The History of Caterpillar Engines

1170 words 5 pages
The History of Caterpillar Engines
The start of Caterpillar engines actually begins before Caterpillar was even a company. The history began back in the late1800’s when Daniel Best and Benjamin Holt were experimenting with various forms of steam tractors used for farming. The two competed with each other to gain the lead in the farm equipment industry. Throughout the late 1800’s and early 1900’s Holt and Best continued to build both steam and gas tractors. In 1908 Best sold his company to Holt.
In 1925 Holt Manufacturing and C. L. Best Gas Tractor, a company owned by Best’s son C. L. Best, merged to form Caterpillar Tractor Company. Three years later C. L. Best met with Carl George Arthur Rosen to discuss putting diesel engines in
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Coolant from the water pump flows through the aftercooler core. The compressed air is then passed along the outside of the core. The coolant takes the heat away from the air which lowers the air temperature causing it to become denser.
The third and final type of aftercooler is the Separate Circuit Aftercooler (SCAC). A separate cooling circuit used to cool the compressed air. The circuit has its own water pump, lines, and heat exchanger for the aftercooler. This system is very similar to the jacket water system.
After the increase in air volume engineers had to develope a more efficient fuel system to keep up. The old pump and nozzle groups, which had mechanical fuel injectors, used a small camshaft and individual plungers to supply fuel. This system was OK but couldn’t supply enough fuel for the amount of air going into the engine. This need led to the creation of a couple different types of fuel systems.
The first type of system was an electronically controlled unit injection system. This system used a solenoid on the injector to control the rate of injection. The solenoid is controlled by the Electronic Control Module (ECM). The actually injection timing is still controlled by a lobe on the camshaft.
The second type of system is the Hydraulically Actuated Electronically Controlled Unit Injector (HEUI). The HEUI system controls injection pressure electronically. The injector uses hydraulic energy from pressurized engine lube oil for injection.

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