A control system for hydraulic transmission

Abstract

The invention discloses a hydraulic transmission control system, comprising: a hydraulic control system, a load pressure acquisition module, a load speed acquisition module, a speed calculation module, an operating speed input module, a displacement calculation module, a speed control module, and a displacement control module; the hydraulic control system comprises: a hydraulic pump control system and a hydraulic motor control system; the output ends of the load pressure acquisition module and the load speed acquisition module are loaded into the speed calculation module, the speed calculation module acquires signals through the load pressure acquisition module and the load speed acquisition module, and the speed calculation module calculates the load power, and obtains the minimum speed of the hydraulic motor according to the load power; the invention controls the actual displacement required by the hydraulic pump and the hydraulic motor through the displacement control module, thereby effectively saving energy and reducing emissions, saving resources, and solving the problem of unsatisfactory energy saving and consumption reduction and waste of resources caused by manual control operation errors.

Description

Technical Field

[0001] The present invention relates to the technical field of engineering machinery, in particular to a hydraulic transmission control system. Background Art

[0002] Hydraulic transmission control is a control method frequently used in industry. It uses hydraulics to complete the process of energy transfer. Due to the flexibility and convenience of hydraulic transmission control, hydraulic control has received widespread attention in industry. Hydraulic transmission is a discipline that studies the use of pressurized fluid as an energy medium to achieve various mechanical and automatic controls.

[0003] The power transmission methods of the hydraulic transmission system are divided into the following transmission methods. One is that the hydraulic pump is powered by the engine, and the hydraulic pump transmits power to the hydraulic motor; the hydraulic motor is driven by the hydraulic pump, and the speed of the hydraulic motor is changed by the reduction gear box and then passes through the mechanical transmission mechanism to the power transmission device.

[0004] The above control methods are all manual control of the transmission system. Under different pressures, the control device is manually operated based on past experience to control the gear position and thus control fuel consumption.

[0005] The manual operation control device is manually controlled. It matches the hydraulic system manually according to the pressure, which is prone to errors. This error will cause the judgment of the hydraulic system and the pressure load to be non-standard, and it cannot effectively save energy and resources.

[0006] Existing technologies can no longer meet people’s needs at this stage. Based on the current situation, it is urgent to reform existing technologies. Summary of the invention

[0007] The object of the present invention is to provide a control system for hydraulic transmission to solve the problems raised in the above background technology.

[0008] On the one hand, the present invention provides the following technical solution: a hydraulic transmission control device, comprising: a hydraulic control system, a load pressure acquisition module, a load speed acquisition module, a speed calculation module, a running speed input module, a displacement calculation module, a speed control module, and a displacement control module;

[0009] The hydraulic control system includes: a hydraulic pump control system and a hydraulic motor control system;

[0010] The output ends of the load pressure acquisition module and the load speed acquisition module are loaded into the speed calculation module, the speed calculation module acquires signals through the load pressure acquisition module and the load speed acquisition module, calculates the load power according to the power calculation formula, and obtains the minimum speed of the engine according to the load power;

[0011] The load pressure acquisition module includes: a load signal collection module and a load pressure transmission module, one end of the load signal collection module is coupled to the hydraulic motor control system to obtain the pressure of the hydraulic motor when it is running, the other end of the load signal collection module is coupled to the load pressure transmission module, and the load pressure transmission module is loaded into the speed calculation module in the speed acquisition module, and the load pressure transmission module transmits the pressure collected by the load signal collection module to the speed calculation module;

[0012] The load speed acquisition module includes: a speed signal collection module and a speed transmission module, one end of the speed signal collection module is coupled to the hydraulic motor control system to obtain the speed of the hydraulic motor when it is running, the other end of the speed signal collection module is coupled to the speed transmission module, and the speed transmission module is loaded into the speed calculation module in the speed acquisition module, and the speed transmission module transmits the speed collected by the speed signal collection module to the speed calculation module;

[0013] The output end of the speed calculation module is loaded into the speed control module, and the speed control module converts the minimum speed of the hydraulic motor calculated by the speed calculation module into the minimum speed of the engine to control the actual speed of the engine;

[0014] The speed calculation module is coupled to the running speed input module, and the running speed input module is coupled to the displacement calculation module; the running speed input module transmits the minimum engine speed obtained by the speed calculation module to the displacement calculation module; the displacement calculation module obtains the required displacement of the hydraulic pump and the hydraulic motor according to the displacement obtained by the displacement calculation formula based on the running speed input by the running speed input module;

[0015] The displacement calculation module is coupled to the displacement control module, and the displacement control module is coupled to the hydraulic pump control system and the hydraulic motor control system. The hydraulic pump control system and the hydraulic motor control system respectively control the actual displacement required by the hydraulic pump and the hydraulic motor through the displacement control module according to the displacement required by the hydraulic pump and the hydraulic motor calculated by the displacement calculation module, thereby effectively saving energy and reducing emissions, saving resources, and solving the problem of unsatisfactory energy saving and consumption reduction and waste of resources caused by manual control operation errors.

