US 2011/0024654 A1Published application

Electro-hydraulic proportional flow valve speed regulating control system and its method

OwnerPeike Shiinventor

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Abstract

An electro-hydraulic proportional flow valve speed regulating control system includes a PWM regulating device, an electro-hydraulic proportional flow valve, a hydraulic executing element, a speed measuring module, an electro-hydraulic proportional flow valve characteristic measuring module, and a feedforward control module. The speed measuring module measures a speed of the hydraulic executing element and sends the measured result to the electro-hydraulic proportional flow valve characteristic measuring module which measures a minimum actuating current and a maximum actuating current of the electro-hydraulic proportional flow valve and a maximum speed of the hydraulic executing element and inputs these measured results to the feedforward control module. With these measured results, the feedforward control module establishes a corresponding relationship between the speed of the hydraulic executing element and the valve core current and inputs the valve core current in correspondence with the setting speed value to the PWM regulating device, thereby driving the electro-hydraulic proportional flow valve.

Claims6

Dependent claims

A speed regulating control system for an electro-hydraulic proportional flow valve, comprising:

a PWM regulating device;
an electro-hydraulic proportional flow valve;
and
a hydraulic executing element,
wherein the electro-hydraulic proportional flow valve and the hydraulic executing element are driven by a PWM signal from the PWM regulating device;
and
wherein the control system further comprises
a displacement/speed measuring module;
an electro-hydraulic proportional flow valve characteristic measuring module;
and
a feedforward control module,
wherein the displacement/speed measuring module measures at least one of a displacement and speed of the hydraulic executing element and sends this measured result to the electro-hydraulic proportional flow valve characteristic measuring module;
the electro-hydraulic proportional flow valve characteristic measuring module measures a minimum actuating current and a maximum actuating current of the electro-hydraulic proportional flow valve and a maximum speed of the hydraulic executing element and sends these measured results to the feedforward control module;
and the feedforward control module establishes a corresponding relationship between a movement speed of the hydraulic executing element and a valve core current by use of these measured results, and inputs a valve core current value in correspondence with a given speed value based on the corresponding relationship to the PWM regulating device so as to drive the electro-hydraulic proportional flow valve.

11 more elements

Dependencies are inferred from the claim text.

Facts

Application: 12/744,929Filed 17 Nov 2008
Priority: CN 200710168189.528 Nov 2007
Published: 3 Feb 2011
Term ends: Not estimatedThe source records don’t support an estimate.

Classification10 codes

F15B 19/002
Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for:…
G05B 11/28
In which the output signal is a pulse-train: using pulse-height modulation; using pulse-width modulation
G05B 13/042
Involving the use of models or simulators: in which a parameter or coefficient is automatically adjusted to optimise the performance
G05D 7/0635
Characterised by the type of regulator means: by action on throttling means