CN109630298B - Control method and control system of power system and engineering machinery - Google Patents
Control method and control system of power system and engineering machinery Download PDFInfo
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- CN109630298B CN109630298B CN201811519848.XA CN201811519848A CN109630298B CN 109630298 B CN109630298 B CN 109630298B CN 201811519848 A CN201811519848 A CN 201811519848A CN 109630298 B CN109630298 B CN 109630298B
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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
- F02D41/30—Controlling fuel injection
- F02D41/3005—Details not otherwise provided for
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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
- F02D31/00—Use of speed-sensing governors to control combustion engines, not otherwise provided for
- F02D31/001—Electric control of rotation speed
- F02D31/007—Electric control of rotation speed controlling fuel supply
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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
- F02D2200/06—Fuel or fuel supply system parameters
- F02D2200/0602—Fuel pressure
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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
- F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
- F02D2200/1002—Output torque
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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
- F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
- F02D2200/101—Engine speed
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The invention provides a control method of a power system, the control system of the power system and engineering machinery, wherein the power system comprises an oil pump and an engine, and the control method of the power system comprises the steps of obtaining a first flow of the oil pump; controlling the engine to operate at a first rotational speed matching the first flow rate; acquiring the load fuel injection quantity of an engine and the maximum fuel injection quantity of the engine at a first rotating speed; comparing the load fuel injection quantity with the maximum fuel injection quantity; and adjusting the rotation speed of the engine according to the comparison result. According to the invention, the load fuel injection quantity and the maximum fuel injection quantity of the engine are compared, the rotating speed of the engine is adjusted according to the comparison result, the flow demand of a user on the fuel pump is comprehensively considered, and the lowest rotating speed and the highest rotating speed of the engine are limited, so that the engine works in an economic and fuel-saving and low-noise area, and the energy consumption of the whole engine is effectively reduced.
Description
Technical Field
The invention relates to the technical field of engineering machinery, in particular to a control method of a power system, a control system of the power system and the engineering machinery.
Background
At present, the engine energy-saving control of a concrete pump mainly adopts two control modes: one is to set the engine to run at a fixed rotational speed at a fixed displacement of the oil pump; another is to derive engine output power to regulate the engine to operate at a suitable speed. However, the first control method cannot realize the adjustment of the engine speed according to the load change, and if the engine continues to operate at a high speed, the fuel consumption is high, and if the fixed speed of the engine is set to be low, the engine is easy to stall under the condition of high load; when the load of the engineering machinery changes frequently, the rotating speed of the engine is adjusted continuously in the second control mode, and the rotating speed is suddenly high and suddenly low, so that the safety use performance of the engine is influenced.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art or the related art.
To this end, a first aspect of the present invention is to provide a control method of a power system.
In a second aspect of the present invention, a control system for a powertrain is provided.
A third aspect of the present invention is to provide a construction machine.
In view of this, according to a first aspect of the present invention, there is provided a control method of a power system including an oil pump and an engine, characterized by comprising: acquiring a first flow of an oil pump; controlling the engine to operate at a first rotational speed matching the first flow rate; acquiring the load fuel injection quantity of an engine and the maximum fuel injection quantity of the engine at a first rotating speed; comparing the load fuel injection quantity with the maximum fuel injection quantity; and adjusting the rotation speed of the engine according to the comparison result.
The invention provides a control method of a power system, wherein the power system comprises an oil pump and an engine, the control method of the power system comprises the steps of obtaining a first flow of the oil pump, controlling the engine to run at a first rotating speed matched with the first flow, obtaining a load oil injection quantity of the engine and a maximum oil injection quantity of the engine at the first rotating speed, further comparing the load oil injection quantity of the engine with the maximum oil injection quantity of the engine, and then adjusting the rotating speed of the engine according to a comparison result. The first flow rate of the oil pump is set by a user, that is, the user can set the flow rate of the oil pump through a flow rate input signal device (a button switch). The engine can be subjected to linear proportional stepless regulation according to the first flow of the oil pump, so that the rotating speed of the engine reaches a first rotating speed matched with the first flow, wherein the rotating speed of the engine can be increased along with the increase of the flow of the oil pump and can be reduced along with the reduction of the flow of the oil pump. According to the invention, the load fuel injection quantity and the maximum fuel injection quantity of the engine are compared, the rotating speed of the engine is adjusted according to the comparison result, the flow demand of a user on the fuel pump is comprehensively considered, and the lowest rotating speed and the highest rotating speed of the engine are limited, so that the engine works in an economic and fuel-saving and low-noise area, and the energy consumption of the whole engine is effectively reduced. The engine is a Controller Area Network (CAN) bus electric control engine, the power system CAN acquire the fuel injection quantity of the engine and the maximum fuel injection quantity allowed by an external characteristic curve under the current rotating speed in real time, and CAN automatically adjust to the optimal rotating speed according to load change and considering the energy consumption and noise of the engine, so that the adaptability of the engine to the working condition change is enhanced.
In addition, according to the control method of the power system in the above technical solution provided by the present invention, the following additional technical features may be further provided:
in the above technical solution, preferably, the step of adjusting the rotation speed of the engine according to the comparison result includes: when the load fuel injection quantity is smaller than the maximum fuel injection quantity, the engine runs at a first rotating speed; and when the load fuel injection quantity is greater than or equal to the maximum fuel injection quantity, regulating the rotating speed of the engine.
In the technical scheme, when the load oil injection quantity of the engine is smaller than the maximum oil injection quantity, the rotating speed of the engine at the moment is indicated to meet the power requirement of the load, and the rotating speed of the engine is unchanged and still runs at the first rotating speed. When the load oil injection quantity of the engine is larger than or equal to the maximum oil injection quantity, the rotating speed of the engine cannot meet the power requirement of the load at the moment, and the rotating speed of the engine needs to be adjusted at the moment so as to meet the power requirement of the load and ensure the normal work of equipment with the power system.