[0016] On the other hand, the present invention provides the following technical solution: a hydraulic transmission control method, wherein the method specifically comprises the following steps:

[0017] Step S1, obtaining the speed and pressure of the hydraulic motor through the load speed obtaining module and the load pressure obtaining module, and calculating the load power, and obtaining the minimum speed of the engine through the load power calculation;

[0018] Step S2, calculating the operating speed of the operating mechanism according to the minimum speed of the engine, and calculating the required displacement of the hydraulic pump and the hydraulic motor according to the operating speed;

[0019] Step S3, controlling the actual speed of the engine according to the minimum speed of the engine through the speed control module;

[0020] Step S4 controls the output of the actual displacement according to the required displacement of the hydraulic pump and the hydraulic motor through the displacement control module. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the hydraulic transmission control device of the present invention;

[0022] Figure 2 It is a schematic flow chart of the hydraulic transmission control method of the present invention. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in the field of the present invention without creative work are within the scope of protection of the present invention.

[0024] refer to Figure 1 On the one hand, the present invention provides a hydraulic transmission control device for solving the problem of unsatisfactory energy saving and consumption reduction and waste of resources caused by manual control operation errors.

[0025] It includes: hydraulic control system, load pressure acquisition module, load speed acquisition module, speed calculation module, running speed input module, displacement calculation module, speed control module and displacement control module;

[0026] The hydraulic control system includes: a hydraulic pump control system and a hydraulic motor control system; the hydraulic pump control system and the hydraulic motor control system are both provided with a flow control valve and a speed controller, the hydraulic motor control system matches the engine speed according to the running speed of the running mechanism through the flow control valve and the speed controller, thereby obtaining a corresponding speed signal, and then obtaining the speed of the signal through a load speed acquisition module;

[0027] The output ends of the load pressure acquisition module and the load speed acquisition module are loaded into the speed calculation module, the speed calculation module acquires signals through the load pressure acquisition module and the load speed acquisition module, calculates the load power according to the power calculation formula, and obtains the minimum speed of the hydraulic motor according to the load power;

[0028] The load pressure acquisition module includes: a load signal collection module and a load pressure transmission module, one end of the load signal collection module is coupled to the hydraulic motor control system to obtain the pressure of the hydraulic motor when it is running, the other end of the load signal collection module is coupled to the load pressure transmission module, and the load pressure transmission module is loaded into the speed calculation module in the speed acquisition module, and the load pressure transmission module transmits the pressure collected by the load signal collection module to the speed calculation module;

[0029] The load speed acquisition module includes: a speed signal collection module and a speed transmission module. One end of the speed signal collection module is coupled to the hydraulic motor control system to obtain the speed of the hydraulic motor during operation. The other end of the speed signal collection module is coupled to the speed transmission module, and the speed transmission module is loaded into the speed calculation module in the speed acquisition module. The speed transmission module transmits the speed collected by the speed signal collection module to the speed calculation module.

[0030] In an embodiment, the load power calculation formula is:

[0031] P=F×V

[0032] Wherein, F is the working pressure of the hydraulic motor; V is the speed of the hydraulic motor;

[0033] The load power P of the hydraulic motor is related to the working pressure F of the hydraulic motor and the speed V of the hydraulic motor. The power P of the hydraulic motor is controlled by controlling the working pressure F of the hydraulic motor and the speed V of the hydraulic motor. Specifically, the load signal collection module and the load pressure transmission module obtain the load pressure of the hydraulic motor by collecting from the hydraulic control system, and transmit the pressure signal to the speed calculation module; the speed signal collection module and the speed transmission module obtain the speed of the hydraulic motor by collecting the speed signal from the hydraulic control system, and also transmit the speed signal to the speed calculation module; the speed calculation module calculates the speed of the hydraulic motor during operation by calculating the received speed signal and pressure signal, so as to obtain the load power P of the hydraulic motor;

[0034] In the embodiment, the calculated load power P of the hydraulic motor is transmitted to the operation center of the speed calculation module in the form of a signal, and the pressure F of the hydraulic motor is transmitted to the speed calculation module through the load pressure transmission module. After data analysis and calculation of the pre-stored formula P=F×V', the minimum speed V' of the hydraulic motor can be obtained;

[0035] The output end of the speed calculation module is loaded into the speed control module, and the speed control module converts the minimum speed of the hydraulic motor calculated by the speed calculation module into the minimum speed of the engine to control the actual speed of the engine; specifically, the speed control module controls the reduction box of the operating mechanism, and adjusts it in real time according to the minimum speed signal of the engine to the most suitable speed, so that the hydraulic control system matches the best speed; in order to avoid unnecessary energy consumption of the engine, under the condition of satisfying the load power P, the operating speed of the operating mechanism is reduced as much as possible, that is, the speed of the engine is reduced, and by adjusting the speed of the engine, the output power of the engine is made as small as possible under the action of satisfying the pressure, thereby reducing energy consumption, and adjusting the engine in real time to the minimum speed that meets the power requirement, so as to improve energy consumption and save resources.

