US20130174539A1 - Engine Control System for Construction Machine - Google Patents
Engine Control System for Construction Machine Download PDFInfo
- Publication number
- US20130174539A1 US20130174539A1 US13/721,992 US201213721992A US2013174539A1 US 20130174539 A1 US20130174539 A1 US 20130174539A1 US 201213721992 A US201213721992 A US 201213721992A US 2013174539 A1 US2013174539 A1 US 2013174539A1
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- United States
- Prior art keywords
- engine
- temperature
- control system
- sensing device
- detecting
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Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B1/00—Equipment or apparatus for, or methods of, general hydraulic engineering, e.g. protection of constructions against ice-strains
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/04—Introducing corrections for particular operating conditions
- F02D41/042—Introducing corrections for particular operating conditions for stopping the engine
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2246—Control of prime movers, e.g. depending on the hydraulic load of work tools
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2278—Hydraulic circuits
- E02F9/2296—Systems with a variable displacement pump
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N11/00—Starting of engines by means of electric motors
- F02N11/08—Circuits or control means specially adapted for starting of engines
- F02N11/0814—Circuits or control means specially adapted for starting of engines comprising means for controlling automatic idle-start-stop
- F02N11/0818—Conditions for starting or stopping the engine or for deactivating the idle-start-stop mode
- F02N11/0833—Vehicle conditions
- F02N11/0837—Environmental conditions thereof, e.g. traffic, weather or road conditions
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/021—Engine temperature
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/023—Temperature of lubricating oil or working fluid
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/06—Fuel or fuel supply system parameters
- F02D2200/0606—Fuel temperature
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D31/00—Use of speed-sensing governors to control combustion engines, not otherwise provided for
- F02D31/001—Electric control of rotation speed
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N2200/00—Parameters used for control of starting apparatus
- F02N2200/02—Parameters used for control of starting apparatus said parameters being related to the engine
- F02N2200/023—Engine temperature
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Definitions
- This invention relates to an engine control system for a construction machine such as a hydraulic excavator, which after a predetermined time from the commencement of an idle operation state, can perform idle stop control that automatically stops an operation of an engine.
- an engine control system for a working machine is disclosed in JP-A-2003-65097.
- This conventional technology is equipped with a controller.
- This controller automatically stops an operation of an engine when a single-touch operation pushbutton switch, that is, an idle stop switch is operated during idling of the engine, and also performs idle stop control to automatically stop the operation of the engine when a state in which a control lever remains unmanipulated has continued longer than a predetermined time.
- the above-mentioned conventional technology brings the engine to an idle operation state in which the rpm of the engine is a predetermined low rpm, and after an elapse of a predetermined time, performs idle stop control to stop the operation of the engine even under such a work environment of low temperature.
- the present invention has as an object thereof the provision of an engine control system for a construction machine, which can save a power consumption relevant to a start-up of an engine under a work environment of low temperature and can also promptly resume work after the work is once stopped temporarily.
- the present invention is characterized in that in an engine control system for a construction machine provided with an engine, a hydraulic pump drivable by the engine, a hydraulic actuator drivable by pressure oil delivered from the hydraulic pump, a directional control valve for controlling a flow of pressure oil to be fed from the hydraulic pump to the hydraulic actuator, and a control device for switchingly controlling the directional control valve, and said engine control system being provided with a controller, which includes a manipulation state determination unit for determining a manipulation state of the control device and an idle stop control unit for performing idle stop control to stop an operation of the engine when the control device is determined to have remained unmanipulated for a predetermined time at the manipulation state determination unit, the engine control system is provided with a temperature sensing device for detecting a temperature of a fluid relevant to the operation of the engine, the controller comprises a temperature determination unit for determining whether or not the temperature of the fluid as detected by the temperature sensing device is not higher than a predetermined temperature set beforehand, and, when the temperature of the fluid is
- the controller performs processing to forcibly disable idle stop control when the construction machine has performed work under a work environment of low temperature that is considered to pose a problem on a start-up of the engine, the control device is determined to have remained unmanipulated for the predetermined time at the manipulation state determination unit of the controller and a temperature detected by the temperature sensing device is determined to be not higher than the predetermined temperature at the temperature determination unit of the controller, although under such conditions, idle stop control is about to be performed.
- the present invention obviates restarting the engine, and moreover, guides working oil, engine coolant and engine fuel into circuits, whereby the engine is kept warm to prevent cooling of the engine which would otherwise occur due to the environment of low temperature.
- the present invention does not require to restart the engine upon resumption of work subsequent to its discontinuation even under a work environment of low temperature that is considered to pose a problem on a start-up of the engine, and therefore, can save a power consumption associated with an operation of a starter switch and can also promptly resume work after it is once stopped temporarily.
- the present invention may also be characterized in that in the above-described invention, the controller is provided with an idle operation control unit for holding an rpm of the engine at an idle rpm, which is a predetermined low rpm, when the control device is determined by the manipulation state determination unit to have been brought from a manipulated state to an unmanipulated state, and the idle stop control unit performs processing to stop the operation of the engine when the control device is determined by the manipulation state determination unit to have been unmanipulated for a predetermined time from a start of idle operation control by the idle operation control unit.
- the controller is provided with an idle operation control unit for holding an rpm of the engine at an idle rpm, which is a predetermined low rpm, when the control device is determined by the manipulation state determination unit to have been brought from a manipulated state to an unmanipulated state
- the idle stop control unit performs processing to stop the operation of the engine when the control device is determined by the manipulation state determination unit to have been unmanipulated for a predetermined time from a start of idle operation control by the idle
- the engine moves to an idle operation by the idle operation control unit of the controller, and the idle operation is continued until the work is resumed next.
- the control device is manipulated again from the neutral position in such a situation, the actual rpm of the engine promptly increases according to a target rpm for the engine, thereby making it possible to perform work as desired.
- the present invention may also be characterized in that in the above-described invention, the fluid comprises working oil for driving the hydraulic actuator, and the temperature sensing device comprises a temperature sensor for detecting a temperature of the working oil.
- the present invention may also be characterized in that in the above-described invention, the fluid comprises engine coolant for cooling the engine, and the temperature sensing device comprises a temperature sensor for detecting a temperature of the engine coolant.
- the present invention may also be characterized in that in the above-described invention, the fluid comprises fuel for the engine, and the temperature sensing device comprises a temperature sensor for detecting a temperature of the fuel.
- the present invention may also be characterized in that in the above-described invention, the fluid comprises air in a work environment where the construction machine is placed, and the temperature sensing device comprises a temperature sensor for detecting a temperature of the air to be introduced into an intake pipe of the engine.
- the present invention is constructed such that the temperature sensing device is provided for detecting the temperature of the fluid relevant to the operation of the engine, the controller includes the temperature determination unit for determining whether or not the temperature of the fluid as detected by the temperature sensing device is not higher than the predetermined temperature set beforehand and considered to pose a problem on a start-up of the engine, and, when the temperature of the fluid is determined to be not higher than the predetermined temperature at the temperature determination unit, the controller performs processing to disable the idle stop control by the idle stop control unit.
- the present invention can save a power consumption relevant to a start-up of the engine under a work environment of low temperature, can assure excellent economy compared with before, can promptly resume work after the work is once stopped temporarily, can eliminate a sense of uncertainty conventionally tended to be given to the operator, and compared with before, can also improve the efficiency of work to be performed by the construction machine.
- FIG. 1 is a side view showing a hydraulic excavator mentioned as one example of a construction machine on which an embodiment of the engine control system according to the present invention is arranged.
- FIG. 2 is an electrical and hydraulic circuit diagram illustrating the embodiment of the engine control system according to the present invention.
- FIG. 3 is a flowchart depicting primary processing steps to be executed at a controller arranged in the embodiment.
- the construction machine on which the engine control system according to this embodiment is arranged is, for example, a hydraulic excavator shown in FIG. 1 .
- This hydraulic excavator is provided with a travel base 1 , a revolving upperstructure 2 mounted on the travel base 1 , and working equipment 3 attached pivotally in an up-and-down direction to the revolving upperstructure 2 .
- the working equipment 3 includes a boom 4 attached to the revolving upperstructure 2 , an arm 5 connected to a free end of the boom 4 , and a bucket 6 connected to a free end of the arm 5 .
- the working equipment 3 also includes a boom cylinder 4 a for actuating the boom 4 , an arm cylinder 5 a for actuating the arm 5 , and a bucket cylinder 6 a for actuating the bucket 6 .
- An operator' s cab 7 is arranged at a front-side position of the revolving upperstructure 2
- a counterweight 8 is arranged at a rear-side position of the revolving upperstructure 2
- an engine compartment 9 is arranged between the operator's cab 7 and the counterweight 8 .
- the engine control system which is arranged on the hydraulic excavator shown in FIG. 1 , is provided with an engine 11 arranged in the engine compartment 9 and a hydraulic pump 12 drivable by the engine 11 . Also provided are a working oil reservoir 13 for storing working oil to be fed to the hydraulic pump 12 , a hydraulic actuator 14 collectively representing the above-mentioned boom cylinder 4 a, arm cylinder 5 a and the like all of which are drivable by pressure oil delivered from the hydraulic pump 12 , and a directional control valve 15 for controlling a flow of pressure oil to be fed from the hydraulic pump 12 to the hydraulic actuator 14 .
- a control device 16 is arranged.
- the control device 16 has a control lever 16 a to switchingly operate the directional control valve 15 .
- This embodiment is also provided with a temperature sensing device for detecting a temperature of a fluid relevant to an operation of the engine 11 , for example, a temperature sensor 20 for detecting a temperature of the working oil, a pressure sensor 21 for detecting whether or not the control lever 16 a of the control device 16 has been manipulated, an instruction unit for outputting an instruction signal that indicates performance or non-performance of idle stop control to be mentioned subsequently herein, for example, an idle stop switch 22 , and an rpm instructing device 23 for instructing a target rpm for the engine 11 .
- This embodiment is further provided with a control unit to be inputted with signals outputted from the temperature sensor 20 , pressure sensor 21 , idle stop switch 22 and rpm instructing device 23 , specifically a controller 17 .
- the controller 17 includes a neutral determination unit 17 a, an idle operation control unit 17 b, a manipulation determination unit 17 c, and an idle stop control unit 17 d.
- the neutral determination unit 17 a determines, based on a signal outputted from the pressure sensor 21 , whether or not the control device 16 has been returned from a manipulated position to a neutral position.
- the idle operation control unit 17 b holds the rpm of the engine 11 at an idle rpm, which is a predetermined low rpm, when the control device 16 is determined to have been returned to the neutral position at the neutral determination unit 17 a.
- the manipulation determination unit 17 c determines whether or not the control device 16 has been manipulated.
