Yup, your fuel injected lawnmower just jumped up $200 in price. I can't wait. The skies will be so much clearer after this is done. Just like they will be cleaner after they took 700,000 "clunkers" off the road. I should have been from Missouri.
Operational endurance specs? Bah! Most short-lived engines are made in China these days, and the pollution over there is several magnitudes higher than what Briggs puts out. If Congress wanted to have a maximum impact on pollution, they'd require China to comply.
The errors I saw in the article are the spelling issue, the claim that the new approach would eliminate the spark plug, crank position sensor and fuel injectors...that's simply incorrect. If it's gasoline engines we are talking about, they are spark ignited, therefore we will always have a spark plug. Without a distributor we would need a crank position sensor to time the ignition events and fuel delivery events. The fuel injectors are taking the place of the carburetor (or Carburettor) for all intents and purposes. Plus, we will need a high pressure fuel pump to feed the injector(s). Current small engines typically do not use a fuel pump. In the end, I suspect this will increase the cost of lawnmowers considering all the sensors, the injector(s) and the addition of a high pressure fuel pump etc. The upside is that these small engines will be more efficient.
I am very pleased to see such socially responsible work from Freescale, though getting rid of the spark plug, as your editorial claims, will take something more, also I would think they are introducing crank angle sensors and fuel injectors, not getting rid of them. The fuel pump too, will be new, as well as the sensors.
glow plugs? model engines? anyone with any experience of these will know they have a horrific fuel consumption combined with huge power to CC ratio. The glow plug is only there to start the engine and warm it up once running it is replaced by the high compression ratio and hot carbon based deposits on the cylinder head. sort of a cross between diesel and two stroke. That aside I do not think anyone would want a scaled version of a model engine in their neighbour hood, the normal ones make more than enough noise.
Regards the spelling, depends on your view of the world and who invented the fuel - air, ratiometric mixing device as to how it is spelt. According to word, UK english is spelt with 2 Ts Carburettor.
Must be an American thing but most scooters are 1 cylinder 2 or 4 stroke in the EU the figure shows a schematic for a 4 stroke DOHC model which I am also pretty sure is a rariety along with the inclined angle on any EU scooters. I think he is talking small bore engines in general. The resistance to change to complex ECU topology in these applications is simple. The exisiting technology is simple, well proven, few part counts, small number of intreconnects etc. Have a read at mil HDBK 217 to see why the old designs have been around for so long.
The word is carburetor, not carburator as repeatedly mis-spelled. Also, the sentence "The MC33812 chip also allows small engine manufacturers to eliminate spark plugs, carburator and distributors for spark coils, fuel injectors and the crank-position sensor." makes no sense. You've traded a carburetor for fuel injectors, and a distributor (or "magneto" in most 1-cylinder engines) for a position sensor and electronically-driven coil or coils. The spark plug is a given either way - unless you're talking glow-plug as in model-scale engines.
Blog Doing Math in FPGAs Tom Burke 13 comments For a recent project, I explored doing "real" (that is, non-integer) math on a Spartan 3 FPGA. FPGAs, by their nature, do integer math. That is, there's no floating-point ...