulations involving diesel engine emissions have become increasingly stringent, yet customers’ demands for quieter engines with improved power output has led the world’s leading firms in fuel injection technologies to invest in extensive research and development. Due to concerns regarding diesel engine emissions, Piezo Diesel Injectors have been developed to address this issue. It's possible they use HDEV4 on 458 instead, also with 200 bar fuel pressure.Alongside economic growth and societal progress, society today rightfully places greater emphasis on environmental sustainability. So the focus will be on full throttle power and fuel consumption while with roadcars the focus is on part throttle fuel consumption and emissions.įerrari California is also using the HDEV5 with 200 bar fuel pressure. Most of the time is spent on full throttle, approx 60%, which is followed by off throttle conditions for about 20% of the time. Part throttle is more like less than 20% of the time. One has to assume that new developments are afoot to make injection faster and expand the stratification range from what was possible in 2005. The first commercial application was the Mercedes CLS 350 CGI which appeared in 2006. One should keep in mind that the this second generation gasoline direct injection technology is now almost 6 years old. Richard van Basshuysen - Gasoline Engine with Direct Injection It has a bunch of drawings of the HDEV4 and HDEV5 injectors and the high pressure pumps by Bosch and Siemens. The following book is the best I have found so far on the Bosch injection technology. 40% of the race which could lead to significant fuel savings in a fuel capped formula. F1 cars are also in partial load mode for appr. I hope they will be able to even improve on the data they got now. Outward operation require a piezo actuator or two solenoids and HDEV5 only got one solenoid.Īs Ferrari are using 200 bar piezo injectors (probably outward opening) for the 458 Italia V8 I would expect F1 to use no inferior product. The solenoid version use inward opening and the piezo version use outward opening. They are considered second generation direct injection systems introduced a few years ago. HDEV4 is the piezo version (not listed on their website). Passenger car engines are focused on part load and here the use of stratified injection can lead to significant fuel savings.Įdis wrote:HDEV5 can be used with up to 200 bar fuel pressure. Motorsport requirement will differ somewhat from production engines as racing engines operate with a homogenous mixture during high load and speed where mixture preparation is important. Outward operation require a piezo actuator or two solenoids and HDEV5 only got one solenoid. HDEV5 can be used with up to 200 bar fuel pressure. Hopefully higher developed injectors will significantly improve on this. But it is good to learn that less efficient technologies already give 5% fuel use reduction compared to port injection in motorsport. It is unsuitable for spray guided direct injection. It uses 100 bar injection pressure and it is inward opening. WhiteBlue wrote:The Bosch injector is at least one generation behind. I hope that other engineers who are interested in direct injection will add more interesting references and perhaps also their own insights into the challenge of direct injection for F1 engines. This public section of an English language book looks also into HCCI. The book gives an excellent introduction into the state of the art three years ago and helps very much with understanding the concepts of wall guided, air guided or spray guided direct injection combustion. This is the public section of a German language report estimating the fuel saving potential of various injection technologies. Here are some sources which I thought I share:Ĭovers a new solenoid driven outward opening injector generation made by Delphi for spray guided stratified combustion which will become available in the next year. I have recently searched online for specific information on injector technologies that can be used for direct injection for F1 engines.
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