Douglas E Longman

Title: Innovations of Douglas E Longman

Introduction

Douglas E Longman is an accomplished inventor based in Naperville, IL (US). He holds a total of 2 patents that showcase his expertise in fuel injection systems. His work has significantly contributed to advancements in hydraulic actuation technology.

Latest Patents

One of his latest patents is the "Fill metered hydraulically actuated fuel injection system and method of." This invention utilizes an actuation fluid, preferably lubricating oil, as its actuation medium, which is separate from the fuel fluid injected into the engine. The injectors are hydraulically actuated and include a conventional VOP type needle check. Fuel is pressurized by a plunger driven by an intensifier piston, ensuring an abrupt end to each injection event. This is achieved through a pressure relief passage in the plunger that quickly dissipates residual fuel pressure, allowing the needle check to close more rapidly. Additionally, fuel is metered into the injector by biasing the plunger with a return spring or by pressurizing the fuel to hydraulically push the plunger in a retracting direction between injection events.

Another significant patent is the "Hydraulically-actuated electronically-controlled unit injector." This invention addresses the variations in viscosity of the actuating fluid, which can affect pressure drops in the actuating fluid circuit. The improved design compensates for these variations, ensuring optimal fuel delivery during engine startup and normal operation. The stroke of the piston is controlled electronically and/or mechanically to achieve the appropriate amount of fuel injection.

Career Highlights

Douglas E Longman is currently employed at Caterpillar Inc., where he continues to innovate and develop advanced fuel injection technologies. His contributions have been instrumental in enhancing the performance and efficiency of engine systems.

Collaborations

Throughout his career, Douglas has collaborated with notable colleagues, including Thomas G Ausman and Alan Ray Stockner. These partnerships have fostered a creative environment that encourages innovation and the sharing of ideas.

Conclusion

Douglas E Longman is a prominent inventor whose work in hydraulically actuated fuel injection systems has made a significant impact in the field. His patents reflect a commitment to advancing technology and improving engine performance.