Car GPS navigation System

noreply@blogger.com (thanuja) — Tue, 31 Mar 2009 00:01:00 -0700

Car GPS System

A Car GPS System is meant for navigational use while driving. A car GPS system typically features a big display screen so that it is easy to read without taking your eyes off the road for long. Such a GPS device does not have its own power supply but uses that of the vehicle. Newer vehicles usually have built-in car GPS systems, thus doing away with the need to buy another car GPS device.

Car GPS systems have a street mapping feature, which offers you directions to your intended destination. Auto GPS units are not as light or as compact as handheld systems and usually cost a little more. A basic car GPS system can be obtained for about $200-$250.

Basic EFI system

noreply@blogger.com (thanuja) — Mon, 2 Mar 2009 20:13:00 -0800

System Basics

It is important to familiarize yourself with the basic EFI mechanical components and function to be able to understand why certain things need to be a certain way. All EFI systems use a high pressure pump to supply fuel to the injectors. This is almost always electrically driven. Most systems run between 35 and 45 psi. Fuel is supplied to fuel rails or a fuel block which is connected to the injectors. The other end of the fuel rail or block is connected to a fuel pressure regulator. Its function is to hold the fuel pressure at a constant differential above the intake manifold pressure. It does this by returning unused fuel back to the fuel tank. The pump always puts out a constant volume of fuel and more than the engine requires at full throttle so most of the fuel is returned back to the tank under idle and low power conditions. Below is a proven fuel system used in racing cars which undergo high G forces. The system for aircraft is a variation of this and has also been flight proven in our RV6A and others.

EFI engine

noreply@blogger.com (thanuja) — Wed, 25 Feb 2009 21:27:00 -0800

Fuel injection is a system for mixing fuel with air in an internal combustion engine. It has become the primary fuel delivery system used in gasoline automotive engines, having almost completely replaced carburetors in the late 1980s. The first use of direct gasoline injection was on the Hesselman engine invented by Swedish engineer Jonas Hesselman in 1925.[1][2]

A fuel injection system is designed and calibrated specifically for the type(s) of fuel it will handle. The majority of fuel injection systems are for gasoline or diesel applications. With the advent of electronic fuel injection (EFI), the diesel and gasoline hardware has become similar. EFI's programmable firmware has permitted common hardware to be used with multiple different fuels. For gasoline engines, carburetors were the predominant method to meter fuel before the widespread use of fuel injection. However, a wide variety of injection systems have existed since the earliest usage of the internal combustion engine.

The primary functional difference between carburetors and fuel injection is that fuel injection atomizes the fuel by forcibly pumping it through a small nozzle under high pressure, while a carburetor relies on low pressure created by intake air rushing through it to add the fuel to the airstream.

The fuel injector is only a nozzle and a valve: the power to inject the fuel comes from farther back in the fuel supply, from a pump or a pressure container

History and development

1896 E.J. Pennington had detailed a crude form of fuel injection in the patent for his motorcycle (U.S. patent 574262).[citation needed]. Herbert Akroyd Stuart developed the first system laid out on modern lines (with a highly-accurate 'jerk pump' to meter out fuel oil at high pressure to an injector. This system was used on the hot bulb engine and was adapted and improved by Robert Bosch for use on diesel engines- Rudolf Diesel's original system using a cumbersome and less efficient 'air-blast' system using highly compressed air.

Fuel injection was in widespread commercial use in diesel engines by the mid-1920s. Because of its greater immunity to wildly changing g-forces on the engine, the concept was adapted for use in gasoline-powered aircraft during World War II, and direct injection was employed in some notable designs like the Daimler-Benz DB 603, the BMW 801, the Shvetsov ASh-82FN (M-82FN) and later versions of the Wright R-3350 used in the B-29 Superfortress.

One of the first commercial gasoline injection systems was a mechanical system developed by Bosch and introduced in 1955 on the Mercedes-Benz 300SL. This was basically a high pressure diesel direct injection pump with an intake throttle valve set up. (diesels only change amount of fuel injected to vary output, there is no throttle). This system used a normal gasoline fuel pump, to provide fuel to a mechanically driven injection pump, which had separate plungers per injector to deliver a very high injection pressure directly into the combustion chamber. When combined with Desmo valves in racing the 300 SL was capable of over 100 horsepower per liter, still better than what's commonly possible today without a turbo.

Another mechanical system, also by Bosch, (CIS) but injecting the fuel into the port above the intake valve was later used by Porsche from 1969 until 1973 for the 911 production range in the USA and until 1975 on the Carrera RS 2.7 and RS 3.0 street models in Europe. Porsche continued using it on its racing cars into the late seventies and early eighties. Porsche racing variants such as the 911 RSR 2.7 & 3.0, 904/6, 906, 907, 908, 910, 917 (in its regular normally aspirated or 5.5 Liter/1500 HP Turbocharged form), and 935 all used Bosch or Kugelfischer built variants of injection. The Kugelfischer system was also used by the BMW 2000/2002 Tii and some versions of the Peugeot 404/504 and Lancia Flavia. Lucas also offered a mechanical system which was used by some Maserati, Aston Martin and Triumph models between ca. 1963 and 1973. The first factory electronic fuel injection, a true multi-point system, with dual 2-bbl. throttles, was optional on 1958 Chrysler products, both Hemi and wedge engines. It was jointly engineered by Chrysler and Bendix.

A system similar to the Bosch inline mechanical pump was built by SPICA for Alfa Romeo, used on the Alfa Romeo Montreal and on US market 1750 and 2000 models from 1969 until 1981. This was specifically designed to meet the US emission requirements, and allowed Alfa to meet these requirements at no loss in performance and with a reduction in fuel consumption.

Computer Cars

Car GPS navigation System

Basic EFI system

EFI engine