In any of the above technical solutions, preferably, after the step when the load fuel injection amount is greater than or equal to the maximum fuel injection amount, the step of adjusting the rotation speed of the engine includes: detecting the duration that the load fuel injection quantity is greater than or equal to the maximum fuel injection quantity; judging whether the duration is longer than a preset duration or not; when the duration is greater than or equal to the preset duration, adjusting the rotating speed of the engine; when the duration is less than the preset duration, the engine is operated at a first speed.
In the technical scheme, after the step of adjusting the rotation speed of the engine when the load fuel injection quantity is greater than or equal to the maximum fuel injection quantity, the control method of the power system further comprises the steps of detecting the duration of the load fuel injection quantity which is greater than or equal to the maximum fuel injection quantity, judging whether the duration is greater than a preset duration, and when the duration is greater than or equal to the preset duration, judging that the power output of the power system does not meet the requirement of equipment, so that the rotation speed of the engine must be adjusted to obtain a larger power output, and further the power requirement of the equipment is met. And when the duration is less than the preset duration, the power demand of the equipment can be judged to be unstable, so that the rotating speed of the engine can be kept unchanged, and the duration that the load fuel injection quantity is greater than or equal to the maximum fuel injection quantity is continuously detected to judge whether the rotating speed of the engine needs to be adjusted so as to adjust the power output of the power system.
In any of the above technical solutions, preferably, the control method of the power system further includes: detecting a system pressure of an oil pump; comparing the system pressure with a constant power regulation pressure point of the oil pump; and adjusting the flow of the oil pump according to the comparison result.
In this technical solution, the control method of the power system further includes: and when the load of the power system continues to increase, detecting the system pressure of the oil pump, comparing the detected system pressure with the constant power regulation pressure point of the oil pump, and regulating the flow of the oil pump according to the comparison result. The oil pump is an electronic constant power oil pump, and when the system pressure of the oil pump reaches a constant power regulation pressure point, the oil pump outputs constant power under set constant torque. The pressure point is adjusted by comparing the system pressure with the constant power of the oil pump, and then the flow of the oil pump is adjusted, so that the oil pump works under the constant power, the normal operation of an engine is ensured, and the normal operation of equipment is ensured.
In any of the above technical solutions, preferably, the step of adjusting the flow rate of the oil pump according to the comparison result includes: when the system pressure is less than or equal to the constant power regulation pressure point, controlling the oil pump to operate at a first flow rate; when the system pressure is greater than the constant power regulated pressure point, the oil pump is controlled to operate at a second flow rate different from the first flow rate.
In the technical scheme, the specific steps of adjusting the flow of the oil pump according to the comparison result comprise: when the system pressure is smaller than or equal to the constant power regulation pressure point, the oil pump is controlled to operate at the first flow rate, namely, the flow rate of the oil pump is still the first flow rate input by a user, and the flow rate of the oil pump is unchanged. When the system pressure is greater than the constant power regulation pressure point, the flow of the oil pump needs to be limited at the moment, namely the oil pump is controlled to operate at a second flow different from the first flow at the moment, so that the oil pump outputs constant power under constant torque, and normal operation of equipment is ensured.
In any of the above technical solutions, preferably, the step of controlling the oil pump to operate at a second flow rate different from the first flow rate includes: acquiring a second flow rate according to the system pressure and the set torque of the oil pump, wherein the second flow rate is smaller than the first flow rate; the oil pump is controlled to operate at a second flow rate.
In this embodiment, the step of controlling the oil pump to operate at a second flow rate different from the first flow rate specifically includes obtaining the second flow rate according to the system pressure and the set torque of the oil pump, where the second flow rate is smaller than the first flow rate, and where the system pressure and the set torque of the oil pump satisfy the formula: the flow rate of the oil pump is (the set torque of the oil pump is 2 pi)/the system pressure, that is, when the system pressure is increased, the flow rate of the oil pump is limited, so that the oil pump can output constant power under constant torque, and the normal operation of the equipment is ensured.
In any of the above solutions, preferably, the step of controlling the engine to operate at the first rotation speed matched to the first flow rate includes: calculating the matching relation between the flow of the oil pump and the rotating speed of the engine according to the universal characteristic curve of the engine and the external characteristic curve of the engine; calculating a first rotating speed according to the first flow and the matching relation; the engine is controlled to operate at a first speed.
In the technical scheme, the step of controlling the engine to run at the first rotating speed matched with the first flow rate specifically comprises the following steps of: and calculating the matching relation between the flow of the oil pump and the rotating speed of the engine according to the universal characteristic curve of the engine and the external characteristic curve of the engine, wherein the universal characteristic curve of the engine mainly reflects the oil consumption rate under different engine rotating speeds and load conditions. The external characteristic of the engine is an engine speed characteristic measured under the condition that the engine can generate the maximum power under the best working condition of the engine. The matching relation between the flow of the oil pump and the rotating speed of the engine can be obtained through the unique universal characteristic curve and the external characteristic curve of the engine, the first rotating speed of the engine is calculated according to the first flow of the oil pump and the matching relation, and the engine is controlled to run at the first rotating speed.
In any of the above technical solutions, preferably, the step of adjusting the rotation speed of the engine includes: calculating a second rotating speed according to the universal characteristic curve of the engine and the load fuel injection quantity of the engine, wherein the second rotating speed is greater than the first rotating speed; and controlling the engine to run at the second rotating speed.
In this technical solution, the step of controlling the engine to operate at a second rotational speed different from the first rotational speed specifically includes: and calculating a second rotating speed according to the universal characteristic curve of the engine and the load fuel injection quantity of the engine, wherein the second rotating speed is greater than the first rotating speed, and controlling the engine to operate at the second rotating speed so as to meet the power requirement of equipment. When the load oil injection amount is larger than or equal to the maximum oil injection amount, namely the output power of the power system does not meet the power requirement of the equipment at the moment, the engine is controlled to operate at a second rotating speed different from the first rotating speed, and the power output of the engine is further improved.
In any of the above technical solutions, preferably, the maximum fuel injection amount is a maximum fuel injection amount allowed by an external characteristic curve when the engine operates at the first rotation speed; the set torque of the oil pump is the maximum torque of the oil pump.
In any of the above technical solutions, preferably, the control method of the power system further includes: and displaying the flow of the oil pump, the system pressure of the oil pump, the rotating speed of the engine and the load oil injection quantity of the engine.
In the technical scheme, the control method of the power system further comprises the step of displaying the flow of the oil pump, the system pressure of the oil pump, the rotating speed of the engine and the load oil injection quantity of the engine, so that a user can know the real-time state of the power system conveniently.
In any of the above technical solutions, preferably, before the step of adjusting the rotation speed of the engine according to the comparison result, the method further includes obtaining a load torque of the engine and a maximum torque of the engine at the first rotation speed, and comparing the load torque with the maximum torque, where the comparison result includes a comparison result of the load torque and the maximum torque, and a comparison result of the load fuel injection quantity and the maximum fuel injection quantity.
In the technical scheme, the rotating speed of the engine is adjusted through two comparison results, the two comparison results comprise a comparison result of load torque and maximum torque and a comparison result of load fuel injection quantity and maximum fuel injection quantity, so that the speed of the engine is more suitable for working condition requirements, the engine works in an economic and fuel-saving and low-noise area, and the energy consumption of the whole engine is effectively reduced. The rotation speed of the engine can be adjusted according to different proportion factors of the fuel injection quantity comparison result and the torque comparison result.
In any of the above technical solutions, preferably, before the step of adjusting the rotation speed of the engine according to the comparison result, the method further includes obtaining a load power of the engine and a maximum power of the engine at the first rotation speed, and comparing the load power with the maximum power, where the comparison result includes a comparison result of a load fuel injection quantity and the maximum fuel injection quantity, and a comparison result of the load power and the maximum power.
According to the technical scheme, the rotating speed of the engine is adjusted through two comparison results, the two comparison results comprise a comparison result of load oil injection quantity and maximum oil injection quantity and a comparison result of load power and maximum power, the speed of the engine can be more suitable for working condition requirements, the engine can work in an area with economy, oil saving and low noise, and accordingly energy consumption of the whole engine is effectively reduced. The rotation speed of the engine can be adjusted according to different proportion factors of the fuel injection quantity comparison result and the power comparison result.
In any of the above technical solutions, preferably, the comparison result may also include a comparison result between the load torque and the maximum torque, a comparison result between the load power and the maximum power, and a comparison result between the load fuel injection quantity and the maximum fuel injection quantity, and the rotation speed of the engine may be adjusted according to different ratio factors of the torque comparison result, the power comparison result, and the fuel injection quantity comparison result.
Specifically, the step of adjusting the rotation speed of the engine according to the result of the comparison between the load torque and the maximum torque includes: when the load torque is less than the maximum torque, the engine is operated at a first speed; when the load torque is greater than or equal to the maximum torque, the rotational speed of the engine is adjusted. Preferably, the step of adjusting the rotation speed of the engine after the step when the load torque is greater than or equal to the maximum torque includes: detecting a duration in which the load torque is greater than or equal to the maximum torque; judging whether the duration is longer than a preset duration or not; when the duration is greater than or equal to the preset duration, adjusting the rotating speed of the engine; when the duration is less than the preset duration, the engine is operated at a first speed.
In addition, the step of adjusting the rotation speed of the engine according to the comparison result of the load fuel injection quantity and the maximum fuel injection quantity includes: when the load fuel injection quantity is smaller than the maximum fuel injection quantity, the engine runs at a first rotating speed; and when the load fuel injection quantity is greater than or equal to the maximum fuel injection quantity, regulating the rotating speed of the engine. Preferably, the step of adjusting the rotation speed of the engine after the step when the load fuel injection amount is greater than or equal to the maximum fuel injection amount includes: detecting the duration that the load fuel injection quantity is greater than or equal to the maximum fuel injection quantity; judging whether the duration is longer than a preset duration or not; when the duration is greater than or equal to the preset duration, adjusting the rotating speed of the engine; when the duration is less than the preset duration, the engine is operated at a first speed.
According to a second aspect of the present invention, there is provided a control system of a power system including an oil pump and an engine, characterized by comprising: an acquisition unit configured to acquire a first flow rate of an oil pump; and the control unit is configured to control the engine to operate at a first rotating speed matched with the first flow, is used for acquiring the load fuel injection quantity of the engine and the maximum fuel injection quantity of the engine at the first rotating speed, compares the load fuel injection quantity with the maximum fuel injection quantity, and is used for adjusting the rotating speed of the engine according to the comparison result.
