Engine output controller
First Claim
1. An engine output controller (30) for a bulldozer (1), comprising:
- an output curve storage device (36) storing a plurality of output curves (N1, N2 and N3) of an engine (2); and
an output curve changing device (35) selecting and shifting to one of the plurality of output curves (N1, N2 and N3), wherein;
the output curve changing device (35), when a pressure of a blade tilt cylinder (12) is equal to or more than a predetermined value, calls and shifts to a higher output curve (N1) from the output curve storage device (36).
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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.
49 Citations
7 Claims
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1. An engine output controller (30) for a bulldozer (1), comprising:
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an output curve storage device (36) storing a plurality of output curves (N1, N2 and N3) of an engine (2); and
an output curve changing device (35) selecting and shifting to one of the plurality of output curves (N1, N2 and N3), wherein;
the output curve changing device (35), when a pressure of a blade tilt cylinder (12) is equal to or more than a predetermined value, calls and shifts to a higher output curve (N1) from the output curve storage device (36).
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2. An engine output controller (30) for a bulldozer (1), comprising:
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an output curve storage device (36) storing a plurality of output curves (N1, N2 and N3) of an engine (2); and
an output curve changing device (35) selecting and shifting to one of the plurality of output curves (N1, N2 and N3), wherein;
the output curve changing device (35) shifts the output curves corresponding to an operation mode. - View Dependent Claims (3)
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4. An engine output controller (30) for a bulldozer (1), comprising:
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an output curve storage device (36) storing a plurality of output curves (N1, N2 and N3) of an engine (2); and
an output curve changing device (35) selecting and shifting to one of the plurality of output curves (N1, N2 and N3), wherein;
the output curve changing device (35), when a shift position of a transmission (3) to transmit a driving force of the engine (2) is shifted from a forward second-speed range to a forward first-speed range and also in case of going up on a slope, calls and shifts to a higher output curve (N1) from the output curve storage device (36).
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5. An engine output controller (30) for a motor grader (40), comprising:
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an output curve storage device (36) storing a plurality of output curves (N1, N2 and N3) of an engine (2); and
an output curve changing device (35) selecting and shifting to one of the plurality of output curves (N1, N2 and N3), wherein;
the output curve changing device (35), in a grading mode, calls and shifts to a higher output curve (N1) from the output curve storage device (36); and
in a running mode, calls and shifts to a lower output curve (N3) from the output curve storage device (36). - View Dependent Claims (6)
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7. An engine output controller (30) for a hydraulic excavator (60), comprising:
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an output curve storage device (36) storing a plurality of output curves (N1, N2 and N3) of an engine (2); and
an output curve changing device (35) selecting and shifting to one of the plurality of output curves (N1, N2 and N3), wherein;
the output curve changing device (35), in a running mode and also in a steering operation, calls and shifts to a higher output curve (N1) from the output curve storage device (36).
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Specification