[0036] The speed calculation module is coupled to the running speed input module, and after calculation, the engine speed is obtained to control the running speed of the mechanism. The running speed input module is coupled to the displacement calculation module, and the running speed input module transmits the running speed of the mechanism to the displacement calculation module; the displacement calculation module obtains the required displacement of the hydraulic pump and the hydraulic motor according to the displacement obtained by the displacement calculation formula according to the running speed input by the running speed input module;

[0037] In the embodiment, Va×V 0 =Vb×V1; where Va is the displacement of the hydraulic motor; V 0 is the minimum speed of the hydraulic motor; Vb is the displacement of the hydraulic pump; V1 is the speed of the motor;

[0038] From the formula, we can know that the displacement of the hydraulic motor and the speed of the hydraulic motor are related to the displacement of the hydraulic pump and the speed of the motor. Therefore, to control the displacement of the hydraulic motor, we must control the speed of the hydraulic motor, and to control the displacement of the pump, we must control the speed of the motor.

[0039] When the equipment runs at speed V>V0, the displacement percentage required by the hydraulic pump and hydraulic motor is 100%. At this running speed, the displacement required by the hydraulic motor is:

[0040]

[0041] When the equipment runs at a speed V<V0, the required displacement of the hydraulic pump is 100%. At this running speed, the required displacement of the hydraulic pump is:

[0042]

[0043] Among them, V is the speed of the whole equipment; V0 is the speed of the mechanism corresponding to 100% displacement of the hydraulic pump and hydraulic motor at the lowest speed of the mechanism under the minimum power determination; r is the radius of the driving mechanism of the mechanism; V1 is the rated displacement of the hydraulic pump; n1 is the speed of the engine; ia is the reduction ratio of the hydraulic motor to the driving mechanism; η1 is the volumetric efficiency of the hydraulic transmission control system;

[0044] The displacement calculation module is coupled to the displacement control module, and the displacement control module is coupled to the hydraulic pump control system and the hydraulic motor control system. The hydraulic pump control system and the hydraulic motor control system respectively calculate the required displacement of the hydraulic pump and the hydraulic motor by the displacement calculation module. It only needs to input instructions to the displacement control module, make real-time adjustments according to the required displacement of the hydraulic pump and the hydraulic motor, control the actual displacement of the hydraulic pump and the hydraulic motor, and make corresponding adjustments, thereby effectively saving energy and reducing emissions and saving resources.

[0045] On the one hand, the present invention realizes that while meeting the load power required by the operating mechanism, the engine can be controlled to work under the minimum speed condition, so that the output power of the engine is minimized, which can effectively solve the energy consumption; on the other hand, according to the operating speed of the operating mechanism, the displacement of the hydraulic motor system or the hydraulic pump system is calculated, and then the actual displacement of the hydraulic pump and the hydraulic motor is controlled through the adjustment of the displacement control module, so that the displacement of the hydraulic pump and the displacement of the hydraulic motor are reasonably adjusted, so that the displacement of the hydraulic pump and the displacement of the hydraulic motor are within the most appropriate range, achieving the purpose of energy saving and consumption reduction. The control system of the present invention replaces the traditional manual control system in the past, and adjusts the speed and flow rate in the form of feedback adjustment, which is more precise and intelligent.

[0046] refer to Figure 2 On the other hand, based on the hydraulic transmission control, the present invention provides a hydraulic transmission control method for adjusting the engine speed and the displacement of the hydraulic pump and the hydraulic motor based on the hydraulic transmission control; the specific steps of the method include:

[0047] Step S1, obtaining the speed and pressure of the hydraulic motor through the load speed obtaining module and the load pressure obtaining module, and calculating the load power, and obtaining the minimum speed of the engine through the load power calculation;

[0048] Step S2, calculating the operating speed of the operating mechanism (such as a ship or yacht) according to the minimum speed of the engine, and calculating the required displacement of the hydraulic pump and the hydraulic motor according to the operating speed;

[0049] Step S3, controlling the actual speed of the engine according to the minimum speed of the engine through the speed control module;

[0050] Step S4 controls the output of the actual displacement according to the required displacement of the hydraulic pump and the hydraulic motor through the displacement control module.

