ENGINE OUTPUT CONTROL VIA AUTO SELECTION OF ENGINE OUTPUT CURVE
First Claim
1. An engine output controller for a motor grader, comprising:
- an output curve storage device which stores a plurality of output curves of an engine; and
an output curve changing device which selects a higher output curve from the output curve storage device when the motor grader is in a grading mode, and which selects a lower output curve from the output curve storage device when the motor grader is in a running mode;
wherein the engine output controller controls an output of the engine of the motor grader in accordance with the selected output curve.
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Accused Products
Abstract
An engine output controller provided in a bulldozer includes an output curve storage device storing a plurality of output curves of an engine and an output curve changing device selecting and shifting to one of the plurality of output curves. The output curve changing device, when a pressure of a blade tilt cylinder is equal to or more than a predetermined value, calls and shifts to a higher output curve from the output curve storage device. When an oil pressure is supplied to the tilt cylinder to tilt a blade and an operation is performed without reducing a soil pressing speed in this condition, the output curve changing device shifts the current output curve to the higher output curve to drive the engine. However, in many other cases, the output curve is automatically switched to a lower output curve to reduce an output of the engine. Thus, the fuel consumption is improved.
32 Citations
3 Claims
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1. An engine output controller for a motor grader, comprising:
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an output curve storage device which stores a plurality of output curves of an engine; and
an output curve changing device which selects a higher output curve from the output curve storage device when the motor grader is in a grading mode, and which selects a lower output curve from the output curve storage device when the motor grader is in a running mode;
wherein the engine output controller controls an output of the engine of the motor grader in accordance with the selected output curve. - View Dependent Claims (2)
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3. An engine output controller for a hydraulic excavator, comprising:
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an output curve storage device which stores a plurality of output curves of an engine; and
an output curve changing device which selects a higher output curve from the output curve storage device when the hydraulic excavator is both in a running mode and in a steering operation.
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Specification