Method and apparatus configured to perform viscosity compensation for a payload measurement system

An apparatus configured to dynamically measuring a payload weight for a machine having at least one cylinder for elevating a payload carrier, the cylinder being connected to a fluid circuit having an actuating fluid, comprising:

• a pressure sensor configured to sense a pressure of the actuating fluid associated with the cylinder and responsively generating a pressure signal;
• an extension sensor configured to sense a characteristic indicative of an extension of the cylinder and responsively generating an extension signal;
• a temperature sensor configured to sense a temperature of the actuating fluid and responsively generating a temperature signal;
• and
• a controller configured to receive a plurality of said extension signal, and a plurality of said pressure signals, during a first lift of a first payload having a first payload weight, a second lift of a second payload having a second payload weight, and a third lift of a third payload having a third payload weight, receive at least one temperature signal during said first lift and said second lift, and receive a temperature signal during said third lift, and determine a weight of said third payload in response to said plurality of pressure signals, said plurality of extension signals, said at least one calibration temperature signal, said third lift temperature signal, said first payload weight and said second payload weight.

A method for dynamically measuring a payload weight for a vehicle having at least one cylinder for elevating a payload carrier, the cylinder being connected to a fluid circuit having an actuating fluid, comprising the steps of:

• lifting a first payload having a first payload weight;
• lifting a second payload having a second payload weight;
• establishing a first viscosity of the actuating fluid during at least one of said first and second lift;
• lifting a third payload having a third payload weight;
• sensing a first actuating fluid temperature of during said third lift;
• determining a change in said viscosity in response to said first fluid temperature;
• and determining said third payload weight in response to said first payload weight, said second payload weight, and said viscosity change.

A method for dynamically measuring a payload weight for a machine having at least one cylinder for elevating a payload carrier, the cylinder being connected to a fluid circuit having an actuating fluid, comprising the steps of:

• lifting a first payload having a first payload weight;
• sensing a first plurality of pressure values of the actuating fluid during said lifting of said first payload;
• lifting a second payload having a second payload weight;
• sensing a second plurality of pressure values of the actuating fluid during said lifting of said second payload;
• establishing a parameter indicative of a viscosity of the actuating fluid associated with said first lift and said second lift;
• lifting a third payload having a third payload weight;
• sensing a third plurality of pressure values of the actuating fluid during said lifting of said third payload;
• establishing a second parameter indicative of the viscosity of the actuating fluid associated with said third lift;
• and
• establishing a payload weight of said third payload in response to said first viscosity parameter, said second viscosity parameter, and said first and second and third plurality of actuating fluid pressure values, and said first and second payload weights.