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AssigneeOklahoma State University
InventorsRobert L. Woods, Karl N. Reid, Jr., Rajamouli Gunda
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This invention describes a system of control for a power source-transmission-load system such as might be used on an off-the-road vehicle, for example. The power source is an internal combustion engine having a known optimum characteristic of desired manifold vacuum versus engine speed. The transmission is a hydrostatic or hydromechanical transmission having infinitely variable speed ratio and having a control means for varying said speed ratio. The control system includes a transducer means for measuring engine speed and converting this quantity into an analog fluid pressure proportional to the speed. This analog fluid pressure proportional to speed is modified in a function generator to produce an analog fluid pressure which is proportional to the desired manifold vacuum as a function of engine speed. Means are provided for measuring the actual manifold vacuum and for comparing the actual manifold vacuum with the desired manifold vacuum on a continuous basis. This comparison produces an error signal which is amplified and used to control a hydraulic system to operate the control means in order to vary the transmission ratio of the hydrostatic or hydromechanical transmission to obtain a speed ratio such that will provide optimum engine conditions.
In a power source-variable speed-transmission-load system in which said power source is an internal combustion engine having a known characteristic of desired manifold vacuum vs. engine speed, said transmission is an infinitely variable transmission having infinitely variable speed ratio, and having a control means for varying said speed ratio, the improvement in automatic control systems for operating said engine at the proper speed for each load to obtain optimum system efficiency, comprising:
In a power source-variable speed-transmission-load system in which said power source is an internal combustion engine having a known characteristic of desired manifold vacuum vs. engine speed, said transmission is an infinitely variable transmission having infinitely variable speed ratio, and having a control means for varying said speed ratio, the improvement in automatic control systems for operating said engine at the proper speed for each load to obtain optimum system efficiency, comprising:
Dependencies are inferred from the claim text.