The invention provides a control system of a power system, wherein the power system comprises an oil pump and an engine, and the control system of the power system comprises: the control unit is configured to control the engine to operate at a first rotating speed matched with the first flow, obtain the load fuel injection quantity of the engine and the maximum fuel injection quantity of the engine at the first rotating speed, further compare the load fuel injection quantity of the engine and the maximum fuel injection quantity of the engine, and then adjust the rotating speed of the engine according to the comparison result. The first flow rate of the oil pump is set by a user, that is, the user can set the flow rate of the oil pump through a flow rate input signal device (a button switch). The engine can be subjected to linear proportional stepless regulation according to the first flow of the oil pump, so that the rotating speed of the engine reaches a first rotating speed matched with the first flow, wherein the rotating speed of the engine can be increased along with the increase of the flow of the oil pump and can be reduced along with the reduction of the flow of the oil pump. According to the invention, the load fuel injection quantity and the maximum fuel injection quantity of the engine are compared, the rotating speed of the engine is adjusted according to the comparison result, the flow demand of a user on the fuel pump is comprehensively considered, and the lowest rotating speed and the highest rotating speed of the engine are limited, so that the engine works in an economic and fuel-saving and low-noise area, and the energy consumption of the whole engine is effectively reduced. The engine is a Controller Area Network (CAN) bus electric control engine, the power system CAN acquire the fuel injection quantity of the engine and the maximum fuel injection quantity allowed by an external characteristic curve under the current rotating speed in real time, and CAN automatically adjust to the optimal rotating speed according to load change and considering the energy consumption and noise of the engine, so that the adaptability of the engine to the working condition change is enhanced.
In addition, according to the control system of the power system in the above technical solution provided by the present invention, the following additional technical features may be further provided:
in the above technical solution, preferably, the control system of the power system includes: a detection unit configured to detect a system pressure of the oil pump; the control unit is also used for comparing the system pressure with a constant power regulation pressure point of the oil pump; and adjusting the flow of the oil pump according to the comparison result.
In this technical solution, a control system of a power system includes a detection unit configured to detect a system pressure of an oil pump. The control unit is also used for comparing the system pressure with a constant power regulation pressure point of the oil pump; and adjusting the flow of the oil pump according to the comparison result. The oil pump is an electronic constant power oil pump, and when the system pressure of the oil pump reaches a constant power regulation pressure point, the oil pump outputs constant power under set constant torque. The pressure point is adjusted by comparing the system pressure with the constant power of the oil pump, and then the flow of the oil pump is adjusted to ensure the normal operation of the power system and the equipment.
In any of the above technical solutions, preferably, the control unit is further configured to obtain a load torque of the engine and a maximum torque of the engine at the first rotation speed, and compare the load torque and the maximum torque; and/or the control unit is also used for obtaining the load power of the engine and the maximum power of the engine at the first rotating speed and comparing the load power with the maximum power; the comparison result comprises a comparison result of the load torque and the maximum torque, a comparison result of the load power and the maximum power and/or a comparison result of the load fuel injection quantity and the maximum fuel injection quantity.
In the technical scheme, the rotating speed of the engine can be adjusted according to the power comparison result, the torque comparison result and/or the fuel injection quantity comparison result. Preferably, the engine speed may be adjusted according to different duty factors of the power comparison result, the torque comparison result, and the fuel injection amount comparison result.
In any of the above solutions, preferably, the control system of the power system includes: and the display unit is configured to display the flow of the oil pump, the system pressure of the oil pump, the rotating speed of the engine and the load oil injection quantity of the engine.
In the technical scheme, a user can obtain parameter information such as the flow of an oil pump in a power system, the system pressure of the oil pump, the rotating speed of an engine, the load oil injection quantity of the engine and the like in real time through a display unit.
According to a third aspect of the present invention, there is provided a working machine comprising: the control system of the power system provided in any one of the above technical solutions.
The engineering machinery provided by the invention comprises the control system of the power system in any technical scheme, so that the engineering machinery has all the beneficial effects of the control system of the power system, and is not repeated herein.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic flow chart diagram illustrating a method of controlling a powertrain system in accordance with one embodiment of the present invention;
FIG. 2 is a schematic flow chart diagram illustrating a method of controlling a powertrain system in accordance with an exemplary embodiment of the present invention;
FIG. 3 shows a schematic flow diagram of a control system for a powertrain system according to one embodiment of the present invention.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
A control method of a power system, a control system of a power system, and a working machine according to some embodiments of the present invention will be described below with reference to fig. 1 to 3.
Embodiments of a first aspect of the invention provide a method of controlling a powertrain system.
Fig. 1 shows a schematic flow chart of a control method of a power system of one embodiment of the invention. As shown in fig. 1, the method includes:
s102, acquiring a first flow of an oil pump;
s104, controlling the engine to run at a first rotating speed matched with the first flow rate;
s106, acquiring the load oil injection quantity of the engine and the maximum oil injection quantity of the engine at a first rotating speed;
s108, comparing the load oil injection quantity with the maximum oil injection quantity;
and S110, adjusting the rotation speed of the engine according to the comparison result.
The invention provides a control method of a power system, wherein the power system comprises an oil pump and an engine, the control method of the power system comprises the steps of obtaining a first flow of the oil pump, controlling the engine to run at a first rotating speed matched with the first flow, obtaining a load oil injection quantity of the engine and a maximum oil injection quantity of the engine at the first rotating speed, further comparing the load oil injection quantity of the engine with the maximum oil injection quantity of the engine, and then adjusting the rotating speed of the engine according to a comparison result. The first flow rate of the oil pump is set by a user, that is, the user can set the flow rate of the oil pump through a flow rate input signal device (a button switch). The engine can be subjected to linear proportional stepless regulation according to the first flow of the oil pump, so that the rotating speed of the engine reaches a first rotating speed matched with the first flow, wherein the rotating speed of the engine can be increased along with the increase of the flow of the oil pump and can be reduced along with the reduction of the flow of the oil pump. According to the invention, the load fuel injection quantity and the maximum fuel injection quantity of the engine are compared, the rotating speed of the engine is adjusted according to the comparison result, the flow demand of a user on the fuel pump is comprehensively considered, and the lowest rotating speed and the highest rotating speed of the engine are limited, so that the engine works in an economic and fuel-saving and low-noise area, and the energy consumption of the whole engine is effectively reduced. The engine is a Controller Area Network (CAN) bus electric control engine, the power system CAN acquire the fuel injection quantity of the engine and the maximum fuel injection quantity allowed by an external characteristic curve at the current rotating speed in real time, and CAN automatically adjust to the optimal rotating speed according to load change and considering the energy consumption and noise of the engine, so that the adaptability of the engine to the working condition change is enhanced.
In one embodiment of the present invention, preferably, the step of adjusting the rotation speed of the engine according to the comparison result includes: when the load fuel injection quantity is smaller than the maximum fuel injection quantity, the engine runs at a first rotating speed; and when the load fuel injection quantity is greater than or equal to the maximum fuel injection quantity, regulating the rotating speed of the engine.
In the embodiment, when the load fuel injection quantity of the engine is smaller than the maximum fuel injection quantity, the rotating speed of the engine at the moment is indicated to meet the power requirement of the load, and the rotating speed of the engine is unchanged and still runs at the first rotating speed. When the load oil injection quantity of the engine is larger than or equal to the maximum oil injection quantity, the rotating speed of the engine cannot meet the power requirement of the load at the moment, and the rotating speed of the engine needs to be adjusted at the moment so as to meet the power requirement of the load and ensure the normal work of equipment with the power system.
In one embodiment of the present invention, preferably, after the step when the load fuel injection amount is greater than or equal to the maximum fuel injection amount, the step of adjusting the rotation speed of the engine includes: detecting the duration that the load fuel injection quantity is greater than or equal to the maximum fuel injection quantity; judging whether the duration is longer than a preset duration or not; when the duration is greater than or equal to the preset duration, adjusting the rotating speed of the engine; when the duration is less than the preset duration, the engine is operated at a first speed.
In this embodiment, after the step of adjusting the rotation speed of the engine after the step of adjusting the load fuel injection amount to be greater than or equal to the maximum fuel injection amount, the control method of the power system further includes detecting a duration of the load fuel injection amount to be greater than or equal to the maximum fuel injection amount, determining whether the duration is greater than a preset duration, and when the duration is greater than or equal to the preset duration, determining that the power output of the power system does not meet the requirement of the equipment, so that the rotation speed of the engine must be adjusted to obtain a larger power output, thereby meeting the power requirement of the equipment. And when the duration is less than the preset duration, the power demand of the equipment can be judged to be unstable, so that the rotating speed of the engine can be kept unchanged, and the duration that the load fuel injection quantity is greater than or equal to the maximum fuel injection quantity is continuously detected to judge whether the rotating speed of the engine needs to be adjusted so as to adjust the power output of the power system.
In one embodiment of the present invention, preferably, the control method of the power system further includes: detecting a system pressure of an oil pump; comparing the system pressure with a constant power regulation pressure point of the oil pump; and adjusting the flow of the oil pump according to the comparison result.
In this embodiment, the control method of the power system further includes: and when the load of the power system continues to increase, detecting the system pressure of the oil pump, comparing the detected system pressure with the constant power regulation pressure point of the oil pump, and regulating the flow of the oil pump according to the comparison result. The oil pump is an electronic constant power oil pump, and when the system pressure of the oil pump reaches a constant power regulation pressure point, the oil pump outputs constant power under set constant torque. The pressure point is adjusted by comparing the system pressure with the constant power of the oil pump, and then the flow of the oil pump is adjusted, so that the oil pump works under the constant power, the normal operation of an engine is ensured, and the normal operation of equipment is ensured.
In an embodiment of the present invention, preferably, the step of adjusting the flow rate of the oil pump according to the comparison result includes: when the system pressure is less than or equal to the constant power regulation pressure point, controlling the oil pump to operate at a first flow rate; when the system pressure is greater than the constant power regulated pressure point, the oil pump is controlled to operate at a second flow rate different from the first flow rate.
In this embodiment, the specific step of adjusting the flow rate of the oil pump according to the comparison result includes: when the system pressure is smaller than or equal to the constant power regulation pressure point, the oil pump is controlled to operate at the first flow rate, namely, the flow rate of the oil pump is still the first flow rate input by a user, and the flow rate of the oil pump is unchanged. When the system pressure is greater than the constant power regulation pressure point, the flow of the oil pump needs to be limited at the moment, namely the oil pump is controlled to operate at a second flow different from the first flow at the moment, so that the oil pump outputs constant power under constant torque, and normal operation of equipment is ensured.
In one embodiment of the present invention, preferably, the step of controlling the oil pump to operate at a second flow rate different from the first flow rate includes: acquiring a second flow rate according to the system pressure and the set torque of the oil pump, wherein the second flow rate is smaller than the first flow rate; the oil pump is controlled to operate at a second flow rate.
In this embodiment, the step of controlling the oil pump to operate at a second flow rate different from the first flow rate specifically includes obtaining the second flow rate according to the system pressure and the set torque of the oil pump, where the second flow rate is smaller than the first flow rate, where the system pressure and the set torque of the oil pump satisfy the formula: the flow rate of the oil pump is (the set torque of the oil pump is 2 pi)/the system pressure, that is, when the system pressure is increased, the flow rate of the oil pump is limited, so that the oil pump can output constant power under constant torque, and the normal operation of the equipment is ensured.
In one embodiment of the present invention, preferably, the step of controlling the engine to operate at a first rotational speed matched to the first flow rate comprises: calculating the matching relation between the flow of the oil pump and the rotating speed of the engine according to the universal characteristic curve of the engine and the external characteristic curve of the engine; calculating a first rotating speed according to the first flow and the matching relation; the engine is controlled to operate at a first speed.
In this embodiment, the step of controlling the engine to operate at a first rotational speed matching the first flow rate specifically comprises: and calculating the matching relation between the flow of the oil pump and the rotating speed of the engine according to the universal characteristic curve of the engine and the external characteristic curve of the engine, wherein the universal characteristic curve of the engine mainly reflects the oil consumption rate under different engine rotating speeds and load conditions. The external characteristic of the engine is an engine speed characteristic measured under the condition that the engine can generate the maximum power under the best working condition of the engine. The matching relation between the flow of the oil pump and the rotating speed of the engine can be obtained through the unique universal characteristic curve and the external characteristic curve of the engine, the first rotating speed of the engine is calculated according to the first flow of the oil pump and the matching relation, and the engine is controlled to run at the first rotating speed.
In one embodiment of the present invention, preferably, the step of adjusting the rotation speed of the engine includes: calculating a second rotating speed according to the universal characteristic curve of the engine and the load fuel injection quantity of the engine, wherein the second rotating speed is greater than the first rotating speed; and controlling the engine to run at the second rotating speed.
In this embodiment, the step of controlling the engine to operate at a second rotational speed different from the first rotational speed specifically includes: and calculating a second rotating speed according to the universal characteristic curve of the engine and the load fuel injection quantity of the engine, wherein the second rotating speed is greater than the first rotating speed, and controlling the engine to operate at the second rotating speed so as to meet the power requirement of equipment. When the load oil injection amount is larger than or equal to the maximum oil injection amount, namely the output power of the power system does not meet the power requirement of the equipment at the moment, the engine is controlled to operate at a second rotating speed different from the first rotating speed, and the power output of the engine is further improved.
In one embodiment of the present invention, preferably, the maximum fuel injection amount is a maximum fuel injection amount allowed by an external characteristic curve when the engine is operated at the first rotation speed; the set torque of the oil pump is the maximum torque of the oil pump.
In one embodiment of the present invention, preferably, the control method of the power system further includes: and displaying the flow of the oil pump, the system pressure of the oil pump, the rotating speed of the engine and the load oil injection quantity of the engine.
In this embodiment, the control method of the power system further includes displaying the flow rate of the oil pump, the system pressure of the oil pump, the rotation speed of the engine, and the load fuel injection amount of the engine, so that a user can know the real-time state of the power system conveniently.
Fig. 2 is a schematic flow chart showing a control method of the power system according to one embodiment of the present invention, and as shown in fig. 2, the control method includes:
s202, acquiring a first flow of an oil pump;
s204, controlling the engine to run at a first rotating speed matched with the first flow rate;
s206, acquiring the load oil injection quantity of the engine and the maximum oil injection quantity of the engine at a first rotating speed;
s208, comparing the load oil injection quantity with the maximum oil injection quantity;
s210, when the load oil injection quantity is smaller than the maximum oil injection quantity, the engine runs at a first rotating speed;
s212, when the load fuel injection quantity is larger than or equal to the maximum fuel injection quantity, detecting the duration of the load fuel injection quantity larger than or equal to the maximum fuel injection quantity;
s214, judging whether the duration is longer than a preset duration or not;
s216, if not, the engine runs at the first rotating speed;
s218, if yes, controlling the engine to operate at a second rotating speed different from the first rotating speed;
s220, detecting the system pressure of an oil pump;
s222, comparing the system pressure with a constant power regulation pressure point of the oil pump;
s224, when the system pressure is smaller than or equal to the constant power regulation pressure point, controlling the oil pump to operate at a first flow rate;
s226, when the system pressure is greater than the constant power regulation pressure point, controlling the oil pump to operate at a second flow rate different from the first flow rate;
and S228, displaying the flow of the oil pump, the system pressure of the oil pump, the rotating speed of the engine and the load oil injection quantity of the engine.
In any of the above technical solutions, preferably, before the step of adjusting the rotation speed of the engine according to the comparison result, the method further includes obtaining a load torque of the engine and a maximum torque of the engine at the first rotation speed, and comparing the load torque with the maximum torque, where the comparison result includes a comparison result of the load torque and the maximum torque, and a comparison result of the load fuel injection quantity and the maximum fuel injection quantity.
In the technical scheme, the rotating speed of the engine is adjusted through two comparison results, the two comparison results comprise a comparison result of load torque and maximum torque and a comparison result of load fuel injection quantity and maximum fuel injection quantity, so that the speed of the engine is more suitable for working condition requirements, the engine works in an economic and fuel-saving and low-noise area, and the energy consumption of the whole engine is effectively reduced. The rotation speed of the engine can be adjusted according to different proportion factors of the fuel injection quantity comparison result and the torque comparison result.
In any of the above technical solutions, preferably, before the step of adjusting the rotation speed of the engine according to the comparison result, the method further includes obtaining a load power of the engine and a maximum power of the engine at the first rotation speed, and comparing the load power with the maximum power, where the comparison result includes a comparison result of a load fuel injection quantity and the maximum fuel injection quantity, and a comparison result of the load power and the maximum power.
According to the technical scheme, the rotating speed of the engine is adjusted through two comparison results, the two comparison results comprise a comparison result of load oil injection quantity and maximum oil injection quantity and a comparison result of load power and maximum power, the speed of the engine can be more suitable for working condition requirements, the engine can work in an area with economy, oil saving and low noise, and accordingly energy consumption of the whole engine is effectively reduced. The rotation speed of the engine can be adjusted according to different proportion factors of the fuel injection quantity comparison result and the power comparison result.
In any of the above technical solutions, preferably, the comparison result may also include a comparison result between the load torque and the maximum torque, a comparison result between the load power and the maximum power, and a comparison result between the load fuel injection quantity and the maximum fuel injection quantity, and the rotation speed of the engine may be adjusted according to different ratio factors of the torque comparison result, the power comparison result, and the fuel injection quantity comparison result.
An embodiment of a second aspect of the present invention provides a control system 100 for a powertrain system.
FIG. 3 shows a schematic flow diagram of a control system for a powertrain system according to one embodiment of the present invention.
As shown in fig. 3, the system includes: an acquisition unit 102 configured to acquire a first flow rate of an oil pump; and the control unit 104 is configured to control the engine to operate at a first rotating speed matched with the first flow rate, obtain the load fuel injection quantity of the engine and the maximum fuel injection quantity of the engine at the first rotating speed, compare the load fuel injection quantity with the maximum fuel injection quantity, and adjust the rotating speed of the engine according to the comparison result.
The invention provides a control system of a power system, wherein the power system comprises an oil pump and an engine, and the control system of the power system comprises: the control unit 104 is configured to control the engine to operate at a first rotating speed matched with the first flow, obtain a load fuel injection quantity of the engine and a maximum fuel injection quantity of the engine at the first rotating speed, further compare the load fuel injection quantity of the engine and the maximum fuel injection quantity of the engine, and then adjust the rotating speed of the engine according to the comparison result. The first flow rate of the oil pump is set by a user, that is, the user can set the flow rate of the oil pump through a flow rate input signal device (a button switch). The engine can be subjected to linear proportional stepless regulation according to the first flow of the oil pump, so that the rotating speed of the engine reaches a first rotating speed matched with the first flow, wherein the rotating speed of the engine can be increased along with the increase of the flow of the oil pump and can be reduced along with the reduction of the flow of the oil pump. According to the invention, the load fuel injection quantity and the maximum fuel injection quantity of the engine are compared, the rotating speed of the engine is adjusted according to the comparison result, the flow demand of a user on the fuel pump is comprehensively considered, and the lowest rotating speed and the highest rotating speed of the engine are limited, so that the engine works in an economic and fuel-saving and low-noise area, and the energy consumption of the whole engine is effectively reduced. The engine is a Controller Area Network (CAN) bus electric control engine, the power system CAN acquire the fuel injection quantity of the engine and the maximum fuel injection quantity allowed by an external characteristic curve under the current rotating speed in real time, and CAN automatically adjust to the optimal rotating speed according to load change and considering the energy consumption and noise of the engine, so that the adaptability of the engine to the working condition change is enhanced.
In one embodiment of the present invention, preferably, the control system of the power system includes: a detection unit configured to detect a system pressure of the oil pump; the control unit is also used for comparing the system pressure with a constant power regulation pressure point of the oil pump; and adjusting the flow of the oil pump according to the comparison result.
In this embodiment, the control system of the power system includes a detection unit configured to detect a system pressure of the oil pump. The control unit is also used for comparing the system pressure with a constant power regulation pressure point of the oil pump; and adjusting the flow of the oil pump according to the comparison result. The oil pump is an electronic constant power oil pump, and when the system pressure of the oil pump reaches a constant power regulation pressure point, the oil pump outputs constant power under set constant torque. The pressure point is adjusted by comparing the system pressure with the constant power of the oil pump, and then the flow of the oil pump is adjusted to ensure the normal operation of the power system and the equipment.
In any of the above technical solutions, preferably, the control unit is further configured to obtain a load torque of the engine and a maximum torque of the engine at the first rotation speed, and compare the load torque and the maximum torque; and/or the control unit is further used for obtaining the load power of the engine and the maximum power of the engine at the first rotating speed and comparing the load power with the maximum power; the comparison result comprises a comparison result of the load torque and the maximum torque, a comparison result of the load power and the maximum power and/or a comparison result of the load fuel injection quantity and the maximum fuel injection quantity.
In the technical scheme, the rotating speed of the engine can be adjusted according to the power comparison result, the torque comparison result and/or the fuel injection quantity comparison result. Preferably, the engine speed may be adjusted according to different duty factors of the power comparison result, the torque comparison result, and the fuel injection amount comparison result.
In one embodiment of the present invention, preferably, the control system of the power system includes: and the display unit is configured to display the flow of the oil pump, the system pressure of the oil pump, the rotating speed of the engine and the load oil injection quantity of the engine.
In the embodiment, a user can obtain parameter information such as the flow of an oil pump in a power system, the system pressure of the oil pump, the rotating speed of an engine, the load oil injection quantity of the engine and the like in real time through a display unit.
According to a third aspect of the present invention, there is provided a working machine comprising: a control system for a powertrain system as provided in any of the above embodiments.
The engineering machinery provided by the invention comprises the control system of the power system in any embodiment, so that the engineering machinery has all the beneficial effects of the control system of the power system, and the details are not repeated. In the present invention, the term "plurality" means two or more unless explicitly defined otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (13)
1. A control method of a power system including an oil pump and an engine, characterized by comprising:
acquiring a first flow rate of the oil pump;
controlling the engine to operate at a first rotational speed that matches the first flow rate;
acquiring the load fuel injection quantity of the engine and the maximum fuel injection quantity of the engine at the first rotating speed;
comparing the load fuel injection quantity with the maximum fuel injection quantity;
adjusting the rotation speed of the engine according to the comparison result;
when the load fuel injection quantity is larger than or equal to the maximum fuel injection quantity, adjusting the rotating speed of the engine;
after the step when the load fuel injection amount is greater than or equal to the maximum fuel injection amount, the step of adjusting the rotation speed of the engine includes:
detecting the duration that the load fuel injection quantity is greater than or equal to the maximum fuel injection quantity;
judging whether the duration is longer than a preset duration or not;
when the duration is greater than or equal to the preset duration, adjusting the rotating speed of the engine;
when the duration is less than the preset duration, the engine is operated at the first speed.
2. The control method of a powertrain system according to claim 1, wherein the step of adjusting the rotational speed of the engine according to the comparison result further comprises:
when the load fuel injection amount is less than the maximum fuel injection amount, the engine is operated at the first rotational speed.
3. The control method of the power system according to claim 1 or 2, characterized by further comprising:
detecting a system pressure of the oil pump;
comparing the system pressure to a constant power regulated pressure point of the oil pump;
and adjusting the flow of the oil pump according to the comparison result.
4. The control method of the powertrain system according to claim 3, wherein the step of adjusting the flow rate of the oil pump according to the comparison result includes:
when the system pressure is less than or equal to the constant power regulation pressure point, controlling the oil pump to operate at the first flow rate;
and when the system pressure is greater than the constant power regulation pressure point, controlling the oil pump to operate at a second flow rate different from the first flow rate.
5. The control method of a powertrain according to claim 4, wherein the step of controlling the oil pump to operate at a second flow rate different from the first flow rate includes:
acquiring the second flow according to the system pressure and the set torque of the oil pump, wherein the second flow is smaller than the first flow;
controlling the oil pump to operate at the second flow rate.
6. The control method of a powertrain according to claim 1 or 2, wherein the step of controlling the engine to operate at a first rotational speed that matches the first flow rate includes:
calculating the matching relation between the flow of the oil pump and the rotating speed of the engine according to the universal characteristic curve of the engine and the external characteristic curve of the engine;
calculating the first rotating speed according to the first flow and the matching relation;
controlling the engine to operate at the first speed.
7. The control method of a powertrain according to claim 1 or 2, wherein the step of adjusting the rotational speed of the engine includes:
calculating a second rotating speed according to the universal characteristic curve of the engine and the load fuel injection quantity of the engine, wherein the second rotating speed is greater than the first rotating speed;
controlling the engine to operate at the second speed.
8. The powertrain control method according to claim 4, wherein prior to the step of adjusting the rotational speed of the engine based on the comparison result, the powertrain control method further comprises:
acquiring a load torque of the engine and a maximum torque of the engine at the first rotating speed, and comparing the load torque with the maximum torque;
wherein the comparison result comprises a comparison result of the load fuel injection quantity and the maximum fuel injection quantity, and a comparison result of the load torque and the maximum torque.
9. The control method of a powertrain system according to claim 4, characterized in that before the step of adjusting the rotational speed of the engine according to the comparison result, the control method of a powertrain system further comprises:
acquiring load power of the engine and maximum power of the engine at the first rotating speed, and comparing the load power with the maximum power;
wherein the comparison result comprises a comparison result of the load fuel injection quantity and the maximum fuel injection quantity, and a comparison result of the load power and the maximum power.
10. A control system of a power system including an oil pump and an engine, characterized by comprising:
an acquisition unit configured to acquire a first flow rate of the oil pump;
a control unit configured to control the engine to operate at a first rotational speed matching the first flow rate,
the engine speed control device is used for acquiring the load oil injection quantity of the engine and the maximum oil injection quantity of the engine at the first rotating speed, comparing the load oil injection quantity with the maximum oil injection quantity and adjusting the rotating speed of the engine according to the comparison result;
when the load fuel injection quantity is larger than or equal to the maximum fuel injection quantity, adjusting the rotating speed of the engine;
after the step when the load fuel injection amount is greater than or equal to the maximum fuel injection amount, the step of adjusting the rotation speed of the engine includes: detecting the duration that the load fuel injection quantity is greater than or equal to the maximum fuel injection quantity; judging whether the duration is longer than a preset duration or not; when the duration is greater than or equal to the preset duration, adjusting the rotating speed of the engine; when the duration is less than the preset duration, the engine is operated at the first speed.
11. The powertrain system control system of claim 10, comprising:
a detection unit configured to detect a system pressure of the oil pump;
the control unit is further configured to compare the system pressure to a constant power regulated pressure point of the oil pump;
and adjusting the flow of the oil pump according to the comparison result.
12. The control system of a powertrain system of claim 11,
the control unit is further used for obtaining a load torque of the engine and a maximum torque of the engine at the first rotating speed, and comparing the load torque with the maximum torque; and/or
The control unit is further used for obtaining the load power of the engine and the maximum power of the engine at the first rotating speed, and comparing the load power with the maximum power;
wherein the comparison result comprises a comparison result of the load fuel injection quantity and the maximum fuel injection quantity, a comparison result of the load torque and the maximum torque, and/or a comparison result of the load power and the power.
13. A work machine, comprising: a control system for a powered system according to any one of claims 10 to 12.
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| CN201811519848.XA CN109630298B (en) | 2018-12-12 | 2018-12-12 | Control method and control system of power system and engineering machinery |
| PCT/CN2019/093869 WO2020119084A1 (en) | 2018-12-12 | 2019-06-28 | Power system control method and control system, and engineering machinery |
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| CN109630298B (en) * | 2018-12-12 | 2021-05-07 | 三一汽车制造有限公司 | Control method and control system of power system and engineering machinery |
| CN113713533A (en) * | 2021-08-04 | 2021-11-30 | 三一汽车制造有限公司 | Control method and device of air filtering system, vehicle and storage medium |
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