- the idle stop control unit 17 d performs processing to stop the operation of the engine 11 when the control device 16 is determined to have remained unmanipulated during the predetermined time at the manipulation determination unit 17 c.
- the manipulation state determination unit which determines the manipulation state of the control device 16 , is made up by the above-mentioned neutral determination unit 17 a and manipulation determination unit 17 c.
- the controller 17 also includes an idle stop determination unit 17 e for determining, according to a signal outputted from the idle stop switch 22 , performance or non-performance of idle stop control by the idle stop control unit 17 d.
- the controller 17 further includes a temperature determination unit 17 f .
- the temperature determination unit 17 f determines whether or not the temperature of the working oil as detected by the temperature sensor 20 is not higher than the predetermined low temperature set beforehand and considered to pose a problem on a start-up of the engine 11 , for example, 0° C.
- the controller 17 performs processing to disable idle stop control by the idle stop control unit 17 d.
- the idle stop switch 22 Upon performing digging work or the like by the hydraulic excavator, the idle stop switch 22 is held OFF or is switched to ON. According to a signal outputted from the idle stop switch 22 , the idle stop determination unit 17 e of the controller 17 determines whether the performance or non-performance of idle stop control has been instructed (step S 1 ). When the idle stop switch 22 is OFF and the non-performance of idle stop control has been instructed, normal operation control is performed (step S 2 ).
- the idle operation control unit 17 b controls, based on the determination by the neutral determination unit 17 a, to bring the rpm of the engine 11 to an idle rpm, and in this idle operation state, the operation of the engine 11 is continued. At this time, the idle stop control unit 17 d is held to remain non-functioning.
- step S 1 finds that the idle stop switch 22 is set ON and the performance of idle stop control has been instructed
- the manipulation determination unit 17 c determines, based on signals outputted from the pressure sensor 21 , whether or not the control device 16 was manipulated during a predetermined time from the commencement of idle operation control by the idle operation control unit 17 b (step S 3 ).
- the routine moves to step S 2 , where normal operation control is performed. Described specifically, the engine 11 is operated such that the actual rpm of the engine 11 is brought to a target rpm for the engine 11 as instructed by the rpm instructing device 23 .
- the directional control valve 15 is switched according to manipulation of the control device 16 . Accordingly, pressure oil delivered from the hydraulic pump 12 is fed to the hydraulic actuator 14 via the directional control valve 15 .
- the hydraulic actuator 14 is hence actuated to drive, for example, the working equipment 3 shown in FIG. 1 so that digging work or the like of earth or sand is performed.
- the control lever 16 a of the control device 16 is returned to the neutral position from such a manipulated position, the rpm of the engine 11 drops to an idle operation state and this idle operation state is continued, as mentioned above.
- step S 4 it is determined at the temperature determination unit 17 f whether or not the temperature of the working oil as detected by the temperature sensor 20 is not higher than the predetermined low temperature, for example, 0° C. (step S 4 ) .
- the routine moves to step S 5 .
- step S 5 the idle stop control unit 17 d functions to perform processing that stops the operation of the engine 11 . In other words, idle stop control is performed. In this case, resumption of the work needs to restart the engine 11 .
- step S 4 the temperature of the working oil is determined to be not higher than the predetermined low temperature, for example, 0° C., it is indicated that the hydraulic excavator is placed under a work environment of low temperature to perform work.
- the routine then moves to step S 2 to perform normal operation control. Described specifically, when the control lever 16 a of the control device 16 is returned from the manipulated position to the neutral position, the rpm of the engine 11 is controlled to an idle rpm by the idle operation control unit 17 b, and under this idle operation control, the operation of the engine 11 is continued. In other words, although the idle stop switch 22 is set ON to perform idle stop control, the idle stop control is forcibly disabled.
- this embodiment can obviates restarting the engine 11 , and moreover, can guide the working oil, engine coolant and fuel for the engine 11 into circuits, whereby cooling of the engine 11 due to the environment of low temperature is reduced.
- this embodiment does not require to restart the engine 11 upon resuming work after its temporary stop even under a work environment of low temperature that is considered to pose a problem on a start-up of the engine 11 , and therefore, can save a power consumption associated with an operation of the starter switch and can assure excellent economy. Further, this embodiment can promptly resume work after it is once stopped temporarily, can eliminate a sense of uncertainty that is tended to be given to the operator, and can improve the efficiency of work to be performed by the hydraulic excavator.
- the temperature sensor 20 for detecting the temperature of the working oil is arranged as the temperature sensing device for detecting the temperature of the fluid relevant to the operation of the engine 11 .
- This invention shall, however, not be limited to such a construction.
- the present invention maybe constructed, for example, such that idle stop control is disabled irrespective of an ON operation of the idle stop switch 22 when a temperature sensor for detecting that the temperature of the engine coolant is not higher than the predetermined low temperature, for example, 0° C.
- the temperature of the engine coolant is determined at the temperature determination unit 17 f of the controller 17 as to whether or not it is not higher than the predetermined low temperature, and the temperature of the engine coolant is determined to be not higher than the predetermined low temperature.
- the present invention may also be constructed such that as the temperature sensing device, a temperature sensor for detecting that the temperature of the fuel for the engine 11 is not higher than the predetermined low temperature, for example, 0° C. is arranged, the temperature of the fuel is determined at the temperature determination unit 17 f of the controller 17 as to whether or not it is not higher than the predetermined low temperature, and idle stop control is disabled irrespective of an ON operation of the idle stop switch 22 when the temperature of the fuel is determined to be not higher than the predetermined temperature.
- a temperature sensor for detecting that the temperature of the fuel for the engine 11 is not higher than the predetermined low temperature for example, 0° C.
- the present invention may also be constructed such that as the temperature sensing device, a temperature sensor for detecting that the temperature of air to be guided to an intake pipe of the engine 11 , that is, the air in a work environment where the hydraulic excavator is placed is not higher than the predetermined low temperature, for example, 0° C. is arranged, the temperature of the air is determined at the temperature determination unit 17 f of the controller 17 as to whether or not it is not higher than the predetermined low temperature, and idle stop control is disabled irrespective of an ON operation of the idle stop switch 22 when the temperature of the air is determined to be not higher than the predetermined temperature.
- a temperature sensor for detecting that the temperature of air to be guided to an intake pipe of the engine 11 , that is, the air in a work environment where the hydraulic excavator is placed is not higher than the predetermined low temperature, for example, 0° C.
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mining & Mineral Resources (AREA)
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- Environmental & Geological Engineering (AREA)
- Toxicology (AREA)
- Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
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- Component Parts Of Construction Machinery (AREA)
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Abstract
Disclosed is an engine control system for a construction machine having an engine and a control device for controlling, via a directional control valve, a flow of pressure oil to be fed to a hydraulic actuator. The system is provided with a controller, which includes a manipulation state determination unit for the control device and an idle stop control unit for performing idle stop control when the control device is determined to have remained unmanipulated. The system also includes a temperature sensing device for a fluid relevant to the operation of the engine. The controller includes a unit for determining whether or not the temperature of the fluid is not higher than a predetermined temperature. When the temperature of the fluid is determined to be not higher than the predetermined temperature, the controller disables the idle stop control.
Description
- This application claims the priority of Japanese Patent Application 2012-003295 filed Jan. 11, 2012, which is incorporated herein by reference.
- 1. Field of the Invention
- This invention relates to an engine control system for a construction machine such as a hydraulic excavator, which after a predetermined time from the commencement of an idle operation state, can perform idle stop control that automatically stops an operation of an engine.
- 2. Description of the Related Art
- As a conventional technology of this kind, an engine control system for a working machine is disclosed in JP-A-2003-65097. This conventional technology is equipped with a controller. This controller automatically stops an operation of an engine when a single-touch operation pushbutton switch, that is, an idle stop switch is operated during idling of the engine, and also performs idle stop control to automatically stop the operation of the engine when a state in which a control lever remains unmanipulated has continued longer than a predetermined time.
- With the above-mentioned conventional technology, a problem however tends to arise when the working machine is placed under a work environment of low temperature to perform work. Under such a work environment of low temperature, the temperature of air is low, and as a consequence, the temperature of working oil for driving a hydraulic actuator, the temperature of engine coolant for cooling the engine and the temperature of fuel for the engine are lowered, so that the engine is prone to cooling. When the idle stop switch is operated and the control lever is returned from a manipulated position, where work is being performed, to a neutral position to temporarily stop the work, the above-mentioned conventional technology brings the engine to an idle operation state in which the rpm of the engine is a predetermined low rpm, and after an elapse of a predetermined time, performs idle stop control to stop the operation of the engine even under such a work environment of low temperature.
- Under a work environment of low temperature, however, an engine is hard to start when an attempt is made to start the engine for the resumption of work after a while from stopping an operation of the engine as mentioned above, because the engine has been cooled. Therefore, a longer cranking time is needed from an operation of a starter switch by an engine key until a start-up of the engine. Moreover, working oil of low temperature has a high viscosity, and therefore, needs a greater torque for driving a hydraulic pump so that a greater load is exerted on the engine. In addition, fuel of low temperature leads to solidification of wax components contained in the fuel, thereby inducing such wax components to deposit on a fuel filter, and hence, lowering the feed capability of fuel to the engine. Due to these causes, the engine becomes hard to start as mentioned above.
- With the conventional technology, a longer cranking time is needed as mentioned above when desired to resume the discontinued work under a work environment of low temperature after idle stop control was performed. Therefore, a greater power consumption is needed in connection with this start-up of the engine, and an economical problem arises. Furthermore, a longer cranking time is required until the work can be resumed, leading to problems that a sense of uncertainty is given to the operator and the work efficiency tends to decrease.
- With the above-mentioned actual situation of the conventional technology in view, the present invention has as an object thereof the provision of an engine control system for a construction machine, which can save a power consumption relevant to a start-up of an engine under a work environment of low temperature and can also promptly resume work after the work is once stopped temporarily.
- To achieve the above-described object, the present invention is characterized in that in an engine control system for a construction machine provided with an engine, a hydraulic pump drivable by the engine, a hydraulic actuator drivable by pressure oil delivered from the hydraulic pump, a directional control valve for controlling a flow of pressure oil to be fed from the hydraulic pump to the hydraulic actuator, and a control device for switchingly controlling the directional control valve, and said engine control system being provided with a controller, which includes a manipulation state determination unit for determining a manipulation state of the control device and an idle stop control unit for performing idle stop control to stop an operation of the engine when the control device is determined to have remained unmanipulated for a predetermined time at the manipulation state determination unit, the engine control system is provided with a temperature sensing device for detecting a temperature of a fluid relevant to the operation of the engine, the controller comprises a temperature determination unit for determining whether or not the temperature of the fluid as detected by the temperature sensing device is not higher than a predetermined temperature set beforehand, and, when the temperature of the fluid is determined to be not higher than the predetermined temperature at the temperature determination unit, the controller performs processing to disable the idle stop control by the idle stop control unit.
- According to the present invention constructed as described above, the controller performs processing to forcibly disable idle stop control when the construction machine has performed work under a work environment of low temperature that is considered to pose a problem on a start-up of the engine, the control device is determined to have remained unmanipulated for the predetermined time at the manipulation state determination unit of the controller and a temperature detected by the temperature sensing device is determined to be not higher than the predetermined temperature at the temperature determination unit of the controller, although under such conditions, idle stop control is about to be performed.
- Even when the control device is returned to a neutral position to once stop work temporarily from a manipulated position where the work is being performed, the operation of the engine, therefore, continues without stopping. As a consequence, the present invention obviates restarting the engine, and moreover, guides working oil, engine coolant and engine fuel into circuits, whereby the engine is kept warm to prevent cooling of the engine which would otherwise occur due to the environment of low temperature. In other words, the present invention does not require to restart the engine upon resumption of work subsequent to its discontinuation even under a work environment of low temperature that is considered to pose a problem on a start-up of the engine, and therefore, can save a power consumption associated with an operation of a starter switch and can also promptly resume work after it is once stopped temporarily.
- The present invention may also be characterized in that in the above-described invention, the controller is provided with an idle operation control unit for holding an rpm of the engine at an idle rpm, which is a predetermined low rpm, when the control device is determined by the manipulation state determination unit to have been brought from a manipulated state to an unmanipulated state, and the idle stop control unit performs processing to stop the operation of the engine when the control device is determined by the manipulation state determination unit to have been unmanipulated for a predetermined time from a start of idle operation control by the idle operation control unit.
- According to the present invention constructed as described immediately above, when the control device is returned to the neutral position to once stop work temporarily from a manipulated position where the work is being performed, the engine moves to an idle operation by the idle operation control unit of the controller, and the idle operation is continued until the work is resumed next. When the control device is manipulated again from the neutral position in such a situation, the actual rpm of the engine promptly increases according to a target rpm for the engine, thereby making it possible to perform work as desired.
- The present invention may also be characterized in that in the above-described invention, the fluid comprises working oil for driving the hydraulic actuator, and the temperature sensing device comprises a temperature sensor for detecting a temperature of the working oil.
- The present invention may also be characterized in that in the above-described invention, the fluid comprises engine coolant for cooling the engine, and the temperature sensing device comprises a temperature sensor for detecting a temperature of the engine coolant.
- The present invention may also be characterized in that in the above-described invention, the fluid comprises fuel for the engine, and the temperature sensing device comprises a temperature sensor for detecting a temperature of the fuel.
- The present invention may also be characterized in that in the above-described invention, the fluid comprises air in a work environment where the construction machine is placed, and the temperature sensing device comprises a temperature sensor for detecting a temperature of the air to be introduced into an intake pipe of the engine.
- The present invention is constructed such that the temperature sensing device is provided for detecting the temperature of the fluid relevant to the operation of the engine, the controller includes the temperature determination unit for determining whether or not the temperature of the fluid as detected by the temperature sensing device is not higher than the predetermined temperature set beforehand and considered to pose a problem on a start-up of the engine, and, when the temperature of the fluid is determined to be not higher than the predetermined temperature at the temperature determination unit, the controller performs processing to disable the idle stop control by the idle stop control unit. Owing to this construction, the present invention can save a power consumption relevant to a start-up of the engine under a work environment of low temperature, can assure excellent economy compared with before, can promptly resume work after the work is once stopped temporarily, can eliminate a sense of uncertainty conventionally tended to be given to the operator, and compared with before, can also improve the efficiency of work to be performed by the construction machine.
-
FIG. 1 is a side view showing a hydraulic excavator mentioned as one example of a construction machine on which an embodiment of the engine control system according to the present invention is arranged. -
FIG. 2 is an electrical and hydraulic circuit diagram illustrating the embodiment of the engine control system according to the present invention. -
FIG. 3 is a flowchart depicting primary processing steps to be executed at a controller arranged in the embodiment. - The embodiment of the engine control system according to the present invention for the construction machine will hereinafter be described with reference to the accompanying drawings.
- The construction machine on which the engine control system according to this embodiment is arranged is, for example, a hydraulic excavator shown in
FIG. 1 . This hydraulic excavator is provided with atravel base 1, a revolvingupperstructure 2 mounted on thetravel base 1, andworking equipment 3 attached pivotally in an up-and-down direction to the revolvingupperstructure 2. Theworking equipment 3 includes aboom 4 attached to the revolvingupperstructure 2, anarm 5 connected to a free end of theboom 4, and a bucket 6 connected to a free end of thearm 5. Theworking equipment 3 also includes aboom cylinder 4 a for actuating theboom 4, anarm cylinder 5 a for actuating thearm 5, and abucket cylinder 6 a for actuating the bucket 6. An operator' scab 7 is arranged at a front-side position of the revolvingupperstructure 2, a counterweight 8 is arranged at a rear-side position of the revolvingupperstructure 2, and anengine compartment 9 is arranged between the operator'scab 7 and the counterweight 8. - The engine control system according to this embodiment, which is arranged on the hydraulic excavator shown in
FIG. 1 , is provided with anengine 11 arranged in theengine compartment 9 and ahydraulic pump 12 drivable by theengine 11. Also provided are a workingoil reservoir 13 for storing working oil to be fed to thehydraulic pump 12, ahydraulic actuator 14 collectively representing the above-mentionedboom cylinder 4 a,arm cylinder 5 a and the like all of which are drivable by pressure oil delivered from thehydraulic pump 12, and adirectional control valve 15 for controlling a flow of pressure oil to be fed from thehydraulic pump 12 to thehydraulic actuator 14. - In the operator's
cab 7, acontrol device 16 is arranged. Thecontrol device 16 has acontrol lever 16 a to switchingly operate thedirectional control valve 15. This embodiment is also provided with a temperature sensing device for detecting a temperature of a fluid relevant to an operation of theengine 11, for example, atemperature sensor 20 for detecting a temperature of the working oil, apressure sensor 21 for detecting whether or not the control lever 16 a of thecontrol device 16 has been manipulated, an instruction unit for outputting an instruction signal that indicates performance or non-performance of idle stop control to be mentioned subsequently herein, for example, anidle stop switch 22, and an rpm instructingdevice 23 for instructing a target rpm for theengine 11. - This embodiment is further provided with a control unit to be inputted with signals outputted from the
temperature sensor 20,pressure sensor 21,idle stop switch 22 and rpm instructingdevice 23, specifically acontroller 17. - As illustrated in
FIG. 2 , thecontroller 17 includes aneutral determination unit 17 a, an idleoperation control unit 17 b, amanipulation determination unit 17 c, and an idlestop control unit 17 d. Theneutral determination unit 17 a determines, based on a signal outputted from thepressure sensor 21, whether or not thecontrol device 16 has been returned from a manipulated position to a neutral position. The idleoperation control unit 17 b holds the rpm of theengine 11 at an idle rpm, which is a predetermined low rpm, when thecontrol device 16 is determined to have been returned to the neutral position at theneutral determination unit 17 a. Based on signals outputted from thepressure sensor 21 during a predetermined time from a commencement of idle operation control by the idleoperation control unit 17 b, themanipulation determination unit 17 c determines whether or not thecontrol device 16 has been manipulated. The idlestop control unit 17 d performs processing to stop the operation of theengine 11 when thecontrol device 16 is determined to have remained unmanipulated during the predetermined time at themanipulation determination unit 17 c. It is to be noted that the manipulation state determination unit, which determines the manipulation state of thecontrol device 16, is made up by the above-mentionedneutral determination unit 17 a andmanipulation determination unit 17 c. - The
controller 17 also includes an idlestop determination unit 17 e for determining, according to a signal outputted from theidle stop switch 22, performance or non-performance of idle stop control by the idlestop control unit 17 d. - The
controller 17 further includes atemperature determination unit 17 f . When the performance of idle stop control by the idlestop control unit 17 d has been determined at the idlestop determination unit 17 e and thecontrol device 16 is determined to have been returned to the neutral position at theneutral determination unit 17 a, thetemperature determination unit 17 f determines whether or not the temperature of the working oil as detected by thetemperature sensor 20 is not higher than the predetermined low temperature set beforehand and considered to pose a problem on a start-up of theengine 11, for example, 0° C. When the temperature of the working oil is determined to be not higher than the predetermined low temperature at thetemperature determination unit 17 f, thecontroller 17 performs processing to disable idle stop control by the idlestop control unit 17 d. - With reference to
FIG. 3 , a description will be made of primary processing steps to be executed at thecontroller 17 in this embodiment, which is constructed as described above. - Upon performing digging work or the like by the hydraulic excavator, the
idle stop switch 22 is held OFF or is switched to ON. According to a signal outputted from theidle stop switch 22, the idlestop determination unit 17 e of thecontroller 17 determines whether the performance or non-performance of idle stop control has been instructed (step S1). When theidle stop switch 22 is OFF and the non-performance of idle stop control has been instructed, normal operation control is performed (step S2). Described specifically, when thecontrol lever 16 a of thecontrol device 16 is returned from a manipulated position to the neutral position, the idleoperation control unit 17 b controls, based on the determination by theneutral determination unit 17 a, to bring the rpm of theengine 11 to an idle rpm, and in this idle operation state, the operation of theengine 11 is continued. At this time, the idlestop control unit 17 d is held to remain non-functioning. - When the above-mentioned determination in step S1 finds that the
idle stop switch 22 is set ON and the performance of idle stop control has been instructed, themanipulation determination unit 17 c determines, based on signals outputted from thepressure sensor 21, whether or not thecontrol device 16 was manipulated during a predetermined time from the commencement of idle operation control by the idleoperation control unit 17 b (step S3). When thecontrol device 16 is determined to have been manipulated, the routine moves to step S2, where normal operation control is performed. Described specifically, theengine 11 is operated such that the actual rpm of theengine 11 is brought to a target rpm for theengine 11 as instructed by therpm instructing device 23. At this time, thedirectional control valve 15 is switched according to manipulation of thecontrol device 16. Accordingly, pressure oil delivered from thehydraulic pump 12 is fed to thehydraulic actuator 14 via thedirectional control valve 15. Thehydraulic actuator 14 is hence actuated to drive, for example, the workingequipment 3 shown inFIG. 1 so that digging work or the like of earth or sand is performed. When thecontrol lever 16 a of thecontrol device 16 is returned to the neutral position from such a manipulated position, the rpm of theengine 11 drops to an idle operation state and this idle operation state is continued, as mentioned above. - When by the above-mentioned determination in step S3, the
control device 16 is determined to have remained unmanipulated, it is determined at thetemperature determination unit 17 f whether or not the temperature of the working oil as detected by thetemperature sensor 20 is not higher than the predetermined low temperature, for example, 0° C. (step S4) . When, the temperature of the working oil is determined to be higher than the predetermined low temperature, that is, 0° C., the routine moves to step S5. In step S5, the idlestop control unit 17 d functions to perform processing that stops the operation of theengine 11. In other words, idle stop control is performed. In this case, resumption of the work needs to restart theengine 11. As this restart of theengine 11 is performed in a work environment that the temperature of the working oil is held relatively high, the cranking time from an operation of the starter switch until a start-up of theengine 11 can be shortened so that no problem is imposed on the start-up of theengine 11. - When by the above-mentioned determination in step S4, the temperature of the working oil is determined to be not higher than the predetermined low temperature, for example, 0° C., it is indicated that the hydraulic excavator is placed under a work environment of low temperature to perform work. The routine then moves to step S2 to perform normal operation control. Described specifically, when the
control lever 16 a of thecontrol device 16 is returned from the manipulated position to the neutral position, the rpm of theengine 11 is controlled to an idle rpm by the idleoperation control unit 17 b, and under this idle operation control, the operation of theengine 11 is continued. In other words, although theidle stop switch 22 is set ON to perform idle stop control, the idle stop control is forcibly disabled. - According to the embodiment constructed as described above, when the hydraulic excavator is under a work environment of low temperature and the
control lever 16 a is returned from a manipulated position, where work is being performed, to the neutral position to once stop the work temporarily, theengine 11 moves to an idle operation by the idleoperation control unit 17 b of thecontroller 17, and this idle operation is continued until the work is resumed next time. As a consequence, this embodiment can obviates restarting theengine 11, and moreover, can guide the working oil, engine coolant and fuel for theengine 11 into circuits, whereby cooling of theengine 11 due to the environment of low temperature is reduced. When thecontrol lever 16 a is manipulated again from the neutral position, the actual rpm of theengine 11, therefore, promptly increases according to a target rpm for theengine 11 so that desired work can be performed. Therefore, this embodiment does not require to restart theengine 11 upon resuming work after its temporary stop even under a work environment of low temperature that is considered to pose a problem on a start-up of theengine 11, and therefore, can save a power consumption associated with an operation of the starter switch and can assure excellent economy. Further, this embodiment can promptly resume work after it is once stopped temporarily, can eliminate a sense of uncertainty that is tended to be given to the operator, and can improve the efficiency of work to be performed by the hydraulic excavator. - In the above-described embodiment, the
temperature sensor 20 for detecting the temperature of the working oil is arranged as the temperature sensing device for detecting the temperature of the fluid relevant to the operation of theengine 11. This invention shall, however, not be limited to such a construction. The present invention maybe constructed, for example, such that idle stop control is disabled irrespective of an ON operation of theidle stop switch 22 when a temperature sensor for detecting that the temperature of the engine coolant is not higher than the predetermined low temperature, for example, 0° C. is arranged as the temperature sensing device, the temperature of the engine coolant is determined at thetemperature determination unit 17 f of thecontroller 17 as to whether or not it is not higher than the predetermined low temperature, and the temperature of the engine coolant is determined to be not higher than the predetermined low temperature. - The present invention may also be constructed such that as the temperature sensing device, a temperature sensor for detecting that the temperature of the fuel for the
engine 11 is not higher than the predetermined low temperature, for example, 0° C. is arranged, the temperature of the fuel is determined at thetemperature determination unit 17 f of thecontroller 17 as to whether or not it is not higher than the predetermined low temperature, and idle stop control is disabled irrespective of an ON operation of theidle stop switch 22 when the temperature of the fuel is determined to be not higher than the predetermined temperature. - The present invention may also be constructed such that as the temperature sensing device, a temperature sensor for detecting that the temperature of air to be guided to an intake pipe of the
engine 11, that is, the air in a work environment where the hydraulic excavator is placed is not higher than the predetermined low temperature, for example, 0° C. is arranged, the temperature of the air is determined at thetemperature determination unit 17 f of thecontroller 17 as to whether or not it is not higher than the predetermined low temperature, and idle stop control is disabled irrespective of an ON operation of theidle stop switch 22 when the temperature of the air is determined to be not higher than the predetermined temperature.
Claims (10)
1. An engine control system for a construction machine provided with an engine, a hydraulic pump drivable by the engine, a hydraulic actuator drivable by pressure oil delivered from the hydraulic pump, a directional control valve for controlling a flow of pressure oil to be fed from the hydraulic pump to the hydraulic actuator, and a control device for switchingly controlling the directional control valve, and
said engine control system being provided with a controller, which includes a manipulation state determination unit for determining a manipulation state of the control device and an idle stop control unit for performing idle stop control to stop an operation of the engine when the control device is determined to have remained unmanipulated for a predetermined time at the manipulation state determination unit,
wherein the engine control system is provided with a temperature sensing device for detecting a temperature of a fluid relevant to the operation of the engine, the controller comprises a temperature determination unit for determining whether or not the temperature of the fluid as detected by the temperature sensing device is not higher than a predetermined temperature set beforehand, and, when the temperature of the fluid is determined to be not higher than the predetermined temperature at the temperature determination unit, the controller performs processing to disable the idle stop control by the idle stop control unit.
2. The engine control system according to claim 1 , wherein:
the controller is provided with an idle operation control unit for holding an rpm of the engine at an idle rpm, which is a predetermined low rpm, when the control device is determined by the manipulation state determination unit to have been brought from a manipulated state to an unmanipulated state, and
the idle stop control unit performs processing to stop the operation of the engine when the control device is determined by the manipulation state determination unit to have been unmanipulated for a predetermined time from a start of idle operation control by the idle operation control unit.
3. The engine control system according to claim 1 , wherein:
the fluid comprises working oil for driving the hydraulic actuator, and the temperature sensing device comprises a temperature sensor for detecting a temperature of the working oil.
4. The engine control system according to claim 1 , wherein:
the fluid comprises engine coolant for cooling the engine, and the temperature sensing device comprises a temperature sensor for detecting a temperature of the engine coolant.
5. The engine control system according to claim 1 , wherein:
the fluid comprises fuel for the engine, and the temperature sensing device comprises a temperature sensor for detecting a temperature of the fuel.
6. The engine control system according to claim 1 , wherein:
the fluid comprises air in a work environment where the construction machine is placed, and the temperature sensing device comprises a temperature sensor for detecting a temperature of the air to be introduced into an intake pipe of the engine.
7. The engine control system according to claim 2 , wherein:
the fluid comprises working oil for driving the hydraulic actuator, and the temperature sensing device comprises a temperature sensor for detecting a temperature of the working oil.
8. The engine control system according to claim 2 , wherein:
the fluid comprises engine coolant for cooling the engine, and the temperature sensing device comprises a temperature sensor for detecting a temperature of the engine coolant.
9. The engine control system according to claim 2 , wherein:
the fluid comprises fuel for the engine, and the temperature sensing device comprises a temperature sensor for detecting a temperature of the fuel.
10. The engine control system according to claim 2 , wherein:
the fluid comprises air in a work environment where the construction machine is placed, and the temperature sensing device comprises a temperature sensor for detecting a temperature of the air to be introduced into an intake pipe of the engine.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2012-003295 | 2012-01-11 | ||
JP2012003295A JP2013142341A (en) | 2012-01-11 | 2012-01-11 | Engine control device of construction machine |
Publications (1)
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US20130174539A1 true US20130174539A1 (en) | 2013-07-11 |
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ID=47602948
Family Applications (1)
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US13/721,992 Abandoned US20130174539A1 (en) | 2012-01-11 | 2012-12-20 | Engine Control System for Construction Machine |
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US (1) | US20130174539A1 (en) |
EP (1) | EP2615213A2 (en) |
JP (1) | JP2013142341A (en) |
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US20150032314A1 (en) * | 2013-07-23 | 2015-01-29 | Komatsu Ltd. | Hybrid Work Machine and Method of Controlling Auto-Stop of Engine for the Same |
US20150039187A1 (en) * | 2013-08-05 | 2015-02-05 | Deere & Company | System and method for controlling a drive unit of a work machine during an idle state |
US20190301418A1 (en) * | 2018-04-02 | 2019-10-03 | Ford Global Technologies, Llc | System and methods for operating an engine |
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EP3133275A4 (en) * | 2014-04-15 | 2018-04-25 | Volvo Construction Equipment AB | Engine control system using isg |
CN105221276B (en) * | 2014-10-15 | 2019-03-19 | 徐州重型机械有限公司 | A kind of control method of engine speed, system and crane |
JP6371727B2 (en) * | 2015-03-17 | 2018-08-08 | ヤンマー株式会社 | engine |
CN106593670B (en) * | 2016-12-30 | 2019-09-20 | 上海汽车集团股份有限公司 | Start control method under diesel engine cold environment |
KR102413063B1 (en) * | 2020-06-25 | 2022-06-24 | 두산산업차량 주식회사 | Construction machine ISG control system and method of construction machine ISG control |
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JP4543588B2 (en) * | 2000-07-14 | 2010-09-15 | トヨタ自動車株式会社 | Engine fuel injection control device |
JP3825289B2 (en) | 2001-08-27 | 2006-09-27 | 新キャタピラー三菱株式会社 | Engine control device for work machines |
JP2004239082A (en) * | 2003-02-03 | 2004-08-26 | Kobelco Contstruction Machinery Ltd | Engine control system of construction machine |
JP4522146B2 (en) * | 2004-05-25 | 2010-08-11 | 日立建機株式会社 | Construction machinery warm-up operation mechanism |
JP2006063929A (en) * | 2004-08-30 | 2006-03-09 | Tadano Ltd | Vehicle equipped with working machine |
JP2006299825A (en) * | 2005-04-15 | 2006-11-02 | Hitachi Constr Mach Co Ltd | Warming-up operation system of construction machine |
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JP2008057468A (en) * | 2006-08-31 | 2008-03-13 | Shin Caterpillar Mitsubishi Ltd | Engine control device of work machine |
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- 2012-01-11 JP JP2012003295A patent/JP2013142341A/en active Pending
- 2012-12-17 EP EP12197464.6A patent/EP2615213A2/en not_active Withdrawn
- 2012-12-20 US US13/721,992 patent/US20130174539A1/en not_active Abandoned
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Also Published As
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EP2615213A2 (en) | 2013-07-17 |
JP2013142341A (en) | 2013-07-22 |
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Owner name: HITACHI CONSTRUCTION MACHINERY CO., LTD., JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:EZAWA, MASANORI;ARAI, YASUSHI;KAMIYA, SHOUHEI;REEL/FRAME:029511/0729 Effective date: 20121121 |
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