Patent Dispute With Herbert Akroyd Stuart
Akroyd-Stuart's compression ignition engine (as opposed to spark-ignition) was patented two years earlier than Diesel's similar engine; Diesel's patentable idea was to increase the pressure. Due to the lower pressures used, the hot bulb engine, with an internal pressure of about 90 PSI, as opposed to the Diesel engine's c. 500 PSI, had only about a 12% thermal efficiency versus more than 50% for some large Diesels. Details of the claim that a patent submitted by Herbert Akroyd Stuart has pre-dated that of Rudolf Diesel may be found under the name of that inventor.
The high compression and thermal efficiency is what distinguishes the patent granted to Diesel from a hot bulb engine patent.
Read more about this topic: Rudolf Diesel
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