Fault detection, isolation and reconfiguration systems and methods for controlling electrohydraulic systems used in construction equipment
First Claim
1. A method of operating a control system for a hydraulic circuit in a vehicle comprising the steps of:
- a. receiving input signals from a plurality of sensors in the hydraulic circuit;
b. executing a first control algorithm to generate output signals to a plurality of control components in the hydraulic circuit, the first control algorithm incorporating at least some of the sensor input signals;
c. detecting a fault condition in the control system relating to a sensor or control component associated with the execution of the first control algorithm;
d. isolating the fault condition by identifying a faulty sensor or control component responsible for the fault condition; and
reconfiguring the controller to execute a second control algorithm instead of the first control algorithm, the second control algorithm excluding the input signal from the faulty sensor or control component.
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Accused Products
Abstract
The present disclosure relates to fault detection, isolation and reconfiguration schemes, architectures and methods for use in electrohydraulic actuation systems for construction equipment. In one embodiment, a supervisory controller adapted to interface with a main controller of the construction vehicle is provided. A plurality of control nodes that interface with the supervisory controller are also disclosed, each of which includes pressure and position sensors. The nodes also include a first actuator control node for controlling operation of a first hydraulic actuator, a second actuator control node for controlling operation of a second hydraulic actuator, and a pump control node. The control system has an architecture in which faults are detected and isolated at the supervisory controller level and, where possible, within each of the control nodes at a sensor level, a component level, and a subsystem level.
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Citations
22 Claims
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1. A method of operating a control system for a hydraulic circuit in a vehicle comprising the steps of:
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a. receiving input signals from a plurality of sensors in the hydraulic circuit; b. executing a first control algorithm to generate output signals to a plurality of control components in the hydraulic circuit, the first control algorithm incorporating at least some of the sensor input signals; c. detecting a fault condition in the control system relating to a sensor or control component associated with the execution of the first control algorithm; d. isolating the fault condition by identifying a faulty sensor or control component responsible for the fault condition; and reconfiguring the controller to execute a second control algorithm instead of the first control algorithm, the second control algorithm excluding the input signal from the faulty sensor or control component. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 14, 16, 17, 19, 21)
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12. A method of configuring a controller for a hydraulic system, the method comprising:
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a. defining a plurality of sensor inputs in the controller; b. defining a nominal control algorithm in the controller for operating the hydraulic system that relies upon the plurality of sensor inputs; c. defining a plurality of fault conditions in the control system, each fault condition having predefined parameters for allowing the controller to detect a fault in one of the plurality of sensor inputs; d. isolating a fault caused by one of the plurality of sensors upon the detection of the fault condition without interrupting execution of the nominal control algorithm; and e. defining a reconfigured control algorithm in the controller for replacing the nominal control algorithm when a faulty sensor is isolated by the controller, the reconfigured control algorithm excluding input from an isolated faulty sensor. - View Dependent Claims (15, 18, 20, 22)
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Specification