LOAD-MEASURING, FLEET ASSET TRACKING AND DATA MANAGEMENT SYSTEM FOR LOAD-LIFTING VEHICLES
First Claim
1. A system for monitoring payload for a load-lifting vehicle, the vehicle having a lifting arm and a hydraulic actuator operatively connected to the lifting arm, the system comprising:
- means for correlating actuator pressure within the actuator at a set position of the lifting arm with a known weight for generating a calculated weight of a payload;
means for generating a payload pattern relating actuator pressure to time as the lifting arm moves the payload through a load cycle; and
means for comparing the payload pattern with a known, set pattern relating pressure to time corresponding to said calculated weight of the payload and storing the calculated weight of the payload into memory if the deviation between the patterns is equal to or less than a certain amount.
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Accused Products
Abstract
There is provided a system for monitoring payload for a load-lifting vehicle. The vehicle has a lifting arm and a hydraulic actuator operatively connected to the lifting arm. The system has a means for correlating actuator pressure within the actuator at a set position of the lifting arm with weight for generating a calculated weight of a payload. The system has a means for generating a payload pattern relating actuator pressure to time as the lifting arm moves the payload through a load cycle. The system has a means for comparing the payload pattern with a set pattern relating pressure to time corresponding to said calculated weight of the payload and storing the calculated weight of the payload into memory if the deviation between the patterns is equal to or less than a certain amount.
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Citations
23 Claims
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1. A system for monitoring payload for a load-lifting vehicle, the vehicle having a lifting arm and a hydraulic actuator operatively connected to the lifting arm, the system comprising:
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means for correlating actuator pressure within the actuator at a set position of the lifting arm with a known weight for generating a calculated weight of a payload; means for generating a payload pattern relating actuator pressure to time as the lifting arm moves the payload through a load cycle; and means for comparing the payload pattern with a known, set pattern relating pressure to time corresponding to said calculated weight of the payload and storing the calculated weight of the payload into memory if the deviation between the patterns is equal to or less than a certain amount. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 12, 13, 14, 15, 16, 17, 18, 19, 22)
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9-11. -11. (canceled)
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20. A payload monitoring system for a load-lifting vehicle having a lifting arm and a hydraulic actuator operatively connected to the lifting arm, the system comprising:
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means for determining a calculated weight of a payload when the payload is stationary; means for generating and storing a plurality of set patterns relating actuator pressure to time as the lifting arm moves through a load cycle for a plurality of loads of known weights moved through the load cycle under a plurality of rates of flow of hydraulic fluid passing into and out of the actuator; and means for generating a payload pattern relating actuator pressure to time as the lifting arm moves the payload through the load cycle and verifying the calculated weight of the payload with one of the set patterns generated from both a load of known weight corresponding to said calculated weight of the payload and a rate of flow of hydraulic fluid passing into and out of the actuator corresponding to that at which the payload was moved through the load cycle. - View Dependent Claims (23)
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21. A method of monitoring payload for a load-lifting vehicle, the vehicle having a lifting arm and a hydraulic actuator operatively connected to the lifting arm, the method comprising:
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hydraulically connecting a transducer to the actuator for sensing pressure therein, the transducer converting said pressure into electrical signals related thereto; positioning the lifting arm in an unloaded state to a set position and determining a first signal from the transducer in the set position; disposing a load of known weight on the lifting arm, determining a second signal from the transducer while the lifting arm is in the set position, and correlating a relationship between the first signal and the second signal and weight on the lifting arm therefrom; positioning a payload on the lifting arm, determining a third signal from the transducer while the lifting arm is in the set position, and determining a calculated weight of the payload based on said relationship; moving the payload through a load cycle at a rate of flow of hydraulic fluid passing into and out of the actuator where the payload is lifted a distance from the set position, measuring signals of the transducer at a series of points along the load cycle, generating a payload pattern based on said series of points, and comparing the payload pattern with a set pattern corresponding to said calculated weight of the payload and said rate of flow of hydraulic fluid; and repeating the above steps if the deviation between the payload pattern and the set pattern is greater than a certain amount.
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Specification