Device and method for determining hydraulic unit output speed in hydraulic mechanical gearing means

A hydraulic unit and transmission technology, applied in transmission, transmission control, fluid transmission, etc., can solve the problems of low output speed, low speed pulse frequency, expensive directional Hall effect sensor and magnetic ring, etc.
CN1242192CInactive Publication Date: 2006-02-15DEERE & CO +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
DEERE & CO
Publication Date
2006-02-15
Estimated Expiration
Not applicable · inactive patent

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Abstract

The output speed of a hydrostatic unit in a transmission is determined using a pair of variable reluctance sensors, one on a gear driven by the hydrostatic unit output and the other on the carrier of the planetary system. One of the two sensors will always be measuring a relatively high speed from which the hydro output is directly determined or indirectly determined using the current engine speed. Thus the frequency of the speed sensor used to determine the hydrostatic unit output speed is not decreased at slow hydrostatic unit output speeds.
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Description

technical field

[0001] The present invention relates to a hydromechanical transmission with a hydraulic unit, in particular to a device and method for determining the actual output speed of the hydraulic unit. Background technique

[0002] The controller of the hydromechanical transmission device determines a given output speed for the hydraulic unit according to the change of the input index. For proper control, there needs to be a feedback of the achieved output speed of the hydraulic unit to the controller. Previously, such feedback has been achieved with a directional Hall effect sensor and a magnetic ring mounted on the output shaft of the hydraulic unit or on a gear driven by the output shaft of the hydraulic unit. A drawback of this approach is that the directional Hall effect sensor and magnetic ring are relatively expensive. Another disadvantage is that when the hydraulic unit is close to zero stroke, the frequency of speed pulses is low due to the low output spee...

Claims

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