Engine control apparatus
First Claim
1. An engine control apparatus comprising:
- a hydraulic pump driven by an engine;
a hydraulic actuator to which pressure oil discharged from the hydraulic pump is supplied;
an operation unit configured to operate the hydraulic actuator;
a first target speed set unit configured to set a first target speed of the engine;
a second target speed calculation unit configured to calculate a second target speed limiting a maximum target speed of the engine according to increase of a load pressure of the hydraulic pump; and
a speed control unit configured to control an engine speed such that the engine speed is equal to the lower one of the first target speed and the second target speed.
1 Assignment
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Accused Products
Abstract
An engine control apparatus includes a hydraulic pump driven by an engine, a hydraulic actuator to which pressure oil discharged form the hydraulic pump is supplied, an operation lever configured to operate the hydraulic actuators, a detection means detecting operation amounts of operation lever means, an target flow rate calculation unit (50) calculating an target flow rate of the hydraulic pump based on the operation amount of the operation lever, a first target speed calculation unit (61) calculating a first target speed of the engine according to the target flow rate, a pump output limit value calculation unit (500) limiting the maximum target speed of the engine in an relief operation according to a load pressure of the hydraulic pump, a fourth engine target speed calculation unit (63).
13 Citations
8 Claims
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1. An engine control apparatus comprising:
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a hydraulic pump driven by an engine; a hydraulic actuator to which pressure oil discharged from the hydraulic pump is supplied; an operation unit configured to operate the hydraulic actuator; a first target speed set unit configured to set a first target speed of the engine; a second target speed calculation unit configured to calculate a second target speed limiting a maximum target speed of the engine according to increase of a load pressure of the hydraulic pump; and a speed control unit configured to control an engine speed such that the engine speed is equal to the lower one of the first target speed and the second target speed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification