CONTROL SYSTEM FOR CONSTRUCTION MACHINE
First Claim
1. A control system for a construction machine having a plurality of items including an engine (1), a hydraulic pump (2) driven by the engine, an actuator (4) driven by a hydraulic fluid discharged from the hydraulic pump, and a member driven by the actuator, at least one of the items being selectively changeable from one item state to another, the control system comprising:
- item state selection means for selecting one of a plurality of item states; and
engine revolution speed/pump torque setting change means for changing the setting of an engine revolution speed and the setting of a pump torque in accordance with the item state selected by the item state selection means.
1 Assignment
0 Petitions
Accused Products
Abstract
A fuel-efficient hydraulic fluid has a lower viscosity than a standard hydraulic fluid, a pressure loss decreases, and thus, when control based on a standard model is exercised, the speeds of various actuators increase. However, the speeds need not be increased beyond the speeds of the standard model. Instead, it is preferred that fuel efficiency be improved. As a result, an engine revolution speed decreases by 50 rpm and a pump torque decreases by 5%. This reduces an engine output. Therefore, when a hydraulic fluid is changed from the standard hydraulic fluid to the fuel-efficient hydraulic fluid, the fuel efficiency can be improved while maintaining operability equivalent to that of the standard model. Hence, the fuel efficiency can be improved while maintaining the operability when an item affecting the fuel consumption is replaced. In addition, the settings can be changed with ease by a service technician.
-
Citations
8 Claims
-
1. A control system for a construction machine having a plurality of items including an engine (1), a hydraulic pump (2) driven by the engine, an actuator (4) driven by a hydraulic fluid discharged from the hydraulic pump, and a member driven by the actuator, at least one of the items being selectively changeable from one item state to another, the control system comprising:
-
item state selection means for selecting one of a plurality of item states; and engine revolution speed/pump torque setting change means for changing the setting of an engine revolution speed and the setting of a pump torque in accordance with the item state selected by the item state selection means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
Specification