Torque limit control
First Claim
1. A method of managing power in a mechanical power system, the method comprising:
- developing a first pressure in a first hydraulic circuit using a first hydraulic pump driven by a power generation apparatus;
developing a second pressure in a second hydraulic circuit using a second hydraulic pump driven by the power generation apparatus;
calculating a torque of the first hydraulic pump based on the first pressure;
calculating an allowable pressure in the second hydraulic circuit based on a torque capacity of the power generation apparatus and the torque of the first hydraulic pump; and
venting the second hydraulic circuit when a pressure in the second hydraulic circuit reaches the allowable pressure.
2 Assignments
0 Petitions
Accused Products
Abstract
A prime mover transfers power to a separate hydraulic circuits via a power take off (PTO). In some situations, a peak torque demand in one of the hydraulic circuits may cause the total torque of all hydraulic circuits to exceed a rated torque at the PTO. An apparatus measures hydraulic fluid pressure in a first hydraulic circuit and adjusts the hydraulic fluid pressure in a second hydraulic circuit. Because pressure is directly correlated to torque at a pump, by adjusting the pressure in the second circuit based on the current pressure in the first hydraulic circuit, the total torque may be capped below the maximum torque rating at the PTO. The first hydraulic circuit may have a higher priority function, such as steering, compared to that of the second hydraulic circuit which may, for example, power a tool.
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Citations
6 Claims
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1. A method of managing power in a mechanical power system, the method comprising:
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developing a first pressure in a first hydraulic circuit using a first hydraulic pump driven by a power generation apparatus; developing a second pressure in a second hydraulic circuit using a second hydraulic pump driven by the power generation apparatus; calculating a torque of the first hydraulic pump based on the first pressure; calculating an allowable pressure in the second hydraulic circuit based on a torque capacity of the power generation apparatus and the torque of the first hydraulic pump; and venting the second hydraulic circuit when a pressure in the second hydraulic circuit reaches the allowable pressure. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification