The Hvid Patent.
It's not a Diesel!
Almost by default, compression ignition engines are called "Diesels".  In reality, the term "Diesel" more correctly describes a compression ignition engine with a particular method of direct injection. Diesel's working design used compressed air to inject the fuel into the cylinder. The high-pressure injection pumps common today did not come into use until the 1920's.  Up to that point the effort was to find a simple, lightweight means of getting fuel into the pressurized combustion chamber and as such, it's not difficult to determine the driving force behind Hvid's patent. Making compressed air means adding heavy machinery to an already heavy engine concept, not really a desirable condition.  Roll back the clock to 1904...
Jan Brons receives a German patent describing a spraying cup type injection in which a the fuel charge is partially ignited in a separate chamber and the resulting pressure forces the remaining fuel into the combustion chamber at the appropriate time.  This patent is the parent design from which the Hvid patent originates.1  Hvid purchased a Brons patent license in 1912 and altered the Brons design to allow its use in a horizontal engine. And so the story begins.  It's not a "Diesel", or a "Brons", it's a "HVID" dammit!
A 6 hp Thermoil at Portland, 2004.
Intake, Compression, Power and Exhaust. Four simple words that freed mankind from many of the toils of manual labor and let him move on to more productive, like perpetuating a political sytstem capable of destroying the very ideal this country was founded on.  But that is a philosphical discussion best continued elsewhere.  Seriously, the internal combustion engine is one of the most quietly important inventions of the industrial age.  Like the steam engine, it provided mechanical power far beyond what men or animals could generate.  But even steam had limitations similar to the care and feeding of animals, it has a voracious appetite for fuel and water.  Internal combustion rapidly acheived thermal efficiencies double that of the most modern steam engines of the time, and slowly the bond between the machine and the watering hole was broken.  Essentially, internal combustion was capable of producing greater horsepower without all the attention. It gave us the capability to design machines and processes that didn't require an army of men and auxiliary services to keep in operation.  If steam was the driving force behind the industrial revolution of the 1800's, internal combustion is the logical, more capable product of it.

Just how does this work anyway?  I guess it's time to figure this out.  First off, a few basic principles of compression ignition to get everyone in the mood.  I'll warn you now: I am an engineer .... by choice.

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References this Page:

1. The Brons Motor Website,

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