Engine control device
First Claim
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1. An engine control device for controlling an engine to move a matching point according to a load applied to the engine on an engine torque diagram having an axis representing engine speed and an axis representing torque, wherein:
- a target torque line is set to pass through a fuel consumption minimum point, where a fuel consumption rate becomes minimum, or to pass through a vicinity of the fuel consumption minimum point and is set to be continuous from a low rotational speed to a high rotational speed on the engine torque diagram, and the engine is controlled to match at a point on the target torque line.
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Abstract
An engine control device capable of improving engine efficiency by operating the engine in an area where fuel consumption is small (good) while allowing high responsivity of the engine to be maintained. The object can be achieved by operating to match at a point on a target torque line of a torque diagram and operating an electric motor when a matching point moves on the target torque line in a direction in which a load applied to the engine output shaft becomes large.
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Citations
26 Claims
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1. An engine control device for controlling an engine to move a matching point according to a load applied to the engine on an engine torque diagram having an axis representing engine speed and an axis representing torque, wherein:
a target torque line is set to pass through a fuel consumption minimum point, where a fuel consumption rate becomes minimum, or to pass through a vicinity of the fuel consumption minimum point and is set to be continuous from a low rotational speed to a high rotational speed on the engine torque diagram, and the engine is controlled to match at a point on the target torque line. - View Dependent Claims (3, 4, 7, 16, 18, 19)
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2. An engine control device for controlling an engine to move a matching point according to a load applied to the engine on an engine torque diagram having an axis representing engine speed and an axis representing torque, wherein:
a target torque line is set to pass through a fuel consumption minimum point, where a fuel consumption rate becomes minimum on individual equal horsepower curves of the engine torque diagram, or to pass through a vicinity of the fuel consumption minimum point and is set to be continuous from a low rotational speed to a high rotational speed, and the engine is controlled to match at a point on the target torque line. - View Dependent Claims (14, 15, 17)
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5. An engine control device for controlling an engine by a governor to move a matching point according to a load applied to the engine on an engine torque diagram having an axis representing engine speed and an axis representing torque, wherein:
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a target torque line is set to pass through a fuel consumption minimum point, where a fuel consumption rate becomes minimum on the engine torque diagram or to pass through a vicinity of the fuel consumption minimum point and is set to be continuous from a low rotational speed to a high rotational speed; individual regulation lines are set to connect individual matching target rotational speeds and individual instructed rotational speeds on the target torque line; the governor injects fuel in an amount corresponding to a difference between an instructed rotational speed and a real rotational speed into the engine; and a command to change the instructed rotational speed by a portion corresponding to a difference between a matching target rotational speed and the real rotational speed is given to the governor. - View Dependent Claims (8, 20)
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6. An engine control device for controlling an engine by a governor to move a matching point according to a load applied to the engine on an engine torque diagram having an axis representing engine speed and an axis representing torque, wherein:
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a target torque line is set to pass through a fuel consumption minimum point, where a fuel consumption rate becomes minimum on individual equal horsepower curves of the engine torque diagram, or to pass through a vicinity of the fuel consumption minimum point; and
is set to be continuous from a low rotational speed to a high rotational speed;individual regulation lines are set to connect individual matching target rotational speeds and individual instructed rotational speeds on the target torque line; the governor injects fuel in an amount corresponding to a difference between an instructed rotational speed and a real rotational speed into the engine; and a command to change the instructed rotational speed by a portion corresponding to a difference between a matching target rotational speed and the real rotational speed is given to the governor. - View Dependent Claims (21, 22)
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9. An engine control device for controlling an engine to move a matching point, where engine power torque matches absorption torque of a hydraulic pump, on an engine torque diagram having an axis representing engine speed and an axis representing torque, wherein:
a target torque line is set in an area on the engine torque diagram where the engine has a low rotational speed and the hydraulic pump has a large displacement and is set to be continuous from a low rotational speed to a high rotational speed, and the engine is controlled to match at a point on the target torque line. - View Dependent Claims (12, 13)
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10. An engine control device for controlling an engine to move a matching point, where engine power torque matches absorption torque of a hydraulic pump, on an engine torque diagram having an axis representing engine speed and an axis representing torque, wherein:
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a second target torque line being continuous from a low rotational speed to a high rotational speed, where the engine has a low rotational speed and the hydraulic pump has a large displacement, is set with respect to a first target torque line which passes through a fuel consumption minimum point, where a fuel consumption rate becomes minimum on individual equal horsepower curves of the engine torque diagram, or passes through a vicinity of the fuel consumption minimum point and is continuous from a low rotational speed to a high rotational speed; and the engine is controlled to match at a point on the second target torque line. - View Dependent Claims (23, 25)
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11. An engine control device for controlling an engine to move a matching point, where engine power torque matches absorption torque of a hydraulic pump, on an engine torque diagram having an axis representing engine speed and an axis representing torque, wherein:
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a first target torque line is set to pass through a fuel consumption minimum point, where a fuel consumption rate becomes minimum on individual equal horsepower curves of the engine torque diagram, or pass through a vicinity of the fuel consumption minimum point and is set to be continuous from a low rotational speed to a high rotational speed; a second target torque line being continuous from a low rotational speed to a high rotational speed, where the engine has a low rotational speed and the hydraulic pump has a large displacement, is set with respect to the first target torque line; either the first target torque line or the second target torque line is selected; and the engine is controlled to match at a point on the selected target torque line. - View Dependent Claims (24, 26)
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Specification