[0051] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A hydraulic transmission control device, characterized in that: include: Hydraulic control system, load pressure acquisition module, load speed acquisition module, speed calculation module, running speed input module, displacement calculation module, speed control module, displacement control module; The hydraulic control system includes: a hydraulic pump control system and a hydraulic motor control system; The output ends of the load pressure acquisition module and the load speed acquisition module are loaded into the speed calculation module, the speed calculation module acquires signals through the load pressure acquisition module and the load speed acquisition module, and the speed calculation module calculates the load power, and obtains the minimum speed of the hydraulic motor according to the load power; The output end of the speed calculation module is loaded into the speed control module, and the speed control module converts the minimum speed of the hydraulic motor calculated by the speed calculation module into the minimum speed of the engine to control the actual speed of the engine; The rotation speed calculation module is coupled to the operating speed input module, and the operating speed input module is coupled to the displacement calculation module; the operating speed input module inputs the operating speed value of the mechanism to the displacement calculation module; the displacement calculation module calculates the required displacement of the hydraulic pump and the hydraulic motor according to the operating speed input by the operating speed input module; The displacement calculation module is coupled to the displacement control module, and the displacement control module is coupled to the hydraulic pump control system and the hydraulic motor control system. The hydraulic pump control system and the hydraulic motor control system respectively control the actual displacement required by the hydraulic pump and the hydraulic motor through the displacement control module according to the displacement required by the hydraulic pump and the hydraulic motor calculated by the displacement calculation module.

2. The hydraulic transmission control device according to claim 1, characterized in that: The load pressure acquisition module includes: a load signal collection module and a load pressure transmission module; one end of the load signal collection module is coupled to the hydraulic motor control system to obtain the pressure when the hydraulic motor is running; the other end of the load signal collection module is coupled to the load pressure transmission module, and the load pressure transmission module is loaded into the speed calculation module in the speed acquisition module, and the load pressure transmission module transmits the pressure collected by the load signal collection module to the speed calculation module.

3. The hydraulic transmission control device according to claim 1, characterized in that: The load speed acquisition module includes: a speed signal collection module and a speed transmission module; one end of the speed signal collection module is coupled to the hydraulic motor control system to obtain the speed of the hydraulic motor when it is running, and the other end of the speed signal collection module is coupled to the speed transmission module, and the speed transmission module is loaded into the speed calculation module in the speed acquisition module, and the speed transmission module transmits the speed collected by the speed signal collection module to the speed calculation module.

4. The hydraulic transmission control device according to claim 1, characterized in that: The speed control module is adjusted in real time according to the minimum speed signal of the engine, and reduces the running speed of the operating mechanism under the condition of satisfying the load power P, so that the output power of the engine becomes smaller under the effect of satisfying the pressure.

5. The hydraulic transmission control device according to claim 1, characterized in that: The displacement calculation formula of the hydraulic motor and hydraulic pump is: Va×V0=Vb×V1; where Va is the displacement of the hydraulic motor; V0 is the minimum speed of the hydraulic motor; Vb is the displacement of the hydraulic pump; V1 is the speed of the motor; When the equipment runs at speed V>V0, the displacement percentage required by the hydraulic pump and hydraulic motor is 100%, and the displacement required by the hydraulic motor is: When the equipment runs at a speed V<V0, the required displacement of the hydraulic pump is 100%, and the required displacement of the hydraulic pump is: Among them, V is the operating speed of the whole equipment; V0 is the speed of the mechanism corresponding to 100% of the displacement of the hydraulic pump and hydraulic motor at the lowest speed of the mechanism determined by the minimum power; r is the radius of the driving mechanism of the mechanism; V1 is the rated displacement of the hydraulic pump; n1 is the speed of the engine; ia is the reduction ratio of the hydraulic motor to the driving mechanism; η1 is the volumetric efficiency of the hydraulic transmission control system.

6. The hydraulic transmission control device according to claim 1, characterized in that: The hydraulic pump control system and the hydraulic motor control system respectively make real-time adjustments according to the required displacements of the hydraulic pump and the hydraulic motor calculated by the displacement calculation module, and control the actual displacements of the hydraulic pump and the hydraulic motor by inputting instructions to the displacement control module.

7. A hydraulic transmission control method based on the device according to any one of claims 1 to 6, characterized in that: The method specifically comprises the following steps: Step S1, obtaining the speed and pressure of the hydraulic motor through the load speed obtaining module and the load pressure obtaining module, and calculating the load power, and obtaining the minimum speed of the engine through the load power calculation; Step S2, calculating the operating speed of the operating mechanism according to the minimum speed of the engine, and calculating the required displacement of the hydraulic pump and the hydraulic motor according to the operating speed; Step S3, controlling the actual speed of the engine according to the minimum speed of the engine through the speed control module; Step S4 controls the output of the actual displacement according to the required displacement of the hydraulic pump and the hydraulic motor through the displacement control module.

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