Automatic control means for infinitely variable transmission
First Claim
1. 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:
- a. transducer means to measure engine speed and generate a speed signal;
b. function generator means responsive to said transducer means to convert said speed signal to a signal which is a function of desired manifold vacuum;
c. means to measure actual manifold vacuum;
d. means to compare said desired with said actual manifold vacuum to obtain an error signal;
e. means to amplify said error signal; and
f. means responsive to said amplified error signal to operate said control means on said infinitely variable transmission to vary said speed ratio to reduce said error signal.
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Abstract
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.
65 Citations
8 Claims
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1. 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:
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a. transducer means to measure engine speed and generate a speed signal; b. function generator means responsive to said transducer means to convert said speed signal to a signal which is a function of desired manifold vacuum; c. means to measure actual manifold vacuum; d. means to compare said desired with said actual manifold vacuum to obtain an error signal; e. means to amplify said error signal; and f. means responsive to said amplified error signal to operate said control means on said infinitely variable transmission to vary said speed ratio to reduce said error signal. - View Dependent Claims (2, 3, 4, 5)
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6. 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:
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a. transducer means to measure engine speed and convert said engine speed to a fluid pressure speed signal proportional to said speed; b. function generator means responsive to said transducer means to convert said fluid pressure speed signal to a fluid pressure proportional to desired manifold vacuum; c. means to measure actual manifold vacuum; d. means to compare said desired with said actual manifold vacuum to obtain an error signal; e. means to amplify said error signal; and f. means responsive to said amplified error signal to operate said control means on said infinitely variable transmission to vary said speed ratio to reduce said error signal. - View Dependent Claims (7, 8)
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Specification