Editing Stratified charge engine (section)

===Hesselman===

An early example of gasoline direct injection was the [[Hesselman engine]] invented by Swedish engineer [[Jonas Hesselman]] in 1925. Hesselman engines used the ultra lean burn principle and injected the fuel in the end of the compression stroke and then ignited it with a spark plug, it was often started on gasoline and then switched over to run on diesel or kerosene. The Texaco Controlled Combustion System (TCCS) was a multifuel system developed in the 1950s which closely resembled the Hesselman design. The TCCS was tested in UPS delivery vans and was found to have an overall increase in economy of about 35%.